5. When it is used as a fuel, hydrogen combines with substance X.
What is X?
A. carbon
B. methane
C. nitrogen
D. oxygen

Explanation:

Find the mole weight of CO :

C = 12.011  gm/ mole

O =15.999 gm/mole

  total = 28.01  gm /mole

42 gm  is then   42 gm / 28.01 gm/mole = 1.5 mole  of CO

Gases occupy   22.4 liters per mole at STP

    22.4 L / mole * 1.5 mole = 33.6 liters

The mass of the liquid, in pounds, with a density of 0.88 g/ml and a volume of 2000 liters, would be approximately 979 pounds.

To calculate the mass in pounds, we need to convert the given volume of the liquid from liters to milliliters, and then multiply it by the density of the liquid.

First, we convert 2000 liters to milliliters by multiplying by 1000:

2000 liters * 1000 ml/liter = 2,000,000 ml.

Next, we multiply the volume in milliliters by the density of the liquid:

2,000,000 ml * 0.88 g/ml = 1,760,000 g.

To convert the mass from grams to pounds, we divide by the conversion factor of 453.6 grams per pound:

1,760,000 g / 453.6 g/lb ≈ 3,877.95 pounds.

Rounding to the nearest pound, the mass of the liquid is approximately 979 pounds.

Therefore, if there are 2000 liters of this liquid with a density of 0.88 g/ml, the mass would be approximately 979 pounds.

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Answer:

B) Rubbing alcohol

Explanation:

It is a solution

I think its A. Low pressure indicates rising air, Which allows clouds to from.

Answer:

Heat Capacity = E / T.

- Find the difference in temperature for changes of multiple degrees.

- Add the appropriate units to your answer to give it meaning.

- Know that this equation works for cooling objects as well.

- Know that specific heat refers to the energy needed to raise one gram by one degree.

Answer:

A = 2

B = 1

Explanation:

The atomic number of lithium is 3.

Its atomic mass is 7 amu.

It is present in group group 1.

It has one valance electron.

Lithium is alkali metal it form salts.

It is silvery soft metal. It has lowest density as compared to all other metals.

It react vigorously with water.

It is used in rechargeable batteries which are used in camera, mobile, laptops etc.

The electronic configuration of Li:

Li₃ = 1s² 2s¹

Thus,

A = 2

B = 1

The formation of rust (equation above) is an example of both combustion and Synthesis

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Answer:

synthesis

Explanation:

Answer:

B. Lava flows may cause tsunamis.

Atomic mass calculated as the sum of protons and neutrons, it is measured in amu. This is because protons and neutrons each have a mass of 1 amu.

The sum of the masses of the protons, neutrons, and electrons in an atom or collection of atoms is known as the atomic mass. Since electrons are far lighter than protons or neutrons, the computation does not take their mass into account. A single atom's atomic mass is only its total mass, and it is usually given in atomic mass units, or amu.

Atomic mass = total number of protons present in the nucleus + total number of neutrons present in the nucleus of an atom

For elements having isotopes relative atomic masses are taken in consideration. The relative atomic mass is an average of the atomic masses of all the different isotopes.

Example- The atomic mass of carbon atom -  with six neutrons and 6 protons the atomic mass is 12 amu.

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Answer:

Rainfall can affect influent flow rate and compositions of wastewater, and thus further affect wastewater treatment performance and the effluent quality.

Explanation:

The burning of fossil fuels primarily impacts the carbon cycle, specifically the release of carbon dioxide (CO2) into the atmosphere. This increased concentration of CO2 contributes to the greenhouse effect and climate change. Additionally, the burning of fossil fuels can indirectly affect other biogeochemical cycles, such as the nitrogen cycle, through the production of nitrogen oxides (NOx) and their subsequent impacts on ecosystems.

The burning of fossil fuels, such as coal, oil, and natural gas, releases large amounts of carbon dioxide (CO2) into the atmosphere. This release disrupts the balance of the carbon cycle, which is responsible for the exchange and cycling of carbon between the atmosphere, land, and oceans. Fossil fuels, formed from ancient plant and animal matter, contain carbon that has been stored underground for millions of years. When burned for energy, the carbon is rapidly released as CO2, adding to the atmospheric pool of carbon and increasing the concentration of greenhouse gases.

