You are riding a bicycle. If you apply a forward force of 125 N, and you and

the bicycle have a combined mass of 82 kg, what will be the forward

acceleration of the bicycle? (Assume there is no friction. )

O A. 1. 52 m/s2

B. 1. 67 m/s2

C. 3. 37 m/s2

D. 0. 66 m/s2

Answer:

the protons

Explanation:

the number of protons is constant for each sample of the element. If the number of protons differs, then it is a different element.

The characteristic of an element's atoms that always determines the element's identity is the number of protons. The correct option is C.

A chemical element is a substance that cannot be broken down further through any chemical reaction. Each element's atom contains a distinct number of protons.

A hydrogen atom, for example, has one proton, whereas a carbon atom has six. Ions are created by varying the number of electrons in an element's atom.

The number of protons determines an element's identity. The number of protons cannot be changed without changing the element's identity.

The atomic number increases by one when a proton is added, and the element identity changes.

Color, density, melting point, boiling point, and thermal and electrical conductivity are all properties of elements.

Thus, the correct option is C.

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Your question seems incomplete, the missing options are:

The location of valence electrons.

The number of energy levels.

The number of protons.

The number of neutrons.

Four properties of mixture are- it's constitution is present in any ratio, energy is neither produced or evolved, no fixed melting or boiling point, components can be seperated.

A mixture is composed of two or more simpler substances. These can be compounds or chemical elements. There are 2 types of mixtures- homogeneous and heterogeneous. Four properties of a mixture-

1. The constituents of mixture can be present in any ratio and has no fixed composition.

2. Energy is neither produced nor evolved to form mixture.

3. The mixture has no fixed boiling points and melting points.

4. Components of mixtures can be separated by physical methods simply.

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The molarity of the solution will be 13.12 M.

The formula used to calculate molarity is as follows:

Molarity = Number of moles of solute / Volume of solution

Consider 1L sample of the solution.

So, use the density of the solution to determine grams in 1L,

1.200 g/ML × 1000 mL = 1200g

The percent concentration by mass is 40.0% HCl.

The mass of hydrochloric acid in 1200g of solution,  

1200 × 40/100 = 480 g HCl

Use hydrochloric acid's molar mass to determine number of moles,

1 mole HCl = 36.46g

480 g = 13.17 moles HCl

The molarity of the solution will thus be 13.17/1.00 L = 13.17.

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Answer:

a protists

Explanation:

The relationship between hypotheses, laws and theories is that a law is used to explain hypothesis and theories.

A hypothesis is a tentative conjecture explaining an observation, phenomenon or scientific problem that can be tested by further investigation or experimentation.

A theory is a coherent statement or set of ideas that explains observed facts or phenomena and correctly predicts new facts or phenomena not previously observed.

A law is a statement whose sequence or relationship of phenomena is invariable under certain conditions.

This suggests that a law can be used to explain a theory and hypothesis.

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There are 0.1247 moles of calcium in 5.00 g of calcium.

The formula to calculate the number of moles is:

moles = mass (in grams) / molar mass

Substituting the values we have:

moles of calcium = 5.00 g / 40.08 g/mol

moles of calcium = 0.1247 mol

A mole is a unit of measurement that represents a certain number of particles. Specifically, one mole of a substance contains Avogadro's number of particles, which is approximately 6.02 x 10^23. These particles can be atoms, molecules, ions, or any other type of particle that can exist in a chemical system.

The concept of moles is important because it allows chemists to easily convert between the mass of a substance and the number of particles it contains. This is because the molar mass of a substance, which is the mass of one mole of that substance, is equal to the sum of the atomic masses of all the atoms in one molecule of that substance. This means that if you have 18 grams of water, you have one mole of water, and if you have any other mass of water, you can easily calculate how many moles of water you have using the molar mass.

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Answer:

1) The volume occupied by an atom is composed of mainly empty space

2) Atoms have a very small, relatively dense, central nucleus that is positively charged

3) The region around the nucleus of an atom are orbited by negatively charged electrons in a the same fashion planets orbit around the Sun.

Explanation:

The selection of gold for the gold foil experiment was due to its ability to be rolled into extremely thin sheets such that it was expected for alpha particle to perforate or pass through the foil.

Answer:

90.18g

Explanation:

1mole—>40.08g of Ca

2.25moles—> ?

2.25×40.08=90.18g

Answer:

d = 0.5×10¹g/cm³

Explanation:

Given data:

Volume of material = 2 m³

Mass of material = 1×10⁴ Kg

Density of material = ?

Density:

Density is equal to the mass of substance divided by its volume.

Formula

d = m/v

Solution:

Volume of material = 2 m³

1 m³ = 1000000 cm³

2 ×10⁶cm³

Mass of material = 1×10⁴ Kg

1 Kg = 1000 g

1×10⁷ g

by putting values into density formula

d = 1×10⁷ g/2 ×10⁶cm³

d = 0.5×10⁷⁻⁶ g/cm³

d = 0.5×10¹g/cm³

One way to distinguish between a solution that contains both Mg²⁺ and Ca²⁺ from one that contains only Mg²⁺ without a flame test is by using a precipitation reaction.

