Which tool was used to collect the solid product of the chemical reaction? the balance the funnel with the filter paper the Erlenmeyer flask the beaker the watch glass With this tool, the could be separated from the .

Answer:Oxygen has 6 valence electrons

A=2

B=2

C=4

The charge of an oxygen Ion is -2

Explanation:

According to the electronic configuration,there are 6 valence electrons in an oxygen atom.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

Learn more about electronic configuration,here:

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Answer:

Air-drying clothes conserves more water than using an electric clothes dryer.

Answer:

H % = 11.11%

O % = 88.89%

Explanation:

atomic weight of H = 1

atomic weight of O = 16

each molecule of water contains 2 atoms of H and one atom of O

hence molecular weight of water = 18

H % = 2 x 100/18 = 11.11%

O % = 16 x 100/18 = 88.89%

Answer:

-H= 11.19%

-O= 88.81%

Explanation: the answer above mine is incorrect!,  i just did it and i got it right, the answer is h= 11.19% and O= 88.81% hope it helps!

Answer:

The correct option is -286 kJ

Explanation:

The given parameters are

C(s) + O₂(g) → CO₂(g)   ΔHf = -394 kJ

H₂(g) + 12O₂(g)→H₂O ΔHf = -242 kJ

2C(s) + 3H₂(g)→C₂H₆(g)  ΔH = -84 kJ

Te given equation is C₂H₆(g) + 7/2O₂(g) →2CO₂(g) + 3H₂O(l)

The heat of formation or enthalpy of combustion = Heat of formation of the products - Heat of formation of the reactants

The enthalpy of combustion of the reaction = 2*(-394) + 3*(-242)- ((-84)+7/2*0)) = -1,430 kJ

Given that the reaction consists of one mole of C₂H₆(g), we have;

The enthalpy of combustion of one mole of C₂H₆(g) = -1,430 kJ

Therefore, the enthalpy of combustion of 0.2 mole of C₂H₆(g) = -1,430 kJ × 0.2 = -286 kJ

The correct option = -286 kJ.

Answer:

Positive 1,430

Explanation:

Answer:

3.01

[tex] \times [/tex]

10-22

moles=mass/RMM

moles=140/28

=5moles

1mole=6.02*10-23

5moles=?

=3.01*10-22

hope this is helpful

Answer:

as mass and the square of speed is directly proportional to the the kinetic enegry so, more there will be mass and speed there will be more kinetic enegry.

Answer:

Subatomic particles are the proton (1 amu), neutron (1 amu), and electron (0 amu)

Explanation:

Atomic mass unit (amu; dalton): A unit of mass equal to exactly 1/12 the mass of one 12C atom, or 1.660538921 x 10−27 kg. This is the approximate mass of one proton or one neutron. It is the basis of atomic weights.

Answer:

[tex]\boxed{\mathrm{see \: below}}[/tex]

Explanation:

Protons have a mass of 1 amu (atomic mass unit).

Electrons have a mass of [tex]\frac{1}{1840}[/tex] amu (atomic mass unit).

Neutrons have a mass of 1 amu (atomic mass unit).

Answer:

CH3CH3, 1,3- dichloro-2,2- dibromo, 2-butyne, cyclopentane, 2,3- dimethylbut-2-ene, 2,2,4,4- tetramethlpenta-3-one.

Explanation:

This problem or question has to do with spectroscopy. Spectroscopy is one of the Important aspect of physical Chemistry. It is important because it helps in the identification of chemical samples or compounds. The Nuclear Magnetic field work generally on the principle of absorption of energy.

The following compounds as given in the question above shows singlet in the 1H NMR spectrum.

(1). CH3CH3: shows singlet in the 1H NMR spectrum at 0.86 ppm.

(2). 1,3- dichloro-2,2- dibromo; shows singlet.

(3). 2- butyne shows singlet

(4). Cyclopentane shows singlet.

(5). 2,3 - dimethylbut-2-ene shows singlet.

(6). 2,2,4,4- tetramethlpenta-3-one shows singlet.

Kindly note that I have used the IUPAC naming system to name the Compounds in the question above.

Answer:

X is sodium hydroxide (caustic soda, NaOH)

y is sodium (Na)

Explanation:

The process of industrial electrolysis of sodium chloride solution by which chlorine and sodium hydroxide (caustic soda) can be produced is known as the chlor-alkali process as follows;

2NaCl + 2H₂O → Cl₂ + H₂ + 2NaOH

Given that the compound X is formed from a element y which is in the form of a pellet, we have;

The element in the above reaction that can exist as pellet is the silver white metallic sodium pellet

Therefore, the compound X is NaOH and the element y is sodium, Na.

Answer: The added pressure could cause pilots to become disorinated

Explanation:

Answer:

When sound molecules stack up in front of high-speed flights, loud noises are produced that can damage the ears.

Answer:

Explanation:

A

Answer: Hg +2

Explanation:

Hg+2 is formed when mercury loses two electrons.

Hg  ------>  Hg +2  +  2 e-

Answer:

Hg+2 (D) is the correct answer

Explanation:

the person above me is correct, hope this helps, have a good one

Answer:

Cellular respiration:

[tex]C_6H_{12}O_6+6O_2\rightarrow 6CO_2+6H_2O[/tex]

Explanation:

Hello,

In this case, the law of conservation of mass states that matter cannot be created nor destroyed but modified, therefore, typical examples are the raft chemical reactions in nature or carried out in a laboratory. Thus, a typical one that could be daily found is in the cellular respiration wherein glucose and oxygen are converted into carbon dioxide, water and energy for us to use it in our daily activities. It is chemically represented by:

[tex]C_6H_{12}O_6+6O_2\rightarrow 6CO_2+6H_2O[/tex]

Law of conservation of mass is verified as six carbon atoms are before and after the chemical reaction, twelve hydrogen atoms are before and after it and eighteen oxygen atoms as well.

Best regards.

Answer:

The answer is Aluminum

Hope this helps you

Answer:

23 protons, 23 electrons, 33 neutrons

Explanation:

I don't know why my answer got deleted but no worries, I can answer again. The number of protons and electrons is equal to the atomic number which is 23 and the number of neutrons is 56 - 23 = 33 because atomic mass denotes the number of protons and neutrons.

Answer:

idk but i tryed

Explanation:

The simplest way to use the periodic table to identify an element is by looking for the element’s name or elemental symbol. The periodic table can be used to identify an element by looking for the element’s atomic number. The atomic number of an element is the number of protons found within the atoms of that element.

Answer:

C: The surroundings heat up and the system decreases in volume.

D: The surroundings heat up and the system does not change volume.

B: The surroundings heat up and the system expands in volume.

A: The surroundings get cold and the system decreases in volume.

Explanation:

The most exothermic reactions are those that release heat, that is to say, they give up the heat as it cools and the surroundings heat up.

As for endothermics, that is, those that absorb or capture the heat of the medium, they are variables that cool the environment that surrounds them and increase their internal temperature

Answer:

Sublimation

Explanation:

Sublimation refers to the process by which the change of matter takes place directly from solid to liquid state. The matter from the solid-state directly changes into the gaseous state without changing into the liquid state. More energy is required in this process. This is an endothermic reaction. Dry ice is the solid carbon dioxide sublimes in the air.

Answer:

Rutherford's atomic model explained how the electrons surrounded the nucleus of protons and neutrons. His model showed how J. J. Thomson's Plum Pudding model was incorrect.

Answer:Rutherford model of an atom shows that an atom is mostly an empty space,with electrons orbiting a fixed positively charged nucleus in set.

Explanation:

Explanation:

1 mol of Ba(OH)2 = 2 moles of HCl

Answer : The initial concentration of HI and concentration of HI at equilibrium is, 0.27 M and 0.386 M  respectively.

Solution :  Given,

Initial concentration of H_2 and I_2 = 0.11 M

Concentration of H_2 and I_2 at equilibrium = 0.052 M

Let the initial concentration of HI be, C

The given equilibrium reaction is,

    H_2(g)+I_2(g)\rightleftharpoons 2HI(g)

Initially               0.11   0.11            C

At equilibrium  (0.11-x) (0.11-x)   (C+2x)

As we are given that:

Concentration of H_2 and I_2 at equilibrium = 0.052 M  = (0.11-x)

The expression of K_c will be,

K_c=\frac{[HI]^2}{[H_2][I_2]}

54.3=\frac{(C+2(0.058))^2}{(0.052)\times (0.052)}

By solving the terms, we get:

C = 0.27 M

Thus, initial concentration of HI = C = 0.27 M

Thus, the concentration of HI at equilibrium = (C+2x) = 0.27 + 2(0.058) = 0.386 M

Answer:

131.26 g

Explanation:

From the balanced equation,

2 moles of N₂H₄reacts with 1 mole of N₂O₄ to give 3 moles of N₂

Now number of moles of N₂H₄ present in 100 g N₂H₄ is n = 100 g/molar mass N₂H₄.

Molar mass N₂H₄ = 2 × 14.01 g/mol + 1 × 4 g/mol = 28.02 g/mol + 4 g/mol = 32.02 g/mol

n₁ = 100/32.02 = 3.123 mol

Also

Now number of moles of N₂O₄ present in 200 g N₂O₄ is n = 200 g/molar mass N₂O₄.

Molar mass N₂O₄ = 2 × 14.01 g/mol + 16 × 4 g/mol = 28.02 g/mol + 64 g/mol = 92.02 g/mol

n₂ = 200/92.02 = 2.173 mol

Since the mole ratio of N₂H₄  to N₂O₄ is 2 : 1, We require 2 × 2.173 mol N₂H₄  to react with 2.173 mole N₂O₄  

Number of moles of N₂H₄ required is 4.346. But the number of moles of N₂H₄  present is 3.123 so N₂H₄  is the limiting reagent.

So, from the equation, 2 moles of N₂H₄ produces 3 moles of N₂

Therefore number of mole N₂ = 3/2 moles of N₂H₄ = 3/2 × 3.123 mol = 4.6845 mol

From n = m/M where n = number of moles of nitrogen gas = 4.6845 mol and M = molar mass of nitrogen gas = 28.02 g/mol and m = mass of nitogen gas.

m = nM = 4.6845 mol × 28.02 g/mol = 131.26 g

So the mas of nitrogen gas produced is 131.26 g

Answer:

# protones: 22

# neutrones: 26

# electrones: 22

Explanation:

El número atómico del titanio es 22. Este número atómico representa la cantidad de protones del átomo en cuestión. Así:

# protones: 22.

El número másico se define como la suma de protones y neutrones, así:

48 = 22 + # neutrones

26 = # neutrones

Un átomo es neutro, esto quiere decir que sus cargas positivas y negativas son iguales (Protones: cargas positivas; Electrones: Cargas negativas).

Así, el # protones = # electrones = 22

Answer:

The boiling point of the substances

Explanation:

Because Boiling point is an intensive property.

Answer:

% purity of limestone = 96.53%

Explanation:

Question (4).

Weight of impure CaCO₃ = 25.9 g

Molecular weight of CaCO₃ = 40 + 12 + 3(16)

                                              = 100 g per mole

We know at S.T.P. number of moles of CO₂ = 1 and volume = 22.4 liters

From the given reaction, 1 mole of CaCO₃ reacts with 1 mole or 22.4 liters of

CO₂.

∵ 22.4 liters of CO₂ was produced from CaCO3 = 100 g

∴ 1 liter of CO₂ will be produced by CaCO₃ = [tex]\frac{100}{22.4}[/tex]

∴ 5.6 liters of CO₂ will be produced by CaCO₃ = [tex]\frac{100\times 5.6}{22.4}[/tex]

                                                                              = 25 g

Therefore, % purity of CaCO₃ = [tex]\frac{\text{Weight calculated}}{{\text{Weight given}}}\times 100[/tex]

                                                 = [tex]\frac{25}{25.9}\times 100[/tex]

                                                 = 96.53 %

Answer

Climate, because this describes what the weather is like over a long period of time.

Answer:

because it showed how the electron could orbit the nucleus without falling into it.