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
gladu [14]
3 years ago
8

Which scientist discovered that the atomic number, rather than the atomic weight, is more responsible for the properties of an e

lement? (tragically this scientist died soon after as a soldier in wwi.) 1. millikin 2. moseley 3. st. augustine 4. rutherford 5. chadwick?
Chemistry
1 answer:
myrzilka [38]3 years ago
3 0

<em>Answer:</em>

  • The correct option is Moseley who has discovered the atomic number.

<em>Explanation:</em>

  • In 1913, H. Moseley discovered a new properties of an element atomic number. He observed that elements in the periodic table can be arranged better according to atomic number rather than atomic mass.
  • The atomic number of any elements is always equal to numbers of electrons in it.
You might be interested in
How many Molecules are in 20 grams of CO?
Mademuasel [1]

Answer:

2.74 x 1023 molecules of CO2.

Explanation:

There are 2.74 x 1023 molecules of CO2.

7 0
2 years ago
For the reaction represented by the equation Fe + H2O ® Fe2O3 + H2, how many moles of iron(III) oxide are produced from 285 g of
schepotkina [342]

Balanced equation: 2Fe + 3H2O → Fe2O3 +3H2

Convert g to mols:

285/55.845 = 5.1034 mols

Mole ratio of Iron and Iron (III) Oxide: 2:1

5.1034/2 = 2.5517 mols

8 0
2 years ago
Explain how the mid-ocean ridge supports<br> the theory of sea floor spreading.<br> help plzzz:(
Sedaia [141]
The ridge of mid ocean b is the answer hope this helps
4 0
3 years ago
The process of cell division that creates sex cells in sexually reproducing organisms is called
Mashcka [7]
The answer is meiosis. Not Mitosis


7 0
3 years ago
Read 2 more answers
Calculate the pH of 1.00 L of a buffer that contains 0.105 M HNO2 and 0.170 M NaNO2. What is the pH of the same buffer after the
kari74 [83]

Answer:

1.- pH =3.61

2.-pH =3.53

Explanation:

In the first part of this problem we can compute the pH of the buffer by making use of the Henderson-Hasselbach equation,

pH = pKa + log [A⁻]/[HA]

where [A⁻] is the conjugate base anion concentration ( [NO₂⁻]), [HA] is the weak acid concentration,[HNO₂].

In the second part, our strategy has to take into account that some of the weak base NO₂⁻ will be consumed by reaction with the very strong acid HCl. Thus, first we will calculate the new concentrations, and then find the new pH similar to the first part.

First Part

pH  = 3.40+ log {0.170 /0.105}

pH =  3.61

Second Part

# mol HCl = ( 0.001 L ) x 12.0 mol / L = 0.012

# mol NaNO₂ reacted = 0.012 mol ( 1: 1 reaction)

# mol NaNO₂ initial = 0.170 mol/L x 1 L = 0.170 mol

# mol NaNO₂ remaining = (0.170 - 0.012) mol  = 0.158

# mol HNO₂ produced = 0.012 mol

# mol HNO₂ initial = 0.105

# new mol HNO₂ = (0.105 + 0.012) mol = 0.117 mol

Now we are ready to use the Henderson-Hasselbach with the new ration. Notice that we dont have to calculate the concentration (M) since we are using a ratio.

pH = 3.40 + log {0.158/.0117}

pH = 3.53

Notice there is little variation in the pH of the buffer. That is the usefulness of buffers.

4 0
3 years ago
Read 2 more answers
Other questions:
  • Write a balanced chemical equation for each of the following.
    5·2 answers
  • What is the driving force for the reaction of HCl(aq) and NaOH(aq)?
    10·1 answer
  • Why are the electrons in metallic bonding referred to as “ delocalized”?
    10·1 answer
  • Most of an atom consists of empty space. Its mass is concentrated in its center, which is called the
    10·1 answer
  • What two particles must a substance particles exhibit in order to conduct electricity
    5·1 answer
  • An ideal gas is made up of gas particles that...
    11·1 answer
  • Riley let his friend borrow $12,750. He wants to be paid back in 57 months and is going to charge his friend a 5.5% interest rat
    15·1 answer
  • A block of iron has a mass of 826 g. What is the volume of the block of iron whose density at 25°C is 7.9 ?
    7·1 answer
  • Energy is transferred from the sun to Earth mainly by
    5·1 answer
  • Help for this practice work
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!