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3 years ago

Match them please, I’ll give brainliest but only if it’s right.

Chemistry

1 answer:

Molodets [167]3 years ago

8 0

1. A
2. D
3. C
4. B
Hope this helps.

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Identify the element with 3 energy levels and 2 valence electrons.

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Answer:

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4 years ago

A student heats a sample of hydrate once, and the mass of the sample and the evaporating dish is 16.428 g. After a second heatin

jolli1 [7]

Answer:

12.371 g

Explanation:

Given :

$m_{evaporating\ dish}=1.135\ g$

$m_{evaporating\ dish}+m_{Hydrate\ sample}=25.637\ g$

$m_{evaporating\ dish}+m_{First\ heated\ sample}=16.428\ g$

$m_{evaporating\ dish}+m_{Second\ heated\ sample}=13.266\ g$

Mass of salt hydrate:

$m_{evaporating\ dish}=1.135\ g$

$m_{evaporating\ dish}+m_{Hydrate\ sample}=25.637\ g$

$m_{Hydrate\ sample}=25.637-m_{evaporating\ dish}\ g=25.637-1.135\ g=24.502\ g$

Mass of salt anhydrous:

$m_{evaporating\ dish}=1.135\ g$

$m_{evaporating\ dish}+m_{Second\ heated\ sample}=13.266\ g$

$m_{Second\ heated\ sample}=m_{salt\ anhydrous}=13.266-m_{evaporating\ dish}\ g=13.266-1.135\ g=12.131\ g$

Mass of water:

$m_{water}=m_{Hydrate\ sample}-m_{salt\ anhydrous}=24.502-12.131\ g=12.371\ g$

$m_{water}=12.371\ g$

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4 years ago

How does litmus indicator work

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Answer:

The substance which responds to the change in the concentration of the hydronium ions in solution by changing its color is known as an indicator.

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3 years ago

A scientist studies the growth of plants in a laboratory. Which experimental procedure would provide evidence that

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The experimental procedure would provide evidence that plants need

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gases with other elements/compounds.

The identical plants containing nitrogen and room air should both be

measured for the growth difference between them.

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