Mid Term

Which of the solids from the table above could you claim are both made of the same type of molecule throughout?

• Only solids 1 and 2

• Only solids 2 and 3

• All of the solids

• None of the solids

A scientist has two containers. Inside each container is a blue liquid. The liquids are substances. What can the scientist do to help find out whether these two liquids are both the same substance?

• Measure the density of the two liquids and compare the densities.

• Weigh each liquid and compare the weights.

• Measure the volume of each liquid and compare the volumes.

• Measure the temperature of each liquid and compare the temperatures.

You find a clear gem that is made of one substance. What could you do to identify whether the gem is a diamond?

• Measure its length and compare it to the length of other gems, including diamonds

• Determine its shape and compare it to the shape of other gems, including diamonds

• Determine its melting point and compare it to the melting point of other gems, including diamonds

• Measure its mass and compare it to the mass of other gems, including diamonds

Which change will produce a new substance?

• dissolving cocoa mix in water

• burning a piece of bread in a toaster

• heating water until it evaporates

• cooling water until if freezes

Which of the following is a chemical reaction?

• New atoms are formed when substances are mixed together

• A solid material melts and becomes a liquid

• Atoms of the reactants rearrange to form a new substance

A puddle that dries up in the street is an example of which of the following?

• a chemical reaction

• a physical change

• dissolving

Name the Product(s) in the equation above

• aluminum

• copper chloride

• copper

• aluminum chloride

Name the reactant(s) in the equation above

• aluminum

• copper chloride

• copper

• aluminum chloride

Ari dissolves 1 gram of sugar in 10 grams of water. What will be the mass of the dissolved sugar and water?

• less than 11 grams

• more than 11 grams

• 11 grams

• It is not possible to tell from the data

Which of the following is true about the principle of the conservation of mass?

• The mass of the products is never equal to the mass of the reactants.

• The mass of the products is less than the mass of the reactants

• The mass of the products is equal to the mass of the reactants

• The mass of the products is greater than the mass of the reactants