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3 years ago

NOOO LINNKKKSSS

Chemistry

2 answers:

Anvisha [2.4K]3 years ago

8 0

I believe the answer is d :)!

Elena L [17]3 years ago

3 0

The answer is D I hope this helps you !

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Which of the following describes scientists?

jasenka [17]

Answer:C.people with perfect understanding of science.

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Assume that a daily diet of 2000 calories (i.e. 8.37 x 106 J) is converted completely to body heat.

slava [35]

Answer:

(a) the mass of the water is 3704 g

(b) the mass of the water is 199, 285.7 g

Explanation:

Given;

Quantity of heat, H= 8.37 x 10⁶ J

Part (a) mass of water (as sweat) need to evaporate to cool that person off

Latent heat of vaporization of water, Lvap. = 2.26 x 10⁶ J/kg

H = m x Lvap.

$m = \frac{H}{L._{vap}} =\frac{8.37 * 10^6.J}{2.26*10^6\ \frac{J}{kg}} = 3.704 \ kg$

mass in gram ⇒ 3.704 kg x 1000g = 3704 g

Part (b) quantity of water raised from 25.0 °C to 35.0 °C by 8.37 x 10⁶ J

specific heat capacity of water, C, 4200 J/kg.°C

H = mcΔθ

where;

Δθ is the change in temperature = 35 - 25 = 10°C

$m =\frac{H}{c* \delta \theta} = \frac{8.37 *10^6}{4200*10} = 199.2857 kg$

mass in gram ⇒ 199.2857 kg x 1000 g = 199285.7 g

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3 years ago

Nuclear energy is currently used in which three kinds of vehicles?

qaws [65]

Nuclear power plants produce little to no greenhouse gas.

Nuclear power plants produce a large amount of energy for a small mass of fuel.

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3 years ago

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My Everest is the highest mountain on earth.its height is 8.848 km. Convert this height to feet. Write your answer in standard n

Vinvika [58]

Answer: $2.9(10)^{7} ft$

Explanation:

Firstly we need to know that $1 km=3280.84 ft$ , then we cam make the conversion:

$8848 km \frac{3280.84 ft}{1 km}=29,028,872.32 ft$ This is the height of Mount Everest in feet

However, we can express it using scientific notation by counting to the left the decimal spaces:

$29,028,872.32 ft \approx 2.9(10)^{7} ft$

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3 years ago

after a chemistry student made a AgNO3(small 3 at bottom) solution., she wanted to determine the molar concentration of it. if 2

Alexxandr [17]

Molar concentration = (numbet of mol Solute)/ ( volume Solution)

1) Finding
the number of the mol solute

$22.0 g AgNO3 * \frac{1 mol AgNO3}{169.91 g AgNO3} = 0.129 mol AgNO3

2) 725 ml = 0.725 L


$

$3) Molarity = \frac{number/ mol/solute}{Volume/solution} = \frac{0.129}{0.725} 

$

$Molarity= \frac{0.178 mol}{L} , 

or 0.178 M
$

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3 years ago