You have a solution of saltwater. Which statement best describes what happens when you perform a dilution by adding water?

• A. The concentration of the solution will increase

• B. The concentration of the solution does not change

• C. The concentration of the solution will decrease.

• D. The amount of solute increases.

Which of the following actions will increase the rate of dissolution of a solid solute into an aqueous solution?

• A. Stirring with a spoon

• B. Freezing the solute

• C. Decreasing the temperature

• D. Continuously adding more solute

Tags

NGSS.MS-PS1-4

Hannah is preparing a fruit salad. An example of a physical change is (a)   .

• Cutting an apple
• Burning wood in a fire
• Boiling an egg
• Baking a cake

Which of the following processes involve a chemical reaction? Select TWO correct answers.

• Cooking an egg

• Melting ice

• Digesting food

• Mixing sand and water

• Breaking a glass

Tags

NGSS.MS-LS1-7

NGSS.MS-PS1-2

Grace is conducting an experiment in her science class. She observes different processes. Which of the following is a chemical change?

• Dissolving

• Bubbles formed

• Evaporation

• Melting

Tags

NGSS.MS-PS1-2

When Maya places one teaspoon of sugar in a small beaker of water, the sugar will (a)   .

• It will change into water.
• It will dissolve in the water.
• It will melt to form a liquid.
• It will keep all its properties.

Tags

NGSS.MS-PS1-2

What is the chemical formula for potassium sulfate?

Element Number of Atoms

Potassium 2

Sulfur 1

Oxygen 4

• K₂SO₄

• K₂SO₄⁴

• 2(KSO)₄

• 2(KSO²)

Tags

NGSS.MS-PS1-1

Avery is conducting an experiment using Silver Nitrate, AgNO₃, in her chemistry class. How many nitrogen atoms are present in this chemical compound?

• A. 1

• B. 2

• C. 3

• D. 5

Tags

NGSS.MS-PS1-1

Match each term with its correct description related to making lemonade using a mix and water.

• The process of reducing the strength of lemonade by adding more water.

• A. solute

• The substance that is dissolved in water to make lemonade.

• B. solvent

• The liquid in which the lemonade mix is dissolved.

• D. dilution

• The amount of lemonade mix dissolved in each liter of water.

• C. concentration

Digesting Food is and example of a ____________ Change.

Tags

NGSS.MS-LS1-7

NGSS.MS-PS1-2