HELP PLEASE !!!!! which of the following molecules has a bent shape

Answer:

32.567+135.0+1.4567=169.027

to significant figures is 16

Answer:

The freezing point of water will be lowered 3°C

Explanation:

Remember that molality is generally the standard for calculating the concentration, between molarity and molality. In this question we have to apply molality, given the units as moles and kilograms.

We can start by receiving the molality of this solution through the following formula...

[tex]\mathrm{m}=\mathrm{(mass}\mathrm{/molar\:mass)} * (1000/\mathrm{mass\:of\:solvent)},[/tex]

[tex]\mathrm{m} =\mathrm{(400.0 g / 62.07 g/mol) * (1000 / 4000.0 g)},[/tex]

[tex]\mathrm{m} = (400/62.07) * (1000 / 4000) = \left(\frac{400}{62.07}\right)\left(\frac{1000}{4000}\right) = \frac{1000}{620.7} = 1.61108\dots\mathrm{m}[/tex]

Now we can determine how much the freezing point of water will be lowered, given that the freezing-point depression constant for water is Kf= –1.86°C/m. Remember that " Kf " is the final temperature, so to determine how much the temperature of the water will decrease, we can note the change in temperature...

[tex]\mathrm{change\:in\:temperature} = ( - 1.86\mathrm{C/m})(1.61\mathrm{m}) = - 1.86 * 1.61 = -2.9946[/tex]

[tex]-2.9946 = \mathrm{About\:-3C}[/tex]

Hence the freezing point of water will be lowered 3°C.

Answer:yes

Explanation:

Answer:

C2H4O

two atoms of carbon four atoms of hydrogen and one atom of oxygen

Answer:

Your answer is salt. Pure substances are made of materials with one type of molecule. Seawater has salt and water molecules, which is more than one, so your answer is salt.

Hope this helps!

Answer:

D. Molecules in bromine and air moved randomly  

Explanation:

The molecules of both bromine and air are in the gas phase.

Since the molecules of gases are far apart and moving randomly, the bromine and air molecules can easily mix together.

A is partially correct. bromine is denser than air, but that doesn't explain why they mix.

B is wrong. Bromine is denser than air.

C is partially correct. The molecules of bromine and air moved upwards and downwards, but the also moved randomly in many other directions.

Answer:

no

Explanation:

For any given isotope, the sum of the numbers of protons and neutrons in the nucleus is called the mass number. This is because each proton and each neutron weigh one atomic mass unit . By adding together the number of protons and neutrons and multiplying by 1 , you can calculate the mass of the atom.

Answer:

No

Explanation:

An element's mass number (A) is the sum of the number of protons and the number of neutrons. Protons and neutrons both weigh about one atomic mass unit or amu. Isotopes of the same element will have the same atomic number but different mass numbers.

Thus, the s subshell may contain only one orbital and the p subshell may contain three orbitals. Each orbital has its own distinct shape. An s orbital found in a s subshell is spherical, p orbitals found in p subshells are two-lobed, and d orbitals found in d subshells are four-lobed.

Answer:

The s-subshell may contain only one orbit and the p-subshell may contain three orbits . Each orbit has it own distinct shape

May this helps you

Answer:

Hey there!

A MSDS is a Material Safety Data Sheet, and can be used to provide detailed and comprehensive information about the hazards of a certain product, such as medicine or chemicals.

Let me know if this helps :)

Answer:

0

Explanation:

Positive Change of 2 cancels the negative charge of 2

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the overall charge of atom that contains 2 electron and 2 proton is zero.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. The overall charge of atom that contains 2 electron and 2 proton is zero.

Therefore, the overall charge of atom that contains 2 electron and 2 proton is zero.

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Answer:

true.................

Answer:

Thermal energy that is transferred from one substance to another,moves from warmer to cooler objects. So True.

Explanation:

Answer:

A) mL / s

Explanation:

Answer:

c. -1020.9 kJ

Explanation:

4Fe (s) + 3 O₂ (g) --> 2 Fe₂O₃(s)         ΔH  =  -826.0 kJ/mol.

atomic weight of iron = 56

69.03 g = 69.03 / 56

= 1.23268 moles

Heat released by 1.23268 moles

= 1.23268 x 826.0

= -1020.9 kJ .

Answer:

increases

Explanation:

Answer: will also increase

Explanation:

If the mass in a sample increases, the number of molecules will also increase. Hope this helps!

Answer:

F=ma.

mass=77, acceleration=2.3.

77×2.3=177.1Newton

Answer:

This question appears incomplete

Explanation:

However, a glassware/instrument that is used to carry out small reactions is a beaker. It is a cylindrical instrument usually made of glass (so as not to take part in the reaction). It can also be put over a bunsen burner to heat up its content in the process of a chemical reaction. It is quite ideal for small reactions.

Answer:

In science, you are looking for something and you discovered something else. This leads to many discovery among the world.

Answer: nitrogen

Explanation:

Answer:

250 g

Explanation:

Answer:

-

Alcohol-related diseases frequently cause low Mg+ levels.

- Mg+ deficiencies must be treated before potassium (K+) deficiencies.

- Mg+ deficiencies often result in low serum potassium (K+)

- Mg++ levels present similarly to calcium (Ca++) levels in the blood.

