Chemistry Unit Test

The model below shows the type of matter that a material is made of. Which answers describe the material? CHOOSE TWO ANSWERS.

• Mixture
• Substance
• Made of Atoms
• Made of Molecules

The model below shows the type of matter that a material is made of. Which answers best describe the material? CHOOSE TWO ANSWERS.

• Mixture
• Substance
• Made of Atoms
• Made of Molecules

During photosynthesis, plants take in carbon dioxide and water. The model below shows the result. Does this combination create a chemical reaction or a mixture? Give evidence from the model to support your answer.

• The properties of carbon dioxide and water are different from the properties of glucose and oxygen.
• The water dissolved the carbon dioxide so it is not a part of the products.
• The water turns from a liquid to a gas during the reaction.
• All of the atoms in the reactants are in the products, just rearranged.

Methane gas (CH4) reacts with oxygen (O2) to form carbon dioxide (CO2) and another product. Using the equation and model below, which of the following atoms could NOT be included in the second product of this equation? (CHOOSE 2)

• Carbon (C)
• Hydrogen (H)
• Nitrogen (N)
• Oxygen (O)

You find a silver colored metal that you think is zinc. What could you do to figure out if the metal is zinc?

• Measure its length and compare it to the length of pieces of zinc to see if they are the same.
• Measure its melting point and compare it to the melting point of zinc to see if they are the same.
• Measure its mass and compare it to the mass of pieces of zinc, to see if the mass is the same.
• Determine its shape and compare it to the shape of pieces of zinc to see if they are the same.

Jaleesa draws a model of a chemical reaction between two substances. She uses a black circle to represent one kind of atom and a white circle to represent another kind of atom. Which model shows that a chemical reaction takes place AND that mass is conserved (stays the same)?

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• 
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Substance A reacts with Substance B to form Substance C. What is true about Substance C? (CHOOSE 2)

• Substance C will have different properties than Substance A and Substance B.
• Substance C is a product.
• Substance C is a reactant.
• The atoms that made Substance A and Substance B have disappeared.

Water

• substance
• mixture

Gold

• substance
• mixture

Lemonade

• substance
• mixture