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4 years ago

Is mixing food coloring with water a chemical or physical change?

2 answers:

7 0

That would be a physical change because it is not changing the chemical completion. they could still be separated. the chemical completion has not been changed.

in order to create a chemical change the substance must be changed suck as baking, burning, or creating a chemical reaction such as foaming.

alexandr1967 [171]4 years ago

4 0

Mixing food coloring with water is a physical change.

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3 years ago

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3 years ago

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2 years ago

Read the given equation. 2Na + 2H2O → 2NaOH + H2

Crank

Answer:

B) 12.9 grams.

Explanation:

How many moles of molecules in that 6.30 L of H₂?

The volume of one mole of an ideal gas at STP (0 °C, 1 atm) is 22.4 liters.

(The volume of that one mole of gas at STP will be 22.7 liters if STP is defined as 0 °C and 10⁵ Pa).

$\displaystyle n(\text{H}_2) = \frac{6.30\;\text{L}}{22.4\;\text{L}\cdot\text{mol}^{-1}} = 0.28125\;\text{mol}$ .

How many moles of Na will be needed?

The coefficient in front of Na in the equation is twice the coefficient in front of H₂. It takes two moles of Na to produce one mole of H₂.

$n(\text{Na}) = 2\;n(\text{H}_2) = 2\times 0.28125= 0.5625\;\text{mol}$ .

What's the mass of that many Na atoms?

Refer to a modern periodic table. The molar mass of ₁₁Na is 22.990. The mass of one mole of Na atoms is 22.990 gram. The mass of 0.5625 moles of Na atoms will be

$m = n\cdot M = 0.5625 \times 22.990 = 12.9\;\text{g}$ .

(2 sig. fig. as in the volume of the H₂ gas.)

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3 years ago