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4 years ago

Which two changes in state are most represented in water cycle

Chemistry

1 answer:

Nadya [2.5K]4 years ago

3 0

Answer: Evaporation and condensation are the two changes in state which are most represented in water cycle.

Explanation:

A process of circulation of water by passing through different states between the atmosphere, oceans and land is known as water cycle.

In water cycle, the most represented changes in state are evaporation and condensation. As during evaporation, the water present in the oceans, rivers, wells or on the land evaporates because of the heat from the sun as a result the liquid state is changing into gas.

Whereas, during condensation gas or water vapours changes into liquid. For example, when water condenses in the atmosphere it results in the formation of clouds.

Thus, it can be concluded that evaporation and condensation are the two changes in state which are most represented in water cycle.

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An element is a pure substance. It can not easily be broken down into parts by physical means.

liberstina [14]

Answer: An element is a pure substance. It can not easily be broken down into parts by physical means.

A)True

B)False

<u>The answer is true. </u>

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4 years ago

if 98% of atoms of li have a mass of 7 and 2% have a mass of 6 what roughly will the relative atomic mass be

Nastasia [14]

Answer: 6.98

The Relative Atomic Mass of Li = (98*7 + 2*6)/98+2

RAM of Li = (686+12)/100

RAM of Li= 6.98

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3 years ago

AgNO3 + NaCl mc017-1.jpg NaNO3 + AgCl

lina2011 [118]

The balanced reaction is:

AgNO3 + NaCl = NaNO3 + AgCl

<span>We are given the amount of silver nitrate to react with sodium chloride. This will be our starting point.</span>

15.0 mol AgNO3 (1 mol AgCl / 1 mol AgNO3 ) =15.0 mol AgCl

The amount of moles produced is the same with the amount of the given reactant since they only one is to one ratio.

8 0

4 years ago

Read 2 more answers

Calculate the ph at the equivalence point for the titration of 0.230 m methylamine (ch3nh2) with 0.230 m hcl. the kb of methylam

Vlad1618 [11]

Answer: The pH at the equivalence point for the titration will be 0.65.

Solution:

Let the concentration of $[OH^-]$ be x

Initial concentration of $[CH3NH_2]$ , c = 0.230 M

$CH_3NH_2+H_2O\rightleftharpoons CH_3NH_3^++OH^-$

at eq'm c-x x x

Expression of $K_b$ :

$K_b=\frac{[CH_3NH_3^+][+OH^-]}{[CH_3NH_2]}=\frac{x\times x}{c-x}=\frac{x^2}{c-x}$

Since ,methyl-amine is a weak base,c>>x so $c-x\approx c$ .

$K_b=\frac{x^2}{c}=5.0\times 10^{-4}=\frac{x^2}{0.230 M}$

Solving for x, we get:

$x=1.07\times 10^{-2} M$

Given, HCl with 0.230 M , it dissociates fully in water which means $[H^+]$ = 0.230 M

$[OH^-]=[H^+]$ will result in neutral solution, since $[OH^-]$

Remaining $[H^+]$ after neutralizing $[OH^-]$ ions

$[H^+]_{\text{left in solution}}=[H^+]-[OH^-]=0.230-1.07\times 10^{-2}=0.2193 M$

$pH=-log{[H^+]_{\text{left in solution}}=-log(0.2193)=0.65$

The pH at the equivalence point for the titration will be 0.65.

8 0

4 years ago

What is conditional reflexes??

SIZIF [17.4K]

Answer:

Actions that you have trained yourself to perform.

they are obtained by experience. they are not passed from generation. they can be learnt or abolished. Higher center's of brain is responsible for conditional reflexes

Explanation:

example riding a bike, swimming, typing

6 0

4 years ago