Introduction to Chemistry

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Questions and Answers

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

Temperature (correct)
Mass
Volume
Length

In a chemical reaction, if substance A is the limiting reactant, what does this imply?

Substance A is a catalyst.
Substance A is present in excess.
Substance A is completely consumed in the reaction. (correct)
Substance A is the product with the highest yield.

What is the correct name for the ionic compound $NaCl$?

Sodium chlorate
Sodium chloride (correct)
Monosodium monochloride
Sodium chlorite

When balancing a chemical equation, what principle must be followed?

The number of atoms of each element must be the same on both sides of the equation. (C) Signup and view all the answers

Which of the states of matter has a definite volume but takes the shape of its container?

Liquid (C) Signup and view all the answers

If a chemical reaction has a theoretical yield of 25.0 grams of product and an actual yield of 20.0 grams, what is the percent yield?

80% (C) Signup and view all the answers

What does the coefficient in a balanced chemical equation represent?

The number of moles of each substance (D) Signup and view all the answers

What is the molar mass of $H_2O$?

18.0 g/mol (A) Signup and view all the answers

Which of the following best describes the relationship between molality and temperature?

Molality is independent of temperature because it is based on mass, not volume. (C) Signup and view all the answers

A solution has a pH of 3. Which of the following statements is most accurate?

The solution has a high concentration of hydrogen ions (H+). (B) Signup and view all the answers

In a redox reaction, a substance that loses electrons is said to be and acts as a .

oxidized; reducing agent (C) Signup and view all the answers

Which type of chemical bond involves the sharing of electrons within a 'sea' of electrons?

Metallic bond (C) Signup and view all the answers

For an endothermic reaction, which statement is always true?

The enthalpy change (ΔH) is positive. (A) Signup and view all the answers

A gas occupies 10.0 L at standard temperature and pressure (STP). If the amount of gas is doubled, what is the new volume, assuming temperature and pressure remain constant?

20.0 L (A) Signup and view all the answers

Which of the following factors does NOT affect the rate of a chemical reaction?

The color of the reactants (B) Signup and view all the answers

Consider the reversible reaction: $A + B ightleftharpoons C$. At equilibrium, what is true about the rates of the forward and reverse reactions?

The rates of the forward and reverse reactions are equal. (D) Signup and view all the answers

What type of radioactive decay results in the emission of a helium nucleus?

Alpha decay (A) Signup and view all the answers

Which functional group contains a carbon atom double-bonded to an oxygen atom and single-bonded to an -OH group?

Carboxylic acid (C) Signup and view all the answers

If a reaction at equilibrium shifts to the right after the addition of heat, what can be concluded?

The forward reaction is endothermic. (A) Signup and view all the answers

Which of the following is a characteristic of a strong acid?

It completely dissociates in water. (A) Signup and view all the answers

In a bomb calorimeter, a reaction occurs and the temperature of the calorimeter increases. What type of reaction has occurred?

An exothermic reaction (A) Signup and view all the answers

Which gas law explains why a balloon expands when heated?

Charles's Law (A) Signup and view all the answers

Which of the following organic compounds does NOT contain oxygen?

Alkane (A) Signup and view all the answers

Flashcards

Chemistry

The study of matter, its properties, and how it changes.

Matter

Anything that has mass and takes up space.