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
Goryan [66]
3 years ago
11

Complete the chemical equation for this reaction.

Chemistry
1 answer:
faust18 [17]3 years ago
4 0
Ca + 2H2O -> Ca(OH)2 + H2
You might be interested in
true or false: Mendeleev's arrangement of elements in the periodic table was based on the observations and experiments of his pr
Oduvanchick [21]

This answer is true

7 0
3 years ago
Read 2 more answers
What is paper chromatography? Calculate the Rr value of a colored dye that traveled 52 mm on a chromatography strip while the so
Karo-lina-s [1.5K]

Answer:

Paper chromatography is a basic technique of chromatography. It consist in the separation of the mixe components using a solvent.

Explanation:

Paper chromatography is a basic technique of chromatography. It consists in the separation of the mixed components using a solvent.

Paper chromatography consists of put some dot of the mix using a glass capillary into a specialized paper, generally made of cellulose, this is called a stationary phase.

Then you put this paper into a camera of glass named, chromatography camera, where previously contain a solvent. The solvent also know as a mobile phase, the type can be defined before the test and involves a study of the kind of the mix, and the compound you want to separate.

The chromatography camera has to be closed all the time during the test, and you can't move at all because the movement of the solvent can alternate the result.

Very often, the solution of the solvent is a mix of different liquid substances with different polarities.

When the stationary phase put into the camera, the solvent starts to move up over the paper, until the separation of the compounds is observable.

the Rf is a value who relates the move of the mobile phase with the move of the distance traveled by the substance tested.

To undersant the paper chromatography, you can watch the images attached.

The first is an image of the chromatography camera.

The second one is an image of a cellulose paper after the chromatography is done. You can watch the dots who indicates the traveling of the compound across the paper.

The third one can show you the evolutions of paper chromatography, from the beginning to the end.

To calculate the Rf value you have to use the equation:

Rf = distance traveled by the substance/distance traveled by the solvent/

<u>Rf = 52mm/81mm =0.64</u>

<u></u>

3 0
3 years ago
Which of the following statements correctly relates mutations and survival rates of plants?
Tasya [4]
Answer is: <span>Mutations sometimes improve the chances of survival for a plant.
</span>Mutations are very important because they change <span>variability in populations and in that way enable evolutionary change.
</span>There are three types of mutations:
1) good or advantageous mutations - <span> improve the chances of survival for a plant.
2) </span>bad or deleterious - decrease the chances of survival for a plant.
3) neutral -  not affect he chances of survival for a plant.
3 0
3 years ago
What is the percent composition by mass of each element in Co(HSO4)2?
MrRissso [65]

Answer:

54.1 % Ca, 43.2 % O, 2.7% H

Explanation:

Molecular formula for calcium hydroxide is Ca(OH)₂

As we don't have a mass of Ca(OH)₂ to find out the percentage composition, we consider that the question refers to 1 mol of compound.

1 mol of hydroxide weighs 74.08 g

1 mol of hydroxide has 1 mol of Ca, therefore 40.08 g are Ca

2 moles of O therefore 32g are O

2 moles of H therefore 2 g are H

Percentage composition is known as (Mass of element/Total mass) . 100

(40.08 / 74.08) . 100 = 54.1 %

(32 / 74.08) . 100 = 43.2 %

(2 / 74.08) . 100 = 2.7%

im a smart one

7 0
2 years ago
Who conducted experiments to determine the quantity of charge
____ [38]

J. J. Thomson is the corect awncer

5 0
3 years ago
Other questions:
  • How many molecules of co2 are equivalent to 112g of CO2
    6·2 answers
  • Identify the type of reaction:
    6·1 answer
  • Convert 6.3x1024 molecules of water to liters.
    9·1 answer
  • Which of the following best describes a non metal
    12·2 answers
  • Convert 325 cm of copper (Cu) wire into mm of Cu<br> wire.
    5·1 answer
  • Plz PLZ plz PLz Plz Plz Help Plz dont answer if you dont know thank you :)
    10·2 answers
  • Considering 2N2H4(g) + N2O4(g) -&gt; 3N2(g) +4H2O(g)
    11·1 answer
  • When electrons in a molecule are not found between a pair of atoms but move throughout the molecule, this is called Group of ans
    5·1 answer
  • What do the red arrows represent
    6·1 answer
  • NEED HELP!
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!