Reaction Rates, Indicators And Toxic Chemicals Question Preview (ID: 36887)


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The elements in a vertical column are called
a) periods
b) stalks
c) rows
d) families

A material that can be hammered into shapes or rolled into flat sheets is called
a) ductile
b) reactive
c) malleable
d) corrosive

Who developed the first periodic table?
a) Mr. Groce
b) Mrs. Lopez
c) Mrs. Vaughn
d) Demetri Mendeleev

In the modern periodic table, the elements are arranged by
a) increasing atomic mass
b) increasing atomic number
c) decreasing number of valence electrons
d) decreasing atomic mass

How many energy levels are in Bromine?
a) 2
b) 3
c) 4
d) 5

What elements are most useful for semiconductors in computers?
a) metals
b) metalloids
c) non-metals
d) All elements can be use as semiconductors

A reaction that releases energy is called a(n)
a) temperputic reaction
b) exothermic reaction
c) endothermic reaction
d) reductive reaction

If I add vinegar to baking soda, a chemical reaction takes place and carbon dioxide is produced. Which of the following will increase the speed of the chemical reaction?
a) increase the temperature of the vinegar
b) decrease the concentration of the vinegar
c) decrease the surface area of the baking soda
d) use an inhibitor

Which element below is the most reactive?
a) Silver
b) Tungsten
c) Mercury
d) Potassium

A reaction that absorbs energy is called a(n)
a) exothermic reaction
b) reductive reaction
c) terperputic reaction
d) endothermic reaction

Crushing up a tablet before dissolving it in water would
a) decrease the temperatuer
b) increase the surface area
c) decrease the concentration
d) decrease the surface area

The capitol building in Atlanta, Georgia is covered in gold foil. It takes only 2.2 kilograms of gold to cover the entire top of the building. Why does it take such a small amount of gold?
a) Because gold is ductile
b) Because gold is very reactive
c) Because gold is malleable
d) Because gold has a low density

Why is copper used in electrical wiring?
a) Because it is malleable and a poor conductor of electricity
b) Because it is a good insulator
c) Because it is ductile and a good conductor of electricity
d) Because it is a semiconductor

Which below is not a factor that would affect the rate of reaction?
a) color
b) concentration
c) surface area
d) temperature

The energy needed to start a chemical reaction.
a) activation energy
b) inhibitor energy
c) enzymes
d) reactant energy

Which element has chemical properties most like Gallium?
a) Zinc
b) Germanium
c) Arsenic
d) Aluminum

Which element is most likely a good insulator?
a) Copper
b) Calcium
c) Silicon
d) Chlorine

How many periods is in the modern periodic table?
a) 4
b) 5
c) 6
d) 7

If you add zinc to hydrochloric acid, bubble of hydrogen gas forms. What will most likely increase the rate of bubble formation?
a) using less zinc.
b) using powdered zinc.
c) cooling the hydrochloric acid
d) diluting the hydrochloric acid

Which answer below will not cause an increase in the rate of reaction?
a) An increase in the surface area.
b) An inhibitor
c) An increase in temperature
d) A catalyst

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