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Fofino [41]
4 years ago
5

Which pair of properties describes the elements in Group 18?

Chemistry
1 answer:
olga55 [171]4 years ago
6 0

Answer

-12

Explanation:

Cs 22 is not close to -12

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Negatively charged particles in the outermost<br> energy level of the electron cloud.
balandron [24]

Answer:

Electrons are negatively charged particles that surround the atom's nucleus. Electrons were discovered by J. J. Thomson in 1897. *Protons are positively charged particles found within atomic nuclei.

Explanation:

6 0
3 years ago
The density of pure copper is 8.96 at 20°C. If 5.00 g of pure copper pellets is added to a graduated cylinder containing 14.6 mL
Triss [41]

Answer:

15.2 mL

Explanation:

First we calculate the volume of the copper

volume = \frac{mass}{density}= \frac{5.00 g}{8.96 g/mL} = 0.5580 mL\\

when this volume of copper is added to the water, the water level will rise by the level of the volume of copper. So the final volume is:

14.6 mL + 0.5580 mL = 15.158 mL

Since the measuring cylinder is graduated to one decimal place , we can round this up to 15.2 mL

8 0
3 years ago
Which carboxylic acid can be combined with an alcohol to form the ester shown below?
Anna11 [10]

Answer:

CH₃CH₂CH₂COOH.

Explanation:

To know which option is correct, let us hydrolysed the given ester. This is illustrated in the attached photo.

Hydrolysis of ester involves breaking the ester bond by a water molecule to produce the corresponding alcohol and carboxylic acid.

From the reaction given in the attached photo, we can see that the carboxylic acid needed to produce the desired ester is butanoic acid, CH₃CH₂CH₂COOH.

7 0
4 years ago
Hi please help me i only have 2 days to do all of this
Naily [24]
None of them really sound like the answer, but my best guess would probably be the second one. It doesnt give much info.


7 0
3 years ago
Read 2 more answers
If a sample of nitrogen gas (N2) contains 1.2 x 10^24 atoms of nitrogen, then about how many moles of nitrogen gas are in the sa
OLga [1]

The number of moles of nitrogen gas is  1.0 mole


<u><em>calculation</em></u>

N2 is a molecule  therefore;

1  molecule  of N₂  = 2 atoms  of N

          ? molecules= 1.2 x10 ²⁴atoms

<em>by cross  multiplication</em>

=[( 1.2  x 10²⁴ atoms x 1  molecule) / 2 atoms]  = 6 x 10²³  molecules


According to Avogadro's  law  1  mole  =6.02 x 10²³  molecules

                                                                ?  moles= 6.0 x 10²³   molecules

<em>by cross  multiplication</em>


= [(6.0x 10²³  molecules  x 1  mole) / 6.02 x10²³  molecules]  =  1.0  mole


4 0
3 years ago
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