CHEMISTRY HIGH SCHOOL

Compute 3.5×4.48697. Round the answer appropriately. Express your answer numerically using the proper number of significant figures.

Answers

Answer 1
Answer: 16 because the actual answer is 15.704395 then u round the .7 because it greater than 5 making it 16
Answer 2
Answer:

Final answer:

The product of 3.5 and 4.48697 is 15.705395, which rounds to 16 when using the appropriate number of significant figures.

Explanation:

To find the product of 3.5 and 4.48697, you would simply multiply the two numbers together. This results in 15.705395.

However, the least number of significant digits in the numbers given is two (in the number 3.5). Therefore, we will round our answer to two significant figures. 15.705395 rounds to 16 when rounding appropriately to two significant figures as we count from the first non-zero digit, which is 1, then to the next digit which is 5.


Learn more about Multiplication and rounding numbers here:

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Petroleum and coal can be mined from the continental shelf. t/f

Answers

True

Petroleum and coal can be mined from the continental shelf. Hot magma from inside the Earth seeps out from the crevices in the mid-ocean ridge. There is speculation regarding whether this is a cost-effective technique. Fossil fuels and mineral deposits can be located all throughout the continental shelf and also in some of the deepest depths of the ocean.

Answer:The given statement is true.

Explanation:

Continental Shelf: A portion of continent submerged under the relative shallow ocean water.Most of the gradually slopes down in to the water.

The relatively flat surface and shallow water makes it fitr place to harvest sea food, non renewable energy resources like : coal, petroleum .

A solution is considered neutral if its pH is _________ 7.a. equal to
b. less than
c. greater than

Answers

When the solution has a ph equal to 7

Answer:

a, equal to

Explanation:

What is the atomic mass of w

Answers

Answer:

183.84 u

Explanation:

W (also known as "Tungsten") atomic number is 74 and atomic mass is   183.84 u

Suppose that a certain fortunate person has a net worth of $79.0 billion ($7.90×1010). If her stock has a good year and gains $3.20 billion (3.20×109) in value, what is her new net worth?

Answers

A net worth: $79.0 billion.
Value of stock : $3.20 billion.
New net worth:
$79.0 + $3.20 = $82.20 billion = $82.20 * 10^9 = $8.20 * 10^10

Answer:

$8.20 * 10^10

Explanation:

You may recall that the products of the complete combustion of ahydrocarbon are water vapor and carbon dioxide gas. Write the balanced
equation showing the combustion of methane. Do not forget to include the
states of matter of the reactants and the products. Hint: Methane is a gas at
standard temperature and pressure.

Answers

Answer: CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(g)

Explanation: According to law of conservation of mass, mass can neither be created nor be destroyed.

Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

This is an example of combustion reaction in which hydrocarbon reacts with oxygen to form carbon dioxide and water. This is an exothermic reaction in which a large amount of heat is liberated, thus water also exists as vapors.

CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(g)
CH4 + 2O2 --> CO2 + 2H2O

Which energy source produces carbon dioxide?a. plutonium
b. uranium
c. sunlight
d. natural gas

Answers

The answer is d. natural gas. All the other choices are alternative sources of energy, and do not produce or emit any greenhouse gas such as carbon dioxide (CO2). Natural gas, on the other hand, is an organic substance containing a significant amount of carbon, that when burned for fuel, results in the emission of CO2.
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