All categories

3 years ago

Select the steps that are associated with energy entering the system. Check all that apply.

Chemistry

2 answers:

quester [9]3 years ago

8 0

Answer: option c. the mixing of solute and solvent molecules

Explanation:

JulsSmile [24]3 years ago

3 0

Answer:

A and B

the separation of solvent molecules and the separation of solute molecules

Explanation:

You might be interested in

How is the number of unpaired valance electrons in an atom related to the number of bonds that the atom can form?

TiliK225 [7]

It is the same amount. For example, Carbon has 4 electrons. Putting those 4 electrons in a Lewis Dot Structure will show that they are not paired, so 4 is the number of bonds Carbon can make.

6 0

3 years ago

When 2 grams of Hydrogen (H2) react with 32 grams of Oxygen (O2) the reaction yields hydrogen peroxide (H2O2). How many grams of

alexgriva [62]

The correct answer is D: 34

Hope it helps :)

5 0

3 years ago

What is the percent ionization of a monoprotic weak acid solution that is 0.188 M? The acid-dissociation (or ionization) constan

djyliett [7]

Answer: The percent ionization of a monoprotic weak acid solution that is 0.188 M is $3.59\times 10^{-4}\%$

Explanation:

Dissociation of weak acid is represented as:

$HA\rightleftharpoons H^+A^-$

cM 0 0

$c-c\alpha$ $c\alpha$ $c\alpha$

So dissociation constant will be:

$K_a=\frac{(c\alpha)^{2}}{c-c\alpha}$

Give c= 0.188 M and $\alpha$ = ?

$K_a=2.43\times 10^{-12}$

Putting in the values we get:

$2.43\times 10^{-12}=\frac{(0.188\times \alpha)^2}{(0.188-0.188\times \alpha)}$

$(\alpha)=3.59\times 10^{-6}=3.59\times 10^{-4}\%$

Thus percent ionization of a monoprotic weak acid solution that is 0.188 M is $3.59\times 10^{-4}\%$

5 0

3 years ago

14Carbon has an atomic number of 6, but has 8 neutrons. How many electrons are present in each atom?

Elena L [17]

The atomic number (6) represents the number of protons in an atom. protons are usually equal to electrons unless the atom is forming a bond or has a charge of some kind on it. Therefore, I believe the correct answer is letter "a". 6 electrons. Any questions?

5 0

3 years ago

An 18.0 g piece of an unidentified metal was heated from 21.5 °C to 89.0 °C. If 789.75 J of heat energy was absorbed by the meta

nydimaria [60]

Answer: The metal is Calcium.

Explanation:

To calculate the specific heat of substance during the reaction.

$q=m\times c\times \Delta T$