pls help will give brainiest

Answer:

Gadolinium (Gd).......

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:

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:

its unbalanced  

have a great day/night

Explanation:

please mark brainlest

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: 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.

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:

brittle

Explanation:

Answer:

brittle

Explanation:

Answer:

true

Explanation:

Answer:

True the wind causes waves in the ocean

Explanation:

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

Answer:

bbbbnnnnnnnnnnnnnnn

Explanation:

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:

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:

H₂O₂

Explanation:

The molecular formula gives the exact number of atoms within a chemical compound.

In this problem:

Mass of O  = 32g

Mass of H = 2g

  Let us follow this methodical approach to solve the problem:

Elements                                  O                                       H

Mass                                         32                                      2

Molar mass                               16                                       1

Number of moles                  32/16                                     2/1        

                                                  2                                         2

The molecular formula of the compound is H₂O₂                

Answer:

1. Exothermic reaction

2. Is being released

3. The energy comes from the change in energy between reactants and products

Explanation:

The reaction is producing energy. A reaction that produce energy is called a Exothermic reaction.

As the energy is produced, the energy is being released.

As you can see in the image, the energy of the reactants is higher than the energy of the products. This change of energy in the chemicals produce the production of energy as heat.

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: 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:

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:

c is correct answer my girl f

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: bases

Explanation:

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:

Explanation:

this is what the Lewis electron-dot diagram of a Cl2 molecule looks like

Lewis electron  diagram of a chlorine molecule is attached in the picture below.

Lewis dot structures are also called as electron dot structures and can be drawn if the molecular formula of a compound is known. It provides information regarding the nature of bond and the position of atoms .

They are also capable of exhibiting the lone pair if any present in a molecule or compound.Lewis defined a base to be an electron pair donor and an acid to be an electron pair acceptor.

They are capable of reflecting electronic structure of elements and even the pairing of electrons . In the diagram, each dot represents an electron while a pair of dots represent a bond between the atoms.They are useful in predicting the structure.

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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

Fe2O3+3CO→2Fe+3CO2.

Explanation:

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:

M=22.5 grams

Volume= 13.7 cm^3

p=m/v

Divided and p= 1.64 g/cm^3

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