1. which of the following postulates from Dalton\'s atomic theory was omitted be

Question

1. which of the following postulates from Dalton's atomic theory was omitted because of the later discovery of radioactive elements? a. all matter is made up of very small particles call atom. b. atoms are indivisible and indestructable c. chemical reactions involve rearrangement of atoms d. compounds are formed from atoms.

2. Which bond has the most covalent character? a. Na- F b. P-Cl c. Cs-Cl d. Ca- S

3. Predict the bond formed between phosphorus and iodine. a. nonpolar covalent. b. polar covalent. c. ionic. d. metallic.

4. Gamma rays can be stopped by a. a sheet of paper. b. a thin aluminum sheet c. a block of wood. d. several centimeters of lead.

5. In nuclear fusion, a. large unstable nuclei are fused together, and then split with the release of binding energy. b. large, relatively unstable nuclei are split
releasing binding energy. c. small, relatively stable, nuclei are split releasing binding energy.

6. Ozone is destroyed by two natural processes. Which naturally ocurring substances cause this destruction? a. UV-B, UV- A b. nitric oxide, hydroxyl radical. c. chlorine, carbon dioxide. d. both a and c are correct.

Explanation / Answer

1) answer: b. atoms are indivisible and indestructable

explanation :

atoms are divisible . atoms contain proton,neutron and electrons. so this is omitted by Dalton's model

2) answer : b ) P -Cl

explanation:

P and Cl electronegativity difference is very lesser so this is most covalent character bond

3) answer : b. polar covalent.

explanation : P and I are different electronegative atoms . so there is polar covalent bond formed between these two .

4) answer : a thin aluminum sheet

5) answer : a. large unstable nuclei are fused together

6) answer : b. nitric oxide, hydroxyl radical.

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