Is everything correct?

Answer: a

Explanation:

Answer:

4 mol Fe

5 mol FeCl₃

Explanation:

Step 1: Write the balanced equation

2 Fe + 3 Cl₂ ⇒ 2 FeCl₃

Step 2: Calculate how much iron (Fe) is needed to produce 4 moles of FeCl₃

According to the balanced equation, the molar ratio of Fe to FeCl₃ is 2:2.

4 mol FeCl₃ × 2 mol Fe/2 mol FeCl₃ = 4 mol Fe

Step 3: Calculate how much FeCl₃ is produced when 5 moles of Fe react in excess chlorine

According to the balanced equation, the molar ratio of Fe to FeCl₃ is 2:2.

5 mol Fe × 2 mol FeCl₃/2 mol Fe = 5 mol FeCl₃

Answer:

d. 3.0

Explanation:

First we calculate the pOH of the solution, using the following formula:

Using the pOH we can calculate the pH of the solution, keeping in mind the relationship between pH and pOH:

The answer is option d.

Answer:Reactants are starting materials and are written on the left-hand side of the equation. Products are the end-result of the reaction and are written on the right-hand side of the equation.

Explanation:

The reactants in a balanced chemical reaction are the starting material which reacts together to give the products in by the regrouping of atoms in the reactants.

The balanced chemical equation of a reaction represents the perfect stoichiometry of each reactants and products with their states of matter in brackets.

In a balanced reaction, the number of each element in the reactant side must be equal to their number in the product side. The number of each elements and groups in a reaction can be balanced by multiplying with suitable integers.

The atoms in the reactants are regrouping to form the products. Thus, the identity of  the new products is entirely different form that of reactants in the reaction.

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Answer:

Explanation:

The first two are easy:

H2O, H3O+ and OH- all exist in an equilibrium

[H3O+] = [OH-] = 10^-7 M

HCl is a strong acid so 1M of it will disassociate completely

[H3O+] = [Cl-] = 1 M

The third one is also an equilibrium as HNO2 is a weak acid. Ka is given so [HNO2] and [NO2-] can be calculated.

The fourth one is a buffer solution so its pH can be looked up to give the concentrations.

Answer:

Explanation:

H20 has pH of 7

1st reaction [H30+] = 10^-7M

[OH-] = 10^-7M

1M HCl has pH of 0

2nd reaction [H3O+] = 1M

[Cl-] = 1M

given Ka = 4.6x10^-3 = [H3O+]x[NO2-] / [HNO2]

and [HNO2] + [NO2-] = 1M

each concentration can be solved

beaker D is a buffer solution n requires more info 2 solve

Answer:

Lithium Cation is a monovalent cation that is metabolized much like sodium and is important in many cellular functions inside or on the surface of cells. lithium has a single valence electron that is easily given up to form a cation. Because of this, lithium is a good conductor of heat and electricity as well as a highly reactive element, though it is the least reactive of the alkali metals

Answer:

No

Explanation:

If tin is heated, it can react with alkalis' with the release of hydrogen.

Tin is a great metal that is used for packaging purposes.

However, if the tin in the tin can is replaced with alkali metals then they will readily react with the acid present in the food materials stored inside, thereby rendering the food unsafe.

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Answer:

.........................................................................................................................................................................................................................................................................................................................................................................................................................................................

Explanation:

If 36g of Al react with 34L of Oz, 0.667 moles of Al2O3 are produced. The correct option is b, 0.667 moles

The mole is a SI unit of measurement that is used to calculate the quantity of any substance.

[tex]\rm 4Al +3O_2 -- > 2Al_2O_3[/tex]

Step1- calculate the moles of aluminum

The mass of Al is 36 g

The molar mass of Al is 27

[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\rm Number\;of \;moles\;of\;Al = \dfrac{36}{27} = 1.33\;mol[/tex]

Step2- calculate the moles of oxygen

The mass of O₂ is 34 L

[tex]\rm 1 L = \dfrac{1}{22.4 }[/tex]

[tex]\rm Number\;of \;moles\;O_2= \dfrac{34}{22.4} = 1.51[/tex]

The limiting reagent is 1.33 MOL. By the rule of stoichiometry, four moles of Al produced 2 moles of Al.

[tex]\rm \dfrac{1.33}{2} = 0.665 \;moles[/tex]

Thus, the correct option is b. 0.667 moles.

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Answer:

0.74

Explanation:

this is the correct answer. I followed a correct answer that had the same probelm with different values, swithxed it with mine, and got 0.75. So its basically 0.74

Answer:

Zinc is an element.

Explanation:

Compounds are composed of two or more elements

Answer:

element

Explanation:

zinc is an element with atomic number 30

From what I know personally from learning about this type of subject in the past is that children are more susceptible to the effects of toxic substances more than adults are, certain scientific data specifically indicate that children actually are for all intents and purposes more basically susceptible to toxic exposure than adults because they for the most part have proportionally definitely more intake of food contaminants, basically active developmental processes, basically multiple exposure pathways and really susceptible kind of socio-behavioral activities in a particularly major way.

Answer:

8 meters per second per second

Explanation:

Newton's second law: [tex]f=ma[/tex], force = mass multiplied by acceleration.

Therefore 56 / 7 = acceleration = 8

Answer:

C2H5NO2

Explanation:

Glycine | C2H5NO2 - PubChem.

weight of glycine= 75.07 g/mol

Answer: A 13.88 mL of the concentrated acid would be required to make 250. mL of a 1.00 M [tex]H_{2}SO_{4}[/tex] solution.

Explanation:

Given: [tex]M_{1}[/tex] = 18.0 M,     [tex]V_{1}[/tex] = ?

