1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
tiny-mole [99]
3 years ago
11

Classify each of these statements as always true, AT, sometimes true, ST, or never true, NT. _____ 1. A mole of a pure substance

contains 6.02 x 1023 atoms. _____ 2. The representative particle of a compound is a molecule. _____ 3. A mole of CCl4 is composed of one atom of carbon and 4 atoms of chlorine. _____ 4. One mole of gas occupies 22.4 L _____ 5. The formula of methane is CH4. If methane contains 75% carbon, then 100 grams of methane contains 25 grams of carbon. _____ 6. The formula for methane CH4 is both an empirical and molecular formula. _____ 7. The empirical formula of C6H12O6 is C2H4O2.
Chemistry
1 answer:
poizon [28]3 years ago
8 0

Answer:

1. AT

2. NT

3. AT

4. ST

5. NT

6. AT

7.ST.

Explanation:

1. AT

This is so because a mole of a pure substance contains that number of atoms at any point in time. The only criterion needed there is if the compound is pure or not.

2. NT.

3.AT

IN CCl4, we have one atom of carbon and 4 atoms of chlorine.

4. ST

This is only true in some instances and not at all times. The relation is only true at s.t.p. It does not hold at other conditions which are not s.t.p

5. NT

Methane contains 75% carbon. It is only right that 100gm methane would contain more than what the hydrogen would have as it has a higher percentage by mass and hence the 25gm is wrong.

6. AT

YES. The molecular formula of methane is also it's empirical formula

7. ST

This is not always true as we have more than one way in which the outside multiple n can multiply the inner numbers to yield the molecular formula. In the case quoted above, n = 3. Analysis can also show that n = 6 in which case the empirical formula would be CH2O.

You might be interested in
When the first periodic table of the elements was published, the elements were arranged by atomic mass. Although
Oduvanchick [21]
Its. a c but im not sure. ??.?
4 0
3 years ago
An electrically neutral atom of oxygen has eight electrons. What other facts do you know for sure about this atom? 1.) there are
Sati [7]

2.) there are eight protons

6 0
3 years ago
Read 2 more answers
If 4.00 g of NaCl react with 10.00 g of AgNO3, what is the excess reactant?
Mekhanik [1.2K]
The reaction formula of this is NaCl + AgNO3 = NaNO3 + AgCl. The mole number of NaCl is 4/58.5=0.068 mol. The mole number of AgNO3 is 10/170=0.059 mol. So the NaCl is excess.
7 0
3 years ago
Read 2 more answers
A solution was prepared by mixing 0.5000 m hno2 with 0.380 m no2-. ka = 4.58 x 10-4. calculate the ph of the solution. show work
adell [148]

pH of buffer can be calculated as:

pH=pKa+log[salt]/[Acid]

As ka = 4.58 x 10-4

Concentration of [Salt] that is NO2(-1)=0.380M

Concentration of [Acid] that is HNO2=0.500M

So, pH= -log(4.58*10^-4)+log((0.380)/0.500))

=3.21

So pH of solution will be 3.21

7 0
3 years ago
You want to determine the effect of a certain fertilizer on the growth of orchids grown in a greenhouse.
Aleks [24]
Hypothesis - I predict that the orchids will grow best with a medium concentration of fertilizer
3 0
2 years ago
Other questions:
  • Be sure to answer all parts.
    5·2 answers
  • You have two 500.0 ml aqueous solutions. solution a is a solution of a metal nitrate that is 8.246% nitrogen by mass the ionic c
    12·1 answer
  • Water's _____ property creates positive and negative ions, which are essential for chemical reactions.
    10·2 answers
  • How many neutrons does 85Rb have?
    5·1 answer
  • Given the chemical formula, KNO3, what is the percent nitrogen in the compound?
    10·1 answer
  • Please help me write a portfolio. GIVING BRAINLIEST 50 POINTS
    15·2 answers
  • How many moles are in 6.5e23 atoms of Ne?
    8·1 answer
  • How do nuclear reactions (fusion & fission) compare to chemical reactions?
    14·1 answer
  • Which phrase is the best description of osmosis
    8·2 answers
  • The nurse is educating a patient with cirrhosis about the importance of maintaining a low-sodium diet. what food item would be p
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!