Chapter 6 and 7 study guide

For A neutral atom of an element, the number of _____ is always the same

• Ions and electrons
• protons and electrons
• neutrons and protons
• atoms and molecules

Melting ice is an example of a(n) ________. 

• chemical change
• endothermic reaction 
• exothermic reaction
• physical change

A sodium atom that losses an electron is written as?

• Na-
• Na+
• S+
• Na2

Removing electrons that are closer to the nucleus takes _______ than removing electrons that are farther away from the nucleus.

• More energy
• An equal amount of energy
• less energy
• more time

When two or more atoms share electrons unevenly they are held together by a(n)_____ bond

• Neutral
• Polar
• ionic
• nonpolar

Catalysts _________ the activation energy needed to start a chemical reaction

• inhibit
• increase
• reduce
• balance

To check that an equation is balanced, count the number of ________ on each side of the equation

• ions
• molecules
• atoms of each type
• types of elements

When a positively charged ion and a negatively charged ion are attracted to each other, the fond they form is _________ bond

• ionic
• covalent
• atomic
• shared

A(n) __________ is a combination of chemical symbols and numbers that tell which elements are present in a molecule and how many atoms of each element are present.

• Formula
• electron dot diagram
• periodic table
• elemental chart

Adding an inhibitor tends to _________ a reaction?

• Speed up
• Reverse
• Stop
• slow down