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Inga [223]
2 years ago
10

Calcium has an atomic number of 20. An atom of calcium has ____ electrons in its first energy level and ____ electrons in its se

cond energy level.
Chemistry
1 answer:
kotykmax [81]2 years ago
4 0
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Snow forms when clouds cool to the dew point. True False
Paha777 [63]

Answer:

False.

Explanation:

Snow forms when tiny ice crystals in clouds stick together to make snowflakes.

3 0
3 years ago
two critical requirements must be met before light elements, like hydrogen or helium, will fuse and form heavier elements. The t
svlad2 [7]
I had to look for the options and here is my answer:
The two requirements for nuclear fusion that are needed to be met in order for the elements hydrogen and helium fuse to make heavier elements are extremely high temperatures and density. Hope this helps.
4 0
3 years ago
Read 2 more answers
Explica brevemente cuidado del aparato digestivo ​
kirill115 [55]

Answer:

For better digestive health, follow these simple tips:

Eat a high-fiber diet. ...

Be sure you're getting both soluble and insoluble fiber. ...

Minimize your intake of foods high in fat. ...

Select lean meats. ...

Add probiotics to your diet. ...

Follow a regular eating schedule. ...

Drink plenty of water.

Explanation:

6 0
3 years ago
Which characteristic is a property of water?
Rus_ich [418]

Answer: The correct answer is option (A).

Explanation:

Polar molecules are molecules in which formation of partial charges takes place due to which dipole moment gets created in a molecule. Molecules with polar bonds that s bond with partly ionic character. And water is of the example of polar molecule.

Electronegative oxygen atom in water molecule attracts the electron bond pair towards itself which generates partial negative charge on oxygen atom and partial positive charge on both hydrogen atoms.

Where as water has higher value surface tension due to strong intermolecular association of the water molecule due to presence of hydrogen bonding.And it is more denser is liquid state than in its solid state.

Hence,the correct answer is option (A).

 

5 0
3 years ago
The chemical reaction in which solid calcium oxide is treated liquid water is an example of what: A) decomposition B)combustion
laiz [17]

Answer:

The chemical reaction in which solid calcium oxide is treated liquid water is an example of Synthesis reaction. Hence, the answer is (D) Synthesis.

Explanation:

The formula of Calcium Oxide is CaO.

The formula of liquid water is H₂O.

Calcium Oxide reacts with water and forms Calcium Hydroxide. The Chemical equation is shown below.

CaO + H₂O --> Ca(OH)₂.

This is a Synthesis reaction because Ca(OH)₂ is synthesized by using Calcium Oxide and water.

The product of this reaction is calcium hydroxide, also known as slaked lime.

Thus, when calcium oxide reacts with water, slaked lime is produced.  

Calcium oxide is also known as lime and is most commonly used for many purposes. It can be used for pH correction of water or for its disinfection (with excess lime).

8 0
3 years ago
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