Multiple Choice. Read the statements carefully and answer the following questions. 1. A chemical reaction is a process in which a. All reactants change state b. Products change into reactants c. the of conservation of mass is applies d. all of these 2. During a chemical reaction, a. Atoms are destroyed b. Atoms are rearranged c. elements are destroyed d. new elements are produced 3. The following are evidences of chemical reactions except a. Evolution of gas b. Formation of percipitate c. production of gas
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Multiple Choice. Read the statements carefully and answer the following questions.
1. A chemical reaction is a process in which
a. All reactants change state
b. Products change into reactants
c. the of conservation of mass is applies
d. all of these
2. During a chemical reaction,
a. Atoms are destroyed
b. Atoms are rearranged
c. elements are destroyed
d. new elements are produced
3. The following are evidences of
a. Evolution of gas
b. Formation of percipitate
c. production of gas
d. change in temperature
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