The increased concentration of CO2 in the atmosphere contributes to the greenhouse effect, trapping heat and leading to global warming and climate change. This impacts various aspects of the Earth's systems, including temperature patterns, weather events, and sea-level rise.

Furthermore, the burning of fossil fuels can indirectly impact other biogeochemical cycles, such as the nitrogen cycle. Fossil fuel combustion releases nitrogen oxides (NOx), which are air pollutants that contribute to air pollution and acid rain. Nitrogen oxides can react with other atmospheric compounds and form nitric acid, which can be deposited onto land and water bodies through precipitation. This influx of nitrogen compounds can disrupt natural nitrogen cycling processes, affecting ecosystems, nutrient availability, and aquatic habitats.

In conclusion, the burning of fossil fuels primarily affects the carbon cycle by releasing carbon dioxide and contributing to climate change. It also has indirect impacts on other biogeochemical cycles, such as the nitrogen cycle, through the release of nitrogen oxides and subsequent ecological consequences. It is essential to reduce reliance on fossil fuels and transition to sustainable and renewable energy sources to mitigate these negative effects on biogeochemical cycles and promote a healthier planet.

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Fusion powers the sun. This creates nuclear energy, which then goes to earth in the form of radiation. The plants get sunlight and photosynthesise (the process of getting glucose by sunlight). The answer should be C.

The name of the ionic compound made of beryllium and chlorine is Beryllium chloride (option D).

Ionic compounds are compounds that are made up of oppositely charged ions. These ions are formed by transferring electrons from one atom to another. They are made up of cations and anions. Cations are positively charged ions, whereas anions are negatively charged ions.

The formation of ionic compounds involves the transfer of electrons from the metal to the non-metal. This creates oppositely charged ions that are attracted to each other, forming the ionic bond between them.

The formula for an ionic compound represents the ratio of cations to anions in the compound.

Examples of ionic compounds are sodium chloride (NaCl), magnesium oxide (MgO), and calcium chloride (CaCl2).

Thus, the correct answer is option D, beryllium chloride.

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Answer:

Its 2 and 3

Explanation:

Answer:

5.9 × 10² kJ

Explanation:

When carbon disulfide, CS₂, forms from its elements, heat is absorbed. The corresponding value for the standard enthalpy of formation of carbon disulfide is 117.36 kJ/mol. The thermochemical equation that represents this process is:

C(graphite) + 2 S(s, rhombic) ⇒ CS₂(g)   ΔH°f = 117.36 kJ/mol

117.36 kJ of heat are absorbed when 1 mole of CS₂ is formed. The amount of heat absorbed when 5.0 moles of CS₂ are formed is:

5.0 mol × 117.36 kJ/mol = 5.9 × 10² kJ

Explanation:

We have a 63.9 g sample of calcium hydroxide. First we have to convert those grams into moles. To do that we have to use the molar mass of calcium hydroxide.

Calcium hydroxide = Ca(OH)₂

molar mass of Ca = 40.08 g/mol

molar mass of O = 16.00 g/mol

molar mass of H = 1.01 g/mol

molar mass of Ca(OH)₂ = 1 * 40.08 g/mol + 2 * 16.00 g/mol + 2 * 1.01 g/mol

molar mass of Ca(OH)₂ = 74.10 g/mol

mass of Ca(OH)₂ = 63.9 g

moles of Ca(OH)₂ = 63.9 g /(74.10 g/mol)

moles of Ca(OH)₂ = 0.862 moles

In 1 molecule of Ca we have 2 atoms of O. So in 1 mol of Ca(OH)₂ we will have 2 moles of O atoms.

1 mol of Ca(OH)₂ = 2 moles of O atoms

moles of O atoms = 0.862 moles of Ca(OH)₂ * 2 moles of O /1 mol of Ca(OH)₂

moles of O atoms = 1.724 moles

One mol is similar to a dozen. When we say that we need a dozen eggs we know that we need 12 eggs. If we want a mol of eggs, we want 6.022*10^23 eggs. So one mol of something is 6.022 * 10^23 of that.

