Question

blow out the cobwebs review

1. sketch and label particle diagrams to illustrate examples of each of the following: an element, a compound, a mixture, and a pure substance
2. sketch a before/after particle diagram of a chemical change and a physical change. label each diagram with important vocabulary.

write the formulas for each of the following binary molecular compounds.

1. nitrogen tribromide
2. phosphorus pentachloride
3. sulfur dioxide
4. boron trifluoride
5. disulfur decafluoride
6. iodine pentoxide
7. nitrogen monoxide

write the names for each of the following binary molecular compounds.

1. cf₄
2. p₂o₅
3. co
4. brcl₃
5. no₂
6. i₂o₅
7. bcl₃

Explanation:

Question 3:

Step1: Identify prefixes and elements

Nitrogen (N) has no prefix (mono- is omitted for first element), tribromide means 3 bromine (Br) atoms.

Step2: Write formula

Combine elements with subscripts: $NBr_3$

Step1: Identify prefixes and elements

Phosphorus (P) has no prefix, pentachloride means 5 chlorine (Cl) atoms.

Step2: Write formula

Combine elements with subscripts: $PCl_5$

Step1: Identify prefixes and elements

Sulfur (S) has no prefix, dioxide means 2 oxygen (O) atoms.

Step2: Write formula

Combine elements with subscripts: $SO_2$

Answer:

$NBr_3$

Question 4: