PLEASE ANSWER 80 POINTS
Which response includes all of the following Z1) LiO2 + CO2 → Li2CO3 Z2) Cl2 + 2 NaBr → Br2 + 2 NaCl Z3) HNO3 + KOH → KNO3 + H2O Z4) SO3 + H2O → H2SO4 that are combination reactions, and none that are not combination reactions? 1. Z1 and Z4 only 2. Another reaction or another combination 3. Z1, Z3 and Z4 only 4. Z1 and Z2 only 5. Z1, Z2 and Z4 only

The ratio of H₂ to O₂ is 2:1 and O₂ to H₂O is 1:2. With 20 moles of H₂, you can make 20 moles of H₂O. With 20 moles of O₂, you can make 2 * 20 = 40 moles of H₂O.

a. The H₂ to O₂ mole ratio can be determined by comparing the coefficients of the balanced equation. In this case, the coefficient of H₂is 2, and the coefficient of O₂ is 1. Therefore, the H₂to O₂ mole ratio is 2:1.

b. If you have 20 moles of H₂ and plenty of O₂, you can use the mole ratio from the balanced equation to calculate the moles of H₂O produced.

The mole ratio of H₂ to H₂O is 2:2 (since the coefficient of H₂O is 2).

Therefore, for every 2 moles of H₂, you will produce 2 moles of H₂O. With 20 moles of H₂, you can make 20 moles of H₂O.

c. If you have 20 moles of O₂ and enough H₂, you can again use the mole ratio from the balanced equation to determine the moles of H₂O produced.

The mole ratio of O₂ to H₂O is 1:2 (since the coefficient of O₂ is 1 and the coefficient of H₂O is 2).

Therefore, for every 1 mole of O₂, you will produce 2 moles ofH₂O. With 20 moles of O₂, you can make 2 × 20 = 40 moles of H₂O.

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Answer:

one that reduces a bean plant's ability to make food

one that increases the plants susceptibility to disease

Explanation:

Genetic mutation refers to the changes in the arrangement of the bases that make up a gene. This sudden change may have positive or negative consequences for the individual specie.

Some genetic mutations actually alter a gene's sequence of bases but do not alter the function of the particular protein that the gene in question makes.

The two options chosen in the answer shows situations in which a genetic mutation causes harm to the organism involved.

Answer:

2, 4, and 5

Explanation:

Answer:

alcohol

Explanation:

Answer:

Electrons

hope it helps

Answer:8

842.46 or to the next whole number

Explanation:

just multiply the mass of iron with the volume mL you have.

The mass of the iron whose volume and density are 111 ml and 7.847 g/cm³ respectively is 871.01 grams.

The product of density and volume of a substance represents its mass. Mathematically -

M = V x ρ

where -

ρ - density

M - mass

V - volume

Given is iron in liquid form. It occupies a total volume of 111 ml.

The mass of liquid iron can be calculated using -

M = V x ρ

Volume of iron [V] = 111 ml = 111 cm³.

Density of iron [ρ] = 7.847 g/cm³

Therefore, we can write -

M = 7.847 x 111

M = 871.01 grams

Therefore, the mass of the iron whose volume and density are 111 ml and 7.847 g/cm³ respectively is 871.01 grams.

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Expressing this answer in scientific notation, the amount of N2 produced according to the engineer's design would be approximately 1.467 x 10^1 mol.

To determine the amount of N2 produced in the reaction between dinitrogen tetroxide (N2O4) and excess hydrazine (N2H4), we need to consider the stoichiometry of the reaction.

The balanced equation for the reaction is:

N2H4 + N2O4 → N2 + 2H2O

According to the stoichiometry of the reaction, for every one mole of N2H4, one mole of N2 is produced. The molar mass of N2H4 is approximately 32.05 g/mol.

Given that the rocket is designed to hold 1.35 kg (1350 g) of N2O4, we can calculate the moles of N2H4 required:

Moles of N2H4 = Mass of N2O4 / Molar mass of N2O4

Moles of N2H4 = 1350 g / 92.01 g/mol ≈ 14.67 mol

Since the stoichiometry is 1:1, the amount of N2 produced will be equal to the moles of N2H4:

Moles of N2 produced = Moles of N2H4 ≈ 14.67 mol

Expressing this answer in scientific notation, the amount of N2 produced according to the engineer's design would be approximately 1.467 x 10^1 mol.