1 mol of O atoms = 6.022 * 10^23 atoms

n° of O atoms = 1.724 moles * 6.022 * 10^23 atoms/1 mol

n° of O atoms = 1.04 * 10^24 atoms

Answer: In a 63.9 g sample of Ca(OH)₂ we have 1.04 *10^24 atoms of oxygen.

The pH at the start of the titration is approximately 0.464.

To find the pH at the start of the titration, we need to consider the dissociation of hypochlorous acid (HOCl) in water.
Hypochlorous acid (HOCl) dissociates into hydrogen ions (H+) and hypochlorite ions (OCl-) in water. The dissociation reaction can be represented as:

HOCl ⇌ H+ + OCl-

The pH of a solution is determined by the concentration of hydrogen ions (H+). At the start of the titration, before any sodium hydroxide has been added, the concentration of H+ ions is determined by the concentration of hypochlorous acid (HOCl).
Given that the concentration of the hypochlorous acid solution is 0.343 M, we can assume that the initial concentration of H+ ions is also 0.343 M.
The pH of a solution can be calculated using the formula: pH = -log[H+]
Substituting the value of the initial concentration of H+ ions into the equation, we get:

pH = -log(0.343)

Calculating this using a calculator, the pH at the start of the titration is approximately 0.464.

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Answer:

_2Mg + _O2 --≥2MgO this is balanced

If energy flows into a chemical system and out of the surroundings, the sign of δesystem will be positive. This indicates that the system is gaining energy from its surroundings.

In thermodynamics, the change in energy of a system is measured by its internal energy, represented by the symbol U. If the internal energy of a system increases, the system is said to have gained energy, and the sign of δU is positive. According to the First Law of Thermodynamics, energy can neither be created nor destroyed, only transferred or transformed from one form to another. Therefore, if energy is flowing into a chemical system, it must be coming from the surroundings, which means that the surroundings are losing energy. The sign of δesurroundings will be negative, indicating that the surroundings are experiencing a decrease in energy.

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The symbol of barium ion is Ba²⁺. Barium looses two electrons and get positively charge, and it became cation.

Positively charged ions are known as cations. Negatively charged ions are referred to as anions. A charged atom or molecule is an ion. A balanced atom will change into a positively charged cation if one or more of its electrons are lost.

Because they are positively charged and move toward the negative electrode in an electrical field, these ions are referred to as "cations."

The barium ion has a charge of 2+, or a positive charge of two. To become a positively charged ion known as a cation, the barium ion must give up two electrons. Atoms replicate the electron configuration of the closest noble gas by transforming into ions.

Thus,  To become a positively charged ion known as a cation, the barium ion must give up two electrons.

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The side chain of which amino acid is most likely to form a hydrogen bond with the side chain of glutamate is: lysine.

The side chain of lysine is most likely to form a hydrogen bond with the side chain of glutamate. Lysine and glutamate are both amino acids. Amino acids are the building blocks of proteins. The two side chains of amino acids can interact via hydrogen bonding.

A hydrogen bond is a non-covalent interaction between two electronegative atoms in which hydrogen is bonded to one atom and electronegative (N, O, or F) is bonded to another atom. These types of interactions are crucial in the stabilization of proteins and nucleic acids.

Amino acids that interact via hydrogen bonding play a key role in stabilizing the three-dimensional structure of proteins. Proteins can be stabilized by hydrogen bonding in a variety of ways, including within the polypeptide backbone, between the polypeptide backbone and side chains, and between two side chains.

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Without additional information such as the volume of water and the initial amount of zinc used, it is not possible to determine the concentration or calculate the average rate of the reaction accurately.

To calculate the average rate of the reaction, we would need to know the change in concentration of the reactants or products over a specific time interval.

