Stem 9 Practice Final

67 Questions | By J_wells | Updated: Mar 20, 2022 | Attempts: 119

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Sit back, relax and have fun with this Physical Science Practice quiz.

Questions and Answers

1.

Which of the following units is an SI base unit?
- A.
  
  Centimeter
- B.
  
  Kilogram
- C.
  
  Cubic meter
- D.
  
  Liter
2.

In a controlled experiment,
- A.
  
  The outcome is controlled.
- B.
  
  Results are obtained by computer models.
- C.
  
  One variable is fixed while all others are changed.
- D.
  
  One variable is changed while all others remain fixed.
3.

Matter is
- A.
  
  Any visible solid that has mass.
- B.
  
  Any liquid that takes up space and has mass.
- C.
  
  Anything that takes up space and has mass.
- D.
  
  Any liquid or solid that takes up space.
4.

What i the chemical formula for iron (III) oxide?
- A.
  
  Fe2+
- B.
  
  NaCl
- C.
  
  I2
- D.
  
  Fe2O3
5.

Which of the following is a mixture?
- A.
  
  Air
- B.
  
  Salt
- C.
  
  Water
- D.
  
  Sulfur
6.

Compounds and elements are
- A.
  
  Always solids.
- B.
  
  Mixtures.
- C.
  
  Pure substances.
- D.
  
  Dense.
7.

Which of the following is a physical change?
- A.
  
  Melting ice cubes
- B.
  
  Burning paper
- C.
  
  Rusting iron
- D.
  
  Burning gasoline
8.

If you add oil to water and shake the two liquids together, you will form a
- A.
  
  Heterogeneous mixture.
- B.
  
  Homogeneous mixture.
- C.
  
  Miscible liquid.
- D.
  
  Pure substance.
9.

During which change of state do atoms or molecules become more ordered?
- A.
  
  Boiling
- B.
  
  Condensation
- C.
  
  Melting
- D.
  
  Sublimation
10.

Which of the following describes what happens as the temperature of a gas in a balloon increases?
- A.
  
  The volume of the gas increases and the speed of the particles in increases.
- B.
  
  The speed of the particles decreases.
- C.
  
  The volume decreases.
- D.
  
  The pressure decreases.
11.

Materials that can flow to fit their containers include
- A.
  
  Gases.
- B.
  
  Liquids.
- C.
  
  Both gases and liquids.
- D.
  
  Neither gases or liquids.
12.

Which statement is NOT true of Bohr's model of the atom?
- A.
  
  The nucleus can be compared to the sun.
- B.
  
  Electrons orbit the nucleus.
- C.
  
  An electron's path is not known exactly.
- D.
  
  Electrons exist in energy levels.
13.

According to the moderns model of the atom,
- A.
  
  Moving electrons form an electron cloud.
- B.
  
  Electrons and protons circle neutrons.
- C.
  
  Neutrons have a positive charge.
- D.
  
  The number of protons an atom has varies.
14.

If an atom has a mass of 11 amu and contains five electrons, it's atomic number must be
- A.
  
  55.
- B.
  
  16.
- C.
  
  6.
- D.
  
  5.
15.

Which statement about atoms of elements in the same group of the periodic table is true?
- A.
  
  They have the same number of protons.
- B.
  
  They have the same mass number.
- C.
  
  They have similar chemical properties.
- D.
  
  They have the same number of total electrons.
16.

The majority of elements in the periodic table are
- A.
  
  Nonmetals.
- B.
  
  Conductors.
- C.
  
  Synthetic.
- D.
  
  Noble gases.
17.

An atom of which of the following elements is unlikely to form a positively charged ion?
- A.
  
  Potassium, K
- B.
  
  Selenium, Se
- C.
  
  Barium, Ba
- D.
  
  Silver, Ag
18.

Which of the following statements about krypton is NOT true?
- A.
  
  Its molar mass is 83.79 g/mol Kr.
- B.
  
  Its atomic number is 36.
- C.
  
  One mole of krypton atoms has a mass of 41.90 g.
- D.
  
  It is a noble gas.
19.

Compounds are different from mixtures because
- A.
  
  Compounds are held together by chemical bonds.
- B.
  
  Each substance in a compound maintains its own properties.
- C.
  
  Each original substance in a compound remains chemically unchanged.
- D.
  
  Mixtures are held together by chemical bonds.
20.

Which substance has ionic bonds?
- A.
  
  CO
- B.
  
  CO2
- C.
  
  KCl
- D.
  
  O2
21.

In an exothermic reaction,
- A.
  
  Energy is conserved.
- B.
  
  The formation of bonds in the product releases more energy than is required to break the bonds in the reactants.
- C.
  
  Energy is released as bonds form.
- D.
  
  All of the above.
22.

Which of the following is a homogeneous mixture?
- A.
  
  Tossed salad
- B.
  
  Soil
- C.
  
  Salt water
- D.
  
  Vegetable soup
23.

A solution is _________ if it contains as much dissolved solute as it will hold under a given set of conditions.
- A.
  
  Saturated.
- B.
  
  Dilute.
- C.
  
  Supersaturated.
- D.
  
  Concentrated
24.

Gases are more soluble in liquids when the pressure is __________ and the temperature is _________.
- A.
  
  High, high
- B.
  
  High, low
- C.
  
  Low, high
- D.
  
  Low, low
25.

Which ions does an acid form in solution?
- A.
  
  Oxygen
- B.
  
  Hydronium
- C.
  
  Hydroxide
- D.
  
  Sulfur