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Answer:

1800 g Zr(NO₃)₄

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

5.3 mol Zr(NO₃)₄

Step 2: Identify Conversions

Molar Mass of Zr - 91.22 g/mol

Molar Mass of N - 14.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of Zr(NO₃)₄ - 91.22 + 4(14.01) + 12(16.00) = 338.26 g/mol

Step 3: Convert

\(5.3 \ mol \ Zr(NO_3)_4(\frac{339.26 \ g\ Zr(NO_3)_4}{1 \ mol \ Zr(NO_3)_4} )\) = 1798.08 g Zr(NO₃)₄

Step 4: Check

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

1798.08 g Zr(NO₃)₄ ≈ 1800 g Zr(NO₃)₄

The fact that coal releases more heat than charcoal means that the chemical potential energy is lower in charcoal than in coal.

When the substance is burnt in oxygen, the chemical potential energy stored in the substance is converted into heat energy. The substance that has the most chemical potential energy releases the most energy when burnt.

In burning coal and charcoal, you notice that coal releases more heat energy than charcoal. This means that the chemical potential energy is lower in charcoal than in coal.

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The AZX symbol of  a cation with 13 neutrons is A = 24 , Z = 11 and X = Na+

AZX is a symbol which stands for;

Note, cations are positively-charged ions having more protons than electrons due to loss of one or more electrons.

Sodium ion represented as Na+ is a cation which lost one electron. It has 13 neutrons and 11 protons.

But the mass number of an element, A is the sum of protons and neutrons of the element.

Thus, for Na+

A = 13 + 11 = 24

Z = 11

X = Na+

Therefore, the AZX symbol of  a cation with 13 neutrons is A = 24 , Z = 11 and X = Na+

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Beans are processed through 'nibbing'. During the nibbing process, the roasted cocoa beans are crushed and ground into a paste called cocoa mass or cocoa liquor.

This cocoa mass can then be further processed to separate the cocoa solids from the cocoa butter, which is the fat component of the cocoa bean. The separated cocoa solids and cocoa butter are used in the production of chocolate. Pure cocoa mass (cocoa paste) in solid or semi-solid form is known as chocolate liquor. It includes about equal amounts of cocoa butter and solid cocoa, much like the cocoa beans (nibs) from which it is made. It is made from fermented, dried, roasted, and separated from their skins cocoa beans. To make cocoa mass (cocoa paste), the beans are pulverised.

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A certain ore is 27.9'.9% nickel by mass.  - 28544692. kilograms of this ore would you need to dig up to have 85.0 g85.0 g of nickel.

Chemical element nickel has the symbol Ni and atomic number 28. It is a beautiful silvery-white metal with a faint golden hue. The transition metal nickel is hard and ductile. Although bigger particles of pure nickel are slow to react with air under typical conditions because an oxide layer builds on the surface and limits further corrosion, pure nickel that has been powdered to increase reactive surface area exhibits high chemical activity (passivation).

Yet pure native nickel is only occasionally found in the crust of the Earth, typically in ultramafic rocks and the interiors of bigger nickel-iron meteorites that were not exposed to oxygen during their time outside the Earth's atmosphere.

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As a result, we would anticipate 487.49 grams of Calcium sulfate to result from a reaction between 200 grams of Iron and Calcium sulfate.

Number-wise, the mass of one mole (or formula unit) in atomic mass units is equal to the mass of one mole (or formula unit) in grams. One mole of Oxygen molecules, for instance, weighs 32.00 g and a single Oxygen molecule, 32.00 u.

We can use the following chemical equation, assuming you meant to inquire about the interaction between Iron and Calcium sulfate:

Iron + Calcium sulfate → Ferrous sulfate + Calcium

These numbers can be used to determine how many moles of iron there are in 200 grams:

200 g Iron × (1 mol Iron / 55.85 g Iron) = 3.58 mol Iron

We can infer that 3.58 moles of Calcium sulfate would be formed in this reaction because the stoichiometric ratio of Iron to Calcium sulfate is 1:1.

