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3 years ago

(blank) from digested carbohydrates is an important substance that contains stored chemical energy.

Chemistry

1 answer:

Debora [2.8K]3 years ago

5 0

E because glucose is a very important energy to help an organism

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a gas sample has a total pressure of 1.7atm. if the sample contains 2 gases and 1 gas has pressure of 0.7 atm, what is the press

Sonja [21]

Answer:

1 atm

Explanation:

The other gas exerts the remaining pressure

1.7 - .7 = 1 atm

8 0

3 years ago

A sample of nickel is heated to 99.8 degrees C and placed in a coffee cup calorimeter containing 150.0g water at 23.5 degrees C.

vesna_86 [32]

Answer: The mass of nickel that was originally heated is 28.4 grams.

Explanation:

When metal is dipped in water, the amount of heat released by metal will be equal to the amount of heat absorbed by water.

$Heat_{\text{absorbed}}=Heat_{\text{released}}$

The equation used to calculate heat released or absorbed follows:

$Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})$

$m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)]$ ......(1)

where,

q = heat absorbed or released

$m_1$ = mass of nickel = ?

$m_2$ = mass of water = 150.0 g

$T_{final}$ = final temperature = 25.0°C

$T_1$ = initial temperature of nickel = 99.8°C

$T_2$ = initial temperature of water = 23.5°C

$c_1$ = specific heat of nickel = 0.444 J/g°C

$c_2$ = specific heat of water= 4.186 J/g°C

Putting values in equation 1, we get:

$m_1\times 0.444\times (25.0-99.8)=-[150.0\times 4.186\times (25.0-23.5)]$

$m_1=28.4g$

Hence, the mass of nickel that was originally heated is 28.4 grams.

3 0

3 years ago

Read 2 more answers

Lauryl alcohol is obtained from cocon ut oil and is used to make detergents. A solution of 5.00 g of lauryl alcohol in 0.100 kg

Len [333]

Answer:

185.2 g/mol.

Explanation:

Solvent = Benzene

Solute = lauryl alcohol

Given:

Mass of solute = 5 g

Mass of solvent = 0.1 kg

Freezing point of solvent, Temp.f = 4.1 °C

Initial freezing point of solvent, Temp.i = 5.5 °C

Molal freezing depression constant for Benzene, kf = 5.12 °C/m

ΔTemp.f = Temp.f - Temp.i

= 5.5 - 4.1

= 1.4 °C

ΔTemp.f = kf * m

Where m = molality

m = 1.4/5.12

= 0.27 mol/kg

Molality = number of moles of solute/mass of solvent

Number of moles = 0.27/0.1

= 0.027 mol.

Molar mass = mass/number of moles

= 5/0.027

= 185.2 g/mol.

3 0

3 years ago

The metric unit of force is the A. nanometer. B. gram. C. newton. D. kilogram.

maks197457 [2]

B. Newton
Is the metric unit of force

7 0

3 years ago

Benzene is a starting material in the synthesis of nylon fibers and polystyrene (styrofoam). Its specific heat capacity is 1.74

katovenus [111]

Answer:

Explanation:

The amount of energy released or absorbed is equal the product of the mass, the specific heat capacity and the temperature change. The temperature change being the difference between the final and initial temperature.

Q = mc∆T

Q = heat energy (Joules, J) m = mass of a substance (kg) c = specific heat (units J/g∙K)

∆ is a symbol meaning "the change in" ∆T = change in temperature (Kelvins, K)

From the data provided in the question, we can deduce that:

Q = 16.7KJ = 16,700J

m = 225g

c = 1.74J/g.k

For the temperature, let the final temperature be f. This means our ∆T = f - 20

16,700 = 225 * 1.74 * (f - 20)

16700 = 391.5 (f - 20)

f - 20 = 16700/391.5

f - 20 = 42.7

f = 20 + 42.7 = 62.7

Hence the final temperature is 62.7 degrees Celsius

6 0

3 years ago