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3 years ago

Please help I need 13-16 this is a study guide.

Chemistry

1 answer:

Ira Lisetskai [31]3 years ago

5 0

13. Chemical
14. Thermal
15. Kinetic
16. Hydropower

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An upward force acts on a proton as it moves with a speed of 2.0 × 105 meters/second through a magnetic field of 8.5 × 10-2 tesl

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Explanation :

It is given that,

Speed of the proton, $v=2\times 10^{5}\ m/s$

Magnetic field, $B=8.5\times 10^{-2}\ T$

Magnetic force is given by :

$F=q(v\times B)$

q is the charge of proton, $q=1.6\times 10^{-19}\ C$

So,

$F=1.6\times 10^{-19}\ C\times 2\times 10^{5}\ m/s\times 8.5\times 10^{-2}\ T$

$F=2.72\times 10^{-15}\ N$

The direction of force is given by using right hand rule. So, the force will act in upward direction.

Hence, the correct option is (a) " $2.72\times 10^{-15}\ N$ to the north".

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3 years ago

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4 years ago

A chemist mixes 75.0 g of an unknown substance at 96.5°C with 1,150 g of water at 25.0°C. If the final temperature of the system

AleksAgata [21]

To do this problem it is necessary to take into account that the heat given by the unknown substance is equal to the heat absorbed by the water, but considering the correct sign:

$-m\cdot c_e\cdot \Delta T = m_w\cdot c_e_w\cdot \Delta T_w$

Clearing the specific heat of the unknown substance:

$c_e = \frac{m_w\cdot c_e_w\cdot \Delta T_w}{m\cdot \Delta T} = -\frac{1\ 150\ g\cdot 4.184\frac{J}{g\cdot ^\circ C}\cdot (37.1 - 25.0)^\circ C}{75\ g\cdot (37.1 - 96.5)^\circ C}$

$c_e = -\frac{1\ 150\ g\cdot 4.184\frac{J}{g\cdot ^\circ C}\cdot 12.1^\circ C}{75\ g\cdot (-59.4)^\circ C} = \bf 13.07\frac{J}{g\cdot ^\circ C}$

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3 years ago

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True

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4 years ago

(Boyle's Law):

elena-s [515]

<u>Answer:</u> The final volume will be 16.85 mL

<u>Explanation:</u>

To calculate the new pressure, we use the equation given by Boyle's law. This law states that pressure is inversely proportional to the volume of the gas at constant temperature.

The equation given by this law is:

$P_1V_1=P_2V_2$