Which of the following statements is not correct?A mixture consists of two or more elements or compounds not chemically combined togetherA compound contains two or more elements chemically combined in fixed proportionsAn element is a substance that is made from only one type of atomA pure substance is made up of a single element or compound mixed with water2Which of the following is not a pure substance?AirEthanolSodium chlorideWater3Which of the following describes a pure substance?Melts at specific and fixed temperature, boils over a range of temperaturesMelts and boils over a range of temperaturesBoils at specific and fixed temperature, melts over a range of temperaturesMelts and boils at specific and fixed temperatures
Question
Which of the following statements is not correct?A mixture consists of two or more elements or compounds not chemically combined togetherA compound contains two or more elements chemically combined in fixed proportionsAn element is a substance that is made from only one type of atomA pure substance is made up of a single element or compound mixed with water2Which of the following is not a pure substance?AirEthanolSodium chlorideWater3Which of the following describes a pure substance?Melts at specific and fixed temperature, boils over a range of temperaturesMelts and boils over a range of temperaturesBoils at specific and fixed temperature, melts over a range of temperaturesMelts and boils at specific and fixed temperatures
Solution
The incorrect statement is: "A pure substance is made up of a single element or compound mixed with water". A pure substance is made up of only one type of particle, either an element or a compound, and it is not mixed with anything else, including water.
The substance that is not pure among the options given is Air. Air is a mixture of several gases like nitrogen, oxygen, carbon dioxide, and others.
A pure substance is described as something that "Melts and boils at specific and fixed temperatures". This is because pure substances have specific melting and boiling points, unlike mixtures which melt and boil over a range of temperatures.
Similar Questions
Which of the following statements is true?A mixture has two types of particle chemically bonded together.A pure substance is made of two or more substances that are not chemically joined.You can change the proportion of substances in a mixture.
Which of the following is TRUE about a mixture?a.It is a classification under compounds.b.Its components are separated chemically.c.It does not have a fixed boiling point.d.It is one of the two types of pure substance.
Determine whether the following statement is true or false:A mixture is a combination of two or more substances in which no new substances are formed.
Which of the following is TRUE about a pure substance?a.It is always a solid or gas.b.It can be an element.c.It does not have a fixed boiling point.d.It is also called "homogeneous mixture".
What is a substance made up of two or more different types of atoms chemically combined in a fixed ratio called? MixtureSolutionElementCompound
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