Chemistry, 06.12.2021 14:00 nkazmirski3229
Q5. A scientist is studying the reactions of the Group 1 and Group 2 elements.
A First, the scientist compares how quickly the Group 1 elements react.
He adds some lithium to water. At the same time, he starts a stopwatch.
He measures the time taken for the bubbles to stop. He does the same for some other Group 1 elements.
I State one safety precaution the scientist should take, apart from wearing eye protection, when conducting the reactions of the group 1 metals.
(1 mark) ii Suggest two things the scientist could do to make the test fair. (1 mark) iii The scientist records their results in a table. In the table, the elements are listed in the same order as they are in the periodic table
. Element Time for bubbles to stop (s) lithium 122 sodium 80 potassium 61 Describe the pattern in the results, going down Group 1 from lithium to potassium.
(1 mark) b Next, the scientist adds some Group 2 elements to water. He writes his results in a table. In the table, the elements are listed in the same order as they are in the Periodic Table. Group 2 element Observations when added to cold water magnesium small bubbles form on surface of magnesium calcium bubbles vigorously strontium barium bubbles extremely vigorously i Predict what he will observe when he adds strontium to water. (1 mark) ii Give a reason for your prediction. (1 mark) Maximum 5 marks
Answers: 3
Chemistry, 22.06.2019 05:50
Astudent made a graph plotting the progress of a reaction over time. the student forgot to label the y-axis of the graph. a graph is shown with two graph lines. one graph line starts at a higher position on the y axis and slopes downwards towards the right. the other graph line starts at a lower position on the y axis and slopes upwards towards the right. the two graph lines stop short of intersecting each other and continue as separate lines which gradually become straight and parallel to the x axis. a vertical line is shown at a point where the two graph lines finally became parallel to the x axis. this vertical line is labeled equilibrium. the title on the x axis is time and an arrow pointing towards the right is shown above time. the title on the y axis is left blank. what best explains the label that the student should use on the y-axis? amount, because as the amount of product decreases, the amount of reactant increases over time. reaction rate, because forward and backward reaction become equal at equilibrium. amount, because the amounts of reactants and products become constant after equilibrium is reached. reaction rate, as the rate of forward reaction increases and rate of backward reaction decreases over time.
Answers: 3
Chemistry, 22.06.2019 07:00
At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure
Answers: 2
Q5. A scientist is studying the reactions of the Group 1 and Group 2 elements.
A First, the scient...
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