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
Naddik [55]
2 years ago
14

15 points will mark brainliest

Chemistry
2 answers:
dybincka [34]2 years ago
6 0

Answer:

Option b as 100 years before also rain was not there is sahara dessert and now also it is not there..

Vladimir [108]2 years ago
4 0
You got it right, the answer is d
You might be interested in
uranium atoms each have 92 protons. how many protons does each u238 atom have? a. 92 b. 146 c. 238 d. 330
Brilliant_brown [7]
Number of protons as stated in the question = 92.

a. 92
4 0
3 years ago
2. A rock occupies a volume of 20 cm and has a mass of 54 grams. Find the density of<br> this rock.
vredina [299]
The answer is 2.7gm/cm^3 . Density is mass divided by volume .
6 0
3 years ago
Ductile means...
balu736 [363]

Answer:

A

Explanation:

3 0
2 years ago
Draw an electrolytic cell in which Mn2+ is reduced to Mn and Sn is oxidized to Sn2+. (Assume standard conditions).
babunello [35]

Answer:

-1.05 V

Explanation:

A detailed diagram of the setup as required in the question is shown in the image attached to this answer. The electrolytes chosen are SnCl2 for the anode half cell and MnCl2 for the cathode half cell. Tin rod and manganese rod are used as the anode and cathode materials respectively. Electrons flow from anode to cathode as indicated. The battery connected to the set up drives this non spontaneous electrolytic process.

Oxidation half equation;

Sn(s) ------> Sn^2+(aq) + 2e

Reduction half equation:

Mn^2+(aq) + 2e ----> Mn(s)

Cell voltage= E°cathode - E°anode

E°cathode= -1.19V

E°anode= -0.14 V

Cell voltage= -1.19 V - (-0.14V)

Cell voltage= -1.05 V

8 0
3 years ago
How many grams of Mg are needed to produce 224 g of MgO in the complete reaction of Mg
zmey [24]

Answer:

134.4 g of Mg

Explanation:

reaction:

2Mg + O2 ➡️ 2MgO

1) find the mol of MgO

mol = mass / molar mass

mass = 224 g

molar mass = 24+16 = 40

mol = 224 / 40

= 5.6 moles

2 mol = 5.6 moles

2) find the mass of Mg

mass = mol × molar mass

mol = 5.6

molar mass = 24

mass = 5.6 × 24

= 134.4 g

7 0
3 years ago
Other questions:
  • Find the temperature at which ethanol boils on a day in the mountains
    5·1 answer
  • A 50 mL beaker has an uncertainty of ± 10%. What is the absolute uncertainty for this beaker?
    7·2 answers
  • Some amount of water is evaporated from a 2.0 L, 0.2 M NaI solution, to from a 1.0 L solution. The molar mass of NaI is 150 g/mo
    8·1 answer
  • The atomic number of sulfur is 16, which indicates that a sulfur atom contains
    7·1 answer
  • If an atom has 29 electrons and a mass of 64, and it is neutral, what is the name of the atom?
    11·1 answer
  • True or false: seafloor spreading takes place along a mid ocean ride
    9·1 answer
  • How much does calcite coast
    5·1 answer
  • In the following reaction the iodide ion (I-) in HI is oxidized by the permanganate ion (MnO4-). A 5.0 mL solution of 0.20M HI r
    8·1 answer
  • Is this correct please check!!!
    12·2 answers
  • If the order of a reaction with the regard to reagent A is 2, when the concentration of A doubles, the rate will
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!