Chemistry Reactions and Concepts Quiz

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What occurs during a chemical change?

Only heat is involved without any substance transformation.

The structural formula of a substance remains unchanged.

A substance is converted into new substances with different properties. (correct)

A substance retains its original properties.

Which of the following best describes a combination reaction?

It splits a substance into two or more simpler substances.

It releases energy by burning a carbon-containing compound.

It combines two or more substances into a single new substance. (correct)

It involves the swapping of positive ions between two reactants.

What happens in a double replacement reaction?

One element in a compound replaces another element.

Substances combine to form one product.

A carbon compound reacts with oxygen.

Positive ions of two reactants swap places. (correct)

What defines oxidation in oxidation-reduction reactions?

The loss of electrons. Signup and view all the answers

Which scenario represents reduction in a chemical reaction?

Gain of electrons by a substance. Signup and view all the answers

What does VESPR stand for in the context of electron groups around a central atom?

Valence Shell electron Pair repulsion theory Signup and view all the answers

How many electron groups around a central atom result in a tetrahedral molecular shape?

4 groups Signup and view all the answers

What type of bond forms when the electronegativity difference between two atoms is very high?

Polar bond Signup and view all the answers

Which statement is true regarding intermolecular forces and boiling/melting points?

Stronger intermolecular forces result in higher boiling/melting points Signup and view all the answers

What type of intermolecular force can occur due to temporary dipoles in nonpolar molecules?

Dispersion forces Signup and view all the answers

What is the definition of theoretical yield?

The mass amount of a product that could be produced based on a balanced equation. Signup and view all the answers

How do you determine the limiting factor between two reactants?

By using mole-to-mole ratios of the reactants and products. Signup and view all the answers

What does percent yield measure?

The efficiency of a reaction based on actual vs. theoretical yield. Signup and view all the answers

If a reaction has an actual yield of 50 grams and a theoretical yield of 100 grams, what is the percent yield?

25% Signup and view all the answers

What occurs when a reaction does not go to completion?

The amount produced is less than predicted. Signup and view all the answers

What is the significance of a limiting reactant in a chemical reaction?

It is the reactant that limits the amount of product formed. Signup and view all the answers

How many particles are in one mole of a substance?

6.02 x 10^23 Signup and view all the answers

What is the correct procedure to convert grams of substance A to grams of substance B?

Convert grams of A to moles, then use the mole-to-mole ratio, and convert moles of B to grams. Signup and view all the answers

What does the molar mass of an element equate to?

The weight of one mole of that element in grams. Signup and view all the answers

What must be done to determine the molar mass of a chemical compound?

Add all the atomic masses of the elements present in the compound. Signup and view all the answers

What are homogeneous mixtures of two or more substances called?

Solutions Signup and view all the answers

Which type of electrolyte dissociates fully in water and can conduct electric currents?

Strong electrolytes Signup and view all the answers

What is the term for the maximum amount of solute that can dissolve in a solvent?

Solubility Signup and view all the answers

What happens to weak electrolytes when dissolved in water?

They partially dissociate into a small number of ions Signup and view all the answers

Which of the following substances can be classified as a nonelectrolyte?

Sugar Signup and view all the answers

What is a characteristic property of Arrhenius acids?

Turn blue litmus paper red Signup and view all the answers

In the Bronsted-Lowry theory, what role does an acid play in a reaction?

It donates $H^{+}$ ions. Signup and view all the answers

Which statement is true regarding strong acids?

They completely ionize in aqueous solutions. Signup and view all the answers

What is the correct pH of a neutral solution?

7 Signup and view all the answers

What effect does an increase in $H^{+}$ ions have on pH?

pH decreases Signup and view all the answers

What is the pH of pure water?

7 Signup and view all the answers

What happens when $H^{+}$ concentration is greater than $OH^{-}$ concentration?

The solution becomes acidic. Signup and view all the answers

Which ions are equal in a neutral solution?

$H^{+}$ and $OH^{-}$ Signup and view all the answers

When is water considered basic?

When $OH^{-}$ > $H^{+}$ Signup and view all the answers

What is produced when an $H^{+}$ ion is transferred from one water molecule to another?

$H_{3}O^{+}$ Signup and view all the answers

What characterizes a saturated solution?

Has more solute than the maximum amount allowed Signup and view all the answers

How does temperature affect solid solubility?

Solid solubility typically increases as temperature increases Signup and view all the answers

What does the formula for mass percentage represent?

The proportion of solute in relation to the total mass of the solution Signup and view all the answers

What happens to concentration during dilution?

Concentration decreases as water is added Signup and view all the answers

In the dilution formula $C_1V_1 = C_2V_2$, what does $C_1$ represent?

Initial concentration of the solution before dilution Signup and view all the answers