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3 years ago

What is a contributor of global warming?

Chemistry

2 answers:

iogann1982 [59]3 years ago

8 0

Carbon dioxide emissions from, well, whatever emits CO2 really.

svet-max [94.6K]3 years ago

7 0

Answer: B. Carbon dioxide

Explanation: Global warming arises due to the emission of gases which are accumulated in the atmosphere, that is, the layer of these gases increases in an atmosphere, and prevents the reflected sun rays from the ground to leave the atmosphere. Such a higher amount of sunshine-heat which is higher than necessary, remains in the atmosphere and heats the surface of the earth, which is the effect of the greenhouse. These are gases produced by combustion of fossil fuels, and during this combustion they are emitted into the atmosphere. Gases that cause the greenhouse effect are carbon dioxide, methane and nitrous oxide. The problem is that fossil fuels are used to produce electricity, in agriculture and transport. Global warming has drastically increased over the past decades, and if preventive measures which involving the use of alternative fuels are not undertaken, the catastrophic consequences, which are already visible, will be even greater.

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Si desea preparar 300 gramos de una solución de azúcar en agua que tenga una concentración de 20% m/m en cuanto gramos de soluto

Digiron [165]

Answer:

$m_{soluto}=60g$

Explanation:

¡Hola!

En este caso, al considerar la unidad de concentración de porcentaje masa/masa, podemos escribir su fórmula como:

$\%m/m=\frac{m_{soluto}}{m_{solucion}}*100\%$

Podemos identificar la masa de soluto (azúcar) como la incógnita, y resolverla como se muestra a continuación:

$m_{soluto}=\frac{\%m/m*m_{solucion}}{100\%}\\\\m_{soluto}=\frac{20\%*300g}{100\%}\\\\m_{soluto}=60g$

¡Saludos!

5 0

3 years ago

Something that causes a response in an organism is called a(n) _____.

fomenos

A Stimulus is the answer

7 0

3 years ago

Which of the following best describes earth tectonic plates ?

meriva

Answer:

B They move because of the convection currents in the mantle.

6 0

2 years ago

Read 2 more answers

Given these reactions, where X represents a generic metal or metalloid 1 ) H 2 ( g ) + 1 2 O 2 ( g ) ⟶ H 2 O ( g ) Δ H 1 = − 241

anygoal [31]

Answer : The enthalpy of the given reaction will be, -1048.6 kJ

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

The main reaction is:

$XCl_4(s)+2H_2O(l)\rightarrow XO_2(s)+4HCl(g)$ $\Delta H=?$

The intermediate balanced chemical reactions are:

(1) $H_2(g)+\frac{1}{2}O_2(g)\rightarrow H_2O(g)$ $\Delta H_1=-241.8kJ$

(2) $X(s)+2Cl_2(g)\rightarrow XCl_4(s)$ $\Delta H_2=+461.9kJ$

(3) $\frac{1}{2}H_2(g)+\frac{1}{2}Cl_2(g)\rightarrow HCl(g)$ $\Delta H_3=-92.3kJ$

(4) $X(s)+O_2(g)\rightarrow XO_2(s)$ $\Delta H_4=-789.1kJ$

(5) $H_2O(g)\rightarrow H_2O(l)$ $\Delta H_5=-44.0kJ$

Now reversing reaction 2, multiplying reaction 3 by 4, reversing reaction 1 and multiplying by 2, reversing reaction 5 and multiplying by 2 and then adding all the equations, we get :

(1) $2H_2O(g)\rightarrow 2H_2(g)+O_2(g)$ $\Delta H_1=2\times 241.8kJ=483.6kJ$