The state (phase) of the compounds can be expressed in the chemical equation. This is done by placing the correct label on the right hand side of the formula. There are only four labels that can be used:
(g) for gaseous compounds
(l) for liquids
(s) for solid compounds
(aq) for an aqueous (water) solution
To show that heat is needed for a reaction, a Greek delta (
) is placed above the arrow.
You may remember from
Physical and chemical change that energy cannot be created or destroyed during a chemical reaction but it may change form. In an exothermic reaction,
H is less than zero and in an endothermic reaction,
H is greater than zero. This value is often written at the end of a chemical equation.
Solid zinc metal reacts with aqueous hydrochloric acid to form an aqueous solution of zinc chloride (
)and hydrogen gas. Write a balanced equation for this reaction.
The reactants are zinc (
) and hydrochloric acid (
). The products are zinc chloride (
) and hydrogen (
).
You will notice that the zinc atoms balance but the chlorine and hydrogen atoms don't. Since there are two chlorine atoms on the right and only one on the left, we will give
a coefficient of 2 so that there will be two chlorine atoms on each side of the equation.
When you look at the equation again, you will see that all the atoms are now balanced.
In the initial description, you were told that zinc was a metal, hydrochloric acid and zinc chloride were in aqueous solutions and hydrogen was a gas.
Balance the following equation:
In this example, the first two steps are not necessary because the reactants and products have already been given.
With a complex equation, it is always best to start with atoms that appear only once on each side i.e.
,
and
atoms. Since the
atoms already balance, we will start with
and
atoms. There are two
atoms on the right and one on the left. We will add a second
atom by giving
a coefficient of two. There are two
atoms on the left and one on the right. To balance the
atoms,
will be given a coefficient of two. The equation now looks as follows:
,
and
atoms balance, but
and
atoms do not. There are six
atoms and ten
atoms on the left, and five
atoms and eight
atoms on the right. We need to add one
atom and two
atoms on the right to balance the equation. This is done by adding another
molecule on the right hand side. We now need to check the equation again:
The equation is now balanced.
The following video explains some of the concepts of balancing chemical equations.
The lymphatic system plays several crucial roles in the human body, functioning as a key component of the immune system and contributing to the maintenance of fluid balance. Its main functions include:
1. Immune Response: The lymphatic system produces and transports lymphocytes, which are a type of
asegid
to transport fluids fats proteins and lymphocytes to the blood stream as lymph
Anatomy is the study of the structure of the body, while physiology is the study of the function of the body. Anatomy looks at the body's organs and systems, while physiology looks at how those organs and systems work together to keep the body functioning.
Enzymes are proteins that help speed up chemical reactions in our bodies. Enzymes are essential for digestion, liver function and much more. Too much or too little of a certain enzyme can cause health problems
Kamara
yes
Prince
how does the stomach protect itself from the damaging effects of HCl
the normal temperature is 37°c or 98.6 °Fahrenheit is important for maintaining the homeostasis in the body
the body regular this temperature through the process called thermoregulation which involves brain skin muscle and other organ working together to maintain stable internal temperature