CHEMISTRY MIDDLE SCHOOL

Which of the following is an exothermatic reaction a) dissolving sugar in wat
b)melting ice
c)oxidation of iron
D) dissolvin ammonium nitrate in water to cool the water

Answers

Answer 1
Answer: C, oxidation of iron is the right answer because an exothermic reaction releases energy by light or heat!

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How does the Doppler effect related to the universal expanding?

Answers

The Doppler effect doesn't just apply to sound. It works with all types of waves, which includes light. Edwin Hubble used the Doppler effect to determine that the universe is expanding. Hubble found that the light from distant galaxies was shifted toward lower frequencies, to the red end of the spectrum. This is known as a red Doppler shift, or a red-shift. If the galaxies were moving toward Hubble, the light would have been blue-shifted.

[30 POINTS PLEASE HELP ASAP DUE TODAY]4.) Were you able to think of a nonliving thing with each characteristic? What examples did you think of?

Please no trolls, or I will have to report--

Answers

Non-living things don’t have the ability to move, grow, and reproduce. Examples of non-living things:

Rock
Well
Pie

Yes. I was able to think of non-living things suck as, a table and a chair and a countertop.

How are revolution and year related

Answers

Revolution means orbiting around another body. 
A year is a time for a planet to complete one orbit around the Sun.

Explanation:
The words revolution and year are connected as a result of a revolution. The definition of a revolution is that the movement of 1 object around a middle or an in a very given length of your time which may be measured in terms of years. and year may be a peroid or length of twelve month within which the eart revovle round the sun.
Revolution means orbiting around another body. 
A year is the time for a planet to complete one orbit around the Sun.

What is the difference between conduction and convection?

Answers

These are both ways heat travel. Conduction is when something is touching something i.e. When you touch a hot pan. Convection is heat rising, then cooling so it sinks and heats back up and rises again repetitively i.e. A convection oven (think circulation of heat)
CONVECTION is the transfer of heat from high temperature to low temperature with movement of mass or medium due to temperature difference in the region. Although, convection is a bit similar to conduction, but convection involves movement of substances. Such as wind system in our planet. Air moves due to temperature difference in every part of our planet. Then, CONDUCTION is the transfer of heat, of course from high temperature to low temperature when two objects (such as metals) are in direct contact (without the movement of metals).

What are some advantages of using less farm machinery in planting?

Answers

a. there will be less pollution.
b. less machinery=hiring workers=jobs.
c. If farm machinery broke in the field.  repairing is very inconvenient. There will be no trailer to pull it away. This is a disadvantage of machinery.

4. Allison is trying to identify the type of bacteria found on common surfaces like doorknobs, table tops, etc. For this experiment, she will collect samples of bacteria and allow them to grow for several days. Then, she will observe the bacterial colonies that are formed and compare their appearance with pictures of bacterial colonies in her textbook. Which of the following pieces of equipment will Allison most likely use for the growth of the bacteria?

Answers

You will use a....
Microscope
Graduated Cylinder
Beaker
Petri Dish
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