How many joules of heat are absorbed to raise the temperature of 435 grams of water at 1 atm from 25°C to its boiling point, 100.°C?

Answer:

Eukaryotic cells

Explanation:

Prokaryotic cells do NOT have nuclei.

I hope this helps, and as always, I am joyous to assist anyone at any time.

Answer:

1- Equilibrium determines the rate of reactants and products at the same time.

General expression for equilibrium:

                                     Reactants⇌ Products

2- At equilibrium, all the reactants and products are constant.

3- At equilibrium forward and reverse reaction does not stop, in fact, it continues at all times.

4- When the concentrations of reactants and products become equal dynamic equilibrium is obtained.

For example:

         A + B ⇌ C + D

In this reaction, if the concentration of reactant  A has increased the equilibrium will shift to the right to form more products.

If the concentration of reactant A has decreased the equilibrium will shift to the left in the backward direction to form reactants.

Answer:At equilibrium, the forward and backward reaction rate is the same.

Explanation:The equilibrium counteracts any change in the condition of the reactant or product. The le'chatalier principle highlights three main factors that affect the state of equilibrium. The three factors are: amount of moles, concentration and pressure.If the amount of reactant is increased, the equilibrium will shift to the right in order to create a balance between the forward and backward reaction and vice versa.

Answer:

10

Explanation:

The atomic mass = 20

The atomic number = 10

The number of neutrons = mass - number = 20 - 10 = 10

This formula is always true. There are no exceptions.

C=n/V

V=n/C=0.34/0.0606=5.61L

I would go with option D.integumentary system

Answer:

Explanation:

1) Percent formula: % = (mass of solue / mass of solution)×100

Substitue the values in the percent formula:

Mass of solute = 2.26 g ← answer

2) Mass of solution = mass of solute + mass of solvent

Answer:

[tex]\boxed{\text{Mass of solute = 2.26 g; mass of solution = 47.1 g}}[/tex]

Explanation:

[tex]\text{Mass percent} = \dfrac{\text{mass of solute }}{\text{mass of solute + mass of solvent}} \times 100 \, \%[/tex]

1. Calculate the mass of solute

Let x = mass of solute. Then

[tex]\begin{array}{rcl}4.8 & = & \dfrac{x}{x + 44.8} \times 100\\\\4.8(x + 44.8) & = & 100x\\4.8x + 215 & = & 100x\\215 & = & 95.2x\\\\x & = & \dfrac{215}{95.2}\\\\x & = & \textbf{2.26 g}\\\end{array}[/tex]

2. Calculate the mass of solution

Mass of solution = mass of solute + mass of  solvent = (2.26 + 44.8) g

= 47.1 g

[tex]\boxed{\textbf{Mass of solute = 2.26 g; mass of solution = 47.1 g}}[/tex]

To find the volume of hydrochloric acid (HCI) required to react completely with aluminum hydroxide (AI(OH)3), use the balanced chemical equation and stoichiometry. The equation is AI(OH)3 (s) + 3HCl (aq) -> AICl3 (aq) + 3H2O (l). Convert the mass of AI(OH)3 to moles, then use the mole ratio to find the volume of HCl.

To find the volume of hydrochloric acid (HCI) required to react completely with aluminum hydroxide (AI(OH)3), we need to use the balanced chemical equation for the reaction and the stoichiometry of the reaction.

The balanced chemical equation is: AI(OH)3 (s) + 3HCl (aq) -> AICl3 (aq) + 3H2O (l)

From the equation, we can see that 1 mole of AI(OH)3 reacts with 3 moles of HCl. Given that the concentration of HCl is 0.500 mol/L, we can convert the mass of AI(OH)3 to moles, then use the mole ratio to find the volume of HCl:

Plug in the values above to calculate the volume of HCl required.

Answer:

D-B-C-A

Explanation:

D: Atoms are hard, indivisible spheres — John Dalton: Atomic theory (1803)

B: Atoms have small, negatively charged particles — J. J. Thomson: cathode rays (1897)

C. The center of an atom is a small, dense nucleus — Lord Rutherford: gold foil experiment (1909)

A: Electrons have wavelike properties — Niels Bohr: Bohr model (1913)  

The development of the idea of atoms passed through various stages.

