12. In line 13, what is the purpose for the ellipsis?

a. to indicate omitted text

b. to indicate a slight pause

C. to indicate a mood change

d. to indicate an unstated thought

Which is an example of making a qualitative observation?1measuring the speed of the chemical reaction2describing how copper changes color in chlorine3recording how long it takes to burn magnesium4showing the results of an experiment with a graph

Which is more metallic a) Silicon b) Aluminum

Ethoxyethane is a solvent that is slightly polar. Table salt is an ionic solid

What are the horizontal rows of the periodic table called

How are the properties of acids and bases similar?

What happens to an isotopes during radioactive

Why does the effective nuclear charge increase across a row of the periodic table?

Iodine-131 decays to form xenon-131. the half-life of this reaction is 8.07 days. from a 200-g sample of iodine-131, how much of the sample is xenon-131 after 16.14 days?

Complete the following statement by checking all that apply Creativity allows scientists to develop multiple approaches to solving problems. adapt to changes in scientific knowledge. look at old problems in new ways.

The atomic weight of hydrogen is 1.00794. a. True b. False