Which of the following is balanced chemical equation?
A balanced chemical equation occurs when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side. In this chemical reaction, nitrogen (N2) reacts with hydrogen (H) to produce ammonia (NH3). The reactants are nitrogen and hydrogen, and the product is ammonia.
Which statement is true about chemical reactions?
Which of the following statements is true about what happens during a chemical reaction? Bonds of the reactants are broken, and bonds of the products are formed. products is greater that the chemical energy of the reactant.
Which of the following does not state what the arrow means in a chemical equation?
|Which of the following does NOT state what the arrow means in a chemical equation? A. forms B. Products C. Conserves D. Yields||C. Conserves|
|The coefficients in a balanced chemical equation always can express the ratio of:||Balanced reactants and products|
Which of the following happens during a chemical reaction?
A chemical reaction is a process in which some substances, called reactants, change into different substances, called products. During the reaction, chemical bonds break in the reactants and new chemical bonds form in the products.
How do you balance chemical equations examples?
Examples of Balancing Chemical EquationsExample 1. C5H12 + O2 —> CO2 + H2O. Example 2. Zn + HCl —> ZnCl2 + H2 Example 3. Ca(OH)2 + H3PO4 —> Ca3(PO4)2 + H2O. Example 4. FeCl3 + NH4OH —> Fe(OH)3 + NH4Cl. Example 5. S8 + F2 —> SF6 Example 6. C2H6 + O2 —> CO2 + H2O. Example 7. Al2(CO3)3 + H3PO4 —> AlPO4 + CO2 + H2O.
Is Melting ice a chemical reaction?
When you melt an ice cube (H2O), you have a physical change because you add energy. You added enough energy to create a phase change from solid to liquid. Physical actions, such as changing temperature or pressure, can cause physical changes. No chemical changes took place when you melted the ice.
Is digesting food a chemical change?
Chemical Reactions take place in our body too. For example, the whole digestion process involves chemical reaction of acids and the food. During digestion, the food is broken down in to smaller molecules. The salivary glands in our mouth release digestive enzymes which help in the breakdown of food.
Is freezing water a chemical reaction?
are really chemical in nature. In the process of freezing to ice, the molecules in liquid water start in one configuration, form bonds as they take on the new configuration, and release energy in the process.
What are the substances present before a chemical reaction?
A chemical reaction is the process in which atoms present in the starting substances rearrange to give new chemical combinations present in the substances formed by the reaction. These starting substances of a chemical reaction are called the reactants, and the new substances that result are called the products.
What are the characteristics of a synthesis reaction?
A synthesis reaction occurs when two or more reactants combine to form a single product. This type of reaction is represented by the general equation: A + B → AB. An example of a synthesis reaction is the combination of sodium (Na) and chlorine (Cl) to produce sodium chloride (NaCl).
What is the best way to be certain that a chemical reaction has occurred?
The only way to be certain that a chemical reaction has taken place is to test the composition of the substances after the change has taken place to see if they are different from the starting substances.
What is chemical reaction explain with an example?
A chemical reaction happens when one or more chemicals are changed into one or more other chemicals. Examples: iron and oxygen combining to make rust. vinegar and baking soda combining to make sodium acetate, carbon dioxide and water. many reactions that happen inside living things.
What does chemical change mean?
a usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance: The formation of rust on iron is a chemical change.