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When you decrease the temperature of a liquid what does it become?
Solid.
Is rusting/oxidization a chemical or physical reaction?
Chemical reaction.
What is a phase change of a solid turning into a liquid called?
Melting.
What does the Law of Conservation of Mass say?
Mass cannot be created or destroyed in a physicalor chemical reaction.
If my reactants have a mass of 40 grams, then how much do my products weigh?
40 grams.
When you increase the temperature of a solid, what does it become?
Liquid
Is ice forming on your car window considered a physical or chemical reaction?
Physical reaction.
What is a phase change of a solid turning into a gas called?
Sublimation.
What are the smallest units of an element called?
Atoms.
If Na + Cl react to create NaCl, which part of the equation are the reactants and which are the products?
Sodium + Chloride (Na+Cl) = reactants
Sodium Chloride = product.
Which state has the fastest moving atoms?
Gas
Is an ice cream cone melting considered a physical or chemical change?
Physical change.
What is a change from a liquid to a solid called?
Freezing.
What is a reactant?
The substance that is present at the start of a chemical reaction and goes through a chemical change.
If the mass of my products after a chemical reaction is 500 grams, how much did my reactants weigh?
500 grams.
Does air have mass?
Yes - oxygen is an element that has mass, even if it is invisible.
Is your stomach digesting food considered a chemical or physical reaction?
Chemical reaction.
What is condensation?
Phase change of a gas turning into a liquid
What is a product?
The substance that is produced in a chemical reaction.
If 55 grams of Magnesium and 120 grams of Oxygen react, what is the mass of their product?
175 grams.
What must happen for matter to change states?
It must gain or lose energy.
Is a car engine starting considered to be a chemical or a physical reaction?
Chemical reaction
What is evaporation?
When heat is added to a liquid and becomes a gas.
What is matter?
Anything that has mass and takes up space.
What are all molecules always in a constant state of?
Motion.