Basic Chemistry
What is the smallest basic unit of matter?
Atom
What type of bond forms when atoms share electrons?
Covalent bond
What property describes water molecules sticking to each other?
Cohesion
What is the substance that gets dissolved in a solutions?
Solute
What is a pure substance made of only one type of atom?
Element
What type of bond forms when electrons are transferred from one atom to another?
What property describes water sticking to another surface?
Adhesion
What is the substance that does the dissolving?
Solute
What is a substance made from two or more different elements chemically combined?
Compound
What is an atom or group of atoms with an electrical charge called?
Ion
Why is water considered a polar molecule?
Its electrons are shared unequally, creating slightly positive and negative regions.
A solution has a pH of 7. Is it acidic, basic, or neutral?
Neutral
H₂O contains hydrogen and oxygen chemically bonded together. Is H₂O an element, compound, molecule?
Molecule and a compound
What weak attraction forms between slightly charged regions of neighboring water molecules?
Hydrogen Bonds
Water rises along the sides of a narrow tube because it is attracted to the tube's surface. What property of water is being demonstrated?
Adhesion
In salt water, identify the solute and solvent.
Explain the difference between a molecule and a compound.
A molecule is two or more atoms joined together. A compound is two different atoms joined together.
An atom loses an electron and becomes electrically charged. What has it become?
An ion.
Water forms droplets because its molecules are attracted to one another. What property causes this, and what helps create that attraction?
Cohesion; hydrogen bonding between water molecules creates positive and negative sides that are attracted to other water molecules.
A student tests two solutions. Solution A has a pH of 3, Solution B has a pH of 11. Classify both.
A = acidic; B = basic