3. In the metric unit nanometer, "nano" is the base unit.
a. TRUE
b. FALSE

By converting the 400 nm wavelength of violet light into meters we are get 4.0.10^-7.

What is wavelength?

wavelength can be defined as the distance between two successive crests or throughs of a wave. It is measured in the direction of the wave.

The wavelength of light defined as the distance between the two successive crests or throughs of the light wave.

The wavelength of light is the distance between corresponding point in two adjacent light cycles and the frequency.

Convert the unit for 400nm-

4.0.10^-7

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Answer:

q = mC∆T

m = mass = 25 ml CaCl2 + 25 ml KF = 50 ml x 1.00 g/ml = 50 g

C = 4.184 J/g-deg

∆T = 1.7 deg

q = (50 g)(4.184 J/g-deg)(1.7 deg) = 355.6 J

Looking at the chemical reaction: CaCl2(aq) + 2KF(aq) ==> CaF2(s) + 2KCl(aq)

moles CaCl2 present = 0.025 L x 1.00 mol/L = 0.025 mol CaCl2

moles KF = 0.025 L x 2.00 mol/L = 0.05 mol KF

Neither reactant is limiting as they are both present in stoichiometric quantities. Thus, moles CaF2 formed will be 0.025 moles CaF2 formed.

∆Hppt = 355.6 J/0.025 moles = 14,224 J/mole = 14.2 kJ/mole

The composition of the saturated liquid is 2571.428g.

The maximum concentration of a solute that can be dissolved in a solvent without forming a solute-rich secondary phase. Basically, lowering the temperature of a saturated solution, or cooling it, reduces the solubility of the solute. It will begin to form crystals and settle to the bottom of the container or jar. This creates a supersaturated solution.

Sugar dissolves faster in hot water than in cold water. This is because hot water has more energy than cold water. When water is heated, the molecules gain energy and move faster. They move faster, so they come into contact with sugar more often and dissolve faster. Solubility indicates the maximum amount of a substance that can be dissolved in a solvent at a given temperature. Such a solution is called saturated.

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Answer:

the answer is c..................

When ice melts to liquid form, oits potential energy decreases. As its melts the movement of particles increases thus, kinetic energy starts to increase.

Potential energy of an object is the energy generated by virtue of its motion whereas, kinetic energy is generated by the motion of the object. Together they are called mechanical energy of the object.

The melting point of a substance is the temperature at which it converts from its solid state to liquid state. This physical process needs energy to weaken the intermolecular forces of attraction between the particles.

Thus, when ice melts to water, the particle -particle force decreases leading to enough space to move and they gains a kinetic energy. Therefore, its potential energy decreases.

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The wavelength for transition in  hydrogen atom is 397 nm.

1/wavelength = RH[(1/n12 )-(1/n22)]

Here RH= Rydberg constant = 109,677 cm-1

n1= 2

n2= 7

Substituting these values in the Rydberg formula we get

1/wavelength = 109,677cm-1[(1/2^2)-(1/7^2)]

1/wavelength = 109,677cm-1[(1/4)-(1/49)]

1/wavelength= 109,677cm-1[(49-4)/(49*4)]

Wavelength=( 49*4)/(45*109677) cm

Wavelength = 3.97*10^-5 cm

Wavelength= 397*10^-9 m

Wavelength= 397 nm.

Solve for the electron energy in the n = 7 plane of the hydrogen atom. So the soul you have is E equal to 13.6 divided by N square hoops. Here's an E.V that ends with a 7. All lines with a final energy level of n = 2 form a Balmer series. Going from n=5 to n=2 gives the third row of the Balmer series.

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Answer:

Chlorophyll.

Explanation:

Chlorophyll is also why plants are green.

Pls mark brainliest with the crown

Chloroplasts are the food producers of the cell. The organelles are only found in plant cells and some protists such as algae. Animal cells do not have chloroplasts. Chloroplasts work to convert light energy of the Sun into sugars that can be used by cells.

:)

The concentration of HCl is found to be 1.062M from the titration reaction.

