Unit 1: Measurements

How many significant digits are there in the following number:   0.00530

• 2
• 3
• 5
• 6

How many significant digits are there in the following number:   590800

• 2
• 3
• 4
• 6

If you add 20 ml to 172 ml, how many ml do you have to the correct significant digits?

• 190
• 192
• 200
• 2.0 x 10²

A student poured three samples of solution.  In their beaker, they had 22.5 ml, 22.4 ml and 22.8 ml.  They needed 26 ml per sample.  Were they accurate or precise in their measurements?

• Precise
• Accurate
• Both
• Neither

If you needed 25.4 ml of solution, which piece of glassware would you need to use?

• 100 ml beaker
• 100 ml graduated cylinder
• 125 ml flask
• 50 ml graduated cylinder

How many milliliters are in 2 liters?

• 0.002
• 2
• 200
• 2000

How many kilograms are in 500,000 milligrams?

• 0.5
• 50
• 500
• 500,000

An object has a mass of 25 grams and a volume of 50 ml.  What is its density?

• 0.5 g/ml
• 2 g/ml
• 5 g/ml
• 1250 g/ml

An 20 gram sample was placed in a beaker containing water.  The volume of the water changed from 22 ml to 26 ml when this occurred.  What was the density of the object?

• 5 g/ml
• 0.2 g/ml
• 0.8 g/ml
• 0.9 g/ml

A graph is fitted with a line of best fit.  The data is close to the line and the line slopes up.  Which of the following represents the correlation between the data and the line?

• R²= 0.02
• R²= -0.89
• R²= 0.89
• R²= -0.02