When hydrochloric acid reacts with sodium sulfide, hydrogen sulfide gas and sodium chloride are produced. How many moles of H2S will be generated by 2.56 moles of HCl?

2HCl + Na2S → H2S + 2NaCl

Answer: Carlos Slim becomes the first Mexican and person from an emerging economy to top Forbes Richest Person list, with net worth of US$53.5 billion

Radiation science is deadly to humans/ living organisms because it can cause damage to our cells and cancer.

Explanation:

Answer:

x = 5

Because 12 + 13 = 5x

25 = 5x

x = 5

Answer:

5

Explanation:

Mary had 5 dollars she owe her friend Mia 13 dollars but she didn't have enough. so multiply how much she has to give to mia

Answer:

B

Explanation:

The others are alloys and therefore do not appear on the periodic table

Lead is the correct answer as it is an element, which is a pure substance made up of one type of atom, unlike bronze, brass, and steel, which are alloys.

When asked which of the following is a pure substance made up of one type of atom, the correct answer is B) lead. An element is defined as a pure substance that cannot be broken down into simpler substances by chemical means and consists of one type of atom. Therefore, lead, which is an element, fits this description perfectly.

It's important to note that, unlike lead, bronze, brass, and steel are alloys, which are mixtures of two or more elements, with at least one being a metal. Bronze is an alloy of copper and tin, brass is an alloy of copper and zinc, and steel is an alloy typically made of iron and carbon. Each of these is not a pure substance because they contain more than one type of atom.

When hot magma cools, igneous rocks are formed.

b) When graphite is under higher pressure and heat, it becomes diamond.

c) Igneous rocks include pumice and granite and can be formed above Eath's surface.

d) Metamorphic rocks are formed when existing rocks are changed inside Earth.

Magma is the molten rocks that is found inside Earth’s surface. Its the lava that is stored inside the Earth’s surface. This magma formes out of the Earth's surface during a volcanic eruption, or cools inside the Earth's surface itself to form igneous rock.

Graphite and diamond both are the allotropes of carbon. This is the change in allotropes which can occur in extreme cases of temperatures or pressure which can occur inside the Earth’s surface. This can change graphite to diamond.

Igneous rocks which are externally formed are pumice or basalt which forms when lava comes out of Earth's interior and cools to form rock. Whereas the Igneous rocks like granite are formed when the magma cools inside the Earth’s surface due to cooling of lava.

Metamorphic rocks are formed when the Igneous or sedimentary rocks undergoes conditions of severe temperature or pressure from inside the Earth's surface and the structure of the rock fully changes. This is how the metamorphic rocks form.

Answer:

a) When hot Magma cools, igneous rocks are formed.

b) When Graphite is under higher pressure and heat, it becomes diamond.

c) Igneous rocks include pumice and granite and can be formed above Earth's surface.

d) Metamorphic rocks are formed when existing rocks are changed inside Earth.

Explanation:

The concentration of hydroxide ion is  5  [tex]\times[/tex] 10^ − 14  M.

Explanation:

Consider the equilibrium of this acid's dissociation,

                          H C l O 4  ⇌  H +  +  C l O  4 -

Moreover, let's assume that  H C l O 4  is a strong acid and will fully dissociate.

Hence,

                              [ H + ]  =  0.20  M

Now, recall,  

                  K w  =  [ H + ] [ O H − ]  =  1.0  [tex]\times[/tex] 10 ^− 14

Hence,

                  ⇒ [ O H − ]  =  K w  / [ H + ]  = 5  [tex]\times[/tex] 10^ − 14  M.

The energy is generally not needed immediately, so it is used to combine ADP with phosphate ions to form ATP molecules. During the process of cellular respiration, carbon dioxide is given off as a waste product. This carbon dioxide can be used by photosynthesizing cells to form new carbohydrates.

Answer:

w

Explanation:

Answer:

a. there is no change in color

also when you mix sugar in water it dissolves which is a physical change :)

Answer:

[tex]\frac{p_1 V_1}{T_1}=\frac{p_2 V_2}{T_2}[/tex]

Explanation:

The equation of state (combined gas law) for an ideal gas states that

[tex]pV=nRT[/tex]

where

p is the gas pressure

V is the volume of the gas

n is the number of moles of the gas

R is the gas constant

T is the absolute temperature of the gas

The equation can be rewritten as

[tex]\frac{pV}{T}=nR[/tex]

For an ideal gas that undergoes a transformation, if the amount of gas remains the same, the term on the right of the equation remains constant. This means that the ratio

[tex]\frac{pV}{T}[/tex]

for the gas remains constant, and therefore we can rewrite the equation as

[tex]\frac{p_1 V_1}{T_1}=\frac{p_2 V_2}{T_2}[/tex]

where 1 indicates the initial conditions of the gas while 2 indicates the conditions of the gas after the transformation.