Titration is a standard quantitative chemical analysis laboratory method for determining the concentration of a specified analyte. The titrant or titrator is a reagent that is produced as a standard solution of known concentration and volume. Titration is the constant addition of a known concentration solution (referred to as a titrant) to a known volume of a solution an unknown concentration until the reaction approaches equilibrium, which is indicated by a change in color.

Given:

V1 = 44.27mL

C1 = 0.120M

V2 = 5.00mL

To find:

C2 = ?

Formula:

V1C1 = V2C2

Calculations:

C2 = V1C1 / V2

C2 = 44.27 x 0.120 / 5

C2 = 5.3124 / 5

C2 = 1.062M

Result:

The concentration of HCl is found to be 1.062M

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Answer:

D. Cs, Na, K

Explanation:

Elements in the same column of the Periodic Table have similar chemical properties.

Answer:

d) Cs, Na, K

Explanation:

The vertical columns on the periodic table are called groups or families because of their similar chemical behavior.  Cs, Na, and K are all in the same vertical column (which is called Group IA or the alkali metals).

The mass of the tin and oxygen gas taken for the reaction was 54 grams and 14.66 grams​ respectively.

The tin(IV) oxide or stannic oxide, has the formula SnO₂. Tin metal is burned in the air to form tin(IV) oxide.  In a reverberatory furnace, SnO₂ is reduced to metal with carbon at 1200–1300 °C.

Tin(iv) oxide is a crystalline solid that is white and sublime at 1800-1900°C. The melting point of tin(IV) oxide is 1127°C and its density is 6.95 g/cm³.

Tin and oxygen react with each other to generate tin(IV) oxide SnO₂.

Sn (s)   +   O₂ (g)  [tex]\longrightarrow[/tex]   SnO₂(s)

The atomic mass of the tin (Sn) = 118.71 g/mol

The molecular mass of oxygen gas (O₂) = 32 g/mol

The molar mass of the tin(IV) oxide = 150.71 g/mol

Given, the mass of the tin(IV) oxide formed = 68.6 g

If  150.71 g tin(IV) oxide formed from tin =  118.71 g

Then 68.6 g tin(IV) oxide will be formed from Sn = 54 g

If  150.71 g tin(IV) oxide formed from oxygen = 32 g

68.6 g will be formed from oxygen = (32× 68.6)/150.71 g = 14.66 g

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According to the law of conservation of momentum and energy, 28.4% of the kinetic energy from the neutron is transferred to the nucleus of the carbon during the elastic collision.

In elastic collisions, momentum and kinetic energy are both preserved. Imagine two trolleys that resemble one another moving in the same direction at the same pace. They clash, maintaining their speed as they bounce off one another. The fact that no energy has been wasted makes this collision fully elastic.

The rules of energy and momentum conservation are some of the most significant and practical ideas in physics. According to the principle of conservation of momentum, the overall momentum of a system of bodies remains constant no matter what external forces are present (it is conserved). The total energy is also a constant if all forces, internal or external, can be described by a potential; this is the law of conservation of energy.

Using the conservation of momentum and energy,

For two particles with mass m1 and m2, initial velocities i1 and i2 undergo a perfectly elastic head-on collision, you can find the after- collision velocities from [1]:

v1 = (i1 x (m1 - m2) + 2 x m2 x i2) / (m1 + m2)

v2 = (i2 x (m2 - m1) + 2 x m1 x i1) / (m1 + m2)

Let 1 denote the proton and 2 the nucleus.

Since the nucleus was initially at rest, i.e. i2=0, the velocity of the nucleus after the collision is:

v2 = 2 x m1x i1 / (m1 + m2) = 2 x i1 / (1 + (m2/m1))

Therefore, the kinetic energy of the nucleus after the collision:

E2' = (1/2) x m2 x v2² = 2 x m2 x i1² / (1 + (m2/m1))²

The fraction of the neutrons kinetic energy transferred to the nucleus:

f = E2 '/ E1

f = [2 x m2 x i1²/(1 + (m2/m1))² ] / [ (1/2) x m1 x i1²)]

f = 4 x (m2/m1) / (1 + (m2/m1))²

f = 4 x 12 / (1 + 12)²

f = 0.284

f = 28.4%

Result:

28.4% of the neutron’s kinetic energy is transferred to the nucleus of the carbon.

