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Questions

Explanations

(1) C₂H₄      (2) C₃H₈

(3) С₄Н₁₀    (4) С₅Н₁₂

not C_nH_2n+2

(1) I-131     (2) U-238

(3) Ca-37    (4) Fr-220

just memorize it

Which statement describes the energy of the particles in this sample during interval DE?

(1) Both potential energy and average kinetic energy increase.

(2) Both potential energy and average kinetic energy decrease.

(3) Potential energy increases and average kinetic energy remains the same.

(4) Potential energy remains the same and average kinetic energy increases.

Potential energy increases and average kinetic energy remains the same

Which intervals are affected by the addition of a catalyst?

(1) 1 and 2    (2) 1 and 3

(3) 2 and 4    (4) 3and 4

(1) Mg + Cl₂ ==> MgCl₂

(2) CaO + H₂O ==> Ca(OH)₂

(3) HNO₃ + NaOH ==> NaNO₃ + H₂O

(4) NaCl + AgNO₃ ==>AgCl + NaNO₃

Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Question 51-53 Questions 54-56
 Questions 57-61 Questions 62-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-82 Questions 83-85