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Answer: Are there options? I think the answer is continents, but I don't really understand the question. Is continents an option?

Explanation:

Answer:

1.  

First of all, let's convert the energy of the absorbed photon into Joules:

The energy of the photon can be rewritten as:

where

h is the Planck constant

c is the speed of light

is the wavelength of the photon

Re-arranging the formula, we can solve to find the wavelength of the absorbed photon:

2. 1.24 eV

In this case, when the electron jumps from the n=4 level to the n=3 level, emits a photon with wavelength

So the energy of the emitted photon is given by the formula used previously:

and using

we find

converting into electronvolts,

Explanation:

Answer:

because the particles in solids are more close together and strong so they would support it better than fluid because fluid particles are spread out

Explanation:

Have A Wonderful Day !!

Due to properties of solid substances, they support objects easier than liquid.

Solids can support objects easier than fluids because in solid, particles are present on fix place as compared to liquid which is not fix and can move from one place to another. In Solid substances, particles are fix so they provides better support to the objects which are placed on them.

While on the other hand, in liquid substances particles are mobile so they are not considered better supporter for objects so we can conclude that due to properties of solid substances, they support objects easier than liquid.

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Answer:

hey :)

your answer is D.

Explanation:

To find density, you must divide mass and volume.

8 divided by 4 is 2

6 divided by 6 is 0

4 divided by 2 is 2

hope i helped any :))

1

Explanation:

because they period two

Answer:

1

Explanation:

Answer:

D. An ion with a +1 charge

Explanation:

The location of the lithium on the periodic table is in the first row, it is the third element. The type of ion that lithium form is  An ion with a +1 charge. The correct option is D.

Lithium is the third element of the periodic table. Its atomic number is three. It is white with a silvery touch. It is a metal that is highly reactive and flammable. The element, lithium, has the highest binding tendency with other elements.

Lithium contains 3 protons and 3 electrons. When it loses a proton, it contains two ions. It is a metal, so it will donate electrons, therefore it will contain 1 + charge.

Thus, the correct option is D. An ion with a +1 charge. Lithium is the third element and is located in the first row of the periodic table.

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Answer:

 156.8kPa

Explanation:

The problem here is to convert mmHg to kPa;

We have been given:

            1176mmHg and the problem is to convert to kPa;

  1000Pa = 1kPa

               1 mmHg  =  133.322Pa

               1176mmHg will give  1176 x 133.322  = 156787.1Pa

To kPa;

             156.8kPa

Answer:

470.4N

Explanation:

Given parameters:

Mass of Stephanie  = 48kg

Unknown:

Force she exerts while falling to the ground  = ?

Solution:

The force she exerts is her weight;

  Weight  = mass x acceleration due to gravity

  Now insert the parameters ands solve ;

  Weight  = 48 x 9.8 = 470.4N

Answer:

V = 5.74 L

Explanation:

Given data:

Volume of carbon dioxide produced = ?

Temperature and pressure = standard

Mass of calcium carbonate = 25.6 g

Solution:

Chemical equation:

CaCO₃      →        CaO + CO₂

Number of moles of calcium carbonate:

Number of moles = mass / molar mass

Molar mass of calcium carbonate = 100 g/mol

Number of moles = 25.6 g/ 100 g/mol

Number of moles = 0.256 mol

Now we will compare the mole of calcium carbonate with carbon dioxide.

                       CaCO₃           :            CO₂

                            1                :             1

                         0.256          :         0.256

Volume of  CO₂:

PV = nRT

R = general gas constant = 0.0821 atm/L / mol.K

By putting values,

1 atm× V = 0.256 mol × 0.0821 atm/L / mol.K× 273.15 K

V = 5.74 atm/L / 1 atm

V = 5.74 L

Answer:

4.43 g

Explanation:

The reaction between sodium chloride and flourine gas is given as;

NaCl + F2 --> NaF + Cl2

From the stochiometry of the equation;

1 mol of NaCl reacts eith 1 mol of F2 to form 1 mol of NaF and Cl2

Mass of 1 mol of F2 = 38g

Mass of 1 mol of sodium flouride, NaF = 42g

This means 38g of flourine reacted with NaCl to form 42g of NaF

xg of F2 would form 4.9g of NaF

38 = 42

x = 4.9

x = 4.9 * 38 / 42

x = 4.43 g

Answer: It means that the energy is being stored or preserved to be used at a later time.

