Select the correct answer.
Which letter represents the wavelength of the wave?
c
ОА а
OB. b
ОС, с
OD d

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Actually Welcome to the Concept of the Kinematics.

Here, we know that, Velocity = Distance / Time,

So here, Distance = 10km = 10×1000 = 10000 metres.

, Time = 14 min 30 sec = 870 seconds,

so now, we get velocity as,

=> V = 10000 ÷ 870 => 11.49 m/s .

Hence, Velocity is 11.49 m/s.

Answer:

longer/less

Explanation:

In moving from left to right on the electromagnetic diagram, the wavelength becomes longer and the energy lessens.

The electromagnetic diagram presents a spectrum of radiation.

Answer:

What is this asking for?

Explanation:

I’ll put the answer in the comments

Answer:

5m/s²

Explanation:

Given parameters:

Initial velocity  = 10m/s due east

Final velocity  = 30m/s due east

Time = 4s

Unknown:

Acceleration of the car = ?

Solution:

Acceleration is the rate of change of velocity with time.

Mathematically;

 Acceleration  = [tex]\frac{v - u}{t}[/tex]  

v is the final velocity

u is the initial velocity

t is the time taken

  Insert the parameters and solve;

  Acceleration  = [tex]\frac{30 - 10}{4}[/tex]   = 5m/s²

Answer:

[tex]V_2=1.80L[/tex]

Explanation:

Hello!

In this case, since in this problem we can see that the volume, pressure and temperature are changing, considering that the vapor pressure of water at 0 °C or also 273 K is 0.006 atm, the pressure of dry hydrogen would be 0.99 atm, thus, we can write:

[tex]\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}[/tex]

Now, as we need the final volume V2, by solving for it, we write:

[tex]V_2=\frac{P_1V_1T_2}{T_1P_2}[/tex]

In such a way, we plug in the given data to obtain:

[tex]V_2=\frac{0.97atm*2.0L*273K}{298K*0.99atm}\\\\V_2=1.80L[/tex]

Which means that the underwent a compression.

Best regards!

Taking into account the combined gas law, the volume of the dry hydrogen gas at 273 K and a pressure of 1 atm is 1.78 L.

Gay-Lussac's law states that when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases.

Mathematically, this law indicates that the quotient between pressure and temperature is constant:

[tex]\frac{P}{T}=k[/tex]

Boyle's law says that the volume occupied by a certain gaseous mass at constant temperature is inversely proportional to pressure.

Boyle's law is expressed mathematically as:

P× V = k

Charles's law states that for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases. That is, temperature and volume are directly proportional.

In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the ratio that exists between the volume and the temperature will always have the same value:

[tex]\frac{V}{T}=k[/tex]

Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:

[tex]\frac{PxV}{T}=k[/tex]

Studying two different states, an initial state 1 and a final state 2, it is satisfied:

[tex]\frac{P1xV1}{T1}=\frac{P2xV2}{T2}[/tex]

In this case you know:

Replacing in the combined gas law:

[tex]\frac{0.97 atmx2 L}{298 K}=\frac{1 atmxV2}{273 K}[/tex]

Solving:

[tex]\frac{0.97 atmx2 L}{298 K}\frac{273 K}{1 atm} =V2[/tex]

1.78 L= V2

In summary, the volume of the dry hydrogen gas at 273 K and a pressure of 1 atm is 1.78 L.

Learn more about the combined gas law:

Answer:

52.9 KJmol-1

Explanation:

From;

log(k2/k1) = Ea/2.303 * R (1/T1 - 1/T2)

The temperatures must be converted to Kelvin;

T1 = 25° C + 273 = 298 K

T2= 35°C + 273 = 308 K

R= gas constant = 8.314 JK-1mol-1

Substituting values;

log 2 = Ea/2.303 * 8.314 (1/298 - 1/308)

Ea = 52.9 KJmol-1

Answer:

The energy of a vibrating molecule is quantized much like the energy of an electron in the hydrogen atom. The energy levels of a vibrating molecule are given by the equation: En=(n+21)hv where n is a quantum number with possible values of 1, 2, ... and v is the frequency of vibration.

Explanation:

hope it helps.

have a wonderful day!

Answer:

alkali metal

Explanation:

The alkali metals in period 4 will have the lowest ionization energy of the elements in the period.

