Carbon and hydrogen forms three different compounds A, B and C in which the percentage of carbon are 75%, 85.7% and 92.3% respectively. Which law of chemical composition can be illustrated with these data?

Answer: the oxidation of the copper (it turning green)

Explanation:

Answer:

Explanation:

energy for photon is calculated in same wasy as for electromagnetic radiation

energy for electromagnetic radiation = hf

where f is the frequency of photon

h is Planck's constant = h = 4.14 × 10−15 eV · s.

thus

energy of photon = 4.14 × 10−15 eV · s *  2.36 x 10-19 Hz

energy of photon = 9.77 * 10−(-15+ -19) eV

energy of photon = 9.77 * 10−34eV        answer

Answer:

The charge on a neutron=1+-/neutral

It has a mass 1

The charge on electron is 1-/negative

It's mass is 1/1840

The charge on a proton is 1+

It has a mass 1 too.

Explanation:

Answer:

Properties of elements repeat in predictable patterns.

Answer:

matter im pretty sure sorry if its wrong

Explanation:

based on the property of conserving matter, matter can not be created or destroyed

Answer:

Gives us oxygen to live, and if produces products such as, rubber, timber, herbs, and medicines.

Answer:

some zoom in farther

Explanation:

some microscopes zoom in farther than others so we can see even smaller things

Answer:

because our planet is spinning

which means the objects near the equator are moving at much faster velocities than objects at higher latitudes

I hope this helps✌

Answer:

1.46 moles

Explanation:

You need to multiply 35.4g by Magnesium's molar mass.

Molar mass =1 mole/24.305g

(35.4g)(1 mole Mg/24.305g)= 1.46 moles <- rounded to 3 significant figures

As you can see, grams cancel out and you're left with moles.

Answer:

hello your question is incomplete attached below is the complete question and answer

answer: attached below

Explanation:

A) attached below

B) attached below

Answer:

V = 34.55 L

Explanation:

Given that,

No of moles, n = 1.4

Temperature, T = 20°C = 20 + 273 = 293 K

Pressure, P = 0.974 atm

We need to find the volume of the gas. It can be calculated using Ideal gas equation which is :

PV=nRT

R is gas constant, [tex]R=0.08206\ L-atm/mol-K[/tex]

Finding for V,

[tex]V=\dfrac{nRT}{P}\\\\V=\dfrac{1.4\times 0.08206\times 293}{0.974 }\\\\V=34.55\ L[/tex]

So, the volume of the gas is 34.55 L.

Answer:

no

hope this helps

:)

Explanation:

Answer:

energy disturbance easy

a) lithium

Execution:

First, a magnesia stick is dipped in hydrochloric acid and then in lithium chloride. The stick is then held in the burner flame.

Observation:

The flame turns carmine.

b) ammonium ion

Execution:

Some ammonium sulfate is placed in a small vessel. A strip of indicator paper is moistened and stuck to the inside of a watch glass case. Then a few drops of hydrochloric acid are added to the ammonium sulfate and the watch glass bowl is held over the vapors that develop.

Observation:

The indicator paper turns blue because gaseous ammonia is produced, which reacts with the water in the indicator paper to form a base.

c) sulfate ions

Execution:

The ammonium sulfate is dissolved in water and treated with barium chloride solution.

Observation:

A white, poorly soluble precipitate of barium sulfate is formed.

d) presence of water

Execution:

Anhydrous copper sulfate, which is white, is added to the substance to be tested.

Observation:

In the presence of water, the salt turns light blue.

e) carbonate ions

Execution:

A few drops of hydrochloric acid are placed on the solid calcium carbonate.

Observation:

A gas evolution can be observed, during which carbon dioxide is produced.

f) iodide ions

Execution:

A potassium iodide solution is mixed with silver nitrate solution.

Observation:

A yellow precipitate of silver iodide is formed.

Answer:

There are 198 grams of iron in a 450-gram sample of the ore.

Explanation:

From the given information:

Given that:

100-gram sample of iron ore is found in 44g of iron.

Thus. the grams of iron that can be found in a 450-gram sample of the iron ore can be computed as follows:

100g of iron ore = 44g of iron

450 gram of iron ore = x g of iron

x(g) of iron = ( 44g of iron × 450 gram of iron ore) / 100g of iron ore

x(g) of iron =  198 grams of iron

Thus, there are 198 grams of iron in a 450-gram sample of the ore.

Answer:

I think it is synthesis

Answer:

The answer is Synthesis

Explanation:

The two objects combine to make a bigger object

Answer:

I think solids

Explanation:

sorry if its not right

Answer:

A compound of nickel and chloride in which the ratio of nickel (in the +2 oxidation state) to chloride is 1:2. Stars

Explanation:

Answer:

Farming/agriculture

Hope this helps and have a great day :)

And please mark me brainliest if you can :)

Answer:

Physical Change

Explanation:

Because the filter is removeing the dust by having the air go though a thin material.

Hope it helps!

Answer:

Electron dot diagram is attached below

Explanation:

Sodium is alkali metal and present in group one. It has one valence electron. All alkali metal form salt when react with halogens.

Sodium loses its one electron to get stable.  While all halogens have seven valence electrons they need only one electron to get stable electronic configuration.

When alkali metals such as sodium react with halogen fluorine it loses its one valence electron which is accepted by fluorine and ionic bond is formed. The compound formed is called sodium fluoride.

Na + F   →   NaF

In cross and dot diagram electrons of one atom are shown as dots while other atom shown as cross to distinguish.

Electron dot diagram is attached below.

Answer:

The nucleus is a collection of particles called protons, which are positively charged, and neutrons, which are electrically neutral. Protons and neutrons are in turn made up of particles called quarks. The chemical element of an atom is determined by the number of protons, or the atomic number, Z, of the nucleus.