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43 Cards in this Set
- Front
- Back
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3 examples of matter |
Solid, liquid, and a gas |
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List examples of physical properties |
Odor, hardness, color, shine, density, state of matter |
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Name the change that occurs at a substances melting point |
It changes from a solid to a liquid |
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Name different examples of mixtures |
Alloy, colloids, solutions, and suspensions |
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Density equals.... |
Mass divided by volume |
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What is buoyant force? |
The force on a submerged object toward the surface |
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What is the relationship of elements and atoms? |
Atoms are the smallest particle of an element that retains the same chemical properties of that element. |
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Where are the electrons in an atom? |
They move around the nucleus |
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Where are the protons and neutrons in an atom? |
They are inside the nucleus |
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What are the many things found in an atom? |
Protons, neutrons, electrons, and the nucleus |
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Compare the model of an atom of 1803 to the model as it is known today. |
From a tiny solid marble in appearance to clouds of electrons surrounding a nucleus packed with protons and electrons |
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Name the 3 sections on a periodic table |
Metals, nonmetals, and metaloids |
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Name the two ways the periodic table is divided |
By periods and properties |
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What metals can do... |
Good conductors Able to change chemically when exposed to air Bendable |
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Are metals brittle? |
No |
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Are nonmetals brittle? |
Yes |
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Compounds are a result of a chemical change because |
Two substances combine chemically and produce a new substance called a compound |
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What is a chemical formula? |
Letters that show how many atoms of each element are chemically bonded together |
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What are covalent bonds? |
Two atoms are sharing same electrons |
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Why do ionic bonds form? |
They form because opposite charges attract |
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What is matter? |
Everything that makes up the world around us. It has mass and takes up space. |
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What is mass? |
The amount of matter in an object |
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What is volume? |
The amount of space an object takes up |
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What is a physical property? |
It can be observed without changing the identity of a substance |
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An example of physical change? |
Cutting paper |
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What is physical change? |
Changing of a substance by size, shape or state and not changing into a new substance |
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What is a solution? |
A mixture of one substance dissolved in another. Properties are same throughout. |
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What is an element? |
A substance that cannot be broken down any further |
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What is an atom? |
The smallest particle of an element that has same properties of that element |
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What is a nucleus? |
The largest and most visible part of an atom. It is dense and has most of the mass of atom. |
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What is a proton? |
A positively charged particle inside nucleus of an atom. |
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What is a neutron? |
A particle with no charge inside the atom's nucleus. |
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What is an electron? |
A negatively charged particle that moves around an atom's nucleus. |
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What is an atomic number? |
The number of protons in an atom. |
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Describe a metal |
A group of elements that can conduct heat and electricity and is shiny and bendable |
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What is a compound? |
A chemical combination of two or more elements |
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What is a chemical bond? |
A link that atoms can form with each other |
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What is an ion? |
An electronically charged particle with unique numbers of protons and electrons |
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What is a chemical property? |
A way of describing a substance by how it reacts chemically to other substances |
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What is a molecule? |
A group of tightly bonded atoms that acts like a single particle (ex. Water) |
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What is Ectothermic ? |
A reaction that gives off heat |
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What is endothermic ? |
A reaction that absorbs heat |
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A color change or heat and light given off are signs of ___________ |
A chemical change |