We can use the following equation to determine the mass of Calcium sulfate generated:

Mass of Calcium sulfate= number of moles of Calcium sulfate× molar mass of Calcium sulfate

Mass of Calcium sulfate = 3.58 mol Calcium sulfate × 136.14 g/mol

Mass of Calcium sulfate = 487.49 g

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False.

It won’t become one if it’s not proven true.

In acetylene, each carbon atom shares one pair of electrons with one hydrogen atom and three pairs of electrons with the other carbon atom.

A carbon atom has four electrons in its outermost shell and needs four electrons to be stable. In acetylene, two carbon atoms are covalently bonded with three electron pairs and the remaining one electron pair is covalently bonded with two hydrogen atoms.

Thus, both carbon and hydrogen atoms gain stability, so in acetylene each carbon atom shares one pair of electrons with a hydrogen atom and shares three pairs of electrons with another carbon atom.

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Among the following options, the disadvantage of marble is that it erodes due to pollution. The correct option is 2.

Marble is a kind of rock that is soft and easy to carve when freshly quarried, but hardens as it ages. Marble is a naturally occurring rock that is made up of the mineral calcite. Marble is utilized as a decorative material in architecture and sculpture because of its ability to be polished to a high shine.

Most marbles can be categorized as either calcite or dolomite. The term "marble" is often used in the industry to refer to any polished natural stone, but this is a misnomer. Only true marble, which is a metamorphic rock, can be polished in this manner.

The advantages of marble are as follows:

The disadvantages of marble are as follows:

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1062.3 KJ heat is absorbed or released in the reaction of 20.0 g of nh3 with sufficient oxygen to produce no (g) and h2o (l).

The heat absorbed or released in the reaction of 20.0 g of NH3 with oxygen to produce NO and H2O depends on the specific conditions of the reaction and the enthalpy change associated with the reaction.

The general equation for the reaction of NH3 with oxygen to produce NO and H2O is:

4NH3 + 5O2 -> 4NO + 6H2O

The enthalpy change for this reaction, which is the heat absorbed or released during the reaction, can be calculated using the enthalpy changes of formation of the reactants and products. The enthalpy change of formation is the heat absorbed or released when a substance is formed from its elements in their standard states.

The enthalpy change of formation of NH3 is -46.2 kJ/mol, the enthalpy change of formation of O2 is 0 kJ/mol, the enthalpy change of formation of NO is +90.3 kJ/mol, and the enthalpy change of formation of H2O is -285.8 kJ/mol.

To calculate the enthalpy change for the reaction, we can use the following equation:

ΔH = (4 x -46.2 kJ/mol) + (5 x 0 kJ/mol) - (4 x +90.3 kJ/mol) - (6 x -285.8 kJ/mol)

This gives us an enthalpy change of -902.8 kJ/mol.

To convert this to the heat absorbed or released for 20.0 g of NH3, we need to multiply by the number of moles of NH3 used in the reaction. The molar mass of NH3 is 17.0 g/mol, so 20.0 g of NH3 is equal to

20.0 g / 17.0 g/mol = 1.18 moles of NH3.

The heat absorbed or released in the reaction of 20.0 g of NH3 with oxygen to produce NO and H2O is therefore -902.8 kJ/mol x 1.18 moles = -1062.3 kJ.

This means that the reaction absorbs 1062.3 kJ of heat from the surroundings.

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Answer: D

Explanation:

the atom of the metal loses one electron which becomes delocalised and is attragted by the positive nucleus leading to formation of metallic bond.

E. They form because electrons can move freely between atoms

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Answer:

Yellow does not attract hummingbirds.

Explanation:

The most food wasn't taken out of the yellow feeders.

Answer:

The results failed to support the hypothesis that hummingbirds are most attracted to the color yellow.

Explanation:Cause i got it right

The compound that have been shown in the image that is attached here is an alkane.

