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25 Cards in this Set
- Front
- Back
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What is a physical change?
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A physical change is any change that alters the form or appearance of matter.
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Give two examples of physical changes.
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1) bending paper
2) painting something 3) change in state (solid, liquid, gas) |
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What is a chemical change?
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A chemical change is a change in matter that produces one or more new substances.
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Give two examples of chemical changes.
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1) burning
2) rusting 3) cooking |
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What are table salt and table suger?
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They are pure substances.
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What is weight?
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Weight is a measure of the force of gravity on you.
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Will the mass and weight of an object change if you travel to the moon?
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The mass of an object will stay the same if you travel to the moon but the weight will decrease because there is less gravity on the moon.
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What is mass?
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The mass of an object is the measure of the amount of matter in the object.
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What piece of scientific equiptment do you use to measure mass?
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The triple beam balance.
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What units are used to measure mass?
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1) grams
2) kilograms |
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What is volume?
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Volume is the amount of space that matter occupies.
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What are two ways that you can measure volume?
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1) with a ruler (length times width times height)
2) water displacement |
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What units are used to measure volume?
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1) liters
2) milliliters 3) cubic centimeters |
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What is density?
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Density relates the mass of a material in a given volume.
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What is the formula to get density?
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The formula to get density is:
mass divided by volume |
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What is the density of water?
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The density of water is 1 gram/cubic centimeter.
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How can you tell if an object will sink in water?
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If the object's density is greater than the density of water, the object will sink.
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What are the chemical formulas for: water, carbon dioxide, carbon monoxide, table suger
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1) water: H2O
2) carbon dioxide: CO2 3) carbon monoxide: CO 4) table sugar: C12H22O11 |
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What is an element?
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An element is a pure substance that cannot be broken down into any other substances by chemical or physical means.
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What is an atom?
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An atom is the basic particle from which all elements are made.
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What are molecules?
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Molecules are groups of two or more atoms held together by chemical bonds.
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What is a compound?
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A compound is a pure substance made of two or more elements chemically combined in a set ratio.
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What is a heterogeneous mixture?
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You can see the different parts in a heterogeneous mixture.
ex: salad |
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What is a homogeneous mixture?
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The substances in a homogeneous mixture are so evenly mixed that you can't see the different parts.
ex: lemonade |
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What is a mixture?
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A mixture is made of two or more substances - elements, compounds, or both - that are together in the same place but are not chemically combined.
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