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3 years ago

Solutions are said to be what kind of mixture? A) Pure substance B) Heterogeneous C) Homogenous D) Element

1 answer:

7 0

Solutions are said to be C. homogeneous mixtures, composed of two or more substances. It is usually liquid, however it may be solid or gas.

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How do you tell by the formula that an element on the periodic table is a metal

Dmitrij [34]

The metalloids are on the right side of the periodic table B, Si, Ge, As, Sb, Te, and At. The nonmetals are also on the right side next to the metalloids, there should be a He at the top right of the periodic table and there should be one more nonmetal at the top left of the periodic table that is H. And from the metals they are all on the middle next to the metalloids, starting from Li, Be, Na, and Mg as so on all of those are metals.

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3 years ago

The fact that water boils at 100° C is an example of a(n)

Vikki [24]

The answer will be physical change

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2 years ago

Write the chemical formulae of a)dinitrogen oxide b) calcium dihydrogen phosphate

il63 [147K]

Answer:

A) Dinitrogen Oxide:

=> $N_{2}O$ (Also called Nitrous Oxide)

B) Calcium Dihydrogen Phosphate:

=> $Ca(H_{2}PO_{4})_{2}$ (Also called Monocalcium phosphate)

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3 years ago

BRAINLIEST IF CORRECT

SVETLANKA909090 [29]

Answer:

indeed!

Explanation:

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2 years ago

Read 2 more answers

Calculate the molarity of the acid solution. H2SO4(aq) with a pH of 2.

Lena [83]

Concentration "molarity" of H₂SO₄ in this solution:

5 × 10⁻³ mol / dm³.

<h3>Explanation</h3>

What's the concentration of H⁺ ions in this solution?

$[\text{H}^{+}] = 10^{-\text{pH}}$ ,

where $[\text{H}^{+}]$ is in the unit mol / dm³.

$\text{pH} = 2$

$[\text{H}^{+}] = 10^{-2} \;\text{mol}\cdot\text{dm}^{-3}$ .

What's the concentration "molarity" of H₂SO₄ in this solution?

Sulfuric acid H₂SO₄ is a strong acid. Note the subscript "2". Each mole of this acid dissolves in water to produce two moles of H⁺ ions. It takes only $\dfrac{10^{-2}}{2} = 5 \times 10^{-3}\;\text{mol}\cdot\text{dm}^{-3}$ of H₂SO₄ to produce twice as much H⁺ ions.

As a result, the molarity of H₂SO₄ is 5 × 10⁻³ mol / dm³ or 0.005 M.

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2 years ago