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kompoz [17]
3 years ago
11

Based on the periodic table, which of the following elements has properties most like neon’s?

Chemistry
2 answers:
Sonbull [250]3 years ago
7 0
D.krypton (Kr).............
ohaa [14]3 years ago
3 0

Answer:

<h2>D. Krypton (Kr)</h2>

<u>Explanation:</u>

because

Neon and Krypton, both are belongs to Inert or Noble gas Group

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How would adding the catalyst nitrogen monoxide (NO) affect this reaction?
RSB [31]

Answer: A) NO increases the rate at which SO_3 molecules are formed.

Explanation:

A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more reactant molecules can cross the energy barrier by undergoing collisions and convert to products.

2SO_2(g)+O_2(g)\rightarrow 2SO_3(g)

Thus NO will increase the rate of reaction by lowering the activation energy and thus the colllisions among SO_2 and O_2 molecules will incraese which in turn will lead to formatioon of more SO_3 molecules.

8 0
2 years ago
Which of the following naming rules would apply to CaCO3? A. metal + polyatomic anion B. polyatomic cation + nonmetal anion(ide)
Sveta_85 [38]
The naming rules for CaCO3 would be A. Metal+ Polyatomic Anion.
7 0
3 years ago
Read 2 more answers
Which of the following best describes temperature?
Nookie1986 [14]

Answer:

b

Explanation:

because motions make things hotter

6 0
3 years ago
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Which description correctly states the difference between a chemical and a physical property? A) Physical properties can only be
kolezko [41]

Answer:

C) Physical properties can be observed without changing into a new substance, while chemical properties are usually observable during a chemical reaction when a new substance is made.

Explanation:

Physical Change                                                                                              

The changes that occur only due to change in shape or physical properties but their chemical or internal composition remain unchanged.  

These changes were reversible.

They have same chemical property.

These changes can be observed with naked eye.

Example :

Water converting to Ice

Water converting to gas

In this water molecule remain the same only they rearrange themselves that change its state of mater not composition

Chemical change:

The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.

These changes are irreversible

These changes occur due to chemical reactions

These may not be observed with naked eye

Example:

Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood

Boiling of egg: that change the chemical composition of protein in the egg .

The reaction of Hydrogen and oxygen:

H 2 (g)  + O 2  (g) -------------------------------------> 2H 2O  (l)

5 0
3 years ago
Which element would you expect to be more metallic?<br> (a) Ca or Rb (b) Mg or Ra (c) Br or I
svlad2 [7]

Explanation:

When we move across a period from left to right then there will occur an increase in electronegativity and also there will occur an increase in non-metallic character of the elements.

As calcium (Ca) is a group 2A element and rubidium (Rb) is a group 1A element. Hence, Rb being an alkali metal is more metallic in nature than calcium (alkaline earth metal).

Both magnesium (Mg) and radium (Ra) are group 2A elements. And, when we move down a group then as the size of element increases so, it becomes easy of the metal atom to lose an electron.

As a result, there occurs an increase in metallic character of the element. Hence, Radium (Ra) is more metallic in nature than magnesium (Mg).

Also, both bromine and iodine are group 17 elements. Since, both of them are non-metals and non-metallic character increases on moving down the group.

Therefore, bromine (Br) is more metallic than iodine.

7 0
3 years ago
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