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olga2289 [7]
3 years ago
15

The ancient Egyptians used black eye make up with which element just give me an element don’t give me a definition

Chemistry
1 answer:
Kay [80]3 years ago
3 0

Answer:

galena

Explanation:

The green eye paint was made of malachite, a copper carbonate pigment, and the black kohl was made from galena, a dark grey ore.

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You only have 15g of sodium to use for this reaction. how much copper(ii must you combine with the sodium to isolate the maximum
Eva8 [605]
The balanced chemical reaction is:

<span>CuCl2 + 2Na → 2NaCl + Cu 

We are given the amount of sodium to be used up in the reaction. This will be the starting point for our calculations.

15 g Na ( 1 mol / 22.99 ) ( 1 mol Cul2 / 2 mol Na ) (134.45 g / 1 mol ) = 43.86 g CuCl2 needed to be able to obtain the maximum amount of copper.</span>
8 0
3 years ago
which of the following compounds would be considered an electrolyte? a. c6h12o6 b. naoh c. co2 d. agcl
AlekseyPX

Answer: B: NaOH

Explanation:

5 0
1 year ago
Substituting carbonated soft drinks for dairy products in the diet is a bad idea because the resulting high _______________ inta
nata0808 [166]

Answer: The correct answer is C) carbon dioxide; calcium.

Explanation:

Carbonated soft drinks contain big concentrations of carbon dioxide, which is the bubbles that we see and feel. When these drinks are included regurly in the diet, the carbon dioxide levels are increased; and according to several studies high carbon dioxide values are related with bone loss.

Additionally, calcium is known for being an important nutrient for both formation and maintenance of bones, so inadequate intake of calcium in the diet results in a bone loss.

7 0
3 years ago
A sample of metal has a mass of 24.64 g, and a volume of 5.91 mL. What is the density of this metal?
dlinn [17]

Answer:

\boxed {\boxed {\sf 4.17 \ g/mL}}

Explanation:

We are asked to find the density of a metal. Density is the mass per unit volume. It is calculated by dividing the mass by the volume.

\rho= \frac{m}{v}

The mass of the metal sample is 24.64 grams and the volume is 5.91 milliliters. We can substitute these values into the formula.

  • m= 24.64 g
  • v= 5.91 mL

\rho=\frac{24.64 \ g }{5.81 \ mL}

Divide.

\rho= 4.169204738 \ g/mL

The mass measurement has 4 significant figures the volume measurement has 3 significant figures. Our answer for density must match the least number of significant figures, which is 3.

For the number we calculated, that is the hundredth place. The 9 in the thousandth place tells us to round the 6 up to a 7.

\rho \approx 4.17 \ g/mL

The density of this metal is approximately <u>4.17 grams per milliliter.</u>

3 0
2 years ago
What is neutralisation reaction?<br>​
valina [46]

Answer:

In chemistry, neutralization or neutralisation (see spelling differences) is a chemical reaction in which acid and a base react quantitatively with each other. In a reaction in water, neutralization results in there being no excess of hydrogen or hydroxide ions present in the solution.

6 0
3 years ago
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