Heterogeneous materials are always mixtures. Are homogeneous materials always pure substances? Explain.

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Answer 1

Answer: A homogeneous material is not always a pure substance.
For example, a solution is a homogeneous mixture, but it is not a pure substance. Salty water is homogeneous, but it is not a pure substance. There are two ingredients: salt, and water.

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Which substance is use to increase the rate of catalyst?

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Answer:

A catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process. ... Enzymes are proteins that act as catalysts in biochemical reactions. Common types of catalysts include enzymes, acid-base catalysts, and heterogeneous (or surface) catalysts.

Is rock solution because it is made up of minerals, water, stone, and dirt?

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Rocks are made up deposited minerals that form and condense into rocks

yes its made of minerals water stone and dirt

How do you calculate the density?

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The way to calculate density is Mass/volume. I hope this helps

What is the greatest number of electrons in the first seven energy level

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Answer:

280 electrons

Explanation:

The number of electrons in each energy level are determine by using following formula:

2n²

Here "n' is the energy level. we will put the energy level number in place of "n" and number of electrons will easily found.

Principle energy levels number of electrons

1 2n² = 2(1)²= 2

2 2n² = 2(2)²= 8

3 2n² = 2(3)²= 18

4 2n² = 2(4)²= 32

5 2n² = 2(5)²= 50

6 2n² = 2(6)²= 72

7 2n² = 2(7)²= 98

So the total number of electrons in first seven energy levels will be the sum of the number of electrons in each energy levels.

2+8+18+32+50+72+98 = 280 electrons

Coal is made of carbon. Coal burns at high temperature in the presence of oxygen. The result of this chemical reaction is

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c +o 2 = co 2 i think....hopefully its not wrong

80cm^3 of oxygen gas diffused through a porous hole in 50 seconds how long wiil it take 120cm^3 of nitrogen (iv) oxide to diffuse through the same hole at the same conditions ?

Answers

Answer: it will take 89.93secs

Explanation:Please see attachment for explanation

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