CHEMISTRY HIGH SCHOOL

The latent heat of vaporization of ethanol is 200 calories/gram. This means that _____. about 200 calories of heat must be added to 1 gram of ethanol to change its temperature about 200 calories of heat must be added to 1 gram of ethanol to convert it from a solid to a liquid about 200 calories of heat must be added to 1 gram of ethanol to convert it from a liquid to a gas

Answers

Answer 1
Answer: Heat of vaporization refers to the amount of energy required to vaporize some amount of a substance depending on the units.  Since the units in this case is calories/gram, 200 calories are required to vaporize 1 gram of ethanol.  This means that it takes 200 calories to convert 1 gram of ethanol from a liquid to a gas.

I hope this helps.  Let me know if anything is unclear.
Answer 2
Answer:

Answer:

about 200 calories of heat must be added to 1 gram of ethanol to convert it from a liquid to a gas

Explanation:

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How many grams are in 4.5 moles of Li2O?
SE DESEA OBTENER UNA SOLUCION 0.3 MOLARIDAD DE HIDROXIDO DE POTASIO DISOLVIENDO 60 GRAMOS DE HIDROXIDO -¿QUE VOLUMEN DE SOLUCION SE OBTENDRA QUIMICA

In an experiment to test a new drug’s effectiveness, one group is given a larger dosage than is typically prescribed, and a second group is given a smaller dosage than is typically prescribed. Then, the results of the groups are compared to each other. What is missing that would improve this scientific design? control group

Answers

for the other group to pesxribe add another half to the bottle

Answer:

Need a control group.

Explanation: Without a control group you would not be able to interpret the results correctly.

A substance has a triple point at -24.5 ∘C and 225 mmHg. What is most likely to happen to a solid sample of the substance as it is warmed from -35 ∘C to 0 ∘C at a pressure of 220 mmHg? A substance has a triple point at -24.5 and 225 . What is most likely to happen to a solid sample of the substance as it is warmed from -35 to 0 at a pressure of 220 ? The solid will melt into a liquid, The solid will sublime into a gas, or Nothing (the solid will remain as a solid).

Answers

Answer:

The solid will sublime into a gas

Explanation:

See the phase diagram attached (the diagram is not an exact representation of this case, it is only illustrative). You starts at point A, that is, a point below triple point pressure (220 mmHg is lower than 225 mmHg) and to the left of triple point temperature (-35 °C is lower than -24.5 °C). Then, you move to point B, which is at the same pressure at A but its temperature is to the right of triple point temperature (0°C is greater than -24.5 °C).
this product remains as mercury if it is subatomic

Determine the pH of a 5x10^-4 M solution of Ca(OH)2

Answers

Ca(OH)₂ ==> Ca²⁺ + 2 OH-   

Ca(OH)₂ is strong Bases

Therefore,  the [OH-] equals 5 x 10⁻⁴ M. For every Ca(OH)₂ you produce 2 OH⁻.

pOH = - log[ OH⁻]

pOH = - log [ 5 x 10⁻⁴ ]

pOH = 3.30

pH + pOH = 14

pH + 3.30 = 14

pH = 14 - 3.30

pH = 10.7

hope this helps!

Name two metals that do not always lose the same number of electrons

Answers

Copper and Iron are two metals that can lose different numbers when they react with another molecule.

What are transition metals?

  • These are the metals that have variable valence electrons and form many-colored co-ordinate compounds.

  • The transition metals have variable oxidation state means they can lose different numbers of electrons while making a bond.

  • The variable oxidation state is due to the electronic configuration in which they have partially filled d- block which allows them to have variable oxidation numbers.

Therefore, copper and Iron are two metals that can lose different numbers when they react with another molecule.

Learn more about Transition metals:

brainly.com/question/8098159
it would be copper and iron -A

4. HOW MANY MOLECULES ARE IN 1.5 MOL OF SULFUR TRIOXIDE?

Answers

Sulfur trioxide is SO3
Now to find number of particles we take number of moles x avogadros number.
1.5 x (6.02x10^23) = 9.03x10^23 molecules

Which one of the following groups of chemical compounds is composed entirely of organic compounds?A. C2H4O, CH2O, CaSO4
, C3H5
(OH)3
B. C2H2
, CH4
, CaCl2
, CaCN2
C. Ch3OCH3
, Ca3
(PO4
)2
, CO2
, H2CO3
D. C6H6
, C2H5OH, C6H5CH3
, C3H5
(NO3
)3

Answers

Answer;

D. C6H6, C2H5OH, C6H5CH3, and C3H5(NO3)3.

Explanation;

-Organic compound are chemical compounds in which one or more atoms of carbon are covalently linked to atoms of other elements, most commonly hydrogen, oxygen, or nitrogen, like the examples above in choice D. . Inorganic Compoundson the other hand, are compounds made from any elements except those compounds of carbon, such as CaSO4, CaCl2 and Ca3(PO4)2 in A, B and C respectively.
The correct answer is D.

In group A, CaSO4 is not organic; in group B, CaCl2 is not organic; in group C, Ca3(PO4)2 is not organic.

Hope this helps~
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