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154 Cards in this Set
- Front
- Back
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The work of scientists begins with
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careful observation
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A controlled experiment allows the scientist to isolate and test
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a single variable
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The basic unit of mass in SI is the
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gram
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Which of the following makes up a molecule of water
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two atoms of hydrogen and one atom of oxygen
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Which of the following statements about a compound is true
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The physial and chemical properties of a compound are usually very different from those of the elements from which it is formed
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The most abundant compond in most living things is
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water
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In a chemcial reactions, atoms are
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rearranged
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The variable that causes a change in an experiment but is not changed in the process is called
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the manipulated variable
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Descriptive information gathered from completing an experiment is classified as
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Qualitative
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Sue created a table to record the numberical information from her experiment. What kind of data does this represent?
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Quantitative
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A hypothesis that has been proven to give the same results over and over again is called a
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Law
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The unit of the metric system used to measure distances is
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meter
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The prefix hecto that is used in the metric refers to the number
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100
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The metric system is based upon the number
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10
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Which metric unit would be most appropriate to measure size of an ant?
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millimeter
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The work of scientists begins with
|
careful observation
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|
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A controlled experiment allows the scientist to isolate and test
|
a single variable
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|
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The basic unit of mass in SI is the
|
gram
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Which of the following makes up a molecule of water
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two atoms of hydrogen and one atom of oxygen
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Which of the following statements about a compound is true
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The physial and chemical properties of a compound are usually very different from those of the elements from which it is formed
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The most abundant compond in most living things is
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water
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IN a chemcial reactions, atoms are
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rearranged
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The variable that causes a change in an experiment but is not changed in the process is called
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the manipulated variable
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Descriptive information gathered from completing an experiment is classified as
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a theory
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Sue created a table to record the numberical information from her experiment. What kind of data does this represent?
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Qualitative
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A hypothesis that has been proven to give the same results over and over again is called a
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Law
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The unit of the metric system used to measure distances is
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meter
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The prefix hecto that is used in the metric refers to the number
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100
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The metric system is based upon the number
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10
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Which metric unit would be most appropriate to measure size of an ant?
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millimeter
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The difference between mass and weight is
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mass depends on gravity
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What is the metric unit used to measure a liquid?
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liter
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Which of the following is not a fundamental building block of the atom?
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photon
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Every known atom contains
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protons and neutrons
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The atomic weight of a substance depends on the number of
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protons and neutrons
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The correct symbol for potassium
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K
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What is the correct element for the symbol Na
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Sodium
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Name the subatomic particle that does not have a charge
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neutron
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In a neutral atom there are the
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same number of protons and electrons
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When two element equally share an electron
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covalent bond
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The difference between mass and weight is
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mass depends on gravity
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When one element takes an electron from another element
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Ionic bond
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What is the metric unit used to measure a liquid?
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liter
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An element has a mass number of 195 and an atomic number of 78, how many neutrons does it have?
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117 neturons
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Which of the following is not a fundamental building block of the atom?
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photon
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How many electrons does it have?
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78
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Every known atom contains
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protons and neutrons
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Rubidium has an atomic number of 37 and 48 neturons. How many electrons does it have?
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37
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The atomic weight of a substance depends on the number of
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protons and neutrons
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The definition of quantitative is
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informatin represented by numbers
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The correct symbol for potassium
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K
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What is the correct element for the symbol Na
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Sodium
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Name the subatomic particle that does not have a charge
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neutron
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In a neutral atom there are the
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same number of protons and electrons
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When two element equally share an electron
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covalent bond
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When one element takes an electron from another element
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Ionic bond
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An element has a mass number of 195 and an atomic number of 78, how many neutrons does it have?
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117 neturons
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How many electrons does it have?
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78
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Rubidium has an atomic number of 37 and 48 neturons. How many electrons does it have?
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37
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The definition of quantitative is
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informatin represented by numbers
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The difference between mass and weight is
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mass depends on gravity
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What is the metric unit used to measure a liquid?
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liter
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Which of the following is not a fundamental building block of the atom?
