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STatiana [176]
3 years ago
8

CAN SOMEONE PLEASE HELP ME !!!

Chemistry
1 answer:
olga nikolaevna [1]3 years ago
8 0
Climate-
the weather conditions prevailing in an area in general or over a long period.

rising maximum temperatures
rising minimum temperatures
rising sea levels
higher ocean temperatures
an increase in heavy precipitation (heavy rain and hail)
shrinking glaciers
thawing permafrost

Fossil fuels — coal, petroleum, and natural gas — are our main sources of energy, producing the vast majority of fuel, electricity, and heat used by people across the globe. In 2005 a whopping 86 percent of energy used worldwide came from fossil fuel combustion, and right now in the United States, the number isn’t much lower at about 85 percent. Unfortunately fossil fuels are also the primary culprit behind climate change. In the United States, they’re to blame for more than 80 percent of greenhouse gas emissions — and 98 percent of CO2 emissions alone. And while natural processes can absorb some of this CO2, an estimated 4.1 billion metric tons of it is added to our atmosphere each year. That number will rise dramatically if we don’t check ourselves.
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A chemical reaction is the process by which a ___ takes place
Verizon [17]
A chemical reaction is the process by which a CHANGE takes place (?)
4 0
3 years ago
Read 2 more answers
The decay of radioactive elements occurs at a fixed rate. The half-life of a radioisotope is the time required for one half of t
Stolb23 [73]

Answer:

100 grams of C-14 decays to 25 grams in 11,460 years.

The C-14 isotope is only useful for dating fossils up to about 50,000 years old

If an ancient bone contains 6.25% of its original carbon, then the bone must be 22,920 years old.

Explanation:

We already know that the half life of C-14 is 5,730 years. After the first half life, we have 50 grams remaining. This takes 5,730 years. After the second half life (11,460 years now gone) we have 25 grams of C-14  left.

If a fossil material is  older than 50,000 years an undetectable amount of 14C is left in the sample hence Carbon-14 is no longer suitable for dating the sample.

From;

0.693/5730 = 2.303/t log (No/0.0625No)

Where;

t = time taken and No = initial amount of C-14

0.693/5730= 2.77/t

t = 22,920 years

6 0
3 years ago
How many molecules in 9.18 moles of C11H12O22
Setler [38]

Answer:

55.3 × 10²³ molecules

Explanation:

Given data:

Number of moles of C₁₁H₁₂O₂₂ = 9.18 mol

Number of molecules = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

For given data:

9.18 mol × 6.022 × 10²³ molecules /1 mol

55.3 × 10²³ molecules

5 0
3 years ago
Which of the reactions below are catalyzed? Check all that apply.
Verdich [7]

Answer:

B. Salt, NaCl, is produced by the process of evaporation of seawater or brine. If the surface area of the water is increased, the same volume of water evaporates faster.

C. The Haber process combines hydrogen and nitrogen to make ammonia. The two gases are passed through a reactor under pressure and at high temperatures. If iron is added to the reactor, the yield of ammonia increases.

Explanation:

Evaporation of water is responsible for the production of sodium chloride also known as table salt. Sodium and chlorine are present in water. When more evaporation of water occurs, sodium and chlorine come close together forming sodium chloride. Haber process is responsible for the production of ammonia which is used as fertilizer. For speed up the process, catalyst is used such as iron in order to complete the reaction in less time. Iron binds hydrogen and nitrogen with each other.

7 0
3 years ago
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Be sure to explain each step in the energy flow, identifying the form of energy represented and how it changes from one form to
Dvinal [7]
The question that you asked has already been answered

5 0
3 years ago
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