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
asambeis [7]
3 years ago
6

When a sample is heated water is observed at the top of the tube. The compound melts and changes color. Te residue is not entire

ly soluble. It is most likely Select one: a. a carbohydrate b. a hydrate c. efflorescent d. deliquescent
Chemistry
1 answer:
harkovskaia [24]3 years ago
7 0

Answer:

hydrate

Explanation:

when a hydrate is heated,it changes color due to the exothermic reaction taking place.the structure of the complex changes but not entirely.this result in the sample to to not dissolve completely and we can observe the small traces of the sample.

You might be interested in
A spring toy is moving down steps, What happens to the energy of the toy?
tamaranim1 [39]
When the toy is falling down the steps some of the Kinetic energy is changing to potential energy. As it is still falling some of the potential energy changes to kinetic energy.


Hope this helps
7 0
3 years ago
Calcium and water form calcium hydroxide and hydrogen gas also called what type of reaction
Gekata [30.6K]
Reaction of calcium with water
Calcium reacts slowly with water. This is in contrast with magnesium, immediately above calcium in the periodic table, which is virtually unreactive with cold water. The reaction forms calcium hydroxide, Ca(OH)2 and hydrogen gas (H2).
4 0
3 years ago
If you looked at a glass containing a solution and a glass containing a suspension, how could you tell which glass contained the
marin [14]
Over time, the particles in the suspension would settle to the bottom when the movement keeping them suspended fades away. This will not happen with a solution.
6 0
2 years ago
B. if 6.73 g of na2co3 is dissolved in enough water to make 250. ml of solution, what is the molar concentration of sodium carbo
BARSIC [14]

Answer:- [Na_2CO_3]=0.254M , [Na^+]=0.508 M , [CO_3^2^-]=0.254M

Solution:- We are asked to calculate the molarity of sodium carbonate solution as well as the sodium and carbonate ions.

Molarity is moles of solute per liter of solution. We have been given with 6.73 grams of sodium carbonate and the volume of solution is 250.mL.  Grams are converted to moles and mL are converted to L and finally the moles are divided by liters to get the molarity of sodium carbonate.

Molar mass of sodium carbonate is 105.99 gram per mol. The calculations for the molarity of sodium carbonate are shown below:

\frac{6.73gNa_2CO_3}{250.mL}(\frac{1mol}{105.99g})(\frac{1000mL}{1L})

= 0.254MNa_2CO_3

So, molarity of sodium carbonate solution is 0.254 M.

sodium carbonate dissociate to give the ions as:

Na_2CO_3(aq)\rightarrow 2Na^+(aq)+CO_3^2^-

There is 1:2 mol ratio between sodium carbonate and sodium ion. So, the molarity of sodium ion will be two times of sodium carbonate molarity.

[Na^+]=2(0.254M) = 0.508 M

There is 1:1 mol ratio between sodium carbonate and carbonate ion. So, the molarity of carbonate ion will be equal to the molarity of sodium carbonate.

[CO_3^2^-]=0.254M


5 0
3 years ago
Any element above 92 on the
Fynjy0 [20]
False
explanation

All of the elements with atomic numbers 1 to 92 can be found in nature, have stable or very long half-life isotopes, and are created as common products of the decay of uranium and thorium.
5 0
2 years ago
Read 2 more answers
Other questions:
  • BRAINLIESTTT ASAP!!! PLEASE HELP ME :)
    15·1 answer
  • What characteristic of an epic hero does this passage
    15·1 answer
  • You have been working to develop a new fictitious compound in the lab. Determine the amount in units of moles​ [mol] of 40 grams
    10·1 answer
  • Explain what states are changing in these examples
    14·1 answer
  • The label on a tub of margarine states that 100 g of the margarine contains 0·70 g of sodium. The sodium is present as sodium ch
    14·1 answer
  • All of the following are conductors of electricity except
    9·1 answer
  • A student prepares a standardized solution of sodium hydroxide by the procedure outlined. The student first prepares a saturated
    14·1 answer
  • What is the type of transport happens with very Large Nutrients or Lare Bunch of<br> wasted?
    6·1 answer
  • a piece of metal is heated to 100℃ and placed into 75.0g of water in a coffee-cup calorimeter. Initially, the temperature of the
    12·1 answer
  • What is the original source of all energy for animals? (1 point)
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!