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2 years ago

Does gravity exist without air?

1 answer:

3 0

Mass is required for gravity. Higher mass implies higher gravitational drag. Most of these thoughts are tied to other planets without atmospheres, or the moon. The moon doesn't have any air or atmosphere and it pulls the Earth water.

Please correct any mistakes in my answer!! I'd be happy to fix it!! :)

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CaCl2 can be melted to produce calcium metal and give off chlorine gas. The equation for this is CaCl2(l) Ca(s) + Cl2(g). If 277

Bess [88]

Answer:

82g

Explanation:

CaCl2 : Ca 111g : 40g

227.45 : xg

xg= (40×227.5)/111

4 0

2 years ago

Read 2 more answers

Which of the following causes the formation of ionic bonds

pantera1 [17]

Answer: b. One atom transferring electrons to another atom

Explanation: An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element and the element which accepts the electrons is known as electronegative element. This bond is formed between a metal and an non-metal.

Covalent bonds are formed by sharing of electrons between non metals

For example, In calcium iodide the one electron from calcium metal gets transferred to iodine atom and thus form an ionic bond to give $CaI_2$

Electronic configuration of calcium:

$[Ca]=1s^22s^22p^63s^23p^64s^2$

Calcium atom will lose two electron to gain noble gas configuration and form calcium cation with +2 charge.

$[Ca^{2+}]=1s^22s^22p^63s^23p^6$

Electronic configuration of iodine:

$[I]=1s^22s^22p^63s^23p^64s^23d^{10}4p^5$

Iodine atom will gain one electron to gain noble gas configuration and form iodide ion with -1 charge.

$[I^-]=1s^22s^22p^63s^23p^64s^23d^{10}4p^6$

7 0

2 years ago

How many molecules are in 21.5G of water

NemiM [27]

Answer:

There are 6.022×1023 molecules in a mole. There are 18.01528 grams of water per mole of water. in 1g water

Explanation:

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6 0

2 years ago

In ionic bonding an arrow is often drawn on the diagram. What does

alexandr1967 [171]

In ionic bonding, an arrow is often drawn on the diagram to show the direction the electrons move to form the ions.

4 0

2 years ago

A student has a solution with a pH of 7. The student adds HF, hydrogen floride, to the solution, hoping to increases the pH of t

Allushta [10]

Low pH = high acidity.
HF has a very low pH, so when added to a solution, it will lower the pH of the solution and therefore make it more acidic. So the answer should be B.

5 0

2 years ago