Sig Figs
How many significant figures does the number 924 have?
3 Significant Figures
What is 0.00006 in scientific notation?
6.0×10^−5
A 2.75 kg sample of a substance occupies a volume of 250.0 cm3 . Find its density in g/cm3.
11 g/cm3
A student measures the mass and volume of a piece of aluminum. The measurements are 25.6 grams and 9.1 cubic centimeters. The student calculates the density of the aluminum. What is the percent error of the student's calculated density of aluminum.
4%
Round the number 1258 into three significant figures.
1260
89015 has _____ significant digits.
5
What is 32,000,000 in scientific notation?
3.2×10^7
Find the volume that 35.2 g of carbon tetra-chloride(CCL4) will occupy if it has a density of 1.60 g/mL.
22.0 mL
A student's height is measured as 182 cm but his actual height is 174 cm. Find the percent error in the measurement.
4.60%
How many significant figures are in 3.02 x 10^8
3
How many zeros in 0.0079 are significant digits?
0
3.77185 x 10^1
37.7185
The density of ethanol is 0.789 g/mL at 20 degrees Celsius. Find the mass of a sample of ethanol that has a volume of 150.0 mL at this temperature.
118.35 g
A student determined in the laboratory that the percent by mass of water in CuSO • 5H2O is 40.0%. If the accepted value is 36%, what is the percent error?
11%
30.0 g of hydrochloric acid (HCl) is needed. The density of 1.164 g/mL. Find the volume of the hydrochloric acid that must be measured in a graduated cylinder.
25.8 ml
What is the number of significant figures in the number 0.000236
3 Significant Figures
4.4 x 10^-9
0.0000000044
A cube of gold (Au) has a side length of 1.55 cm. If the sample is found to have a mass of 71.9 g, find the density of Au in g/cm3.
19.3 g/cm3
A student determined that the percent of H2O in a hydrate was 39.0%. The percent of H2O in this hydrate is 36.0% according to an accepted chemistry reference.is 36.0% according to an accepted chemistry reference. What is the student's percent of error?
8.3%
Change the scientific notation of 2.1 x 10^6 into standard form.
2,100,000
How many significant figures are there in the measurement 347,000g
3
What is the number 0.0000000003 in scientific notation
3 x 10^-10
A sample of aluminum is put on a balance and found to have a mass of 43.6 g. The student decides to use the water-displacement method to find the volume. The initial volume reading is 25.5 mL and, after the Al sample is added, the water level rose to 41.7 mL. Find the density of the Al sample in g/cm3 .
2.69 g/cm3
The accepted value for the molar volume of a gas is 22.4 liters. In a laboratory experiment, a student determines the value to be 24.8 liters. What is the percent error of the student's measurement?
10.7%
A student intended to make a salt solution with a concentration of 10.0 grams of solute per liter of solution. When the student's solution was analyzed, it was found to contain 8.90 grams of solute per liter of solution. What was the percent error in the concentration of the solution?
11.0%