Q: Which of the following best describes the difference between theoretical yield and percent yield?

Percent yield is calculated as $$\frac{\text{actual yield}}{\text{theoretical yield}} \times 100\%.$$

Question 1

Which of the following best describes the limiting reactant in a chemical reaction?

Accepted Answer

The reactant that determines the maximum amount of product that can be formed.

Question 2

A reaction releases 250 kJ of energy. Which term best describes this reaction?

Accepted Answer

Exothermic

Question 3

Given the reaction: $$2	ext{H}_2 + 	ext{O}_2 ightarrow 2	ext{H}_2	ext{O}$$, if you start with 4 moles of $$	ext{H}_2$$ and 2 moles of $$	ext{O}_2$$, what is the limiting reactant?

Accepted Answer

Neither, both are limiting.

Question 4

Which of the following best describes the difference between theoretical yield and percent yield?

Accepted Answer

Percent yield is calculated as $$\frac{	ext{actual yield}}{	ext{theoretical yield}} 	imes 100\%.$$

Question 5

Which of the following electron configurations represents a noble gas?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$

Question 6

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

Accepted Answer

Neon ($$	ext{Ne})$$

Question 7

Which statement about metallic character is correct?

Accepted Answer

Metallic character increases down a group.

Question 8

Which of the following molecules has a trigonal planar electronic geometry?

Accepted Answer

$$	ext{BF}_3$$

Question 9

What is the molecular geometry of $$	ext{NH}_3$$?

Accepted Answer

Trigonal pyramidal

Question 10

Which of the following best explains why $$	ext{H}_2	ext{O} is a $$polar molecule?

Accepted Answer

It has a bent geometry and a difference in electronegativity between H and O.

Question 11

Which of the following is the correct formula for calculating the energy of a photon?

Accepted Answer

$$E = h 
u$$

Question 12

Which of the following best describes the difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve transfer of electrons, covalent bonds involve sharing.

Question 13

Which molecule is expected to have a linear molecular geometry?

Accepted Answer

$$	ext{CO}_2$$

Question 14

A student mixes 10.0 g of $$	ext{NaCl}$$ with excess $$	ext{AgNO}_3 to $$produce $$	ext{AgCl}. If $$the theoretical yield is 24.0 g and the actual yield is 20.0 g, what is the percent yield?

Accepted Answer

$$83.3\%$$

Question 15

Which of the following best describes the role of electronegativity in determining bond polarity?

Accepted Answer

Bond polarity increases as the difference in electronegativity between atoms increases.

Question 16

Which of the following is the correct electron configuration for a chlorine atom?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^5$$

Question 17

Which of the following best describes the light emitted in the electromagnetic spectrum when an electron transitions from a higher to a lower energy level?

Accepted Answer

The light has a shorter wavelength and higher energy.

Question 18

Which of the following molecules is nonpolar despite having polar bonds?

Accepted Answer

$$	ext{CO}_2$$

Question 19

Which of the following is the correct Lewis structure for $$	ext{O}_2$$?

Accepted Answer

Two oxygen atoms connected by a double bond with four lone pairs.

Question 20

Which of the following best describes the molecular geometry of $$	ext{SO}_2$$?

Accepted Answer

Bent

Chemistry 110 Exam 3 Study Guide: Chemical Reactions, Electrons, and Bonding

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