Match the term with its description. (4 points) Column A
1.
Acid

:
Acid

2.
Base

:
Base

3.
pH

:
pH

4.
Litmus paper

:
Litmus paper

Column B
a.
A value from 0 to 14 is used to specify how acidic or basic a compound is when it is dissolved in water

b.
A compound that increases hydrogen ions (H+) when it is dissolved in a solution

c.
Used to measure the pH of substances by determining their hydrogen ion concentration

d.
A compound that increases hydroxide ions (OH-) when it is dissolved in a solution

How much energy moves onto the next level, in an energy pyramid

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture