Answer:
You can see that it is an endothermic reaction or heat is being absorbed for the change from magnesium to magnesium oxide. So it is an endothermic reaction. So these are the four reasons why we can say that burning of magnesium ribbon in the air is considered a chemical change.
Explanation:
hope it help
Answer:
Explanation:
According to the ideal gas law equation:
Let's express the number of moles in terms of mass and molar mass:
Let's divide both sides by volume:
Notice that:
So the equation becomes:
Expressing density:
Substituting the given values:
a.
A substance's specific heat tells you how much heat is required to increase the temperature of 1 g of that substance by 1°C.
The equation that establishes a relationshop between heat and change in temperature is
q = m • c • ∆T, where
q - heat absorbed
c - the specific heat of the substance, in your case of water
ΔT - the change in temperature, defined as the difference between the final temperature and the initial temperature
so:
q = 1.00 g • 4.18 J/g×°C • (75.0 - 38.5)°C
q = 152,57 J
just apply this formula for all exercises
The answer would be color. The temperature affects the brightness and the shade of the star.
Answer:
D
Explanation:
Isotopes are identified by their mass, which is the total number of protons and neutrons.
