Q: How many molecules are in 0.0889 g NaCl? ($M_{NaCl} = 58.44\ \mathrm{g/mol}$, $N_A = 6.022 \times 10^{23}$)

$9.17 \times 10^{20}$ molecules

Question 1

Which of the following best describes the role of carbon dioxide in the photosynthesis reaction: $6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2$?

Accepted Answer

It is the oxidizing agent

Question 2

A 17.3 g substance releases 29,836.36 J of heat after a change in temperature from $14.0^{\circ}C$ to $57.0^{\circ}C$. What is its specific heat capacity? Use the formula $q = mc\Delta T$.

Accepted Answer

$44.0\ \mathrm{J/g^{\circ}C}$

Question 3

Which of the following is a homogeneous mixture?

Accepted Answer

Air

Question 4

How many molecules are in 0.0889 g NaCl? ($M_{NaCl} = 58.44\ \mathrm{g/mol}$, $N_A = 6.022 	imes 10^{23}$)

Accepted Answer

$9.17 	imes 10^{20}$ molecules

Question 5

Which of the following elements would have the hardest time gaining an electron in a reaction?

Accepted Answer

Ne

Question 6

A 2-year-old, 27-pound child has a toxic reagent due to a kidney blockage. The amount of toxin is 1.0 mg/kg body weight. What is the correct dosage in mg for this child? ($1\ \mathrm{kg} = 2.2\ \mathrm{lb}$)

Accepted Answer

$12.3$ mg

Question 7

Which of the following statements about atomic theory is true?

Accepted Answer

Atoms are incredibly small and you can never see one with the naked eye

Question 8

Calculate the number of moles of a gas in a $3.71\ \mathrm{L}$ beaker held at $1.031\ \mathrm{atm}$ and $25.0^{\circ}C$. Use $PV = nRT$, $R = 0.0821\ \mathrm{L\ atm\ mol^{-1}\ K^{-1}}$.

Accepted Answer

$0.156$ mol

Question 9

Which of the following transitions for the hydrogen atom electron emits a photon of the smallest energy?

Accepted Answer

$n = 5 \rightarrow n = 4$

Question 10

A student is performing a double displacement chemical reaction with silver chloride and potassium nitrate. If 0.50 mol of silver chloride reacts with potassium bromide, how many moles of the precipitate will form at the end of the reaction?

Accepted Answer

$0.50$ mol

Question 11

Which of the following molecules contains an equal number of sigma and pi bonds?

Accepted Answer

C$_2$H$_4$

Question 12

Which element has the highest ionization energy?

Accepted Answer

F

Question 13

A sample of helium occupies $27.3\ \mathrm{L}$ under a pressure of $960\ \mathrm{mmHg}$ at $30.0^{\circ}C$. What volume will the sample occupy at the same temperature after decreasing the pressure to $744\ \mathrm{mmHg}$?

Accepted Answer

$35.3$ L

Question 14

Which of the following is the correct electron configuration for vanadium?

Accepted Answer

$[Ar] 4s^2 3d^3$

Question 15

Which of the following reactions is a combustion reaction?

Accepted Answer

Burning wood

Question 16

If a molecule has a bond angle of $90^{\circ}$, how many bonding groups and lone pairs can it have?

Accepted Answer

3 bonding groups and 2 lone pairs (T-shaped)

Question 17

Which of the following colors has the shortest wavelength on the visible light spectrum?

Accepted Answer

Violet

Question 18

Which of the following statements about alkali metals is FALSE?

Accepted Answer

Cesium ionization is lowered

Question 19

Which of the following is equivalent to the total heat content of a system?

Accepted Answer

Enthalpy

Question 20

Which element has an atomic number of 127?

Accepted Answer

Moscovium

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