Answer:

f

ExplaOV, T = P₂72

natifon:

Answer:

1.  Dipoles

2. London Dispersion

3. weaker

4. long distances

5.easy

Explanation:

Answer:

18098

Explanation:

18. Reaction will occur.

19. Reaction Will occur.

20. Reaction will occur.

21. Reaction will occur.

22. Reaction won't occur.

23. Reaction will occur.

24. Reaction will occur.

25. Reaction won't occur.

The reaction rate of the metals with water, steam, acid, or hydroxides or their inert behavior towards them are noted in the metal activity series.

It contains all the metals one after the other which and the upper metal can replace the lower metal from its salt.

Calcium can replace hydrogen from acid, so the reaction will occur in 18. The products formed are calcium phosphate and hydrogen gas.

Chlorine is more reactive than bromine. So it can replace bromine from its salt to from bromine gas and magnesium chloride.

Aluminium can replace iron from its salt. So it will form aluminium oxide and iron metal. This reaction is used to obtain iron from ores.

Zinc can replace hydrogen from acid. So the products will be zinc chloride and hydrogen gas.

Chromium cannot displace hydrogen form water. So the reaction won't occur.

Tin can replace hydrogen form acid. So the reaction will proceed.

Magnesium will replace platinum from its salt. So magnesium oxide and platinum will form.

Bismuth cannot replace hydrogen from acid. So the reaction won't proceed.

Decrease in temperature is -126.0°C

Explanation:

Using Charles law we can set up the equation as,

V₁/T₁ = V₂/T₂

(2.00 L) / 294.0 K) = (1.00 L) / (x)

cross multiply to get:

2x = 294

2x/2 = 294/2

x = 147.0 K

Now kelvin is converted into Celsius by subtracting 273 from 147 as,

147 - 273 = -126°C

Given that:

Volume,

Temperature,

By using Charles Law, we get

→ [tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]

By substituting the values, we get

 [tex]\frac{2.00}{294.0} = \frac{1.00 \ L}{x}[/tex]

    [tex]2x = 294[/tex]

      [tex]x = \frac{294}{2}[/tex]

         [tex]= 147.0 \ K[/tex]

By converting "Kelvin" into "Celsius", we get

= [tex]147-273[/tex]

= [tex]- 126^{\circ} C[/tex]

Thus the response above is correct.

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Neils Bohr

Development of the Atomic Theory. In 1913, Neils Bohr, a student of Rutherford 's, developed a new model of the atom. He proposed that electrons are arranged in concentric circular orbits around the nucleus. This model is patterned on the solar system and is known as the planetary model.

Answer: Neils Bohr

Explanation:  In 1913, Neils was a student of Rutherford 's. He developed a new model of the atom. He explained that electrons are orignized in concentric circular orbits around the nucleus. This model is patterned on the solar system and is known as the planetary model.

go to abcte.org

Answer:

Explanation:

Chemical reactions involve the transformation of substances, called reactants, by breaking some bonds and forming new bonds, to obtain different substances called the products.

In the chemical reactions the atoms of the reactants are rearranged giving rise to the products, which will contain the same atoms but bonded differently or even as separate elements.

Using chemical reactions the human being can, for example, produce chlorine from sodium chloride solutions (from the oceans). In the same reaction, caustic soda (sodium hydroxide, NaOH) and hydrogen gas (H₂), are produced as by-products.

The properties of the products of a chemical reaction are very different from those of the reactants: sodium chloride is consumed by the humans every day in almost every meal, while chlorine and caustic soda are lethal if human beings consume them in some way.

Some examples of the variety of products produced from chemical reactions include:

The list could be huge, because most of the things that the human being use are manufactured using chemical reactions.

D. Even though the temperature is the same, container B has more thermal energy, since it has more liquid than container A.

Explanation:

Whenever there is an increase in the volume of the pink liquid, it is due to the increase in temperature.

When the temperature increases, the molecules move farther apart as much as possible.

When the molecules moves apart from each other and collide with each other, so that its kinetic energy also increases, So thermal energy of the container B is more compared to the container A.

Final answer:

Container B has more thermal energy because it holds more liquid than container A, resulting in more total kinetic energy among its molecules, despite both containers having the same temperature.

Explanation:

The correct answer to the student's question is D. Even though the temperature is the same, container B has more thermal energy since it has more liquid than container A. Thermal energy depends on both the temperature of the liquid and the amount of substance that is present. In this case, despite having the same temperature, the larger volume of liquid in container B contains more molecules. Each molecule possesses a certain amount of kinetic energy due to its movement, so more molecules mean more total kinetic energy, which results in higher thermal energy. It's important to note that thermal energy is an extensive property; it depends on the amount of matter, so the more liquid there is (assuming everything else is constant), the more thermal energy there will be.

