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
aivan3 [116]
2 years ago
8

Can someone PLEASE help me! I have missed a few days of school due to sickness and my teacher is making me make up a lab! She ga

ve me some things to study, but Chemistry is NOT one of my strong suits by any means! I only have 3 questions! I will post them separately to save room. Here is the first.
1. List at least two chemical reactions that result in a yellow, orange, or red precipitate. For these reactions list the possible chemical name of the precipitate. What do these reactions (and the others similar to them) have in common?
Chemistry
1 answer:
OLEGan [10]2 years ago
3 0
<span>2,4-dinitrophenylhydrazine (Brady’s reagent) is an important reagent related to hydrazine. Most aldehydes and ketones very readily with this reagent to give the yellow orange and red precipitates of 2,4-dinitrophenylhydrazones.
Unconjugated aldehydes and ketones give precipitates toward the yellow while conjugated compound tend to be deeper colour of red.
The conversion of aldehydes and ketones into hydrazone is an example of the addition-elimination reaction occurring at the unsaturated carbonyl group.</span>
You might be interested in
Write the overall reaction for cellular respiration
goblinko [34]
C6H12O6 + 6 O2 --> 6 CO2 + 6 H2O
7 0
3 years ago
How many moles of methane (CH4) could be made from 4.6 moles of hydrogen?
DENIUS [597]

Answer:

Number of moles of methane form = 2.3 mol

Explanation:

Given data:

Number of moles of Hydrogen = 4.6 mol

Number of moles of methane form = ?

Solution:

Chemical equation:

C + 2H₂     →   CH₄

Now we will compare the moles of methane with hydrogen from balance chemical equation.

                     H₂              :           CH₄

                       2              :             1

                     4.6             :            1/2×4.6 = 2.3 mol  

Form 3.6 moles of hydrogen 2.3 moles of methane can be formed.

6 0
3 years ago
In order for a process to be spontaneous, Multiple Choice the entropy of the surroundings must increase. the entropy of the surr
Crazy boy [7]

Answer:

The correct answer is entropy change of the surrounding plus the entropy change of the system must be positive.

Explanation:

The term entropy is a state function.Entropy can be defined as the disorder or randomness of the molecules in a system.

 A spontaneous reaction is a type of reaction which deals with the release of free energy.The change of free energy in case of spontaneous reaction is always negative.

 According to the second law of thermodynamics a spontaneous reaction will occur in a system if the total entropy of both  system and surrounding increases during the reaction.

8 0
2 years ago
Answer will mark bl plz
lesya692 [45]

Answer:

A

Explanation:

The mallet transfers kinetic energy, then that energy is transferred to the orange ball, then the purple ball, thus making the purple ball move

3 0
3 years ago
V=5, M=10 What is the density?
ch4aika [34]

Answer:

the answer to this question is  2 kilogram/cubic meter

Explanation:

4 0
3 years ago
Other questions:
  • Determine the oxidation number of oxygen in the carbonate ion found in malachite
    5·1 answer
  • Which of the following is not evidence of a chemical change?
    9·1 answer
  • Ethanol, CH.0, is common beverage alcohol. At its boiling point of 78.5 °C, the enthalpy of vaporization of ethanol is 38.6 kJ/m
    8·1 answer
  • Your lab partner told you that he measured out 25.0 mL of the unknown acid solution. But he actually went above the line on the
    12·1 answer
  • What solutions do we need to work on to get accurate results?<br> A) concentrated<br> B) diluted
    12·1 answer
  • Do liquids have higher coefficients of expansion than solids do
    13·1 answer
  • ASAP WILL GET BRAINLIEST IF CORRECT!!!!!!!!!!!!!!!!
    10·1 answer
  • which of the following would remain a liquid longest as the temperature continues to drop? propane, octane, hexane, ethane
    9·1 answer
  • **URGENT!!*** Compare lithium (Li) in group Ia (1) to fluorine (F) is in group VIIa (17). Does each element want to give or take
    14·1 answer
  • Hybridization of Al in AlF3
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!