When balancing a chemical equation, there are a number of steps that need to be followed.
STEP 1: Identify the reactants and the products in the reaction and write their chemical formulae.
STEP 2: Write the equation by putting the reactants on the left of the arrow and the products on the right.
STEP 3: Count the number of atoms of each element in the reactants and the number of atoms of each element in the products.
STEP 4: If the equation is not balanced, change the coefficients of the molecules until the number of atoms of each element on either side of the equation balance.
STEP 5: Check that the atoms are in fact balanced.
STEP 6 (we will look at this a little later): Add any extra details to the equation e.g. phase.
Balance the following equation:
Mg + HCl
MgCl
2 + H
2
Reactants: Mg = 1 atom; H = 1 atom and Cl = 1 atom
Products: Mg = 1 atom; H = 2 atoms and Cl = 2 atoms
The equation is not balanced since there are 2 chlorine atoms in the product and only 1 in the reactants. If we add a coefficient of 2 to the HCl to increase the number of H and Cl atoms in the reactants, the equation will look like this:
Mg + 2HCl
MgCl
2 + H
2
If we count the atoms on each side of the equation, we find the following:
If we add a coefficient of 2 to H
O, then the number of hydrogen atoms in the reactants will be 4, which is the same as for the reactants. The equation will be:
CH
4 + O
2
CO
2 + 2H
2 O
Reactants: C = 1; H = 4; O = 2
Products: C = 1; H = 4; O = 4
You will see that, although the number of
hydrogen atoms now balances, there are more oxygen atoms in the products. You now need to repeat the previous step. If we put a coefficient of 2 in front of O
, then we will increase the number of oxygen atoms in the reactants by 2. The new equation is:
CH
4 + 2O
2
CO
2 + 2H
2 O
When we check the number of atoms again, we find that the number of atoms of each element in the reactants is the same as the number in the products. The equation is now balanced.
Nitrogen gas reacts with hydrogen gas to form ammonia. Write a balanced chemical equation for this reaction.
The reactants are nitrogen (N
) and hydrogen (H
) and the product is ammonia (NH
).
The equation is as follows:
N
2 + H
2
NH
3
Reactants: N = 2; H = 2
Products: N = 1; H = 3
In order to balance the number of nitrogen atoms, we could rewrite the equation as:
N
2 + H
2
2NH
3
In the above equation, the nitrogen atoms now balance, but the hydrogen atoms don't (there are 2 hydrogen atoms in the reactants and 6 in the product). If we put a coefficient of 3 in front of the hydrogen (H
), then the hydrogen atoms and the nitrogen atoms balance. The final equation is:
In our bodies, sugar (C
6 H
12 O
6 ) reacts with the oxygen we breathe in to produce carbon dioxide, water and energy. Write the balanced equation for this reaction.
Reactants: sugar (C
6 H
12 O
6 ) and oxygen (O
2 )
Products: carbon dioxide (CO
2 ) and water (H
2 O)
C
6 H
12 O
6 + O
2
CO
2 + H
2 O
Reactants: C=6; H=12; O=8;
Products: C=1; H=2; O=3;
It is easier to start with carbon as it only appears once on each side. If we add a 6 in front of CO
2 , the equation looks like this:
C
6 H
12 O
6 + O
2
6CO
2 + H
2 O
Reactants: C=6; H=12; O=8;
Products: C=6; H=2; O=13;
Let's try to get the number of hydrogens the same this time.
Hydrogen fuel cells are extremely important in the development of alternative energy sources. Many of these cells work by reacting hydrogen and oxygen gases together to form water, a reaction which also produces electricity. Balance the following equation:
H
2 (g) + O
2 (g)
H
2 O(l)
The synthesis of ammonia (NH
), made famous by the German chemist Fritz Haber in the early 20th century, is one of the most important reactions in the chemical industry. Balance the following equation used to produce ammonia:
N
2 (g) + H
2 (g)
NH
3 (g)
Mg + P
4
Mg
3 P
2
Ca + H
2 O
Ca(OH)
2 + H
2
CuCO
3 + H
2 SO
4
CuSO
4 +
H
2 O + CO
2
CaCl
2 + Na
2 CO
3
CaCO
3 + NaCl
C
12 H
22 O
11 + O
2 + H
2 O
Barium chloride reacts with sulphuric acid to produce barium sulphate and hydrochloric acid.
Ethane (C
H
) reacts with oxygen to form carbon dioxide and steam.
Ammonium carbonate is often used as a smelling salt. Balance the following reaction for the decomposition of ammonium carbonate:
(NH
4 )
2 CO
3 (s)
NH
3 (aq) + CO
2 (g) + H
2 O(l)
Three charges q_{1}=+3\mu C, q_{2}=+6\mu C and q_{3}=+8\mu C are located at (2,0)m (0,0)m and (0,3) coordinates respectively. Find the magnitude and direction acted upon q_{2} by the two other charges.Draw the correct graphical illustration of the problem above showing the direction of all forces.
To solve this problem, we need to first find the net force acting on charge q_{2}. The magnitude of the force exerted by q_{1} on q_{2} is given by F=\frac{kq_{1}q_{2}}{r^{2}} where k is the Coulomb constant, q_{1} and q_{2} are the charges of the particles, and r is the distance between them.
Muhammed
What is the direction and net electric force on q_{1}= 5µC located at (0,4)r due to charges q_{2}=7mu located at (0,0)m and q_{3}=3\mu C located at (4,0)m?
Capacitor is a separation of opposite charges using an insulator of very small dimension between them. Capacitor is used for allowing an AC (alternating current) to pass while a DC (direct current) is blocked.
Gautam
A motor travelling at 72km/m on sighting a stop sign applying the breaks such that under constant deaccelerate in the meters of 50 metres what is the magnitude of the accelerate
velocity can be 72 km/h in question. 72 km/h=20 m/s, v^2=2.a.x , 20^2=2.a.50, a=4 m/s^2.
Mehmet
A boat travels due east at a speed of 40meter per seconds across a river flowing due south at 30meter per seconds. what is the resultant speed of the boat
which has a higher temperature, 1cup of boiling water or 1teapot of boiling water which can transfer more heat 1cup of boiling water or 1 teapot of boiling water explain your . answer
I believe temperature being an intensive property does not change for any amount of boiling water whereas heat being an extensive property changes with amount/size of the system.
Someone
Scratch that
Someone
temperature for any amount of water to boil at ntp is 100⁰C (it is a state function and and intensive property) and it depends both will give same amount of heat because the surface available for heat transfer is greater in case of the kettle as well as the heat stored in it but if you talk.....
Someone
about the amount of heat stored in the system then in that case since the mass of water in the kettle is greater so more energy is required to raise the temperature b/c more molecules of water are present in the kettle
pratica A on solution of hydro chloric acid,B is a solution containing 0.5000 mole ofsodium chlorid per dm³,put A in the burret and titrate 20.00 or 25.00cm³ portion of B using melting orange as the indicator. record the deside of your burret tabulate the burret reading and calculate the average volume of acid used?
No. According to Isac Newtons law. this two bodies maybe you and the wall beside you.
Attracting depends on the mass och each body and distance between them.
Dlovan
Are you really asking if two bodies have to be charged to be influenced by Coulombs Law?
Robert
like charges repel while unlike charges atttact
Raymond
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