Onramps Unit 0.2 practice exam

Which of the following statements is true about the structure of the atom?

• Neutrons and protons have approximately the same mass.

• Neutrons and electrons have approximately the same mass.

• Protons and electrons have the same charge.

• Protons and neutrons have the same charge.

Which of the following compounds has an INCORRECT number of valence electrons?

• CO₂ has 18 valence electrons.

• SF₄ has 34 valence electrons

• H₂O has 8 valence electrons.

• F₂ has 14 valence electrons.

Tags

NGSS.HS-PS1-1

What functional relationships is generated with the following (x,y) pairs? (1,1), (2, 0.5), (3,0.33)

• inverse

• proportional

• exponential

• inverse square

Solve for y. y = (3 x 10^-4 ) (2 x 10⁷ )

• 6 x 10³

• 6 x 10²

• 6 x 10¹¹

• 6 x 10^-11

Solve for y.

y = [(3 x 10^-4 ) (6 x 10^-8 )]/(2 x 10¹¹)

• 9 x 10^-23

• 3.6 x 10^-1

• 9 x 10^-1

• 3.6 x 10-23

A 1 liter bottle of water contains about how many molecules of water? The density of water is 1 g/ml.

• about 3 x 10²⁵ molecules

• about 3 x 10²⁴ molecules

• about 6 x 10²³ molecules

• about 3 x 10²⁶ molecules

Which of the following must be the mks units for force expressed as Newtons?

• g m/s²

• kg m/s²

• kg cm/s²

• kg m/min²

Tags

NGSS.HS-PS2-1

How many hydrogen atoms are in a mole of benzene, C₆H₆?

• 3.6 x 10²⁴

• 6 x 10²³

• 6

• 36 x 10²⁴

Tags

NGSS.HS-LS1-6

A sample of water, H₂O, includes 6 grams of hydrogen. How many grams of oxygen, O, are found in the sample?

• 48

• 3

• 96

• 1

Tags

NGSS.HS-PS1-7

What is the percent composition of oxygen by mass in SO₂?

• 50%

• 66%

• 33%

• 25%