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Drupady [299]
3 years ago
12

A scientist has a container with a substance inside. At first, the molecules in the substance move away from each other. Later,

the molecules move around each other. What change did the scientist observe in the substance
Chemistry
1 answer:
den301095 [7]3 years ago
3 0

Answer:

before the substance was a gas it was a liquid.

Explanation:

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How does a diaphragm help in viewing the specimen in a microscope​
Keith_Richards [23]

Answer:

Diaphragm controls the amount of light reaching the specimen. It is located above the condenser and below the stage. Most high quality microscopes include an Abbe condenser with an iris diaphragm. Combined, they control both the focus and quantity of light applied to the specimen.

4 0
3 years ago
Help please!!! My science homework is due in 2 days and I need help!
sertanlavr [38]
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  • <em>2) Intrusive igneous rocks cool slowly from magma in the crust. They have a lot of crystals. Extrusive igneous rocks cool fast from lava near the surface. They are covered with tiny crystals.</em>
  • <em>3) Usually they will contain metal elements that oxidise easily. For example, the Igneous rocks on them Moon (the Maria or 'oceans') are darker in colour due to a higher percentage of iron.</em>
  • <em>4) The hue of igneous rocks is proportional to their density. Darker colored rocks have a higher density because they contain more material and iron. Light colored rocks have a lesser density because they contain less material and iron.</em>
  • <em>5)  Magma is hot, molten rock under the earth's surface; lava is when magma reaches the earth's surface (it is then called lava).</em>
  • <em>6) The mineral grains with a pegmatitic texture are unusually big. The biggest ones are often more than 3 cm long. In intrusive rocks, this texture can be seen. The fact that they were particularly big did not imply that they cooled slowly.</em>
  • <em>7)  Igneous rocks are classified according to their origin, texture and mineral composition. A igneous rock formed from lava that erupted on to earths surface.</em>

<em>~</em>

<em>ROR</em>

5 0
2 years ago
49.Which of the following statements regarding chemical equilibrium is true?
crimeas [40]
A asystem at equilibrium stops
8 0
4 years ago
All chemical reactions have a conservation of(1) mass, only(2) mass and charge, only(3) charge and energy, only(4) mass, charge,
Semenov [28]
All chemical reactions have a conversation of mass and energy. 

Because:- There are only two laws for conversation in a chemical reaction. The conversation of mass, no mass can be created nor destroyed. Also, the law of conversation of mass states that no energy can be created nor destroyed in a chemical reaction. The charge can obviously change because they can bond and change charges. 
7 0
4 years ago
Read 2 more answers
Which of the following is the correct electron dot structure for a hydroxide ion?
denis23 [38]

Answer:

A

Explanation:

A hydroxide ion is given as:

       OH⁻

The electron dot notation shows only the chemical symbol of the element surrounded by dots to represent the valence electrons. The chemical symbol denotes the nucleus and all electrons except the valence electrons.

The dots are arranged on the four sides in pairs.

Oxygen is made up of 6 valence electrons, and since the ion has a net negative charge, the hydrogen and oxygen achieved their stable configuration this way.

4 0
3 years ago
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