Answer:
A chemical reaction is a process in which one or more substances (reactants) are transformed into one or more different substances (products). During a chemical reaction, chemical bonds between atoms in the reactants are broken, and new bonds are formed to create the products. This transformation often involves the rearrangement of atoms and the exchange of energy.
Key characteristics of a chemical reaction include:
1. **Reactants:** These are the substances that undergo the chemical transformation. They are present before the reaction begins.
2. **Products:** These are the substances that result from the chemical reaction. They are formed as a result of the rearrangement of atoms from the reactants.
3. **Chemical Equations:** Chemical reactions are typically represented using chemical equations, which show the reactants on the left side and the products on the right side. For example, the reaction between hydrogen and oxygen to form water is represented as: 2H2 + O2 → 2H2O.
4. **Conservation of Mass:** In a closed system, the total mass of the reactants is equal to the total mass of the products, according to the law of conservation of mass.
5. **Energy Changes:** Chemical reactions may release or absorb energy. Reactions that release energy are exothermic, while those that absorb energy are endothermic.
Chemical reactions are fundamental to chemistry and play a crucial role in various natural and industrial processes. They are involved in everything from the digestion of food in our bodies to the combustion of fuel in engines, and they underlie the synthesis of a wide range of substances, from pharmaceuticals to materials used in everyday life. Understanding and controlling chemical reactions is essential in fields such as chemistry, biology, and engineering.
Answer:
a chemical reaction is a process in which two or more chemicals react with each other
In this reaction there is conservation of
(1) mass, only
(2) mass and charge, only
(3) charge and energy, only
(4) charge, energy, and mass
Answer: option (4) charge, energy, and mass.
Justification:
1) Charge, energy, and mass are always conserved in every chemical reaction.
Charge, energy and mass are not created nor destroyed, but can be transferred.
2) The charge can only be transferred by the motion of electrons, so the charge can move and end up on a different atom, but when you add up all the charge is conserved.
The charge balance is verified in the given equation since:
left side right side
(1+) + (1-) = 1 - 1 = 0 0
∴ The total charge of the reactants equals the total charge of the products.
3) As for energy, the right side shows the "apparition" of some energy. That means that the reaction is exothermic, i.e. it releases energy.
The energy released is the net result of the difference in the potencial chemical energy of the bonds of the products and the reactants.
The reactants have more chemical energy stored than the reactants, so potential energy was transformed into heat energy.
4) As for the mass, its conservation is verified when you check that there are the same number of particles of each spieces: two particles of hydrogen in the reactand side, such as in the products; and the particles of oxygen are one in the reactants and one in the products.
Answer:
The elements that will be present after the burning of Ethanol are;
(i) Carbon
(ii) Oxygen
(iii) Hydrogen
Explanation:
The balanced chemical equation for the burning of ethanol is as follow;
C₂H₅OH + 3 O₂ → 2 CO₂ + 3 H₂O
It can be observed in given balanced chemical equation that there three elements involved in this entire reaction. The elements that present in the reactant side are also found on the product side. It means that the elements have just rearranged going from reactant to product.
This means that this reaction is obeying Law of Conservation of Mass which states that mass can neither be created nor destroyed but it can be changed from one form to another hence, to keep the mass on both sides of the reaction balanced the same elements should be present on the product side too.
Answer: carbon, hydrogen, and oxygen only
Explanation: When a chemical reaction occurs, the atoms in the original set of substances are rearranged to form a new set of substances. The number of atoms of each element does not change.
The elements carbon, hydrogen, and oxygen are the only elements present in the original substances, so the only elements in the final substances after the reaction will be carbon, hydrogen, and oxygen, as well. The number of atoms of each element must be the same before and after the reaction.
A mixture of sand and table salt can be separated by filtration because the substances in the mixture differ in solubility in water. Thus, the correct option for this question is D.
Solubility may be defined as the phenomenon in chemistry that involves the maximum amount of a substance that will significantly be disbanded in a given amount of solvent at a particular temperature.
The answer to the above question is better understood by the fact that when you mix both salt and sand in the water, you may find that salt is completely soluble in water while sand is not. This is because the bond of water is not competent enough to dissolve the sand.
Therefore, the correct option for this question is D.
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Use Newton’s Law to explain why a bowling ball will slow down and stop when rolled in a flat surface, like a street.
Answer:
Force is must to change the velocity of an object. Force is always equal to the mass of the object times its acceleration.
Explanation:
From the second law of Newton, it states that the force is the product of mass of an object and its acceleration. Here, when the bowling ball is rolling across a flat surface, frictional force acts on it which oppose the motion of the ball and causes deceleration of the ball. This is an example of rolling friction. Acceleration of the bowling ball depends directly to the force of friction and indirectly to its mass.
B. atomic number.
C. molecular mass.
D. molecular size.
It is dense.
B.
It has a melting point.
C.
It is hard to bend.
D.
It becomes rusted.
the answer is d.it becomes rusted