Chemistry pre-assessment

 $3+2\left(7-4\right)$  

• 9

• 13

• 15

• 31

0.000786 in scientific notation is

•  $7.86\ \times10^{-3}$  

•  $7.86\times10^{-4}$  

•  $7.86\times10^4$  

•  $7.86\ \times10^3$  

 $2^4$  

• 4

• 8

• 16

• 32

 $\frac{9cm^3}{3cm^2}$  

•  $3cm^5$  

•  $3cm^1$  

•  $3cm^{-1}$  

•  $3cm^{-5}$  

If 2a = 3b, and a = 6, what does b equal?

• 2

• 4

• 6

• 12

Density is defined as mass per unit volume or

 $d=\frac{m}{v}$  
Solve the density equation for variable v.

•  $v=d+m$  

•  $v=\frac{d}{m}$  

•  $v=dm$  

•  $v=\frac{m}{d}$  

The value of a fraction is less than 1 when…

• numerator > denominator

• denominator > numerator

• abscissa > ordinate

• ordinate > abscissa

How many small cubes are in the larger cube?

• 15

• 20

• 30

• 60

If a variable X is directly proportional to variable Y, it means…

• as Y increases, X increases.

• as Y increases, X decreases

• there is no relationship between X and Y

• none of these answers are correct

A spontaneous reaction occurs...

• very slowly

• by giving off large amounts of heat

• without any outside influence

• under high pressure