Can someone help me with these two questions

Answer:

3750 m

Explanation:

We must first know the speed of sound in water in order to solve this problem.

So, speed of sound in water = 1500 meters per second

Now time taken = 5 seconds

Given that;

v = 2x/t

where x is the distance below;

vt = 2x

x = vt/2

x = 1500 * 5/2

x = 3750 m

Answer:

B. Thompson - Cathode Ray Tube/Plum Pudding

Explanation:

The scientist and the model/experiment that unintentionally discovered the electron was the Thompson's - Cathode Ray Tube/Plum Pudding.

Experiments on the discharge tubes was performed by J.J Thomson in 1897 and this led to the discovery of the electron as a subatomic particle.

The properties of the cathode rays were studied and presented by Thomson in his work at that time.

Answer:

Mass = 19.53 g

Explanation:

Given data:

Number of atoms of iron = 2.10 ×10²³ atoms

Mass of iron = ?

Solution:

The number 6.022 ×10²³ is called Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

1 mole contain 6.022 ×10²³ atoms

2.10 × 10²³ atoms ×  1 mol / 6.022 ×10²³ atoms

0.35 mol

Mass of iron atoms:

Mass = Number of moles × molar mass

Mass = 0.35 mol × 55.8 g/mol

Mass = 19.53 g

Answer:

During cytokinesis, which is a physical process of cell division, the cells divide the cytoplasm of a parent cell into two daughter cells. The ring on the outside of the cell which is also known as a contractile ring, shrinks at the equator of the cell which causes pinching, and the plasma membrane goes inward. After all that happens there’s something called a cleavage furrow which is the formation of a dip between the two cells while they are splitting.

(You can sum it up, but I hope this helps!)

Answer:

Number of moles = 1.5 mol

Explanation:

Given data:

Number of moles = ?

Mass in gram = 3 g

Solution:

Formula:

Number of moles = mass/molar mass

Molar mass of hydrogen gas = 2.02 g/mol

By putting values,

Number of moles = 3 g / 2.02 g/mol

Number of moles = 1.5 mol

Answer:

I guess one mole. of mercury

Explanation:

because mercury is denser

The one that has the  greatest mass

To determine which of the given options has the greatest mass, we need to compare the molar masses of the substances.

The molar mass is the mass of one mole of a substance and is expressed in grams per mole (g/mol).

The molar masses of the given substances are:

Gold (Au): 197.0 g/mol

Mercury (Hg): 200.6 g/mol

Barium (Ba): 137.3 g/mol

Comparing the molar masses, we can see that one mole of mercury (Hg) has the greatest mass among the options provided.

Therefore, the correct answer is:

c. One mole of mercury.

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Answer:

When bethany walks across a carpet, her socks pick up many electric charges. Later in the day, these charges are no longer present on her socks. What most likely happened to the charges.

A. the charges disappeared.

B. The charges switched signs

C. the charges transferred to another object ✓

D. The charges broke apart into smaller particles

Answer:

M=22.5 grams

Volume= 13.7 cm^3

p=m/v

Divided and p= 1.64 g/cm^3

Answer:

its unbalanced  

have a great day/night

Explanation:

please mark brainlest

Answer:

true

Explanation:

Answer:

True the wind causes waves in the ocean

Explanation:

Answer:

164moles

Explanation:

Given parameters:

Number of molecules of CO₂   = 9.86 x 10²⁵molecules

Unknown:

Number of moles  = ?

Solution:

To solve this problem, a mole of any substance contains the Avogadro's number of particles.

In that;

        6.02 x 10²³ molecules makes up 1 mole of a substance

        9.86 x 10²⁵molecules   contains [tex]\frac{9.86 x 10^{25} }{6.02 x 10^{23} }[/tex]   = 1.64 x 10²moles

The number of moles is 164moles

Answer

Fe2O3+3CO→2Fe+3CO2.

Explanation:

Answer:

4.1m/s

Explanation:

6.5min=6×60+30=390s

v=1600÷390=4.1m/s

John is running the 1600-meter race at his school's track meet. He runs the full 1600 meters in 6.5 minutes, then his average speed of John would be 4.1 meters per second.

The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object.

As given in the problem, John is running the 1600-meter race at his school's track meet. He runs the full 1600 meters in 6.5 minutes,

The distance covered by the John = 1600 meters

The time taken by the John = 6.5 minutes

                                                 =6.5×60

                                                  =390 seconds

The speed of the John = 1600/390

                                      = 4.1 meters per second

Thus,the speed of the John n meters/second rounded to the nearest tenth would be  4.1 meters per second.

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Answer:       H

               H- C- H

                    H

Explanation:

Lewis structures are the structures which represent the valence electrons of the element around the chemical symbol of the element.

Carbon is an element which belong to group 14. Atomic number of carbon is 6 that means it contains 6 electrons, Thus the electronic configuration is represented as: [tex]1s^22s^22p^2[/tex] . Thus the valence electrons are 4.

