Homogeneous Solution Quiz Questions
Objectives review for final exam.
- 1.For the following chemical equation _ Na + _ O2 --> _ Na2O2, the coefficients that balance the equation are:
- A.
1,1,1
- B.
2,1,1
- C.
2,2,2
- D.
2,1,2
- 2.Water is referred to as the universal solvent because
- A.
It is found throughout the universe.
- B.
All known substances dissolve in water.
- C.
Many different substances dissolve in water.
- D.
It covers more than half of the Earth's surface.
- 3.Which of the following is a homogeneous mixture?
- A.
Salad dressing
- B.
Gelatin
- C.
Rubbing alcohol
- D.
Orange juice with pulp
- 4.A heterogeneous mixture is one that is not
- A.
Uniform throughout.
- B.
Easily mixed together.
- C.
Made of two or more liquids.
- D.
Edible by humans.
- 5.Which of the following is an example of a heterogeneous mixture?
- A.
Salt water
- B.
Vinegar
- C.
Sugar solution
- D.
Mayonnaise
- 6.The equation identifies the ___________ (starting materials) and _______________(resulting substance),
- A.
Products, reactants
- B.
Reactants, phases
- C.
Reactants, products
- D.
Reactants, formulas
- 7.In a balanced chemical reaction, the total mass of the products always equals the
- A.
Molar mass of reactants
- B.
Atomic mass of reactants
- C.
Total mass of reactants
- D.
Proportional masses of the reactants
- 8.In the reaction 2H2O ---.>2H2 + O2, if you start with 2 mol of water, how many moles of hydrogen gas are produced?
- A.
1 mol
- B.
2 mol
- C.
3 mol
- D.
4 mol
- 9.A balanced chemical equation shows the proportions of reactants and products necessary for
- A.
The reaction to occur.
- B.
Mass to be conserved
- C.
Energy use to be minimized.
- D.
Electrolysis to occur
- 10.Which of the following is an example of a decomposition reaction?
- A.
Photosynthesis
- B.
Digestion
- C.
Respiration
- D.
Exchange of ions between two compounds
- 11.What kind of reaction occurs when potassium is placed in water? K + H2O ---- KOH + H2
- A.
Single displacement reaction
- B.
Double displacement reaction
- C.
A decomposition reaction
- D.
Electrolysis
- 12.A synthesis reaction is a reaction between at least two compounds in which
- A.
One breaks down into at least two products.
- B.
A compound is decomposed by an electric current.
- C.
A compound burns in the presence of oxygen.
- D.
A new, more complex compound is formed.
- 13.What happens in a chemical reaction?
- A.
Atoms are destroyed
- B.
Atoms are created
- C.
Atoms are heated or cooled
- D.
Atoms are rearranged
- 14.Covalent bonds are formed between
- A.
Iones
- B.
Metal atoms
- C.
Nonmetal atoms
- D.
Compounds
- 15.An ionic bond is a bond that forms between
- A.
Atoms with opposite charges
- B.
Atoms with neutral charge
- C.
One atom's nucleus and another atom's electrons.
- D.
The electrons of two different atoms
- 16.Each molecule of table sugar, C12H22O11, contains
- A.
0 atoms of carbon
- B.
11 atoms of carbon
- C.
6 atoms of carbon
- D.
12 atoms of carbon
- 17.A compound differs from a mixture because it
- A.
Always remains frozen even at high temperatures.
- B.
Is formed from two cations.
- C.
Always contains the same elements in the same proportion.
- D.
Can form only in the presence of heat energy.
- 18.An atom's mass number equals the number of
- A.
Protons plus the number of electrons
- B.
Protons plus the number of neutrons
- C.
Protons
- D.
Neutrons
- 19.Grinding quartz crystals down to produce sand is an example of a
- A.
Change of state
- B.
Chemical change
- C.
Chemical reaction
- D.
Physical change
- 20.Lead has a density of 11.3 g/cm3. What is the volume of a block of lead with a mass of 282.5 g?
- A.
2.5cm3.
- B.
25cm3.
- C.
250cm3.
- D.
2500cm3.
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