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PC Changes E46-63
Physical Chemical Properties
| Question | Answer |
|---|---|
| All objects are made of ______________. | matter |
| Objects have mass and __________________. | space |
| The term for how the surface of an object feels is ____________. | texture |
| Metals can be pulled into thin threads without breaking because they have the physical proeprty of _________________. | ductility |
| The opposite to ductile and malleable is __________________. | brittle |
| Buoyancy is another ___________________ property. | physical |
| ____________________ is the ability to float in a liquid or to rise in a gas. | buoyancy |
| A chemical change is when a substance undergoes an ________________________ change. | irreversible |
| A new substance is formed and energy is either _______________ or ___________________. | released , absorbed |
| A chemical change is energy in two forms - _______________ and _______________. | heat , light |
| A chemical reaction that absorbs from the surroundings is an ______________ reaction. | endothermic |
| A chemical reaction that releases energy is an _______________ reaction. | exothermic |
| 5 signs that can help us identify a chemical change are ____________. | light, sound, smoke, new color or smell |
| The chemical changes that a substance can go through depend on its _____________ properties. | chemical |
| A substance that is broken down into simpler substances is called __________ reactions. | decomposition |
| An example of this would be when electric __________passes through water. | current |
| An oxidation reaction example is when copper reacts with ______________ and turns green. | oxygen |
| An example of a tarnished coin is the ________________ - _____________________ reaction which turns the coin dark solid. | oxidation reduction |
| The names for a slow oxidation reaction involving metals are _______, __________, and ____________. | rust, tarnish, corrosion |
| The chemical and physical properties of a ________ ________________ never vary. | pure substance |
| No matter how well the substances in a mixture are blended, they remain separate molecules and do not form ________ ____________________. | new compounds |
| Some ______________ are easy to identify because you can see their individual substances. | mixtures |
| When a mixture is _____, that means that it is not the same throughout. | uniform |
| A mixture differs from a compound in that the substances in a mixture are not _______________ combined. | chemically |
| Substances in a ______________ are chemically combined. | compound |
| In a mixture, substanced do not go through chemical changes so they can be separated from each other by ________________ methods. | physical |
| The process in which a mixture is made up of a solid and liquid are separated by heating them is called ___________. | distillation |
| A __________ is when the particles of each substance are mixed evenly in a mixture. | solution |
| Solutions can be made up of any combination of ____________, _____________, ______________. | solids, liquids, gases |
| A solid that is dissolved in a liquid is called ___________________. | solute |
| The liquid that is used when a solid is dissolved in it is called _______________. | solvent |
| Metals are mixed in different combinations to produce __________________. | alloys |
| The amount of mass that fits in a given volume is called ___________________. | density |
| The formula for density is ________________ | mass divided by volume |
| A substance formed of the atoms of two or more elements is called ______________. | compounds |
| A ________________ formula that does not only name the elements in a compound and it also shows how many atoms of each element make one molecule of the compound. | chemical |
| The strengths of acids and bases are measured on a ________________ scale. | pH |
| Solutions with a pH of 7 are called _______________. | neutral |
| A compound that reacts easily with other substances and their pH levels are less than 7 are known as ___________________________. | acid |
| A compound that also reacts easily with other substances and their pH levels are more than 7 are known as ______________________. | base |
Created by:
SONIAGODOY
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