Select the option that best completes the following sentence. Water is a compound because it is made up of:atomsatoms of only one element: hydrogenatoms of only one element: oxygenatoms of two elements, hydrogen and oxygen, mixed together but not chemically combinedatoms of two elements, hydrogen and oxygen, chemically combinedI'm not sure

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

Identify whether the following statement is true or false.There is only ever one way that two elements can combine to form a compound.Hint: Consider the compounds in the table above.TrueFalseI'm not sureQuestion 13SavedJustify your answer to the previous question by providing an example from the table.

There can be more than one way that two elements can combine to form a compound.

Which of the following is not a compound?Methane, CH4Carbon dioxide, CO2Hydrogen, H2Water, H2O

Select the definition of a compound.A mixture of atoms of different elements without bondingAn element containing two or more different types of atomsA substance formed from atoms of different elements bonded togetherAny substance made out of moleculesI'm not sure