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Ierofanga [76]
3 years ago
10

Is burning a physical or chemical property?

Chemistry
2 answers:
Marta_Voda [28]3 years ago
3 0
It is physical as you're not changing the chemical properties you're just changing the state
Maksim231197 [3]3 years ago
3 0
Burning is a chemical process by which a fuel is oxidised.

Take for example the burning of methane (CH4):
CH4 + 2O2 --> CO2 + 2H2O

As you can see the methane reacts with the oxygen to produce carbon dioxide and water, releasing heat in the process. The technical name is combustion.
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What is the fuel used in a fuel-cell automobile
Katena32 [7]
Hydrogen gas

Explanation

6 0
3 years ago
How many photons are produced in a laser pulse of 0.897 J at 407 nm?
Leona [35]
The relationship between energy of a single photon and its wavelength can be determined using the formula E=hc/lambda where E is energy, h is Planck's constant, c is the speed of light, and lambda is photons.

Before being able to solve for energy, need to convert nanometers to meters.

407 nm (1 m/1 x 10^9 nm) = 4.07 x 10^-7 m

Then plug in the values we know into the equation.
E h(Planck's constant) c(speed of light)
E = (6.63 x 10^-34 Js)(3 x 10^8 m/s) / 4.07 x 10^-7 m (lambda)

E=(0.000000000000000000000000000000000663js)(300,000,000m/s)=1.989×10^-25j/ms

E=1.989x10^-25j/ms /{divided by} 4.07x10^-7m = 4.8869779x10^-33 J (the meters cancel out)

E = 4.89 x 10^-33 J

This gives us the energy in Joules of a single photon. Now, we can find the number of photons in 0.897 J

0.897J / 4.89 x 10^-33 J = ((0.897 J) / 4.89) x ((10^(-33)) J) = 1.8343558 x 10^-34

1.83435583 × 10-34m4 kg2 / s4 photons
4 0
4 years ago
The cubic centimeter, which is often abbreviated as cc or cm3, is a metric unit for
serg [7]

Answer:

Volume

Explanation:

Cubic centimeters are used to measure the space an object takes up, or its volume.

7 0
3 years ago
Read 2 more answers
Complete the chemical equation related to the formation of sodium chloride​
son4ous [18]

Answer:

sodium + chlorine --> sodium chloride

3 0
3 years ago
Evaluate - if you put a scale in an elevator and weigh yourself as you ascend and the descend, does the scale have the same read
N76 [4]
No, when ascending, you would weigh more, and when you descend, you weigh less.

This is due to the difference in the effect of gravity.
4 0
3 years ago
Read 2 more answers
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