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kirill115 [55]
3 years ago
14

Scientist are always learning new things. which of the following shows how scientist use observations to gain new understanding

about the world?
A. scientists have discovered new planets orbiting a star by detecting a wobble in the star's motions.
B. Scientists hope to learn more about how many stars are in space.
C. Scientists are familiar with some galaxies, but they do not know how many galaxies exist.
D. Scientist wonder if other plants can support life, and some scientist wonder if there are aliens.
Chemistry
2 answers:
irga5000 [103]3 years ago
7 0

Answer:

A. scientists have discovered new planets orbiting a star by detecting a wobble in the star's motions.

Explanation:

As can be seen from the options only first option shows an observation. Here the scientists observed the wobbling of the stars and through that they deduced that there will be planets orbiting around that star. This deductions stands true as the gravity of the planet affects the motion of the star as well. Other options do not show such instances.

BartSMP [9]3 years ago
4 0
The answer is A because it is showing how they made an observation
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AlexFokin [52]

Answer:

2C₂H₆ +  [7]O₂     →      [4]CO₂ + [6]H₂O

Explanation:

Chemical equation:

C₂H₆ +  O₂     →      CO₂ + H₂O

Balanced chemical equation:

2C₂H₆ +  7O₂     →      4CO₂ + 6H₂O

Step 1:

2C₂H₆ +  O₂     →      CO₂ + H₂O

Left hand side                      Right hand side

C = 4                                     C = 1

H = 12                                    H = 2

O = 2                                     O = 3

Step 2:

2C₂H₆ +  O₂     →      4CO₂ + H₂O

Left hand side                      Right hand side

C = 4                                     C =  4

H = 12                                    H = 2

O = 2                                     O = 9

Step 3:

2C₂H₆ +  O₂     →      4CO₂ + 6H₂O

Left hand side                      Right hand side

C = 4                                     C =  4

H = 12                                    H = 12

O = 2                                     O = 14

Step 4:

2C₂H₆ +  7O₂     →      4CO₂ + 6H₂O

Left hand side                      Right hand side

C = 4                                     C =  4

H = 12                                    H = 12

O = 14                                     O = 14

3 0
3 years ago
What is the mass of a glucose solution that fills a 0.500-L intravenous bottle if the density of the glucose solution is
____ [38]

Answer:

m = 575 g

Explanation:

Given data:

Volume of solution = 0.500 L (0.500×1000 = 500 mL)

Density of glucose solution = 1.15 g/mL

Mass of glucose solution = ?

Solution:

Formula:

d = m/v

d = density

m = mass

v = velocity

Now we will put the values in formula.

1.15 g/mL = m/500 mL

m = 1.15 g/mL × 500 mL

m = 575 g

3 0
4 years ago
Explique las diferencias entre mezcla y combinación. De un ejemplo de cada uno.
Brums [2.3K]

Answer:

He means Explain the differences between mix and match. Give one example of each.

Explanation:

3 0
3 years ago
Which of the alkali metals are liquids at 50°C?
luda_lava [24]
Hello!

I believe the correct answers are: Bromine (Br) and Mercury (Hg).

I really hope this helped you out! :)
3 0
3 years ago
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TEA [102]

Answer: Option (D) is the correct answer.

Explanation:

Need means necessity without which a person might not be able to survive for long.

For example, food is a need for every living being as without it any individual cannot survive for a long period of time.

Similraly, shelter is also a need and insurance is also necessary as it protects an individuals life or his savings so that after his death the future of his family remains protected.

Whereas cable TV is not a need as an individual can survive without it. Therefore, a cable TV is a want.

3 0
3 years ago
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