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photon
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Every known atom contains
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protons and neutrons
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The atomic weight of a substance depends on the number of
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protons and neutrons
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The correct symbol for potassium
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K
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What is the correct element for the symbol Na
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Sodium
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Name the subatomic particle that does not have a charge
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neutron
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In a neutral atom there are the
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same number of protons and electrons
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When two element equally share an electron
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covalent bond
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When one element takes an electron from another element
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Ionic bond
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An element has a mass number of 195 and an atomic number of 78, how many neutrons does it have?
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117 neturons
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How many electrons does it have?
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78
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Rubidium has an atomic number of 37 and 48 neturons. How many electrons does it have?
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37
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The definition of quantitative is
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informatin represented by numbers
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The difference between mass and weight is
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mass depends on gravity
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What is the metric unit used to measure a liquid?
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liter
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Which of the following is not a fundamental building block of the atom?
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photon
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Every known atom contains
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protons and neutrons
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The atomic weight of a substance depends on the number of
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protons and neutrons
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The correct symbol for potassium
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K
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What is the correct element for the symbol Na
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Sodium
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Name the subatomic particle that does not have a charge
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neutron
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In a neutral atom there are the
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same number of protons and electrons
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When two element equally share an electron
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covalent bond
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When one element takes an electron from another element
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Ionic bond
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An element has a mass number of 195 and an atomic number of 78, how many neutrons does it have?
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117 neturons
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How many electrons does it have?
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78
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Rubidium has an atomic number of 37 and 48 neturons. How many electrons does it have?
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37
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The definition of quantitative is
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informatin represented by numbers
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What is the mass of Rubidium?
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85
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An example of qualitative information
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a black cat
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Which answers represents quantitative?
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Renee has an average of 77% in math class and Renee has an average of 82% in science class.
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What kind of information does the following sentence show? The two brown dogs followed the gray kitten 100 meters down the street.
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Quantitative and Qualitative
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For a hypothesis to have value, it must be tested
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True
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The variable that is deliberately changed is called the responding variable
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False manipulated
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The metric system is based on multiples of 100
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False 10
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The base unit of matter is the molecule.
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False atom
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A subatnace made up of only one kind of atom is an element
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True
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The symbol for the isotope oxygen-18 is written O18
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False 18 O
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Scientists show the composition f compounds by a kind of shorthand known as a chemical formula
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True
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When sugar is dissolved in water, the sugar and water are chemically combined
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False physically
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The substances that are present wehn a chemical reaction begins are the products.
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False reactants
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When an atom loses an electron, it has a positive charge
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True
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PE is the abbreviation for potential energy
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True
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Water heating and changing into steam is an example of a chemical change
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False
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Iron rusting is an example of a chemical change
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True
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Fe is the symbol for Iron
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True
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The responding variable stays the same throughout the experiment
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False
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The sense of taste is used in experiment all the time
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False
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The symbol for Calcium is C
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False Ca
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Electrons in an atom are where electricy comes from
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True
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Bruing a piece of paper is an example of a physical change
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True
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A chemcial change has occurred if a new substance is formed
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True
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The symbol for N represents Nickel
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False
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Martin Luther Kings Jrs. birthdya is the next school holiday
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True
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Electrons are found in the nucleus
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False
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I am happy to get to the last question of the final
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True
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Why are atoms considered neutral
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If they are in a neutral state, they have the same number of protons and electrons which cancels out any charge
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What is a mass number
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The sum of the protons and neutrons in the nucleus of the atom
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What is a molecule?
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A molecule is the smallest unit of most chemical compounds
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What are the main types of chemical bonds
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Covalent bonds-where electrons are shared between atoms
Ionic bonds where one atom takes an electron from another |
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Where would you most likely find shared electrons in a water molecule?
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Near the oxygen atom of the water molecule
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What is a mixture?
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A mixture is a material made up of two or more elements or compounds that are physically mixed together, not chemically.
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Use the terms solvent and solute to describe how to prepare a salt solution.
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The salt is the solute and the water is the solvent
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Based on its pH value, is sea water more acidic or less acidic than pure water?
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Pure water pH is 7
Salt water pH is 8-9 Salt water is less acidic than pure water |
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Interpret the general chemical equation X + Y yields XY, in words.
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Two elements chemically combine to yield a compound.
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What is one of the most important factors in determining whether a chemcial reaction will occur?
