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3 years ago

1. Put 0.000 034 into scientific notation.

Chemistry

2 answers:

xxMikexx [17]3 years ago

6 0

Answer:

3.4x10 to the power of 5

Explanation:

Marina CMI [18]3 years ago

5 0

Answer:

My answer to the question is 3.4×10^-5.

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Number of electrons absorbed by the main energy level (n = 4):

VARVARA [1.3K]

Answer:

Explanation:

Because 2 x n square gives the total energy level been absorbed = 2 x16

=32

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3 years ago

Which choice describes an organism found in the under story of a rain forest?

Sophie [7]

Answer:

Palms and other small trees

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2 years ago

The conversation of cyclopropane to propene in the gas phase is a first order reaction with a rate constant of 6.7x10-⁴s-¹. a) i

Rus_ich [418]

Answer: a) The concentration after 8.8min is 0.17 M

b) Time taken for the concentration of cyclopropane to decrease from 0.25M to 0.15M is 687 seconds.

Explanation:

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant

t = age of sample

a = let initial amount of the reactant

a - x = amount left after decay process

a) concentration after 8.8 min:

$8.8\times 60s=\frac{2.303}{6.7\times 10^{-4}s^{-1}}\log\frac{0.25}{a-x}$

$\log\frac{0.25}{a-x}=0.15$

$\frac{0.25}{a-x}=1.41$

$(a-x)=0.17M$

b) for concentration to decrease from 0.25M to 0.15M

$t=\frac{2.303}{6.7\times 10^{-4}s^{-1}}\log\frac{0.25}{0.15}\\\\t=\frac{2.303}{6.7\times 10^{-4}s^{-1}}\times 0.20$

$t=687s$

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3 years ago

True or False: Both molecules and compounds are pure substances.

Solnce55 [7]

Answer:

False

Explanation:

Hope this helps!

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2 years ago

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Why does nuclear fusion occur in stars but not on Earth?

disa [49]

Answer:

Fusion reactions require a lot of heat and pressure

Explanation:

nuclear fusion takes place only at extremely high temperatures. That's because a great deal of energy is needed to overcome the force of repulsion between the positively charged nuclei. ... A: Nuclear fusion doesn't occur naturally on Earth because it requires temperatures far higher than Earth temperatures.

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3 years ago

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