Quarterfinal 1 Review- Extra

Which of the following is a compound?

• Oxygen

• Water

• Gold

• Nitrogen

Tags

NGSS.MS-PS1-1

Which of the following is a pure substance?

• Air

• Salt water

• Iron

• Soil

Tags

NGSS.MS-PS1-4

Which of the following statements about significant figures is INCORRECT?

• All digits in a measured value are significant except leading zeros.

• Zeros at the end of a number and after the decimal point are significant.

• Zeros at the beginning of a number are always significant.

• All nonzero digits are always significant.

Which of the following is the best example of a homogeneous mixture?

• Salad

• Sand

• Salt water

• Granite

Which of the following is a chemical element?

• Water

• Carbon

• Air

• Salt

Which of the following elements is diatomic?

• Argon

• Sodium

• Oxygen

• Aluminum

A gold nugget has a mass of 25.0 grams and a volume of 7.80 mL. What is the density of the gold nugget?

• 3.21 g/mL

• 0.312 g/mL

• 32.1 g/mL

• 2.13 g/mL

How many neutrons are shown in this atom: Carbon–13?

• 6

• 7

• 13

• 19

A charged atom is a(n) ______________.

• isotope

• diatomic element

• orbital

• ion