Q: Convert 751 centigrams to micrograms. (Use $$1 \ \mathrm{cg} = 10$$^{-2}$$ \ \mathrm{g}$$ and $$1 \ \mathrm{\mu g} = 10$$^{-6}$$ \ \mathrm{g})$$

$$7.51 \times 10$$^{5}$$ \ \mathrm{\mu g}$$

Q: The world’s oceans contain approximately $$1.35 \times 10$$^{9}$$ \ \mathrm{km}^3 of $$water. What is the volume in liters? ($$1 \ \mathrm{km}^3 = 1 \times 10$$^{15}$$ \ \mathrm{L})$$

$$1.35 \times 10$$^{24}$$ \ \mathrm{L}$$

Question 1

Which of the following best describes the change that occurs when sugar dissolves in water?

Accepted Answer

It is a physical change because the sugar can be recovered by evaporating the water.

Question 2

Which pair of elements from the table provided would you expect to have the most similar chemical and physical properties?

Accepted Answer

Krypton and another noble gas

Question 3

A student adds Alka Seltzer to water and observes bubbles forming. What type of change is this and why?

Accepted Answer

Chemical change, because a gas is produced indicating a new substance.

Question 4

Which of the following is a mixture?

Accepted Answer

Blue Kool Aid

Question 5

How many significant figures are in the measurement 0.0040300?

Accepted Answer

6

Question 6

Convert 751 centigrams to micrograms. (Use $$1 \ \mathrm{cg} = 10$$^{-2}$$ \ \mathrm{g}$$ and $$1 \ \mathrm{\mu g} = 10$$^{-6}$$ \ \mathrm{g})$$

Accepted Answer

$$7.51 	imes 10$$^{5}$$ \ \mathrm{\mu g}$$

Question 7

A block of osmium has dimensions $$5.00 \ \mathrm{in} 	imes 4.00 \ \mathrm{in} 	imes 0.25 \ \mathrm{ft}. $$What is its volume in cubic centimeters? ($$1 \ \mathrm{in} = 2.54 \ \mathrm{cm}$$, $$1 \ \mathrm{ft} = 12 \ \mathrm{in})$$

Accepted Answer

$$327 \ \mathrm{cm}^3$$

Question 8

The world’s oceans contain approximately $$1.35 	imes 10$$^{9}$$ \ \mathrm{km}^3 of $$water. What is the volume in liters? ($$1 \ \mathrm{km}^3 = 1 	imes 10$$^{15}$$ \ \mathrm{L})$$

Accepted Answer

$$1.35 	imes 10$$^{24}$$ \ \mathrm{L}$$

Question 9

Which of the following best describes the process when a solid chemical is mixed with water and the temperature goes up?

Accepted Answer

It is an exothermic process because heat is released to the surroundings.

Question 10

A student is asked to classify the following: 'An alloy of zinc and tin.' What is the correct classification?

Accepted Answer

Mixture

Question 11

Which of the following is an example of potential energy?

Accepted Answer

A tank full of gasoline in a parked car

Question 12

Which of the following best describes the property: 'Lead is more dense than sulfur'?

Accepted Answer

Physical property

Question 13

What is the correct answer, with the proper number of significant figures, for the calculation $$\frac{1.92 - 1.32411}{1.32411} 	imes 100$$?

Accepted Answer

$$45.1$$

Question 14

Which of the following is a chemical property?

Accepted Answer

Silver metal will turn black after being in the air

Question 15

Which of the following is a compound?

Accepted Answer

Sodium chloride

Question 16

A student multiplies $$(3.000 	imes 10^4$) 	imes (9.0 	imes 10^6$). $$What is the answer in correct scientific notation and significant figures?

Accepted Answer

$$2.7 	imes 10$$^{11}$$

Question 17

Which of the following is a homogeneous mixture?

Accepted Answer

Tap water

Question 18

How many Kelvin is $$147.8$$ degrees Celsius? ($$K = ^\circ C + 273.15)$$

Accepted Answer

$$420.95 \ K$$

Question 19

Which of the following is an example of kinetic energy?

Accepted Answer

A football thrown by Tom Brady

General Chemistry: Classification of Matter, Properties, and Measurement

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