Which two human activities are believed to be the greatest contributors to global warming?

Chemistry

2 answers:

vivado [14]3 years ago

7 0

B. Deforestation and burning of fossil fuels. <span />

NeTakaya3 years ago

5 0

Answer: B. deforestation and the burning of fossil fuels.

Explanation:

Global warming is a phenomena of rise in global temperatures due to certain human activities and natural processes like volcanic eruption.

The burning of fossil fuels and deforestation are the examples of human activities which contribute to global warming. These two activities increase the abundance of greenhouse gases like methane, carbon monoxide, carbon dioxide, nitrous oxides, sulphur oxides in the atmosphere. These gases trap the heat energy from sunlight and increase the temperature of the atmosphere. Hence, are responsible for global warming.

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A basic substance consisting of only one kind of atom is called a(n) _____.

juin [17]

Answer is D) Element

6 0

3 years ago

What is the theoretical yield of Li3N in grams when 12.8 g of Li is heated with 34.9 g of N2?

Olenka [21]

Answer:- 21.4 grams of $Li_3N$ are formed.

Solution:- The balanced equation is:

$6Li+N_2\rightarrow 2Li_3N$

From this equation, lithium and nitrogen reacts in 6:1 mol ratio. Limiting reactant gives the theoretical yield of the product. We will calculate the grams of the product for the given grams of both the reactants and see which one of them gives the limited amount of the product. This limited amount of the product will be the theoretical yield.

The molar mass of Li is 6.94 gram per mol and for $N_2$ It is 28.02 gram per mol. The molar mass of $Li_3N$ is 34.83 gram per mol. The calculations for the grams of the product for given grams of both the reactants are shown below: