Please help me with chemistry questions????

Posted on 2014-11-27 07:38:00 in Chemistry by EDRO

Multiple choice

1. A (single, double, triple,) covalent bond results when two pairs of electrons are shared between atoms of the molecular compound

2. two or more substances combine to form one substance in a (composition, single replacement, double replacement, decomposition) chemical reaction

3. during a chemical reaction (elements are produced, atoms are destroyed, atoms are rearranged, elements are destroyed)

4. an equation is balanced by (adding subscripts, adding coefficients, adding superscripts)

5. when the equation Al + Br2 ------ Al Br3 is balanced, the coefficient for Al is (1,2,3,4)

6. there are (2,4,6,8) fundamental types of chemical reactions

Completion

1. Bond _ _ is the energy needed to break a covalent bond

2. a covalent bond is made by _ one or more pair/s of electrons between atoms.

3. to satisfy the octet rule, atoms form single, _ or _ of the new molecule.

4. A group of atoms united by covalent bond/s is called a _ compound

5. polar bonds means an unequal aspect of the _ or _ of the new molecule.

6. the substances formed i the chemical reaction are called _

7. ___ are written in front of chemical formulas to balance the equation

8. chemical __ are the scientific way of representing chemical reactions

9. a synthesis reaction is represented like this _____

10. a double replacement reaction is represented like this __

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