Question | Answer |
---|---|
A ___________________ is a change that results in the formation of a new substance. |
chemical change |
A _______________________ is a change that does not result in a new substance. |
physical change |
An ____________________ is the smallest possible particle of an element. | atom |
A _______________________is a physical change that occurs when matter changes from one state to another. | change of state |
A ___________________ is a trait of a substance by itself. | physical property |
A_____________________ is a property that involves how a substance interacts with other substances. | chemical property |
A_______________________is a substance made of two or more kinds of atoms that are chemically combined. | compound |
An ________________ is a substance made of just one kind of atom. | element |
Which items contain matter? Which items do not contain matter? paper, light, wood, heat, energy water, air, iron, sound, hair, rock, chocolate | Matter – paper, chocolate, wood, water, hair, iron, rock, air No matter – energy, sound, light,heat |
What is the difference between an element and a compound? | an element is made of one type of substance and a compound is made of more that one substance. |
Classify each substance as an element or compound. iron, salt, steel, sulfur dioxide, gold, water, silver,oxygen |
elements – iron, silver, oxygen, gold compounds – salt, steel, water, sulfur dioxide |
What are some physical properties of metals? | shiny, stretch out thin and flat like foil, can be pulled into wire |
Is hydrogen and oxygen combining to form water a physical or chemical change? | chemical change |
Is sugar dissolving in tea a chemical or physical change? | physical change |
Is liquid water freezing and becoming ice a physical or chemical change? | physical change |
Is baking bread a physical or chemical change? | chemical change |
If 2 substances are mixed (like popcorn and pretzels), but can later be separated, has a chemical reaction taken place? Yes or No. Explain. | No. No new substance has been formed. They can still be separated. |
If 2 or more substances are mixed together and they are baked in an oven, has a chemical reaction taken place? Yes or No. Explain. | Yes. A new substance was formed. Signs of a chemical change are present. |
Why is sugar dissolving in water a physical change and not a chemical change? | Sugar can be separated from the water through the process of evaporation. No new substance is formed. |
What happens to metal objects when left in water? | Metal objects rust. A chemical reaction takes place when water is left on a metal object. |
What are the 3 states of matter? How can each be changed? | Solid – heat will melt it and turn it to a liquid Liquid – freeze and become a solid or evaporate and form a gas Gas – cool and condense to form a liquid |
Is a rock crushed into small pieces a physical or chemical change? | physical change |
Is baking soda fizzing in vinegar a physical or chemical change? | chemical change |