Which equation is NOT balanced? a. 2H2 + O2 → 2H2O c. Fe2O3 + 3H2 → 2Fe + 3H2O b. 4NH3 + 5O2 → 4NO + 6H2O d. 3H2 + 2O2 → 2H3O

D. Hippocrates

As quoted from Wikipedia, "he is often referred to as the "Father of Medicine"[1] in recognition of his lasting contributions to the field as the founder of the Hippocratic School of Medicine."

I hope this helps!

Cheers, July.

Answer:

190 °C  

Step-by-step explanation:

The pressure is constant, so this looks like a case where we can use Charles’ Law:  

V₁/T₁ = V₂/T₂      Invert both sides of the equation.  

T₁/V₁ = T₂/V₂      Multiply each side by V₂

T₂ = T₁ × V₂/V₁

=====

V₁ = 3.75 L; T₁ = (37 + 273.15) K = 310.15 K  

V₂ = 5.6 L;   T₂ = ?  

=====

T₂ = 310.15 × 5.6/3.75

T₂ = 310.15 × 1.49

T₂ = 463 K

t₂ = 463 – 273.15

t₂ = 190 °C

b2+ + 2 NO3- + 2 Na+ + 2 I- >> PbI2 (s) + 2 Na+ + 2 NO3-  

net ionic

Pb2+ + 2 I- >> PbI2  

Ksp = [Pb2+] [I-]^2  

Ksp = 7.1 x 10^-9  

molar solubility

let x = mol/L of Pb2+ that dissolve . This will give x mol/L Pb2+ and 2x mol/L I-  

7.1 x 10^-9 = (x) (2x)^2 = 4x^3  

molar solubility = 0.0012 M

~~thanks to google research~~

1) Answer is: limiting reagent is hydrochloric acid.

Balanced chemical reaction: Mg + 2HCl → MgCl₂ + H₂.

m(Mg) = 25 g; mass of magnesium.

n(Mg) = m(Mg) ÷ M(Mg).

n(Mg) = 25 g ÷ 24.3 g/mol.

n(Mg) = 1.03 mol; amount of magnesium.

m(HCl) = 20 g; mass of hydrochloric acid.

M(HCl) = 36.46 g/mol; molar mass of hydrochloric acid.

n(HCl) = m(HCl) ÷ M(HCl).

n(HCl) = 20 g ÷ 36.46 g/mol.

n(HCl) = 0.55 mol; amount of hydrochloric acid.

2) From balanced chemical reaction: n(Mg) : n(HCl) = 1 : 2.

For 1.03 moles of magnesium 2.06 moles of hydrochloric acid is needed.

n(Mg) = n(HCl) ÷ 2.

n(Mg) = 0.55 mol ÷2.

n(Mg) = 0.225 mol.

m(Mg) = 0.225 mol · 24.3 g/mol.

m(Mg) = 6.66 g; mass of magnesium that reacts.

Δm(Mg) = 25 g - 6.66 g.

Δm(Mg) = 18.33 g; the excess reagent remains.

1) We know that there are 6.023 X 10^23 number of atoms or molecules or ions in one mole of a substance

In case of Magnesium it will have 6.023 X 10^23 number of atoms in one mole

The molar mass of Mg is 24 g/mol

so the mass of one mole of Mg will be 24g

Now moles of Mg in 35 grams = 35 / 24 = 1.458 moles

so number of atoms in 35g = moles X Na

[Where Na = Avagadro's number = 6.023 X 10^23]

number of atoms of Magnesium in 35g

                  = 1.458 X 6.023 X 10^23 = 8.78  X 10^23 atoms

2) The reaction is

Mg(s)  + 2HCl  ---> MgCl2(aq)  + H2(g)

So here one mole of Mg is reacting with two moles of HCl

The molar mass of Mg is 24 g/mol

so the mass of one mole of Mg will be 24g

The moles of Mg in 25 grams = 25 / 24 = 1.04 moles

similarly, Molar mass of HCl = 36.5 g / mol

So mass of one mole of HCl = 36.5 g

The moles of  HCl in 20g = 20 / 36.5  = 0.548 moles

Here for one mole of Mg we need two moles of HCl so for 1.04 moles of Mg we will need 2.08 moles of HCl

However we are provided with just 0.548 moles of HCl, hence HCl is the limiting reagent.

0.548 moles of HCl will react with 0.548 /2 moles of Mg

the moles of Mg reacted = 0.274 moles

Moles of excess Mg left = 1.04 - 0.274 = 0.766 moles

Mass of Mg left = moles left X molar mass = 0.766 X 24 = 18.38 g

the molecular formula of calcium oxide - CaO

The molar mass of CaO - 40 + 16 = 56 g/mol 

Which means that 1 mol weighs 56 g

Therefore 56 g of CaO is - 1 mol

Then 89.23 g is equivalent to - 1/56 x 89.23 = 1.6 mol of CaO.

