Question

date:
teamwork makes the dream work: read the question and then answer within the table with your partner. for questions that are multiple choice, include an explanation of your answer selection.

formula	compound/element/molecule?	atoms
cl₂	molecule	2 chlorine atoms
ag	element	1 silver atom
c₃h₆o
nah₂o₅
na₄
au
co
★ anything below in the table is extra exploration ★
c₆h₁₂o₆
nacl
nh₃
bo
clf₃ (chlorine tri fluoride)
h₅io₆

1. which of the following below is a compound?

a) h₂
b) s₄
c) o
d) no₂

1. which of the following below is an element?

a) ca
b) oh
c) bp
d) c₃

image: a square with 123 ah! 239 the element of surprise!

Explanation:

Question 1

A compound is a substance made of two or more different elements chemically bonded. \(H_2\) (a) and \(S_4\) (b) are molecules of single elements (hydrogen, sulfur). \(O\) (c) is an element. \(NO_2\) (d) has nitrogen and oxygen (two different elements), so it's a compound.

An element is a pure substance with one type of atom. \(Ca\) (a) is a single element (calcium). \(OH\) (b) is a group (not an element), \(BP\) (c) has two elements (boron, phosphorus), \(C_3\) (d) is a molecule of carbon (but the question likely expects the single - atom element representation; \(Ca\) is a single element symbol).

Answer:

d. \(NO_2\)

Question 2