Hydrogen is an element which belong to group 1. Atomic number of hydrogen is 1 that means it contains 1 electron, Thus the electronic configuration is represented as: [tex]1s^1[/tex] . Thus the valence electron are 1.

The four valence electrons of carbon are shared with one valence electron of hydrogen each.

Answer:

V = 42.6 L

Explanation:

Given data:

Number of moles of Cl₂ = 1.9 mol

Temperature and pressure = standard

Volume occupy = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

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

T = temperature in kelvin

By putting values,

1 atm ×  V = 1.9 mol ×0.0821 atm.L /mol.K × 273.15 k

V = 42.6  atm.L / 1 atm

V = 42.6 L

Answer: c)4, 7, 2, 4

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products formed must be equal to the mass of reactants taken.

In order to get the same mass on both sides, the atoms of each element must be balanced on both sides of the chemical equation.

The balanced chemical equation will be :

[tex]4FeS+7O_2\rightarrow 2Fe_2O_3+4SO_2[/tex]

The coefficients when the chemical equation below is balanced are 4, 7, 2, 4

Explanation:

Juno's primary goal is to reveal the story of Jupiter's formation and evolution. Using long-proven technologies on a spinning spacecraft placed in an elliptical polar orbit, Juno will observe Jupiter's gravity and magnetic fields, atmospheric dynamics and composition, and evolution.

Answer:

Jupiter.

Explanation:

Answer:

c is correct answer my girl f

Answer:

The volume of the container would be 1507 L

Explanation:

These question can be solved in two different ways:

Let's do the short road.

We know that 1 mol of anything at STP conditions occupies 22.4 L

By a rule of three:

1 mol contains 22.4L at STP

Then, 67.3 mol of gas would be contained in (67.3 . 22.4) /1 = 1507.5 L

We assume CO₂ as an Ideal Gas, so we can apply P . V = n . R . T

At STP, T is 273.15K and P = 1 atm. We replace:

1 atm . V = 67.3 mol . 0.082 . 273.15K

V = (67.3 mol . 0.082 . 273.15K) / 1 atm → 1507 L

Answer:

brittle

Explanation:

Answer:

brittle

Explanation:

Answer:

C. I (iodine)

Explanation:

it would be Iodine because it has 5 energy levels of electrons and has a total of 74 neutrons inside its nucleus!

Hope this helps, have a good day!

Moles of Al₂O₃ formed : 1.42

Given

6.33 mol O₂

9.15 mol Al

Required

moles of Al₂O₃

Solution

Reaction

4Al + 3O₂ ⇒ 2Al₂O₃

Find limiting reactant (mol : coefficient) :

Al = 9.15 : 4 = 2.29

O = 6.38 : 3 = 2.13

O₂ as a limiting reactant(smaller ratio)

Mol Al₂O₃ based on mol O₂ as a limiting reactant

From equation, mol ratio Al : Al₂O₃ = 4 : 2, so mol Al₂O₃ :

= 2/3 x mol O₂

= 2/3 x 2.13

= 1.42

Answer:

New temperature T2 = 16.59°C Approx

Explanation:

Given:

Old volume V1 = 2.36 L

Old temperature T1 = 27°C

New volume V2 = 1.45 L

Find:

New temperature T2

Computation:

Using Charles's Law;

V1T2 = V2T1

(2.36)(T2) = (1.45)(27)

New temperature T2 = 16.59°C Approx

Answer:

Gadolinium (Gd).......

Answer: False

Explanation: In the written form of an ionic compound, the positively charged cation always comes before the negatively charged anion. For instance, the written name for is calcium chloride because the compound has calcium () cations and chloride () anions.

In the formula for an ionic compound, the negative ion is always written first. This statement is false.

The term an ionic compound is defined as a chemical compound composed of ions carried together by electrostatic forces termed ionic bonding.

The compound is neutral charge, but made up of positively charged ions called cations and negatively charged ions called anions.

The compounds that affect a metal binding with either a non-metal or a semi-metal will display ionic bonding.

In the formula an ionic compound, the positively charged cation always comes before the negatively charged anion.

For example, the written name for is calcium chloride because the compound has calcium (+) cations and chloride (-) anions.

Thus, In the formula for an ionic compound, the positive ion is always written first.

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Answer:

option B

hope this helps :D

Answer:

B

Explanation:

I'm 99.9% sure that was the answer when I had this question last year

Answer:

C, the nucleus of an atom changes.

Explanation:

Ape.x

Answer:

it is not a chemical change

Explanation:

it is a physical change as a paper towel can be  dried in the sun to turn into a regular paper towel thus proving that a paper towel absorbing water is a physical change not a chemical change

Answer: tell that person how u feel

Explanation: If it doesn’t go well ask if u can just stay friends

Answer:

personaly i wouldn't get involved but you wanna tell him/her how you fell go for it.