the last 10,000 years is called the group of answer choices cenozoic. solutrean. holocene. quaternary.

Explanation:

the empirical formula is correct but I didn't got the question properly

Answer:

9.8 × 10²⁴ molecules H₂O

General Formulas and Concepts:

Atomic Structure

Organic

Stoichiometry

Explanation:

Step 1: Define

[RxN - Unbalanced] CH₄ + O₂ → CO₂ + H₂O

[RxN - Balanced] CH₄ + 2O₂ → CO₂ + 2H₂O

[Given] 130 g CH₄

Step 2: Identify Conversions

Avogadro's Number

[RxN] 1 mol CH₄ → 2 mol H₂O

[PT] Molar Mass of C: 12.01 g/mol

[PT] Molar Mass of H: 1.01 g/mol

Molar Mass of CH₄: 12.01 + 4(1.01) = 16.05 g/mol

Step 3: Stoichiometry

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

9.75526 × 10²⁴ molecules H₂O ≈ 9.8 × 10²⁴ molecules H₂O

The Mass of gas released is 1.06g

The mass of a gas is the total amount of matter that is present in a particular sample of gas. This includes the mass of any particles suspended in the gas, such as dust or particles of a particular element, as well as the mass of the gas itself. The mass of a gas is determined by measuring the density of the gas, and then multiplying it by the volume of the sample.

The mass of gas released can be calculated as follows:

Mass of dry tablet before reaction is 2.92g

Mass of gas released = Mass of dry tablet before reaction - Mass of tablet after reaction

Mass of gas released = 3.98g - 2.92g = 1.06g

Therefore,The Mass of gas released is 1.06g

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Answer:

joule

Explanation:

Th e Ksp for the equilibrium of zinc phosphate is approximately 1.9225×10^−30.

The solubility product constant (Ksp) is the equilibrium constant for the dissolution of a sparingly soluble salt. In this case, the equilibrium is:

Zn3(PO4)2(s) ⇌ 3Zn2+(aq) + 2PO3-4(aq)

The Ksp expression for this equilibrium is:

Ksp = [Zn2+]^3 [PO3-4]^2

Given that the molar solubility of zinc phosphate (Zn3(PO4)2) is 1.5×10^−7 M, we can substitute this value into the Ksp expression:

1.5×10^−7 = [Zn2+]^3 [PO3-4]^2

Since the stoichiometric coefficients for zinc ions (Zn2+) and phosphate ions (PO3-4) in the balanced equation are 3 and 2, respectively, we can express their concentrations in terms of the molar solubility:

[Zn2+] = 3 × (1.5×10^−7) = 4.5×10^−7 M

[PO3-4] = 2 × (1.5×10^−7) = 3.0×10^−7 M

Substituting these values into the Ksp expression, we get:

Ksp = (4.5×10^−7)^3 × (3.0×10^−7)^2

Evaluating this expression gives:

Ksp = 1.9225×10^−30

Therefore, the Ksp for the equilibrium of zinc phosphate is approximately 1.9225×10^−30.

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Answer: ksp= 8.2 X 10^-33

Answer:

2Na + Cl2 -------> 2 NaCl ... only add at sodium and

product 2 coficient

N2 + 3H2 --------> 2NH3 ...... only add at Hydrogen molecule and it's product 2 and 3 respectively.

The equations can be balanced as -

2Na + Cl₂ = 2 NaCl

2N₂ + 3H₂ = 2 NH₃

A balanced chemical equation is an equation where the number of atoms of each type in the reaction is the same on both reactants and product sides.

An unbalaced chemical equation is not an accurate representation of a chemical equation and thus requires balancing.

The law of conservation of mass is the governing law for balancing a chemical equation.

The law states that ‘mass can neither be created nor be destroyed in a chemical reaction’

Hence, the total mass of substances before the reaction should be equal to the mass after the reaction is complete.

Therefore, The equations can be balanced as -

2Na + Cl₂ = 2 NaCl

2N₂ + 3H₂ = 2 NH₃

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Answer:

29.04

Explanation:

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option A.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.

Composite materials are made from Concrete and steel. A composite material is made up of two or more constituent materials whose properties are very dissimilar from each other.

Therefore, the correct option is option A.

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Answer:

kmno4 is heated => k2mno4 + mno2 + o2

Hope this helps!

:)

The buffer capacity of this solution is 0.34.

