Answer:
D is correct. Atoms of the same element are the same
Explanation:
6. Which of the following statements is one of the postulates in Dalton's atomic theory?
A) All atoms are all the same.
B) Only some elements are composed of atoms.
C) Atoms of the same element are different.
D Atoms of the same element are identical.
D is correct. Atoms of the same element are the same
Atoms of different elements are different
when different atoms combine, they do this in simple ratios and form molecues which are the building block of compounds
The number of neutrons is determined from the difference of the atomic weight and atomic number. The atomic weight is 39 while the atomic number is 19. Thus, the number of neutrons is 20.
Answer:
a. A compound can be a pure substance.
b. A compound can be isolated.
Explanation:
a. A compound can be a pure substance.
This is because a compound which is made up of two or more atoms is also a pure substance since, a pure substance is a substance that contains only one type of matter - that is, it is in a single phase of matter.
Examples of compounds include water (H₂O) and ammonia (NH₃)
b. A compound can be isolated.
This is because, since it is a pure substance, it has unique properties which distinguish it from other compounds.
The total pressure of gases is equivalent to 739mmH divided by the area.
<h3>How to calculate the total pressure of gases?</h3>
To calculate the total pressure of gases, the next formula can be used:
- Total pressure: Force/area
- Total pressure 739 mmH/area
<h3>How to calculate the area?</h3>
The area of a cylinder is equal to 2πrh+2πr².
You can know the radio by checking the measurement of the base of the graduated cylinder. Also, you can determine the height by observing how many mm the gas is occupying. Then follow these steps:
- Find out the area based on the formula provided.
- Replace the area in the pressure formula.
- Solve the formula.
Note: This question is incomplete because the height occupied by the gas and the radio of the cylinder are not provided. Due to this, I answered this question based on general knowledge.
Learn more about cylinder in: brainly.com/question/3692256
Nal is the formula for sodium iodine
