What does the atomic number of an element represent?
the number of protons
100
What is the best description for iron rusting quickly when exposed to water and salt?
a chemical reaction
100
The use of which energy source causes the most damage to the environment
fossil fuels
100
Water moves through a plant from the roots to the leaves. This water then evaporates off the leaves into the atmosphere. This process is called____
transpiration
200
Different elements that are not chemically bonded together are elements, compounds or mixtures?
mixtures
200
How many carbon (C) atoms and oxygen (O) atoms are there in one molecule of CO2 (carbon dioxide)?
Carbon - 1
Oxygen - 2
200
True or False According to the Law of Conservation of Mass the mass of the product is equal to the mass of the reactants.
True
200
Which form of energy transformation would result in the emission of greenhouse gases?
fossil fuels (oil, coal, natural gas)
200
How does water get into an aquifer?
it moves underground until it reaches the water table
300
Which family of elements do not react with other elements?
Noble Gases
300
Magnesium changes color when ignited. What kind of a property is this?
chemical property
300
True or False The following equation is balanced
Mg(s) + 2O2(g) - 2MgO(s)
False
300
Which greenhouse gas most likely has the greatest impact on global warming?
carbon dioxide
300
Soil, sand and gravel are ____ because there are spaces between the rock particles for water to pass through.
permeable
400
Elements are most likely to react in the same manner in a chemical reaction when they belong to the same group or period?
the same group
400
The boiling point of a certain alcohol is 75 degrees Celsius. What kind of a property is this?
physical property
400
If you start with 40 grams of reactant in a chemical reaction, how much should the product be?
40 grams
400
Which type of energy resources are replenished more quickly than they are used?
renewable
400
What is the percentage of the amount of freshwater on Earth?
3%
500
Elements are arranged on the modern periodic table by...
-increasing number of neutrons?
-increasing number of electrons?
-increasing number of protons?
increasing number of protons
500
Which is the best evidence that a chemical change in matter has occurred?
a gas is produced (bubbles)
500
Is kool-aid an element, compound or mixture
mixture
500
Is hydropower a renewable or nonrenewable energy resource?
renewable
500
Upwelling moves the water of the deep ocean to the ocean’s surface. What else does upwelling move to the surface?