Answer:

When a turtle is lying on a sunny riverbank, it’s body temperature rises and when it starts swimming in a cool river, it's body temperatures drop.

Explanation:

Cold-blooded animals, like turtles, do not have an internal feedback loop that regulates constant body temperature – as warm-blooded animals do. Their body temperatures fluctuate with that of the environment. This is why you see animals like lizards basking on rocks to raise their body temperatures. When it too hot, then they seek the shade under these rocks to lower their temperatures.

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The momentum of the object is 1500 kgm/s.

The law of conservation of momentum states that without effect of any external force in the system, the momentum of the system remains conserved. And momentum is defined as the product of the mass and velocity of the object.

Here, the mass of the 1st body = 200kg.

The mass of the 2nd body = 150kg.

Velocity of the 1st body = 15 m/s.

Velocity of the 2nd body = - 10 m/s.

So, the total momentum of the system before collision = [tex]200\times15 + 150\times{-10[/tex] kgm/s

= 1500 kgm/s.

After the collision, the body sticks together.

So, the total mass =200+150 kg = 350 kg.

Momentum remains conserved. So the momentum of the body= 1500 kgm/s.

Answer:

108 N

Explanation:

F = m × a

Force equals mass × acceleration, for more you can see Newton's second law.

Answer:

                    Polyatomic Ionic Compound

Explanation:

                     In given statement the compound given is called as Sodium oleate this means that when Oleic acid is treated with NaOH then it forms.

                     In chemistry there are few species which are involved in the formation of compounds.

  (i) Atoms:

                  It is very common that atoms of different elements combine to form compound through covalent bond. For example, H₂, O₂, N₂, F₂ e.t.c.

   (i) Ions:

                  Other than covalent compounds we have ionic compounds. Ionic compounds are made up of ions. These ions forming the ionic compounds can be monatomic like Na⁺, Br⁻, Mg²⁺, Al³⁺, N⁻³ or they can be polyatomic like CO₃²⁻, SO₄²⁻, NH₄⁺, PO₄³⁻ e.t.c.

    (iii) Polyatomic Ions:

                                     In polyatomic ions we find a charge on a molecule which contains two or more atoms bonded covalently. Hence, in given compound we have a long chain of molecule containing a negative charge neutralized by opposite +ve charged sodium ion. Hence, Sodium oleate is a polyatomic ionic compound.

Answer: 15.7 g CO2

Explanation: Solution attached:

CaCO3 => CaO + CO2

Convert mass of CaCO3 to moles.

Use the mole ratio of CaCO3 and CO2 from the balanced equation.

Convert moles of CO2 to mass using its molar mass.

A mineral is defined by its crystalline structure, solid state, naturally occurring and inorganic nature, and definite chemical composition. Therefore, 'a variable chemical composition' is not a characteristic of a mineral. The correct option is: D.

To determine which factor is not a characteristic of a mineral, we need to understand the key properties that define a mineral.

A mineral is characterized by the following:

Given this definition, the correct answer to the question is:

Minerals have a definite chemical composition, which makes option D incorrect.

Answer:

225000

N/m

Explanation:

Final answer:

The spring constant is 5 N/cm.

Explanation:

The equation for elastic potential energy is given as:

U = 1/2kx^2

Where:

In this case, we are given that the elastic potential energy is 45 J and the displacement is 2 cm. Substituting these values into the equation, we get:

45 J = 1/2k(2 cm)^2

Simplifying, we find:

45 J = 2k cm^2

Solving for k, we divide both sides by 2(2 cm)^2:

k = 45 J / 2(2 cm)^2

k = 5 N/cm

Therefore, the spring constant is 5 N/cm.

Answer:

Molar mass of Na2HPO4=141.96, of Na2HPO4. 12H2O = 358.14: so to get the same 0.4 M: 28.65/358.14*141.96 g, add water until you reach 200ml , dissolve all solid and then filter to make sterile.

Explanation:

141g/mol is the molecular mass of Na[tex]_2[/tex]HPO[tex]_4[/tex].  It is also known as molecular weight. It is computed by multiplying the mass of every atom.

The quantity of mass associated with such a molecule is referred to as its molecular mass. It is also known as molecular weight. It is computed by multiplying the mass of every atom by the amount of atoms from the element in the molecule. Water, for example, is composed of two hydrogen atoms and one oxygen atom.

The total of the atomic weight of the atoms within a molecule yields the molecule's molecular mass. The molecular mass expresses the mass of such a molecule in relation to the mass of both the 12C atom, which itself is assumed to be 12.

