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Taya2010 [7]
3 years ago
7

Which of the following is true?

Chemistry
2 answers:
tresset_1 [31]3 years ago
4 0

Answer:

B

Explanation:

The sun can be dangerous but it also helps our Earth in a lot of ways

ASHA 777 [7]3 years ago
4 0
B the sun is helpful for our planet but when out of the atmosphere the rays from the sun can be quite harmful
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A 1. 3×10−6mol sample of sr(oh)2 is dissolved in water to make up 25. 0 ml of solution. what is the ph of the solution at 25. 0∘
VMariaS [17]

The pH of the solution at 25 degree celsius of 1.3 × 10⁻⁶ moles of a sample of Sr(OH)₂ is 10.02.

<h3>How do we calculate pH?</h3>

The pH of any solution gives an idea about the acidic and basic nature of the solution and the equation of pH will be represented as:

pH + pOH = 14

Given that,

Moles of Sr(OH)₂ = 1.3 × 10⁻⁶ mol

Volume of solution = 25mL = 0.025L

The concentration of Sr(OH)₂ in terms of molarity = 1.3×10⁻⁶/0.025

                                                                                    = 5.2×10¯⁵M

Dissociation of Sr(OH)₂ takes place as:

                               Sr(OH)₂ → Sr²⁺ + 2OH⁻

From the stoichiometry of the reaction 1 mole of Sr(OH)₂ produces 2 moles of OH⁻.

Given that the base is a strong base and that it entirely dissociates into its ions, the hydroxide ion concentration is 5.2×10¯⁵×2 = 1.04×10¯⁴ M.

pOH = -log[OH⁻]

pOH = -log(1.04×10¯⁴)

pOH = 3.98

Now we put this value on the first equation we get,

pH = 14 - 3.98 = 10.02

Therefore, the value of pOH is 10.02.

Learn more about pH here:

brainly.com/question/24595796

#SPJ4

4 0
2 years ago
11. What is another name for the transition metals? Group B elements noble gases Group A elements Group C elements
finlep [7]

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Group B elements

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Group B metals are referred to as transition metals. They are located in the middle of the periodic table between Group IIA and Group IIIA. They provide transition between the "base formers" on the left and "acid formers" on the right.

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The volume of 10 grams of frozen water is more than the volume of 10 grams of liquid water
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I would sieve them because the flour will go through but not the rice

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Explanation: hope this helps.

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