General
Writing Chemical Formulas
Writing Chemical Equations
Balancing Equations
Miscellaneous
100
The reactants and the products of this chemical reaction: oxygen + hydrogen yields water
Reactants are oxygen and hydrogen; product is water
100
Write the chemical formula for: calcium carbonate.
What is CaCO3
100
Write the unbalanced equation for: potassium + water yields hydrogen + potassium hydroxide.
What is K + H2O yields H2 + KOH
100
Balance this equation: Na + MgF2 yields NaF + Mg
What is 2Na + MgF2 yields 2NaF + Mg
100
Matter is neither created nor destroyed in a chemical reaction and mass is neither gained nor lost through a chemical reaction. This is called the ___.
What is Law of Conservation of Matter?
200
The addition of ___ in some form is often necessary to initiate a chemical reaction.
What is energy?
200

Write the formula for magnesium nitrate.

What is Mg(NO3)2

200
Write the unbalanced equation for: iron + oxygen yields iron (III) oxide.
What is Fe + O2 yields Fe2O3.
200
Balance this equation: K + H2O yields H2 + KOH
What is 2K + 2H2O yields H2 + 2KOH
200
In a chemical reaction, the number of molecules of a given substance is indicated by the use of ____.
What is a coefficient?
300
Chemical reactions occurs because of how the outermost electrons are arranged in the atoms involved. These outermost electrons are called ___.
What are valence electrons?
300
Write the formula for nickel (III) oxide.
What is Ni2O3
300

Write the unbalanced chemical equation for: copper + sulfur yields copper (I) sulfide.

What is Cu + S yields Cu2S.

300
Balance this equation: CH4 + O2 yields CO2 + H2O
What is CH4 + 2O2 yields CO2 + 2H2O.
300
The symbol (l) means ____in a chemical equation.
What is liquid?
400
The four signs of a chemical reaction are...
What is a) color change, b) gas produced, c) solid forms, and d) energy change (heat is absorbed or released)
400
Write the formula for iron (II) oxide.
What is FeO.
400
Write the unbalanced chemical equation for: sodium chloride (solid) yields sodium gas and chlorine gas
What is NaCl (s) yields Na (g) + Cl2 (g)
400

Balance this equation: Al + O2 yields Al2O3.

What is 4Al + 3O2 yields 2Al2O3.

400
Name three examples of chemical reactions.
Answers will vary.
500
When a solid forms in a chemical reaction, that solid is called a ___.
What is a precipitate?
500
Write the formula for mercury (II) hydroxide.
What is Hg(OH)2
500
Write the unbalanced chemical equation for: magnesium + hydrogen chloride yields magnesium chloride and hydrogen.
What is Mg + HCl yields MgCl2 + H2.
500

Balance this: 

Zn  +  HNO3  →  Zn(NO3)2  +  H2O  +  N2O
4 Zn +  10 HNO3  →  4 Zn(NO3)2  +  5 H2O  +  N2O
500
The difference between (l) and (aq) is ___.
What is (l) means the element is in a liquid state; (aq) means the element or compound is dissolved in water (can be a gas OR solid dissolved in water)
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