I'm completely lost and cant find the answer

Answer:

Hello

Coefficients are 1,3,2,1

Explanation

Answer:

Hi there!

The correct answer is 2.29 x [tex]10^{24}[/tex] molecules

Explanation:

To convert from the moles to molecules:

1 mole = 6.022 x 10²³ molecules

so basically you multiply 3.8 by 6.022 x 10²³

and you get: 2.29 x [tex]10^{24}[/tex]

Answer:

The awnser is b

Explanation:

The sound waves get smaller as the sound moves farther away, and since the sound waves are smaller, the sound is quieter. This is known as the Doppler effect.

Answer:

17.37 grams

Explanation:

mass=moles × molar mass

mass = 0.965 × 18

mass = 17.37g

Answer:

250,000 ants are in each colony or ant hill.

Explanation:

hope this helps!

Answer:

1 mile = 1,609 meters

3.02E6 mi^2 x (1609^2m^2/mi^2) = 7.818E12 m^2

1 in= 2.54 cm => 2 in = 5.08cm = .0508m

7.818E12 m^2 x .0508m = 3.97E11 m^3

1 cubic meter = 1,000,000 cubic centimeters

3.97E11 m^3 x (1,000,000 cm^3 / m^3) = 3.97E17 cm^3

1000 cm^3 = 1L

3.97E17 cm^3 x (1L / 1000cm^3) = 3.97E14 L  

or 3.97 x 10^14 L

convert to grams since 1L is 1000g

(3.97x10^14) x1000g which is 3.974x10^ 17g which is the final ans

Explanation:

The water that can be held is 3.974x10¹⁷g

The measures given should be first given to the units in the metric system. In this way, the mile will be converted to meters. Then,

Here,

1 mile = 1,609 meters

So,

3.02 m² x (1609m²/m²) = 7.818E12 m²

According to the metric system, inches will also be converted to meters. So

1 in= 2.54 cm

=> 2 in = 5.08cm = .0508m

Now, Equating these equations,

7.818 m² x .0508m = 3.97 m³

We know that

1 cubic meter = 1,000,000 cubic centimeters

According to that,

3.97 m³ x (1,000,000 cm³ / m³) = 3.97 cm³

Also, we know that,

1000 cm³ = 1L

3.97 cm³ x (1L / 1000cm³) = 3.97 x 10¹⁴ L

Now, converting this value to grams as 1L is 1000g

(3.97x10¹⁴) x1000g = 3.974x10¹⁷g.

Therefore, 3.974x10¹⁷g is the final answer.

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Answer:

A

Explanation:

the same number of molecules occupy a small space

Answer:

1. 0.33 2. 0.1 7

Explanation:

Answer: The highest difference is in between N and H thus this will have greatest polarity.

Explanation:More the electro-negativity between any two elements more the polarity in the bond. Electron negativity is the tendency to pull shared pair of electrons towards it self. If the difference between two bonded elements is way too high then it may result in complete transfer of electrons from the less electronegative element to more electronegative one. Thus the bond will be ionic and highly polar.

Among given options,the electro negativity differences are:

A) Al-Si : 1.9-1.61=  0.29

B) S-Cl : 3.16- 2.58 = 0.58

C) N-H : 3.04 - 2.2 = 0.84

D) C-N : 3.04-2.55 = 0.49

The highest difference is in between N and H thus this will have greatest polarity.

Answer:

Yes! That is trueeee

I hope this helps!!!

Answer:

Blue litmus paper paper turns red under acidic conditions. Red litmus paper turns blue under basic or alkaline conditions. If you're using a universal indicator, the weak base should turn those blue.

Explanation:

Answer:

When the kinetic energy of particles in liquid increases, the particles are pushed farther apart. This can result in the expansion of matter. More pressure will be exerted on the container in which this liquid is stored.

HOPE THIS ANSWER IS HELPFUL!!

Answer:

ultraviolet lights have shorter wavelengths and higher frequencies

Answer:

you are right

Explanation:

and i do not need to explain it because you did

Answer:

Larger atoms tend to be more polarizable than smaller ones because their outer electrons are less tightly bound and are therefore more easily perturbed. Hydrogen bonds are especially strong dipole–dipole interactions between molecules that have hydrogen bonded to a highly electronegative atom, such as O, N, or F.

Explanation:

Answer:

Dalton expressed his assumption in A Modern Model of Chemical Theory that atoms of various elements should be uniformly differentiated, based on their differing atomic weights. In doing so, he became the first scientist to explain atom behavior as regards weight measurement.

