Chemistry Middle School

Are the orbits of the planets could you pls help!!!! Pls don't send scam links !! in the solar system as they revolve around the Sun perfectly
circular?
Explain.

Answers

Answer 1

Answer: Orbits are elliptical, Sun is in focal point of the ellipse.

Explanation:

Orbits are not perfect circles. Distance of Earth from Sun is between

147 million kilometres - 152 million kilometres. When Earth is in closest point of the Sun it moves faster tant in the point which is most far away from Sun.

Kepler´s Laws give more information.

Related Questions

please help!

a b c or d

Answers

Answer:

A glass pane / A.

Explanation:

Examples of insulators include plastics, Styrofoam, paper, rubber, glass and dry air. The division of materials into the categories of conductors and insulators is a somewhat artificial division.

Answer:

the answer is A

Explanation:

Choose any electromagnetic wave we have discussed and write ONE PARAGRAPH telling me about the uses/benefits of that electromagnetic wave.

Answers

Radio waves are used for communication such as television and radio. Radio waves are transmitted easily through air. They do not cause damage to the human body and they can be reflected to change their direction. These properties make them ideal for communications

Students in a chemistry class added 5 g of Zinc (Zn) to 50 g of hydrochloric acid (HCl). A chemical reaction occurred that produced zinc chloride (ZnCl2) and 6 g of hydrogen gas (H2).

Zn+ 2HCl → ZnCl2+H2

What is the mass of the zinc chloride?

Answers

Answer: 11 g

Explanation:

Zn + 2HCl    →   ZnCl₂ + H₂

Number of moles of Zn:

Number of moles = 5 g / 65.38 g/mol

Number of moles = 0.08 mol

Number of moles of HCl :  

Number of moles = 50 g / 36.5 g/mol

Number of moles = 1.4 mol

Compare the moles of both reactant with zinc chloride:

             Zn             :           ZnCl₂

              1             :             1

             0.08       :        0.08

           HCl          :         ZnCl₂

             2            :           1

            1.4          :         1/2×1.4 =0.7 mol

The number of moles of zinc chloride produced by Zn are less so it will limit reactants.

Mass of zinc chloride:

Mass = 0.08 mol × 136.3 g/mol

Mass = 11 g

The answer is 11
First you need to find the limiting reactant
n (Zn) = m/MM = 5/65.38 = 0.076 ≈ 0.08
ratio = moles/coefficient = 0.08/1 = 0.08

n(HCl) = m/MM = 50/36.45 = 1.37
ratio = moles/coefficient = 1.37/2 = 0.685

So the limiting reaction is Zn

0.08/1 = x/1
x= 0.08 moles of ZnCl2

Then u need to find the mass
m= n(MM) = 0.08 (136.28) = 10.9 ≈11

question #5: corals are sensitive to temperature . if temperatures are raised , it will cause the coral to bleach . what does bleach mean ? And can corals recover ?

Answers

Answer:

It means the coral will turn white and corals may recover (depending on the species) by soaking up ocean surface heat.

Soda pop is carbonated with CO2. Mark puts one bottle of soda pop in the refrigerator and leaves the other out in the hot sunlight. After one hour, he opens both bottles. Which bottle will likely have more fizzing and bubbles? Why?​

Answers

The soda in the fridge will have more bubbles, because when u leave a carbonated drink in the heat it becomes flat. And the carbonation goes away.

plz helppppppppp meeeeeeeeeeeeeeee

Answers

4. Obsidian - rapid cooling when lava flows into water.

Granite - very slow cooling such as what occurs when magma is trapped beneath Earth's surface.

Basalt - cooling when lava flows over land

5. They are slightly simplistic and rock formation is not limited to only these methods.

6. They give a general overview of how a certain type of rock may be formed and how to identify them from a basic level based on their location.

Which human body system creates the force that allows the body to move?
A.
musculoskeletal system
B.
nervous system
C.
respiratory system
D.
circulatory system

Answers

Musculoskeletal system because the mussels help move your bones.
A musculoskeletal system

Choose any electromagnetic wave we have discussed and write ONE PARAGRAPH telling me about the uses/benefits of that electromagnetic wave.

Answers

Answer:

UV Rays

Here are some points you can add

•used to sterilise equipment from microbacterial organisms

•used to create fluorescence mechanism

•used to purify air

•used to tenderize meat

•can be implemented in medical and dental practices

•water purification

•stimulates vitamin d production

HELPPP this is a k12 so any links or false with be blocked or banned

Answers

Answer:

Sea level rise is caused by several different processes, including melting ice. But one big contributor to sea level rise is increasing global temperatures, which heat seas and cause something called thermal expansion of water. Thermal expansion happens when water gets warmer, which causes the volume of the water to increase. About half of the measured global sea level rise on Earth is from warming waters and thermal expansion.

Explanation:

I hope this helps

WILL MARK THE BRAINLEST

Answers

Answer:

a. Hh, hh

b. hh

c. 50%

d. 50%

C I think but if I’m wrong I’m really sorry
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