Judge the following statements as true or false. If you believea statement to be false, provide a corrected version.(a) Air and water are both elements.(b) All mixtures contain at least one element and onecompound.(c) Compounds can be decomposed into two or more othersubstances; elements cannot.(d) Elements can exist in any of the three states of matter.(e) When yellow stains in a kitchen sink are treated withbleach water, the disappearance of the stains is due to aphysical change.(f) A hypothesis is more weakly supported by experimentalevidence than a theory.(g) The number 0.0033 has more significant figures than 0.033.(h) Conversion factors used in converting units always havea numerical value of one
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.
Judge the following statements as true or false. If you believe
a statement to be false, provide a corrected version.
(a) Air and water are both elements.
(b) All mixtures contain at least one element and one
compound.
(c) Compounds can be decomposed into two or more other
substances; elements cannot.
(d) Elements can exist in any of the three
(e) When yellow stains in a kitchen sink are treated with
bleach water, the disappearance of the stains is due to a
physical change.
(f) A hypothesis is more weakly supported by experimental
evidence than a theory.
(g) The number 0.0033 has more significant figures than 0.033.
(h) Conversion factors used in converting units always have
a numerical value of one
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