Q: What is the molarity of $$\mathrm{OH^-} in a $$solution with pH $$= 12$$?

$$1 \times 10$$^{-2}$$\ \mathrm{M}$$

Question 1

How many significant figures are in the measurement 34.0200 mi?

Accepted Answer

6

Question 2

A rock has a mass of 12.5 g and a density of $$2.03\ \mathrm{g/mL}. $$What is its volume in mL?

Accepted Answer

$$6.2\ \mathrm{mL}$$

Question 3

Which of the following is a homogeneous mixture?

Accepted Answer

Wine

Question 4

Which of the following is a chemical property?

Accepted Answer

Acidity

Question 5

How many joules of energy are required to raise the temperature of $$25\ \mathrm{g} of $$iron from $$12^\circ\mathrm{C} to$$ $$23^\circ\mathrm{C}$$? (Specific heat of iron = $$0.231\ \mathrm{J/g^\circ C})$$

Accepted Answer

$$63.5\ \mathrm{J}$$

Question 6

What is the balanced chemical equation for the reaction of $$\mathrm{C_5H_{12}}$$ with $$\mathrm{O_2$} to $$form $$\mathrm{CO_2$}$$ and $$\mathrm{H_2O}$$?

Accepted Answer

$$\mathrm{C_5H_{12}} + 8\ \mathrm{O_2$} \rightarrow 5\ \mathrm{CO_2$} + 6\ \mathrm{H_2O}$$

Question 7

How many moles of $$\mathrm{H_2SO_4}$$ are present in $$23\ \mathrm{g} of$$ $$\mathrm{H_2SO_4}$$? (Molar mass $$= 98\ \mathrm{g/mol})$$

Accepted Answer

$$0.23\ \mathrm{mol}$$

Question 8

A compound is found to be $$60\% C$$, $$13\% H$$, and $$27\% O by $$mass. If its molecular weight is $$360\ \mathrm{g/mol}$$, what is its molecular formula?

Accepted Answer

$$\mathrm{C$$_{18}$$H_{48}O_6$}$$

Question 9

What is the electron configuration of $$\mathrm{Na^+}$$?

Accepted Answer

$$1s^22s^22$p^6$$

Question 10

What is the shape and bond angle of $$\mathrm{$$AlH_3$$}$$?

Accepted Answer

Trigonal planar, $$120^\circ$$

Question 11

A $$600\ \mathrm{mL}$$ solution contains $$12.3\ \mathrm{g} of $$NaOH. What is the molarity of the solution? (Molar mass of NaOH = $$40.0\ \mathrm{g/mol})$$

Accepted Answer

$$0.51\ \mathrm{M}$$

Question 12

How many moles of oxygen atoms are in $$3$$ moles of $$\mathrm{Ca(NO_3$)_2}$$?

Accepted Answer

$$18$$

Question 13

A $$300\ \mathrm{mL}$$ sample of gas at $$730\ \mathrm{mmHg} is $$compressed to $$690\ \mathrm{mmHg}. $$What is the new volume? (Assume temperature is constant.)

Accepted Answer

$$317\ \mathrm{mL}$$

Question 14

Which intermolecular force is the strongest in $$\mathrm{C_4H_9OH}$$?

Accepted Answer

Hydrogen bonding

Question 15

What is the net ionic equation for the reaction between $$\mathrm{$$AgNO_3$$(aq)}$$ and $$\mathrm{NaCl(aq)}$$?

Accepted Answer

$$\mathrm{Ag^+ (aq) + Cl^- (aq) \rightarrow AgCl (s)}$$

Question 16

A $$500\ \mathrm{mL}$$ container at STP contains methane ($$\mathrm{CH_4$}). $$How many grams of $$\mathrm{CH_4$}$$ are present? (Molar mass $$= 16\ \mathrm{g/mol}$$, $$1\ \mathrm{mol}$$ gas at STP $$= 22.4\ \mathrm{L})$$

Accepted Answer

$$0.36\ \mathrm{g}$$

Question 17

What is the molarity of $$\mathrm{OH^-} in a $$solution with pH $$= 12$$?

Accepted Answer

$$1 	imes 10$$^{-2}$$\ \mathrm{M}$$

Question 18

How many neutrons are in $$\mathrm{Ca}$$-$$42$$?

Accepted Answer

22

Question 19

When $$\mathrm{Mg}$$-$$24$$ undergoes alpha emission, what is the daughter particle?

Accepted Answer

$$\mathrm{Ne}$$-$$20$$

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