Chemical Reactions Lab 5.3.12
- Chemical Reactions require energy
-The energy is used to break the chemical bonds of the starting substances (the reactants) so that new substances are formed (the products)
- A chemical formula tells you how many atoms of each element are found within each substance
- The number of atoms within that molecule are shown by a subscript which is found after each elemental symbol
- If there is no subscript after the atom, then there is only ONE atom of that element in the substance
-The energy is used to break the chemical bonds of the starting substances (the reactants) so that new substances are formed (the products)
- A chemical formula tells you how many atoms of each element are found within each substance
- The number of atoms within that molecule are shown by a subscript which is found after each elemental symbol
- If there is no subscript after the atom, then there is only ONE atom of that element in the substance
-In this equation, hydrogen (H2) and oxygen (O2) react to form water (H2O).
-The reactants are hydrogen and oxygen, which is detected in blue. The product is water, which is detected in red.
-H2 is the chemical formula for hydrogen. The subscript 2 after the H means that two atoms of hydrogen are bonded together.
-O2 is the chemical formula for oxygen. The subscript 2 after the O means that two atoms of oxygen are bonded together.
-H2O is the chemical formula for water. The subscript 2 after the H means that two atoms of hydrogen are bonded to one oxygen atom.
Part 1: How do Chemical Reactions Work?
1. What are the starting substances (molecules) in a chemical equation called?
2. What are the final or new substances (molecules) in a chemical equation called?
3. In your own words, describe what happens to the hydrogen and oxygen molecules when creating water. Something must be re-combined. How does this happen?
Part 2: Chemical Formulas
1. How many chemical formulas are you using in the group? State your group number and the chemical formula (state both if more than one).
We are group 3 and the equation is H2CO3
2. What does a chemical formula represent? In other words, what type of information is found within a chemical formula?
It tells you how many atoms of each element are found in each substance and where molecules are formed.
3. How many copper (Cu) atoms are there in the chemical formula CuO?
There is one atom of copper in that equation.
4. How many oxygen (O) are there in the chemical formula KClO4?
There four oxygen atoms in that equation.
5. How many hydrogen atoms (H) are there in the chemical formula H.2CO3?
There are two hydrogen atoms.
6. How many hydrogen (H) and nitrogen (N) atoms are there in the chemical formulas for group 4? H2N2
-The reactants are hydrogen and oxygen, which is detected in blue. The product is water, which is detected in red.
-H2 is the chemical formula for hydrogen. The subscript 2 after the H means that two atoms of hydrogen are bonded together.
-O2 is the chemical formula for oxygen. The subscript 2 after the O means that two atoms of oxygen are bonded together.
-H2O is the chemical formula for water. The subscript 2 after the H means that two atoms of hydrogen are bonded to one oxygen atom.
Part 1: How do Chemical Reactions Work?
1. What are the starting substances (molecules) in a chemical equation called?
2. What are the final or new substances (molecules) in a chemical equation called?
3. In your own words, describe what happens to the hydrogen and oxygen molecules when creating water. Something must be re-combined. How does this happen?
Part 2: Chemical Formulas
1. How many chemical formulas are you using in the group? State your group number and the chemical formula (state both if more than one).
We are group 3 and the equation is H2CO3
2. What does a chemical formula represent? In other words, what type of information is found within a chemical formula?
It tells you how many atoms of each element are found in each substance and where molecules are formed.
3. How many copper (Cu) atoms are there in the chemical formula CuO?
There is one atom of copper in that equation.
4. How many oxygen (O) are there in the chemical formula KClO4?
There four oxygen atoms in that equation.
5. How many hydrogen atoms (H) are there in the chemical formula H.2CO3?
There are two hydrogen atoms.
6. How many hydrogen (H) and nitrogen (N) atoms are there in the chemical formulas for group 4? H2N2