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N76 [4]
3 years ago
9

Can someone help me with this please

Chemistry
2 answers:
dusya [7]3 years ago
6 0
Boiling water: It starts bubbling and it becomes hot
Baking Cake: The cake becomes soft and not liquid
Burning Wood: The wood burns and turns into ash
Painting Door: The color changes and the wood numbs slightly

Hope this helps!
STSN
GuDViN [60]3 years ago
4 0
Boiling water- bubbles, steam , temperature is hot/// Physical
Baking a cake- smell is changing, getting bigger in size/// Chemical
Burning wood- Change of color, fire, hot , smell is changing///Chemical
Painting a door- color is changing, Smell is changing/// Physical
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Which of the following coefficients are needed to balance the combustion reaction of ethanol?
djyliett [7]
Answer is: d. 3,2,3.

Balanced chemical reaction: CH₃CH₂OH + 3O₂ → 2CO₂ + 3H₂O.
CH₃CH₂OH is ethanol.
O₂ is molecule of oxygen.
CO₂ is carbon(IV) oxide.
H₂O is water.
There are same number of atoms (oxygen, carbon and hydrogen) on both side of balanced chemical reaction:
2 atoms of carbon.
6 atoms of hydrogen.
7 atoms of oxygen.



5 0
3 years ago
A 16.0 g sample of methane gas, CH4, the gas used in a chemistry lab, has a volume of 5.0 L at 27ºC. Calculate the pressure.
NeX [460]

Answer:

4.9 atm

Explanation:

convert 16.0g of CH4 to moles

16.0 g CH4 x 1 mol CH4/16.0 g CH4 = 1.00 mol of methane

convert the temp into Kelvins: 27 + 273 = 300.K

PV = nRT

(P) (5.0 L) = (1.00 mol) (0.0821 L atm/mol K) (300.K)

P = 4.9 atm

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2 years ago
How does the energy of an electron change when the electron moves closer to the nucleus?
makkiz [27]
The energy of the electron reduces as it moves closers to the nucleus. This is because it moves from a higher energy orbital to a one of lower energy. It does this by releasing a photon with the energy difference of the current energy level, and the energy level it drops too.
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3 years ago
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What kind of chemical bond is found between paired bases of the dna double helix?
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How to convert 175Lbs to kg
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Note that 1 kg = 2.2 lbs
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