Question

Write T for true and F for false. 1. A pure substance has fixed composition and fixed chemical properties. 2. Graphite and iodine are non-lustrous non-metals. 3. Metals are non-ductile, non-malleable, and sonorous. 4. Hydrogen, being a non-metal, has high melting and boiling points. 5. Atoms are the smallest particle of matter that join to form larger particles called molecules.​

Answer 1

Answer:

Write T for true and F for false.

1. A pure substance has fixed composition and fixed chemical properties.

2. Graphite and iodine are non-lustrous non-metals.

3. Metals are non-ductile, non-malleable, and sonorous.

4. Hydrogen, being a non-metal, has high melting and boiling points.

5. Atoms are the smallest particle of matter that join to form larger particles called molecules.

Explanation

1. A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen. A pure substance does not have to be of a single element or compound

2. Graphite is also a non-metal which has metallic lusture. Metallic luster is due to presence of free electrons in them generally non metals don't exhibit this property, but iodine and graphite are non metals they exhibit metallic luster.

3. Non-metals are not malleable. Metals are good conductors of heat and electricity. Metals are ductile, i.e. they can be drawn into thin wires. ... Metals are sonorous, i.e. they produce a typical metallic sound when hit with something.

4. Diamond and Graphite has more melting and boiling points. Because they are the substances with giant covalent structures have very high melting points, because a lot of strong covalent bonds must be broken. 

5. An atom is the smallest particle of an element, having the same chemical properties as the bulk element. The first accurate theory explaining the nature of matter was Dalton's Atomic Theory: 1. All matter is composed of atoms, and atoms are indivisible and indestructible.

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Answer 2

1. False.

2. False

3. True.

4. False.

5. False.

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