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vivado [14]
3 years ago
13

3. Why does å star begin shining?

Chemistry
2 answers:
steposvetlana [31]3 years ago
8 0

Answer:

a star shines due to thermonuclear fusion

Explanation:

Nimfa-mama [501]3 years ago
8 0

Answer:

If heated and intense enough nuclear fusion is in the center of the star will continue. It takes a star the size of our sun about 20 million years to reach this point. Once it starts nuclear fusion, the star can shine for about 10 billion years.

Explanation:

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Why might it be useful to determine the elements that a planet or moon is made up of?
GuDViN [60]

to see if its copatible with our environment or to see if there is any unkown element, otherwise i dont know

if wrong very sorry

5 0
3 years ago
Elements in the periodic are listed according to
sammy [17]

Answer:

the raising atomic number

Explanation:

Elements are listed on the periodic table according to their atomic number.

6 0
3 years ago
hich of the following changes always leads to an increase in the rate constant for a reaction: Decreasing the temperature Decrea
GrogVix [38]

Answer:

Only one—(i), or (ii), or (iii)—increases the reaction rate.

Explanation:

<em>Which of the following changes always leads to an increase in the rate constant for a reaction?</em>

  • <em>Decreasing the temperature. </em>NO. A lower temperature leads to a slower reaction because the molecules have less energy to react.
  • <em>Decreasing the activation energy</em>. YES. According to the Arrhenius equation, the lower the activation energy, the higher the rate constant.
  • <em>Making the value of ΔE more negative</em>. NO. A more negative ΔE means a reaction is more spontaneous but not faster.
4 0
3 years ago
HELP
Jobisdone [24]

Answer:

hello,

first one is 25.15

second is 301.55

Explanation:

honestly if you look up on the internet there is a converter to get you your answers

5 0
3 years ago
Read 2 more answers
Which of the following is a product of aerobic respiration?
sasho [114]

Answer:

The product of aerobic respiration is Carbon dioxide.

Explanation:

  • The process of breaking down glucose to produce energy and waste products is called respiration. Livings beings need respiration process to generate energy so  that they can survive.
  • The types of respiration are : Anaerobic and aerobic respiration.
  • Aerobic respiration takes place in presence of oxygen and produces large amount of energy.
  • The final product of aerobic respiration are carbon dioxide, water and 38 ATP of energy.
3 0
3 years ago
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