Final answer:

To find the number of moles in 89.23 g of calcium oxide, divide the mass by the molar mass of CaO, which is 56.0 g/mol, resulting in approximately 1.5934 moles.

Explanation:

To calculate the number of moles equivalent to 89.23 grams of calcium oxide (CaO), one must use the molar mass of CaO as a conversion factor. The molar mass of CaO, where calcium (Ca) has an atomic mass of 40.0 u and oxygen (O) has an atomic mass of 16.0 u, is 40.0 g/mol + 16.0 g/mol = 56.0 g/mol.

The number of moles of CaO can be determined by dividing the given mass by the molar mass:

Number of moles of CaO = (mass of CaO) / (molar mass of CaO)
= 89.23 g / 56.0 g/mol
= 1.5934 moles

Therefore, 89.23 grams of calcium oxide are equal to approximately 1.5934 moles of CaO.

Final answer:

Water is classified as a compound because it consists of hydrogen and oxygen atoms bonded in a fixed ratio, represented by the chemical formula H2O. Elements contain only one type of atom, and mixtures combine substances without forming new chemical bonds.

Explanation:

Water is a compound, not an element or a mixture. This is because it is composed of hydrogen and oxygen atoms in a fixed ratio. To be more precise, a water molecule consists of two hydrogen atoms bonded to one oxygen atom, which can be represented by the chemical formula H2O. Molecules of elements contain only one type of atom, whereas molecules of compounds, like water, contain two or more types of atoms bonded together in a specific geometric arrangement.

In contrast, a mixture is a combination of two or more substances that maintain their own chemical identities, and they do not bond chemically to form a new compound. For example, air is a mixture of nitrogen, oxygen, argon, and carbon dioxide, among other gases.

Hi There!

Obsidian - Igneous Rock

Marble - Metamorphic Rock

Conglomentary - Sedimentary Rock

Hope This Helps :)

Hey!

-------------------------------------------------

Answer:

Obsidian is an igneous rock.

Conglomentary is a sedimentary rock

Marble is an metamorphic rock.

-------------------------------------------------

Explanation:

Igneous Rock - which is formed through the process of solidification and cooling of magma.

Sedimentary Rock - which is formed through the process of particles being picked up from under bodies of water.

Metamorphic - Which is formed through the process of a rock going through physical or chemical changes.

-------------------------------------------------

Hope This Helped! Good Luck!

Answer:

The correct answer option is 1.6 atm.

Explanation:

We know that there is a sample gas which has a volume of 2.4 L with a pressure 1.2 atm and we are to find the pressure of the same gas sample if its volume is reduced to 1.8 L at a constant temperature.

We will apply the Boyle's law here which states that the "pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature".

[tex]P_1V_1=P_2V_2[/tex]

Substituting the values in the formula to get:

[tex]P_2=\frac{1.2*2.4}{1.8} \\\\P_2=1.6[/tex]

Therefore, the pressure of the same gas sample will be 1.6 atm if the volume is reduced to 1.8 L at a constant temperature.

crystalize - cause to form crystals or assume crystalline form; "crystallize minerals" crystalise, crystallise, crystallize. natural philosophy, physics - the science of matter and energy and their interactions; "his favorite subject was physics"

Answer is: 4. the forward and reverse reaction rates are the same.

The reaction rate is the speed at which reactants are converted into products.

The formation constant can be calculated when chemical equilibrium is reached, when the forward reaction rate is equal to the reverse reaction rate.

In a chemical reaction, chemical equilibrium is the state in which both reactants and products are present in concentrations which have no further tendency to change with time.  

Reaction rates of the forward and backward reactions are equal and there are no changes in the concentrations of the reactants and products.

That would be when the baseball is rising. The energy from the throw is kinetic energy.

In a neutralization reaction, equivalent volumes of solutions with equal normality will neutralize each other. Thus, 53 mL of 0.0050 N KOH will neutralize 53 mL of 0.0050 N H2SO4.

To answer the question 'How many milliliters of 0.0050 N KOH are required to neutralize 53 mL of 0.0050 N H2SO4 ?', we must understand the concept of neutralization in the context of acid-base reactions. Neutralization occurs when an acid reacts with a base to produce water and a salt, with no excess of hydrogen or hydroxide ions left in the solution.