The reaction between solid zinc (Zn) and hydrochloric acid (HCl) to produce hydrogen gas (H2) and zinc chloride (ZnCl2) can be represented as follows:

Zn(s) + 2HCl(l) → H2(g) + ZnCl2(aq)

In this case, a piece of solid zinc was put into pure water, which is effectively the same as diluting the hydrochloric acid to a very low concentration. Given that all the zinc has reacted after 15 seconds, we can assume that the reaction has gone to completion within that time frame.

Since all the zinc has reacted, we can calculate the concentration of hydrogen gas produced. However, without additional information such as the volume of water and the initial amount of zinc used, it is not possible to determine the concentration or calculate the average rate of the reaction accurately.

To calculate the average rate of the reaction, we would need to know the change in concentration of the reactants or products over a specific time interval.

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Molarity= No of moles of solute * 1000 / vol solution in ml

No of moles= Given mass / Molar mass

Given Mass of solute (H2O2)= 10g

Molar mass of H2O2=34gmol^-1

No of moles= 10/34= 0.294 moles

Volume of solution=50ml

Molarity =   0.294*1000 / 50

Molarity = 5.8M

Answer: A

Explanation: The water vapors after condensation are turned into water droplets which are inside the clouds, moving around the world.

Answer:

1. V2.

2. 299K.

3. 451K

4. 0.25 x 451 = V2 x 299

Explanation:

1. The data obtained from the question include:

Initial volume (V1) = 0.25mL

Initial temperature (T1) = 26°C

Final temperature (T2) = 178°C

Final volume (V2) =.?

2. Conversion from celsius to Kelvin temperature.

T(K) = T (°C) + 273

Initial temperature (T1) = 26°C

Initial temperature (T1) = 26°C + 273 = 299K

3. Conversion from celsius to Kelvin temperature.

T(K) = T (°C) + 273

Final temperature (T2) = 178°C

Final temperature (T1) = 178°C + 273 = 451K

4. Initial volume (V1) = 0.25mL

Initial temperature (T1) = 299K

Final temperature (T2) = 451K

Final volume (V2) =.?

V1 x T2 = V2 x T1

0.25 x 451 = V2 x 299

Covalent bonding can be defined as the sharing of electrons between two atoms.

The statement which best explains the difference between polar and nonpolar covalent bonds is "Polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally"

We have:

Therefore, the statement which best explains the difference between polar and nonpolar covalent bonds is "Polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally"

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a. The moles of the Cu²⁺ are in the solution is 0.0035 mol.

b. The moles of the copper(II) are present per gram of the solution is 0.0042 mol/g.

The mass of the Cu²⁺ complex = 0.828 g

The volume of the nitric acid = 20 mL

The concentration of the solution = 0.175 M

a. The moles of the Cu²⁺ = molarity × volume in L

The  moles of the Cu²⁺ = 0.175 × 0.020

The  moles of the Cu²⁺ = 0.0035 mol

b. The moles of the copper(II) are in the per gram of the complex :

Moles per gram = 0.0035 mol / 0.828 g

Moles per gram = 0.0042 mol/g

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Answer:

Long bones contain yellow bone marrow and red bone marrow, which produce blood cells.

Explanation:

Have a nice night!

The majority of your blood cells are produced in your bone marrow. This is known as haemopoiesis. In children, haemopoiesis occurs in the long bones, such as the thighbone (femur). Adults have it mostly in their spine (vertebrae), hips, ribs, skull, and breastbone (sternum).

Hematopoiesis is the process by which all the cellular components of blood and blood plasma are produced. It happens in the hematopoietic system, which includes organs and tissues like bone marrow, liver, and spleen. Simply put, hematopoiesis is the process by which the body produces blood cells.

The bone marrow is where blood cells are created. The soft, spongy material in the center of the bones is called bone marrow. It generates approximately 95% of the body's blood cells. The pelvic bones, breastbones, and spine bones contain the majority of the adult body's bone marrow.

Red cells are constantly produced in the marrow of certain bones. As previously stated, the marrow is the primary site of red cell production, known as erythropoiesis, in adults.

Thus, The majority of your blood cells are produced in your bone marrow. This is known as haemopoiesis.

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