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3 years ago

Which natural disaster is most unpredictable?

Chemistry

2 answers:

hram777 [196]3 years ago

7 0

Answer:

Explanation:

Earthquakes

Earthquakes: Nature's most unpredictable and one of her most devastating natural disasters.

natima [27]3 years ago

5 0

Answer:

Earthquake

Explanation:

Because we have not discovered any high techto predict it, In 2011 a 9.0 earthquake hit the coast of Sendai they had no warning

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Two or more elements chemically combined make a?

In-s [12.5K]

Tqo or more elements combine to make a compound.

5 0

3 years ago

The balanced equation below represents the decomposition of potassium chlorate.

dezoksy [38]

The oxidation number of chlorine in the reactant can be determined by K ion and O ion. K ion is +1 and O ion is -2. And the Cl is +5. The gas has the greatest entropy and the solid has the least. In the production, there are solid and gas. So it has more entropy than the reactants with solid only.

6 0

4 years ago

Which of the following are cations? Check all that apply.

Lostsunrise [7]

Answer:

barium

calcium

aluminum

magnesium

copper

Forms cation

Explanation:

4 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

4 years ago

A) What volume of concentrated nitric acid (15.8 M) is needed to prepare 4.0 L of a 2.0 M solution?

azamat

Answer:

A.0.51L

B 1.67L

Explanation:

using the formula ;C1V1 =C2V2

15.8×V1=2×4

15.8V1=8

V1=8/15.8

V1=0.51L

apply the same method for B

4 0

2 years ago