Chemistry Midterm Part 2

The chemical formula f a compound indicates ____.

Which of the following changes to a metal is a chemical change?

A. ) bending
B. ) rusting
C. ) melting
D. ) polishing

Which of the following involves a chemical change? 

A. ) decomposing
B. ) melting
C. ) grinding
D. ) mixing

The diameter of a carbon atom is 0 000 000 000 154 m. What is this number expressed in scientific notation?

A. ) 1.54 * 10^-12 m
B. ) 1.54 * 10^-10 m
C. ) 1.54 * 10¹⁰ m
D. ) 1.54 * 10¹² m

The expression of 5008 km in scientific notation is _____.

A. ) 5.008 * 10³ km
B. ) 5.008 * 10^-3 km
C. ) 5.008 * 10⁴ km
D. ) 50.08 * 10^-4 km

What is the result of multiplying 2.5 * 10¹⁰ & 3.5 * 10^-7?

a.) 8.75 * 10^-3
b.) 8.75 * 10¹⁷
c.) 8.75 * 10³
d.) 8.75 * 10^-17

What is the result of adding 2.5 * 10³ & 3.5 * 10²?

A. ) 6.0 * 10³
B. ) 2.9 * 10²
C. ) 2.9 * 10³
D. ) 6.0 * 10⁵

The closeness of a measurement to its true value is a measure of its ___.

Which of the following measurements contains 2 significant figures?

A. ) 0.004 00 L
B. ) 0.000 44 L
C. ) 0.004 40 L
D. ) 0.004 04 L

Which of the following measurements is expressed to 3 significant figures?

A. ) 0.070  mm
B. ) 7.30 10^-7
C. ) 0.007 m
D. ) 7077 mg

How many significant figures are in the measurement 0.003 4 kg?

How many significant figures are in the measurement 811.40 grams?

The chief advantage of the metric system over other systems of measurement is that it ____.

What is the SI unit for mass?

Who was the man who lived from 460 B.C - 370 B.C. and was among the first to suggest the idea of atoms?

The smallest particle of an element that retains the properties of that element is a(n) _____.

Evidence about Dalton's atomic theory has shown that