A rock occupies a volume of 20 cm3 and has a mass of 54 grams. Find the density of this rock

Answer:

Ships traveling through the ocean

Answer:

the answer for this must be d

Answer:

music comes out of a TV speaker

Explanation:

the other choices do create sound, but not from electricity

Answer:

As ozone is tri-atomic molecule, made up of the 3 O-atoms, hence, as all atoms are same. Ozone has coordinate bond hence these can not form the ionic compound. While all others are ionic compound.

Answer:

Explanation:

Ionic bonds are not formed by atoms that find it difficult to obtain or lose electrons from their outermost orbit.

Example: silicon and carbon.

Answer: [Kr] 5s24d10 is the element Cadmium, Cd. It has 48 electrons.

Answer:

Empirical Formula ClHgO3 Mercurous Chlorate

Explanation:

Cl=12.48% Hg=70.62% O=16.9%

CIF will tend to increase as the reaction proceeds toward equilibrium.

Given that Kp is equal to 20 at 2500 K, we can calculate the initial concentrations of CIF using the ideal gas law. Let's assume the initial volume is 1 liter for simplicity.

For Cl2:

P(Cl2) = 0.18 atm

n(Cl2) = P(Cl2) * V / (RT) = 0.18 mol

For F2:

P(F2) = 0.31 atm

n(F2) = P(F2) * V / (RT) = 0.31 mol

For CIF:

P(CIF) = 0.92 atm

n(CIF) = P(CIF) * V / (RT) = 0.92 mol

Based on the balanced equation, for every 1 mole of CIF, 1 mole of Cl2 and 1 mole of F2 are consumed. Therefore, the initial moles of CIF are equal to the initial moles of Cl2 and F2.

Since the initial concentrations of CIF, Cl2, and F2 are the same, and the reaction is not at equilibrium, we can conclude that CIF will tend to increase as the reaction proceeds toward equilibrium. This is because the reaction favors the formation of CIF, as indicated by the value of Kp. As CIF forms, the concentrations of Cl2 and F2 decrease, driving the reaction in the forward direction to restore equilibrium.

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Answer:

T

=

447

K

≈

174

∘

C

.

Explanation:

This is what we're given:

P

(pressure), which is

1.95 atm

.

V

(volume), which is

12.30 L

.

n

(number of moles), which is

0.654

moles of neon gas.

We have to find

T

, or temperature. To do this, we'll need to use the Ideal Gas Law, which is:

P

V

=

n

R

T

Rearranging this equation to get temperature on one side, we get:

T

=

P

V

n

R

Pressure is in

a

t

m

and volume is in

L

. This tells us that we'll need to use the value of

0.08206 L atm/K mol

for

R

, the ideal gas constant.

Plugging in all of the values, we can solve for temperature:

T

=

p

V

n

R

T

=

1.95

atm

×

12.30

L

0.654

mol

×

0.08206

L

atm

K

−

1

mol

T

=

447

K

We can then convert to celsius, which equals to around

174

∘

C

.

Answer link

Explanation:

The final concentration after dilution is 8.15 PFU/mL.

To calculate the final concentration of PFU/mL after dilution, you can use the formula:

C₁V₁= C₂V₂

Where C₁ is the initial concentration, V₂ is the initial volume, C₂ is the final concentration, and V₂ is the final volume.

In this case:

C₁= 163 PFU/mL (initial concentration)

V₁ = 1.0 mL (initial volume)

V₂ = 20.0 mL (final volume; 1.0 mL of original solution + 19.0 mL of diluent)

Now, we can solve for C₂ (final concentration):

163 PFU/mL * 1.0 mL = C₂ * 20.0 mL

C₂ = (163 PFU/mL * 1.0 mL) / 20.0 mL

C₂ = 163 / 20

C₂ = 8.15 PFU/mL

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Mass of water produced : 0.146 g

Given

33.2 mL of 0.245 M lithium hydroxide

Required

mass of water

Solution

Reaction

HNO₃ (aq) + LiOH (aq) → H₂O (l) + LiNO₃ (aq)

mol LiOH :

= M x V

= 0.245 x 33.2 ml

= 8.134 mmol

From the equation, the mol ratio of HNO₃ : H₂O = 1 : 1, so mol H₂O = 8.134 mmol

mass H₂O :

= mol x MW

= 8.134 x 10⁻³ mol x 18 g/mol

= 0.146 g

A series of chemical changes called metabolic pathways are enzyme-catalyzed reactions that occur in a specific sequence.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.

There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

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Answer:

this is what i know

Explanation:

Molecules or ions of a solute spread throughout the water molecules

The molar mass of the unknown acid is 181 g/mol. The correct answer is E.

The molar mass of the unknown can be calculated using the formula:

Here, M represents the molarity of NaOH, V represents the volume of NaOH, and n represents the number of moles of the unknown acid.

To calculate the number of moles of NaOH used, we use the formula:

Here, M represents the molarity of NaOH and V represents the volume of NaOH. We know the volume of NaOH, which is 19.7 mL, and the molarity of NaOH, which is 1.00 M.

