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sesenic [268]
3 years ago
11

Which statements describe dark matter? Check all that apply. It is invisible. It is the same as dark energy. It is well understo

od by scientists. It does not emit electromagnetic radiation. It can be observed by shifts in red and blue light.
Chemistry
2 answers:
Llana [10]3 years ago
7 0

Answer:

Space that appears empty actually contains dark energy and dark matter.

Dark matter does not emit electromagnetic radiation.

Scientists theorize that dark energy is causing the expansion of the universe to accelerate.

JUST TOOK THE ASSESSMENT!

Alla [95]3 years ago
4 0

Dark matter is invisible and does not emit electromagnetic radiation. Dark matter is part of a theory that hypothesis the existence of a counterpart to the particles we know in physics, in order to balance the universe that otherwise would be largely unbalanced right now. However, the theory right now is not yet proven.

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Consider the following chemical reaction of bromothymol blue indicator. It appears yellow in undissociated form and blue in its
TiliK225 [7]

The addition of hydrogen carbonate to bromothymol blue turns the solution blue. Thus, option B is correct.

The balanced equation for the dissociation of bromothymol blue is:

\rm HC_2H_3O_2\;\leftrightharpoons H^+\;+\;C_2H_3O_2^-

The color of dissociated form is yellow and undissociated form is blue.

<h3>What is the final color of solution?</h3>

The addition of hydrogen carbonate results in the dissociated ions as:

\rm H_2CO_3\;\rightarrow\;2\;H^+\;+\;CO_3^-

The dissociation results in the increased hydrogen ion concentration. The undissociated form in the reaction mixture increases.

Thus, the color of the solution will turn blue. Hence, option B is correct.

Learn more about bromothymol blue, here:

brainly.com/question/24319054

6 0
3 years ago
How many carbon atoms are in each mole of calcium carbonate?
xeze [42]

Answer:

5 atoms are in each molecule of calcium carbonate

6 0
3 years ago
10. Which of these measurements have four significant figures? *
anastassius [24]

Answer:

3.050 g

Explanation:

6 0
4 years ago
PLEASE HELP: What are the reactants?
g100num [7]

Answer:

Reactants are substances that start a chemical reaction, and products are substances that are produced in the reaction

Explanation:

Hope This Helps

8 0
3 years ago
Earth is approximately 1.5 x 10^8 km from the sun the. How far is earth from the sun meters
Zielflug [23.3K]

Answer:

{ \tt{1 \: km = 1000m}} \\ { \tt{1.5  \times {10}^{8} km =  (\frac{1.5 \times  {10}^{8} \times 1000 }{1} )m}} \\  = 1.5 \times  {10}^{11}  \: metres

4 0
3 years ago
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