Your question was a little vague, so if this isn't the answer you were looking for, just let me know and I'll fix it.

Hope this helps! Good luck! :D

Answer:

  B)  2.87 L

Explanation:

A mole of any gas at STP has a volume of about 22.412 liters. So, 0.128 moles of gas will have a volume of ...

  0.128 · 22.412 L ≈ 2.87 L

Answer:

Explanation:

Low pressure is one of the defining features of a hurricane. Therefore, the correct option is option C.

Hurricanes are intense tropical storms with spiralling winds, copious amounts of rain, and storm surges. These storms can pose a variety of issues when they hit land because they often occur over warm ocean waters close to the equator. Hurricanes leave a path of destruction in their wake, wrecking everything in their path from homes and infrastructure to creating severe flooding and landslides. The unpredictable nature of hurricanes is among their most worrisome features. Although modern technology and meteorological techniques have given us improved storm tracking and prediction systems, it is still challenging to correctly anticipate a hurricane's exact route and intensity.

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Answer:

B D

Explanation:

hope this is right but not entirely sure

One mole of zinc contains 6.02 × 10²³ Zn atoms or formula units. Hence,6.53 moles of Zn contains 3.9  × 10²⁴ Zn atoms.

One mole of a substance is its amount containing 6.02 × 10²³  atoms or molecules. This number is called Avogadro number. One mole of every elements contains Avogadro number of atoms.

Similarly one mole of every compound contains 6.02 × 10²³  molecules. The mass of one mole of compound is called its molar mass.

Zn is 30th element in periodic table. Zn is a transition metal.  One mole of Zn  contains 6.02 × 10²³ Zn atoms . Hence number of atoms of 6.53 moles is:

6.53  × 6.02 × 10²³  = 3.9 × 10²³ .

Hence, there will be 3.9 × 10²⁴  Zn atoms in 6.53  moles.

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Answer:

Answer: The correct answer is Option B.

Explanation:

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}Number of moles=Molar massGiven mass   ....(1)

For N_2N2 :

Given mass of nitrogen gas = 10 g

Molar mass of nitrogen gas = 28 g/mol

Putting values in above equation, we get:

\text{Moles of iron oxide}=\frac{10g}{28g/mol}=0.357molMoles of iron oxide=28g/mol10g=0.357mol

The given chemical reaction follows:

N_2+O_2\rightarrow 2NON2+O2→2NO

As, oxygen gas is present in excess. Thus, it is considered as an excess reagent and nitrogen is considered as a limiting reagent because it limits the formation of products.

By Stoichiometry of the reaction:

The molar mass of carbon (C) is 12.0107 u.

Answer:

Explanation:

The answer is 12.0107 u

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Answer:

Krypton gain

strontium lose

xenon neither gain or lose

Answer:

0.1139952 is the answer

Explanation:

Answer:

The unit for mass is the kilogram (Kg).

Explanation:

Hope this helped!! <3 good luckk!!

Answer:B & C

tell me if im wrong

Answer:

Q 3 c it will reduce rate of photosynthesis in plants that live in the bottom of the lake

Q4 d the atom are in same group

This is right answer because these two elements are Lithium and neon Lithium is present in first group and Neon in last or group 18

Explanation:

Answer:

sodium chloride + silver nitrate = silver chloride

Explanation:

i believe this is correct, hope it helps :)

Answer:

b.) burning paper

Explanation:

The concentration of a solution : 13.3 g/dm³

Given

mass of solution = 2 g

volume = 150 cm³

Required

The concentration

Solution

The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight/volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.

Volume conversion : 150 cm³ = 0.15 dm³

the concentration : mass : volume = 2 g : 0.15 dm³ = 13.3 g/dm³

Answer:

1 mole of O₂ has more mass compared to 1 mole of Na

Explanation:

1 mole oxygen atom and 1 mole of Na atom has the same number of particles.

A mole of any substance has the Avogadro number of particles which is

6.02 x 10²³

Mass of a substance  = number of moles x molar mass

   Molar mass of O₂  = 2(16)  = 32g/mol

   Molar mass of Na = 23g/mol

Mass of O₂ = 1 x 32  = 32g

Mass of Na = 1 x 23 = 23g

So, 1 mole of O₂ has more mass compared to 1 mole of Na

THe correct answer is heat

Answer:

hi

Explanation:

heat