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3 years ago

How to balance an equation?

2 answers:

8 0

Do you mean a chemical equation? If so you balance it by adding coefficients. (The subscripts shouldn't change, nor the products or reactants)
Let's say you have (reactant side) H2 + O2 ----> H2O (product side)

To balance the equation count the atoms in products and reactants.
There are 2 hydrogen atoms on both sides, so they are balanced, but the oxygen atoms aren't. To make it balanced, we can add a 2 in front of H2O
H2 + O2-------> 2H2O (4 hydrogen atoms, 2 oxygen atoms).

Now we need to adjust the reactant side since there are 4 hydrogen on the product side. We can do this by adding a 4 in front of the H2:
2H2+O2-----> 2H2O

This is a balanced eqation: reactant side: 4 hydrogen, 2 oxygen
product side: 4 hydrogen, 2 oxygen

vova2212 [387]3 years ago

3 0

To balance an equation, you do whatever you did on one side, on the other side. If you subtract, then you subtract on the other side. If you multiply, you multiply on the other side, etc...

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Shtirlitz [24]

Answer:

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Explanation:

Part D) two expressions are indicated

3C + 4D = 5

2C +5 D = 2

let's simplify each expression

3C + 4D = 5

4D = 5 - 3C

we divide by 4

D = $\frac{5}{4} - \frac{3}{4} \ C$

The other expression

2C +5 D = 2

2C = 2 - 5D

C = $1 - \frac{5}{2} \ D$

we can see that the correct result is 1

Part E.

It is asked to solve the problem by the substitution method, we already have

D = $\frac{5}{4} - \frac{3}{4} \ C$

we substitute in the other equation

2C +5 D = 2

2C +5 (5/4 - ¾ C) = 2

we solve

C (2 - 15/4) + 25/4 = 2

-7 / 4 C = 2 - 25/4

-7 / 4 C = -17/4

7C = 17

C = $\frac{17}{7}$

now we calculate D

D = $\frac{5}{4} - \frac{3}{4} \ \frac{17}{7}$

D = 5/4 - 51/28

D = $\frac{35-51}{28}$

D = - 16/28

D = $- \frac{4}{7}$

the result is (C, D) = ( $\frac{17}{7}, \ \frac{-4}{7}$ )

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3 years ago

The atoms ,molecules,or compound present at the start of a chemical reaction that parcitipate in the reaction . which part of a

Tomtit [17]

Answer:

The atoms ,molecules, or compound present at the start of a chemical reaction that parcitipate in the reaction are the reactants.

Explanation:

The chemical reaction is the way in which one substance reacts against another. So, a chemical reaction consists of the transformation of some substances into others, that is, the process of arranging atoms and bonds when chemical substances come into contact.

In a chemical reaction, the initial substances are called reactants, while the new substances obtained are called products.

So, the atoms ,molecules, or compound present at the start of a chemical reaction that parcitipate in the reaction are the reactants.

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Answer:

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Explanation:

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