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3 years ago

Light energy comes from

Chemistry

2 answers:

GaryK [48]3 years ago

4 0

light energy comes from not alot of sleep

Travka [436]3 years ago

3 0

Answer:

The sun

Explanation:

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Describe how an El Niño event affected weather, food production, water supply, or human health.

uysha [10]

Answer:

El Niño is associated with death and disease, most of which result from weather-related disasters such as floods and droughts. In 1997 Central Ecuador and Peru suffered rainfall more than 10 times normal, which caused flooding, extensive erosion and mudslides with loss of lives, destruction of homes and food supplies.

7 0

3 years ago

Read 2 more answers

1. 2KCIO3, -- 2KCI + 302 How many moles of O2 will be produced from 2.25 moles of KCIO3?

Scilla [17]

Answer:

3.375moles of O₂

Explanation:

The reaction expression is given as;

2KClO₃ → 2KCl + 3O₂

Number of moles of KClO₃ = 2.25moles

Now;

To find the number of moles of O₂ produced we use known number of moles.

So;

2 mole of KClO₃ will produce 3 moles of O₂

2.25moles of KClO₃ will produce $\frac{2.25 x 3}{2}$ = 3.375moles of O₂

8 0

3 years ago

The photodissociation of ozone by ultraviolet light in the upper atmosphere is a first-order reaction with a rate constant of 1.

atroni [7]

Answer:

[O₃]= 8.84x10⁻⁷M

Explanation:

The photodissociation of ozone by UV light is given by:

O₃ + hν → O₂ + O (1)

The first-order reaction of the equation (1) is:

$rate = k [O_{3}] = - k \frac{\Delta [O_{3}]}{\Delta t}$ (2)

where k: is the rate constant and Δ[O₃]/Δt: is the variation in the ozone concentration with time, and the negative sign is by the decrease in the reactant concentration

We can get the following expression of the first-order integrated law of the reaction (1), by resolving the equation (2):

$[O_{3}]_{t} = [O_{3}]_{0} \cdot e^{-kt}$ (3)

where [O₃](t): is the ozone concentration in the elapsed time and [O₃]₀: is the initial ozone concentration

We can calculate the initial ozone concentration using equation (3):

$[O_{3}]_{t} = 5.0 \cdot 10^{-3}M \cdot e^{-(1.0\cdot 10^{-5}s^{-1}) (\frac{10d \cdot 24h \cdot 3600 s}{1d \cdot 1h})} = 8.84 \cdot 10^{-7}M$

So, the ozone concentration after 10 days is 8.84x10⁻⁷M.

I hope it helps you!

3 0

3 years ago

Calculate the number of oxygen atoms and its mass in 50g of CaCo3

xz_007 [3.2K]

The number of oxygen atoms = 3

Mass = 24 g

<h3>Further explanation</h3>

The formula of a compound shows the composition of the constituent elements

CaCO₃ is composed of 3 types of elements, namely Ca, C and O

The amounts of each of these elements in the compound CaCO₃:

Ca = 1
C = 1
O = 3

So the number of oxygen atoms = 3

mass of Oxygen :

$\tt mass~O=\dfrac{3\times Ar~O}{MW~CaCO_3}\times mass~CaCO_3\\\\mass~O=\dfrac{3\times 16}{100}\times 50=24~g$

5 0

3 years ago

2.What is the chemical formula for ammonium nitrite

jeyben [28]

Answer:

NH4NO3

Explanation:

I hope this helps you:)

5 0

3 years ago