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Andru [333]
3 years ago
7

The substances present before a chemical reaction takes place are called?

Chemistry
2 answers:
andrew11 [14]3 years ago
5 0
The substances present before the reaction are the reactants.  (As the reaction goes through, the substances that are produced are called the products of the reaction).
jeka57 [31]3 years ago
5 0
Reactants. just did the penn foster exam
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As a step O3 0.020 mol to gr
White raven [17]
Molar mass:

Atomic mass O = 16.0 a.m.u

O₃ = 16.0 x 3 => 48.0 g/mol

Therefore:

1 mole O₃ --------------- 48.0 g
0.020 mole O₃ ---------- ??

0.020 x 48.0 / 1 =

0.96 / 1 => 0.96 g 

hope this helps!
5 0
4 years ago
The gas in the piston is being heated, and the piston has moved upward. The observation will be summarized in a row of the incom
densk [106]

Answer:

2

Explanation:

8 0
3 years ago
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c. Propanol has the chemical formula C3H OH. Write and balance the chemical reaction for the combustion of propanol.​
Lilit [14]
Combustion reactions always contain products of CO + H2O with the addition of O2 (oxygen) in the reactant.

In this case it would be:

C3H7OH OR C3H8O (if you count up all the H’s)

We’re just going to use C3H7OH since that’s what you were given so it’ll be easier for you that way.


C3H7OH + O2 -> CO2 + H2O

Balanced:

2 C3H7OH + 9 O2 -> 6 CO2 + 8 H2O
5 0
3 years ago
Which statement is true for a cooling curve?
jok3333 [9.3K]
The best answer is A) <span>It shows how the temperature of the substance falls as heat is removed. 

The cooling curve shows how the temperature of a substances changes with time, as it is allowed to cool. The substance is first heated until completely liquefied, and then allowed to cool. The flat parts of the curve, where temperature is constant with time, show the periods in which the state of matter of the substance changes. One the substance completely changes it state of matter, namely changes from liquid to solid, its temperature continues to drop. 
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</span>
4 0
4 years ago
Read 2 more answers
What is the Brønsted-Lowry base in this reaction: NH2−+CH3OH→NH3+CH3O−?(1 point)
Viefleur [7K]

The Brønsted-Lowry base in the given reaction is NH₂⁻. The correct option is the fourth option NH2−

To determine which is the Brønsted-Lowry base in the given reaction:

NH2−+CH3OH→NH3+CH3O−

First, we will write the equation for the reaction properly

The equation is:

NH₂⁻ + CH₃OH  → NH₃ + CH₃O⁻

Now, to determine which among the species in the above reaction is the Brønsted-Lowry base, we will start by defining what a <em>Brønsted-Lowry base</em><em> </em>is.

A Brønsted-Lowry base is any species that is capable of accepting a proton, which requires a lone pair of electrons to bond to the H⁺.

In simple terms, a Brønsted-Lowry base is a proton acceptor.

In the above reaction, NH₂⁻ is the species that is capable of accepting a proton and it has a lone pair of electrons to bond to the H⁺.

∴ NH₂⁻ is the Brønsted-Lowry base in the reaction

Hence, the Brønsted-Lowry base in the given reaction is NH₂⁻. The correct option is the fourth option NH2−

Learn more here: brainly.com/question/13017688

7 0
3 years ago
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