Answer:
CO2
Explanation:
it's the simplest whole number ratio of atoms of each element in the compound.
According to the given requirements, w<span>hen you crush a first-aid pack for an injured athlete and the pack gets cold, </span> A chemical change has occurred, with energy being absorbed is the true statement.
Just simply... they both are energy.
Use a bow and arrow as an example:
When you pull back an arrow, potential energy or PE is stored in the string and the limbs of the bow.
When you release the the arrow, energy is being transferred from the bow to the arrow. The arrow now has kinetic energy or KE, this means that the energy is being used by the arrow.
Answer:
Light pollution is excessive, misdirected or inappropriate outdoor lighting. Too much light pollution washes out the view of the Universe, increasing energy consumption, interferes with astronomical research, disrupts ecosystems, and affects the health and safety of humans and wildlife.
Explanation:
Light pollution radically alters their nighttime environment by turning night into day. ... “Predators use light to hunt, and prey species use darkness as cover,” Kyba explains “Near cities, cloudy skies are now hundreds, or even thousands of times brighter than they were 200 years ago.
Answer: Activation energy = 10 kJ
enthalpy change = -25 kJ
Explanation:
Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and
for the reaction comes out to be negative.
Given : Potential energy of the reactants = 30 kJ
Potential energy of the products = 5 kJ
Maximum energy of the system = 40 kJ.
Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.
Activation energy = Maximum energy of the system - Potential energy of the reactants = (40-30) kJ =10 kJ
Enthalpy change = Potential energy of the products - Potential energy of the reactants =(5-30) kJ= -25 kJ