What is true about all chemical reactions?
In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
Which of the following is true about the chemical equation?
Answer: Option (C) (The number of atoms for a particular element is equal on both sides of the equation) is the correct option for this question. Explanation: In any balanced chemical equation the number of atoms for a particular element is equal on both sides of the equation is Balanced chemical equation.
Which of the following is true about chemical changes?
All chemical changes release chemical energy. All chemical changes result in the formation of a new substance.
Which of the following describes a chemical reaction?
A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products.
Which of the following are common features of chemical reactions?
The characteristics of a chemical reaction are :
- Evolution of gas.
- Formation of a precipitate.
- Change in color.
- Change in temperature.
- Change in state.
- Formation of new substances.
What always happens in a chemical reaction?
Chemical reactions involve breaking chemical bonds between reactant molecules (particles) and forming new bonds between atoms in product particles (molecules). The number of atoms before and after the chemical change is the same but the number of molecules will change.
Which of the following may not be followed by a chemical reaction?
Melting of candle wax on heating is an example of physical change no chemical reaction is taking place only the change of state from solid to liquid state.
Which is not true statement for a chemical change?
Swallowing a small glass ball is a chemical change. Swallowing a small glass ball is not a chemical change and thus the statement in the question saying it is a chemical change is false, that is, not true. As the glass ball being swallowed, it is not showing any change in its composition.
Which is not true for a chemical change?
False – During a chemical change, the composition of the original substance is altered and the change is irreversible. False – Melting of butter and wax are examples of chemical changes. False – Melting of ice is an endothermic, reversible physical change.
What are the characteristics of chemical reactions?
The characteristics of a chemical reaction are :
- Evolution of gas.
- Formation of a precipitate.
- Change in color.
- Change in temperature.
- Change in state.
- Formation of new substances.
Which of the following conditions is necessary for a chemical reaction?
A chemical reaction must follow the law of conservation of mass.
What always happens in a chemical reaction quizlet?
Terms in this set (20) What always happens during a chemical change? During a chemical change, the composition of matter always changes.
Which of the following is not true about the characteristics of a chemical reaction?
Explanation: BECAUSE AFTER CHEMICAL CHANGE OBJECT DOES NOT COME IN ITS ORIGINAL STATE THEREFORE REVERSIBILITY IS NOT CHARACTERISTIC OF CHEMICAL CHANGE .
Which of the following is not evidence of chemical reaction?
Answer and Explanation: The correct option is (d.) a change in appearance only.
Which of the following may not be occurs during a chemical reaction?
Correct answer: (c) Atoms of one element change into those of another element to form new products. Explanation: It is not atoms but bonds between the atoms break and form during a chemical reaction.
What is part of all chemical reactions?
According to the modern view of chemical reactions, bonds between atoms in the reactants must be broken, and the atoms or pieces of molecules are reassembled into products by forming new bonds. Energy is absorbed to break bonds, and energy is evolved as bonds are made.
What are the characteristics of chemical reaction?
The characteristics of a chemical reaction are :
- Evolution of gas.
- Formation of a precipitate.
- Change in color.
- Change in temperature.
- Change in state.
- Formation of new substances.
Which of the following must be true for a chemical change to have occurred?
What must occur for a change to be a chemical reaction? There must be a change in chemical properties.
Which of the following best describes chemical reaction?
A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products.
Which of the following is the evidence of a chemical reaction?
The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.
Which of the following is not a characteristic of a chemical reaction?
Explanation: BECAUSE AFTER CHEMICAL CHANGE OBJECT DOES NOT COME IN ITS ORIGINAL STATE THEREFORE REVERSIBILITY IS NOT CHARACTERISTIC OF CHEMICAL CHANGE .
Which of the following happens during a chemical reaction?
chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
What are the characteristics of a chemical reaction?
The characteristics of a chemical reaction are :
- Evolution of gas.
- Formation of a precipitate.
- Change in color.
- Change in temperature.
- Change in state.
- Formation of new substances.
What changes must occur in all chemical reactions?
According to the modern view of chemical reactions, bonds between atoms in the reactants must be broken, and the atoms or pieces of molecules are reassembled into products by forming new bonds. Energy is absorbed to break bonds, and energy is evolved as bonds are made.
Which of the following is the result of a chemical reaction?
products The substances formed as a result of a chemical reaction are called products.
Which of the following is evidence for a chemical reaction quizlet?
What are the five types of evidence you can use to determine if a chemical reaction has occurred? Change in color, formation of a precipitate, production of gas bubbles (effervescence), change in texture or other observable properties (formation of new substance), and changes in energy (endothermic vs exothermic).
What occurs in a chemical reaction?
Chemical reactions involve breaking chemical bonds between reactant molecules (particles) and forming new bonds between atoms in product particles (molecules). The number of atoms before and after the chemical change is the same but the number of molecules will change.
What are the properties of a chemical reaction?
Chemical Reaction Characteristics
- Irregular Change in Color. …
- Change in Consistency. …
- Change in Luster. …
- Appearance of Bubbles. …
- Changes in Odor. …
- Change in Temperature. …
- Precipitate Formation. …
- Combination Reaction/Synthesis Reaction.
What are the main characteristics of a chemical reaction?
The characteristics of a chemical reaction are :
- Evolution of gas.
- Formation of a precipitate.
- Change in color.
- Change in temperature.
- Change in state.
- Formation of new substances.
What happens in all chemical changes?
The chemical reaction produces a new substance with new and different physical and chemical properties. Matter is never destroyed or created in chemical reactions. The particles of one substance are rearranged to form a new substance. The same number of particles that exist before the reaction exist after the reaction.