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The mass of the 6.63  × 10²¹ atoms of Arsenic is equal to 0.825 grams.

The Avogadro constant can be described as the proportionality factor which is the number of constituent components such as atoms, molecules, or ions in one mole of a substance.

Avogadro's number has a numeric value of 6.022 × 10²³ reciprocal moles.

Given, the mass of one mole of the Arsenic = 74.92 g

The number of atoms of Arsenic is given = 6.63  × 10²¹

One mole of  Arsenic has atoms  = 6.022 × 10²³

The 6.022 × 10²³ atoms of Arsenic have mass = 74.92 g

Then  6.63  × 10²¹ atoms of the Arsenic will have mass :

=   6.63  × 10²¹ × 74.92/6.022 × 10²³

= 0.825 g

Therefore, the mass of the 6.63  × 10²¹ atoms of Arsenic is 0.825 grams.

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The precipitate is iron(II) carbonate based on the solubility of all possible cation and anion combinations and based on its molar mass, 11.6g of it will precipitate.

All the potassium salts and sodium salts except sodium bicarbonate are soluble in water, therefore the precipitate is the iron(II) salt. Iron(II) bromide is soluble in water, on the other hand, iron(II) carbonate is not water-soluble. Therefore iron(II) carbonate will precipitate.

According to the given data, we have;

0.100 L × 1.5 M = 0.15 moles of carbonate ions

0.100 L × 10. M = 0.1 moles of iron(II) ions

As they react in a 1:1 ratio, there is an excess of the carbonate ions and 0.1 moles of Iron(II) will precipitate.

Now by using the molar mass, the mass of the precipitate can be calculated as follows;

M = (56 + 12 + 3 × 16) g/mol

M = 116 g/mol

n = m ÷ M

m = M × n

m = 116 g/mol × 0.1 mole

m = 11.6 g

Therefore, iron(II) carbonate is the precipitate and the mass of this insoluble product is calculated to be 11.6 g.

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Oxygen forms two bonds and the configuration is 1s₂ 2s₂ 2p₄, Phosphorus forms three bonds and the configuration is [Ne]3s₂ 3p₃, and Galium forms four bonds and the configuration is [Ar] 3d₁₀ 4s₂ 4p₁

Therefore,

Oxygen forms two bonds and the configuration is 1s₂ 2s₂ 2p₄

Phosphorus forms three bonds and the configuration is [Ne]3s₂ 3p₃

Galium forms four bonds and the configuration is [Ar] 3d₁₀ 4s₂ 4p₁

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The motion of that I had today is a constant motion in a bus that does not change speed.

The term motion has to do with the change in the position of a body with time. Now we know that when there is motion, the motion could occur in many different ways.

Today, I got on a bus on my way to school. This bus was moving at a constant speed. The speed of the bus never changed. We can say that the bus had a zero acceleration since the speed of the bus did not change through out the journey.

As such, the graph of the motion would have a flat horizontal line across the x axis.

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Distillation would be used to separate the mixture of two liquids having boiling points of  45°C and 86°C.

Separating the component substances from a liquid mixture by evaporation and condensation is called as distillation. It is one of the most common techniques for the purification and identification of organic liquids.

Distillation is used for separating a mixture of miscible liquids into its components and when the difference in the boiling points of the liquid is more than 20-25 degree Celsius. It is a physical process as it involves phase change from liquid to gas.

Following are the steps involved in distillation:

1. Converting desired liquid from a mixture into vapor.

2. Condensing the liquid that is purified.

3. Finally, collecting the condensed liquid

There are four types of distillation namely, Fractional, simple, Vacuum and Steam Distillation.

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The primary difference between alcohol fermentation in yeast and lactic acid fermentation in muscle cells is that alcohol fermentation in yeast produces ethanol and carbon dioxide, while lactic acid fermentation in muscle cells produces lactic acid. 

Yeast cells produce ethanol and carbon dioxide through the process of alcoholic fermentation. This process begins when yeast cells consume glucose. The yeast cells convert the glucose into pyruvate, and then the pyruvate is converted into ethanol and carbon dioxide. Lactic acid fermentation takes place in muscle cells when they do not have enough oxygen to produce energy aerobically. In this process, the muscle cells convert pyruvate into lactic acid. Lactic acid is then used by the cells to produce energy.

