Q: What mass in milligrams does $$2.63$$ moles of nickel have? (Nickel's molar mass is $$58.69\ \text{g/mol}$$; $$1\ \text{g} = 1000\ \text{mg})$$

$$3.56 \times 10^5$\ \text{mg}$$

Question 1

Which law states that in a chemical reaction, matter is neither created nor destroyed?

Accepted Answer

the Law of Conservation of Mass

Question 2

A student places a metal object with a mass of 149.8 g into a graduated cylinder containing water. The water level rises by 12.1 mL. What is the density of the metal? Use the formula $$	ext{Density} = \frac{	ext{Mass}}{	ext{Volume}}.$$

Accepted Answer

$$8.08\ 	ext{g/mL}$$

Question 3

Which of the following best describes a solid?

Accepted Answer

definite volume and definite shape

Question 4

A calculation is performed as follows: $$(965.43 	imes 3.911) + 9413.4136. $$What answer should be reported with the correct number of significant figures?

Accepted Answer

$$1.3 	imes 10^4$

Question 5

The outside temperature is $$65^\circ 	ext{C}. $$What is the temperature in Fahrenheit? Use the formula $$T_F = \frac{9}{5}T_C + 32.$$

Accepted Answer

$$149^\circ 	ext{F}$$

Question 6

Silver has two naturally occurring isotopes: Ag-107 ($$106.90509$$ amu, $$51.84\%) $$and Ag-109 ($$108.90476$$ amu, $$48.46\%). $$What is the atomic mass of silver? Use $$	ext{Atomic mass} = (	ext{mass}_1 	imes 	ext{abundance}_1) + (	ext{mass}_2 	imes 	ext{abundance}_2).$$

Accepted Answer

$$107.79\ 	ext{amu}$$

Question 7

What mass in milligrams does $$2.63$$ moles of nickel have? (Nickel's molar mass is $$58.69\ 	ext{g/mol}$$; $$1\ 	ext{g} = 1000\ 	ext{mg})$$

Accepted Answer

$$3.56 	imes 10^5$\ 	ext{mg}$$

Question 8

What is the correct name for $$	ext{H}_2	ext{CO}_3$$?

Accepted Answer

carbonic acid

Question 9

Write the formula for the compound formed between aluminum and sulfur.

Accepted Answer

$$	ext{Al}_2	ext{S}_3$$

Question 10

Which of the following statements best describes the Law of Definite Proportions?

Accepted Answer

A compound always contains the same elements in the same proportion by mass.

Question 11

A chemist mixes two clear solutions and observes the formation of a white solid. Which type of change has occurred?

Accepted Answer

Chemical change

Question 12

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Sand and iron filings

Question 13

Which element is represented by the symbol 'Sc'?

Accepted Answer

Scandium

Question 14

A sample of water is heated from $$25^\circ 	ext{C} to$$ $$75^\circ 	ext{C}. $$What is the change in temperature in Kelvin? Use $$\Delta T = T_{final} - T_{initial}$$ and $$1^\circ 	ext{C} = 1\ 	ext{K}.$$

Accepted Answer

$$50\ 	ext{K}$$

Question 15

Which of the following is NOT a postulate of Dalton's Atomic Theory?

Accepted Answer

Atoms can be created or destroyed in chemical reactions.

Question 16

A patient receives a dose of $$0.250\ 	ext{g} of a $$medication. How many milligrams is this? ($$1\ 	ext{g} = 1000\ 	ext{mg})$$

Accepted Answer

$$250\ 	ext{mg}$$

Question 17

Which of the following is a chemical property?

Accepted Answer

Ability to react with oxygen

Question 18

A compound contains $$40.0\%$$ carbon, $$6.7\%$$ hydrogen, and $$53.3\%$$ oxygen by mass. Which law does this illustrate?

Accepted Answer

Law of Definite Proportions

Question 19

Which of the following is a real-life example of the Law of Conservation of Mass?

Accepted Answer

Burning wood and measuring the total mass of ash, gases, and water vapor produced

Question 20

A student needs to prepare $$250\ 	ext{mL} of a$$ $$0.10\ 	ext{M}$$ NaCl solution. How many grams of NaCl are required? (NaCl molar mass $$= 58.44\ 	ext{g/mol}$$; $$	ext{M} = \frac{	ext{mol}}{	ext{L}})$$

Accepted Answer

$$1.46\ 	ext{g}$$

CHEM 1311 Exam 1 Review – Step-by-Step Study Guidance

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