CHEMISTRY MIDDLE SCHOOL

Which of the following resources is renewable?A.copper



B.diamonds



C.wood



D.fossil fuels

Answers

Answer 1
Answer: Wood is renewable. This is because more trees can always be planted. All the other choices are non-renewable.
Answer 2
Answer: Wood because you can plant more trees to make wood

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According to scientific evidence, earth’s earliest atmosphere lacked oxygen. Over time, oxygen was added to the atmosphere.Which statements explain how this change occurred and how it affected life on earth?

Choose all answers that are correct.

A.
The addition of oxygen to the earth's atmosphere helped make possible the development of eukaryotic organisms, which need oxygen to carry out many of their life processes.

B.
When cyanobacteria evolved, they carried out photosynthesis. Oxygen is a product of photosynthesis. The addition of oxygen to earth’s atmosphere helped make possible the development of eukaryotic organisms, which need oxygen to carry out many of their life processes.

C.
The addition of oxygen to the earth's atmosphere helped make possible the development of prokaryotic organisms, which need oxygen to carry out many of their life processes.

D.
When cyanobacteria evolved, they carried out photosynthesis. Oxygen is needed to carry out photosynthesis.

Answers

B.
The cynobacteria were already there without the oxygen, so that rules out A, and a lot of prokaryotes were anaerobic, so that rules out C. Finally, Photosynthesis does not require oxygen. Instead, Oxygen is a waste product of it. Therefore, it cannot be D. So, we are only left with B
Hoped this helped :D

What happens when water is added to a sand-salt mixture

Answers

Explanation:

It is known that common salt is NaCl and it is ionic in nature. As all ionic substances are able to dissolve in water because like dissolves like.

Hence, salt will easily dissolve in water.

On the other hand, sand is insoluble in water. Therefore, when sand is added to water then it will not dissolve in water.

Thus, we can conclude that when water is added to a sand-salt mixture then sane being insoluble will not dissolve and it will settle at the bottom after some time. Whereas salt being able to dissolve in water will readily dissolve.
The salt dissolves in the water and the sand will gather at the bottom.

If a sexually reproducing organism has 28 chromosomes in its body cells how many chromosomes did it inherit from each parent

Answers

14 from each parent. 14 x 2 = 28

Please help!!!!its due tomorrow !!!

Answers


#6).
Every 1,000 mL makes 1 L
How many 1,000mL are there in  2,800 mL ?
That's division.
                         (2,800 mL) / (1,000 mL) = 2.8 L

#7).
The 'perimeter' means the 'distance all the way around'.
You have to know that both sides of a rectangle are the same length,
and also the top and bottom are the same length.
So the perimeter of this rectangle is

   (2 yd) + (4.5 yd) + (2.yd) + (4.5 yd) = 13 yd .

Oops.  The problem wants to know the perimeter in feet.
So you have to know that each yard is the same as 3 feet.
In order to find the number of feet in 13 yards, you have to
take 3 feet 13 times .

       (3 feet) times (13)  =  39 feet .

#8).
For this one, you have to know that every 36 inches makes 1 yard.

How many 36 inches are there in 48 inches ?
That's division.
                         (48 inches) / (36inches)  =  1 and 1/2 yards .

#9).
For this problem, you have to know how to handle a mixed number,
and you also have to know that there are 16 ounces in 1 pound.

Add up the fruit:

             (3-1/2 pounds) + (4 pounds) + 2 pounds)  =  9-1/2 pounds

Now, remember that each pound is the same as 16 ounces.  So if you
want to find the number of ounces in  9-1/2 pounds, you have to take
16 ounces  9-1/2 times .

     (16 ounces) times (9-1/2) = 152 ounces.
___________________________________

#10).
This one is just adding up some numbers.  But after you finish doing that, you have to know that  1,000 meters is called '1 kilometer' .

Add up the distances that Omar ran:

   (1,000 meters) + (1,625 meters) + (1,500 meters)  =  4,125 meters

The problem wants to know how many kilometers this is, so you have to figure out how many '1,000 meters' fit into 4,125 meters.

That's division.

   (4,125 meters) / (1,000 meters)  =  4.125 kilometers

The speed of light is used to determine the length of a light-year. About how far does light travel in one second? A. 30 km B. 3,000 km C. 30,000 km D. 300,000 km

Answers

The answer would be D. 300,000 km/s

Fireworks exploding in the sky and giving off light are an example of a(n) _____. a. exothermic change
b. change in mass
c. physical change
d. endothermic change

Answers

Exothermic change. Because the firework when it exploded, released energy in the form of light. In exothermic changes energy is released, and in endothermic changes energy is absorbed.

- This wouldn't be a physical change, but instead a chemical change. A clue that it is a chemical change is that energy was given off.

the answer is A exothermic change
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