Ch 2 Chemistry

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Atoms with the same number of protons but with different electrical charges _____.

Are different ions.

In salt, what is the nature of the bond between sodium and chlorine?


What is the result of the animated process?

A positively charged sodium ion and a negatively charged chlorine ion.

An ionic bond involves _____.

An attraction between ions of opposite charge.

Which of these figures correctly illustrates the nature of the bonding of H2O?

What type of bond joins the carbon atom to each of the hydrogen atoms?

Single (nonpolar) covalent

What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons?


Which of these refers to atoms with the same atomic number but different atomic masses?

These atoms are isotopes.

Fluorine’s atomic number is 9 and its atomic mass is 19. How many neutrons does fluorine have?


An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. How many protons does boron have?


What is the term for an atom that is electrically charged as a result of gaining or losing electrons?


The brackets are indicating a(n) _____ bond


What name is given to the bond between water molecules?


Each water molecule is joined to _____ other water molecules by ____ bonds.

four ……. hydrogen

The unequal sharing of electrons within a water molecule makes the water molecule _____.


The tendency of an atom to pull electrons toward itself is referred to as its _____.


In this molecule, what type of bond is found between the oxygen and hydrogens?

polar covalent

Which of these bonds is weakest?

Why isn’t this insect drowning?

Surface tension

A phrase that applies to covalent bonding and not other kinds of bonds is …


The term for a solution with a low pH number, such as lemon juice or vinegar, is


The term for a solution that has an equal concentration of H+ and OH- is


The term for a solution with a high pH number, such as ammonia or bleach, is


An acid is a compound that donates ____ to a solution.


The higher the pH number, the higher the concentration of _____ in a solution.


A substance that accepts H+ when they are in excess and donates H+ when their concentration drops is called a(n) ____.


The tendency of water molecules to stick together is called __________.


What is the pH inside most living cells?

pH 7

Silicon has an atomic number of 14 and a mass number of 28. How many neutrons are found in silicon?


Carbon-12 and carbon-13 are different in the number of their _____.


Four elements combine to make about 96% of the mass of the human body. Which of the following elements is one of the four?


An atom’s ________ are found in its nucleus.

neutrons and protons

The four most common elements found in living organisms are ________.

carbon, oxygen, nitrogen, and hydrogen

The bond between oppositely charged ions is a(n) ________ bond.


What name is given to bonds that involve the sharing of electrons?


Adjacent water molecules are joined by ________ bonds.


Sweating cools your body by ________.

evaporative cooling

As water freezes, ________.

its molecules move farther apart

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