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3 years ago

What is an independent variable

Chemistry

1 answer:

frez [133]3 years ago

4 0

Answer:

a variable (often denoted by x ) whose variation does not depend on that of another.

Explanation:

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Which group in the the periodic table contains elements with the valence electron configuration of ns2 npl1?

marissa [1.9K]

3A (also known as group 13) all the elements have 3 electrons in their outer most shell thats why theyll be divided into the ns2 and the np1

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3 years ago

Why does a yellow pencil look yellow?

Tpy6a [65]

Answer:

Regular, non-fluorescent colors appear to our eyes when objects absorb some wavelengths of light, and reflect others. For example, a yellow pencil looks yellow because its paint reflects the wavelength of yellow light, and absorbs the other wavelengths.Mar

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2 years ago

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

Hitman42 [59]

Complete Question:

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

Answer:

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

Explanation:

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

What is the source of the forces that cause this plate movement

Gennadij [26K]

Convection currents in the mantle, I got it right on a p e x

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3 years ago

What’s the balanced equation for the reaction between zinc oxide and dilute hydrochloric acid ?

larisa [96]

Answer:

ZnO + 2HCl → ZnCl₂ + H₂O

Explanation:

The unbalanced reaction between zinc oxide (ZnO) and dilute hydrochloric acid (HCl) is:

ZnO + HCl → ZnCl₂ + H₂O

Now we'll procede to balance the equation:

There is 1 Cl atom on the left side and 2 on the right, so we change that:

ZnO + 2HCl → ZnCl₂ + H₂O

The number of atoms for each element is the same on both sides, so the equation is now balanced.

7 0

3 years ago