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Changes in energy
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Name two essential roles that enzymes play in cells.
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Enzymes regulate chemcial pathways, release energy, transfer information.
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Compare protons, electrons, and neutrons (location, charge, and mass)
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Protons have positive charge and found in nucleus and weigh the most
Electrons are outside the nucleus, have negative charge and weigh the least Neutrons are inside the nucleus, have no charge and weight almost as much as protons. |
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What relationship exists between the mass number of an element and the isotopes of that element?
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The mass number changes because the mass number is the sum of the protons and neutrons, so more neutrons (an isotope) more the mass number.
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Explain the difference between ionic compounds and covalently bonded compounds.
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Ionic bonding means an electron has been transferred from one atom to another. In covalent bonding, the electrons are shared between atoms
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Compare a pH of soap at 4, of soap with a pH of 10 and pure water with a pH of 7.
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The soap (pH 4) in more acidic and has more H- ions than pure water and the soap (pH 10) is less acidic and has more H+ negative ions or more alkaline than water.
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Why are atoms considered neutral
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If they are in a neutral state, they have the same number of protons and electrons which cancels out any charge
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What is a mass number
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The sum of the protons and neutrons in the nucleus of the atom
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What is a molecule?
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A molecule is the smallest unit of most chemical compounds
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What are the main types of chemical bonds
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Covalent bonds-where electrons are shared between atoms
Ionic bonds where one atom takes an electron from another |
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Where would you most likely find shared electrons in a water molecule?
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Near the oxygen atom of the water molecule
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What is a mixture?
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A mixture is a material made up of two or more elements or compounds that are physically mixed together, not chemically.
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Use the terms solvent and solute to describe how to prepare a salt solution.
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The salt is the solute and the water is the solvent
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Based on its pH value, is sea water more acidic or less acidic than pure water?
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Pure water pH is 7
Salt water pH is 8-9 Salt water is less acidic than pure water |
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Interpret the general chemical equation X + Y yields XY, in words.
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Two elements chemically combine to yield a compound.
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What is one of the most important factors in determining whether a chemcial reaction will occur?
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Changes in energy
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Name two essential roles that enzymes play in cells.
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Enzymes regulate chemcial pathways, release energy, transfer information.
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Compare protons, electrons, and neutrons (location, charge, and mass)
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Protons have positive charge and found in nucleus and weigh the most
Electrons are outside the nucleus, have negative charge and weigh the least Neutrons are inside the nucleus, have no charge and weight almost as much as protons. |
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What relationship exists between the mass number of an element and the isotopes of that element?
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The mass number changes because the mass number is the sum of the protons and neutrons, so more neutrons (an isotope) more the mass number.
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Explain the difference between ionic compounds and covalently bonded compounds.
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Ionic bonding means an electron has been transferred from one atom to another. In covalent bonding, the electrons are shared between atoms
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Compare a pH of soap at 4, of soap with a pH of 10 and pure water with a pH of 7.
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The soap (pH 4) in more acidic and has more H- ions than pure water and the soap (pH 10) is less acidic and has more H+ negative ions or more alkaline than water.
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How is chemistry related to living things?
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Everything living is made up of atoms and chemical compounds. Chemical reactions are happening in living things at all times.
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X + Y yields XY reacts and gives off heat. Why does this reaction happen spontaneously while the reverse reaction XY yields X + Y does not happen?
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A chemical reaction that relases energy or heat often happen on their own. Chemcial reactions that absorb enery will not occur without a sorce of energy.
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COmpare enzyme activity to a lock and key
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Enzymes are like keys that fit into a certain design like a lock. If the right enzyme isn't there to fit in the right section, then the reaction will not happen.
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How is chemistry related to living things?
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Everything living is made up of atoms and chemical compounds. Chemical reactions are happening in living things at all times.
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X + Y yields XY reacts and gives off heat. Why does this reaction happen spontaneously while the reverse reaction XY yields X + Y does not happen?
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A chemical reaction that relases energy or heat often happen on their own. Chemcial reactions that absorb enery will not occur without a sorce of energy.
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COmpare enzyme activity to a lock and key
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Enzymes are like keys that fit into a certain design like a lock. If the right enzyme isn't there to fit in the right section, then the reaction will not happen.
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