I REALLY NEED HELP can someone help me please I’ll make you brainliest ! :)

H2O or just water if you need to be simple

Answer:

total 11+14 is 25

now 4 are common and counted twice so subtract 4 so answer is 21

Answer:

yes i can help you ig ........

Oxygen gas produced : 0.7 g

Given

10.0 grams HgO

9.3 grams Hg

Required

Oxygen gas produced

Solution

Reaction⇒Decomposition

2HgO(s)⇒2Hg(l)+O₂(g)

Conservation of mass applies to a closed system, where the masses before and after the reaction are the same

mass of reactants = mass of products

mass  HgO = mass Hg + mass O₂

10 g = 9.3 g + mass O₂

mass O₂ = 0.7 g

Answer:

just the process or action of moving or being moved lol

Explanation:

Refer to attachment.

The Lewis dot  structure of the following compounds is attached in the attachment 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.

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Answer:

b

Explanation:

The conserved quantities obeys the conservation laws. Among the given options mechanical energy and mass are examples of conservable quantities. The correct option is C.

A conserved quantity is defined as something which remains constant in amount over time and it cannot be created nor destroyed. In an isolated system, energy is an example of a conserved quantity.

The conserved quantities can change form one state to another, for example from light to heat, but the total amount of energy in the system will not change. Some of the other examples of conserved quantities are electric charge, momentum and angular momentum.

The mass can neither be created nor be destroyed, so it is a conserved quantity. Similarly the mechanical energy which is the sum of potential and kinetic energy is also conserved.

Thus the correct option is C.

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Answer:

Gas Bubbles Appear. Gas bubbles appear after a chemical reaction has occurred and the mixture becomes saturated with gas.

Formation of a Precipitate.

Color Change.

Temperature Change.

Production of Light.

Volume Change.

Change in Smell or Taste.

Answer:

3.91 mmHg

Explanation:

From the question given above, the following data were obtained:

Initial volume (V₁) = 120 L

Initial pressure (P₁) = 1.5 mmHg

Initial temperature (T₁) = 10 °C

Final volume (V₂) = 50 L

Final temperature (T₂) = 34 °C

Final pressure (P₂) =?

Next, we shall convert 10 °C and 34 °C to Kelvin temperature. This can be obtained as follow:

T(K) = T(°C) + 273

Initial temperature (T₁) = 10 °C

Initial temperature (T₁) = 10 °C + 273

Initial temperature (T₁) = 283 K

Final temperature (T₂) = 34 °C

Final temperature (T₂) = 34 °C + 273

Final temperature (T₂) = 307 K

Finally, we shall determine final pressure of the gas as follow:

Initial volume (V₁) = 120 L

Initial pressure (P₁) = 1.5 mmHg

Initial temperature (T₁) = 283 K

Final volume (V₂) = 50 L

Final temperature (T₂) = 307 K

Final pressure (P₂) =?

P₁V₁/T₁ = P₂V₂/T₂

1.5 × 120/283 = P₂ × 50 / 307

Cross multiply

P₂ × 50 × 283 = 1.5 × 120 × 307

P₂ × 14150 = 55260

Divide both side by 14150

P₂ = 55260 / 14150

P₂ = 3.91 mmHg

Thus, the new pressure of the gas is 3.91 mmHg

Answer:

The value is  [tex]x = 0.0227 \ M[/tex]

Explanation:

From the question we are told that

     The concentration of [tex]KCN \ \ i.e \ \ CN^{-}[/tex] is  [tex]M_1 = 0.091 \ M[/tex]

     The solubility product constant for [tex]NiS[/tex] is  [tex]K_{sp} = 3.0 *10^{-19}[/tex]

     The stability  constant for [tex]Ni(CN)_4 ^{2-}[/tex] is  [tex]K_f = 1.0 *10^{31}[/tex]

Generally the dissociation  reaction for NiS is  

       [tex]Ni S \underset{}{\stackrel{}{\rightleftharpoons}} Ni^{2+} + S^{2-}[/tex]

Generally the formation reaction for [tex]Ni(CN)_4 ^{2-}[/tex]   is  

      [tex]4CN^- + N_i ^{2+} \underset{}{\stackrel{}{\rightleftharpoons}} \ Ni(CN)^{2-}_{4}[/tex]

Combining both reaction we have

      [tex]4CN^ - + NiS \ \underset{}{\stackrel{}{\rightleftharpoons}} \ Ni(CN)^{2-}_4 + S^{2-}[/tex]

Gnerally the equilibrium constant for this reaction is  

         [tex]K_c = K_{sp} * K_f[/tex]

=>       [tex]K_c = 3.0 *10^{-19 } * 1.0 *10^{31}[/tex]  

=>       [tex]K_c = 3.0*10^{12}[/tex]

