Question 1

A patient is prescribed 250 mg of a medication. The available tablets are labeled as 0.125 g each. How many tablets should the patient take to receive the correct dose?

Accepted Answer

2 tablets

Question 2

Which of the following numbers has the correct number of significant figures?

Accepted Answer

$$0.00450$$ has 3 significant figures

Question 3

Convert $$37.0\ ^\circ\mathrm{C} to $$Kelvin ($$K). $$Use the formula $$K = ^\circ\mathrm{C} + 273.15.$$

Accepted Answer

$$310.15\ K$$

Question 4

A sample of liquid has a mass of $$45.0\ \mathrm{g}$$ and a volume of $$36.0\ \mathrm{mL}. $$What is its density?

Accepted Answer

$$1.25\ \mathrm{g/mL}$$

Question 5

Which of the following is a chemical change?

Accepted Answer

A piece of iron rusts in moist air

Question 6

A solution has a specific gravity of $$1.20. If $$the density of water is $$1.00\ \mathrm{g/mL}$$, what is the density of the solution?

Accepted Answer

$$1.20\ \mathrm{g/mL}$$

Question 7

Which of the following best describes the arrangement and movement of particles in a gas?

Accepted Answer

Particles are far apart and move rapidly in all directions

Question 8

Which element is essential for human health and is a major component of hemoglobin?

Accepted Answer

Iron ($$\mathrm{Fe})$$

Question 9

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons

Question 10

Which of the following elements has the electron configuration $$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^1$$?

Accepted Answer

Aluminum ($$\mathrm{Al})$$

Question 11

A sample of water is heated from $$25.0\ ^\circ\mathrm{C} to$$ $$75.0\ ^\circ\mathrm{C}. If $$the mass of water is $$100.0\ \mathrm{g}$$ and the specific heat of water is $$4.18\ \mathrm{J/g\ ^\circ C}$$, how much heat is absorbed? Use $$q = m 	imes c 	imes \Delta T.$$

Accepted Answer

$$20,900\ \mathrm{J}$$

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 of the following best describes the trend in atomic size as you move down a group in the periodic table?

Accepted Answer

Atomic size increases

Question 14

A block of metal has a mass of $$250\ \mathrm{g}$$ and a volume of $$50.0\ \mathrm{cm}^3. $$What is its density, and would it float or sink in water (density $$= 1.00\ \mathrm{g/cm}^3$$)?

Accepted Answer

Density is $$5.00\ \mathrm{g/cm}^3$$; it would sink

Question 15

Which of the following is the correct scientific notation for the number $$0.000560$$?

Accepted Answer

$$5.60 	imes 10$$^{-4}$$

Question 16

Which of the following phase changes is endothermic?

Accepted Answer

Ice melting to liquid water

Question 17

Which of the following elements has the highest ionization energy?

Accepted Answer

Neon ($$\mathrm{Ne})$$

Question 18

A nurse needs to prepare a $$5\% (w/v) $$saline solution. How many grams of NaCl are needed to make $$250\ \mathrm{mL} of $$this solution?

Accepted Answer

$$12.5\ \mathrm{g}$$

Question 19

Which of the following statements about energy is correct?

Accepted Answer

Kinetic energy is the energy of motion, while potential energy is stored energy

Question 20

Which of the following elements has 2 valence electrons and is in the s-block of the periodic table?

Accepted Answer

Magnesium ($$\mathrm{Mg})$$

Question 21

Which of the following best describes the heating curve of water as it is heated from ice at $$-10\ ^\circ\mathrm{C} to $$steam at $$110\ ^\circ\mathrm{C} at 1 $$atm?

Accepted Answer

Temperature increases during heating, but remains constant during phase changes

Study Guide: Chemistry and Measurements, Matter and Energy, Atoms and Elements

Guida di studio - Domande di pratica

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