Explanation:

Answer:

a. C₈H₁₄N₂O₂ = 107.209 g/mol

b. Approximately 1.4 × 10⁻⁴ moles

c. 8.423 × 10¹⁹ molecules

d. 1.685 × 10²⁰ atoms of oxygen

e. 1.685 × 10²⁰ atoms of nitrogen

Explanation:

The chemical formula is found as follows;

X×12 + 14×1 + 14×2 + 16×2 = 170.209

Where:

X = Number of carbon atoms per mole of C&H₁₄N₂O₂

Therefore;

X × 12 = 170.209 - 74 = 96.209

X = 96.209/12 = 8.017 ≈ 8

The chemical formula is C₈H₁₄N₂O₂

b. The number of moles, n, is found as follows;

[tex]n = \dfrac{Mass \ of \ sample}{Molar \ mass \ of \ the \ sample} = \dfrac{15 \times \dfrac{1}{1000} }{107.209} = 1.4 \times 10^{-4} \ moles[/tex]

c. The number of molecules, N, is given by the following relation;

N = [tex]N_A[/tex] × n

Where:

[tex]N_A[/tex] = Avogadro's number = 6.02 × 10²³ molecules

∴ N = 6.02 × 10²³ × 1.4 × 10⁻⁴ = 8.423 × 10¹⁹ molecules

d. The number of oxygen atom per molecule of C₈H₁₄N₂O₂ = 2 oxygen atoms

The number molecules of C₈H₁₄N₂O₂ in 15 mg of C₈H₁₄N₂O₂ = 8.423 × 10¹⁹ molecules

Therefore;

The number of oxygen atom per 15 mg of C₈H₁₄N₂O₂ = 2 × 8.423 × 10¹⁹  oxygen atoms

The number of oxygen atom per 15 mg of C₈H₁₄N₂O₂  = 1.685 × 10²⁰ atoms of oxygen

e. The number of nitrogen atoms are equal to the number of oxygen atoms per molecule of C₈H₁₄N₂O₂, therefore;

The number of nitrogen atoms = 1.685 × 10²⁰ atoms of nitrogen.

Answer:

Nickel has an atomic number of 28,so it has 28 electrons

Nickel has 10 valence electrons

Answer: 16

Explanation:

Answer:

The percent composition for nitrogen in chromium(III) nitrate is 6%.

The mass percentage of nitrogen in chromium (III) nitrate. The percent composition for nitrogen in chromium(III) nitrate is 6%.

A bulk of earth's atmosphere is occupied by nitrogen that is 78.1 percent by volume, it is inert at standard temperature and pressure condition called as azote, is a crucial part of food and fertilizer production.

Nitrogen gas or N is nonmetallic, colorless, odorless and tasteless gas,  atomic number is 7 and atomic weight of 14.0067, its density of 1.251 grams/liter at 0 degree C ,  its specific gravity of 0.96737.

Nitrogen gas is used in industrial and production due to its abundance and nonreactivity, nitrogen gas be used in extinguish fires, the oxygen or moisture sensitive substances like Iron, steel and electronic components, are produced in a nitrogen atmosphere.

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Answer:

An atom

Explanation:

An atom is the basic unit of a chemical element. Atoms are made out of three main parts: protons, neutrons and electrons.

Answer:

Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. It is only these collisions (possessing at least the activation energy for the reaction) which result in a reaction

Explanation:

When we increase the temperature of one of the reactants in a chemical reaction, this increases the particles kinetic energy, making them move much faster than they were before. This also increases the chance of a more successful collision and the rate of reaction.

Answer:

polar covalent bonds

Explanation:

Phosphorus trichloride is a chemical compound of phosphorus and chlorine, having the chemical formula PCl 3. It has a trigonal pyramidal shape, owing to the lone pairs of electrons on the phosphorus atom.

Chlorine is more elctronegative than phosphorus . Phosphorus has a lone pair of electrons and every chlorine atom has three pairs of electrons . The molecule is not symmetrical as the shared electron pairs are closer to the chlorine atoms than the phosphorus atoms , the chlorine atoms are shifted towards one side of the center of the molecule , thus a net dipole effect is created. This is the reason why the molecule is polar .

Answer:

6 CH2O which is C₆H₁₂O₆

Explanation:

The empirical formula for glucose is CH2). The molar mass of glucose is 180.2 grams per mole. Determine the molecular formula of glucose.

Formula: C₆H₁₂O₆

Empirical Formula is CH2O

Molecular Molar Mass is 180.20g/mole

Empirical Molar Mass is 30.02 g/mole

molecular formula of glucose is C₆H₁₂O₆

n = 180.20/30.02=6

n×(CH2O)

where n = molecular molar mass / empirical molar mass

So we end up with 6 CH2O which is C₆H₁₂O₆

Answer:

A. 10.74 KJ

B. 83.92 KJ

Explanation:

A. Data obtained from the question include the following:

Mass (m) of ethanol = 100g

Heat of fusion, Hfus = 4.94 kJ/mol

Heat (Q) =..?

