TEST
Circle the phrase which best answers each question.
1. Compounds are formed when atoms give up, gain or share:
• neutrons.
• protons.
• electrons.
• photons.
2. _____ occur when electrons are transferred from one atom to another.
• Ionic bonds
• Covalent bonds
• Noble gases
• Ions
3. Most noble gases are stable elements because their electrons form:
• hydrogen molecules.
• covalent bonds.
• ionic bonds.
• octets.
4. The pH scale measures the relative strength of acids or bases in:
• isolation.
• metals.
• solutions.
• hydrocarbons.
5. When atoms combine with the help of covalent bonds, _____ are formed.
• electrons.
• neutrons.
• protons.
• molecules.
6. Molecules are represented using a shorthand method called:
• oxidation numbers.
• polyatomic formulas.
• compound ions.
• chemical formulas.
7. The ability of an element to combine with other elements is represented by its:
• oxidation number.
• chemical formula.
• pH level.
• compound number.
8. _____ are formed when molecules share electrons.
• Metals
• Acids
• Hydrocarbons
• Polyatomic ions
9. Methane is an example of:
• a subatomic particle.
• a hydrocarbon.
• a covalent bond.
• an octet.
10. Nearly all of the elements with negative oxidation numbers are:
• metals.
• gases.
• organic chemicals.
• halogens.
REVERSE ALPHABET
An important word in each sentence below is written in Reverse Alphabet. Use the code below to
discover the important word in each sentence.
A= Z, B=Y, C=X, D=W, E=V, F=U, G=T, H=S, I=R, J=Q, K= P, L = O, M=N, N=M, O=L, P=K, Q=J,
R=I, S=H, T=G, U=F, V=E, W=D, X=C, Y=B, Z=A
1. The forces that hold atoms together in compounds are called XSVNRXZO bonds.
_________________________
2. Noble gases have very stable VOVXGILM configurations.
_________________________
3. The ZOPZORMV Earth Metals achieve a stable octet by losing one electron and gaining a
positive ion.
_________________________
4. Compounds formed by covalent bonding are often ORJFRWH or TZHVH at room
temperature.
_________________________
5. The combining ability of an element is described by its LCRWZGRLM number.
_________________________
6. Ions formed out of molecules are referred to as KLOBZGLNRX ions.
_________________________
7. All bases contain negatively charged SBWILCRWV ions.
_________________________
8. Organic compounds are formed through XLEZOVMG bonds.
_________________________
© Copyright 1999 AIMS Multimedia Compounds: Electromagnetic Attraction in Molecules