Chemistry test 3/30/21

Which of the following might be included in a chemical reaction?

All of the above

KBr (aq) + AgNO3 (aq) → KNO3 (aq) + AgBr (s) In the chemical reaction above, what state is KBr in?

Aqueous

"Solid carbon reacts with oxygen gas to produce carbon dioxide gas." Which chemical equation correctly translates the description above?

C (s) + O2 (g) → CO2 (g)

"Aqueous calcium hydroxide reacts with carbon dioxide gas to produce solid calcium carbonate and liquid water." Which chemical equation correctly translates the description above?

Ca(OH)2 (aq) + CO2 (g) → CaCO3 (s) + H2O (l)

To balance a chemical equation, numbers called _____ are used.

Coefficients

A chemical — is a shorthand way to sum up what occurs in a chemical reaction.

Equation

Chemical equations consist of the chemical formulas of the reactants on the right and the chemical formulas of the products on the left.

False

In a symbolic equation, chemical names are used for reactants and products.

False

The symbol (aq) is used to denote the gaseous phase of a reactant or a product.

False

NaOH (aq) + HCl (aq) → NaCl (aq) + H2O (l) In the chemical reaction above, which is in liquid state?

H2O

Ammonium chloride + Potassium hydroxide → Potassium chloride + Ammonia gas + Water Which of the following chemical reactions correctly interprets the chemical word equation above?

NH4Cl (aq) + KOH (aq) → KCl (aq) + NH3(g) + H2O (l)

The process of burning means to react a substance with?

Oxygen

CaCO3 (s) + 2HCl (aq) → CaCl2 (aq) + CO2 (g) + H2O (l) In the chemical reaction above, what states are CaCO3 and H2O in, respectively?

Solid Liquid

What is the "major drawback" to using word equations?

Word equations are not quantitative.

What does the symbol NaCl(aq) mean?

a water-based solution of sodium chloride

Which is NOT a chemical reaction?

water seeping through a pot of soil

Which of the following chemical equations is balanced?

4Fe+3O2→2Fe2O3

Which chemical(s) are reactants in the following chemical equation? C + O2 → CO2

C O2

"Carbon dioxide gas reacts with liquid water to produce aqueous carbonic acid." Which chemical equation correctly translates the description above?

CO2 (g) + H2O (l) → H2CO3 (aq)

A compound or material formed by a chemical reaction is known as the—— of the reaction

Product

Chemical reactions yield?

Products

The substances that begin a chemical reaction are called _____.

Reactant

The materials or compounds that are changed into new compounds in a chemical reaction are known as

Reactants

Silver exposed to sulfur turns blacks.The compound formed is—-and is commonly referred to as tarnish?

Silver sulfide

An equation that shows only the chemical formulas without anything to indicate relative amounts is called a?

Skeleton equation

Given the word equations below: Sodium+Water->Sodium hydroxide+hydrogen What are the reactants?

Sodium and Water

In a chemical reaction, the substances which are present at the beginning are called reactants.

True

Instead of an equal sign, a chemical equation uses a arrow, which is called a yield sign.

True

The substances present before a reaction begins are called reactants, while the substances formed by the reaction are called products.

True

The symbol (s) is used to denote the solid phase of a reactant or a product.

True

True or False: 2SO2 + O2 → 2SO3 In the chemical reaction above, the coefficient of SO3 is 2.

True

What products are always made when any carbon-based fuel is burned in the presence of oxygen?

carbon dioxide and water

Describe in words the chemical reaction represented by the following chemical equation: 2NO2 → 2O2 + N2

nitrogen dioxide produces oxygen and nitrogen

What is indicated by a letter in parentheses after a chemical formula, such as (s)?

the physical state of the substance