Shampoo tubes are hollow tubes so things can be stored or used as a conducter as it is metal.
<span>We have a sample of a gas which is a compound of carbon and oxygen. Chemical analysis shows that it contains 2.4 g of carbon and 6.4 g of oxygen. What is its formula?</span>
Answer:
A.
Explanation:
if it's the same element the protons will always be the same, but have different neutrons, and neutrons is made up of protons and atomic mass, which atomic mass numbers can be calculated different where in return gives different numbers of neutrons.
EX: say the element is carbon, carbon has 6 protons and that won't change, but carbon can have an atomic mass of 12, 13, or 14, etc. so when you make up the neutrons you add protons and atomic mass, 6 + 12 = 18 N
6 + 13 = 19 N
6 + 14 = 20 N
Yes, because they are in the same group also because they are similar with the <span>chemical properties</span>
<h3>Question :</h3>
Which of the following sources could not be used to obtain the DNA of a person lost in a mass disaster?
- used and unwashed clothing or bed sheets
- food found in the victim's refrigerator
- sunglasses regularly used by the person
- a toothbrush used by the person
<h3>Answer :</h3>
food found in the victim's refrigerator could not be used to obtain the DNA of a person lost in a mass disaster.
So, correct answer is 2nd one.
