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2 years ago

Food chains always begin with what type of organism? Why?

Chemistry

1 answer:

Inessa05 [86]2 years ago

6 0

The food chain always begins with a sun without it there would be no food chain... hope this helped!

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how to determine the aspects for core and valence electrons in a periodic table. How comes in some elements like cobalt the 3d i

dusya [7]

Answer:

See explanation

Explanation:

The electron configuration of an atom in an element determines the property of the atom. The core electrons are found inside the atom while the valence electrons are found on the outermost shell of the atom.

For cobalt, the outermost shell electron configuration is; [Ar] 3d7 4s2. The 3d7 and 4s2 are found in the valence shell of cobalt.

For arsenic, the electronic configuration is [Ar] 3d¹⁰ 4s² 4p³. The valence electrons are 4s2, 4p3. The 3d electrons are found inside the arsenic atom.

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2 years ago

Mercury orbits the sun at more than ten times the sun speed of Neptune

marysya [2.9K]

Answer: Yes, this is true.

Explanation: It only takes 88 days for Mercury to orbit around the sun. No other planet travels around the sun faster.

8 0

2 years ago

5. Why was the Chandra X-ray Observatory most likely placed in Earth's orbit above

Rus_ich [418]

Answer:

c or d I think but I'm not completely shure

7 0

2 years ago

A student has 100. mL of 0.400 M CuSO4(aq) and is asked to make 100. mL of 0.150 M CuSO4(aq) for a spectrophotometry experiment.

ValentinkaMS [17]

Answer:

a. 37.5 mL

b. See the description below

Explanation:

a. Volume of 0.400 M CuSO₄(aq) required for the preparation

In dissolutions, since the number of moles of solute is constant, the equation is:

$C_1\times V_1=C_2\times V_2$

Substitute and solve for V₁

$0.400M\times V_1=0.150M\times 100ml$

$V_1=0.150M\times 100.ml/0.400M=37.5ml$

b. Briefly describe the essential steps to most accurately prepare the 0.150 M CuSO₄(aq) from the 0.400 M CuSO₄(aq)

You will use the stock solution, the funnel, the buret, and distilled water.

i) Using the funnel, fill in the buret with with 50 ml of the stock solution, i.e. the 100. ml of 0.400 M CuSO₄(aq) solution.

ii) Pour 37.5 ml of the stock solution from the burete into the volumetric flask.

iii) Carefully add disitlled water to the 37.5ml of the stock solution in the volumetric flask until the mark (50 ml) on the volumetric flask.

iv) Put the stopper and rotate the volumetric flask to homegenize the solution.

3 0

3 years ago

Explain the Earth's motion through space, including precession, nutation, the barycenter, and its path about the galaxy.

Vesna [10]

The Earth spins on its axis and revolves around the Sun. The tilt of its axis with respect to the Sun causes the Earth's seasons. The Earth also follows the Sun's rotation around the center of the Milky Way galaxy, which is moving through space.

3 0

3 years ago

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