Atoms
Compounds
Chemistry
Acids and Bases
Miscellaneous
100

What is an atom?

the smallest piece of an element

100

What are molecules?

the simplest unit of a chemical substance, usually a group of two or more atoms

100

What is involved in chemistry?

the study of matter--what it is made of, what its usual characteristics are and how it reacts to other matter

100
How do acids taste?

Acids are sour.

100

Which ionic compound is produced from a reaction between an acid and a base?

salt

200

What is an element?

a substance; only one kind of atom

200

What do chemical formulas have?

chemical symbols and numbers to abbreviate the name of a compound

200

What do you call an atom that has gained or lost electrons (the number of electrons do NOT equal the number of protons)?

ion

200

How do bases taste and feel?

Bases are bitter and slippery. 

200

Which scientist developed a simplified model of an atom?

Niels Bohr

300

Which two parts make up the nucleus? What can you calculate when you add these two up?

protons and neutrons; atomic mass

300

What are compounds?

Compounds are a kind of molecule produced as a result of a chemical change or reaction. They are molecules that combine two or more different elements. 

300

What do you call when atoms share pairs of electrons? What happens due to their sharing of electrons?

covalent bonds; the electrons fill in more of the outer shells of both atoms

300

What are corrosive acids? What can they do?

They are highly acidic and dangerous acids that burn your skin. They can even dissolve metals. 

300

Which scientist came up with a way to organize and classify all of the elements (Periodic Table of the Elements)?

Dmitri Mendeleev

400

Which part of the atom travels around the nucleus? What is its charge? How much does it weigh?

electrons; negatively charged; so light that they contribute almost nothing to the mass of an atom

400

What happens when different types of atoms join together?

a chemical change or reaction

400

How do ionic bonds form?

when positively and negatively charged ions attract each other

400

What are some examples of acids? What are some examples of bases?

hydrochloric acid, gastric juices, lemon, vinegar, tomato juice, coffee, milk

baking soda, soap, bleach, toothpaste, antacid

400

What do periods show in a periodic table? What do groups show?

Periods show how many shells of electrons the element has.

Groups show how many electrons are in the element's outer shell; elements in the same group have similar physical and chemical properties.

500

Atoms share electrons in ______________________.

a covalent bond

500

How are molecules produced?

Some are produced when atoms of the same element combine. 

Others are produced when atoms of two or more different elements combine through a chemical change or reaction.

500

Explain what happens during synthesis reaction and decomposition reaction.

synthesis: when molecules combine to form new substances

decomposition: when a compound is broken down into simpler compounds

500

What do the two compounds (acids and bases) form when dissolved in water?

H+ (hydrogen ions) - acids

OH- (hydroxide ions) - bases

500

Which scale do we use to determine the concentration of an acid or a base in a solution? Explain the range for acids and the range for bases. 

the pH scale numbered from 0-14; acids measure from 0 to 6.9; bases measure from 7.1-14; solutions with a pH of 7.0 is neutral like pure water

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