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2 years ago

10

John dalton proposed a theory that all matter is made up of individuals particles which cannot be divided. what were those parti

cles?

1 answer:

juin [17]2 years ago

3 0

The particles are atoms, his theory is the atomic theory

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Consider an electron placed in a region of space in which the electric potential spatially. The electron is placed at a point wh

loris [4]

Answer:

$1.33\cdot 10^7 m/s$

Explanation:

For a charged particle accelerated by an electric field, the kinetic energy gained by the particle is equal to the decrease in electric potential energy of the particle; therefore:

$K_f-K_i = -q\Delta V$

where

$K_f$ is the final kinetic energy

$K_i$ is the initial kinetic energy

q is the charge of the particle

$\Delta V$ is the potential difference

In this problem,

$q=-1.6\cdot 10^{-19}C$ is the charge of the electron

$\Delta V=-500 V-(-1000 V)=500 V$

The electron starts from rest, so its initial kinetic energy is

$K_i=0$

Therefore,

$K_f=-(-1.6\cdot 10^{-19})(500)=8\cdot 10^{-17}J$

We can write the final kinetic energy of the electron as

$K_f=\frac{1}{2}mv^2$

where

$m=9.11\cdot 10^{-31} kg$ is the electron mass

v is the final speed

And solving for v,

$v=\sqrt{\frac{2K_f}{m}}=\sqrt{\frac{2(8\cdot 10^{-17})}{9.11\cdot 10^{-31}}}=1.33\cdot 10^7 m/s$

5 0

2 years ago

Explain how you know it must be oxygen. Where

kaheart [24]

Answer:

oxygen is a present in our atmosphere and mixed with other gases on the surrounding screen plants are also measure source of getting oxygen they take carbon dioxide from making their food by for the cities and give away oxygen in return

Explanation:

most of the earth oxygen comes from tiny Ocean plants are called phytoplaston

4 0

2 years ago

C. What is Cytoplasm? What does it contain?

photoshop1234 [79]

Answer:

Cytoplasm is the space between cell membrane and nuclear membrane filled with a translucent liquid . It contains carbohydrates , proteins , lipids , nucleic acids , sodium and pottassium salts , water and enzymes .

6 0

3 years ago

A concentrated aqueous solution of Pb(NO3)2 is slowly added to 1.0 L of a mixed aqueous solution containing 0.010 M Na2CrO4 and

Oduvanchick [21]

Answer:

This means the amount of PbCrO4 will precipitate first, with a [Pb^2+] concentration of 1.8*10^-12 M

Explanation:

Step 1: Data given

Molarity of Na2CrO4 = 0.010 M

Molarity of NaBr = 2.5 M

Ksp(PbCrO4) = 1.8 * 10^–14

Ksp(PbBr2) = 6.3 * 10^–6

Step 2: The balanced equation

PbCrO4 →Pb^2+ + CrO4^2-

PbBr2 → Pb^2+ + 2Br-

Step 3: Define Ksp

Ksp PbCrO4 = [Pb^2+]*[CrO4^2-]

1.8*10^-14 = [Pb^2+] * 0.010 M

[Pb^2+] = 1.8*10^-14 /0.010

[Pb^2+] = 1.8*10^-12 M

The minimum [Pb^2+] needed to precipitate PbCrO4 is 1.8*10^-12 M

Ksp PbBr2 = [Pb^2+][Br-]²

6.3 * 10^–6 = [Pb^2+] (2.5)²

[Pb^2+] = 1*10^-6 M

The minimum [Pb^2+] needed to precipitate PbBr2 is 1*10^-6 M

This means the amount of PbCrO4 will precipitate first, with a [Pb^2+] concentration of 1.8*10^-12 M

5 0

2 years ago

To three significant digit,what is the mass percentage of iron in the compound Fe2O3

svlad2 [7]

69.9%

Explanation:

To find the mass percentage of iron in the compound in Fe₂O₃, we would go ahead to express the given molar mass of the iron to that of the compound.

Mass percentage = $\frac{molar mass of Fe}{Molar mass of Fe_{2}O_{3} }$ x 100

Molar mass of Fe = 55.85g/mol

Molar mass of O = 16g/mol

Molar mass of Fe₂O₃ = 2(55.85) + 3(16) = 159.7‬g/mol

Mass percentage = $\frac{2(55.85)}{159.7} x 100$ = 69.94% = 69.9%

learn more:

Mass percentage brainly.com/question/8170905

#learnwithBrainly

4 0

2 years ago