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goldenfox [79]
3 years ago
5

Which of the following processes involves only physical change? A. decay B. sublimation C. digestion D. combustion

Chemistry
2 answers:
mote1985 [20]3 years ago
8 0

Answer:

\huge \boxed{\mathrm{B. \ sublimation}}

Explanation:

Sublimation is a process that involves only a physical change. Sublimation is a change in a state of matter from solid state to gas state. An example of sublimation can be dry ice, from its solid state to gas state.

grigory [225]3 years ago
5 0
B. Sublimation
Sublimation is the change of a liquid from the liquid state to the gas state. That’s why it’s only involves a physical change. Also, you can go back to the liquid stage.
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True or False
DedPeter [7]

Answer:

true

Explanation:

4 0
3 years ago
Read 2 more answers
A 360. g iron rod is placed into 750.0 g of water at 22.5°C. The water temperature rises to 46.7°C. What was the initial tempera
Grace [21]

Answer: The initial temperature of the iron was 515^0C

Explanation:

heat_{absorbed}=heat_{released}

As we know that,  

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 iron = 360 g

m_2 = mass of water = 750 g

T_{final} = final temperature = 46.7^0C

T_1 = temperature of iron = ?

T_2 = temperature of water = 22.5^oC

c_1 = specific heat of iron = 0.450J/g^0C

c_2 = specific heat of water= 4.184J/g^0C

Now put all the given values in equation (1), we get

-360\times 0.450\times (46.7-x)=[750\times 4.184\times (46.7-22.5)]

T_i=515^0C

Therefore, the initial temperature of the iron was 515^0C

4 0
3 years ago
Based on your knowledge of intermolecular forces and trends, select the statement that is most accurately compares HF and HCl.
tangare [24]

Answer:

(A) The intermolecular attraction between HF molecules are stronger than between HCl molecules mainly to due hydrogen bonding.

Explanation:

Since Flourine is highly electronegative and as such, when it bonds with Hydrogen it forms a hydrogen bond. Whereas the HCL molecule  is a polar molecule whose inter-molecular forces are dipole dipole interactions. Although a Hydrogen bond is a type of dipole dipole interaction it is stronger than the traditional dipole dipole forces and London dispersion forces. HF also has a shorter bond length which makes the bond and inter-molecular forces  stronger as compared to HCL.

8 0
3 years ago
Think of Earth's shape. How does the shape of Earth affect the amount of heat different
diamong [38]

Answer: The Earth is an oblate spheroid which is more elongated along the equator.

Regions along the equator receives more amount of direct sunlight from the sun causing higher temperatures along the region. While places along the poles receives less amount of heat since heat is scattered in a larger area due to the shape of the Earth around the poles.

Explanation: So places along the equator experiences higher temperature due to the direct hit of sunlight. And places along the polar regions experiences cooler temperature since it receives less amount of sunlight.

8 0
3 years ago
A sample of lead with a mass of 54.3 g is heated to a temperature of 384.4 K and placed in a container of water at 291.2 K. The
DerKrebs [107]

The mass of the water in the container given the data from the question is 22.5 g

<h3>Data obtained from the question</h3>
  • Mass of cold lead (M) = 54.3 g
  • Temperature of lead (T) = 384.4 K
  • Temperature of water (Tᵥᵥ) = 291.2 K
  • Equilibrium temperature (Tₑ) = 297.6 K
  • Specific heat capacity of the water (Cᵥᵥ) = 4.184 J/gK
  • Specific heat capacity of lead (C) = 0.128 J/gK
  • Mass of water (Mᵥᵥ) = ?

<h3>How to determine the mass of water </h3>

Heat loss = Heat gain

MC(T – Tₑ) = MᵥᵥCᵥᵥ(Tₑ – Tᵥᵥ)

54.3 × 0.128 (384.4 – 297.6) = Mᵥᵥ × 4.184(297.6 – 291.2)

6.9504 × 86.8 = Mᵥᵥ × 4.184 × 6.4

Divide both side by 4.184 × 6.4

Mᵥᵥ = (6.9504 × 86.8) / (4.184 × 6.4)

Mᵥᵥ = 22.5 g

Learn more about heat transfer:

brainly.com/question/6363778

#SPJ1

8 0
2 years ago
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