Q: Which of the following is the correct conversion of $$5.00 m$^3 to cm$^3$$? (Recall $$1 m$$ $$= 100 cm)$$

$$5.00 \times 10^6$ \text{ cm}^3$

Q: A laboratory experiment requires $$0.500 L of a $$solution. How many microliters ($$\muL) is $$this?

$$5.00 \times 10^5$ \mu\text{L}$

Question 1

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

Accepted Answer

$$3.45 	imes 10^4$

Question 2

How many significant figures are in the measurement $$0.004560$$?

Accepted Answer

4

Question 3

A student measures the mass of a metal cylinder as $$12.34 g $$and its volume as $$4.56 cm$^3. $$What is the density of the cylinder, reported with the correct number of significant figures?

Accepted Answer

$$2.71 g/cm$^3$$

Question 4

Convert $$25.0$$ °C to Kelvin. (Use $$K = ^\circ C + 273.15)$$

Accepted Answer

$$298.15 K$$

Question 5

Which of the following is the correct conversion of $$5.00 m$^3 to cm$^3$$? (Recall $$1 m$$ $$= 100 cm)$$

Accepted Answer

$$5.00 	imes 10^6$ 	ext{ cm}^3$

Question 6

Which SI prefix corresponds to the factor $$10^{-9}$$?

Accepted Answer

nano-

Question 7

A sample of ethanol has a density of $$0.789 g/mL. $$What is the mass, in grams, of $$250.0 mL of $$ethanol?

Accepted Answer

$$197 g$$

Question 8

Which of the following statements about the subatomic particles in an atom is correct?

Accepted Answer

Protons and neutrons are located in the nucleus, while electrons are found outside the nucleus.

Question 9

Which is the correct isotopic symbol for an atom with $$17$$ protons, $$18$$ neutrons, and $$17$$ electrons?

Accepted Answer

$$^{35}_{17}	ext{Cl}$$

Question 10

A neutral atom of magnesium has an atomic number of $$12$$ and a mass number of $$24. $$How many neutrons does it contain?

Accepted Answer

12

Question 11

Which of the following ions has $$10$$ electrons?

Accepted Answer

$$	ext{Na}^+$$

Question 12

A student needs to convert $$0.250 kg to $$milligrams. What is the correct answer?

Accepted Answer

$$2.50 	imes 10^5$ 	ext{ mg}

Question 13

Which of the following best describes how the charge of an ion is determined?

Accepted Answer

The charge is equal to the number of protons minus the number of electrons.

Question 14

A sample of gas occupies $$2.50 L at$$ $$25.0$$ °C. What is the volume in mL at the same temperature?

Accepted Answer

$$2500$$ 	ext{ mL}

Question 15

Which of the following correctly expresses $$0.00056 in $$standard scientific notation?

Accepted Answer

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

Question 16

A laboratory experiment requires $$0.500 L of a $$solution. How many microliters ($$\muL) is $$this?

Accepted Answer

$$5.00 	imes 10^5$ \mu	ext{L}$

Question 17

Which of the following best describes the difference between an atom and an ion?

Accepted Answer

An ion has a different number of electrons than protons, while an atom has equal numbers of protons and electrons.

Question 18

A patient’s body temperature is measured as $$102.2$$ °F. What is this temperature in Celsius? (Use $$^\circ C = ( ^\circ F - 32 ) 	imes \frac{5}{9})$$

Accepted Answer

$$39.0$$ ^\circ C

Question 19

Which of the following best explains why the mass number of an atom is not found on the periodic table?

Accepted Answer

The periodic table lists the average atomic mass, which accounts for all naturally occurring isotopes, not the mass number of a single isotope.

Question 20

A cube of metal has a mass of $$54.0 g $$and a volume of $$20.0 cm$^3. If $$the accepted density of the metal is $$2.70 g/cm$^3$$, what is the percent error in the student's measurement? (Use $$	ext{Percent Error} = \frac{|	ext{Experimental} - 	ext{Accepted}|}{	ext{Accepted}} 	imes 100\%)$$

Accepted Answer

Study Guide: Exam 1 (General Chemistry I, Chapters 1 & 2)

Guida di studio - Domande di pratica

Study guide - Flashcard