Answer:
Magnesium, Carbon and Oxygen.
Explanation:
(9.0*10^17 He molecules)* (1 mol He/ (6.02*10^23 He molecules))= 1.5*10^(-6) mol He.
1.5*10^(-6) mol He* (4.00 g He/ 1 mol He)= 6.0*10^(-6) g He.
The mass of 9.0*10^17 He molecules at STP is 6.0*10^(-6) g He~
The given blank can be filled with endothermic reactions.
The endothermic reactions or processes captivates energy from its surroundings, primarily, but will not always be in the form of heat. A reaction, which requires the input of energy that dissociates a bond will always be endothermic. The best examples of endothermic reactions are evaporation of the liquid, melting cubes, melting or solid salts, and others.
Answer: A chemical change results from a chemical reaction while a physical change is when matter changes forms. In other words, a chemical change produces a new substance, and a physical change does not. For example, a chemical change includes burning, cooking, rusting and rotting, among many others. An example of a physical change includes boiling, melting, freezing, and shredding. Usually, physical changes can be undone while chemical changes cannot. The only way to reverse a chemical change is by creating another chemical reaction.
Answer:
To summarize, potential energy is the energy that is stored in an object due to its position relative to some zero position. An object possesses gravitational potential energy if it is positioned at a height above (or below) the zero height.
Explanation:
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