Across a period ionization energy increases progressively from left to right due to decreasing atomic radii caused by the increasing nuclear charge which is not compensated for by successive electronic shells.

Down a group, it decreases.

The periodic table is the arrangement of the elements based on the atomic numbers. The elements of the alkali period have the lowest ionization energy.

Ionization energy or the potential is the amount of the potential needed by the molecule or the atom to remove the electron from their shells. The alkali metal elements have the lowest ionization energy.

The ionization potential of the elements increases from the left towards the right of the period due to the decrease in the atomic radii and decreases from top to bottom in a group.

In the period from left to right the atomic radius of the atoms decreases due to the increase in the nuclear charge of the atoms.

Therefore, option B. alkali metal has the lowest ionization energy.

Learn more about ionization energy here:

https://brainly.com/question/837763

Answer:

241.08039999999588

Explanation:

Answer: Warm Water and powdered lemonade.

Explanation: Water is faster at dissolving something and powder takes a smaller effort to dissolve.

Answer:

C

Explanation:

We know, when temperature and pressure is constant :

[tex]\dfrac{V_1}{n_1}=\dfrac{V_2}{n_2}[/tex]      ....1)

[tex]n_1 = 3\ moles,\ V_1 = 1.50\ L[/tex]

[tex]n_2 = 3 + 0.80 = 3.80 \ moles[/tex]

Let, final volume is [tex]V_2[/tex].

Putting all values in equation 1), we get :

[tex]\dfrac{V_1}{n_1}=\dfrac{V_2}{n_2}\\\\\dfrac{1.50}{3}=\dfrac{V_2}{3.80}\\\\V_2 = \dfrac{1.50\times 3.80}{3}\\\\V_2 = 1.9\ L[/tex]

Therefore, volume (in L) of the balloon if 0.80 moles of gas are added is 1.9 L.

Hence, this is the required solution.

Explanation:

1. total electrons = 22

2. total electrons = 31

3. total electrons = 37

hope it helps:)

Answer:

1.Argon

2. Scandium

3. Cobalt

Answer:

Lithium and Sodium

Explanation:

Answer: Where is the folowing?

Explanation:

Answer:

6 mol H₂O

General Formulas and Concepts:

Chemistry

Explanation:

Step 1: Define

RxN:     2H₂ + O₂ → 2H₂O

Given:   3 moles O₂

Step 2: Stoichiometry

[tex]3 \ mol \ O_2(\frac{2 \ mol \ H_2O}{1 \ mol \ O_2} )[/tex] = 6 mol H₂O

Step 3: Check

We are given 1 sig fig.

Our final answer has 1 sig fig, so no need to round.

Answer:

Electrones de valencia.

Explanation:

¡Hola!

En este caso, dado en química se conocen las estructuras de Lewis como representaciones gráficas de como los elementos están enlazados entre sí, debemos tener en cuenta que estos enlaces se forman entre los electrones de valenciam, los cuales son utilizados para su representación. Se sabe que los electrones de valencia son representados con puntos alrededor del elemento a través de puntos que se unen entre sí y son el número de electrons en la capa más externa de los elementos en cuestión; por ejemplo, cloro tiene 7 electrones de valencia, azufre tiene 6, hidrogeno 1, carbono 4 y así sucesivamente.

¡Saludos!

Gold have a greater mass

Density is a quantity derived from the mass and volume  

Density is the ratio of mass per unit volume  

The unit of density can be expressed in g/cm³ or kg/m³  

Density formula:  

[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]

ρ = density  

m = mass  

v = volume  

[tex]\tt mass=\rho\times V\\\\mass=10.5\times 5=52.5~g[/tex]

[tex]\tt mass=\rho\times V\\\\mass=19.3\times 5=96.5~g[/tex]

Answer:

Frequency x Wavelength = Speed of wave

Explanation:

So, if you take the Speed and divide it by wavelength then you get the frequency.

Answer:

The gecko's feet have tiny suction cups on them that stick to the surface.

Answer:

c) pillars

Explanation:

Answer:

D

Explanation:

because the higher the wavelength the shorter the pitch and the shorter the wavelength the higher the pitch

Answer:

Fluorine

Explanation:

Electronegativity increases as you go from left to right across the periodic table and decreases as you go from top to bottom of the periodic table.

Fluorine is in period 3, group 17

Radium is in period 7, group 2

Radium is in period 7 and we know that electronegativity decreases as you move from top to bottom.

