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3 years ago

6

If calcium has two valence electrons and fluorine has seven, how many fluorine atoms are needed to form an ionic bond with calci

um

2 answers:

Brut [27]3 years ago

8 0

There are 7 i just took the test

MaRussiya [10]3 years ago

5 0

Fluorine needs one electron to fill its orbital shell. It needs 8 valence electrons

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11. Which of the following is a characteristic of all chemical changes? *

Shtirlitz [24]

Answer:

Explanation:

A new Material is formed.

Basically, Chemical changes differ from Physical changes because in chemical changes, Substances have the ability to become a different substance.

Example:

Water to ice is a physical change because it is still water despite being a solid from liquid.

A Magnesium strip placed in CuSO4 solution made the Mg strip turn into a new substance which is MgSO4. this is a Chemical change because Mg has now become a different substance called MgSO4.

4 0

3 years ago

the combustion of a sample of butane C4H10 (lighter fluid ),produced 2.16 grams of water. 2C4H10 +13O2 ------->8CO2+10H2O how

ratelena [41]

I think this is learned in chemistry do you have any notes that can help

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3 years ago

Relating ideas explain why ionic crystals melt at much higher temperatures than typical covalent molecular crystals.

gayaneshka [121]

Because of the way the temp is set up

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3 years ago

Sn=0.14 (E) <br>Sn+2 = -0.15(E) <br>Which form of tin is the stronger reducing agent? OS O Sn +2?

fomenos

0.14

Explanation:

I just needed to finish setting up my account

3 0

2 years ago

2. A sample of apple juice has a volume of 4 mL and a mass of 72 g. What is the density

tangare [24]

Mass=72g
Volume=4mL

$\\ \sf\longmapsto Density=\dfrac{Mass}{Volume}$

$\\ \sf\longmapsto Density=\dfrac{72}{4}$

$\\ \sf\longmapsto Density=18g/mL$

5 0

3 years ago