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Westkost [7]
2 years ago
10

Use your periodic table of elements. Take any element from the second column, except for beryllium and calcium, and answer the f

ollowing
questions: (5 points)
What is the element's name and symbol?
Is it a meial, nonmetal, or metalloid?
Which family does it belong to?
How many protons, neutrons, and electrons does its neutral atom have?
Chemistry
2 answers:
Alja [10]2 years ago
6 0

Answer:

Radium (Ra)

Metal

Alkaline Earth Metal

Protons & Electrons: 88

Neutrons: 138

Explanation:

Wittaler [7]2 years ago
3 0

Answer:

magnesium, Mg, metal, alkaline earth metals, its neutral atom has 12 protons and 12 neutrons and 12 electrons  

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54578 meters per second into miles per hour
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Answer:

54578 mps - 122087.51 mph

Explanation:

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3 years ago
8. What is the heat of reaction when hydrogen and oxygen combine to form water?
valina [46]

Answer:

The heat of reaction when hydrogen and oxygen combine to form water is :

<u>C. 571.6 kJ</u>

Explanation:

Enthalpy Change = The enthalpy change for the formation of 1 mole of the substance from their standard state is called the enthalpy of formation.

This is intensive quantity as it is fixed for 1 mole .

Intensive properties = Those properties which are independent on the amount of the substance are intensive properties.

The value of these quantities does not get halve if you divide the substance into two equal parts. example , density, refractive index.

However , the enthalpy of reaction is extensive. Because on increasing the amount the value of the enthalpy also get doubles

Hence for this reaction :

2H_{2}(g)+O_{2}\rightarrow 2H_{2}(l)

Its value is -285.8 kJ for 1 mole

And here two moles are present . so the value of molar enthalpy is:

-285.8 x 2 = -571.6 kJ

8 0
3 years ago
How does more greenhouse gases in the Earth's atmosphere affect earth's temperature?
Mumz [18]

Explanation:

Greenhouse gasses in Earth's atmosphere affect Earth's temperature by making it hotter. Greenhouse gasses make the Earth warmer by trapping heat. You can think of greenhouse gasses as Earth's blanket.

5 0
3 years ago
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Use the following equation to answer the questions below.
kaheart [24]

Answer:

1-Double replacement

Explanation:

3 0
3 years ago
Refer to the following illustration. How many hydrogen atoms could bond with oxygen?
WITCHER [35]
2. 

The reason why is because there are 2 available electron spots on the orbital for the oxygen atom. Hydrogen atoms have one proton and one electron, thus, in order to fill the oxygen atom orbital to a full outer shell, a maximum of 2 atoms could bond with the oxygen atoms. 

6 electrons (oxygen)+ 1 electron (hydrogen)+ 1 electron (hydrogen)= 8 
4 0
3 years ago
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