CHEMISTRY MIDDLE SCHOOL

What is special about nitrogen,and what is its main function in the atmosphere

Answers

Answer 1
Answer: the important thing about Nitrogen is that it provides air for humans to breathe in, 78% of the air we breathe in is Nitrogen and only 21% is oxygen, 1% is other gases. If the air was pure oxygen then everything would be extremely flammable, and it would also be harmful to humans. Nitrogen plays a very important role in our lives. Oxygen can be poisonous if it was the only gas in the air... we would initially all die if nitrogen wasn't in our atmosphere  

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Which is true according to the law of conservation of energy?
True or False A single replacement reaction is a reaction in which one element replaces a similar element within a compound
Fill in the blanks with the words in the following list. apron doing MSDS drink eat mix goggles safety shower water acids Rule number one in laboratory safety is know what you are doing . The best protections from chemical splashes and spills are an ________ to cover your body and _________ for your eyes. Never eat food or drink liquids from a lab container, even if it has been thoroughly washed. Rinse skin thoroughly with water after a chemical splash. A _________ should be used for more significant spills. Pour acids into water, never the other way around. Do not mix chemicals unless you know what the product of the reaction will be. A _________ describes important safety and reactivity information about a chemical. Fill in the blanks please

A typical carbon atom has six protons, six neutrons, and six electrons. Which of these has the least amount of mass?A) one Proton
B) one Neutron
C) six Electrons
D) These masses are too tiny to measure

Answers

Answer:

C

Explanation:

Answer:

six electrons

Explanation:

Electrons have almost virtually no mass and much less than a proton and neutron.  

(a neutron and electron have about 1 amu while electrons have 0.000548 amu)

What are the components of clean air?

Answers

Using information I've learned doing GCSE core science, the air should contain:

78% Nitrogen (N2)
21% Oxygen (02)
0.035% Carbon Dioxide (CO2)
Fluctuating proportions of noble gases (such as argon) and water vapour

There are also trace amounts of many other gases.
In clean air there are 5 elements present.
Argon
Carbon Dioxide
Nitrogen
Oxygen
and Hydrogen
Hope this helps! :)

What is a group of atoms bonded together

Answers

A group of atoms bonded together is called a molecule. I hope this helped. :)
the group of atoms held together by covalent bonds is called a molecule

Coal, oil, and natural gas A.
are renewable natural resources.

B.
are in very short supply for consumers.

C.
release carbon dioxide when they are burned.

D.
are clean fuels that contribute little to pollution.

Answers

Coal, oil, and natural gas C) release carbon dioxide when they are burned. They are non-renewable resources, but they are in large supply to consumers, and they are also NOT clean fuels and contribute greatly to pollution. 

answer- release carbon dioxide when burned

coal, oil, and natural gas release carbon dioxide when they are burned and definitely contribute to air pollution.

Which variables can affect the speed of a chemical reaction? (Choose all that apply)A.) Addition of inhibitor

B.) Change in concentration of reactant

C.) Temperature

D.) Particle size

Answers

The variables which can affect the speed of a chemical reaction are inihibitor, concentration, temperature and particle size.

What is the speed of reaction?

Speed of any reaction also known as rate of reaction and it gives idea about the duration that at how much time it will complete.

  • Addition of inhibitor slows down the speed of the reaction as inhibitor blocks the activity of the reactants.
  • Change in concentration of reactant also chnages the speed of the reaction because it completely depends on the reactant concentration.
  • Temperature changes also affect the speed of the reaction as it changes the kinetic property of the reaction.
  • Particle size provides the surface area to get react so changes in this property will also changes the speed of the reaction.

Hence all of the above will changes the speed of the reaction.

To know more about speed of reaction, visit the below link:

brainly.com/question/15841605

Your answer is B(I'm not very much sure about this one), C, and D.

I hope very much that I am correct, hope this helps you.

~Onyx~

Aaron is visiting a national park in Pennsylvania. The ranger tells Aaron that he is unlikely to see any groundhogs because it is winter.Which of the following is the most likely reason Aaron would NOT see any groundhogs?

The groundhogs are hibernating.

The groundhogs migrated.

The groundhogs have died out.

The groundhogs are gathering food.

Answers

Answer:

The groundhogs are hibernating.

Explanation:

Groundhogs hibernate during the winter months and don't come out of their burrows.
The groundhogs are hibernating, during winter
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