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
Lena [83]
3 years ago
15

NEED ANSWER FAST !!

Chemistry
1 answer:
Ilia_Sergeevich [38]3 years ago
7 0

Answer:

.-.

Explanation:

You might be interested in
The energy released during ________ reactions can be used to drive ________ reactions, and this is called ________ reactions.
SpyIntel [72]

Answer:

D. exergonic; endergonic; coupled

6 0
4 years ago
Read 2 more answers
Fossils of the reptile Mesosaurus were found in western Africa and eastern South America. Which statement might such findings su
pashok25 [27]
C. Remember Pangea, the two continents were one right next to each other
 

5 0
3 years ago
Read 2 more answers
307 g of an unknown mineral is heated to 98.7 °C and placed into a calorimeter that contains 72.4 g of water at 23.6 °C. The hea
RSB [31]

Answer:

0.138 J/g.K

Explanation:

According to the law of conservation of energy, the sum of the heat released bt he mineral and the heats absorbed by the water and the calorimeter is equal to zero.

Qm + Qw + Qc = 0

Qm = - Qw - Qc   [1]

The heat absorbed by the calorimeter can be calculated using the following expression.

Q = C . ΔT

where,

C is the heat capacity

ΔT is the change in temperature

The heat released by the mineral and the one absorbed by the water can be calculated using the following expression.

Q = c . m . ΔT

where,

c is the specific heat capacity

m is the mass

ΔT is the change in temperature

Replacing in [1],

Qm = -Qw - Qc\\c_{m}.m_{m}.\Delta T_{m}=-c_{w}.m_{w}.\Delta T_{w}-C_{c}.\Delta T_{c}\\c_{m}=\frac{-c_{w}.m_{w}.\Delta T_{w}-C_{c}.\Delta T_{c}}{m_{m}.\Delta T_{m}} \\c_{m}=\frac{-(4.18J/g.K).(72.4g).(305.4K-296.6K)-(15.7J/K).(305.4K-296.6K) }{(307g).(305.4K-371.7K)} \\c_{m}=0.138J/g.K

6 0
3 years ago
Can sum1 please help me? if u can
kiruha [24]

Answer:

donde estan las preguntas

Explanation:

6 0
3 years ago
The azide ion, n−3, is a symmetrical ion, all of whose contributing structures have formal charges. draw three important contrib
GREYUIT [131]

The azide ion N3- can actually be represented by 3 resonance structures.

(check attached image for the structures)

 

<span>Among the three, the Structure 1 is the most important one. While structure 3 almost makes no contribution due to the positive charges located on the adjacent atoms and the overall higher formal charge.</span>

3 0
4 years ago
Read 2 more answers
Other questions:
  • The mass of a neutron is
    11·1 answer
  • Answer the question please
    14·1 answer
  • The reaction between sodium and oxygen ( balanced with words)
    14·1 answer
  • Difference between ca and ca2+
    12·1 answer
  • Which of the following is a polyatomic element ?<br> 1-s8<br> 2-co<br> 3-Na<br> 4-Cl2
    9·2 answers
  • Niels Bohr proposed his model of the atom about ________
    9·2 answers
  • Hey, can someone help me with this :( I've looked all over my book and I can't figure it out. it's a true or false question and
    7·1 answer
  • Which statements explain the relationship between photosynthesis and cellular respiration? Select two options.
    15·1 answer
  • What is the percentage concentration of sugar and pink lemonade 28G of sugar is added to 209G of water
    6·1 answer
  • Carbohydrates like sugars and starches are made of only three elements: carbon (C), hydrogen (H), and oxygen (O). How is it poss
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!