- Vomiting is not generally seen as a major cause of Mg+ loss

Answer:

Answer:

A. What is the composition of air?, B. Should the driving age be reduced?, D.

Should students be allowed to bring toys to school? Answer: A,B,D.

Answer:

B. PEA = KEC. +PEC

Explanation:

From the figure it is clear that there is interconversion between potential energy ( PE ) and kinetic energy ( KE ) , so that total mechanical energy is conserved .

At A only potential energy exists . Kinetic energy is zero .

At B only kinetic energy exists . Potential energy is zero .

At C both potential and kinetic energy exist .

So Potential energy at A is equal to potential energy at C and kinetic energy at C

Ie , PEA = KEC + PEC .

Option B is correct .

Answer:

The volume of the steel is 10cm3

Explanation:

Density is defined as the mass contained per unit volume.

Density= Mass

volume

Given : Mass of steel = 80 grams

Density of steel = 8g/cm3

Putting in the values we get:

8g/cm3 = 80g

Volume

Volume=80/8

=10

Thus the volume of steel is 10cm3

Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, the volume of  sample of steel is 10cm³  if the density of his sample of steel is 8 g/cm³.

Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.

Mathematically, the formula for density can be given as

Density = Mass of the metal  ÷volume marked on the graduated cylinder

Mass of steel = 80 grams

Density of steel = 8g/cm³

substituting all the given values in the above equation, we get

Volume of steel=80/8

On calculations, we get

Volume of steel  =10cm³

Therefore, the volume of  sample of steel is 10cm³.

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Answer:

atoms

Explanation:

for sugar to dissolve in water hydaration must be equal to or greater than the lattice energy or molecular forces so when the molecular forces breaks new atoms are formed for recombination in new compound

Answer:

For a mild human cough in air at 20 °C and 50% relative humidity, we found that ... larger droplets are dispersed into smaller ones gradually while moving away from the ... Complex phase change and transport phenomena such as evaporation and ... Natural Ventilation for Infection Control in Health-Care Settings

Explanation

Answer:

3–ethyl–4–methylhexane.

Explanation:

To name the above compound, do the following:

1. Determine the functional group of the compound.

2. Locate the longest continuous carbon chain. This gives the parent name of the compound.

3. Identify the substituent group attached to the compound.

4. Give the substituent the lowest possible count.

5. Combine the above to name the compound.

Now, we shall name the compound given in the question above as follow:

1. The compound contains only single bond. Therefore, the compound belong to the alkane family.

2. The longest continuous carbon chain is 6 i.e hexane.

3. The substituent group attached are:

i. Methyl, CH3.

ii. Ethyl, CH2CH3.

4. we shall name the substituents alphabetically i.e ethly will come before methyl. Therefore,

Ethyl is located at carbon 3.

Methy is located at carbon 4.

5. Therefore, the name of the compound is:

3–ethyl–4–methylhexane.

Answer:

a) 0.154 moles of N2

b) 9.27 × 10^22 molecules

c) 4.312 g

Explanation:

a)

1 mole of N2 contains 6.02 × 10^23 atoms

x moles of N2 contains 9.26 × 10^22 atoms

x= 9.26 ×10^22/6.02 × 10^23

x= 1.54 ×10^-1

x= 0.154 moles of N2

b)

1 mole of N2 contains 6.02 × 10^23 molecules

0.154 moles of N2 contains 0.154 moles × 6.02 × 10^23 = 9.27 × 10^22 molecules

c)

Molar mass of the nitrogen gas= 28 gmol^-1

Number of moles of nitrogen gas = 0.154 moles

Number of moles = mass/molar mass

0.154 moles= mass/28 gmol^-1

Mass= 0.154 moles × 28gmol^-1

Mass= 4.312 g

Answer:

Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability.

Explanation:

Answer:

The heat of solution of the compound = 42.75 kJ/mol

Explanation:

Here we have;

The heat of vaporization = 21.99 kJ/mol

2.56 g of the compound is then placed in 200 g. of water

The temperature of the water reduces from 68.25°C to 67.91°C

The specific heat capacity of water = 4.19 kJ/kg = 4.19 J/g

Mass of the water = 200 g

Heat lost by the water ΔH = m × c × Δθ = n × ΔH vaporization of the compound

Where;

m = The mass of the water = 200 g

c = The specific heat capacity of water = 4.19 kJ/kg = 4.19 J/g

Δθ = The change in temperature = 68.25°C - 67.91°C = 0.34°C

n = The number of moles of the compound

ΔH = m × c × Δθ = 200×4.19×0.34 = 284.92 J = 0.28492 kJ

∴ n × ΔH vaporization of the compound = 0.28492 kJ

n = 0.28492 kJ/( ΔH vaporization of the compound) = 0.28492/21.99≈0.013 moles

∴ 2.56 g = 0.013 moles

1 mole = The molar mass of the compound = 2.56/0.013= 197.6 g/mol

Therefore;

The number of moles in 55.6 g of the compound = 55.6/197.6 = 0.2814 moles

The heat given by the water = ΔH = 495 × (25.2 - 19.4) × 4.19 = 12029.49 J

Therefore;

0.2814 × ΔH(solution) = 12029.49 J = 12.02949 kJ

ΔH(solution) = 12.02949/0.2814 = 42.75 kJ/mol

The heat of solution of the compound = 42.75 kJ/mol.