Question 1

Which of the following best describes the main goal of green chemistry?

Accepted Answer

To develop chemical processes that minimize waste and reduce environmental impact.

Question 2

Which of the following is a chemical property?

Accepted Answer

Reactivity with oxygen

Question 3

Which statement best explains why water is considered a compound?

Accepted Answer

It can be separated into hydrogen and oxygen by chemical means.

Question 4

According to Dalton’s atomic theory, which statement is correct?

Accepted Answer

Atoms combine in simple whole-number ratios to form compounds.

Question 5

Which subatomic particle determines the identity of an element?

Accepted Answer

Proton

Question 6

Which of the following pairs are isotopes?

Accepted Answer

12C and 14C

Question 7

Which element is most likely to form an ion with a 2+ charge?

Accepted Answer

Magnesium

Question 8

Which of the following best describes the trend in atomic radius across a period in the periodic table?

Accepted Answer

Atomic radius decreases from left to right.

Question 9

A molecule of ammonia (NH$$_3) $$contains:

Accepted Answer

One nitrogen atom and three hydrogen atoms

Question 10

Which of the following compounds is ionic?

Accepted Answer

NaCl

Question 11

What is the molar mass of glucose (C$$_6H$_{12}O$_6$$)? (C = 12.01 g/mol, H = 1.01 g/mol, O = 16.00 g/mol)

Accepted Answer

$$180.16 g/$$mol

Question 12

How many moles are in 36.0 grams of water (H$$_2O$$)? (H = 1.01 g/mol, O = 16.00 g/mol)

Accepted Answer

$$2.00$$ moles

Question 13

Which of the following best explains why ionic compounds tend to have high melting points?

Accepted Answer

They have strong electrostatic attractions between ions.

Question 14

Which of the following is a dipole-dipole interaction?

Accepted Answer

Attraction between HCl molecules

Question 15

Which of the following gases will diffuse fastest at room temperature?

Accepted Answer

H$$_2$$

Question 16

A sample of gas occupies 4.0 L at 1.0 atm and 300 K. What volume will it occupy at 2.0 atm and 300 K? (Assume ideal gas behavior.)

Accepted Answer

$$2.0 L$$

Question 17

Which of the following best explains why ice floats on water?

Accepted Answer

Hydrogen bonding causes ice to have an open, hexagonal structure.

Question 18

Which of the following is an example of a physical change?

Accepted Answer

Melting of ice

Question 19

Which of the following statements about the periodic table is correct?

Accepted Answer

Elements in the same group have similar chemical properties.

Question 20

Which of the following best describes a hydrogen bond?

Accepted Answer

A strong attraction between hydrogen and a highly electronegative atom like O, N, or F.

Introduction to Chemistry: Exam 1 Comprehensive Study Guide

Guida di studio - Domande di pratica