Question 1

Which of the following statements best explains why metals conduct electricity?

Accepted Answer

Metals have delocalized electrons that can move freely throughout the lattice.

Question 2

A student measures the mass of a sample three times and gets values close to each other but far from the true value. This is an example of:

Accepted Answer

High precision, low accuracy

Question 3

Which of the following is the correct balanced equation for the combustion of liquid ethanol ($$\mathrm{C_2H_5OH_{(l)}}) in $$oxygen?

Accepted Answer

$$\mathrm{C_2H_5OH_{(l)} + 3 O_2_{(g)} \rightarrow 2 CO_2_{(g)} + 3 H_2O_{(l)}}$$

Question 4

Which of the following is a chemical property?

Accepted Answer

Chlorine is a good oxidizing agent in reactions with organic compounds.

Question 5

Which of the following best describes the difference between a compound and a homogeneous mixture?

Accepted Answer

A compound has a fixed composition and can only be separated by chemical means, while a homogeneous mixture has variable composition and can be separated by physical means.

Question 6

A sample of $$\mathrm{N_2O_4}$$ gas contains $$2.00 	imes 10$$^{23}$$ molecules and has a density of 1.91$$\ \mathrm{g/L}$$. What volume does this gas occupy?

Accepted Answer

$$35.0\ \mathrm{L}$$

Question 7

Which of the following is the correct net ionic equation for the reaction between $$\mathrm{Ba(OH)_2_{(aq)}}$$ and $$\mathrm{HCl_{(aq)}}$$?

Accepted Answer

$$\mathrm{2 H^+_{(aq)} + 2 OH^-_{(aq)} \rightarrow 2 H_2O_{(l)}}$$

Question 8

Which of the following best explains why octane ($$\mathrm{C_8H_{18}}) $$has a higher boiling point than propane ($$\mathrm{C_3H_8}$$)?

Accepted Answer

Octane has a larger molar mass and more surface area, leading to stronger London dispersion forces.

Question 9

Which of the following is the correct electron configuration (noble gas notation) for silver ($$\mathrm{Ag}$$, atomic number 47)?

Accepted Answer

$$[\mathrm{Kr}]\ 4d$$^{10}$$\ 5s^1$

Question 10

Which of the following statements about the Rutherford gold foil experiment is correct?

Accepted Answer

It showed that most of the atom is empty space and the positive charge is concentrated in a small nucleus.

Question 11

Which of the following is the correct formula for calcium bicarbonate?

Accepted Answer

$$\mathrm{Ca($$HCO_3$$)_2}$$

Question 12

Which of the following best describes the difference between a sigma ($$\sigma) $$bond and a pi ($$\pi) $$bond?

Accepted Answer

A $$\sigma$$ bond is formed by head-on overlap of orbitals, while a $$\pi$$ bond is formed by side-to-side overlap.

Question 13

Which of the following is the correct formula for iron(III) carbonate?

Accepted Answer

$$\mathrm{Fe_2$(CO_3$)_3}$$

Question 14

Which of the following is the correct net ionic equation for the reaction between $$\mathrm{NaOH_{(aq)}}$$ and $$\mathrm{CO_2_{(g)}}$$?

Accepted Answer

$$\mathrm{2 OH^-_{(aq)} + CO_2_{(g)} \rightarrow CO_3$^{2-}_{(aq)} + H_2O_{(l)}}$$

Question 15

Which of the following best explains why gases are compressible while liquids and solids are not?

Accepted Answer

Gas molecules are far apart compared to liquids and solids, allowing them to be compressed.

Question 16

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

Accepted Answer

$$\mathrm{(NH_4$)_2CO_3}$$

Question 17

Which of the following is the correct molecular formula for a compound with an empirical formula of $$\mathrm{CH_2O}$$ and a molar mass of $$120\ \mathrm{g/mol}$$?

Accepted Answer

$$\mathrm{C_4H_8O_4}$$

Question 18

Which of the following is the correct electron configuration (noble gas notation) for $$\mathrm{Cr} ($$chromium, atomic number 24)?

Accepted Answer

$$[\mathrm{Ar}]\ 4s^1$\ 3d^5$

General Chemistry I: Comprehensive Study Notes (Exam Review and Key Concepts)

Guida di studio - Domande di pratica

Study guide - Flashcard