The history of the development of the atomic theory passed through several stages. Each stage in the development of atomic theory was backed by empirical evidence. The theory was jettisoned only when more compelling evidence suggests that the current model is inaccurate.

The order of development of atomic theory is shown below;

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Answer:

0.767 g.

Explanation:

Molarity (M) is defined as the no. of moles of solute dissolved in a 1.0 L of the solution.

M = (no. of moles of K⁺)/(Volume of the solution (L).

∵ no. of moles of K⁺ = (mass/molar mass) of K⁺.

∴ M = (mass/molar mass) of K⁺/(Volume of the solution (L).

M = 0.0044 M.

Volume of the solution = 4459.0 mL = 4.459 L.

mass of K⁺ = ??? g.

molar mass of K⁺ = 39.01 g/mol.

∴ mass of K⁺ = (M)((molar mass of K⁺)(volume of the solution (L)) = (0.0044 M)(39.10 g/mol)(4.459 L) = 0.767 g.

Answer:

it is a base because they accept H+ ions

Explanation:

The correct answer is a base because they accept H+ ions.

          [tex]OH^{-} + H^{+}[/tex]⇄ [tex]H_{2}O[/tex]

Acetic acid provides a proton and functions as an acid in this process, whereas the water molecule (base) takes a proton.

[tex]CH_{3}CO_{2}H + H_{2}O[/tex] ⇄[tex]CH_{3}CO_{2} ^{-} + H_{3}O^{+}[/tex]

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Answer:

D the liquids are allowed to seperate into layers

D. The liquids are allowed to separate into layers.

Density refers to the weight of the substance. The substance which is light in weight remains at the top of the substance which is heavy or with more density. This principle is used for separation of liquid based on their density.

In the process, the liquid sample composed of various liquids of varying density is poured in a separating funnel. The setup is left as it is without disturbance for considerable period of time. Based upon the weight of the liquid it forms a layer in which liquid with high density settles at the bottom, whereas liquid with less density remain at the top.

Answer:

chemical bonding that involves the electrostatic attraction between oppositely charged ions, and is the primary interaction occurring in ionic compounds

Explanation:

Answer: Ultraviolet

Explanation:

The Electromagnetic spectrum involves gamma rays , X rays, ultra violet rays, visible rays, infrared rays, micro waves and radio waves which are arranged in order of increasing wavelength and decreasing frequency.

The wavelength range for gamma rays is less than 0.001 nm.

The wavelength range for ultraviolet rays is 1 nm to 400 nm.

The wavelength range for visible rays is 400 nm to 750 nm.

The wavelength range for infra red rays is 700 nm to 1000000 nm.

It can be seen from the graph that the most intense radiation for the star occurs near a wavelength of 200 nm , thus the most intense radiation occurs in ultraviolet band.

Answer:

The same amount of energy as

Explanation:

The complete combustion of 1 mole of glucose in a living cell releases the same amount of energy as the complete combustion of 1 mole of glucose by fire.

The same amount of glucose contains a fixed amount of energy

Answer: The same amount of energy

Explanation: Glucose the primary source of energy for all the living organism. In order to sustain a life, organisms need to use energy for all the vital processes of the body.

Combustion of glucose inside the body or combustion of glucose outside in the environment with the help of fire will generate the same amount of energy.

Answer:

3.equal numbers of protons and neutrons.

Explanation:

A stable atom with a large nucleus would contain equal number of protons and neutrons. When the number of protons and neutrons in the nucleus are equal, an atom would attain stability.

Unstable atoms have either the number of protons or neutrons greater. In order for such atoms to attain stability, they give off the excess protons or neutrons. When atoms gives off excess protons or neutrons, they are said to be radioactive.

Answer:

More neutrons than protons

Explanation:

Answer:

The correct choices are:

Explanation:

The theoretical yield is the maximum amount of product that could be obtained by the chemical reaction, from a given amount  of reactants. You calculate the theoretical yield using the stoichiometry coefficients of the balanced chemical equation.

The percent yield is the ratio of the actual yield (the actual amount obtained) of a product to the theoretical yield for the same product, expressed as a percentage (i.e. multiplied by 100).

