No student devices needed. Know more
39 questions
_______ are the building blocks of matter.
Cells
Atoms
Protons
Electrons
The center of the atom, which contains protons and neutrons, is called the _______________.
Electron
Atom
Proton
Nucleus
_______ are positively charged particles (p+)
Protons
Neutrons
Electrons
Neutrinos
___________ are particles with no charge (n).
Protons
Neutrons
Electrons
Neutrinos
______________ are negatively charged particles (e-) that are found moving around outside the nucleus.
Protons
Neutrons
Electrons
Neutrinos
A(n) ______________ is a pure substance that cannot be broken down into other substances by physical or chemical means.
Atom
Substance
Compound
Element
Atoms of the same element that have different numbers of neutrons are called ____________.
Isotopes
Elements
Compounds
Products
A ____________ is a pure substance formed when two or more elements combine.
Compound
Isotope
Product
Reactants
The chemical bond that forms when electrons are shared is called a ______________.
Polar Bond
Van der waals forces
Ionic Bond
Covalent Bond
A ___________ is a compound in which the atoms are held together by covalent bonds.
Covalent compound
Ionic compound
Molecule
Isotope
An atom that has gained or lost an electron and carries a + or - charge is called a(n) ______________.
Ion
Isotope
Molecule
Charged Atom
A(n) _________________ is an electrical attraction between two oppositely charged atoms or groups of atoms. (positive and negative attract)
Covalent
Ionic Bond
Van der waals forces
Magnetism
When molecules come close together, the positive and negative charges pull and hold the molecules together. This attraction is called __________.
Covalent Bond
Ionic Bond
Polarity
Van der waals forces
A _________ is a process in which atoms in substances are rearranged to form different substances.
Chemical Solution
Chemical Reaction
Chemical Equation
Chemical Expression
In a chemical equation, the ___________ are the substances we start with, and are found on the left side of the arrow.
Products
Atoms
Elements
Reactants
In a chemical equation, the _____________ are the substances we end up with, and are found on the right side of the arrow.
Products
Atoms
Compounds
Reactants
The minimum amount of energy needed for a chemical reaction to occur is called _______________.
Chemical energy
Reaction energy
Activation energy
Enzyme energy
A __________ is a substance that lowers the activation energy of a chemical reaction
Substrate
Activator
Catalyst
Ion
Special proteins called ____________ are the catalysts that speed up chemical reactions in biological processes.
Catalysts
Enzymes
Ions
Substrates
The reactants that bind to the enzyme are called __________.
Substrates
Enzymes
Activators
Ions
The specific location where a substrate binds on an enzyme is called _____________.
Activator
Substrate Site
Enzyme Site
Active Site
Molecules that have an unequal distribution of charges are called _________________.
Water
Charged
Magnetic
Polar molecules
A ___________ is a weak interaction involving a hydrogen atom and a fluorine, oxygen, or nitrogen atom.
Hydrogen bond
Nitrogen bond
Fluorine bond
Oxygen bond
A _________ is a combination of two or more substances, in which the original ingredients retain their own characteristics (hint: like Kool-Aid in water).
Combination
Compound
Mixture
Solution
A mixture that has a uniform composition throughout. Hint: Also called a homogeneous mixture
Solution
Mixture
Heterogeneous mixture
Compound
A ___________ is a substance in which another substance dissolves (example: water is what the Kool-Aid dissolves in).
Solute
Solution
Solvent
Polar Compound
A _________ is the substance that dissolves in the solvent (example: the Kool-aid is the substance that dissolves in the water).
Solute
Solution
Solvent
Compound
Substances that release hydrogen ions (H+) in water are called _______________. Hint: these substances will have a low pH
Bases
Acids
Solutions
Buffers
Substances that release hydroxide ions (OH-) in water are called ______________.
Bases
Acids
Solutions
Compounds
The measure of concentration of H+ ions in a solution is called ______
Hydrogenation
Alkaline
Acidic
pH
________ are mixtures that can react with acids or bases to keep the pH within a certain range.
Acids
Bases
Buffers
Neutralizers
__________ are large molecules that are formed by joining smaller organic molecules together.
Molecule
Chain molecule
Macromolecule
Micromolecule
___________ are molecules made from repeating units of identical or nearly identical compounds called monomers, held together by a chain of covalent bonds.
Monomers
Macromolecules
Polymers
Polymolecules
Compounds made of carbon, hydrogen, and oxygen in the ratio of 1 oxygen and 2 hydrogen atoms for each carbon atom are called _______________.
Lipids
Carbohydrates
Proteins
Enzymes
____________ are molecules made mostly of carbon and hydrogen, and make up fats, oils, and waxes.
Lipids
Carbohydrates
Proteins
Enzymes
A ____________ is a compound made of a chain of small amino acids.
Lipid
Carbohydrate
Protein
Nucleic Acid
___________ are small compounds that are made of carbon, hydrogen, oxygen, nitrogen and sometimes sulfur.
Lipids
Amino Acids
Proteins
Nucleic Acids
__________ are complex macromolecules that store and transmit genetic information.
Lipids
Amino Acids
Proteins
Nucleic Acids
Nucleic acids are made of smaller repeating subunits made of carbon, oxygen, nitrogen, phosphorus, and hydrogen that are called _____________.
Lipids
Nucleotides
Carbohydrates
Amino Acids
Explore all questions with a free account