Question 1

A sample of 0.50 mol of hydrogen gas reacts with 1.0 mol of oxygen gas to form water. What is the limiting reactant and how many moles of water are produced?

$$2H_2(g) + O_2$(g) \rightarrow 2H_2O(g)$$

Accepted Answer

Hydrogen is limiting; 0.50 mol $$H_2O$$ produced

Question 2

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 3

Which of the following orbital-filling diagrams violates Hund's rule?

Accepted Answer

A diagram with two electrons paired in one $$p$$ orbital before all $$p$$ orbitals have one electron

Question 4

A 5.00 g sample of a metal at 100.0 $$^\circC is $$placed in 100.0 g of water at 25.0 $$^\circC. $$The final temperature is 27.0 $$^\circC. $$What is the specific heat capacity of the metal? (Assume $$c_{water} = 4.18 \text{ J/g}^\circC)$$

Accepted Answer

$$0.20 \text{ J/g}^\circC$$

Question 5

Which of the following molecules contains the most easily broken carbon-carbon bond?

Accepted Answer

$$CH_2=CH-CH$$=$$CH_2$$

Question 6

Which of the following best describes the electron geometry around the central atom in $$BF_3$$?

Accepted Answer

Trigonal planar

Question 7

A student measures the mass of a piece of silver as 52.0 g. If the density of silver is $$10.5 \text{ g/cm}^3$$, what is the volume of the silver sample?

Accepted Answer

$$4.95 \text{ cm}^3$$

Question 8

Which of the following is the correct net ionic equation for the reaction between $$CaCl_2(aq$$)$$ and Na_2CO_3(aq$$)$$?

Accepted Answer

$$Ca^{2+}(aq$$) + $$CO_3$$^{2-}(aq) \rightarrow $$CaCO_3(s$$)$$

Question 9

Which of the following elements has the highest first ionization energy?

Accepted Answer

Cl

Question 10

Consider the reaction: $$2KClO_3(s) ightarrow 2KCl(s) + 3O_2(g). If 12.0 g of$$ $$KClO_3 is $$decomposed, how many grams of $$O_2$$ are produced? ($$M_{$$KClO_3$$} = 122.6 \text{ g/mol})$$

Accepted Answer

$$3.14 \text{ g}$$

Question 11

Which of the following is the correct electron configuration for $$Cr ($$chromium)?

Accepted Answer

$$[Ar] 4s^1$ 3d^5$

Question 12

Which of the following statements about the photoelectric effect is correct?

Accepted Answer

Electrons are emitted only if the frequency of incident light is above the threshold frequency.

Question 13

Which of the following is the correct formula for ammonium sulfate?

Accepted Answer

$$(NH_4$)_2SO_4$$

Question 14

Which of the following molecules is polar?

Accepted Answer

$$NH_3$$

Question 15

Which of the following is the correct name for $$Al_2O_3$$?

Accepted Answer

Aluminum oxide

Question 16

A compound has a molecular mass of 180 g/mol. The empirical formula was determined to be $$CH_2O. $$What is the molecular formula of the compound?

Accepted Answer

$$C_6H_{12}O_6$

Question 17

Which of the following best describes the hybridization of the central atom in $$SF_6$$?

Accepted Answer

$$sp^3d^2$

Question 18

Which of the following is the correct formula for carbon disulfide?

Accepted Answer

$$CS_2$$

Question 19

Which of the following is a chemical change?

Accepted Answer

Rusting of iron

Question 20

Which of the following is the correct electron configuration for $$I ($$iodine)?

Accepted Answer

$$[Kr] 5s^2$ 4d$$^{10}$$ 5p^5$

General Chemistry I: Comprehensive Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard