describe a chemical test for water. Give the test and the result​

Answer:

Because it lose detectable mass.

Explanation:

Law of conservation of mass states that substances involved in chemical reaction do not lose or gain any mass. So the above reactions don't demonstrate the law of conservation of mass because it lose mass

Answer:

B

Explanation:

There was time for the gas to escape from the rock bubbling at the surface

The hole in igneous rocks indicate that the magma cooled too quickly for gas to escape.

Igneous rocks are one of the three main rock types the other two including sedimentary and metamorphic rocks.These rocks are formed by cooling and solidification of lava or magma.

The magma is derived from partial melts in the planet's mantle or crust.Melting is caused by increase in temperature or decrease in pressure or even change in composition.Solidification occurs either below surface which is called as intrusive rocks or on the surface as extrusive rocks.

They are classified according to their texture,mode of occurrence,chemical composition,geometry and mineralogy of rock.The two important variables for classification are mineral composition and cooling history.

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Answer:

H- hydrogen

Explanation: Hydrogen is in the first group meaning that it only has 1 valence electron and 1 energy level

Answer:

Explanation:

h= e/v

6.022 x 10^23 = 4.36 x 10^-18/ v

v= 6.58 x 10^15

C= lambda x frequency

3.00 x 10^8= 6.58 x 10^15 x lambda

lambda (y)= 4.56 x 10^-8

Answer:

Explanation:

λ = hc/E

6.626 x 10^-34 J-s x 2.998 x 10^8 m-s^-1

                     4.36 x 10^-18 J

= 4556.13486239

= 4.56 x 10^1 nm

Answer:

4.13 moles of Fe.

Explanation:

Given data:

Moles of iron produced = ?

Moles of Fe₂O₃ = 3.5 mol

Moles of CO = 6.2 mol

Solution:

Chemical equation:

Fe₂O₃ +  3CO      →    2Fe + 3CO₂

Now we will compare the moles of iron with CO and Fe₂O₃.

                 Fe₂O₃        :         Fe

                      1             :          2

                  3.5             :         2/1×3.5 = 7 mol

                 CO              :          Fe

                   3               :            2

                 6.2              :        2/3×6.2 = 4.13 mol

The number of moles of iron produced by CO are less it will limiting reactant.

Thus, moles of iron formed in given reaction are 4.13 moles.

Answer:

Convert grams of Mg to moles

Explanation:

In stoichiometric calculations, the first thing is always to balance the chemical reaction equation. However, in this particular instance, the equation is already balanced; 2Mg + O2 ---------->2MgO as shown in the question.

Hence, what Niven now has to do is to convert grams of Mg to moles so that the amount of MgO obtained can be calculated and subsequently converted to mass.

1.calcium monohydroxid

2.sulfur dioxide

3.sry don't know

Answer:

6 Cl atoms

Explanation:

In one molecule of ZnCl2, we have 2 atoms of Cl

Therefore, in 3 molecules of ZnCl2, we'll have 3(2) atoms of Cl = 6 atoms of Cl.

please mark brainliest

Answer:

Who knows...

Explanation:

:( :( :( :( :(

Answer:

A is the correct option

Explanation:

batteries have chemical energy and will convert to electricity and when reached to bulb, it emits light as electromagnetic rays

Answer:

I think it's B

Explanation:

A and C are out of the equation because Earth's axis isn't tilted on them and has the entirety of Argentina covered in shadow. The only answer left would be B.

Explanation:

hydrogen and sodium are in same froup

Answer:

physical - cloth

                tree

                brick

                chair

                lights

                 glass

chemical-  fuel

                 fire

Explanation:

Answer:

We wouldn't have Coronavirus

Explanation:

Answer:

Gas(this is because we are only considering that there are 3 states of matter, while in reality there are 5.)

Explanation:

There are actually 4 states of matter excluding a 5th one that has just been discovered, but if we consider that there are only 3 states of matter then the particles move the fastest in gases. As the particles are the furthest apart.

Answer:

28.0134

Explanation:

Answer:

Explanation:

n=m/Mr

Molar mass =2(14)

n=1.80/28

n= 0.064

Answer:

C

Explanation:

collisions of galaxies

The low energy radiations found in space have been evident of collisions of galaxies. Thus, option C is correct.

Astronomers have been dealing with the stars, galaxies, and other space. Outer space has consisted of the various galaxies that have been continuously formed with collisions and movement.

The low energy radiations found in space have been because of the energy that has been liberated due to the collisions of the galaxies. Thus, option C is correct.

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Answer:

In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals. This is also useful for describing the chemical bonds that hold atoms together.

Answer:

scientists

Explanation:

Answer:

This means that waves need a medium to propagate, but light waves propagate where no particles are present. ...

Answer:You'd wind up with a pH-neutral substance.

Answer:

D

Explanation:

D: Both the motion of the particles in the substance and the temperature of the substance increase.

I Hope That This Helps!!!

Both the motion of the particles in the substance and the temperature of the substance increase.

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Answer:

P₂ = 1.03 atm

Explanation:

Given data:

Initial pressure = 1.00 atm

Initial temperature = 293 K

Final temperature = 303 K

Final pressure = ?

Solution:

According to Gay-Lussac Law,

The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.

Mathematical relationship:

P₁/T₁ = P₂/T₂

Now we will put the values in formula:

1.00 atm / 293 K = P₂/303 K

P₂ = 1.00 atm × 303 K / 293 K

P₂ = 303 atm. K /293 K

P₂ = 1.03 atm

A gas produced in a chemical reaction can be collected by water displacement. Because the gas is collected over water, it is not pure but is mixed with vapor from the evaporation of the water. Dalton's law can be used to calculate the amount of the desired gas by subtracting the contribution of the water vapor.

Explanation:

oxygen gas is collected bye the downwards displacement of water. because it is only slightly solube in water and is less dence than water. this is my answer

Mass of Fe₂O₃ : 74.26 g

Volume of O₂ at STP = 15.624 L

Reaction

4Fe (s) + 3O₂ (g) ==> 2Fe₂O₃ (s)

mol Fe :

Ar Fe = 56 g/mol

[tex]\tt \dfrac{52}{56}=0.93[/tex]

mol Fe₂O₃ :

[tex]\tt \dfrac{2}{4}\times 0.93=0.465[/tex]

mass Fe₂O₃ :

MW Fe₂O₃ : 159,69 g/mol

[tex]\tt 0.465\times 159,69=74.26~g[/tex]

mol O₂ :

[tex]\tt \dfrac{3}{4}\times 0.93=0.6975[/tex]

volume O₂ at STP(1 mol=22.4 L)

[tex]\tt 0.6975\times 22.4=15.624~L[/tex]

Answer:o It is important to realise that mixing will be small unless there are electrons in the 4a1 LUMO, this is why NH3 is pyramidal while BH3 is planar! ... This mixing is very strong and stabilises the 3a1 MO substantially and hence NH3 is trigonal pyramidal and not planar.

Explanation:

Answer:Liquid A: 0.358 g/ml

Liquid B: 0.605 g/ml

Liquid C: 1.677 g/ml

Explanation:

Liquid A: 0.358 g/ml

Liquid B: 0.605 g/ml

Liquid C: 1.677 g/ml