June 2017  Chemistry Regents #46-50

Highlight to reveal answers and explanations

 

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 54-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-76  Questions 77-80  Questions 81-82  Questions 83-85 

Other Regents Exams

 

Questions

AnswerLinks

Explanations

46 What is the mass of an original 5.60-gram sample of iron-53 that remains unchanged after 25.53 minutes?

 (1) 0.35g     (3) 1.40 g

 (2) 0.70 g    (4) 2.80 g

2linktable N..half life is 8.51 min

25.53 min/8.51  min= 3 half lives

5.60g-->2.80g-->1.40g-->0.70g

47 Given the equation representing a nuclear reaction:

1H   +  X==>6Li  +4He
132
The particle represented by X is
(1)

 

9Li
4
(3)
10Be
5
(2)
9Be
4
(4)
10C
6
2linkfind the missing piece 

mass in equals mass out

atomic numbers in equal atomic numbers out

atomic number determines the element

48 Fission and fusion reactions both release energy,. However, only fusion reactions

(1) require elements with large atomic numbers

(2) create radioactive products

(3) use radioactive reactants

(4) combine light nuclei

4linkfusion combine 2 small nuclei...usually hydrogen to make helium

 

 

49 The chart below shows the crystal shapes and melting points of two forms of solid phosphorus

Which phrase describes the two forms of phosphorus?

(l) same crystal structure and same properties

(2) same crystal structure and different properties

(3) different crystal structures and different properties

(4) different crystal structures and same properties

3linkdifferent is different

allotropes same element different forms, different properties

50 Which graph shows the relationship between pressure and Kelvin temperature for an ideal gas at constant volume?

1linkin a seal container, if you heat it the pressure will increase....until it explodes

 

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 54-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-76  Questions 77-80  Questions 81-82  Questions 83-85 

Back to Regents Exams