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Otrada [13]
3 years ago
13

Which of the following correctly identifies two of the eight elements of weather

Chemistry
1 answer:
Shtirlitz [24]3 years ago
8 0
Are there any options?

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A relationship in which one variable increases as the other variable decreases is an inverse relationship.
Brut [27]

Answer:

TRUE

Explanation:

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Krupton (Kr) is a <br><br>A. Gas<br>B. Metal<br>C. Non of these<br>D. Metalloid​
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B is gas


The chemical element krypton is classed as a noble gas and a nonmetal.







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3 0
3 years ago
Given an acidic solution with a pH of 4.5, what is pOH of the same solution?
Crazy boy [7]

Answer: Option C) 9.5

Explanation:

Given that,

pOH of solution = ?

pH of solution = 4.5 (it is an acidic solution because any pH values less than 7.0 is said to be acidic)

Recall that pH is the negative logarithm of hydrogen ion concentration in the solution while pOH is the negative logarithm of hydroxide ion concentration in the solution.

Hence, pH + pOH = 14

4.5 + pOH = 14

pOH = 14 - 4.5

pOH = 9.5

Thus, the pOH of the same solution is 9.5

8 0
3 years ago
Which of the following is a physical property of matter
Black_prince [1.1K]

Answer: Physical properties of matter include color, hardness, malleability, solubility, electrical conductivity, density, melting point, and boiling point. For the elements, color does not vary much from one element to the next

3 0
3 years ago
Read 2 more answers
What mass of zinc is needed to react with 23.1 g of phrosphoric acid according tot he equation?
Hitman42 [59]

<u>Complete Question:</u>

what mass of zinc is needed to react with 23.1 g of phosphoric acid according tot he equation?

3 Zn + 2 H₃PO₄ = 3 H₂ + Zn₃(PO₄)₂

<u>Answer:</u>

22.98 g, the mass of zinc (Zn) is needed to react with 23.1 g of phosphoric acid according to the given equation.

<u>Explanation:</u>

Given chemical reaction:

           3 Zn + 2 H₃PO₄ = 3 H₂ + Zn₃(PO₄)₂

If the substance’ molecular weight is the number of grams required per mole, the number of moles expressed as a given quantity of substances shall correspond to the grams of that substance divided by the molecular weight. Hence,

              \text {number of moles}=\frac{\text {mass}}{\text {molar weight}}

To find no. of moles of phosphoric acid:

Given:

mass of phosphoric acid = 23.1 g

molar weight of of phosphoric acid = 97.994 = 98 g/mole

Therefore,

no. of moles of phosphoric acid =\frac{23.1}{98}=0.2357 \text { moles }

Look into the given chemical reaction and divide as the following:

If 2 moles of H₃PO₄ reacts with 3 moles of Zn then 0.2357 moles of H₃PO₄ reacts with X moles of Zn. Then,

   \text { X moles of } \mathrm{Zn}=\frac{(0.2357 \times 3)}{2}=\frac{0.707}{2}=0.3535 \text { moles of } \mathrm{Zn}

Now, calculate mass of zinc as follows, we know

molar mass of zinc is 65 g/mol

 mass\ of\ zinc = number\ of\ moles \times molar\ weight =0.3535 \times 65

Mass of zinc = 22.98 g

7 0
3 years ago
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