Explanation: As you move from top to bottom, you are in higher energy level, which means that your distance from the nucleus is further away.

Answer:

Fluorine

General Formulas and Concepts:

Chemistry

Explanation:

The Periodic Trend for Electronegativity is up and to the right of the Periodic Table.

Fluorine is Element 9 and has 9 protons. Radium is Element 88 and has 88 protons. Therefore, Radium has a bigger Zeff than Flourine.

However, since Radium is in Period 7 while Fluorine is in Period 2, Radium has more core e⁻ than Fluorine does. This will create a much larger shielding effect, causing Radium's outermost e⁻ to have less FOA between them. Fluorine, since it has less core e⁻, the FOA between the nucleus and outershell e⁻ will be much stronger.

Therefore, Fluorine would attract an electron more than Radium, thus bringing us to the conclusion that Fluorine has a higher electronegativity.

Answer:

2.43 moles of water are required.

Explanation:

Given data:

Moles of H₂O required = ?

Moles of NO₂ present = 7.30 mol

Chemical equation:

3NO₂+ H₂O  →     NO + 2HNO₃

Now we will compare the moles of NO₂ and H₂O.

                    NO₂       :           H₂O

                      3          :              1

                   7.30        :          1/3×7.30 = 2.43 mol

Na₂SO₄ (aq) → 2Na⁺ (aq) + SO4²⁻ (aq) correctly describes the dissociation of sodium sulfate into ions in an aqueous media

Dissociation reactions are those reactions in which a molecule dissociates into their constitute ions.

In the question, dissociation of sodium sulfate takes place as follow:

Na₂SO₄ (aq) → 2Na⁺ (aq) + SO4²⁻ (aq)

Above reaction shows the dissociation of Na₂SO₄ where in the right side sodium ion is present in the +1 oxidation state and sulfate ion is present in the -2 oxidation state.

Hence, option (a) is correctly describes the dissociation.

To learn more about dissociation reaction, visit the below link:
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Answer:

The specific rotation of D is 11.60° mL/g dm

Explanation:

Given that:

The path length (l) =  1 dm

Observed rotation (∝) = + 0.27°

Molarity = 0.175 M

Molar mass = 133.0 g/mol

Concentration in (g/mL) = 0.175 mol/L × 133.0 g/mol

Concentration in (g/mL) = 23.275 g/L

Since 1 L = 1000 mL

Concentration in (g/mL) = 0.023275 g/mL

The specific rotation [∝] = ∝/(1×c)

= 0.27°/( 1  dm ×  0.023275 g/mL )

= 11.60° mL/g dm

Thus, the specific rotation of D is 11.60° mL/g dm

Answer:

the process of growth or increase, typically by the gradual accumulation of additional layers or matter.

Explanation:

Answer:

The process of growth or increase, typically by the gradual accumulation of additional layers or matter.

Explanation:

Answer:

Molecular formula of the compound = H₂CO₃

Explanation:

First, the empirical formula of the compound is determined

Percentage by mass of each element is given as shown below:

H = 3.3% ; C = 19.9%; O = 77.4%

Mole ratio of the elements= percentage mass/ molar mass

H = 3.3/ 1 = 3.3

C = 19.3/12 = 1.6

O = 77.4/16 = 4.8

whole number ratio is obtained by dividing through with the smallest ratio

H = 3.3/1.6; C = 1.6/1.6; O = 4.8/1.6

H : C : O = 2 : 1 : 3

Empirical formula = H₂CO₃

Molecular formula/mass = n(empirical formula/mass)

60 = n(2*1 + 12*1 + 16*3)

60 = n(62)

n = 60/62 = 0.96

n is approximately = 1

Therefore, molecular formula of the compound = (H₂CO₃) * 1

Molecular formula of the compound = H₂CO₃

The molecular formula of a compound composed of 3.3% H, 19.3% C, and 77.4% O and a molar mass of approximately 60 g/mol is CH2O3.

HOW TO CALCULATE MOLECULAR FORMULA:

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Answer:

Prophase

Explanation:

Prophase is the first stage in mitosis, occurring after the conclusion of the G2 portion of interphase. During prophase, the parent cell chromosomes — which were duplicated during S phase — condense and become thousands of times more compact than they were during interphase.

Answer:

2-pentene or pent-2-ene