AP Chemistry Unit 1 MC Practice

What mass of Au is produced when 0.0500 mol of Au₂S₃ is reduced completely with excess H₂?

• 9.85 g

• 19.7 g

• 24.5 g

• 39.4 g

• 48.9 g

Tags

NGSS.HS-PS1-7

When hafnium metal is heated in an atmosphere of chlorine gas, the product of the reaction is found to contain 62.2 percent Hf by mass and 37.4 percent Cl mass. What is the empirical formula for this compound?

• HfCl

• HfCl₂

• HfCl₃

• HfCl₄

• Hf₂Cl₃

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

According to the balance equation above, how many moles of HI would be necessary to produce 2.5 mol of I₂, starting with 4.0 mol of KMnO₄ and 3.0 mol of H₂SO₄?

• 20.

• 10.

• 8.0

• 5.0

• 2.5

Tags

NGSS.HS-PS1-7

A compound contains 1.10 mol of K, 0.55 mol of Te, and 1.65 mol of O. What is the simplest formula for this compound?

• KTeO

• KTe₂O

• K₂TeO₃

• K₂TeO₆

• K₄TeO₆

Tags

NGSS.HS-PS1-1

What volume of O₂ (g) is required to react with excess CS₂ (l) to produce 4.0 L of CO₂ (g)? (Assume all gases are measured at O^oC and 1 atm.)

• 12 L

• 22.4 L

• $\frac{1}{3}\ x\ 22.4\ L$

• 2 x 22.4 L

• 3 x 22.4 L

Tags

NGSS.HS-PS1-7

When 8.0 g of N₂H₄ (32 g mol^-1) and 92 g of N₂O₄ (92 g mol^-1) are mixed together and react according to the equation to the left, what is the maximum mass of H₂O that can be produced?

• 9.0 g

• 18 g

• 36 g

• 72 g

• 144 g

Tags

NGSS.HS-PS1-7

According to the equation above, how many moles of potassium chlorate, KClO₃, must be decomposed to generate 1.0 L of O₂ gas at standard temperature and pressure?

• $\frac{1}{3}\left(\frac{1}{22.4}\right)mol$

• $\frac{1}{2}\left(\frac{1}{22.4}\right)mol$

• $\frac{2}{3}\left(\frac{1}{22.4}\right)mol$

• $\frac{3}{2}\left(\frac{1}{22.4}\right)mol$

• $2\left(\frac{1}{22.4}\right)mol$

Tags

NGSS.HS-PS1-7

A compound contains 30. percent sulfur and 70. percent fluorine by mass. The empirical formula of the compound is

• SF

• SF₂

• SF₄

• SF₆

• S₂F

If 0.40 mol of H₂ and 0.15 mol of O₂ were to react as completely as possible to produce H₂O what mass of reactant would remain?

• 0.20 g of H₂

• 0.40 g of H₂

• 3.2 g of O₂

• 4.0 g of O₂

• 4.4 g of O₂

Tags

NGSS.HS-PS1-7

How many carbon atoms are contained in 2.8 g of C₂H₄?

• 1.2 x 10²³

• 3.0 x 10²³

• 6.0 x 10²³

• 1.2 x 10²⁴

• 6.0 x 10²⁴

Tags

NGSS.HS-PS1-7