how many single covalent bonds does beryllium form in BeCl2?

Explanation:

Monosaccharides are simple carbohydrates that cannot be further hydrolyzed to simpler carbohydrates. They contain between three and six carbon atoms per molecule.

Polysaccharides  are complex carbohydrates . They are condensation polymers derived from very long chains of monosaccharide units.

Structurally, polysaccharides are made up of repeating units of monosaccharides.

Answer:

there are three types of law

newton first, second and third law

which law you asked.

Explanation:

Answer:

tell how you feel

Explanation:

don't be afraid to express your feeling.  

Answer:

slowly approach them and tell your feelings

Answer:

I believe it’s hot water.

Explanation:

Drops of food coloring placed in hot water will spread color faster than drops of food color in cold water because the particles will move faster at higher temperatures.

Answer:

182.81 g/mol

Explanation:

Answer:

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

Answer:

A

Explanation:

Be certain that the data collected will fully support the hypothesis

Answer: D. Determine whether it is possible to gather the necessary data.

Answer:

b

Explanation:

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.

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:

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

Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, sodium and potassium are the two element  most likely to have similar physical properties.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.

The chances are high that sodium and potassium share both physical and chemical characteristics. They are both members of the Alkali metals family. Both are extremely reactive and share the same valence electrons. The elements in the same group have same physical and chemical properties.

Therefore, sodium and potassium are the two element  most likely to have similar physical properties.

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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:

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

ancient Greece of 400 B.C.there was a brilliant philosopher named Democritus, and he proposed the Greek word atomos, which means uncuttable. And so as he explained, all matter was eventually reducible to discrete, small particles or atomos.

Answer:

D) The equator

Explanation:

To solve this we must be knowing each and every concept related to  solar energy. Therefore, the correct option is option D among all the given options.

Sun energy is the term for solar radiation that may create heat, trigger chemical processes, or create electricity. The total solar energy incidence on Earth is far greater than the global energy needs at the now and in the future.

Although sunlight is unquestionably the most potent energy source that Earth receives from the Sun, its intensity at the surface of the planet is really rather modest.  When nearly vertical rays of solar energy strike a region of the earth that area has warm temperatures.  Equator is the region of the earth that gets nearly vertical rays of solar energy year around.

Therefore, the correct option is option D.

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Answer:

renewable resources are abundant???

Answer:

renewable resources are abundant!

Explanation:

Answer:

cryolite and oxide

Explanation:

The molten mixture contain what is referred to as cryolite and aluminium oxide in electrolytic production of aluminium.

This is a chemical substance which when dissolved in water conducts electricity.

The aluminium oxide and cryolite mixture are involved in the production of aluminium with carbon dioxide being given off.

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Explanation:

i think it is a polar bond but I am not sure

Answer:

i believe it forms a covalent bind by sharing the electrons, so closest would be Ionic

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:

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

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:

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:

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:

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:

three alleles

Explanation:

119.37 g/mol

Relative atomic mass (Ar) and relative molecular mass / molar mass (M)  

the molar mass/molecular mass of a compound : the sum of the relative atomic mass (Ar) of the constituent atoms

M AxBy = (x.Ar A + y. Ar B)  

Atomic weight (Ar) of :

The molar mass of CHCl₃

[tex]\tt CHCl_3=12.0107+1,00784+(35,453\times 3)=119.37~g/mol[/tex]

The molar mass of [tex]CHCl_3[/tex] (chloroform) is 119.37 g/mol. Therefore, the correct option is C.

The organic compound chloroform, which has the molecular formula [tex]CHCl_3[/tex], is well known for its use as a solvent and anaesthetic. It consists of three chlorine atoms (Cl), one hydrogen atom (H), and one carbon atom (C).

The molar mass of carbon (C) is approximately 12.01 g/mol, the molar mass of hydrogen (H) is approximately 1.01 g/mol, and the molar mass of chlorine (Cl) is approximately 35.45 g/mol. We add up the molar masses of all the individual atoms to determine the molar mass of [tex]CHCl_3[/tex]:

(1 * molar mass of C) + (1 * molar mass of H) + (3 * molar mass of Cl)

(1 * 12.01 g/mol) + (1 * 1.01 g/mol) + (3 * 35.45 g/mol)

12.01 g/mol + 1.01 g/mol + 106.35 g/mol

The molar mass of [tex]CHCl_3[/tex] is approximately 119.37 g/mol.

Therefore, the correct answer is C.

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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