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
Lubov Fominskaja [6]
3 years ago
8

How do you know if a reaction is exothermic

Chemistry
2 answers:
melisa1 [442]3 years ago
7 0
When there is heat released
UNO [17]3 years ago
6 0
When heat is released 
You might be interested in
What is the molecular formula of a compound with the empirical formula
ipn [44]

Answer:  C_2H_2O_2

Explanation:

Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.  

Empirical formula is the simplest chemical formula which depicts the whole number of atoms of each element present in the compound.

The empirical formula is CHO

The empirical weight of CHO = 1(12)+1(1)+1(16)= 29 g.

The molecular weight = 60 g/mole

Now we have to calculate the molecular formula:

n=\frac{\text{Molecular weight}}{\text{Equivalent weight}}=\frac{60}{29}=2

The molecular formula will be=2\times CHO=C_2H_2O_2

Thus molecular formula will be C_2H_2O_2

5 0
3 years ago
16. Explain why antifreeze is used in vehicle radiators. Use your knowledge of the properties of
Fynjy0 [20]

Answer:

Antifreeze is whats used to keep your engine cool without freezing.

Explanation:

it keeps the engine from overheating.

It also prevents corrosion.

Here is a quote from google "Antifreeze works because the freezing and boiling points of liquids are “colligative” properties. This means they depend on the concentrations of “solutes,” or dissolved substances, in the solution. A pure solution freezes because the lower temperatures cause the molecules to slow down"

That quote is from "The Science Behind Antifreeze"

If you have any questions feel free to ask in the comments.

4 0
3 years ago
Mass is the measure of the amount of ___ in an object.
Kamila [148]

Answer:

mass is the measure of the amount of weight pulled by gravity in an object B-)

5 0
2 years ago
H20 (s) -&gt; h20 (g)<br> endothermic or exothermic
noname [10]

Answer:

Endothermic.

Explanation:

Hello there!

In this case, it is necessary to keep in mind that exothermic processes are characterized by the release of energy and the endothermic processes by the absorption of heat. In such a way, every process from solid to liquid or gas is endothermic as they require energy to separate the molecules and therefore turn out in the phase change. On the other hand, every process from gas to liquid or solid is exothermic as heat is released to rejoin the molecules and produce the phase change.

Therefore, since solid water molecules tend to be well-arranged, it is necessary to add heat to the system to produce the phase change until gas; in such a way, this process is endothermic as energy must be absorbed by the ice.

Best regards!

3 0
3 years ago
Given 9.0 moles of O2, how many grams of H2O can be produced ?
Anastasy [175]

Answer:

If we have one mole of water, then we know that it will have a mass of 2 grams (for 2 moles of H atoms) + 16 grams (for one mole O atom) = 18 grams.

Explanation:

5 0
3 years ago
Other questions:
  • The net ionic equation for the reaction between aqueous sulfuric acid and aqueous sodium hydroxide is ________.
    15·1 answer
  • How could you cause a chemical change in vinegar
    12·1 answer
  • In a generator, the current changes direction each time the ____ passes the _____ of a magnet.
    14·2 answers
  • How might the information on melting point, boiling point, and flammability be useful to materials scientists
    12·1 answer
  • What the the compound formula of Fe2+ + N3- ?
    7·1 answer
  • A cold object will have_ kinetic energy which means _ faster moving particles
    15·1 answer
  • How do you figure out molality
    11·1 answer
  • You are using a ruler to measure the width of a test tube. The edge of the test tube is between 3 cm and 4 cm marks. if centimet
    7·1 answer
  • A woman has a body mass of 53 kg. What is her mass in grams?
    6·2 answers
  • Atoms of what class of elements are used to absorb electrons in electron-dense stains?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!