Buffer solution is defined as a solution whose pH is not altered to any great extent by the addition of small quantities of either an acid or base is called buffer solution. Buffer is also known as the solution of reserve acidity or alkalinity which resists change of pH upon the addition of a small amount of acid or alkali.

Buffer capacity is number of moles of acid or base added to 1 lit buffer to bring 1 unit change in pH.

buffer capacity = (0.25x0.5) / (8.05-7.68) = 0.34

Hence, the buffer capacity of this solution is 0.34.

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Answer:

alkaline earth metals

Explanation:

Answer:

Group 2

Explanation:

Strontium (Sr), chemical element, one of the alkaline-earth metals of Group 2 (IIa) of the periodic table.

Hope this helps

Answer:

Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together. After the salt compounds are pulled apart, the sodium and chloride atoms are surrounded by water molecules, as this diagram shows. Once this happens, the salt is dissolved, resulting in a homogeneous solution.

Explanation:

Part of the investigation must be measuring the pressure inside the lighter fuel tank.

The pressure of gas measures how compact the gas molecules are. We know that the more compacted the gas molecules are, the more likely the gas will exist in the liquid state.

Hence, part of the investigation must be measuring the pressure inside the lighter  fuel tank.

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Answer: You should learn the symbols for the eight most abundant elements in the Earth's crust (Oxygen (O), Silicon (Si), Aluminum (Al), Calcium (Ca), Iron (Fe), Magnesium (Mg), Sodium (Na), and Potassium (K) .

Explanation:

The value of the equilibrium constant (Kc) is a measure of the ratio of product concentration to reactant concentration at equilibrium for a particular chemical reaction.

If the value of Kc is greater than 1, then the concentration of products is greater than the concentration of reactants at equilibrium, indicating that the forward reaction is favored.

Conversely, if the value of Kc is less than 1, then the concentration of reactants is greater than the concentration of products at equilibrium, indicating that the reverse reaction is favored. If the value of Kc is equal to 1, then the concentration of products and reactants are equal at equilibrium, indicating that the reaction proceeds in both directions equally.

Therefore, the value of the equilibrium constant predicts the direction of the chemical reaction based on the concentration of products and reactants at equilibrium.

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The atomic number of an isotope of tellurium that has 71 neutrons is 52.

The atomic number of an element is the number of protons in an atom of that element.

The number of protons in an atom can be got by subtracting the mass number of an element from the number of neutrons.

According to this question, one isotope of tellurium, tellurium-123, has 71 neutrons. The atomic number or proton number can be calculated thus;

atomic number = 123 - 71

atomic number = 52

Therefore, the atomic number of an isotope of tellurium that has 71 neutrons is 52.

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Answer:

Explanation:l do not no the answer

Answer:

0.116 moles of ammonia can be produced from the reaction of 4.0 liters of hydrogen at 50.0°C and 1.2atm of pressure with excess nitrogen.

Explanation:

The balanced chemical equation for the reaction of hydrogen and nitrogen to form ammonia is:

N2(g) + 3H2(g) → 2NH3(g)

To determine how many moles of ammonia can be produced from the reaction of 4.0 liters of hydrogen at 50.0°C and 1.2atm of pressure with excess nitrogen, we need to use the ideal gas law equation:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

First, we need to convert the volume of hydrogen gas to moles using the ideal gas law equation:

n = PV/RT

where P is the pressure in atm, V is the volume in liters, R is the gas constant (0.0821 L·atm/mol·K), and T is the temperature in Kelvin.

n = (1.2 atm)(4.0 L)/(0.0821 L·atm/mol·K)(50.0°C + 273) = 0.174 mol H2

Since there is excess nitrogen, all of the hydrogen will react to form ammonia. Using the mole ratio between NH3 and H2 from the balanced chemical equation:

2 mol NH3 / 3 mol H2

we can calculate how many moles of NH3 will be produced:

n(NH3) = (0.174 mol H2) × (2 mol NH3 / 3 mol H2) = 0.116 mol NH3

Therefore, 0.116 moles of ammonia can be produced from the reaction of 4.0 liters of hydrogen at 50.0°C and 1.2atm of pressure with excess nitrogen.

Answer

To convert μg/l to mol/kg?

