Question 14 (5 points)

A 4.700 L sample of gas is cooled from 71.0 °C to a temperature at which its volume is 3.300 L. What is this new temperature? As

Dafna11 [192]

initial condition : Vi = 4.700 L , Ti = 71.0ºC +273 => 344 K

final condition : Vf = 3.300 L , Tf = ?

Pressure is constant:

According to charle's law , volume is directly proportional to temperature at constant pressure !

Hence Vi / Ti = Vf / Tf

4.700 L / 344 K = 3.300 L / Tf

Tf = 3.300 L * 344 K / 4.700 L

Tf = 1135200 / 4.700

Tf = 241.53 K

Tf = 241.53 - 273

Tf = -31.47ºC

8 0

3 years ago

What is the order of the events for the water cycle on a typical warm day?

ahrayia [7]

A water cycle is the process where water moves between the earth's surface and the atmosphere and vice versa.

There are four stages of water cycle and these are evaporation, condensation, sublimation, precipitation, transpiration, runoff and infiltration.

STAGE 1: EVAPORATION- This is when the warmth from the sun causes waters from different bodies of water like the oceans, lakes, rivers, streams and ice to rise into the air and transforms into gases or water vapor.

STAGE 2: CONDENSATION- The vaporized water would then rise up in the atmosphere. In areas of high altitude, the water vapor changes into very tiny particles of ice/water droplets. This is because the temperature is low in high altitudes. This is also when the particles come together and form into clouds and fogs in the sky.

STAGE 3: SUBLIMATION- This is the counterpart of evaporation. This is the process where ice is being converted directly into water vapor. This happens when the temperature is low or pressure is high.

STAGE 4: PRECIPITATION- The clouds (condensed water vapor) pours down as the precipitation, which is affected by the wind or temperature, changes. This occurs because the water droplets combine with one another to form bigger droplets.

STAGE 5: TRANSPIRATION- This process is similar to evaporation but it happens in plants. The roots of the plants absorb the water and push it towards the leaves where it is used in photosynthesis. The excess water is then being extracted out of the leaves through the pores of the leaves or the stomata.

STAGE 6: RUNOFF- This is the process where water literally runs or flows in the earth's surface. When snow melts into water it has the tendency to runoff.

STEP 7: INFILTRATION- This is when some of the water precipitates does not runoff into the rivers. Instead, they are absorbed by the plants or got evaporated and moves deep down into the soil.

3 0

3 years ago

Determine if the individual bonds in each compound are polar or nonpolar.

almond37 [142]

Answer:

See explanation

Explanation:

For SCl2

S = 2.8, Cl = 3.16 difference = 0.4 polar

H2S

H = 2.2 S= 2.8 difference = 0.6 polar

CF4

C = 2.55, F= 3.98 difference = 1.43

This compound is nonpolar irrespective of the difference in electronegativity because the molecule is symmetrical

PCl5

P= 2.19, Cl= 3.16 difference = 0.97

This compound is nonpolar irrespective of the difference in electronegativity because the molecule is symmetrical

CH4

C = 2.55 H = 2.2 difference = 0.35 the molecule is nonpolar

CaBr2

Ca= 1 Br= 2.96 difference = 1.96

The compound is not just polar but ionic in nature due to large electronegativity difference between the bonding atoms

SF2

S = 2.8 F= 3.98 difference = 1.18

The molecule is polar

CO2

C= 2.55 O= 3.44 difference = 0.89

This compound is nonpolar irrespective of the difference in electronegativity because the molecule is symmetrical

NH3

N= 3.04 H = 2.2 difference =0.84

The molecule is polar

NaS

Na= 0.93 S = 2.8 difference = 1.87

The compound is not just polar but ionic in nature due to large electronegativity difference between the bonding

4 0

3 years ago

What is the melting point of a solution in which 2.5 grams of sodium chloride is added to 230 mL of water?

Zina [86]

0.976 should be the answer.

5 0

3 years ago

Read 2 more answers

What is the atomic number equal to? Select all correct answers.

expeople1 [14]

Answer:

i did some research and the answers came out as Protons And Electrons and possibly neutrons.

Explanation:

Im not 100% sure but if it helps you my mission is complete.

6 0

3 years ago