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
pychu [463]
3 years ago
7

A student is given two clear solutions. One solution contained lead ions, Pb2+ and the other solution contains chloride ions, Cl

-. When the two solutions are mixed, a clear solution with white powder at the bottom results. What has happen to cause this change?
Chemistry
2 answers:
larisa86 [58]3 years ago
4 0
<span>A chemical change has occurred creating a precipitate. 
Just had that question on a quiz. XP

Hope I helped :)</span>
Sloan [31]3 years ago
4 0

Answer: A chemical change has occurred.

Explanation: A chemical change is a change which results when there is a change in the chemical composition of the atoms.

Chemical changes are accompanied by:

a) Change in color

b) Absorption or release of heat

c) formation of precipitates

d) production of gas

Pb^{2+]+2Cl^-\rightarrow PbCl_2(s)

The white powder is precipitates of lead chloride PbCl_2(s) which do not dissolve.


You might be interested in
What happens in the body when we break down carbohydrates? Explain the whole course of events.
JulsSmile [24]

Answer:

Energetic molecules are formed, or rather the energetic currency to be able to live, which we call ATP.

Explanation:

ATP is a molecule that arises from the degradation of carbohydrates, these are destroyed for the first time in the mouth by the enzyme salivary amylase, then by the stomach, and finally they are absorbed in the intestine in the form of glucose, this glucose enters the bloodstream, entering the cells through insulin.

Once glucose is entered into the cell, it completes an energetic cycle, called the krebs cycle, which provides 36 to 38 ATP.

Atp, is adenosine tri phosphate, phosphate bonds protect a lot of energy, this is how the body generates the following reaction when it needs energy, releasing energy to the environment to be able to produce from locomotion to respiration:

ATP -----> ADP + Pi

8 0
3 years ago
EASY 8TH GRADE SCIENCE
mixer [17]
Generally chemists measure substance in moles because it is very difficult to count the number of molecules<span />
6 0
3 years ago
Read 2 more answers
20 cubic inches of a gas with an absolute pressure of 5 psi is compressed until its pressure reaches 10 psi. What's the new volu
belka [17]
10 cubic inches
We will use Boyle's law that states that for a fixed amount of an ideal gas kept at a fixed temperature, pressure and volume are inversely proportional. 
P1 V1 = P2 V2
Where
 P1 is initial pressure = 5 psi
V1 is initial volume = 20 cubic inch
P2 is final pressure = 10 psi
V2 is final volume = unknown
V2 = P1,V1 / P2
V2 = 20 × 5 / 10
V2 = 100/10
V2 = 10 cubic inches


7 0
3 years ago
A 50.0 g sample of liquid water at 25.0 degree C is mixed with 29.0 g of water at 45 degree C. The final temperature of the wate
kotegsom [21]

<u>Answer:</u> The final temperature of water is 32.3°C

<u>Explanation:</u>

When two solutions are mixed, the amount of heat released by solution 1 (liquid water) will be equal to the amount of heat absorbed by solution 2 (liquid water)

Heat_{\text{absorbed}}=Heat_{\text{released}}

The equation used to calculate heat released or absorbed follows:

Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})

m_1\times c\times (T_{final}-T_1)=-[m_2\times c\times (T_{final}-T_2)]       ......(1)

where,

q = heat absorbed or released

m_1 = mass of solution 1 (liquid water) = 50.0 g

m_2 = mass of solution 2 (liquid water) = 29.0 g

T_{final} = final temperature = ?

T_1 = initial temperature of solution 1 = 25°C  = [273 + 25] = 298 K

T_2 = initial temperature of solution 2 = 45°C  = [273 + 45] = 318 K

c = specific heat of water= 4.18 J/g.K

Putting values in equation 1, we get:

50.0\times 4.18\times (T_{final}-298)=-[29.0\times 4.18\times (T_{final}-318)]\\\\T_{final}=305.3K

Converting this into degree Celsius, we use the conversion factor:

T(K)=T(^oC)+273

305.3=T(^oC)+273\\T(^oC)=(305.3-273)=32.3^oC

Hence, the final temperature of water is 32.3°C

7 0
3 years ago
The modern periodic table has groups.
Snezhnost [94]
Three groups

gases, metals, metalliods/nonmetals
3 0
3 years ago
Other questions:
  • How can you tell if a substance is a mixture or a compound
    14·1 answer
  • When 14.8 g KOH is dissolved in 85.6 g of water in a coffee-cup calorimeter, the temperature rises from 19.3 °C to 32.76 °C. Wha
    8·1 answer
  • Which response includes all the following that are properties of most metals, and no other properties?
    14·1 answer
  • HELP FAST PLZ!!!!
    13·1 answer
  • What is sexual reproduction is
    12·1 answer
  • Which of the following would make a solution?
    8·2 answers
  • The atoms of compounds are _____________ combined in some way. Often times they come together to form groups of atoms called mol
    13·2 answers
  • Give the location of the elements found in the periodic table which have the same number valence electrons.
    6·2 answers
  • Find the oxidation number of carbon in MgCO3​
    8·1 answer
  • Determine the spec gravity of 500 mL alcohol if the density is 0.79g/ml
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!