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4 years ago

What are some chemacial changes in your school?

Chemistry

1 answer:

Oksanka [162]4 years ago

6 0

Putting glue on something, because once it is set in you cannot change it back.

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A folded rock formation with the label A at the top of one of the folds. A geologist sees this folded rock when studying in the

anzhelika [568]

Answer:

Anticline

Other than that Just A C:

Explanation:

6 0

3 years ago

Calculate the amount of heat required to raise the temperature of a 32g sample of water from 8°C to 22°C.

qwelly [4]

Answer:

The amount of heat required to raise the temperature of a 32g sample of water from 8°C to 22°C is 1,874.432 J

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

Between heat and temperature there is a direct proportional relationship. The constant of proportionality depends on the substance that constitutes the body and its mass, and is the product of the specific heat and the mass of the body. So, the equation that allows to calculate heat exchanges is:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the variation in temperature.

In this case:

c= 4.184 $\frac{J}{g*C}$
m= 32 g
ΔT= Tfinal - Tinitial= 22°C - 8°C= 14°C

Replacing:

Q= 32 g* 4.184 $\frac{J}{g*C}$ *14 °C

Solving:

Q= 1,874.432 J

<u><em>The amount of heat required to raise the temperature of a 32g sample of water from 8°C to 22°C is 1,874.432 J</em></u>

7 0

3 years ago

For the reaction 6CO2(g) + 6H2O(l) > C6H12O6(s) + 6O2(g), what mass, in grams, of glucose is produced from 3.00 moles of carb

aivan3 [116]

Answer:

Mass = 90.1 g

Explanation:

Given data:

Number of moles of carbon dioxide = 3 moles

Mass of glucose produced = ?

Solution:

Chemical equation:

6H₂O + 6CO₂ → C₆H₁₂O₆ + 6O₂

Now we will compare the moles of CO₂ and C₆H₁₂O₆.

CO₂ : C₆H₁₂O₆

6 : 1

3 : 0.5

Mass of glucose:

Mass = number of moles × molar mass

Mass = 0.5 mol × 180.2 g/mol

Mass = 90.1 g

6 0

4 years ago

How many moles of neon gas are there 25.0 L of gas or 5.0°C with a pressure of 89.9 KPa?

vladimir2022 [97]

Volume=25L
Temperature=5°C
Pressure=89.9kPa

Now

$\\ \rm\rightarrowtail PV=nRT$

$\\ \rm\rightarrowtail n=\dfrac{PV}{RT}$

$\\ \rm\rightarrowtail n=\dfrac{89.9(25)}{5R}$

$\\ \rm\rightarrowtail n=89.9(5)/R$

$\\ \rm\rightarrowtail n=449.5/R mol$

8 0

2 years ago

How does the freezing point of a substance relate to its melting point?

NNADVOKAT [17]

Answer:

The melting temperature of a solid is generally considered to be the same as the freezing point of the corresponding liquid; because a liquid may freeze in different crystal systems and because impurities lower the freezing point, however, the actual freezing point may not be the same as the melting point.

<h3>#carryONlearning </h3>

6 0

3 years ago