In this case, the reaction is between KOH (Potassium Hydroxide, a base) and H2SO4 (Sulfuric Acid, an acid). As both solutions are of the same normality (0.0050 N), they will neutralize each other in equal volumes. Hence, 53 mL of 0.0050 N KOH are required to neutralize 53 mL of 0.0050 N H2SO4.

This concept ties into titration, a technique where a solution of known concentration (in this case, KOH) is used to determine the concentration of an unknown solution (H2SO4). It's important to note that this is a simplified example as it assumes 1:1 stoichiometry. For other reactions, it might be necessary to take into account the stoichiometric coefficients in the balanced chemical equation.

https://brainly.com/question/32025930

#SPJ3

We have to get the true statement about Dalton's atomic theory.

The true statement is: Dalton’s theory recognized that all matter is composed of atoms.

According to Dalton's atomic theory, all matter is made of atoms and atoms are indivisible and not destructible. So, the statement -Dalton’s theory recognized that all matter is composed of atoms- is true whereas the statement - Dalton’s theory recognized the existence of smaller particles within atoms is false.

As per Dalton's theory, all atoms of a given elements are identical in mass and properties, so the statement -Dalton’s theory did not account for the similarities of atoms of the same element is false.

Also, compounds are formed by a combination of two or more different kinds of atoms hence the statement - Dalton’s theory stated that atoms could not combine with each other is false.

Answer:

evidence that some kinds of matter are made up of waves instead of particles

observations that cannot be explained by the theory

Explanation: these ones are right trust

Answer:

nh3

Explanation:

Answer:

They Both get benefited

Explanation:

Final answer:

In the relationship described, cattle egrets benefit by eating insects disturbed by grazing antelope, making it a commensal relationship where egrets benefit and antelope are typically unaffected. The correct answer to the question is A, with egrets gaining a food source from the activity of the antelope. So the correct option is A.

Explanation:

The relationship between cattle egrets and large grazing animals like rhinoceroses, elephants, antelope, and cows is a wonderful example of commensalism in nature. When large animals graze, they disturb insects in the grass, which the cattle egrets then feed on. This relationship is beneficial to the egrets as they gain a food source, but the large animals are neither harmed nor specifically benefitted by the presence of the egrets. However, sometimes there might be a slight advantage to the large animals if the egrets do remove pests like ticks or fleas, but this isn't the primary interaction.

Considering the relation between the cattle egrets and the antelope in the provided scenario, the most accurate answer would be:

This conclusion is based on the context of the question highlighting the egrets eating insects or small mammals that are disturbed by the grazing antelope.

Answers are in Word document.

Answer:

Explanation:

Bro im an excelletn as this but this was like two years ago

Answer:

Here we need to find the morality of 60 grams of NaOH dissolved in 750ml because the amount of solute is usually taken in ml and 750 litres is way to high.

So, coming towards the question, we need to find molarity.

As we know, molarity is no of moles of a substance per litre of the solution.

                                           Molarity= mole\volume ----> 1

Now we will change 750ml  to litres

                                      750/1000 = 0.75 litres

Now we need to find no of moles of NaOH.

As we know, no of moles = mass /molar mass

                       no of moles =60 grams / 40

                       no of moles= 1.5 moles

Putting the values of no of moles and volume in equation 1

                               Molarity= mole\volume ----> 1

                                             =1.5 moles/ 0.75 litres

                                             =2 M

So the answer will be 2 Molar.

your answer would be 2.0

Answer:

2.7 mol

Explanation:

we have the following reaction

[tex]3 H_2 + N_2\longrightarrow 2 NH_3[/tex]

Data

[tex]2.0 mol H_2\\4.0mol N_2\\mol NH_3= ?[/tex]

First we must calculate what the limit reagent is.

the limit reagent is consumed first, when it is consumed completely the reaction is finished

[tex]3molH_2\longrightarrow 1mol N_2\\4molH_2\longrightarrow x \\x=\frac{4molH_2.1molN_2}{3molH_2}=1.33mol N_2[/tex]

This means that in order to fully consume 4 moles of hydrogen, 1.3 moles of nitrogen are needed, since we have more than this amount of nitrogen (the nitrogen is in excess) is our excess reagent and hydrogen is our limit reagent. so much is it that determines how much product is formed

From the stoichiometric coefficients of the reaction we know that three moles of hydrogen are needed to produce two moles of ammonia

So how many moles of ammonia will be produced if we have 4 moles of hydrogen

To solve it we apply a simple rule of three

[tex]3mol H_2\longrightarrow 2 mol NH_3\\4molH_2\longrightarrow x \\x=\frac{2molNH_3.4molH_2}{3molH_2}=2.7 mol NH_3[/tex]

2.7 mol NH_3 are produced

Answer: (c) a gold brick would have the least amount of inertia.

