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Pani-rosa [81]
2 years ago
8

When the moon moves directly between the sun and Earth and casts its shadow over part of Earth, you are

Chemistry
2 answers:
Vikki [24]2 years ago
8 0
C lunar Eclipse should be correct
chubhunter [2.5K]2 years ago
7 0

Answer:C

Explanation:you are seeing a lunar eclipse when the moon moves directly between the sun and the earth and casts a shadow. Hope this helps!

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Cuando el oxígeno reacciona con el calcio produce un sólido blanco muy utilizado en la preparación de cementos. ¿Cuál de las sig
8_murik_8 [283]

Answer:

2Ca + O₂ → 2CaO

Explanation:

Cuando el Calcio (Ca) reacciona con oxígeno (O₂) se produce cal (CaO). La cal es un sólido inodoro de color blanco a grisáceo. La cal es un óxido que se encuentra presente en el cemento y su cuantificación permite determinar la calidad y el tipo de cemento a utilizar.

La reacción que describe el proceso anterior es:

Ca + O₂ → CaO

Para balancear los oxígenos, se deben poner 2 CaO como producto:

Ca + O₂ → 2CaO

Para balancear los calcios, se pone como coeficiente del Ca un 2:

<h3>2Ca + O₂ → 2CaO</h3><h3 />

Esta última es la reacción que describe el proceso anterior

6 0
2 years ago
Concentrated hydrochloric acid is approximately 12.2 M. If a student needs to prepare 250. mL of 0.500 M hydrochloric acid, what
Mice21 [21]
Answer:
Would it be 10.2 mL? I used the formula M1V1=M2V2
Explanation:
I think the person that asked it correct

5 0
1 year ago
What is the concentration of a solution if 0.450 mol of NaCl dissolved in 750 mL of water?
Thepotemich [5.8K]

Answer:

.6mol/L

Explanation:

molarity = number of moles / volume of solvent (in L)

750mL / 1000mL/L = .75L

M = .450mol / .75L

M = .6mol/L

3 0
3 years ago
What is the oxidation number of boron in Na2B4O7
makkiz [27]
The answer is 4. Hope it helps!
7 0
3 years ago
Question 2 (1 point)
kondor19780726 [428]

Answer:

D. A pond freezing over is not a chemical reaction, it is a physical reaction.

8 0
2 years ago
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