Science Review Physical Science

Comprehensive Review of 7th Grade Standards

The Law of Conservation of Matter

Multiple Choice

The fact that matter is not created or destroyed in any chemical or physical change is called

• The Law of Conservation of Atoms

• The Law of Conservation of Matter

• The Law of Chemical Reactions

Multiple Choice

What is the property shared my most molecular compounds?

• non polar bonds

• ionic bonds

• boiling point is the same

Multiple Choice

In a chemical reaction the mass of the reactants is

• less than the mass of the product

• greater than the mass of the product

• the same as the mass of the product

Multiple Choice

What is shown in this diagram, and what kind of bonds does it have?

• molecule; covalent bonds

• ion; ionic bond

• metal; metallic bond

Multiple Choice

In a chemical reaction, the total mass of the reactants is

• less than the mass of the product

• greater than the mass of the product

• the same as the mass of the product

​Phase changes happen when thermal energy is added or removed.

​Conduction - energy between molecules

Convection -energy moving through liquid matter

Radiation - energy from the sun (photosynthesis)

Multiple Choice

An ice cube is frozen at 0^o C. This has less thermal energy than water at 0^o C. This is because,

• the ice cube has a greater mass

• the liquid water has fewer mass

• the ice cube is in a solid state

• the ice cube is in a gaseous state

Multiple Choice

All of the following are phases changes of matter except:

• evaporation

• convection

• sublimation

• deposition

Multiple Choice

Which of the following is always true about a chemical change?

• a chemical change produces new substances with new and different properties

• a chemical change causes a single substance to break down into two or more

• a chemical change uses electricity to break a compound into elements

Multiple Choice

All of the following are examples of molecules formed by chemical bonds EXCEPT

• water

• salt

• hydrogen

• air

Multiple Choice

At a constant temperature, when the volume of a gas is decreased, what happens to its pressure?

• it decreases

• it increases

• its stays the same

Multiple Choice

At a constant pressure, how are the temperature and volume of a gas related?

• they are inversely proportional

• they are directly proportional

• they are constant

Multiple Choice

Which of the following would be an appropriate scientific question to ask based on the investigation lab?

• How much oxygen and hydrogen are produced?

• Where do hydrogen gas comes from?

• What are the physical properties of water?

• How can water be produced from hydrogen and oxygen?

Multiple Choice

Copper Sulfide is formed from copper and sulfur. Which of the following best describes copper sulfide?

• it is a heterogeneous mixture

• the mixture is so evenly mixed that you cannot see the different parts

• copper sulfide is a compound with properties that are different from copper or sulfide

Match

Match the following

• ionic bonding

• covalent bonding

• alkali metals

• substance bonded by ionic bonds with three dimensional shapes

• a group of molecules bonded by covalent bonds

elements transfer electrons to another

elements share electrons

the most reactive elements in the periodic table

crystals (salts)

molecular compound

• elements transfer electrons to another

• elements share electrons

• the most reactive elements in the periodic table

• crystals (salts)

• molecular compound