Some examples from this set of practice questions
1.
what is the law of conservation of mass?
Answer: when a chemical reaction is performed, no matter is created or destroyed. the number and type of atoms must be balanced. If an equation is balanced, it obeys the law of conservation mass.
2.
what is a chemical equation?
Answer: a chemical equation or chemical reaction is what is represented so that it can agree with the law of conservation of mass.
3.
In Science, some molecules are not able to be alone when they are not part of a compound. What are they? they are called diatomic molecules.
Answer: I-iodine h-hydrogen n-nitrogen br-bromine o-oxygen cl-chlorine f-fluorine
4.
what is a physical change?
Answer: a physical change does not alter the characteristics or molecules of a substance. No new substance is formed
5.
how does the mole ratio help us?
Answer: it helps us convert between moles and mass. this is useful in questions because the calculations allow us to go from one form to another.
6.
how are both ionic and covalent bonds different?
Answer: 1. ionic bond: n.metal metal. 2. covalent bond: n.metal n.metal
7.
what is ENERGY? define.
Answer: energy is the ability to do work, effect change.
8.
chemical reactions can be classified into two main categories. what are they? how can they be differentiated?
Answer: 1. endothermic, releases less energy, absorbs more. also seen as absorbing the energy from its surroundings. temperature decrease. 2. exothermic, releases more energy than is absorbed. releases energy into its surroundings. temperature increase.
9.
nomenclature has two main types of bonds. what are they?
Answer: 1. ionic bond 2. covalent bond
10.
what phases can be identified to the elements on the periodic table?
Answer: l: liquid s: solid aq: aqueous g: gas
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