Q: Which of the following nuclear equations correctly represents the beta decay of carbon-14?

$$^{14}_{6}\text{C} \$$rightarrow ^{14}$$_{7}\text{N} $$+ ^{0}$$_{-1}\beta$$

Q: Which of the following is a correct equality for metric units?

$$1\ \text{kg} = 1000\ \text{g}$$

Q: Which of the following is a correct conversion factor for the equality $$1\ \text{m} = 100\ \text{cm}$$?

$$\dfrac{1\ \text{m}}{100\ \text{cm}}$$

Question 1

Which of the following statements best describes a chemical?

Accepted Answer

A chemical is any substance that always has the same composition and properties wherever it is found.

Question 2

A student measures the mass of a sample as 0.0450 g. How many significant figures are in this measurement?

Accepted Answer

$$3$$

Question 3

Which of the following is an example of a physical change?

Accepted Answer

Ice melting to form liquid water.

Question 4

A patient receives 250 mL of a saline solution. How many liters is this?

Accepted Answer

$$0.250\ 	ext{L}$$

Question 5

Which of the following best describes the difference between a pure substance and a mixture?

Accepted Answer

A pure substance has a fixed composition, while a mixture has a variable composition.

Question 6

Convert a temperature of $$25\ ^\circ	ext{C} to $$Fahrenheit.

Accepted Answer

$$77\ ^\circ	ext{F}$$

Question 7

A sample of gold has a mass of $$96.5\ 	ext{g}$$ and a volume of $$5.00\ 	ext{mL}. $$What is the density of gold?

Accepted Answer

$$19.3\ 	ext{g/mL}$$

Question 8

Which of the following is the correct electron arrangement for a neutral atom of magnesium ($$	ext{Mg}$$, atomic number $$12$$)?

Accepted Answer

$$2,8,2$$

Question 9

Which element is a metalloid?

Accepted Answer

Silicon

Question 10

A radioactive isotope has a half-life of $$4$$ days. If you start with $$80\ 	ext{mg}$$, how much remains after $$12$$ days?

Accepted Answer

$$10\ 	ext{mg}$$

Question 11

Which of the following nuclear equations correctly represents the beta decay of carbon-14?

Accepted Answer

$$^{14}_{6}	ext{C} \$$rightarrow ^{14}$$_{7}	ext{N} $$+ ^{0}$$_{-1}\beta$$

Question 12

Which of the following statements about the periodic table is correct?

Accepted Answer

Elements in the same group have similar chemical properties.

Question 13

Which type of radiation consists of a particle with a $$+1$$ charge and the same mass as an electron?

Accepted Answer

Positron

Question 14

A sample of water is heated from $$20\ ^\circ	ext{C} to$$ $$80\ ^\circ	ext{C}. If $$the mass of water is $$50.0\ 	ext{g}$$ and the specific heat is $$4.18\ 	ext{J/g}^\circ	ext{C}$$, how much heat is absorbed?

Accepted Answer

$$12,500\ 	ext{J}$$

Question 15

Which of the following is a correct equality for metric units?

Accepted Answer

$$1\ 	ext{kg} = 1000\ 	ext{g}$$

Question 16

Which of the following best describes nuclear fusion?

Accepted Answer

Small nuclei combine to form a larger nucleus, releasing large amounts of energy.

Question 17

Which of the following is the correct electron arrangement for a neutral atom of oxygen ($$	ext{O}$$, atomic number $$8$$)?

Accepted Answer

$$2,6$$

Question 18

A Geiger counter is used to:

Accepted Answer

Detect and measure radiation by producing an electrical current when radiation ionizes gas in a tube.

Question 19

Which of the following statements about energy is correct?

Accepted Answer

Potential energy is stored energy, while kinetic energy is the energy of motion.

Question 20

Which of the following is a correct conversion factor for the equality $$1\ 	ext{m} = 100\ 	ext{cm}$$?

Accepted Answer

$$\dfrac{1\ 	ext{m}}{100\ 	ext{cm}}$$

GOB Chemistry Study Guide: Chapters 1–5 (Chemistry in Our Lives, Measurements, Matter & Energy, Atoms & Elements, Nuclear Chemistry)

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