CHEMISTRY MIDDLE SCHOOL

Which of these is an example of a physical change?A) iron melting
B) steel rusting
C) paper burning
D) wood decaying​

Answers

Answer 1
Answer:

A physical change changes the state on object is in, making the answer A) iron melting. Since it's melting, it's going from solid to liquid.

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suppose you increase the mass of wood you are burning in a fireplace. what will happen to the total mass of ash what will happen to the total mass of ash,gases,and water vapor

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Due to the law of conservation of mass, the mass in the end of the change will remain the same.

A ten mile area of trees is removed from the tropical rainforest. How will this affect the amount of water and the amount of oxygen in the area?

Answers

We know that the roots of the trees would absorb the water under the ground. This is necessary for photosynthesis. Photosynthesis would produce food for the tree and as by product, oxygen is produced. Removing the tree would decrease the water consumption but would also decrease the oxygen production. 

Removing the tree would decrease the water consumption but would also decrease the oxygen production.

What is a tropical rainforest?

Tropical rainforests are found in Central and South America, western and central Africa, western India, Southeast Asia, the island of New Guinea, and Australia.

Sunlight strikes the tropics almost straight on, producing intense solar energy that keeps temperatures high, between 21° and 30°C (70° and 85°F).

Deforestation has an adverse affect on air by reducing the amount of oxygen and increasing the amount of carbon dioxide as well as contributing to global warming.

Photosynthesis would produce food for the tree and as by - product, oxygen is produced.

Removing the tree would decrease the water consumption but would also decrease the oxygen production.

Learn more about tropical rainforest here:

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Does chocolate milk come from brown cows?

Answers

chocolate milk is just regular white milk that has chocolate syrup/powder mixed into it
So no, chocolate milk does not come from brown cows

Hope this helps

No Nope Notta, zilch

HURRY!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!One object has a speed of 1 mph and another object has a speed of 3 mph. If the masses are the same, which of the following is true about their kinetic energy?

Question 7 options:

Their speeds are the same.

the object with the greater speed has greater kinetic energy


the object greater speed has the lower kinetic energy


the object with the smaller mass has the greater kinetic energy

Answers

Answer: Option (B) is the correct answer.

Explanation:

Kinetic energy is the energy due to the motion of an object.

Mathematically,       K.E = (1)/(2)mv^(2)

where            m = mass

                      v = velocity

Therefore, an object whose velocity is more will have more kinetic energy.

Thus, we can conclude that out of the given options, the object with the greater speed has greater kinetic energy is true about their kinetic energy.
The object with the greater speed has greater kinetic energy

How can you demonstrate that helium takes up space?

Answers

a balloon can be filled with helium

 

Which atomic number corresponds to the element which is most stable?1
3
8
16
36

Answers

Answer:

36

Explanation:

Hope this helps

PLEASE MARK AS BRAINLIEST !!!!

Answer:

36

Explanation:

This is a simple answer, but I assure you that it is 100% correct.

Hope this helps you.

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