Answer:
To verify you have a pure sample use the sterile needle to isolate and grow on a new streak plate to make sure you see only one culture.
Explanation:
Answer:
Adding sodium to chlorine gas will produce table salt. The formation of a new substance shows that both physical and chemical change occurred.
Explanation:
The major reason why it has to be both physical and chemical is because there are some physical features that would change such as weight, appearance, color among others while the chemical properties would have changed immediately the addition occur
If we are talking about one single carbon atom, then 4 hydrogen atoms can be bonded to a carbon atom, because there is 4 electrons in the valence shell, and a valence shell needs 8 electrons in total, which causes the carbon to have 4 open bonds. A hydrogen has only one electron in its valence shell of 2, and needs one more to complete it. So, each hydrogen connects to 1 of 4 bonds on the carbon to complete the valence electron.
Fun fact, CH4 is methane.
