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Sergio [31]
3 years ago
15

3. Which is not true about natural selection?

Chemistry
1 answer:
tatuchka [14]3 years ago
5 0

Answer:

A:There must be diversity in the population.

Explanation:

Hopefully this helps!

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3 years ago
Describe an experiment for the preparation and collection of Oxygen sodium peroxide​
vitfil [10]

Answer:

Making oxygen

Oxygen can be made from hydrogen peroxide, which decomposes slowly to form water and oxygen:

hydrogen peroxide → water + oxygen

2H2O2(aq) → 2H2O(l) + O2(g)

The rate of reaction can be increased using a catalyst, manganese(IV) oxide. When manganese(IV) oxide is added to hydrogen peroxide, bubbles of oxygen are given off.

Apparatus arranged to measure the volume of gas in a reaction. Reaction mixture is in a flask and gas travels out through a pipe in the top and down into a trough of water. It then bubbles up through a beehive shelf into an upturned glass jar filled with water. The gas collects at the top of the jar, forcing water out into the trough below.

To make oxygen in the laboratory, hydrogen peroxide is poured into a conical flask containing some manganese(IV) oxide. The gas produced is collected in an upside-down gas jar filled with water. As the oxygen collects in the top of the gas jar, it pushes the water out.

Instead of the gas jar and water bath, a gas syringe could be used to collect the oxygen.

5 0
3 years ago
Can someone Summarize how the suns gravity affects the planets please.
egoroff_w [7]

The sun's gravity pulls the planet toward the sun, which changes the straight line of direction into a curve. This keeps the planet moving in an orbit around the sun. Because of the sun's gravitational pull, all the planets in our solar system orbit around it.

3 0
3 years ago
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State two applications of simple distillation of separating mixture​
Salsk061 [2.6K]

Answer:

Purify drinking water of unwanted

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<em>Hope this helps! :D</em>

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3 years ago
___ replacement involves one element replacing another element in a compound.
Solnce55 [7]

Answer:

single

Explanation:

4 0
3 years ago
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