Q: Which of the following is the correct conversion factor to change kilometers to meters?

$$1 \text{ km} = 1000 \text{ m}$$

Question 1

Which of the following numbers is correctly written in scientific notation?

Accepted Answer

$$5.6 	imes 10$$^{-4}$$

Question 2

A student measures the mass of a sample as 12.30 g. How many significant figures are in this measurement?

Accepted Answer

4

Question 3

Which of the following is the correct conversion factor to change kilometers to meters?

Accepted Answer

$$1 	ext{ km} = 1000 	ext{ m}$$

Question 4

Which prefix represents $$10^{-6}$$?

Accepted Answer

micro-

Question 5

Which statement best describes a compound?

Accepted Answer

A substance made of two or more elements chemically bonded together.

Question 6

Which of the following elements is a transition metal?

Accepted Answer

Iron (Fe)

Question 7

What is the charge on an ion formed from a Group 2 (alkaline earth metal) element?

Accepted Answer

$$+2$$

Question 8

Which of the following is the correct formula for ammonium ion?

Accepted Answer

$$NH_{4}^{+}$$

Question 9

What is the correct name for $$Na_{2}SO$$_{4}$$?

Accepted Answer

Sodium sulfate

Question 10

Which formula represents a binary molecular compound?

Accepted Answer

$$CO_{2}$$

Question 11

Balance the following chemical equation: $$H_{2} + O_{2} \rightarrow H$$_{2}$$O$$

Accepted Answer

$$2H_{2} + O_{2} \rightarrow 2H_{2}O$$

Question 12

How many moles are in $$18.0 g of $$water ($$H_{2}O$)? (Molar mass of H$$_{2}$$O = 18.0 g/$$mol)

Accepted Answer

$$1.0$$ mol

Question 13

A chemical reaction has a theoretical yield of $$10.0 g $$and an actual yield of $$8.0 g. $$What is the percent yield?

Accepted Answer

$$80\%$$

Question 14

What is the molarity of a solution containing $$0.5$$ mol of NaCl in $$2.0 L of $$solution?

Accepted Answer

$$0.25 M$$

Question 15

Which of the following is a strong electrolyte?

Accepted Answer

Sodium chloride ($$NaCl)$$

Question 16

A solution is prepared by diluting $$100 mL of$$ $$2.0 M $$HCl to a final volume of $$500 mL. $$What is the final concentration?

Accepted Answer

$$0.40 M$$

Question 17

Which of the following steps is NOT required when calculating the percent composition of a compound?

Accepted Answer

Balance the chemical equation for the compound

Question 18

Which of the following ions has a $$-2$$ charge?

Accepted Answer

Sulfate ($$SO_{4}^{2-})$$

Question 19

Which statement about metals is TRUE?

Accepted Answer

Metals are malleable and ductile.

Question 20

Which of the following is the correct empirical formula for a compound containing $$40.0\%$$ carbon, $$6.7\%$$ hydrogen, and $$53.3\%$$ oxygen by mass?

Accepted Answer

$$CH_{2}O$

General Chemistry Study Notes: Measurement, Atomic Structure, Chemical Formulas, and Stoichiometry

Guida di studio - Domande di pratica

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