Answer:
-The reactants have less heat energy than the products.
Explanation;
-An endothermic reaction is a reaction in which heat energy is absorbed from the surroundings. In such a reaction the energy of the reactants is less than the energy of the products and therefore the enthalpy change is positive, greater than zero.
The answer is Energy is absorbed making it feel colder. Endothermic reactions absorb heat from their environment (hence lowering the temperature of the nearby environment), unlike ectothermic reactions that release energy to their environment . The enthalpy of products in an endothermic reaction is higher than that of the reactant hence the change in enthalpy is positive.
b.)the pressure will decrease c.) the pressure will increase d.) the density will decrease
The pressure will increase. The correct option is (C).
The most reasonable change in property to expect when the volume of the gas is reduced is the pressure will increase.
This relationship between pressure and volume is described by Boyle's law, which states that when the volume of a gas decreases at constant temperature, the pressure of the gas increases.
This is because reducing the volume of the chamber decreases the space available for the gas particles to move, leading to more frequent collisions with the walls and an increase in pressure.
Therefore, as the volume of the gas is reduced in the chamber, the pressure will increase.
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Answer:b
Explanation:
if your doing it on stemscopes
(2) different physical properties and the same chemical properties
(3) the same physical properties and different chemical properties
(4) the same physical properties and the same chemical properties
(2) NaOH (4) CH3COOH
Igneous rocks that cools very quickly when it forms may have a texture that is smooth and shiny with no visible grains.
Igneous rocks also called as magmatic rocks is one of the three main rock type present the other two being sedimentary and metamorphic rocks.These rocks are formed by cooling and solidification of magma or lava .
The magma is derived from from partial melts of rocks which are existing in the earth's crust or mantle.Melting is caused by one of the three processes increase in temperature, change in composition or decrease in pressure.
Igneous rocks are classified based according o their occurrence, texture, chemical composition or mineral content.According to their mode of occurrence they are classified as intrusive or extrusive igneous rocks.
Learn more about igneous rocks,here:
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A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.
For example, if a piece of paper is cut up into small pieces it still is paper. This would be a physical change in the shape and size of the paper. If the same piece of paper is burned, it is broken up into different substances that are not paper.
When heat is given off in a chemical change or reaction, it is called an exothermic reaction. When heat is absorbed in a chemical change or reaction, it is called an endothermic reaction. The speed at which chemical reactions take place depend on the temperature pressure and how concentrated the substances involved in the chemical reaction are. Sometimes substances called catalysts are used to speed up or help along a chemical reaction. Light is helpful in the processing of film.