The Scientific Method
The Periodic Table
Chemical Bonds
Chemical Reactions
Water and Solutions
100
A testable explanation of an observation.
What is a Hypothesis.
100
The smallest, individual subunits of an element.
What is atom.
100
The particles of an atom involved in chemical bonding.
What is an Electron.
100
Located on the left side of a chemical reaction.
What is Reactants.
100
Molecules that have an unequal distribution of charges, like water, are called ___________ molecules.
What is Polar.
200
A factor that remains the same during an experiment while the independent and dependent variables change.
What is a Constant.
200
The three particles located within the individual atoms of an element.
What is Proton, Neutron, and Electron.
200
Occur when two atoms share a pair of electrons.
What is a Covalent Bond.
200
Enzymes speed up the rate of chemical reactions by lowering the _____________.
What is Activation Energy.
200
Are weak van der Waals forces that occur between the hydrogen and oxygen atoms of water molecules.
What is Hydrogen Bonds.
300
We want to observe how different temperatures affect student alertness in the classroom. The changing temperature is the ______________ variable.
What is Independent.
300
The atomic number of an element represents the number of _________ in the nucleus of an atom.
What is Protons.
300
An atom that has lost or gained electrons, and therefore carries an electric charge.
What is an Ion.
300
The energy demonstrated in the reactants of a chemical reaction is greater than the energy in the products in ___________ reactions.
What is Exothermic.
300
If a teaspoon of salt is dissolved in a beaker of water, the salt is the __________ of the homogeneous mixture.
What is Solute.
400
We want to observe how different temperatures affect student alertness in the classroom. Student alertness is the _______________ variable.
What is Dependent.
400
Are individual atoms of an element that have the same number of protons and electrons, but differ in their number of neutrons.
What is Isotopes.
400
Attractions that occur between negative and positive regions of molecules that are close to each other.
What is van der Waals forces.
400
The law of ____________________ dictates that matter cannot be created or destroyed; thus, chemical equations must be balanced.
What is Conservation of Mass.
400
The pH of the human stomach is approximately 2. Is the stomach acidic or basic?
What is Acidic.
500
In a good experiment, there is a __________ group with which to compare the experimental group. This group acts as the standard, or normal, group.
What is Control.
500
NaCl (Sodium chloride, or table salt) is an example of a __________. It is a pure substance formed by the combination of two different elements.
What is a Compound.
500
An atom of Beryllium has four protons in its nucleus. The number of neutrons in the nucleus of an atom of Beryllium-9 is ____.
What is 5.
500
Substrates are the reactants that bind to an enzyme. The specific location where these two bind is called the _____________.
What is the Active Site.
500
The pH of the human stomach is approximately 2. Does the stomach release more hydrogen ions (H+) or hydroxide ions (OH-)?
What is Hydrogen Ions.
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