Step 1: from the mass in grams, find the number of moles by diving the mass by its molar mass

Step 2: To go from L to kg, take the volume given multiply it by density in kg/L

Answer:

nCaCO3 = 20/100 = 0,2 mol

CaCO3 --> CaO + CO2

0,2 ----------------> 0,2

nNaOH = 0,5.0,56 = 0,28 mol

=> T = nNaOH/nCO2 = 0,28/0,2 = 1,4

=> sản phẩm tạo ra bao gồm : Na2CO3 và NaHCO3

NaOH + CO2 --> NaHCO3

x -------> x --------> x

2NaOH + CO2 --> Na2CO3 + H2O

y ---------> 1/2y ---> 1/2y

ta có : nCO2 = nMuối = 0,2 mol

=> CmMuối = 0,2/0,5 = 0,4 M

0.30moles is the moles of H\(_3\)PO\(_4\). a mole, sometimes spelt mol, is a common scientific measurement unit.

In chemistry, a mole, sometimes spelt mol, is a common scientific measurement unit for significant amounts of extremely small objects like atoms, molecules, or even other predetermined particles. The mole signifies  6.022×10²³  units, which is a very big quantity.

Under the International System of Units (SI), the mole is defined as this quantity as of May 20, 2019, according the General Conference upon Weights and Measurements. The amount of atoms discovered via experimentation to be present within 12 grams pure carbon-12 was originally used to define the mole.

mole = given mass/ molar mass

        = 30.00/97.9

        =0.30moles

Therefore, 0.30moles is the moles of H\(_3\)PO\(_4\).

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Answer:The amount of energy used or released as heat in a reaction.

Explanation:

Iron-55 (55Fe) is a radioactive isotope of iron with a nucleus containing 26 protons and 29 neutrons.

Answer:

54

Explanation:

yep

The theoretical yield of the water in the reaction is 329.4 g.

We know that we can be able to obtain the theoretical yield when we look at the stoichiometry of the reaction that we have here. In this case, it is clear that would need to rely on the reaction equation and it would be our guide.

We have that;

2 moles of hydrogen would produce 2 moles of water

18.3 moles of hydrogen would also produce 18.2 moles of water.

Theoretical yield of water would now be;

18.3 * 18 g/mol

= 329.4 g

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Size of an atom increases as we move down a group and from left to right across a period

Define an atom?

An atom is a unit of matter that specifically characterizes a chemical element. One or more negatively charged electrons surround the core nucleus of an atom, which is made up of all of them. One or more protons and neutrons, which are comparatively heavy particles, can be found in the positively charged nucleus.

In a group, as the atomic number rises, the atomic size expands from top to bottom. Valence electrons are located farther from the nucleus because there are more filled energy levels, which increases atomic size.

Atomic size grows as a function of period number, number of shells, and so forth. Since there are more electrons in each shell as we move from left to right in a period, the force of attraction between the nucleus and electrons, which have positive charges, is stronger, bringing the shells closer to the nucleus and shrinking the size of the atom.

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Answer:

When cells become damaged or die the body makes new cells to replace them. This process is called cell division. One cell doubles by dividing into two. Two cells become four and so on.

Explanation:

The correct answer is To determine how many grams of hydrobromic acid (HBr) are produced when excess nitric acid\((HNO3)\)reacts with 25.4 g of lithium bromide\((LiBr)\), we need to use stoichiometry and the balanced chemical equation provided.

The balanced chemical equation is \(HNO3(aq) + LiBr(aq) → LiNO3(aq) + HBr(aq)\)From the equation, we can see that one mole of HNO3 reacts with one mole of LiBr to produce one mole of HBr. Therefore, we need to first determine the number of moles of LiBr used in the reaction. To do this, we can use the molar mass of LiBr to convert the given mass of 25.4 g to moles: \(25.4 g LiBr x (1 mole LiBr / 86.85 g LiBr) = 0.292 moles LiBr\)Since the reaction uses 1 mole of LiBr, we know that 0.292 moles of HBr will be produced. To determine the mass of HBr produced, we can use the molar mass of HBr: \(0.292 moles HBr x (80.91 g HBr / 1 mole HBr) = 23.6 g HBr\) Therefore, when excess nitric acid reacts with 25.4 g of lithium bromide, 23.6 g of hydrobromic acid are produced. It's important to note that the word "excess" indicates that there is more than enough nitric acid to react with all of the lithium bromide, which means that the reaction will go to completion and all of the LiBr will be consumed. If the nitric acid were limiting, then we would need to calculate the amount of HBr produced based on the limiting reactant.

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Answer:

B

Explanation:

Both plain and plateau have flat surfaces. However, a plain is located in a low-lying area while a plateau is located on an elevated area. In essence, a plateau can be viewed as an elevated plain or a plain that is bordered by cliffs.

The correct option is B.

Answer:i don’t know

Explanation:i don’t know