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Mumz [18]
3 years ago
5

A single atom of an element has 21 neutrons, 20 electrons, and 20 protons. Which element is it?

Chemistry
1 answer:
sukhopar [10]3 years ago
3 0

Answer:

ca

Explanation:

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At a given temperature, 300m of carbon dioxide has a mass of 5.94kg. What is the density of carbon dioxide at this temperature
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I think the would have to be 0.198kg/g
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Which of the following properly describes the movement of atoms as they represent the states of matter? Atoms making liquids hav
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Answer:

Atoms making liquids have less attraction than solids, but more than gases

Explanation:

The attraction between atoms in different molecules in a solid is very strong due to strong intermolecular forces present in a solid. However, such intermolecular forces are weaker in liquids than in solids.

This implies that the solid has higher intermolecular forces of attraction compared to gases and liquids. Based on the negligible degree of intermolecular forces between them, a gas has the weakest intermolecular forces hence the atom has very minimal interaction between them.

7 0
3 years ago
What do hydroligists primarly study
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The study of movement, distribution and quality of water.

Explanation:

They measure the properties of bodied of water, such as the volume of and stream flow.

4 0
3 years ago
How many atoms are there in 2.0 moles of magnesium (Mg)?
hjlf

Answer:

It should be 1. 1.2 X 10^24

Explanation:

7 0
2 years ago
PLEASE HELP AND EXPLAIN!Calculate the energy required to heat 187.0 g of ammonia from 36.1 °C to 52.9 °C. Assume the specific he
Alenkinab [10]

Answer:

E=1.48x10^4J

Explanation:

Hello!

In this case, since the energy implied in a heating process is computed by using the following equation:

E=mC(T_f-T_i)

Whereas m is the mass, C the specific heat and T the temperature. In such a way, by plugging in the given mass, specific heat and temperatures, we obtain the following energy:

E=187.0g*4.703\frac{J}{g\°C} (52.9\°C-36.1\°C)\\\\E=1.48x10^4J

Considering that the specific heat can by used by unit of °C or K because their difference is equivalent.

Regards!

3 0
2 years ago
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