Data Analysis Unit Rvw

Determine the number of significant figures in 30.00490

The number 650, 232, 900 cm is calculated during a lab. Round to four sig figs.

A student found the mass of a gas to be 0.00086 g. What would this be in scientific notation?

• 0.86 x 10^-4 g

• 8.6 x 10^-4 g

• 8.6 x 10⁴ g

• 8.6 x 10³ g

Which prefix is equal to 100?

• centi-

• deci-

• deka-

• hecto-

Whic prefix is equal to 1/100?

• centi-

• deci-

• deka-

• hecto-

What is 6.25 x 10⁵ mL in standard notation?

Which of the following is a quantitative observation?

• a brown gas

• a volume of 23.2 mL

• all the product reacts with air and turns colorless

• expands to fill the whole container

• mass of 10.0 g

Which of the following is aconversion between a meter and a kilometer?

• 1 m = 1000 km

• 1000 m = 1 Km

• 1 m = 100 km

• 100 m = 1 km

A student measure the density of an object to be 1.12 g/mL, then 1.12 g/mL and again at 1.14 g/mL. If the true value is 2.79 g/mL the student's results are said to be:

• accurate

• neither accurate and precise

• precise

• both accurate and precise

A student measure the boiling point of isopropyl alcohol and determines it to be 78.1C, then 78.4C, and again to be 78.1C. If the accepted value is 78.5C,  the student's results are said to be:

• accurate

• neither accurate and precise

• precise

• both accurate and precise