Which of the following statements is true about a chemical equation?
e. In chemical reactions, matter is neither created nor destroyed so a chemical equation must have the same number of atoms on both sides of the equation. This phenomenon is referred as Law of conservation of mass. Therefore, the given statement is true.
What is always true during a chemical reaction?
During any chemical reaction, the mass of the products is always equal to the mass of the reactants. Two of the products of burning wood— carbon dioxide gas and water vapor— are released into the air. considered, the amount of matter is unchanged. mass of the reactants equals the total mass of the products.
What represents what happens during a chemical reaction?
Reactants are converted to products, and the process is symbolized by a chemical equation. For example, iron (Fe) and sulfur (S) combine to form iron sulfide (FeS). Fe(s) + S(s) → FeS(s) The plus sign indicates that iron reacts with sulfur.
Which of the following does not take place during a chemical reaction?
Refrences. 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. Atoms rearrange themselves during a chemical reaction.
What happens in a chemical reaction quizlet?
In chemical reactions, atoms rearrange to form one or more different substances. In a chemical change, the properties that give a substance its identity change. Chemical equations show that in chemical reactions, atoms rearrange, but no atoms are lost or gained.
Which of the following are correct about the chemical equation?
C. A chemical equation tells us about the atoms or molecules of the reactants and products involved in a reaction. D. All are correct.
What is a chemical reaction quizlet?
chemical reaction. A process in which one or more substances (reactants) are changed into one or more other substances (products). the law of conservation of mass. In a chemical reaction, the starting mass of the reactants equals the final mass of all products. Matter is neither created nor destroyed.
What are three facts about chemical reactions?
Quick Facts: –
- Some chemical reactions produce energy while rest of them absorb energy. …
- When iron reacts with oxygen in the presence of water or air, rust appears as a result.
- The mass of participants remains unaffected in a chemical reaction.
- Chemical reactions can happen in everyday's world.
What must happen for a chemical reaction to take place?
Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the 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 3 things must happen for a chemical reaction to occur?
Three things must happen for a reaction to occur.
- Molecules must collide.
- Molecules must collide with enough energy to begin to break the old bonds so new bonds can form. ( Remember activation energy)
- Molecules must collide with the correct orientation.
What three things can happen in a chemical reaction?
Chemical Reactions
- Old bonds are broken.
- Atoms are rearranged.
- New bonds are formed.
Which of the following is chemical process?
Solution : Distillation , crystallisation and sublimation all are the method of purification but the production of iodine from sea-weeds is a chemical process.
What occurs during a chemical reaction Brainpop answers?
what occurs during chemical reactions? atoms of two or more elements bond together. what can you conclude about the most common chemical compound on earth?
Which of the following happens during a chemical change?
In a chemical change, the atoms in the reactants rearrange themselves and bond together differently to form one or more new products with different characteristics than the reactants. When a new substance is formed, the change is called a chemical change.
What must happen for a chemical reaction to occur?
Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.
How do chemical reactions occur?
Reactions occur when two or more molecules interact and the molecules change. Bonds between atoms are broken and created to form new molecules. That's it.
What must happen for a chemical reaction?
Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.
Which of the following is the chemical reaction?
The correct answer is Burning coal in air. Chemical Changes (Chemical Reactions): Chemical reactions are the combination of different substances to transform into a new one.
Why do chemical reactions happen?
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 occurs during a chemical reaction quizlet?
In chemical reactions, atoms rearrange to form one or more different substances. In a chemical change, the properties that give a substance its identity change. Chemical equations show that in chemical reactions, atoms rearrange, but no atoms are lost or gained.
Which of the following is an example of a physical change Brainpop quizlet?
Which of the following is an example of a physical change? Water freezing into ice.
Which of the following must happen for a chemical reaction to occur?
What must happen with the reactants in order for a chemical reaction to occur? The particles must come in contact with each other and bond.
What is true chemical change?
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.
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 occurs in a chemical reaction?
Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.
How do the products of chemical reactions compare to their reactants Brainpop?
How do the products of chemical reactions compare to their reactants? The products usually weigh more than the reactants.
What must occur for a chemical reaction to happen quizlet?
What must happen with the reactants in order for a chemical reaction to occur? The particles must come in contact with each other and bond.
Which is not a true statement 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 causes a chemical reaction?
Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.