What type of change goes on inside when a glow stick is activated?Chemical
Physical
Both
Answers
Answer:
Chemical
Explanation:
Related Questions
The following reaction does not proceed to a product: H2O + Ag --> no reaction. Why is that?A) The reaction proceeds too slowly too create products.B) The reaction cannot occur because water is reactant.C) Silver has a higher activity than hydrogen and cannot replace it.D) Silver has a lower activity than hydrogen and cannot replace it.
A 10.35g piece of copper metal was heated to 85.5 degrees C and then placed into 23.6g of water. the initial temperate of the water was 18.3 degrees C. what was the final temperature?
Solutions are a mixture of 2 or more compounds true or false
The process of seeking facts that will lead to the truth is called _____.a. studyb. researchc. intuition
Answers
Answer : The percent yield of is, 68.4 %
Solution : Given,
Mass of = 0.16 g
Mass of = 0.84 g
Molar mass of = 16 g/mole
Molar mass of = 32 g/mole
Molar mass of = 44 g/mole
First we have to calculate the moles of and
.
Now we have to calculate the limiting and excess reagent.
The balanced chemical reaction is,
From the balanced reaction we conclude that
As, 2 mole of react with 1 mole of
So, 0.026 moles of react with
moles of
From this we conclude that, is an excess reagent because the given moles are greater than the required moles and
is a limiting reagent and it limits the formation of product.
Now we have to calculate the moles of
From the reaction, we conclude that
As, 2 mole of react to give 1 mole of
So, 0.026 moles of react to give
moles of
Now we have to calculate the mass of
Theoretical yield of = 0.572 g
Experimental yield of = 0.391 g
Now we have to calculate the percent yield of
Therefore, the percent yield of is, 68.4 %
Answers
Answers
Answer:- 0.80 moles
Solution:- Number of atoms of tungsten are given and we are asked to calculate the moles of tungsten atoms. So, it is a atom to mole conversion and for this we use the Avogadro number.
Number of atoms are divided by Avogadro number to get the number of moles.
Avogadro number is . Given number of atoms is
. let's divide it by Avogadro number.
Numerator and denominator has equal exponent so it is canceled. So, we only need to divide 4.8 by 6.022 and round the answer to two sig figs as given number of atoms has only two sig figs.
= 0.80 moles
Hence, there are 0.80 moles of tungsten atoms in given number of atoms.
Answers
Answer : The heat released by the eater is, [/tex]
Explanation :
Formula used :
or,
where,
Q = heat released = ?
m = mass of water = 200 g
c = specific heat of water =
= initial temperature =
= final temperature =
Now put all the given value in the above formula, we get:
[/tex]
Therefore, the heat released by the eater is, [/tex]
Heat Energy= Mass of substance X Specific Heat X Change in Temp.
1. change in temp |50-25| = 25
2. specific heat of Water(H2O) = cal/g (Celsius) 1.000
heat energy= 200g X 1.000 X 25
Heat energy = 5000cal
Answers
Answer: In the following equation, is considered as a binary compound.
Explanation: A binary compound is considered as a compound having 2 elements only. In the following chemical equation:
There are 2 compounds present because compound is defined as the chemical combination of two or more elements in a fixed ratio.
In the equation, compounds are: and
consists of 2 elements which are hydrogen and oxygen and hence is considered as a binary compound.
consists of 3 elements which are sodium, hydrogen and oxygen and hence, cannot be considered as a binary compound.
Define Electricity along with an example.
Answers
Answer:
Conservation of Charge is the principle that the total electric charge in an isolated system never changes. The net quantity of electric charge, the amount of positive charge minus the amount of negative charge in the universe, is always conserved.