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Replicated chromosomes split into two new nuclei during the mitotic cell cycle phase, which is referred to in cell biology. With a fixed number of chromosomes, genetically identical cells are produced during the cell division process known as mitosis. As a result, mitosis is also known as equational division.

Meiosis is a unique form of germ cell division that creates gametes, such as sperm or egg cells, in sexually reproducing animals. In the end, four cells with just one copy of each chromosome are produced after two rounds of division.

Meiosis creates cells that are genetically distinct from the parent and have half as much DNA as mitosis, which divides a single "parent" cell into two genetically identical "daughter" cells. Most cells in the body go through mitosis on a regular basis, however some do so more frequently than others.

Meiosis results in genetic variety because of crossing over and independent assortment while mitosis produces identical cells for the mother cell and each daughter cell. Meiosis produces cells with half as many chromosomes as the mother cell, while mitosis produces nuclei with the same amount as the mother cell.

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Answer:26.2 grams

Explanation:We have 58.93 grams per mole cover so from here we'll be able to cancel moles of coat, and the remaining unit in the numerator will be gram which is our desired unit and then multiplying these 2 numbers 0.445 multiplied by 58.93. We should get 26.2 grams.

Volume required is 41.625 ml of 0.20M NaOH must be added to the 20 ml of 5%. acetic acid solution to bring the pH to 4.74.

Solution -

Step 1: To calculate molarity of acetic acid in100 mL of solution

Molar mass of acetic acid  = 60.0591 mol

No. of moles of acetic acid = mass of acetic acid ÷Molar mass of acetic acid

=5g÷60.05g/mol

moles of acetic acid 0.08326 mol

Molarity of acetic acid =moles of acetic acid/ Vol of sol" (in L)

                                        =0.08326 mol/L÷0.1L

                                    =0.8326mol/L

Molarity of 20 mL of 5% acetic acid solution = (20 mL) x 0.8326 mol /L

                                                                       = 0.01665 mol/L

Step 2 :To calculate volume of 0.20 M NaOH required.

Let 'v' liters of 0.20 M NaOH was added to the acetic acid solution.

New Molarity of NaOH, x = (V x 0·20) M -equation (1)

Given: pH=4.74 ,pka=4.74

Henderson-Hasselbalch equation is:

[tex]pH = pK_a + log10([A^-] / [HA])[/tex]

[A⁻] = conjugate base

[HA] = acid

               Acetic acid + NaOH → Sodium acetate + H2O

Initial      0.01665 M        xM             0 M

change      -x                   -x                 +x

Final        0.01665-x          0                 xM

pH=pK a +log [Sodium acetate] [acetic acid]

4 * 74 = 4 * 74 + log(x/(0.01665 - x))

0 = log(x/(0.01665 - x))

Taking antilog both

[antilog (0) = 1]

1 = x / 0.016C5-x

0.01665 - x = x

x = 0.008325 M

New So, Molarity of NaOH = 0.008325 M

From equation (1).

New Molarity of NaOH = V ×0.20M

=0.008325 V × 0.20

V= 0.041625 L

V= 41.625 mL

Thus the volume will be V= 41.625 mL

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4.40 L of a gas is collected at 323 K. The volume of this gas upon cooling to 298 K will be

To calculate the volume upon cooling, we will use the Charles law.

Charles law states that, Volume and the temperature of a gas are directly proportional to each other if there is a fixed amount of gas present at a fixed amount of pressure.

This law is given as -

V ∝ T

V/T = constant.

where,

V = volume

T = temperature

Using this equation, we will find the new volume -

substituting values -

V₁ = V₂

T₁    T₂

4.40 = V₂  

323      298

V₂ = 4.40 x 298

             323

V₂ = 4.05 L

Therefore, the new volume upon cooling will be 4.05 L.

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Explanation:

A reaction at equilibrium essentially means that the number of reactants and products is constant (but not necessarily equal) and continue to be constant until a change is imposed on the system.

