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Pepsi [2]
3 years ago
12

I need helppp plssss

Chemistry
1 answer:
Ganezh [65]3 years ago
3 0
Li2O + H2O → 2LiOH
This is the answer
3rd blank write 2
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What happens to the temperature and density of the material between points B and C?
makvit [3.9K]

Answer:

Temperature decreases and density increases

Explanation:

Let us remember that density of a material increases as the temperature of the material decreases. So the cooler a material becomes, the denser it becomes also.

Between points B and C, the material rapidly cools down and the temperature decreases accordingly. This ultimately results in an increase in density since cooler materials are denser than hot materials.

7 0
3 years ago
Ccl2f2 is considered to be environmentally safe and is used as a refrigerant. The heat of vaporization of ccl2f2 is 289 j/g. Wha
algol [13]

Answer:

52.08grams

Explanation:

Heat of fusion is the energy needed to transform solid water into liquid water. Hess's Law.

The temperature change Liquid water to Solid Ice. 20 degrees C --> 0 degrees C. is 20 degree C.

The heat needed for this  is =  4.184 J/(g*C) * (36 grams of water) * 20 degrees C =  3012 joules of energy.

Liquid water to solid water.

Heat of fusion of water is 335j/g = 6.02kJ/mol

The heat needed for this is 6.02 kJ/mol * 2 moles of water = 12.04 kJ = 12040 joules of energy.

Adding the  two energies, we have a total energy iof 15052 joules.

15052 joules = H(vap of CCl2F2) * grams of CCl2F2 needed = 289 J/g * x grams 15052 / 289 = 52.08 grams needed.

3 0
4 years ago
Read 2 more answers
The concentration of H30 in your swimming pool is 4 x 10^-5 M. What is the pH of your pool? O a.-4.4 Ob.4.4 Oc. 0.00004 O d.-0.6
mariarad [96]

Answer:

b. 4.4

Explanation:

pH is related to the concentration of H₃O⁺ through the following equation:

pH = -log([H₃O⁺]) = -log(4 x 10⁻⁵)

pH = 4.4

8 0
4 years ago
Which of these is a mixture?<br> A)potassium<br> B)salad<br> C)water H20<br> Dsugar C12H22O11
Lelu [443]
A salad is a mixture but h2o is a mixture of molechules
8 0
4 years ago
The turnover number is defined as the maximum number of substrate molecules that can be converted into product molecules per uni
hjlf

Answer:

Turnover number = 113182s⁻¹

Explanation:

Turnover number is a concept used to know the activity of an enzyme. The higher turnover number, the higher activity of the enzime.

Turnover number is defined as:

Turnover number = Rmax / [E]t

As Rmax is  249 μmol⋅L⁻¹⋅s⁻¹ and [E]t is 2.20 nmol⋅L⁻¹

As 1μmol = 1000nmol, Rmax = 249000 nmol⋅L⁻¹⋅s⁻¹. Replacing:

Turnover number = 249000 nmol⋅L⁻¹⋅s⁻¹ / 2.20 nmol⋅L⁻¹

<h3>Turnover number = 113182s⁻¹</h3>
8 0
3 years ago
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