Inspire Science Unit 1 Assessment

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 signs of a chemical reaction. Therefore, the correct choice is 'all of these indicate that a chemical reaction has occurred.'

Tags

NGSS.5-PS1-4

The particles that make up gases are:

• very close together

• very far apart

• tightly packed

• in a fixed position

Answer explanation

The particles that make up gases are very far apart compared to solids and liquids. This spacing allows gases to expand and fill their containers, which is why they do not have a fixed shape or volume.

Tags

NGSS.5-PS1-3

How are reflectivity and solubility related?

Answer explanation

Reflectivity and solubility are related through the interaction of light with materials. High reflectivity often indicates low solubility, as reflective surfaces tend to be less porous and do not absorb liquids well.

Tags

NGSS.5-PS1-3

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. Thus, 350 mL + 430 mL equals 780 mL, making the correct choice: 350 mL + 430 mL = 780 mL.

Tags

NGSS.5-PS1-2

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 one that can be observed or measured without altering the substance's chemical structure. Examples include color, density, and boiling point, making 'physical' the correct choice.

Tags

NGSS.5-PS1-3

A ______ produces new matter with new and different properties.

• physical change

• chemical property

• chemical change

• physical property

Answer explanation

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

Tags

NGSS.5-PS1-4

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's identity, while burning changes the substance into different materials.

Tags

NGSS.5-PS1-4

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

• Reflectivity

• Solubility

• Color

• Conductivity

Answer explanation

Reflectivity is the correct answer as it specifically refers to how light bounces off surfaces, distinguishing it from other properties like solubility, color, and conductivity, which describe different characteristics.

Tags

NGSS.4-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.

Tags

NGSS.5-PS1-3

A boiled egg in its shell weighs ______________ a raw egg in its shell.

• more than

• the same as

• less than

Answer explanation

A boiled egg loses some water during the cooking process, making it lighter than a raw egg, which retains all its moisture. Therefore, a boiled egg in its shell weighs less than a raw egg in its shell.

Tags

NGSS.5-PS1-2