As the actual yield decrease (the numerator of the ratio), the percent yield decrease.

To increase the percent yield it is important:

Using accurate measurements: if you do not add the correct amounts of each reactant, then the product obtained will not be what you can predict from the theoretical calculations and  you will be wasteing one or other reactant, without reaching the maximum yield possible.

Using pure chemicals: if the chemicals are not pure, the amount of actual reactants will be lower than they should be, leading to a lower actual yield.

Performing the reaction under the most ideal conditions: the actual rate of reactions depend on the conditions: temperature and pressure are the most commons. Since, temperature and pressure may change that rate of reactions, you should find and use the most ideal conditions to get the greatest actual yield.

Adding water, can just dilute the reactants and would decrease the rate of reaction, which would not be helpful to increase the yield.

Answer is using accurate measurements

using pure chemicals

performing the reaction under the most ideal conditions

Answer:

Explanation:

The noticeable exception in the trends of ionization energy of Mg and Al can best be explained using the arrangements of the electrons in the sub-levels.

Mg with 12 electrons has an electronic configuration of 2,8,2 = 1S²2S²2P⁶3S²

Al with 13 electrons has an electronic configuration of 2,8,3 = 1S²2S²2P⁶3S²3P¹

Lets take a little peep into what ionization energy is.

Ionization energy is a measure of the readiness of an atom to lose electron. The amount of energy needed to remove an electron is called the ionization energy. In this regard, the first ionization energy is the energy need to remove the valence or the most loosely held electron in an atom.

The magnitude of the ionization energy depends on a number of factors. The most important to our discuss here are:

The arrangement of electrons in Mg confers a special stability on it because of the filled sublevel.

The maximum number of electrons in each sub-levels are:

s-orbital = 2 electrons

p- orbital = 6 electrons

d - orbital = 10 electrons

f - orbital = 14 electrons

In Mg, 1S²2S²2P⁶3S² , the outermost s-sublevel have 2 electrons and s-orbital can accomodate a maximum of 2 electrons in this subshell. This makes the arrangement stable.

For Al, 1S²2S²2P⁶3S²3P¹,  the outermost p-subshell houses just one electron but it can accommodate a maximum of 6 electrons. This arrangement is unstable.

Due to this electron arrangements, Mg would have a very stable configuration and a greater first ionization energy compared to Al.

You start by diving each quantity given by the atomic wight of each element:

Phosphorus (P)   [tex]\frac{3.8}{31} =0.123[/tex]

Hydrogen (H)   [tex]\frac{0.371}{1} =0.371[/tex]

Then you divide by the lowest number:

[tex]\frac{0.123}{0.123} = 1[/tex] for phosphorus

[tex]\frac{0.371}{0.123} = 3[/tex] for hydrogen

So the empirical formula will be:    

[tex]PH_{3}[/tex]

Answer:

0.0074 °C.

Explanation:

ΔTb = i.Kb.m,

where, ΔTb is the elevation in boiling water.

i is van 't Hoff factor, The van 't Hoff factor is the ratio between the actual concentration of particles produced when the substance is dissolved and the concentration of a substance as calculated from its mass. For most non-electrolytes dissolved in water, the van 't Hoff factor is essentially 1.

i for BaCl₂ = 3/1 = 3.

Kb is the molal elevation constant of water (Kb = 0.512 °C/m).

m is the molality of the solution.

m = (no. of moles of BaCl₂)/(mass of water (kg)) = (mass/molar mass of BaCl₂)/(mass of water (kg)) = (1.5 g/208.23 g/mol)/(1.5 kg) = 0.0048 m.

∴ ΔTb = i.Kb.m = (3)(0.512 °C/m)(0.0048 m) = 0.0074 °C.

Answer:

ZINC(zn) is used as the coating layer for the iron and as well as for all ferrous materials in galvanization/galvanizing process which defined as given below.

Explanation:

Answer:

zinc

Explanation:

If the price of gasoline is 3.85 dollars per US gallon, the price per litre will be 0.844 dollars. Because 1 gallon = 4.56 litres.

