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Taya2010 [7]
3 years ago
6

Which of the following is an example of velocity? Question 15 options: A plane travelling south towards the Bahamas. A man runni

ng 7 miles per hour west. A car sitting at a stop sign? A dog running at 5 miles per hour.
Chemistry
2 answers:
Rasek [7]3 years ago
7 0

Answer: A man running 7 miles per hour west.

Explanation: Vector quantity is a quantity which has both magnitude and direction.

Scalar quantity is a quantity which has only magnitude.

Velocity is a vector quantity which expresses the speed of the body along with the direction in which it is moving.

v=\frac{distance}{time}=\frac{miles}{hour}

Thus the correct option is A man running 7 miles per hour west.  

ad-work [718]3 years ago
6 0

Answer is: A man running 7 miles per hour west.

Velocity is equivalent to a specification of its speed and direction of motion, for example 100 km/h to the east.

Velocity is a physical vector quantity (measured in metres per second) and need magnitude and direction to define it, for example 100 metres per second east.

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<h2>Answer:</h2>

<em>8.67kJ/mol</em>

<h2>Explanations</h2>

The formula for calculating the amount of heat absorbed by the water is given as:

\begin{gathered} q=mc\triangle t \\ q=50\times4.18\frac{J}{g^oC}\times(19-24) \\ q=50\times4.18\times(-5) \\ q=-1045Joules \\ q=-1.045kJ \end{gathered}

Determine the moles of KI

\begin{gathered} moles\text{ of KI}=\frac{mass\text{ of KI}}{molar\text{ mass of KI}} \\ moles\text{ of KI}=\frac{20g}{166g\text{/mol}} \\ moles\text{ of KI}=0.1205moles \end{gathered}

Since heat is lost, hence the enthalpy change of the solution will be negative that is:

\begin{gathered} \triangle H=-q \\ \triangle H=-(-1.045kJ) \\ \triangle H=1.045kJ \end{gathered}

Determine the enthalpy of solution in kJ•mol-1

\begin{gathered} \triangle H_{diss}=\frac{1.045kJ}{0.1205mole} \\ \triangle H_{diss}\approx8.67kJmol^{-1} \end{gathered}

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