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
wel
3 years ago
9

The distribution of grades on a final exam

Chemistry
1 answer:
umka2103 [35]3 years ago
3 0

Answer: the answer is a histogram

Explanation:

You might be interested in
Maple has a sample of graphite, which is made up of carbon atoms. She has 1.810 x 1024 atoms of carbon. What is the mass of this
Lera25 [3.4K]

Answer:

  about 36.10 g

Explanation:

The proportion of interest is ...

  mass/atoms = x/(1.810·10^24) = (12.0107 g)/(6.02214076·10^23)

Multiplying by 1.810·10^24, we find the mass of the sample to be ...

  x = 36.0991 g

The mass of the sample is about 36.10 grams (to 4 s.f.).

4 0
3 years ago
Read 2 more answers
Useful:<br>Harmful:<br>2. Give an example of how Bacteria can be useful and harmful to man.​
kupik [55]

Answer:

normal flora useful

Explanation:

protect the skin

5 0
3 years ago
During a combustion reaction, 9.00 grams of oxygen reacted with 3.00 grams of CH4.
Monica [59]

Answer:

0.74 grams of methane

Explanation:

The balanced equation of the combustion reaction of methane with oxygen is:

  • CH₄ + 2 O₂ → CO₂ + 2 H₂O

it is clear that 1 mol of CH₄ reacts with 2 mol of O₂.

firstly, we need to calculate the number of moles of both

for CH₄:

number of moles = mass / molar mass = (3.00 g) /  (16.00 g/mol) = 0.1875 mol.

for O₂:

number of moles = mass / molar mass = (9.00 g) /  (32.00 g/mol) = 0.2812 mol.

  • it is clear that O₂ is the limiting reactant and methane will leftover.

using cross multiplication

1 mol of  CH₄ needs → 2 mol of O₂

???  mol of  CH₄  needs → 0.2812 mol of O₂

∴ the number of mol of CH₄ needed = (0.2812 * 1) / 2 = 0.1406 mol

so 0.14 mol will react and the remaining CH₄

mol of CH₄ left over = 0.1875 -0.1406 = 0.0469 mol

now we convert moles into grams

mass of CH₄ left over = no. of mol of CH₄ left over *  molar mass

                                    = 0.0469 mol * 16 g/mol = 0.7504 g

So, the right choice is 0.74 grams of methane

3 0
3 years ago
how does the structure of atoms (i.e. protons, neutron, and electrons) affect the electric charge of an object or substance.
pickupchik [31]

Electrons contribute greatly to the atom's charge, as each electron has a negative charge equal to the positive charge of a proton. Scientists define these charges as “+1” and “-1. ” In an uncharged, neutral atom, the number of electrons orbiting the nucleus is equal to the number of protons inside the nucleus.:

8 0
3 years ago
Can Someone help me with this ​
vodomira [7]

Answer:

1. Mg²⁺   2. Cl⁻    3. PO₄³⁻

Explanation:

6 0
3 years ago
Read 2 more answers
Other questions:
  • Why is velocity mean always greater than the most probable velocity?
    12·1 answer
  • n unknown weak acid, HA, it titrated with 0.6 M NaOH. The pH at the halfway point of this titration was found to be 4.215. If th
    10·1 answer
  • Which solid conducts electricity most efficiently?
    13·2 answers
  • How many grams of O2(g) are needed to completely burn 48.5 g of C3H8(g)?
    14·2 answers
  • 15.0 g of unknown metal heated to 140c breaker holds 150g of 25c water the hot metal cools down water heats up until both ending
    10·1 answer
  • Please help ASAP- Explain the difference in electrical conductivity between solid strontium chloride and liquid strontium chlori
    7·1 answer
  • Air pollution affects the environment, and it has many causes. Some types of pollution can be prevented. Classify these items as
    9·1 answer
  • Are transition metals reactive?
    12·1 answer
  • Now consider a sample of the gas at 33 deg C, 744 mm Hg, and 450 mL. If the pressure is decreased to 725 mm Hg and the temperatu
    12·1 answer
  • I need all the answers ASAP
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!