Volume is used for the measurement of capacity. Thus the unit for measuring volume is basically a unit for measuring the capacity or the extent of space in an object. A unit is used to indicate the volume of goods or liquids. It should be kept in mind that mass and volume are two different physical quantities.

The SI Unit for volume is measured in cubic metres or m^3. Here the three-dimensional use of the base unit of length is used which is metres.

1 m^3 = 1 m • 1 m • 1 m.

The metric unit for volume is the litre and is widely used. Also, there are standard metric prefixes which are used for highlighting large or small volume measures. These are millilitre (ml)  which is also used as a unit for measuring volume.

Few other units are used to depict the volume. These are the British system of measurements like barrels, drams, gills, bushels, and pecks. In the British system, more standard units used are the cubic inch or cubic foot and the gallon.

Therefore, If the price of gasoline is 3.85 dollars per US gallon, the price per litre will be 0.844 dollars. Because 1 gallon = 4.56 litres.

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Final answer:

To convert the price of gasoline from $3.85 per US gallon to the cost per liter, divide $3.85 by 3.78541, which results in approximately $1.017 per liter.

Explanation:

If the price of gasoline is $3.85 per US gallon, we need to convert this to the cost per liter. Since 1 US gallon is equivalent to 3.78541 liters, we divide $3.85 by 3.78541 to get the price per liter.

The calculation is as follows:
$3.85 per gallon ÷ 3.78541 liters per gallon = approximately $1.017 per liter.

Therefore, the cost of gasoline is roughly $1.017 per liter.

A metal cooking pot is an alloy.

Hence, Option (C) is correct answer.

An alloy is a mixture of metals and other elements. It is a substance which has metallic properties.

Examples: Steel is an alloy of iron and carbon. Bronze is an alloy of copper and tin. Brass is an alloy of copper.

A metal cooking pot are made from stainless steel, cast iron, copper or glass.

Thus, from the above conclusion we can say that A metal cooking pot is an alloy.

Hence, Option (C) is correct answer.

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Insulin has a complex structure that involves primary, secondary, tertiary, and quaternary levels, with its three-dimensional tertiary structure being essential for its biological function.

The structure of insulin can be described in terms of primary, secondary, tertiary, and quaternary levels. The primary structure refers to its amino acid sequence. Insulin exhibits a secondary structure through regions of alpha-helices and beta-sheets. The tertiary structure of insulin is its unique three-dimensional shape resulting from the folding of the protein, and is essential for its biological function. Finally, insulin may also exhibit a quaternary structure when two insulin monomers (A and B chains) come together, stabilized by disulfide bonds and other interactions, as seen in its storage form within the body.

Answer:

Humidity is the answer.

A change in the molecular structure is an indication that a substance has undergone a chemical change. Hence, option D is correct.

Molecular geometry, also known as the molecular structure, is the three-dimensional structure or arrangement of atoms in a molecule.

Some signs of a chemical change are a change in colour and the formation of bubbles.

The five conditions of chemical change: colour change, formation of a precipitate, formation of a gas, odour change, temperature change or change in molecular structure.

Hence, option D is correct.

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Answer:

B

Explanation:

a metal with a large number of free-flowing electrons most likely have good conductivity

Answer: Option (d) is the correct answer.

Explanation:

Ability of an element or substance to conduct electricity is known as conductivity. Also, flow of electric current is the flow of free electrons.

It is known that metals contain more number of free electrons and they are good conductors of heat and electricity. Metals are hard substances.

Whereas non-metals are brittle and they are poor conductors of heat and electricity.

Thus, we can conclude that the property of a metal with a large number of free-flowing electrons most likely have good conductivity.

Answer:

53 cm³

Explanation:

When the student used dilute sulfuric acid, the reaction was complete after 60 s, because no more hydrogen was formed in the next 10 s.

The reaction would go faster if the student used a more concentrated acid, but 53 cm³ of hydrogen is the most that would form.

Answer:

10

Explanation:

You can tell with the name of the molecule. Just remember that the prefix will tell you how many.

di = 2

deca = 10

The name of the molecule is

disulfur decaflouride

This means that there are 2 sulfur atoms and 10 flourine atoms.

To eliminate the other choices:

penta = 5

pentadeca = 15