When the new star reaches a certain size, a process called nuclear fusion ignites, generating the star's vast energy. The fusion process forces hydrogen atoms together, transforming them into heavier elements such as helium, carbon and oxygen.
Answer:
Its kinetic energy.
Explanation:
In a liquid, the molecules are so close together that there is very little empty space. A liquid also has a definite volume, because molecules in a liquid do not break away from the attractive forces. The molecules can, however, move past one another freely, and so a liquid can flow, can be poured, and assumes the shape of its container.
An increase in the temperature of a liquid causes an increase in the average speed of its molecules. As the temperature of a liquid increases, the molecules move faster thereby increasing the liquid's kinetic energy.
Answer:
Mass = 10440.9 g
Explanation:
Given data:
Number of atoms of Cu₂S = 3.95×10²⁵
Grams of Cu₂S = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen
Now we calculate the number of moles from given number of atoms.
3.95×10²⁵ atoms/ 6.022 × 10²³ atoms × 1 mol
0.656×10² mol
65.6 mol
Now we will calculate the mass:
Mass = number of moles × molar mass
Mass = 65.6 mol × 159.16 g/mol
Mass = 10440.9 g
The rate of a chemical reaction is defined as the change in the concentration of a reactant or a product over the change in time, and concentration is in moles per liter, or molar, and time is in seconds. So we express the rate of a chemical reaction in molar per second.
Answer:
c. Endothermic
Explanation:
endothermic reactions absorb heat, exothermic reactions release heat.