7th Grade Checkpoint Review (2nd)

In the chemical formula for Ammonia, NH₃, what does the N represent?

• Three atoms of the element Hydrogen.

• One atom of the compound Nitrogen.

• Three atoms of the element Nitrogen.

• One atom of the element Nitrogen.

Tags

NGSS.MS-PS1-1

Which element is represented by the symbol 'Be'?

• Beryllium

• Boron

• Bismuth

• Bromine

Which element has the symbol 'O'?

• Oxygen

• Osmium

• Oganesson

• Osmium

What is the average atomic mass of Neon?

• 20.18

• 18.99

• 21.00

• 22.99

Tags

NGSS.MS-PS1-1

Which element is represented by the symbol 'Na'?

• Sodium

• Nitrogen

• Neon

• Nickel

The following everyday activities are either chemical changes or physical changes to matter. Select physical changes found in the answer choices below.

• Melting ice

• Burning wood

• Dissolving sugar in water

• Rusting iron

Tags

NGSS.MS-PS1-2

Frank is in the kitchen preparing dinner for his family. He is thinking of all the things he could do with the chicken he bought from the grocery store. He could: freeze it, shred it, grind it, boil it, cook it on the stove, or even burn it accidentally. Which would be physical changes to the chicken?

• Freezing

• Cooking

• Grinding

• Burning

• Shredding

What was Angela investigating in her experiment?

• The effects of temperature on the rate of dissolution

• The effects of agitation on the rate of dissolution

• The effects of light on the rate of dissolution

• The effects of pressure on the rate of dissolution

What is the element symbol for Gold?

• Ag

• Au

• Ga

• Ge

Which of the following is an example of a physical change?

• Burning wood

• Melting ice

• Rusting iron

• Baking a cake

Tags

NGSS.MS-PS1-4