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9966 [12]
2 years ago
11

Do I know if a substance is ionic or molecular

Chemistry
2 answers:
MA_775_DIABLO [31]2 years ago
7 0
Not sure but if I were to guess I would say it is solid steel
alexgriva [62]2 years ago
7 0
Which of these elements has the smallest atomic radius
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A 10-Newton object displaces 12 Newtons of water. Will this object sink of float?
timurjin [86]
This object would float
6 0
3 years ago
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If you dilute 250 mL of 6.4 M lithium acetate solution to a volume of 750 mL, what will the concentration of this solution be?
Tresset [83]
The answer would be 1006.4
3 0
3 years ago
Replacing standard incandescent light bulbs with energy-efficient compact fluorescent lightbulbs can save a lot of energy. Calcu
EleoNora [17]

Answer:

a) 1512000 Joules

b) 5040 seconds = 84 minutes = 1.4 hours

Explanation:

Power saved y replacing bulbs = 60-18 = 42 W = 42 J/s

Time the bulb is used for = 10 hours

Energy saved during this time

42×10×60×60 = 1512000 Joules

Saved energy by replacing standard incandescent lightbulbs with energy-efficient compact fluorescent lightbulbs in 10 hours is 1512000 Joules

b) Power the plasma TV uses = 300 W = J/s

\frac{1512000}{300}=5040\ s3001512000=5040 s

Time a plasma TV can be used for with the saved energy is 5040 seconds = 84 minutes = 1.4 hours.

3 0
2 years ago
16 Which two gases can not be broken down by chemical means?(1) CO and He (3) Xe and He
lyudmila [28]
The answer is (2) CO and NH3. The chemical reaction can only break down chemical bonds between atoms inside the molecule. The He and Xe is consists of one atom only, so they can not be broken down by chemical means.
4 0
3 years ago
You break a pencil lead. Which statement is true?
aalyn [17]

Answer:

  • <em><u>A physical change has occurred, with no energy change.</u></em>

Explanation:

When a pencil lead is broken there is not change of any chemical properties, therefore it is not a chemical change, but just a physical change. In this case the change is just the number of pieces and dimensions.

Chemical changes always involve the formation of new different substances; the bonds between the atoms of the starting substances (reactants) breake and new bonds are formed leading to new substances (products) with different chemical composition (arrange of atoms). Chemical changes occur through chemical reactions.

Hence, if there is not change on the chemical composition, you think on physical changes. Physical changes include change in shape, size, state of matter (e.g. solid, liquid, gas). In the case of a pencil lead breaking, it is a change in shape and size.

Also, since energy has not been absorbed or released during the change, the energy of the pencil lead before having been broken is equal to the sum of the energies of the pieces of pencil lead obtained. So, this is a physical change with no energy changes.

Some examples of physical changes that include change in energy are the change of state (e.g. solid to liquid or liquid to gas) and the dissolution of a compound.

7 0
3 years ago
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