A hydrocarbon molecule known as an alkane only contains the atoms of carbon (C) and hydrogen (H). It is a member of the wider group of organic chemicals known as paraffins or alkanes. Alkanes are defined by the presence of single covalent connections between carbon atoms, which create a structure resembling a chain.

Because they have the most hydrogen atoms bound to each carbon atom, alkanes are noted for their poor reactivity and are categorized as saturated hydrocarbons.

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5p subshell of the indium atom ground state experience the lowest effective nuclear charge (Z or Zeff)

Atomic number of indium = 49

E.C of indium = [Kr]4d¹⁰5S²5p¹

The outer 3 electrons indicate that indium is a 3rd group element

In the ground state, the outer electrons of In are present in the 5s and 5p orbitals

So among 5s and 5p which will experience the lowest nuclear charge (Zeff)

The nuclear charge depends on the shape of the orbital

5s has spherical shape while 5p has DB shape

Among the spherical and DB shape, the second one experiences the lower nuclear charge.

So the answer is 5p subshell of the indium will experience the lowest effective nuclear charge (Z or Zeff)

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Answer:

Slaves were in high demand in the southern colonies because they were the main source of labor. ... Bacon and others colonists wanted to take the Natives land.

Explanation:

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atomic weights 5.91 g of sulfuric acid is S-32 O-16 Al-27 H-1

What is aluminum sulfate?

Aluminum sulfate is the most widely used aluminum coagulant.  it's available in a number of solid forms such as block, kibbled, or ground and is additionally available as a solution.

Aluminum sulfate is the most widely used aluminum coagulant.  it's available in a number of solid forms such as block, kibbled, or ground and is additionally available as a solution.

aluminium sulfate 250g= 2.55 mol  (250/98)

3Al +  2H2SO4 --------->  Al2(SO4)3 + 2H2

therefore two parts of vitriol produce one part of aluminum sulfate.

2.55mol /2 =1.275 mol  1.275mols of aluminum sulfate is produced.  

1.275 mol s multiplied by aluminum sulfate's molar mass (342g/mol) gives its mass in grams.

What are atomic weights S-32 O-16 Al-27 H-1

aluminium sulfate 250g= 2.55 mol  (250/98)

3Al +  2H2SO4 --------->  Al2(SO4)3 + 2H2

therefore two parts of vitriol produce one part of aluminum sulfate.

2.55mol /2 =1.275 mol  1.275mols of aluminum sulfate is produced.  

1.275mol s multiplied by aluminum sulfate's molar mass (342g/mol) gives its mass in grams.

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Answer:

the air mass will become colder

Explanation:

A maritime tropical air mass is moist and warm, while a continental polar air mass is dry and cold. ... When an air mass moves to a new region, it carries along its characteristic moisture and temperature. As the air moves over Earth's surface, the characteristics of the surface begin to change the air mass.

Since 273 k – 243 k equals 30, the temperature change for an object going from 273 k to 243 k is 30 k.

Colors and temperatures can both be measured in Kelvin: A temperature unit commonly used in science is the Kelvin scale. Lord Kelvin created the scale after realizing the need for one with absolute zero as the zero point, which translates to 0 K as the lowest attainable temperature, or -273,15 °C.

On the Kelvin scale, a body's temperature cannot be negative. Since the Kelvin scale's absolute zero represents the lowest temperature that may exist, it is impossible for it to be negative.

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Small molecules make up water. There are three of them: two hydrogen atoms and one oxygen atom. Hydrogen bonding is a force that holds water molecules together. It is the cause of water's extraordinary abilities.

Our bodies require water for the following reasons:

1. It soothes joints:  In the spine's disks and in joints, cartilage contains about 80% water. Over time, dehydration can reduce the joints' ability to absorb damage, which can result in joint pain.

2.It produces mucous and saliva: Saliva helps in digestion and keeps the eyes, nose, and lips moist. Wear and tear are prevented in this way. Furthermore, drinking water maintains the mouth healthy. When substituted for sweetened beverages, it can also stop tooth decay.

3. It delivers oxygen throughout the body: Blood transports oxygen to various parts of the body and contains more than 90% water.

