Covalent bonds are formed when 2 neutral atoms come together to share a pair of electrons, where each atom contributes one electron each to be shared.
The covalent bond is kept together by the electrostatic attraction between the nuclei of the atoms and the shared pair of electrons.
Covalent bonds are usually formed between non metals with a small difference in their electro negativity.
the correct answer is
A. Neutral atoms coming together to share electrons
Answer:
The mass of water to be added is 2 pounds
Explanation:
The given parameters are;
The mass of the given solution = 2 pounds
The concentration of the given solution = 30%
The desired concentration of the solution = 15%
The mass, m of the acetic acid in the given solution = 30% × 2 pounds
m = 30/100 × 2 pounds = 0.6 pounds
To make a 15% acetic acid solution of acetic acid, the mass X of the required volume, is given as follows;
15% of X = 0.6 pounds
15/100 × X = 3/20 × 0.6 pounds
∴ The mass of the solution required X = 0.6 × 20/3 = 4 pounds
The mass of the solution that will contain 0.6 pounds of acetic acid giving a 15% acetic acid solution is 4 pounds
Therefore, the mass of water to be added to the original solution to make the a 15% acetic acid solution is 2 pounds.
Answer:
(a) = $34.123
(b) = $8.532
(c) Additional cost of fluorescent bulb is justified
Explanation:
Cost of electricity = $0.17 per kW·h
(a) For a 100 watt bulb which is the same as 100/1000 or 0.1 kW, the cost per hour =
0.1 × 0.17 = $0.017/h
and for 5.5 hours = 0.017×5.5 = $0.0935
The annual cost, which is 365 days, we have
Annual cost = $0.0935 × 365 = $34.123
(b) For the energy efficient 25-watt bulb, we have
25/1000 = 0.025kW
Power cost per annum =
0.025kW×$0.17 per kW·h×5.5×365 = $8.532
(c) Total cost of incandescent bulb = $0.89 total cost of using the incandescent bulb is $34.123 + $0.89 = $35.02
Total cost of using the energy efficient fluorescent bulb is about $3.49
Total cost of using the energy efficient bulb = $8.532 + $3.49 = $12.02
Total cost of incandescent bulb = $35.02 while total cost of energy efficient bulb is = $12.02
$12.02 <$35.02
Additional cost of fluorescent bulb is justified
Answer:
<h3>A-5N B-6N C-7N D-8N</h3>
Explanation:
i hope it helps ;)
B.Elements
Explanation: they cannot be separated
