Answer:
Percent error = -1%
Explanation:
Given data:
Accepted value = 200 cm
Experimental value = 198 cm
Percent error = ?
Solution:
Formula:
Percent error = [Experimental value - accepted value / accepted value]×100
Now we will put the values:
Percent error = [198 cm - 200 cm /200 cm] ×100
Percent error = -0.01×100
Percent error = -1%
Carbon dioxide (CO2) is a covalent compound because it is composed of carbon and oxygen. Herein both the elements i.e. C and O are non-metals.
These elements share the electrons. When electrons are shared, each
atom will contain 8 electrons in the outer shell. Due to this, all the atoms
of the CO2 will become stable and they will have a completed outer shell.
The lewis structure of CO2 is shown below:
Answer:
matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions.
Explanation:
Answer:
B. Secondary pollutant
Explanation:
A primary pollutant is directly emitted into the atmosphere. Volcano eruptions and emissions from cars can result in primary pollutants in the air.
Secondary pollutants are not directly put in the atmosphere. They are created when two or more primary pollutants in the atmosphere react. One example is smog.
Another example is acid rain. If sulphur dioxide, nitrogen dioxide and water react, then acid rain is formed. Therefore, acid rain must be a secondary pollutant.
The best answer choice is B. secondary pollutant