4. It protects delicate areas of the spinal cord and brain with padding: Brain anatomy and function can be impacted by dehydration. Additionally, it contributes to the synthesis of neurotransmitters and hormones. Long-term dehydration can cause issues with reasoning and thinking.

5. It controls the body's temperature: Perspiration is the result of the middle-layers of the skin's stored water being released when the body becomes hot. Evaporation causes the body to cool. in a sport. Some scientists claim that: Source of reality When the body doesn't have enough water, it can't handle heat stress as well, and it stores more heat. Lots of water consumption may help to reduce physical stress if heat stress occurs when exercising. Yet additional research is needed to fully understand these effects.

6. Water is necessary for the digestive system: The bowel need water to operate properly. Dehydration can lead to constipation, excessive stomach acid, and digestive problems. The likelihood of stomach ulcers and heartburn has increased as a result.

7. It keeps blood pressure stable: Lack of water can cause blood to become thicker. Enough water may reduce the likelihood of vasopressin release, which reduces the risk of high blood pressure, by keeping our cells and organs hydrated.

8. Water prevents kidney damage: The kidneys are in charge of body fluid. Water deficiency may result in kidney stones and other problems. Water is required by the bowel for proper operation. Dehydration can cause digestive problems such as constipation, excessive stomach acid, and more. As a result, it is now more probable to have heartburn and stomach ulcers.

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Answer:

3.2 x 10²¹molecules

Explanation:

Given parameters:

Volume of nitrogen gas = 120cm³

Unknown:

Mass of nitrogen gas = ?

Number of molecules  = ?

Solution:

To solve this problem, note that;

   1 mole of gas occupies a volume of 22.4L at STP

  Now;

   convert 120cm³ to L ;

           1000cm³  = 1L

           120cm³ gives 0.12L

    Since;

            22.4L of gas has 1 mole at STP

            0.12L of gas will have \(\frac{0.12}{22.4}\)   = 0.0054mole at STP

So;

    Mass of N₂  = number of moles x molar mass

 Molar mass of N₂  = 2(14) = 28g/mol

    Mass of N₂  = 0.0054 x 28  = 0.15g

Now;

        1 mole of a gas will have 6.02  x  10²³ molecules

      0.0054 mole of N₂ will contain   0.0054 x  6.02  x  10²³ =

                          3.2 x 10²¹molecules

F- Altitude where air pressure reduces to 5.0×10⁴ Pa: 14.8 km.

g) Dominant greenhouse gases: H₂O, CO₂, CH₄, O₃; Anthropogenic changes increase CO₂, CH₄, N₂O.

h) Mass of moist air with 8 N₂ molecules, 3 O₂ molecules, and 3 H₂O molecules: 134 grams.

F: Using the formula Altitude = Scale Height × ln(P₀/P₁), where Scale Height = 7.4 km, P₀ = 1.01×10⁵ Pa, and P₁ = 5.0×10⁴ Pa, we can calculate the altitude.

Altitude = 7.4 km × ln(1.01×10⁵ Pa / 5.0×10⁴ Pa) ≈ 14.8 km

h)

To calculate the mass of moist air containing 8 Nitrogen molecules, 3 Oxygen molecules, and 3 Water Vapor molecules, we need to determine the total number of moles for each molecule and then calculate the total mass.

Molar mass of Nitrogen (N₂) = 14 g/mol

Molar mass of Oxygen (O₂) = 16 g/mol

Molar mass of Water Vapor (H₂O) = 18 g/mol

Number of moles of Nitrogen = 8 molecules / 2 = 4 moles

Number of moles of Oxygen = 3 molecules / 2 = 1.5 moles

Number of moles of Water Vapor = 3 moles

Total mass = (4 moles × 14 g/mol) + (1.5 moles × 16 g/mol) + (3 moles × 18 g/mol)

= 56 g + 24 g + 54 g

= 134 g

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Answer:

Multicellular organisms have cells that are organized in specific ways to perform specialized functions. From the most complex level to the simplest level, the five levels of organization for the sheep should be ordered as:

whole organism → organ system → organ → tissue→ cell

Explanation: