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a_sh-v [17]
3 years ago
11

Which 2 diagrams show suitable methods for investigating the speed of the reaction

Chemistry
1 answer:
7nadin3 [17]3 years ago
3 0
I would say D: 2 and 4.

The first line of the question is very important. X reacts with Y to form a gas.

For 2, we let the gas escape and measure the change in mass during the reaction.

For 4, we capture the change in volume of gas during the reaction.

1 does not work: some of the gas escapes through the cotton and the gas captured is not recorded correctly.

3 does not work: the gas is trapped and the mass balance does not record a change in mass.
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Answer:

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Data:

\begin{array}{rcrrcl}p_{1}& =& \text{123.5 kPa}\qquad & V_{1} &= & \text{25 L} \\p_{2}& =& \text{179.9 kPa}\qquad & V_{2} &= & ?\\\end{array}

Calculations:  

\begin{array}{rcl}123.5 \times 25 & =& 179.9V_{2}\\3088 & = & 179.9V_{2}\\V_{2} & = &\dfrac{3088}{179.9}\\\\& = &\textbf{17 L}\\\end{array}\\\text{The new volume of the gas is } \large \boxed{\textbf{17 L}}

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