The inertia of an object refers to its ability to continue in its present state of rest or uniform motion until any external force act of the body to change its state of motion.

The inertia of a body increases with its mass. For this reason, a body with more mass and high inertia needs larger force to change its state of motion or rest. Among the given objects, the mass of a gold brick is the least. For this reason, it would have the least amount of inertia and least amount of force is required to change its state of motion or rest.

Scandium has 21 electrons, which are distributed according to its electronic configuration ([Ar] 3d¹4s²).

The number of electrons in an atom of scandium (Sc) is equal to its atomic number, which is 21. The electronic configuration of scandium is [Ar] 3d¹4s², denoting that there are 2 electrons in the 4s orbital and 1 electron in the 3d orbital, after the argon core.The number of electrons in an atom of scandium (Sc) is equal to its atomic number, which is 21.  Scandium is a transition metal and it is important to know that in its ionic form (Sc³+), it loses the 3 outer electrons and assumes an electronic structure similar to argon.

https://brainly.com/question/42032919

#SPJ2

molar mass of methane CH4

= C + 4 H  

= 12.0 + 4 x 1.008

= 12.0 +  4.032

= 16.042g/mol

7.31 x 10^25 molecules x             1 mole  CH4      = 121.43 moles

                                       6.02 x 10^23 CH4 molecules

121.43 moles CH4 are present.

Answer : The number of moles of methane are, 121.39 moles

Explanation : Given,

Number of molecules of methane gas = [tex]7.31\times 10^{25}[/tex]

Now we have to calculate the number of moles of methane gas.

As, [tex]6.022\times 10^{23}[/tex] number of molecules of methane present in 1 mole of methane gas.

So, [tex]7.31\times 10^{25}[/tex] number of molecules of methane present in [tex]\frac{7.31\times 10^{25}}{6.022\times 10^{23}}\times 1mole=121.39[/tex] moles of methane gas.

Therefore, the number of moles of methane are, 121.39 moles

the red wine is the densest so, it will be on bottom olive oil will be on the top. because its less than the red wine

Fossil fuels are still being widely used because of the fact that the demand for alternative fuels cannot be met by current manufacturers.

Answer:

cost-effective alternatives are not yet ready to replace fossil fuels; they are the cheapest resource, especially oil.

M= Moles/ L

2.50=x/0.0150

x=0.0375 moles

moles x mm= grams

0.0375 x 247.8= 9.2925 grams

the answer is                                                                                                            

C. 9.30 g

The chemical reaction is the process in which one or more reactants are converted into one or more than one product. The statement about chemical reactions is not true is new atoms are formed as products.

In a chemical reaction, one or more materials known as reactants are changed into one or more additional substances also known as products. Chemical elements or chemical compounds make up substances.

When one or more chemicals are transformed into one or more other compounds, a chemical reaction takes place. Example: the formation of rust when iron and oxygen combine. Sodium acetate, carbon dioxide, and water are produced when vinegar and baking soda are combined.

As long as the mass of the reactants before the reaction is equal to the mass of the products after the reaction, mass is conserved in chemical reactions even when new products are formed.

Thus, Option D is correct.

To learn more about chemical reaction follow the link below;

https://brainly.com/question/3461108

#SPJ3

The correct student would be student D since an ionic bond is made up of a metal and nonmetal where metals usually give electrons and nonmetals take.

Answer is: Student D: Assets of a small company being taken over by a large company.

Ionic bond is the electrostatic attraction between oppositely charged ions (cations and anions).

For example, compound magnesium chloride (MgCl₂) has ionic bond.

In this example, chlorine is large company, because it has greater electronegativity than magnesium (small company) and take electrons (assets) from it.

Magnesium (Mg) transfers two electrons, became positive cation, to chlorine (Cl), which became negative anion.  

Magnesium is metal from group 2 and chlorine is nonmetal from group 17 of the Periodic table.

Electronegativity (χ) is a property that describes the tendency of an atom to attract a shared pair of electrons.

I would have to say A. FeCl2•4H2O

I hope this helps!

Cheers, July. :)

The amount of electrons transferred depends on how many electrons an element gains/loses. Metals normally lose electrons and nonmetals gain electrons to attain a total of 8 electrons.

A.) R represents chemical energy, P represents thermal energy

explanation: Gas is chemical. So when you turn on the gas stove the chemical   comes out and then ignite and then after that fire appears and that is a thermal energy

Answer:

A.

Explanation:

Because gas is a chemical and it gets transferred into thermal because of a small flint making fire which is heat or thermal energy.