CHEMISTRY MIDDLE SCHOOL

How are chemical and physical changes alike?

Answers

Answer 1
Answer: They are both changing things. There is a change in the mixture/substance

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From which layer of the atmosphere do particles of air escape into space?

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Answers

Answer: The layer from where particles of air escape into space is exosphere.

Explanation:

The atmosphere is divided into layers. There are 5 main layers of atmosphere, which are: Troposphere, Stratosphere, Mesosphere, Thermosphere and Exosphere.

  1. Troposphere is the lowest layer of the atmosphere where most of the weather occurs.
  2. Then comes the Stratosphere which is about 50 km above the Earth's surface. It contains most of the ozone which is present in the atmosphere.
  3. Then comes the Mesosphere which starts from 50 km and extends upto 85 km from the Earth's surface.
  4. Then comes the Thermosphere which starts from 90 km and extends to between 500 km and 1,000 km.
  5. Exosphere is the last layer of the atmosphere, through which anything escapes the atmosphere to space. This layer extends upto 10,000 km from the Earth's surface.

Hence, the layer from where particles of air escape into space is exosphere.

Answer:

Exosphere

Explanation:

I took the k12 test.

Why do you need a reference point to know if an object is moving

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to measure the distance and velocity 

How do scientist communicate the results of an investigation?​

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Answer:

scientists often communicate their research results in three general ways:

1) One is to publish their results in peer-reviewed journals that can be ready by other scientists.

2) Two is to present their results at national and international conferences where other scientists can listen to presentations

Explanation:

Answer:money

Explanation:

What do chemical compound and mixture have in common

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Compounds and mixtures are both made up of one or more elements. 
Compound and Mixture also have Homogeneous Composition

What is the purpose of phosphates in fertilizerwhat is the purpose of phosphates in laundry detergent

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Fertilizers provide soil with nutrients, like phosphate, that are required to produce healthy gardens and abundant crops. The Fertilizer Institute reports that experts estimate one-third of the world's food supply would not be produced without the use of commercial fertilizers....i hope i help u....
Phosphates make the soil fertile, and enrich the soil with phosphorous.

Phosphates are used in laundry detergents. Phosphate reacts with dirt in clothes and removes them.

True or False. Solutions for which water is the solvent are called aqueous solutions.

Answers

This is true. Water is the solvent in aqueous solutions
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