Unit 1 matter test practice

Which of the following indicate that a chemical reaction has occurred?

• the formation of gas bubbles

• a change in color

• an odor

• all of these indicate that a chemical reaction has occurred.

Answer explanation

All the options—formation of gas bubbles, a change in color, and an odor—are indicators of a chemical reaction. Therefore, the correct choice is 'all of these indicate that a chemical reaction has occurred.'

Tags

NGSS.MS-PS1-2

Fill in the blanks using the available answer choices. The particles that make up gases are ___________________________.

• very far apart

• very close together

• in a fixed position

• slow moving

Answer explanation

The correct choice is 'very far apart' because gas particles are widely spaced compared to solids and liquids, allowing them to move freely and fill their container.

Reflectivity and solubility are related in which of the following ways?

• They both depend on temperature.

• They are both properties of metals.

• They are unrelated properties.

• They both increase with pressure.

Answer explanation

Reflectivity and solubility are distinct properties. Reflectivity pertains to how much light a surface reflects, while solubility refers to how well a substance dissolves in a solvent. Thus, they are unrelated properties.

You are performing an experiment combining two substances in a closed container. You first pour 350 mL of substance one followed by 430 mL of substance two. A chemical reaction occurs. Choose the equation below that would best explain the total mass of the combined substances.

• 430 mL - 350 mL = 80 mL

• 350 mL x 430 mL = 780 mL

• 350 mL + 430 mL = 780 mL

• 780 mL - 430 mL = 350 mL

Answer explanation

The total volume of the combined substances is found by adding their individual volumes. Therefore, 350 mL + 430 mL = 780 mL accurately represents the total volume after the reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Fill in the blanks using the available answer choices. A ____________ property is a characteristic that can be observed and measured without changing the material.

• physical

• chemical

• biological

• electrical

Answer explanation

A physical property is a characteristic that can be observed and measured without altering the substance. Examples include color, mass, and volume, distinguishing it from chemical properties, which involve changes in composition.

A ______ produces new matter with new and different properties.

• nuclear reaction

• physical property

• chemical property

• physical change

• chemical change

Answer explanation

A chemical change involves the transformation of substances, resulting in new matter with different properties, unlike physical changes which do not alter the substance's chemical identity.

Tags

NGSS.MS-PS1-2

The ability to burn is an example of a physical property.

• True

• False

Answer explanation

The ability to burn is a chemical property, not a physical one. Physical properties can be observed without changing the substance, while burning changes the substance's chemical structure.

________________ is a physical property that describes how light reflects off of an object.

• Reflectivity

• Density

• Conductivity

• Viscosity

Answer explanation

Reflectivity is the correct answer as it specifically refers to how light bounces off surfaces, making it a key physical property related to light reflection. The other options describe different properties unrelated to light.

Tags

NGSS.MS-PS4-2

The amount of space an object takes up is its _____.

• matter

• mass

• volume

• property

Answer explanation

The amount of space an object occupies is referred to as its volume. While mass measures the amount of matter in an object, volume specifically describes the three-dimensional space it fills.

Fill in the blanks using the available answer choices. A boiled egg in its shell weighs ______________ a raw egg in its shell.

• the same as

• more than

• less than

• twice as much as

Answer explanation

A boiled egg and a raw egg in their shells contain the same amount of matter. The boiling process does not change the mass of the egg, so they weigh the same.