Therefore, n = (1.00 M) × (19.7 mL) = 0.0197 moles of NaOH used.

Now we need to find the number of moles of the unknown acid that was used. The balanced chemical equation for the reaction between the acid and NaOH is:

Therefore, the number of moles of OH- ions used is equal to the number of moles of NaOH used. Also, the number of moles of H+ ions in the acid is equal to the number of moles of OH- ions used, since they react in a 1:1 ratio.

Therefore, the number of moles of the unknown acid used is also 0.0197 moles.

To find the molar mass of the unknown acid, we use the formula:

Here, m represents the mass of the acid and n represents the number of moles of the acid.

We know the mass of the acid, which is 3.56 grams, and the number of moles of the acid, which is 0.0197 moles. Therefore,

So the molar mass of the unknown is approximately 181 g/mol.

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We must determine how much water should be added to the 45 mL of 3.5 M sodium sulphate solution in order to get the answer to this query. The calculation's equation is as follows: Water volume (Vw) is equal to (C1V1 - C2V2)/C2.

Where C1 = the original solution's concentration (3.5 M). V1 is the amount of the initial solution (45 mL). C2 = 0.8 M, the required solution's concentration V2 denotes the intended solution's volume (unknown). When we enter the values, we obtain: V2 = 196.875 - Vw Vw = (3.5 x 45 - 0.8 x V2)/0.8 Vw = (157.5 - 0.8V2)/0.8 .

Consequently, the amount of water (Vw) that must be added to 45 mL of 3.5 M sodium sulphate solution in order to create a solution with a 0.80 sodium ion concentration is 196.875 mL - Vw.

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The pressure in the burette if the atmospheric pressure in the room at that time was 765.0 torr is 915 torr

The pressure in the burette can be obtained by using the following formula:

Pressure of gas = Atmospheric presure + pressure due to height

With the above formula, we can determine the pressure in the burette. This is illustrated below:

Pressure in burette = Atmospheric presure + pressure due to height

Pressure in burette = 765.0 + 150

Pressure in burette = 915 torr

Thus, the pressure in burette is 915 torr

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Answer:

Density, mass of a unit volume of a material substance. The formula for density is d = M/V, where d is density, M is mass, and V is volume.

Explanation:

Hopefully that helped:/

Answer: Density, mass of a unit volume of a material substance. Hope this helps!

Answer:

c i think

Explanation:

Lithium levels be carefully monitored in individuals who take this medication if levels are too high, you may experience lithium toxicity

The lightest of the solid elements is lithium (Li), an element belonging to Group 1 (Ia) of the periodic table. A number of its alloys and compounds, as well as the soft, white, and lustrous metal itself, are produced on an industrial scale. By electrolyzing a fused mixture of lithium and potassium chlorides, lithium metal is created. Lower-temperature operation of the electrolysis is made possible by the mixture's lower melting point (400-420 °C, or 750-790 °F) compared to that of pure lithium chloride (610 °C, or 1,130 °F). Lithium is deposited at a purity level higher than 97 percent because the voltage at which decomposition of lithium chloride occurs is lower than that of potassium chloride. Lithium is produced electrolytically using graphite anodes.

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Answer:

You can model a substance doing a Lewis structure

And also you can model it doing a bond-line structure.

"There is not enough oxygen in space to support life," is the right response.

The short answer is that oxygen is brought from Earth by astronauts and cosmonauts (a Russian astronaut), and that oxygen is created by passing electricity through water. (this is called electrolysis). On the Space Station, both the air and the water were initially imported from Earth.

Typically, astronauts restrict their bodies in a small sleeping compartment or sleeping bag while they are sleeping. Since there is nearly no gravity in space, there is no such thing as up or down like there is on earth. Astronauts are able to sleep anyplace since any surface can serve as a floor, wall, or ceiling.

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Answer:

B

Explanation:

Edge 2020

Answer:

B babeeeeeeeeeeeeee

Explanation:

Answer:

Explanation:Destructive interference occurs when the maxima of two waves are 180 degrees out of phase: a positive displacement of one wave is cancelled exactly by a negative displacement of the other wave. The amplitude of the resulting wave is zero.

If two waves that are completely out phase if meet they results in destructive interference. Hence, their intensities decreases for the resultant wave.

A wave of greater, lower, or the same amplitude is created when two waves merge through interference by combining their displacements at all points in space and time.

The interaction of waves that are coherent or correlated with one another, either because they originate from the same source or because their frequencies are similar or almost identical, leads to both constructive and destructive interference.

All sorts of waves, including light, radio, acoustic, surface water waves, gravity waves, and matter waves, can exhibit interference effects. In constructive interference, the waves are in single phase forms a resultant wave with higher amplitude.

When waves from out of phase meets, the resultant wave will have an amplitude less than the individual amplitudes.

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Answer:

a) both their average kinetic energy and temperature will be the same

Explanation:

Temperature is the measure of the average kinetic energy of a system. As temperature increases, so will kinetic energy. As kinetic energy increases, speed increases. As one decreases, so does the other. When two objects are in contact with each other, their molecules will exchange energy and cause an eventual equilibrium of temperature and kinetic energy.

