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