Generally the I C E  table for the above reaction is  

                     [tex]4CN^ - \ \ \ + \ \ \ NiS \ \ \ \ \ \ \ \underset{}{\stackrel{}{\rightleftharpoons}} \ \ \ \ \ Ni(CN)^{2-}_4 \ \ \ \ \ \ \ \ \ + \ \ \ \ \ \ \ \ \ S^{2-}[/tex]

initial [ I]        0.091                                              0                                    0

Change [C]        -4x                                                 +x                                    + x

Equilibrium [E ]   0.091 - 4x                                      x                                        x

Here is  x is the amount in term of concentration that is lost by [tex]CN^-[/tex]  and gained by   [tex]Ni(CN)_4 ^{2-}[/tex]  and  [tex]S^{2-}[/tex]

Gnerally the equilibrium constant for this reaction is mathematically represented as

              [tex]K_c = \frac{[Ni (CN)_4^{2-} ] [S^{2-} ] }{ [CN^{-}]^4}[/tex]

=>             [tex]3.0*10^{12} = \frac{x * x}{ [0.091 - 4x ]^4}[/tex]

=>              [tex]3.0*10^{12}* [0.091 - 4x ]^4 = x^2[/tex]

=>              [tex][0.091 - 4x ]^4 = \frac{x^2}{3.0*10^{12}}[/tex]

=>              [tex][0.091 - 4x ] = \sqrt[4]{ \frac{x^2}{3.0*10^{12}}}[/tex]

=>              [tex][0.091 - 4x ] = \frac{\sqrt{x} }{1316}[/tex]

=>              [tex]119.8 - 5264x =\sqrt{x}[/tex]

Square both sides

                 [tex](119.8 - 5264x)^2 =x[/tex]

=>               [tex]14352.04 - 1261255 x + 27709696x^2 = 0[/tex]

=>                [tex]27709696x^2 - 1261255 x + 14352.04 = 0[/tex]

Solving using quadratic equation

   The value of x  is  [tex]x = 0.0227 \ M[/tex]

Hence the amount in terms of  molarity (concentration) of  [tex]Ni(CN)_4 ^{2-}[/tex]  and  [tex]S^{2-}[/tex] produced at equilibrium is [tex]x = 0.0227 \ M[/tex] it then means that the amount of  NiS (nickel(II) sulfide) lost at equilibrium is  [tex]x = 0.0227 \ M[/tex]

So the molar solubility of nickel(II) sulfide at equilibrium is  

        [tex]x = 0.0227 \ M[/tex]

Answer:

Physical change

Explanation:

A physical change is one in which no new substance is formed and can be reversed using physical methods.

When we mix the salt and water, we have merely carried out a physical change. No new substance was formed. To recover the salt, we simply heat the solution to dryness.

Hence, this is an example of a physical change.

Answer:

D

Explanation:

PE highest at top of waterfall, 0 at bottom, while 0 KE at top and max KE at bottom. PE becomes KE as water falls down the waterfall

When, particles starts moving they gain a kinetic energy. During waterfalls the potential energy is converting to kinetic energy. Hence, option D is correct.

Kinetic energy is a form of energy generated by virtue of the motion of an object. Whereas potential energy is generated by virtue of the position of the object. Potential energy is stored in an object when it is in rest.

Kinetic energy is gained by the movement of particles. When particles starts moving by a force or with the aid of thermal energy, they acquire the energy for displacing from their position where, their potential energy get reduced by moving.

When water is trapped in a dam it is in rest and it have only potential energy. But when it is flowing it have some kinetic energy and if it is falling down, the energy will be higher by the downward force of gravitation and thus gains more kinetic energy. Thus, option D is correct.

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I don't care but one another time and I have any questions about this email

Answer:

ь

They slow down

Explanation:

Answer: most similar o magnesium : strontium

least similar to magnesium : selenium

Explanation:

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.  

Magnesium forms a cation having an oxidation state of +2 called as [tex]Mg^{2+}[/tex] and oxygen forms an anion with oxidation state of -2. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral [tex]MgO[/tex]

Thus an element which will form cation with same oxidation state of +2 will be strontium and form [tex]SrO[/tex].

Lithium and potassium both belong to group 1 and thus will form cations with  oxidation state of +1 and form [tex]Li_2O[/tex] and [tex]K_2O[/tex] respectivley.

Selenium is a non metal and thus will form covalent compound with formula [tex]SeO_2[/tex]

Answer:

im going to go with the water is less dense than the glycerol

Explanation:

Answer:

weather is the state of the air at a particular place and time.

Explanation:

weather can be warm or cold, dry or wet, windy or cloudy

Answer:

2

Explanation:

From the question given above, the following data were obtained:

Molarity of HCl = 0.01 M

pH =?

Next, we shall determine the concentration of the hydrogen ion, [H⁺] in the pool. This can be obtained as follow:

HCl (aq) <=> H⁺ (aq) + Cl¯ (aq)

From the balanced equation above,

1 mole of HCl produced 1 mole of H⁺.

Therefore, 0.01 M HCl will also produce 0.01 M H⁺.

Thus, the concentration of the hydrogen ion, [H⁺] in the pool is 0.01 M

Finally, we shall determine the pH of the pool.

This can be obtained as follow:

Concentration of the hydrogen ion [H⁺] = 0.01 M

pH J?

pH = – Log [H⁺]

pH = – Log 0.01

pH = 2

Therefore, the pH of the pool is 2.

kaloy also pala spark kabootan paano

Answer:

east

Explanation:

Astronauts appear to be bouncing on the moon because the force of gravity is weaker on the moon.

On planets such as Earth and natural satellites such as the moon, gravity causes objects are pulled towards the center of the planet/natural satellite.

On the moon, this force is weaker than on the Earth. Indeed, the gravity of Earth is equivalent to 9,807 m/s, while the gravity on the moon is 1,62 m/s.

This causes objects are still pulled towards the center of the moon but they are pulled with a much weaker force. Therefore, when people walk on the moon they seem to bounce.

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Answer:

B.moving towards each other

Answer:

B. moving towards

they move towards each other to create the trench

Answer: methyl orange indicator

Explanation: Any indicator is actually suitable since the pH range is very high for strong acid and strong base reaction. You could also use phenolphthalein and methyl red indicator

Answer:  The answer is [tex]8.4\times 10^8[/tex]

Explanation:

Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.

The rule apply for the multiplication and division is :

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

Thus for product of  [tex](2.1\times 10^3)\times (4\times 10^5)[/tex]

In this problem, 2.1has 2 significant figures and 4 is an exact number with infinite significant digits thus product will have the least number of significant figures which is 2. So, the answer will be in 2 significant figures.

Therefore, the answer is [tex]8.4\times 10^8[/tex]

Answer:

20, 50, 25

Explanation:

I just figured it out somehow in my brain.

Answer:

C. Changing shape and volume

Explanation:

If a volume is fixated it can't have free motion/roam like your typical liquid.

Answer:

why did you delete my answer?

Explanation:

The answer is C. It was formed by a series of volcanic eruptions.

The geologist conclude about how the mountain formed should be option c. t was formed by a series of volcanic eruptions.

It is the eruption where the lava and the gas should be released from the volcano. Also, it is the dangerous eruption type that we known as the glowing avalanche.

At the time when the geologist is study the mountain so each comprise of layers of igneous rock. so it should be created by the  series of volcanic eruptions.

hence, the option c is correct.

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Explanation:

Well, the qualitative significance of a chemical equation is that it shows us concisely, and economically how matter interacts chemically in the breaking, and making of chemical bonds to form new substances…

Quantitatively, ALL stoichiometrically balanced equations show us that MASS is CONSERVED, and that “TANSTAAFL” , i.e. “there ain’t no such thing as a free lunch” , operates. And so 5∙g , 5∙kg , 5∙tonne of total REACTANT from all sources, leads to AT MOST to 5∙g , 5∙kg , 5∙tonne of total PRODUCT…. and in practice, we are not even going to get that… Electronic charge is also conserved in every chemical reaction … and we use this conservation principle when we write redox equation…

Chemical equations are the symbolic expression of the compounds and elements. It shows the quality and quantity by the chemical interaction and stoichiometry coefficient.

A chemical equation expresses the chemicals of the reactant and the product side in the form of symbols and mathematical expressions. They are quantitatively significant as they represent the stoichiometry coefficient. It tells about the moles needed by the reactants needed for product formation.

They also are qualitatively important as they depict the phases of the reactants and the products and tell the type of reaction like the decomposition, oxidation, reduction, combustion, etc. undergone by the substances.

Therefore, the chemical equation is significant both qualitatively and quantitatively.

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Answer:

0.00000000910938;

9.109380 * 10^-9

Explanation:

Given the question :

Given :

1.602176*10-¹⁹/ 1.758820*10¹¹

The numbers are expressed in the form:

A * 10^b ; Where;

A = Coefficient ; 10 = base ; b = exponent

The Coefficients can be divided directly as :

1.602176 / 1.758820 = 0.9109380

Using the division law of indices, the exponents acn be worked out as follows since they have the same base :

10^-19 / 10^-11 = 10^(-19 - (-11)) = 10^(-19+11) = 10^-8

Thus, we have ;

0.9109380 × 10^-8

In standard form:

9.109380 * 10^-9

In Expanded form:

10^-8 = 0.00000001

0.9109380 * 0.00000001 = 0.00000000910938

0.000000009 +

0.0000000001 +

0.00000000000 +

0.000000000009 +

0.0000000000003 +

0.00000000000008

__________________

0.00000000910938

___________________