Answer: Answer is below <3

Explanation: A mutant protein is the protein product encoded by a gene with mutation. Mutated protein can have single amino acid change (minor, but still in many cases significant change leading to disease) or wide-range amino acid changes by e.g. truncation of C-terminus after introducing premature stop codon.

A number of mutant proteins, including huntingtin, atrophin1, the androgen receptor, ataxin1, ataxin2, ataxin3, alpha 1A subunit of the Cav2.

The answer is B) 6.6 x 10^ (-3) moles. To determine the number of moles of H2O, we need to use Avogadro's number.

Avogadro's number, approximately 6.022 x 10^23, represents the number of particles (atoms, molecules) in one mole of a substance. Moles represent a specific quantity of a substance, allowing for consistent comparisons and calculations in chemistry.

In this case, we have 4.0 x 10^21 molecules of water.

To find the number of moles, we divide the number of molecules by Avogadro's number:

Number of moles = (Number of molecules) / (Avogadro's number)

Number of moles = (4.0 x 10^21) / (6.022 x 10^23)

Calculating this gives us approximately 6.633 x 10^(-3) moles.

Therefore, the answer is B) 6.6 x 10^ (-3) moles.

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Answer:

by moving between defined energy levels

Explanation:

49.31 + 43.79 = 93.10

finding the percentage of hydrogen in the compound hence 100-93.10 =6.9

therefore 6.9 percent of hydrogen is present in the compound

assuming that the compound is in 100 g so the elements present would be 49.31g of C , 43.79g of O and 6.9g of H

no. of moles of C = given mass÷molar mass

= 49.31 ÷ 12

=4.11 mol

no of moles of O = givem mass ÷molar mass

=43.79÷ 16

=2.73 mol

no. of moles of H =6.9÷1

=6.9 mol

dividing the no. of moles of each element by the least count of the elemnt to get the ratio of the simple whole numbr

therefore

so by dividing we get 1:1:2 of C:O:H

the empirical formula is CH2O

empirical formula mass of CH2O IS

= (12)+(2×1)+(16)

= 12+2+16

=30 G/MOL

n= molar mass of the compound ÷ empirical formula mass of the compound

so, n= 146.1 ÷30

n=5

molecular formula = n×empirical formula

molecular formula= 5×CH2O

molecular formula=C5H10O5 (ribose is the compound)

a) The sphere emits thermal radiation at a rate of 139.75 Watts.

b) The sphere absorbs thermal radiation at a rate of 37.66 Watts.

c) The sphere's net rate of energy exchange is 102.09 Watts.

To calculate the rates of thermal radiation emission and absorption, we can use the Stefan-Boltzmann law, which states that the rate of thermal radiation emitted or absorbed by an object is proportional to its surface area, temperature, and the Stefan-Boltzmann constant.

a) The rate of thermal radiation emitted by the sphere can be calculated using the formula:

Emitting Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(temperature^4 - environment\ temperature^4\))

Plugging in the given values:

Emitting Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((32.2 + 273.15)^4 - (82.9 + 273.15)^4)\)

Emitting Rate ≈ 139.75 Watts

b) The rate of thermal radiation absorbed by the sphere can be calculated in a similar way but using the environment temperature as the object's temperature:

Absorbing Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(environment\ temperature^4 - temperature^4\))

Plugging in the given values:

Absorbing Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((82.9 + 273.15)^4 - (32.2 + 273.15)^4)\)

Absorbing Rate ≈ 37.66 Watts

c) The net rate of energy exchange is the difference between the emitting rate and the absorbing rate:

Net Rate = Emitting Rate - Absorbing Rate

Net Rate = 139.75 Watts - 37.66 Watts

Net Rate ≈ 102.09 Watts

Therefore, the sphere emits thermal radiation at a rate of 139.75 Watts, absorbs thermal radiation at a rate of 37.66 Watts, and has a net rate of energy exchange of 102.09 Watts.

Note: The units for all the rates are Watts.

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Answer:

1. Objective

2. Objective

3. Opinion

4. Objective

5. Opinion

6. Opinion

7. Opinion (I think.)

8. Opinion (I think.)

Explanation:

Answer:

The activated state

Explanation:

The activated state is the "highest energy of the chemicals as they proceed through a reaction". Therefore, they would be the highest point on the graph, since they are the highest energy level. The activated state can also represent the products or the reactants, dependent on the type of reaction. Hope this helps!

The part of an energy graph that is represented by the highest point is known as the activated state.

In conclusion, the part of an energy graph that is represented by the highest point is known as the activated state.

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Answer:

40

Correct option is A)

3dm

3

×

24 dm

3

1 mole

​

=0.125 moles of O

2

​

2H

2

​

O

2

​

⟶2H

2

​

O+O

2

​

2 moles of H

2

​

O

2

​

 produces 1 mole of O

2

​

.

0.125 moles of O

2

​

 requires 2×0.125 H

2

​

O

2

​

=0.25 moles of H

2

​

O

2

​

Concentration of H

2

​

O

2

​

=

0.1

0.25

​

=2.5 M

Hence, option A is correct.

Explanation: