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
salantis [7]
2 years ago
8

How is enthalpy used to predict whether a reaction is endothermic or exothermic?

Chemistry
1 answer:
Sever21 [200]2 years ago
4 0
<span>The value of enthalpy of a reaction can be a useful tool in determining the type of reaction it is. If the enthalpy is negative the reaction is exothermic and if the enthalpy is positive the reaction is endothermic. Hope this answers the question. Have a nice day.</span>
You might be interested in
A chemical reaction takes place in a closed system. The mass of the reactants before the reaction was grams. What must the mass
Ad libitum [116K]

Answer:

D. 25 grams

Explanation:

I think that's what the answer is

7 0
3 years ago
HELP PLEASE I DONT KNOW WHAT THIS MEANS IM CONFUSED
Zielflug [23.3K]

Explanation:

In an alpha emission, an alpha particle is ejected from a large nucleus. An alpha particle is simply a helium nucleus (atomic number is 2 and mass number is 4) so that means that the atomic number of the emitting nucleus decreases by 2 and its mass number decreases by 4.

5 0
3 years ago
Which of the following represents positron emission? Select one: a. 3015P ---&gt; 3014Si + ___ b. 23892U ---&gt; 23490Th + ___ c
xxTIMURxx [149]
The simple trick which one can consider in such problem where it is asked for positron emission is :
<span>When the atomic number goes DOWN by one and mass number remains unchanged, then a positron is emitted.
</span>
<span>a.  </span>P^{30}_{15}  ----\ \textgreater \   Si^{30}_{14} + e^{0}_{1}^+
<span>
Here the atomic number decreases by one.

Similarly, options b and d are eliminated.

Option c is also not the answer.
For c, Count the atomic number on left side and compare it with right side. You will see it is 9 on left and 8 on right. Atomic no. did go down by 1. But the atomic mass is changed as well.

</span>
8 0
3 years ago
1.
Dahasolnce [82]

Answer:

22.5moles

Explanation:

using mole ratio,n(CO2)/n(o)=1/2

n(CO2)=1/2n(02)

n(CO2)=1/2×45

moles of carbon dioxide produced is 22.5moles

8 0
2 years ago
Complete the sentence indicating the number of protons and electrons in the given ion. Match the numbers in the left column to t
Cloud [144]

Answer: (Chlorine-35)

Element X is Ca

Explanation:

Number of proton plus the number of electron gives the mass number.

5 0
3 years ago
Other questions:
  • In the following reaction, how many grams of nitroglycerin c3h5(no3)3 will decompose to give 25 grams of co2?4c3h5(no3)3(l) 12co
    9·1 answer
  • The natural source of acidity in rain water is _____.
    12·2 answers
  • 1. Working in the laboratory, a student find the density of a piece of pure aluminum to be 2.85
    7·1 answer
  • Jewelry and tableware are sometimes made of sterling silver. Sterling silver is 92.5% silver (Ag) and 7.5% copper (Cu). If you w
    11·1 answer
  • A chemist adds of a potassium permanganate solution to a reaction flask. Calculate the mass in grams of potassium permanganate t
    13·1 answer
  • What is catenation ​
    9·2 answers
  • A sample of Xe gas is observed to effuse through a pourous barrier in 4.83 minutes. Under the same conditions, the same number o
    11·1 answer
  • HELPPPPP PLZZZ ASAPPPPPPPP
    15·1 answer
  • ?!!??!!!!!!!!!!!!!HELPPPPPPPPP
    11·2 answers
  • the carbon canisters are about the size of a 55-gallon drum, how often would replacement be required?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!