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miss Akunina [59]
4 years ago
13

Which of the following is an endothermic reaction?

Chemistry
2 answers:
telo118 [61]4 years ago
5 0
The answer is the reaction ins a cold pack
aev [14]4 years ago
3 0
Combustion of methane. 
reason behind this is because an endothermic reaction basically means releasing heat when a chemical reaction occurs "endo" meaning outside and "thermic" meaning heat  
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Which statement best describes what happens when a person sees an orange t-shirt?
Alex73 [517]

Answer:

The correct answer is - Orange light reflected from the t-shirt enters human eyes.

Explanation:

Human eyes and brain are altogether able to detect the color of the object by translating the light which is reflected by the object and transmitted by the light receptors in the eyes ad brain translate light to color.

The objects are able to absorb some colors and reflect others on the basis of their wavelength, The reflected colors are detected by our eyes and brain and objects appear to be a particular color. like here, the orange color is reflected by the t-shirt and enters in human eyes.

8 0
3 years ago
Read 2 more answers
Observe the samples of quartz and garnet shown here. How do the minerals differ from one another? How are they alike?
Viefleur [7K]

Answer:

Garnet is a hard transparent mineral that is often used as gemstones and abrasives and quartz is the most abundant mineral on the earth's surface. They are both minerals that come out of the earth and that's about the most they have in common.

Explanation:

I got this answer correct.

6 0
2 years ago
The molar volume of a certain solid is 142.0 cm3 mol−1 at 1.00 atm and 427.15 k, its melting temperature. the molar volume of th
kotykmax [81]

Answer:

\Delta _{fus}H=3255.3J/mol

\Delta _{fus}S=7.62\frac{J}{mol*K}

Explanation:

Hello,

Clausius Clapeyron equation is suitable in this case, since it allows us to relate the P,T,V behavior along the described melting process and the associated energy change. Such equation is:

\frac{dp}{dT}=\frac{\Delta _{fus}H}{T\Delta _{fus}V}

As both the enthalpy and volume do not change with neither the temperature nor the pressure for melting processes, its integration turns out:

p_2-p_1=\frac{\Delta _{fus}H}{\Delta _{fus}V}ln(\frac{T_2}{T_1} )

Solving for the enthalpy of fusion we obtain:

\Delta _{fus}H=\frac{(p_2-p_1)(V_2-V1)}{ln(\frac{T_2}{T_1})} =\frac{(11.84atm-1.00 atm)(156.6cm^3/mol-142.0cm^3/mol)}{ln(\frac{429.26K}{427.15K} )} \\\\\Delta _{fus}H=32127.3atm*cm^3/mol*\frac{101325Pa}{1atm}*(\frac{1m}{100cm} )^3\\\Delta _{fus}H=3255.3J/mol

Finally the entropy of fusion is given by:

\Delta _{fus}S=\frac{\Delta _{fus}H}{T_1} =\frac{3255.3J/mol}{427.15K}\\ \\\Delta _{fus}S=7.62\frac{J}{mol*K}

Best regards.

5 0
3 years ago
What element has only two half-filled orbitals in the 3d sublevel?
azamat

I'm not sure, but I think its Vandium.


4 0
3 years ago
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A box measures 20 cm by 10 cm by 5 cm. The formula used to determine the volume of a regular shaped solid is volume = length x w
Mrrafil [7]

Answer:

1,000 cubed cm

Explanation:

Multiply the numbers together:

20 × 10 × 5

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Have a great summer :)

5 0
3 years ago
Read 2 more answers
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