[tex]M_{2}[/tex] = 1.00 M,         [tex]V_{2}[/tex] = 250 mL

Formula used to calculate the volume of concentrated acid is as follows.

[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]

Substitute the values into above formula as follows.

[tex]M_{1}V_{1} = M_{2}V_{2}\\18.0 M \times V_{1} = 1.00 M \times 250 mL\\V_{1} = \frac{1.00 M \times 250 mL}{18.0 M}\\= 13.88 mL[/tex]

Thus, we can conclude that 13.88 mL of the concentrated acid would be required to make 250. mL of a 1.00 M [tex]H_{2}SO_{4}[/tex] solution.

Answer:

Nebulae are made of dust and gases—mostly hydrogen and helium. ... Eventually, the clump of dust and gas gets so big that it collapses from its own gravity. The collapse causes the material at the center of the cloud to heat up-and this hot core is the beginning of a star.

Explanation:

Hope this helps

Answer:

0.333J/g°C is the specific heat of the metal

Explanation:

The heat that the metaal gives is equal to the heat that water is absorbing. The equation is:

S(metal)*ΔT(metal)*Mass(metal) = S(H2O)*ΔT(H2O)*Mass(H2O)

Where S is specific heat, ΔT is change in temperature and mass the mass in grams of the metal and water.

Replacing:

S(metal)*(100.0°C-27.2°C)*125.0g = 4.184J/g°C*(27.2°C-24.3°C)*250.0g

S(metal) = 4.184J/g°C*(27.2°C-24.3°C)*250.0g / (100.0°C-27.2°C)*125.0g

S(metal) = 0.333J/g°C is the specific heat of the metal

Answer:

Neutrons and protons

Explanation:

There are three fundamental subatomic particles, these are;neutrons protons and electrons.

Ernest Rutherford successfully showed that every atom does possess a central core that contain positively charged particles (protons) called the nucleus. Chadwick later discovered the existence of neutrons.

Both protons and neutrons are found in the nucleus. Z represents the nucleus of the boron atom and houses the neutrons and protons of the boron atom.

Answer:

Explanation:

Given 5.50 grams of AgNO₃, how many formula units of AgNO₃ are contained in the 5.50 grams of AgNO₃? (formula wt. of AgNO₃ = 169,87 g/mole).

Solution:

The number of molecules of silver nitrate in 5.5 grams has been [tex]1.93\;\times\;10^2^2[/tex]. Thus, option A is correct.

The formula unit has been given as the number of molecules of the compound. The number of molecules in a mole of compound has been given by the Avogadro law.

According to the Avogadro law,  the number of molecules in a mole of sample has been equivalent to the Avogadro number, i.e. [tex]6.023\;\times\;10^2^3[/tex].

The given mass of silver nitrate has been 5.50 grams.

The molar mass of silver nitrate has been 169.84 g/mol.

The moles of silver nitrate has been:

[tex]\rm Moles=\dfrac{Mass}{Molar\;mass} \\\\ Moles=\dfrac{5.5}{169.84}\;mol\\\\ Moles=0.032\;mol[/tex]

The moles of silver nitrate in the sample has been 0.032 mol.

The number of molecules of silver nitrate has been:

[tex]\rm 1\;mole=6.023\;\times\;10^2^3\;molecules\\ 0.032\;mol=0.032\;\times\;6.023\;\times\;10^2^3\;molecules\\ 0.032\;mol=1.93\;\times\;10^2^2\;molecules[/tex]

The number of molecules of silver nitrate in 5.5 grams has been [tex]1.93\;\times\;10^2^2[/tex]. Thus, option A is correct.

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Answer: The statement collisions only result in a reaction if the particles collide with a certain maximum energy called the activation energy of the reaction, is false.

Explanation:

Activation energy is the minimum amount of energy required to initiate a chemical reaction.

So, when activation energy for a reaction is lower then molecules with lower energy can also participate in the reaction. As a result, more number of collisions will take place due to which an increase in the rate of reaction will takes place.

When activation energy for a reaction is larger then molecules with higher energy will not be able to participate in the reaction. As a result, less number of collisions will take place due to which a decrease in rate of reaction will occur.

Therefore, we can conclude that the statement collisions only result in a reaction if the particles collide with a certain maximum energy called the activation energy of the reaction, is false.

Answer:

true

Explanation:

particularly must collide with energy equal to or greater the

P1: 741 mmHg

V1: 3.49 L P1 x V1 / P2= (741 mmHg) (3.49 L) / 760 mmHg = 3.40 L

P2: 760 mmHg

V2: ? L

Answer:

microwaves should be made

Answer:

answer choices plzzzzz

ima edit my answer wht are the choices

Explanation:

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Answer:

The solubility of a saturated solution can be increased by increasing the temperature.

Explanation:

Temperature -- Generally, an increase in the temperature of the solution increases the solubility of a solid solute. For example, a greater amount of sugar will dissolve in warm water than in cold water. A few solid solutes, however, are less soluble in warmer solutions.

Answer:

the property of air shown in the figure describe A.mass

Answer:

Chemical reactions and physical transformations do not create or destroy mass in an isolated system, according to the law of conservation of mass. The mass of the products in a chemical reaction must equal the mass of the reactants, according to the conservation of mass law. The law of conservation of mass can be used to solve for unknown masses, such as how much gas is consumed or produced during a reaction.

Answer:

160 mL

Explanation:

Answer:

1.They are reliable.

2.They dont vary from person to person

Answer:  Mass is 2,37 kg

Explanation: Weight G = mg, and g = 9.81 m/s² on Earth.

m = W/g = 23.2 N /  9.81 m/s²