Significant Figures
How many significant figures?
0.0207900
6 significant figures
0.0631 μg to fg
6.31 x 107 fg
What is the density of a liquid with a mass of 24.5 g and a volume of 8.94 mL?
2.74 g/mL
What is the atomic symbol for an element with 30 protons and 36 neutrons?
6630Zn
Convert 113°F to K
318 K
Round the value 151460 to three significant figures
151000
8.345 x 1012 dW to MW
8.345 x 105 MW
What is the mass of an object with a density of 145 g/mL and a volume of 3.0 L?
4.4 x 105 g
Identify what A, Z, and X stand for
AZX
A= mass number= #p + #n
Z= atomic # = #p
X= element symbol
If a cook wants to heat 1.4 kg of water from 32°C to 100.0°C using a gas stove, how many joules are needed to heat the water?
390000 Joules
Write the answer to the appropriate number of significant figures:
[(0.120)(0.08206)(273.15+23)] / (230/760.0)
9.6
How many minutes does it take to travel 25 km at 75 mph?
12 minutes
Carbon dioxide gas has a density of 1.96 g/L. What volume would 0.44 g of carbon dioxide occupy?
0.22 L
How many neutrons does this element have:
3116S
15 neutrons
Silver has two naturally occurring isotopes, Ag-107 that has a mass of 106.91 amu with an abundance of 51.84% and Ag-109 that has a mass of 108.90 amu and an abundance of 48.16%. Calculate the average atomic mass of silver.
107.9 amu
Write the answer to the appropriate number of significant figures:
(2.34 x 102 g + 4.443 x 10-1 g) / (0.0323 mL)
7260 g/mL
A hybrid SUV consumes fuel at a rate of 12.8 km/L. How many miles can the car travel on 22.5 gallons of gasoline? (1 mi= 1.6903 km)
677 miles
A block of lead has dimensions of 2.50 cm by 4.05 cm by 7.36 cm. The block weighs 1.032 kg. Calculate the density of this block of lead.
13.8 g/cm3
What is the atomic symbol for an isotope of potassium, K that has a mass number of 39?
3919K
If 40.0 kJ of energy is absorbed by 500.0 g of water at 10.0 °C, what is the final temperature of the water?
29.1 °C