Next, we shall determine the number of mole in 100g of ethanol, C2H5OH. This is illustrated below:

Mass of C2H5OH = 100g

Molar mass of C2H5OH = (2x12)+ (5x1) + 16 + 1 = 46g/mol

Number of mole (n) of C2H5OH =..?

Mole = Mass /Molar Mass

Number of mole (n) of C2H5OH = 100/46 = 2.174 moles.

Now, we can obtain the heat required to melt the ethanol as follow:

Q = n x Hfus

Q = 2.174 mol x 4.94 kJ/mol

Q = 10.74KJ

Therefore, 10.74 KJ of heat is required to melt the ethanol.

B. Data obtained from the question include the following:

Mass of C2H5OH = 100g

Heat of vaporisation, Hvap = 38.6 kJ/mol

Heat (Q) =..?

As calculated above, the number of mole in 100g of ethanol, C2H5OH is 2.174 moles.

The heat required to vaporise the ethanol can be obtained as follow:

Q = n x Hvap

Q = 2.174 mol x 38.6 kJ/mol

Q = 83.92 KJ

Therefore, 83.92 KJ of heat is required to vaporise the ethanol.

C. From the above calculations, a higher amount of heat energy i.e 83.92 KJ is required to vaporise the ethanol and a lesser amount of heat energy i.e 10.74 KJ is needed to melt the ethanol.

The heat required for the following two processes are:

a. 10.74 KJ

b. 83.92 KJ

Part a)

Given:

Mass (m) of ethanol = 100g

Heat of fusion, Hfus = 4.94 kJ/mol

To find:

Heat (Q) =?

Mass of C₂H₅OH = 100g

Molar mass of C₂H₅OH = (2x12)+ (5x1) + 16 + 1 = 46g/mol

Number of Mole = Mass /Molar Mass

Number of mole (n) of C₂H₅OH = 100/46 = 2.174 moles.

Calculation for Heat of fusion:

Q = n x Hfus

Q = 2.174 mol x 4.94 kJ/mol

Q = 10.74KJ

Therefore, 10.74 KJ of heat is required to melt the ethanol.

Part b)

Given:

Mass of C₂H₅OH = 100g

Heat of vaporization, Hvap = 38.6 kJ/mol

To find:

Heat (Q) =?

Calculation for Heat of vaporization:

As calculated above, the number of mole in 100g of ethanol, C₂H₅OH is 2.174 moles.

The heat required to vaporize the ethanol can be obtained as follow:

Q = n x Hvap

Q = 2.174 mol x 38.6 kJ/mol

Q = 83.92 KJ

Therefore, 83.92 KJ of heat is required to vaporize the ethanol.

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Answer:

Neutral

Explanation:

1 Mole OH-  = Hard Base

1 mole H3O+ = Hard Acid

2 H2O(l) ⇆ H3O+ (aq) + OH- (aq)

HSAB

Soft acids react fastest and form the strongest bonds with soft bases

Hard acids react fastest and form the strongest bonds with Hard bases

Resulting solution is definitely not non-polar as the result is H2O which is polar.

Acid:  A solution that has an excess of H+ ions

Base: A solution that has an excess of OH- ions.

H2O is neutral because the concentration of hydrogen and hydroxide ions is the same.

Answer:

0.15M

Explanation:

NaOH + HCl -->NaCl + H2O

moles of NaOH reacted with HCl

(0.5 × 30)/1000 = 1.5 × 10^ -3

so the moles of HCl reacted with NaOH

1.5 × 10^ -3

concentration of HCl = ( 1.5 × 10^ -3)/10 ×1000

Answer:

Light

Explanation:

All  of  the  other  conditions  are  the  same.  As  an  example  the  amount  of  water  which  sally  apply  to  each  plant  is  the  same.  So  the  independent

 variable  that  she  is  experiment  on  is  the  effects  of  different  kinda  lights  on  the  growth  of  the  bean  plants

The source of light is the independent variable in the experiment of how the type of light affects the height of bean plants.

The independent variable is the variable that cannot be influenced or disturbed by the effect of the other factors or the characteristics of another thing present in the system.

In the experiment on how the type of light affects the height of bean plants, the light source LED, incandescent, and CFL have their own characteristics and cannot be affected by anything in the environment.

Therefore, in the experiment on how the type of light affects the height of bean plants, the source of light is the independent variable.

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Answer:

Ebola is a rare but deadly virus that causes fever, body aches, and diarrhea, and sometimes bleeding inside and outside the body. As the virus spreads through the body, it damages the immune system and organs. Ultimately, it causes levels of blood-clotting cells to drop. This leads to severe, uncontrollable bleeding.

Explanation: