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A mobile phone holds 1.28×1011 bytes of storage. You can also pay more money to get an additional 384,000,000,000 bytes. How
1 answer
102 views
The half-life of uranium-235 is 700,000,000 years. The half-life of uranium-238 is 4.463×1011 years longer. What is the
1 answer
88 views
An empty dump truck weighs about 2.8×105 pounds. How much does it weigh if 15,300 pounds of trash is added? The answer should
1 answer
470 views
The population of a city is given as 3.45×106 . A nearby city has a population of 1.3×105 . What is the sum of the populations
2 answers
425 views
Add 7.3×107+1.8×107 . Which is the correct sum?(1 point)
Responses 9.1×107 9.1 times 10 superscript 7 baseline 9.1+107 9.1
2 answers
399 views
Sam is comparing the half-life of two isotopes of uranium. The half-life of Uranium-238 is 4.5×109 years. The half-life of
1 answer
104 views
In government class, Nadia computed the amount of debt of the federal government after a third of it was paid in 1995. The
1 answer
61 views
In chemistry class, Carlos calculated the number of molecules in 100 moles. The calculator displayed the number 6.02E25. What is
1 answer
230 views
Jim’s music library on his phone holds 1,900 songs. The songs have an average time of 3.5 minutes. Use scientific notation to
1 answer
80 views
Kendra finds the dimensions of a sticky note. She uses a meter stick to determine that the dimensions are 1.25×10−8 meters
1 answer
91 views
Dina computed the mass of 1,000 protons in grams. The calculator displayed the number 1.67E−21 . What is the mass of 1,000
1 answer
281 views
Alberto added two very small numbers using a calculator. The calculator displayed the number 6.13E−14 . What is this number in
19 answers
250 views
Ali’s farmhouse has a height of 2.307×108 meters. Convert the height to centimeters. Express your answer in scientific
1 answer
288 views
Convert 4.083×106 kilometers to meters. Express the answer to the exact decimal place.
Note: 1 kilometer is equal to 1,000
1 answer
173 views
Convert 3.875×109 meters to kilometers. Express the answer to the exact decimal place.
Note: 1 kilometer is equal to 1,000
2 answers
118 views
Use the unbalanced chemical equation to answer the question.
2NaHCO3 → Na2CO3 + CO2 Which of the following can be added to the
1 answer
108 views
One molecule of bromine (Br2) and two molecules of potassium chloride (KCl) combine in a reaction. How many atoms are in the
1 answer
350 views
Which procedure could be used to demonstrate that matter is conserved during a physical change?(1 point)
Responses Find the mass
1 answer
88 views
Sodium reacts with chlorine to form the compound sodium chloride, or salt. The chemical formula below shows how the two elements
1 answer
144 views
How does a balanced chemical equation demonstrate the Law of Conservation of Mass?(1 point)
Responses it shows that no atoms have
1 answer
95 views
