Energy must be removed from a liquid to change it to a solid.

True or false?

Answer:

Elements in the same period have the same number of atomic orbitals.

Explanation:

The number of orbitals depends on the row. (E.g. all elements in the top row have the same number of atomic orbitals: 1. All elements in the second row have 2 atomic orbitals for their electrons.)

Answer:

Mass of calcium chloride produced = 24.14 g

Explanation:

Given data:

Mass of ammonia produced = 7.4 g

Mass of calcium chloride produced = ?

Solution:

Chemical equation:

2NH₄Cl + CaO      →   2NH₃ + H₂O + CaCl₂

Number of moles of ammonia produced:

Number of moles = mass/molar mass

Number of moles = 7.4 g/ 17 g/mol

Number of moles =  0.435 mol

Now we will compare the moles of ammonia and calcium chloride.

             NH₃          :         CaCl₂

              2              :              1

          0.435          :         1/2×0.435 = 0.2175 mol

Mass of calcium chloride produced:

Mass = number of moles × molar mass

Mass = 0.2175 mol ×110.98 g/mol

Mass = 24.14 g

Answer:

there are three types of law

newton first, second and third law

which law you asked.

Explanation:

The four spheres are closely related, and continuously interact.

The earth is divided into four spheres;

Matter cycles through all these four spheres of the earth via the diverse biogeochemical cycles that exist in nature such as oxygen cycle, carbon cycle, nitrogen cycle etc. Most of these cycles have components in all the four earth spheres.

Therefore, the four spheres are closely related, and continuously interact.

Learn more: https://brainly.com/question/24092645

Answer:

It’s A

Explanation:

Got it right on edge just wanted to give the simple answer

Answer:

A. It will probably snow today.

Answer:

false

Explanation:

electronic configuration of oxygen is 2,6   that means it has 6 electrons in its last shell. but it can hold 8.so it is unstable so to be stable oxygen needs another 2 electrons so that it becomes 8 ( 6 + 2 = 8 )

so oxygen takes 2 electrons which result in -2

Answer:

renewable resources are abundant???

Answer:

renewable resources are abundant!

Explanation:

Answer:

Number of moles of oxygen = 0.037  mol

Explanation:

Given data:

Total pressure = 98.5 KPa

Partial pressure of nitrogen = 22.0 KPa

Partial pressure of argon = 50.0 KPa

Volume = 3.5 L

Temperature = 25°C (25+273= 298K)

Number of moles of oxygen = ?

Solution:

Total pressure = P(N₂) + P(O₂) + P(Ar)

98.5 KPa = 22.0 KPa +P(O₂) + 50.0 KPa

98.5 KPa = 72.0 KPa +P(O₂)

P(O₂)  = 98.5 KPa - 72.0 KPa

P(O₂)  = 26.5 KPa

KPa to atm:

26.5 KPa/ 101 = 0.262 atm

Number of moles of oxygen:

PV = nRT

n = PV/RT

n = 0.262 atm × 3.5 L / 0.0821 atm.L/mol.K  × 298 K

n = 0.917atm.L /24.47atm.L/ mol

n = 0.037  mol

Answer:

Acting like a highly reflective blanket, the cryosphere protects Earth from getting too warm. Snow and ice reflect more sunlight than open water or bare ground. Changes in snow and ice cover affect air temperatures, sea levels, ocean currents, and storm patterns all over the world.

Explanation: Hope this answers your question

Answer:

520ML and apparently I need to put more in this answer

Explanation:

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Answer:

Boiling point of H2S is (-60.2 C°)

Explanation:

This is very less than water because hydrogen bonding is present in water that is absent in H2S

Answer:

so you can dress based on how hot or cold it's gonna be outside

Answer:

182.81 g/mol

Explanation:

Answer:

Cs > Iron > Aluminum > Carbon > Neon

Explanation:

The most metallic from the given choices is Cesium and the least metallic is Neon.

Neon is noble gas and not a solid.

Metallic character of elements decreases across the period and increases with increasing electronegativity.

The most leftward element is Cesium and will be the most metallic. Neon has the least metallic character since it is a noble gas.

    Cesium > Iron > Aluminum > Carbon > Neon

Answer:

See explanation

Explanation:

The work function is given by;

Wo = hc/λ

where;

h = 6.6 * 10^-34 Js

c = 3 * 10^8 ms-1

λ = 281 nm or 281  * 10^-9 m

Wo = 6.6 * 10^-34 * 3 * 10^8 /  281  * 10^-9

Wo = 7.0 * 10^-19 J or 4.375 eV

Note that the work function is the minimum energy required to eject an electron from a sample of tin.

