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Svetlanka [38]
4 years ago
9

Why do scientists use models?

Chemistry
1 answer:
Travka [436]4 years ago
6 0

Answer:

Models make some things easier to understand.

Measurements can be made only on models.

Models help scientists visualize things they can’t see.

Models are perfectly accurate representations of objects.

Scientists can analyze models to make predictions.

Explanation:

Mark as brainliest......

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Which Locations are likely to have subatomic particles with the GREATEST mass?
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2 and 3, because there are the protons and neutrons which have a greater mass than the electrons which are found in the locations 1 and 4.

Explanation:

The atom contains a nucleus, which is made from protons and neutrons, and electrons which are found around the nucleus.

The mass of the atoms is concentrated in the very tiny space represented by the nucleus. Of course the electrons have a mass too, but is very small compared to the protons and neutrons, and we usually neglect its mass.

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subatomic particles

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Explanation:

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Which invention has done the most to help predict weather and warn people of approaching storms?
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The wind vane, the rain gauge, the anemometer, the barometer, and the thermometer.
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What mass of ammonia can be produced if 13.4 grams of nitrogen gas reacted ?
aivan3 [116]

Answer:

If 13.4 grams of nitrogen gas reacts we'll produce 16.3 grams of ammonia

Explanation:

Step 1: Data given

Mass of nitrogen gas (N2) = 13.4 grams

Molar mass of N2 = 28 g/mol

Molar mass of NH3 = 17.03 g/mol

Step 2: The balanced equation

N2 + 3H2 → 2NH3

Step 3: Calculate moles of N2

Moles N2 = Mass N2 / molar mass N2

Moles N2 = 13.4 grams / 28.00 g/mol

Moles N2 = 0.479 moles

Step 4: Calculate moles of NH3

For 1 mol N2 we need 3 moles H2 to produce 2 moles NH3

For 0.479 moles N2 we'll produce 2*0.479 = 0.958 moles

Step 5: Calculate mass of NH3

Mass of NH3 = moles NH3 * molar mass NH3

Mass NH3 = 0.958 moles * 17.03 g/mol

Mass NH3 = 16.3 grams

If 13.4 grams of nitrogen gas reacts we'll produce 16.3 grams of ammonia

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3 years ago
Name two bases which react with dillute sulfuric acid to give zinc sulfate
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Answer:

Zinc Carbonate

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