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Svetlanka [38]
3 years ago
9

Why do scientists use models?

Chemistry
1 answer:
Travka [436]3 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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Define the term standardization
trapecia [35]

Explanation:

Standardization is the process of creating protocols to guide the creation of a good or service based on the consensus of all the relevant parties in the industry. ... Standardization also helps in ensuring the safety, interoperability, and compatibility of goods produced.

6 0
2 years ago
Primary needs in South Africa and secondary needs and wants in South Africa<br>​
leonid [27]

Answer:

Food, safe water, housing, education, and health care are examples of basic needs. Wants are desires that can be satisfied by goods and services.Secondary needs are the desires and wants that become important when primary needs are satisfied. Definition (2): Secondary needs are connected with the desire for satisfaction and pleasure of the human being: designer articles or furniture, the high-tech and the newest cell phone, jewelry, a luxury car, etc.

お役に立てば幸いです

8 0
2 years ago
What is the name of the supercontinent that existed 245 million years ago
Mandarinka [93]
I believe it was Pangaea but I could be wrong
6 0
3 years ago
Read 2 more answers
Silver nitrate reacts with calcium to make calcium nitrate and silver. The reaction is exothermic and produces 18.7 kJ/mol of en
denis-greek [22]

Answer:

1.63 kilo Joules of energy will be produced when 14.8 g of silver nitrate react.

Explanation:

AgNO_3+Ca\rightarrow Ag+CaNO_3,\Delta H_{rxn}=-18.7 kJ/mol

Mass of silver nitrate = 14.8 g

Moles of silver nitrate = \frac{14.8 g}{170 g/mol}=0.08706 mol

According to reaction, when 1 mole of silver nitrate reacts with 1 mole of calcium it gives 18.7 kJ of heat.

Then amount of heat released when 0.08706 moles of silver nitrate reacts :

0.08706\times 18.7 kJ=1.628 kJ\approx 1.63 kJ

1.63 kilo Joules of energy will be produced when 14.8 g of silver nitrate react.

6 0
2 years ago
I need a background information for this lab report if anyone could help me please :((( it's due tomorrow
UkoKoshka [18]
So the whole point is that you need a abstract.
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