2 years ago

An atom was observed with +3 charge, n = 38, and e = 28. What is the mass number of the atom?

Chemistry

1 answer:

Finger [1]2 years ago

3 0

Answer: 66

Explanation: To find the mass number you would have to add the number of protons and the number of neutrons.

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C+ O2 --> CO2 +60kJ <br> is the reaction exothermic or<br> endothermic?

igomit [66]

Answer:

exothermic

Explanation:

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3 years ago

A pot of boiling water on the stove is slowly releasing steam. Which process is this an example of?

Viktor [21]

evaporation. When a substance undergoes a change of matter from a solid to gas, it is the process of evaporation.

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3 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

The diagram below shows three stages in the water cycle. Condensation -----> 1----->2 Which statement is correct for the d

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It is d I think best of luck

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In a chemical reaction, what is defined as the difference between the potential energy of the products and the potential energy

zlopas [31]

I Believe That The Answer Is A
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3 years ago

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