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Questions (20)
How does a balanced chemical equation demonstrate the Law of Conservation of Mass?(1 point)
Responses it shows that no atoms have
3 answers
66 views
Sodium reacts with chlorine to form the compound sodium chloride, or salt. The chemical formula below shows how the two elements
3 answers
99 views
Which procedure could be used to demonstrate that matter is conserved during a physical change?(1 point)
Responses Find the mass
3 answers
59 views
One molecule of bromine (Br2) and two molecules of potassium chloride (KCl) combine in a reaction. How many atoms are in the
3 answers
292 views
Use the unbalanced chemical equation to answer the question.
2NaHCO3 → Na2CO3 + CO2 Which of the following can be added to the
3 answers
76 views
Convert 3.875×109 meters to kilometers. Express the answer to the exact decimal place.
Note: 1 kilometer is equal to 1,000
4 answers
86 views
Convert 4.083×106 kilometers to meters. Express the answer to the exact decimal place.
Note: 1 kilometer is equal to 1,000
3 answers
111 views
Ali’s farmhouse has a height of 2.307×108 meters. Convert the height to centimeters. Express your answer in scientific
3 answers
230 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
204 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
3 answers
251 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
3 answers
65 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
3 answers
50 views
In chemistry class, Carlos calculated the number of molecules in 100 moles. The calculator displayed the number 6.02E25. What is
3 answers
169 views
In government class, Nadia computed the amount of debt of the federal government after a third of it was paid in 1995. The
3 answers
35 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
3 answers
58 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
4 answers
286 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
3 answers
293 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
3 answers
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314 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
3 answers
63 views
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
3 answers
64 views
