Which of the following lists all the elements that are present in a molecule of potassium carbonate, K₂CO₃ ?

• Arbon and Oxygen
  

• phosphate and calcium
• potassium, carbon, and oxygen
• phosphorus, oxygen, and calcium

Tags

NGSS.MS-PS1-1

The formula for glucose is C₆H₁₂O₆. How many elements does glucose contain?

• 1
• 3
• 24
• 432

Tags

NGSS.MS-PS1-1

Acetic acid is a compound found in vinegar. The chemical formula for acetic acid is CH₃COOH.

How many different elements are in acetic acid?

• 3
• 5
• 6
• 8

Tags

NGSS.MS-PS1-1

A student mixes two solutions, planning to produce carbon dioxide. Which of the following is the BEST evidence that a chemical reaction is producing carbon dioxide?

• color change
• formation of a solid
• temperature change
• formation of bubbles

Tags

NGSS.MS-PS1-2

The Best Friend's Club uses "invisible ink" to write notes to each other. The invisible ink is actually lemon juice that is clear when it dries on paper but turns brown when a club member holds a burning candle under the paper. Once it is heated, it is never invisible again.

What type of change is occurring when the paper is heated?

• chemical change
  

• elemental change
• physical change
• temperature change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Students collect rock samples on a field trip and test them for different properties. Which of the following is a chemical property of rocks?

• having a white color
• reacting when tested with a drop of acid
• having a rough surface
• being easy to scratch with a piece of metal

Tags

NGSS.MS-PS1-2

Which of the following is the BEST evidence that rusting is a chemical property rather than a physical property of iron?

• Rust forms slowly.
• Rust can form on any iron.
• Rust cannot turn back into iron.
• Rust does not look the same as iron.

In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?

• H₃PO₄
• H₂SO₄
• HCIO₃
• H₂O

Tags

NGSS.MS-PS1-1

The chemical formula for sodium sulfate is Na₂SO₄. How many sulfur atoms are in the formula for sodium sulfate?

• 1
• 2
• 6
• 7

Tags

NGSS.MS-PS1-1

How many atoms are in one molecule of baking soda, NaHCO₃?

• 5
• 4
• 12
• 6

Tags

NGSS.MS-PS1-1