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
Oksanka [162]
4 years ago
13

Marie Curie was the recipient of two Nobel Prizes—a shared prize in physics and an individual prize in chemistry. Her chemistry

prize was for discovering two new elements, polonium and radium. For what did she, her husband, and Henri Becquerel receive the physics prize?
-The discovery that radioactivity is an extensive property that can be measured precisely.
-The discovery that certain substances can phosphoresce.
-The discovery that radioactivity is caused by the decay of unstable atomic nuclei.
-The discovery that radioactivity can ionize gas in a chamber.
Chemistry
2 answers:
Mkey [24]4 years ago
6 0
A) <span>The discovery that radioactivity is an extensive property that can be measured precisely</span>
OlgaM077 [116]4 years ago
5 0
I just took the test and the answer is A. 
You might be interested in
Methionine, ch3sch2ch2ch(nh2)co2h, is an amino acid found in proteins. draw a lewis structure of this compound. what is the hybr
Evgesh-ka [11]

hybridization is defined as mixing up of the atomic orbital with nearly same energies according to linear combination of atomic orbitals. the orbitals formed are equal in energy and are called hybrid orbitals .

6 0
3 years ago
Cyclohexane (δh° = 936 kcal/mol ) and methylcyclopentane (δh° = 941 kcal/mol) have the same molecular formula but different stra
nadya68 [22]
The difference of the structures of the two isomers are shown in the picture. Generally, cyclic alkanes are much easier to break than straight-chained alkanes. When the molecules are cyclic, they are close to each other, thus lesser bond angles. Because they are closer, repulsion forces could be greater than attractive forces. That is why cyclohexane needs lesser energy of 936 kcal/mol compared to 941 kcal/mol because there is an additional straight-chained methyl substituent to break in methylcyclopentane.

4 0
3 years ago
F 15 g of C₂H₆ reacts with 60.0 g of O₂, how many moles of water (H₂O) will be produced? (Hint: use what you know about limiting
Mars2501 [29]

Answer:

1.5 mol H2O

Explanation:

2C2H6 + 7O2 -> 4CO2 + 6H2O

The limiting reactant is C2H6

30 g C2H6 ->1 mol C2H6

15 g C2H6   -> x                      x= 0.5 mol C2H6

2 mol C2H6 -> 6 mol H2O

0.5 mol c2H6 -> x                    x = 1.5 mol H2O

4 0
4 years ago
How much charged is required to reduced 2 moles of cr6+ to cr3+
BartSMP [9]

Answer:

6e⁻

Explanation:

Charge in reducing 2 mole of Cr⁶⁺ to Cr³⁺

              Cr⁶⁺   +      xe⁻           →       Cr³⁺

The numbers 6+ and 3+ on the chromium atoms are the oxidation number of the atom.

It shows the number of electrons that has been lost by chromium in an oxidation state.

         Cr⁶⁺ shows that it has lost 6 electrons. When an atom loses electrons, the number of protons becomes more. This makes it positively charged in nature.

      This analogy goes for Cr³⁺

 Therefore, in going from reactants to products, chromium

                                6+      →    3+

 In this kind of expression, the number of atoms must be conserved and the charges too;

                        2Cr⁶⁺   +      xe⁻           →       2Cr³⁺

    given 2 moles of Cr;

               To balance the charge;

               2(6+) + x(-) = 2(3+)

                   12 - x = 6

                          x  = 6

A charge of 6e⁻ is required to reduce 2 mole of Cr⁶⁺ to Cr³⁺

6 0
4 years ago
Complete the sentence with the word "element" or "compound. O is a(n)_______ and H2O, is a(n)____​
nikdorinn [45]

Answer:

Element; compound

Explanation:

Oxygen is an element on the periodic table, but when it's combined with the element Hydrogen, it produces water, which is a compound (H2O). When two elements combine, it produces a compound.

I hope this helps! :)

8 0
3 years ago
Other questions:
  • How many moles of Cr are in 2.16 mol of Cr2O3?
    10·2 answers
  • How many grams of H2O will be produced if 750 grams of Fe are produced?<br><br> Fe3O4+ H2 → Fe+H2O
    9·1 answer
  • 1. How much heat is necessary to vaporize 500 g of water at its boiling point?
    7·1 answer
  • Calculate the average time it took the car to travel 0.25 What is the average time it took the car to travel 0.25
    5·2 answers
  • In the Lewis structure for ICl2–, how many lone pairs of electrons are around the central iodine atom.
    12·1 answer
  • Why had americans developed a tradition of waste?
    10·1 answer
  • The periodic table displays A. only the important compounds that exist in the world. B. only the important elements that exist i
    5·2 answers
  • Hi guys lemme know in the comments what you need help with. Also if you’re bored like me we can talk in the comments. ♥️
    5·2 answers
  • A gas has a volume of 250.0 liters at 17.0 °C and 3.00 atm of pressure. what volume must the gas be increased for the gas to be
    15·1 answer
  • When naming bases, you add ___ to the end
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!