6.3

Which of the following activities contributes the most to carbon emissions globally?

• Deforestation

• Agriculture

• Burning fossil fuels

• Respiration

Does this picture show a compound?

• No

• Yes

Tags

NGSS.MS-PS1-1

Salt water boils and the water completely evaporates, salt (NaCl) is left in the bottom of the beaker. Which of the following is left in the beaker?

• Compound

• Element

• Mixture

• None of the Above

Tags

NGSS.MS-PS1-1

How many elements are present in this compound?

• One

• Two

• Three

Tags

NGSS.MS-PS1-1

What is the pH level of a neutral solution?

• 6.3

• 7.0

• 8.5

• 5.5

Which of the following is the approximate pH of human blood?

• 6.3

• 7.4

• 8.0

• 5.0

Tags

NGSS.MS-PS1-2

What is the pH level of pure water at 25°C?

• 6.3

• 7.0

• 8.5

• 5.5

Which pH value indicates a basic solution?

• 6.3

• 7.0

• 8.5

• 5.5

What is the pH level of seawater?

• 6.3

• 8.1

• 7.0

• 5.5

Tags

NGSS.MS-PS1-2

Which of the following pH values represents an acidic solution?

• 6.3

• 7.0

• 8.5

• 5.5