A chemist is studying a substance and concludes that it is a pure substance. What MUST be true about the substance?AIt occurs naturally.BIt is synthetic.CIt is harmless to humans.DIt is an element or compound.
Question
A chemist is studying a substance and concludes that it is a pure substance. What MUST be true about the substance?AIt occurs naturally.BIt is synthetic.CIt is harmless to humans.DIt is an element or compound.
Solution
The substance must be an element or compound. This is because a pure substance in chemistry refers to substances that are made of only one type of atom or molecule. Therefore, it can either be an element, which consists of one type of atom, or a compound, which consists of molecules that are a combination of two or more different types of atoms. The other options do not necessarily have to be true for a substance to be considered pure. It does not have to occur naturally, as it can also be synthesized in a lab. It also does not have to be harmless to humans, as there are many pure substances that are harmful or toxic.
Similar Questions
A chemist takes four samples of a substance. Each sample has a different flammability. What can the chemist conclude about the substance?AIt is made by humans.BIt occurs naturally on Earth.CIt contains rare elements.DIt is not a pure substance.
Why is lead a pure substance?AIt is composed of many different substances.BIt can be separated by different chemical processes.CIt has a chemical composition that is not fixed.DIt is an element that is naturally occurring in nature.
What do you mean by a pure substance?
By definition, a Pure Substance isGroup of answer choicesa mineral that is 100% pure (does not contain even a trace of impurities)a chemical extract from a plant or animal that has been purified in a laboratoryan element or a compound that may exist as a gas, liquid or solida pure crystalline, naturally occurring solid
What is true of a mixture?AIt is always thicker than the two chemicals that go into itBIt retains the properties of the substances that make it upCIt can never be separated into its constituent substancesDIt is produced through chemical reactions
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