Answer:

three alleles

Explanation:

Answer:

17.38 meters per second

Explanation:

Speed is distance over time so 112.6 / 1.8 hours =62.5555555556 km per hour. TO find it in m/s just divide 62.5555555556 by 3.6 and that is approximately equal to 17.38 meters per second, or at least something close to it.

Please mark brainliest!!! Thanks.

Answer:

A typical range of ATOMIC radii would be 0.050 − 0.200 nm or so.

Answer:

D

Explanation:

Because it has the highest number

A THE ANSWER IS A  

U WELCONM

Answer:

ok

Explanation:

Answer:

Hi

Explanation:

Good morning, thx for the free points, have a great day/night, and stay safe!

Answer:

Volume of gas when release form tank = V₂ = 2026.67 L

Explanation:

Given data:

Initial volume of gas =V₁= 10.0 L

Pressure of gas inside tank =P₁= 30400 mmHg

Volume of gas when release form tank =V₂=  ?

Pressure at peak =P₂= 150 mmHg

Solution:

The given problem will be solved through the Boly's law,

"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"

Mathematical expression:

P₁V₁ = P₂V₂

P₁ = Initial pressure

V₁ = initial volume

P₂ = final pressure

V₂ = final volume  

Now we will put the values in formula,

P₁V₁ = P₂V₂

30400 mmHg × 10.0 L =  150 mmHg × V₂

V₂ = 304000 mmHg. L/  150 mmHg

V₂ = 2026.67 L

Answer:

A common effect of UV radiation is erythema or sunburn.

Explanation:

This happens when skin cells are damaged by the absorption of energy from UV rays.

Answer:

A common effect of UV radiation is erythema or sunburn.

Explanation:

This happens when skin cells are damaged by the absorption of energy from UV rays.

Answer:

tell how you feel

Explanation:

don't be afraid to express your feeling.  

Answer:

slowly approach them and tell your feelings

The pressure of the CO₂ = 0.995 atm

The complete question

A student is doing experiments with CO2(g). Originally, a sample of gas is in a rigid container at 299K and 0.70 atm. The student increases the temperature of the CO2(g) in the container to 425K.

Calculate the pressure of the CO₂ (g) in the container at 425 K.

Gay Lussac's Law

When the volume is not changed, the gas pressure is proportional to its absolute temperature

[tex]\tt \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]

P₁=0.7 atm

T₁=299 K

T₂=425 K

[tex]\tt P_2=\dfrac{P_1\times T_2}{T_1}\\\\P_2=\dfrac{0.7\times 425}{299}=0.995 `atm[/tex]

Answer:

The mooses have been decreasing for quite some time. The wolves have been a cause of this. They have attacked moose for many years because of there DNA and there normal instincs. The wolf population seems to be higher during 1975-1980 because they have been able to Increase more in population due to being able to get food from the moose. That is how the wolf population icreasing accounts for the wolf population Decreasing.

Explanation:

I took a test on this last year. I clearly remember the answer and got 100 on the test. So, I dearly hope this helps.

Answer:

Explanation:

1. A measure of how quickly velocity is changing is the acceleration

Acceleration is the rate of change of velocity with time. The rate at which a body is changing its velocity is known as the acceleration.

It is measured in the unit m/s²

2. Speed in a given direction is the velocity

Velocity is a vector quantity which measures the magnitude of motion in a specific direction. It is simply speed in a given direction.

When we say a motorcycle travels at the rate of 5m/s due east, we are describing the velocity of such body.

3. Force that resists moving one object against another is the friction

Friction is a force that opposes motion. It prevents a body from moving.

4. Measure of the pull of gravity on an object Weight

Weight is a measure of the amount of gravitational force on a body. It is mathematically expressed as;

         W = mg

W is the weight, m is the mass and g is the acceleration due to gravity

5 Tendency of an object to resist a change in motion is inertia

Inertia is the tendency of body to resist change in motion. It is the ability of a body to remain in a perpetual state of rest.

6 Size is the magnitude

Answer:

0.15g

Explanation:

Given parameters:

Mass of Zn  = 5g

Unknown:

Mass of hydrogen gas = ?

Solution:

To solve this problem, we must first write the reaction expression;

                 Zn + 2HCl →  ZnCl₂  + H₂

Now find the number of moles of the known specie which is Zn;

  Number of moles of Zn  = [tex]\frac{mass}{molar mass}[/tex]

    Molar mass of Zn  = 65.4g/mol

 Number of moles of Zn  = [tex]\frac{5}{65.4}[/tex]   = 0.08mole

    1 mole of Zn will produce 1 mole of H₂

    0.08 mole of Zn will give 0.08 mole of H₂

Mass of H₂ = number of moles x molar mass

   molar mass of H₂  = 2(1) = 2g/mol

   Mass of H₂  = 0.08mol x 2g/mol  = 0.15g