Sterling silver is a combination of silver and copper. Silver and copper are each made up of only one type of stuff.Identify two correct statements.Silver and copper are pure substancesSilver and copper are mixturesSterling silver is a mixtureSterling silver is a pure substance

: Sterling silver is a combination of silver and copper. Silver and copper are each made up of only one type of stuff.Identify two correct statements.

Identify if gold metal is an example of a pure substance or a mixture. Pure substance1Mixture2

Silver is a precious metal often used to make jewellery.Sterling is the quality standard and is an alloy of 92.5% silver. The remainder is usually copper.Does this mean that silver jewellery is made of pure silver?Yes, because a pure substance is one that contains only one type of element or compound and the jewellery only contains silver.No, because a pure substance is one that contains only one type of element or compound. As the silver is mixed with copper to make jewellery, it is not pure.No, because a pure substance is one that contains two or more different elements or compounds and the jewellery only contains silver.Yes, because a pure substance is one that contains two or more different elements or compounds and the silver in jewellery contains different elements.

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

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.