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Sati [7]
3 years ago
12

kepler's first law explains that the sun is the focus of our solar system, and that _____. the orbit of a planet around the sun

is an ellipse the speeds of the sun, moon, and stars are perfectly uniform and unchanging the orbits of the sun, moon, and stars are perfect circles the moon is not in orbit around the sun
Chemistry
2 answers:
alexgriva [62]3 years ago
5 0
Kepler's first law explains that the sun is the focus of our solar system, and that A. <span>the orbit of a planet around the sun is an ellipse. Kepler proved that the orbit of the sun is an elliptical path and is used to derive the motion of the satellites and space vehicles today.</span>
kaheart [24]3 years ago
4 0

The correct answer is A) the orbit of a planet around the sun is an ellipse the speeds of the sun.

Kepler's first law explains that the sun is the focus of our solar system and that the orbit of a planet around the sun is an ellipse the speeds of the sun.

The three laws of Kepler are the following. The Law of Orbits: all planets move in an elliptical orbit, with the sun at one focus.

The Law of Areas: a line that connects a planet to the sun sweeps out equal areas in equal times.

The Law of Periods: the square of the period of a planet is proportional to the cube of the semimajor axis of its orbits.

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A mixture of iron and sulfur can be separated by attracting the Iron particles with a magnet. If the iron and sulfur mixture is
kicyunya [14]

Answer:B

Explanation: It is a compound

8 0
3 years ago
The CDC recommends that levels of lead in adults be no greater than 40 ug per dL of blood. At that level a) how many grams of le
irakobra [83]
There are ten dL in one litre, so an ideal amount of lead in a litre of blood would be no greater than 400 micrograms (ug)

There's 1000mL in a litre, so we're looking at 0.4ug of lead or less in a millilitre. 1mol of lead atoms weighs about 207.2g, therefore there's about 2.907 × 10^21 atoms per gram, or about 1.163×10^14 atoms in 0.04ug. Therefore there should be no more than 1.2×10^14 atoms of lead per millilitre.
7 0
3 years ago
Which of the following gases is formed during photosynthesis? (1 point)
Karolina [17]

Answer:

carbon dioxide hope I helped please mark brainliest

7 0
3 years ago
During a phase change, the temperature of a substance _____.
adell [148]

Answer: remains constant.


Justification:


1) The phase changes are:


i) Boiling: pass from liquid to gas (absorbs heat energy)

ii) Condensation: pass from gas to liquid (release heat energy)

iii) Melting: pass from solid to liquid (absorb heat energy)

iv) Freezing: pass from liquid to solid (release heat energy)

v) Sublimation: pass from solid to gas (absorbs heat energy)

vii) Deposition: pass from gas to solid (release heat energy)


2) When a phase change occurs, whichever it is, the heat energy related with the process, either absortion or release, is used, to overcome the intermolecular forces (in the case of heat energy absortion) or to create stronger intermolecular forces (in the case of heat energy release).


Because of that, the heat energy exchange does not change the temperature of the substance.

8 0
3 years ago
Read 2 more answers
The reaction 2CH4(g)⇌C2H2(g)+3H2(g) has an equilibrium constant of K = 0.154. If 6.30 mol of CH4, 4.20 mol of C2H2, and 11.15 mo
boyakko [2]

Answer:

C₂H₂ + 3H₂ ⟶ 2CH₄  

Explanation:

The initial concentrations are:

[CH₄] = 6.30 ÷ 6.00 =   1.05  mol·L⁻¹

[C₂H₂] = 4.20 ÷ 6.00 = 0.700 mol·L⁻¹

   [H₂] = 11.15 ÷  6.00 =  1.858 mol·L⁻¹

                2CH₄ ⇌ C₂H₂ + 3H₂

I/mol·L⁻¹:    1.05     0.700   1.858

Q = \dfrac{\text{[C$_{2}$H$_{2}$][H$_{2}$]}^{3}}{\text{[CH$_{4}$]}^{2}} = \dfrac{ 0.700\times 1.858^{3}}{1.05^{2}}= 4.07

Q > K

That means we have too many products.

The reaction will go to the left to get rid of the excess products.

C₂H₂ + 3H₂ ⟶ 2CH₄

8 0
4 years ago
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