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
DanielleElmas [232]
3 years ago
8

Which of the following temperature is the coldest:

Chemistry
2 answers:
Vaselesa [24]3 years ago
8 0
1 -20 degree celsius
BartSMP [9]3 years ago
4 0
1- 20 degree celsius
You might be interested in
Which or these equations is balanced H2SO4 + 2Al > Al2(SO4)3 + H2 or 2KCl + Pb(NO3)2 > 2KNO3 + PbCl2
Dmitry_Shevchenko [17]

Balancing of chemical equation is essential because of the law of conservation of mass, which states that the mass of a system can not be created or removed.

The second equation is balanced

2KCl_(_a_q_) +Pb(NO_3)_2_(_a_q_) ==> 2KNO_3_(-a_q_) + PbCl_2(_a_q_)

This is because the number of elements of each atom in the product side equal the number of elements of each atom on the reactant side.

The first equation is not balanced

H_2SO_4 _(_a_q) + 2Al_(_s_) ==> Al(SO_4)_3_(_a_q_) + H_2_(_g_)

This is because there is 1 molecule of SO_4^{-2} on reactant side as compared to 3 molecules of SO_4^{-2}

To balance the equation we add a coefficient of 3 on sulphuric acid (H_2SO_4) and a coefficient of 3 on hydrogen (H_2)

3H_2SO_4_(_a_q_) + 2Al_(_s_) ==> Al(SO_4)_3_(_a_q_) + 3H_2_(_g_)

7 0
3 years ago
Draw the structure of the product of each step in the following three-step synthesis. Show the formal charges, if applicable. As
Dvinal [7]

Answer:

Second step: 4-bromo-1-methyl-2-nitrobenzene.

Third step: 1.5-dibromo-2-methyl-3-nitrobenzene.

Explanation:

To solve this exercise I will use the concepts of electrophilic substitution. In these reactions, a functional group is displaced by an electrophile. In the attached image are the two main products.

5 0
3 years ago
The surface forces that change the surface of the earth are:
pshichka [43]
Number one victory royal yaaa
5 0
2 years ago
How many valence electrons does the Lewis structure for a chlorine atom show
ohaa [14]

Answer: D

Explanation:

Chlorine is in group 7 or (VII) in Roman numerals, which means it has 7 balance electrons. It only needs one electron to become stable, hence it is next to the noble gases

6 0
3 years ago
Read 2 more answers
Determine the energy associated with an e- in hydrogen at n=2 to n=4
jeka57 [31]

Answer:

Kinetic energy of electron = -E₂ = 3.4 ev

Kinetic energy of electron = -E₄ = 0.85 ev

Explanation:

In case of hydrogen atom energy associated with nth state is,

En =  -13.6/n²

For n = 2

E₂ = -13.6 / 2²

E₂ = -13.6/4

E₂ = -3.4 ev

Kinetic energy of electron = -E₂ = 3.4 ev

For n = 4

E₄ = -13.6 / 4²

E₄ = -13.6/16

E₄ = -0.85 ev

Kinetic energy of electron = -E₄ = 0.85 ev

6 0
3 years ago
Other questions:
  • The name of CH3CH2CH2CH2CH2CONH2 is:<br> hexanamide<br> butanamide<br> pentanamide<br> O heptanamide
    7·1 answer
  • Ben put 100 ml of water and 100 ml of oil in a beaker then he stirred the mixture. Which is the best way to quickly separate the
    10·1 answer
  • When do we classify a disease as epidemic
    14·2 answers
  • A geochemist measures the concentration of salt dissolved in Lake Parsons, an isolated salt lake. He finds a concentration of 21
    15·1 answer
  • Which physical change is endothermic
    14·1 answer
  • PLease answer the thing and explain why is that...
    11·1 answer
  • Rsy-feiu-xad j0in only girlś​
    7·2 answers
  • A container with a volume of 893L contains how may moles of air at STP?
    11·1 answer
  • Conversación de masa 3,6kg a g​
    14·1 answer
  • If the chemist mistakenly makes 250 mL of solution instead of the 200 mL, what molar concentration of sodium nitrate will the ch
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!