In attempting to characterize a substance, a chemist makes the following observations;
(a) it is silvery-white with a metallic luster
(b) it melts at 649^oC and boils at 1105^oC
(c) it burns in air producing an intense white light
(d) it has a density of 1.78 at room temperature
(e) it reacts with water producing small bubbles of gas

Which of these characteristics are physical?

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Sixta KovacekLv2

30 Jul 2019

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In the process of attempting to characterize a substance, a chemist makes the following observations: The substance is a silvery white, lustrous metal. It melts at 649 °C and boils at 1105 °C. Its density at 20 °C is 1.738 g/cm³. The substance burns in air, producing an intense white light. It reacts with chlorine to give a brittle white solid. The substance can be pounded into thin sheets or drawn into wires. It is a good conductor of electricity. Which of these characteristics are physical properties, and which are chemical properties?

scarletsalmon259

What element they are:

1.My appearance at standard state is a silvery-white. My density when I melt is 1.46g/cm3. I burn purple, and react violently on contact with water. I see use in atomic clocks, and sometimes in glass

2.I am a diatomic molecule with a melting point of -259.14ËC and have a lower density than any other element.I am highly flammable and commonly form compounds with non-metals and halogens.I am commonly found in a product used to clean wounds and am one of the main elements involved in making stars shine

3.I am Silver-White in colour and I am so reactive I must be stored in oil.You may find me colouring glass windows in a church or reacting with water or acids to form hydrogen gas.I also oxidize and produce a film which tarnishes my Silver-White skin and can be used with other metals to form alloys

4.My soluble compounds are toxic to mammals yet I am used in paint, I am a soft but highly reactive metal. I am used in medical imaging but I am non-radioactive.

5.I am a poor conductor of heat or electricity, and my boiling point is at 536F.I am used as a fertilizer for soil and I help extinguish fire from common combustible, liquid, gas and electricity.

6.I get my name from the greek word meaning âmoonâ.I have 6 natural isotopes.I am protective against mercury poisoning, and my salt is used to control dandruff

7.I am a solid crystal yellow at room temperature. My melting point is , and I donât dissolve in water I react with most elements when heatedI am famous for burning in air and producing a blue flame.I prevent rubber materials from melting, as they get warmer. I am also used to treat acne

8.I am useful inside the body and outside the body I help heal wounds. My boiling point is 184 degrees and my name is derived from my colour. A crystalline solid that gives off a coloured gas on heating and can be found in most seaweed

9.My alloy will chill out cast iron and colour ceramics. I can strengthen lead or make acids more corrosive. Some of my amino acids are fun guys but can be harmful in large groups.

10.I'm part of the p block, my standard state is a solid.â¨I'm a post transition metal, I'm silvery white in colour.â¨When evaporated i can produce a mirror as reflective as silver, my name means violet.