Semester One Review PART ONE Question Preview (ID: 34728)
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In a scientific experiment the variable that is manipulated by the scientist is called the ______________________.
a) dependent variable
b) independent variable
c) control
d) constant
Which of the following describes the molecules within a gas?
a) molecules are tightly packed together
b) molecules do not move
c) molecules are very spread out and move fast
d) molecules are jumbled and flow past each other
Which of these must form when two elements join together during a chemical change?
a) electrons
b) neutrons
c) a chemical bond
d) a heterogeneous mixture
Which of the following pieces of lab equipment should be used to measure mass in grams?
a) spring scale
b) graduated cylinder
c) triple beam balance
d) beaker
Which of the following pieces of lab equipment should be used to measure weight in newtons?
a) spring scale
b) graduated cylinder
c) triple beam balance
d) beaker
Which of the following pieces of lab equipment would be the best choice for measuring 100 ml of water?
a) 100ml Beaker
b) 25ml graduated cylinder
c) 25ml Beaker
d) 100ml graduated cylinder
The variable in a scientific experiment that is measured is called the ______________.
a) dependent variable
b) independent variable
c) control
d) constant
What happens to the molecules in a lump of butter as the butter melts?
a) the molecules spread farther apart and move faster
b) the molecules spread farther apart and move slower
c) the molecules pack together more closely and move slower
d) the molecules pack together more closely and move faster
Which of these is the smallest particle of matter?
a) compound
b) mixture
c) molecule
d) atom
An element appears in the far right column of the periodic table. What can you conclude about the element based on this information?
a) It is a solid.
b) It is a liquid.
c) It is a metalloid.
d) It is a nonmetal and a gas.
Which group of substances below contains only single elements?
a) C, NaCl, O2
b) H, He, CO
c) F, Fe, He
d) none of the above
Which is an example of a physical change?
a) burning methane gas to produce water and carbon dioxide
b) combining vinegar and baking soda to form a salt and water
c) the condensation of water vapor on the outside of a cold can of soda
d) the formation of silver sulfide when silver reacts with sulfur in the air
Which of the following is a compound?
a) Na
b) CO
c) Co
d) Al
When copper reacts with oxygen in the air, a color change takes place that turns the surface of the copper green. What type of change occurs to produce this color change?
a) dissolving
b) mixing
c) physical change
d) chemical change
Which of the following is a physical change?
a) dissolving salt in water
b) baking a cake
c) burning paper
d) Rust forming on a nail
The products in a chemical equation are located _____________.
a) on both sides of the equation
b) to the right of the arrow
c) to the left of the arrow
d) none of the above
A student observes actions that occurred in four different eggs. Which action describes ONLY a chemical change.
a) a dropped egg
b) a cut up egg
c) a stirred egg
d) a rotting egg
The reactants in a chemical equation are located _________________________.
a) on both sides of the equation
b) to the right of the arrow
c) to the left of the arrow
d) none of the above
Which of the following elements makes up about 21% of the Earth's atmosphere?
a) nitrogen
b) oxygen
c) helium
d) carbon
Which of the following is the most abundant element found in the Earth's atmosphere?
a) nitrogen
b) oxygen
c) helium
d) carbon
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