By looking at a nuclear reaction, a fission reaction can be easily identified as it shows the breakdown of a larger atom into two or more smaller nuclei.

it is the formation of one or more new nuclides by the collision of two nuclei or external subatomic particles. Nuclear reactions are of two types:

In nuclear fission reaction, a heavier nucleus splits into several smaller lighter nuclei fragments and two or more neutrons. These fragments, or fission products, are either equal to or half of the original mass of the atom The reaction proceeds with a very high emission of energy.

[tex]238_{92}[/tex]U → [tex]234_{90}[/tex]Th + [tex]4_{2}[/tex][tex]\alpha[/tex]

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All of th Earth's water reservoirs connected to the ocean by the processes of evaporation and precipitation.

Evaporation and precipitation processes link the ocean to all of the earth's water reservoirs, making it a crucial component of the water cycle.

Due to the fact that all significant watersheds on Earth drain to the ocean, the ocean is linked to significant lakes, watersheds, and streams. From watersheds to estuaries and the ocean, rivers and streams carry nutrients, salts, sediments, and pollutants.

Evaporation refers to the process in which liquid is converted into gaseous state or vapours. Precipitation is the process in which gaseous vapours are turned into liquid state and are shed down on the Earth.

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The odd one in the first group is hydrogen because all other elements are noble gases. The odd one in the second group is lithium since other elements are gases.

Groups are vertical columns containing elements of similar properties and same valency. The first two groups are metals and most of the p-block elements such as nitrogen, oxygen etc. are gases.

In the first series, except hydrogen all other elements are noble gases and belongs to the same group and in the second series except lithium all other element are gases.

Hence the odd one in first series is hydrogen and in the second series is lithium.

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It is dangerous to mix chlorine and vinegar together as cleaner because that would produce a large amount of chlorine gas by shifting the equilibrium to the left.

As per the Le Chatelier's principle, if the equilibrium of a reaction is disturbed by changing any property of the reaction, then the reaction will automatically shift in that direction which would compensate the effect of the change in property, in order to establish the equilibrium again.

In the reaction,

Cl₂(g) + 2NaOH(aq) ⇄ NaOCl(aq) + NaCl(aq) + H₂O(l)

Currently this reaction is in equilibrium, but if the concentration of any of the product is added in the system, the equilibrium will be disturbed, to established the equilibrium again, the the reaction will shift towards left and more and more amount of reactant will be formed, and more and more chlorine gas will be formed which is toxic.

Now to the doubt asked in the question,

If vinegar is added to the system, the amount of NaOH will be consumed which will decrease the concentration of NaOH and the concertation of water will increase because of acid water neutralization reaction.

The increased amount of water and the decreased amount of NaOH will heavily shift the equilibrium to the Left which is again producing chlorine gas which is not good.

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The percent yield of the reaction is 81.95%.

The reaction of lithium sulfate with barium nitrate results to the precipitation of barium sulfate. The reaction is given below.

Li₂SO₄ + Ba(NO₃)₂ ⇒ BaSO₄ + 2 LiNO₃

Convert the mass of lithium sulfate used in the reaction to moles.

moles = mass/MM

moles = 25.0 g / 109.94 g/mol

moles = 0.2273967619

If 0.2273967619 moles lithium sulfate reacts with excess barium nitrate, then, theoretically, it will produce 0.2273967619 moles barium sulfate.

Convert the theoretical moles of barium sulfate to mass.

theoretical mass = MM(moles)

theoretical mass = 233.43 g/mol (0.2273967619 moles)

theoretical mass = 53.08122612 g

If the actual mass of the product is 43.5 g, solve the percent yield using the equation below.

percent yield = (actual/theoretical) x 100

percent yield = 43.5 g/53.08122612 g

percent yield = 81.95%

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The PH of the solution obtained by mixing such concentration would be 3.56 that is by mixing 35 ml of 0.250 M hcl and 35 M of NaOH.

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Answer:

The rock helps smother unwanted plant growth, but some stubborn weeds find a way to thrive. Weed prevention starts before you put the rocks down and continues with regular maintenance to stop a large-scale weed invasion.

Explanation:

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