Unit 1 Check In

1

A substance is found to be reactive, flammable, soluble, and explosive. Which of these observations is a physical property?

A. reactive

B. flammable

C. soluble

D. explosive

1

Holding a marshmallow near a campfire flame causes it to turn brown even if the marshmallow does not touch the flame. Why does this happen?

A. Dust blowing through the air causes the marshmallow to brown.

B. Heat radiates from the fire and cooks the marshmallow.

C. Smoke and soot from the fire cause the marshmallow to brown.

D. Hot air in the atmosphere cooks the marshmallow.

1

The substances in a chemical reaction that are combined or separated to form new substances are the _______.

A. reactants

B. coefficients

C. products

D. chemical equations

1

Which of the following is an example of a compound?

A. H2O

B. O

C. Na

D. Cl

1

A model of a carbon dioxide molecule is shown in the image to your left.
Which of the following best describes the carbon dioxide molecule?

A. It contains two atoms from three elements.

B. It contains two elements from three compounds.

C. It contains three compounds from two elements.

D. It contains three atoms from two elements.

1

In atomic theory, new substances are formed when the atoms of other substances are rearranged. In this kind of change, the total number of atoms is conserved.
An example of this is shown in the diagram below. There are six atoms
both before and after the arrow.
Which statement below is also true of the rearrangement of atoms?

A. The amount of matter decreases.

B. The amount of matter is conserved.

C. The number of substances is conserved.

D. The number of substances increases.

Unit 1 Check In

A substance is found to be reactive, flammable, soluble, and explosive. Which of these observations is a physical property?

Holding a marshmallow near a campfire flame causes it to turn brown even if the marshmallow does not touch the flame. Why does this happen?

The substances in a chemical reaction that are combined or separated to form new substances are the _______.

Which of the following is an example of a compound?

A model of a carbon dioxide molecule is shown in the image to your left.Which of the following best describes the carbon dioxide molecule?

A substance is found to be reactive, flammable, soluble, and explosive. Which of these observations is a physical property?

Holding a marshmallow near a campfire flame causes it to turn brown even if the marshmallow does not touch the flame. Why does this happen?

The substances in a chemical reaction that are combined or separated to form new substances are the _______.

Which of the following is an example of a compound?

A model of a carbon dioxide molecule is shown in the image to your left.Which of the following best describes the carbon dioxide molecule?

A model of a carbon dioxide molecule is shown in the image to your left.
Which of the following best describes the carbon dioxide molecule?

A model of a carbon dioxide molecule is shown in the image to your left.
Which of the following best describes the carbon dioxide molecule?