A chemist adds 4 drops of hydrochloric acid to a beaker. What kind of number is "4" in this example? an exact number a measured number a number with one significant digit a significant number
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Part I
| an exact number |
| a measured number |
| a number with one significant digit |
| a significant number |
This is exact number. Because the number is obtained by counting.
Each drop is countable. So, 4 drops is obtained by visible and counted.
It is not measured number because each drop do not have same amount. It can not measurable.
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