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Sav [38]
4 years ago
13

Two balls are placed near one another and hang down, as

Chemistry
1 answer:
Makovka662 [10]4 years ago
6 0

Answer:

A

Explanation:

If B) - the balls would be moved apart

If C) - the balls would be moved close to each other.

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Limestone (CaCO3) is decomposed by heating to quicklime (CaO) and carbon dioxide. Calculate how many grams of quicklime can be p
Harman [31]

Answer: 2800 g

Explanation:

CaCO_3(s)\rightarrow CaO(s)+CO_2(g)

According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number 6.023\times 10^{23} of particles.

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Given mass = 5 kg = 5000 g

\text{Number of moles}=\frac{5000g}{100g/mol}=50moles

1 mole of CaCO_3 produces = 1 mole of CaO

50 moles of CaCO_3 produces =\frac{1}{1}\times 50=50moles of CaO

Mass of CaO=moles\times {\text{Molar mass}}=50moles\times 56g/mole=2800g

2800 g of CaO is produced from 5.0 kg of limestone.

3 0
4 years ago
How can you best classify this molecule<br><br>A) Carboxylic<br>B) Alcohol<br>C) Ester<br>D) Amine​
gavmur [86]

Answer:

B) Alcohol

Explanation:

It is methanol. Alcohol has group 'OH'

4 0
3 years ago
Read 2 more answers
Use the information in the square to answer the questions about copper.
lubasha [3.4K]
  • <u>There</u><u> </u><u>are</u><u> </u><u>2</u><u>9</u><u> </u><u>protons </u><u>in</u><u> </u><u>an</u><u> </u><u>atom</u><u> </u><u>of</u><u> </u><u>copper.</u>
  • <u>The</u><u> </u><u>nu</u><u>mber</u><u> of</u><u> </u><u>el</u><u>ectrons</u><u> </u><u>in</u><u> </u><u>an</u><u> </u><u>ato</u><u>m</u><u> of</u><u> </u><u>copper</u><u> </u><u>is</u><u> </u><u>2</u><u>9</u><u>.</u>
  • <u>There</u><u> </u><u>are</u><u> </u><u>3</u><u>5</u><u> </u><u>neutro</u><u>n</u><u> </u><u>in</u><u> </u><u>an</u><u> </u><u>atom</u><u> </u><u>of</u><u> </u><u>copper</u><u>.</u>

7 0
3 years ago
What is the number of protons in the nucleus of the atom
aleksklad [387]

Answer: It depends on the element.

Explanation: Every element has a different amount of protons in its nucleus. It is the same as its atomic number on the periodic table. For example: Hydrogen has an atomic number of 1 because it has 1 proton in its nucleus, Helium has 2, Carbon has 6, Platnium has 78, and so on...

3 0
2 years ago
If the resistance of a circuit is 3 ohms, and the voltage produced by the cell in the circuit is 12 volts, what's the magnitude
koban [17]

Answer:

<h2>4 A</h2>

Explanation:

The magnitude of the current can be found by using the formula

i =  \frac{v}{r} \\

v is the voltage

r is the resistance

From the question we have

i =  \frac{12}{3}  = 4 \\

We have the final answer as

<h3>4 A</h3>

Hope this helps you

7 0
3 years ago
Read 2 more answers
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