Can I have an example of both a chemical and physical change happening at the same time. It can’t be a burning candle, burning wood, or food chewing and digestion.

The definition of solubility is the maximum quantity of solute that can dissolve in a certain quantity of solvent or quantity of solution at a specified temperature or pressure (in the case of gaseous solutes). For Gases, solubility decreases as temperature increases (duh...you have seen water boil, right?) The physical reason for this is that when most gases dissolve in solution, the process is exothermic. This means that heat is released as the gas dissolves. This is very similar to the reason that vapor pressure increases with temperature. Increased temperature causes an increase in kinetic energy. The higher kinetic energy causes more motion in the gas molecules which break intermolecular bonds and escape from solution. Do you need any more?

Answer:

By comparing the traits of other species to that of an undefined species. Even if it is a new species, it can be classified under a specific species type through dichotomous keys.

Answer:

B

Explanation:

Atoms are those particles which cannot be broken down further. But, later on the subatomic particles were discovered

Final answer:

John Dalton's Atomic Theory states that atoms are indivisible and cannot be broken down further. They combine to form molecules and are not all composed of carbon. Atoms do have mass.

Explanation:

John Dalton, an English chemist, is famous for his theory of atomic structure, also known as Dalton's Atomic Theory. According to this theory, atoms are the tiniest particles of matter which cannot be divided or broken down further into simpler substances by chemical means. Thus, the correct answer to the question would be (b) - atoms cannot be broken down further.

Atoms can combine in various proportions to form molecules, but they themselves do not contain molecules. Also, not all atoms are composed of carbon, there are many other elements such as hydrogen, oxygen, nitrogen, to name a few. Finally, atoms do possess mass, it is one of their fundamental properties.

Learn more about Dalton's Atomic Theory here:

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Answer:

Example:

0.0001 = 1 x 10-4

you can you 0 for applying weight or volume

Answer:

Expressed in kilograms, the mass of 0.098kg should still have two important digits. 0 is essential because if you don't use the zero after the decimal point then you will be using the incorrect measurement.

Hope this helps.

- Que