Molecular mass = Molar mass of sodium×2+ molar mass of hydrogen + molar mass of phosphorus+ 4 molar mass of oxygen

Molecular mass = 23×2+1 + 30+ 4× 16=141g/mol

Therefore, 141g/mol is the molecular mass of Na[tex]_2[/tex]HPO[tex]_4[/tex].

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Answer:

Smaller; products; products  

Explanation:

aA  + bB ⇌ cC + dD

[tex]K_{\text{eq}} = \dfrac{\text{[C]}^{c}\text{[D]}^{d}}{\text{[A]}^{a}\text{[B ]}^{b}}\\\\\text{When the $K_{\text{eq}}$ is large, the number representing [A]$^{a}$[B ]$^{b}$ must be $\textbf{smaller}$ than the}\\\text{number representing [C]$^{c}$[D]$^{d}$. This relationship means that the $\textbf{products}$ must be favoured}\\\text{and that the mixture at equilibrium is largely $\textbf{products}$.}[/tex]

The question is incomplete, complete question is :

For the following chemical reaction, what mass of sodium chromate in grams will be needed to produce 5.17 mol of sodium nitrate?

[tex]2AgNO_3 + Na_2CrO_4\rightarrow Ag_2CrO_4 + 2NaNO_3[/tex]

Answer:

418.77 grams of sodium chromate is needed to produce  5.17  mol es of sodium nitrate.

Explanation:

[tex]2AgNO_3 + Na_2CrO_4\rightarrow Ag_2CrO_4 + 2NaNO_3[/tex]

According to reaction, 2 moles of sodium nitarte is obtained from 1 mole of sodium chromate .

Then 5.17 moles of sodium nitarte will be obtained from :

[tex]\frac{1}{2}\times 5.17 mol=2.585 mol[/tex] of sodium chromate

Mass of sodium chromate :

[tex]2.585\times 162 g/mol=418.77 g[/tex]

418.77 grams of sodium chromate is needed to produce  5.17  mol es of sodium nitrate.

Answer:

it is 10

Explanation:

Answer:

10

Explanation:

Answer:

A) Cl2; 1.81:1

Explanation:

We have different gas laws that shows the relationship between pressure , volume , moles and temperature of a gas .

The gas laws that we generally study are :

Let us study about Boyle's Law :

According to it at constant temperature , the volume of a gas varies inversely with the pressure applied on a  gas .

That is : P∞1/v

Or, PV=K (constant )

If we a gas whose volume is changed from V₁ to V₂ and Pressure is changed from P₁ to P₂then we have :

P₁V₁=P₂V₂

[tex]K = PV[/tex] is the mathematical relation between the pressure and volume of the gas when K is given.

At constant temperature, the volume (V)of an ideal gas is inversely proportional to the pressure(P) of the gas.

[tex]P = \dfrac 1V\\\\K = PV[/tex]

Where,

[tex]P[/tex]- the pressure of the gas

[tex]K[/tex] - gas constant

[tex]V[/tex] - the volume of gas

Therefore, [tex]K = PV[/tex] is the mathematical relation between the pressure and volume of the gas when K is given.

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Answer:

Explanation:Artificial selection is distinct from natural selection in that it describes selection applied by humans in order to produce genetic change. When artificial selection is imposed, the trait or traits being selected are known, whereas with natural selection they have to be inferred. In most circumstances and unless otherwise qualified, directional selection is applied, i.e., only high-scoring individuals are favored for a quantitative trait. Artificial selection is the basic method of genetic improvement programs for crop plants or livestock (see Selective Breeding). It is also used as a tool in the laboratory to investigate the genetic properties of a trait in a species or population, for example, the magnitude of genetic variance or heritability, the possible duration of and limits to selection, and the correlations among traits, including with fitness.

Wheat plants that produce much larger grains are most likely a result of artificial selection. Therefore, option C is correct.

Artificial selection, also known as "selective breeding”, is where humans select for desired traits in agricultural products or animals, rather than leaving the species to germinate and alter gradually without human interference, like in natural selection.

Agriculture has traditionally utilised artificial selection to breed crops and animals with desired features. Today's meats are the result of carefully bred birds, cattle, sheep, and pigs.

By artificial selection, several fruits and vegetables have been enhanced or even invented.

Thus, Wheat plants that produce much larger grains are most likely a result of artificial selection, option C is correct.

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Your question is incomplete, most probably your question was

which trait is most likely a result of artificial selection?

A. Chickens, cattle, lambs, and pigs have been selectively bred to produce the available meats we eat today.

B. Artificial selection has enhanced or even developed several fruits and vegetables.

C. Wheat plants that produce much larger grains

D. all of the above