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ANTONII [103]
3 years ago
6

40 POINTS!

Chemistry
2 answers:
Temka [501]3 years ago
6 0

Answer:

They are chemical reactions that give off energy and increase the temperature of the surroundings.

Explanation:

Answer via Educere/ Founder's Education

kotegsom [21]3 years ago
3 0

Answer: Option B) They are chemical reactions that give off energy and increase the temperature of the surroundings.

Explanation:

Exothermic reactions are chemical reaction that occurs spontaneously and brings about the release of energy (in form of heat) to raise the temperature of their surroundings. Hence, the reacting vessel feels hot as the reaction proceeds to completion.

An example of exothermic reaction is the reaction between an acid and base

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Hydrogen gas caught fire quickly in the Hindenberg accident. In comparison, neon gas and helium gas are nonreactive. This is why
Phoenix [80]

Answer:

Helium and Neon have similar chemical properties because both of them completely fill the outer shell of their atoms' electrons, so there is nothing to share with other atoms, neither with the same element nor with any other element.

Explanation:  

Helium and Neon are both  noble gases . As elements react, their atoms, by losing, acquiring, or sharing electrons, complete their outer shells. Noble gas atoms already have full outer shells, so there is no tendency for them to lose, gain, or share electrons. There are incomplete outer shells of atoms of group 1 and 7 elements (so they are reactive)

<u>Chemical properties of HELIUM and NEON -: </u>

  • In group 8(or 0) of the periodic table, on the far right side, the Noble Gases are contained. Helium, neon, argon, krypton, xenon and radon are their names.
  • They are extremely colourless and unreactive.
  • They do not form bonds, so they still remain as single (monatomic) atoms.
  • There is very little chemical reactivity in them.

Hence, helium and neon have similar chemical properties as they are the most stable due to having the maximum number of valence electrons their outer shell can hold.

6 0
3 years ago
PLZZ!!!- I NEED THIS RIGHT NOWA block is pulled 0.90 m to the right in 2.5 s.
UNO [17]
The average speed is 0.28
4 0
4 years ago
Which of the following statements about the carbon cycle is NOT true?
nalin [4]

Answer:

Plants consume carbon through transpiration

Explanation:

In transpiration, plants lose water vapor through the stomata in their leaves. No carbon is involved in transpiration, which has an outbound direction. Nothing can be consumed through the stomata when vapor is going out of the plant. It´s like trying to get in through the exit.

3 0
4 years ago
Read 2 more answers
Calculate the mass m of 6.50 moles n of kbr m
crimeas [40]

Answer:

773.51495 grams

Explanation:

1 moles KBr to grams = 119.0023 grams

6.5*119.0023 = 773.51495 grams

8 0
3 years ago
What do you have to do before you preform your experiment?
Darina [25.2K]

Answer:

form hypothesis

Explanation:

7 0
3 years ago
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