A common reagent used for this purpose is sodium phosphate (Na₃PO₄), which reacts with Ca²⁺ions to form a white precipitate of calcium phosphate (Ca₃(PO₄)₂). Therefore, if a solution contains both Mg²⁺ and Ca²⁺, adding sodium phosphate to the solution will result in the formation of a white precipitate. On the other hand, if a solution contains only Mg²⁺, adding sodium phosphate will not result in any visible precipitate. By observing the presence or absence of a precipitate, we can distinguish between the two solutions.

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Answer:

Mountains

Explanation:

Mountains are colder than the lower elevations.  When humid air enters a cooler region, the saturated air begins to cool  and this reduces the ability of the air to maintain the evaporated water is the gas state.  Molecules of water have reduced enerfy at the cooler temperatures.  They will slow down and coalesce with other water molecules to form small droplets of water.  The atmoshere cannot hold these heaevier droplets and they begin to fall  (i.e., rain).

One migh ask why does the air temperature drop at higher altitudes?  Heat rises, so why shouldn't it be warmer on top a mountain, compared to the valley.  The reason is that the atmosphere becomes less dense the further from Earth's center on gets.  This less dense air has a lower water saturation point, so it rains.

Answer:

Ga2O3 + 6Li ------> 3Li2O + 2Ga

Answer:

1 Ga2O3 + 6Li——-> 3 Li2O + 2 Ga

Explanation:

Answer:

Model 2 and model 3

Explanation:

Both atomic models represent hydrogen, which consists of one proton in the nucleus. Both atomic models consists of 1 proton, which means that both their atomic numbers are equal to 1

There are one moles of sodium chloride must enter solution in order to completely precipitate the silver ions in one mole of silver nitrate .

Calculation ,

To find number of moles of sodium chloride , we have to write first balanced chemical equation when sodium chloride reacts with silver nitrate .

So , the balanced chemical equation when sodium chloride reacts with silver nitrate is given as ,

\(NaCl + AgNO3\) → \(NaNO3+ AgCl\)

From the above equation we can conclude that molar ratio is equal to 1:1

It means that one mole sodium chloride is required to react with one mole of silver nitrate .

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The rate constant at 227°C is a. 6.7 x \(10^{-22}\).

The Arrhenius equation states that the rate constant (k) is equal to A × e(-Ea/RT).

Given values:  A = 2.2 x 10¹³ s⁻¹, Activation energy (Ea) = 150 kJ/mol, Temperature (T) = 227°C = 500 K.

For this, we need to substitute the given values in the Arrhenius equation as

k = A × e(-Ea/RT)

k = 2.2 x 10¹³ s⁻¹ × e(-150000 J/mol / (8.31 J/mol-K × 500 K))

k = 2.2 x 10¹³ s⁻¹ × e(-30.12)

k = 6.69 x 10⁻¹² s⁻¹

Therefore, the value of the rate constant at 227°C is 6.69 x 10⁻¹² s⁻¹. Hence, option A is the correct answer.

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Answer:

dgdgdf

Explanation:

and yeah thatds it

False. The addition of a solute to a solvent typically lowers the freezing point of the solution compared to the freezing point of the pure solvent.

This is due to the fact that the solute particles interfere with the arrangement of the solvent particles, which makes it more difficult for the solution to freeze. As a result, the solution has to be cooled to a lower temperature in order for it to freeze, which results in a lower freezing point compared to the pure solvent. Freezing point depression is a colligative property, which means that it depends on the concentration of solute particles in the solution, rather than on their chemical nature. When a non volatile  solute (a solute that does not evaporate at room temperature) is dissolved in a solvent, it increases the number of solute particles in the solution. These solute particles interfere with the arrangement of the solvent particles, making it more difficult for the solvent to freeze. As a result, the solution has to be cooled to a lower temperature in order for it to freeze, which results in a lower freezing point compared to the pure solvent. To summarize, the addition of a non volatile solute to a solvent typically lowers the freezing point of the solution, and therefore the statement "The freezing point of the solution is unchanged by the addition of the solvent" is false.

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Answer:

180 g

Explanation:

Answer:

the organisms themselves,other organisms,interactions between living organisms, and even their waste.

Answer:

Einstein also in 1905 mathematically proved the existence of atoms, and thus helped revolutionize all the sciences through the use of statistics and probability. Atomic theory says that any liquid is made up of molecules (invisible in 1905)

Explanation:

Answer:

The discoveries of Albert Einstein led to development in the understanding of the atom through the study of quantum mechanics and the electron cloud. In this model, there is still a nucleus with protons and neutrons. But unlike the Bohr model, the electrons exist in a cloud outside the nucleus, much like the fruit around the pit of a peach.

Explanation:

Answer:

(a) 55 kJ of heat are released when 1 mol of reactant A is used;

(b) 110 kJ of heat are released when 2 moles of reactant A are used;

(c) 27.5 kJ of heat are released when 1 mol of reactant B is used;

(d) 55 kJ of heat are released when 2 moles of reactant B are used.

Explanation:

The question requires us to determine the amount of heat released when the given amounts of reactants are used, considering the following balanced chemical equation:

When the enthalpy change for a reaction (or heat of reaction, ΔH) is given in units of energy, such as kilojoules (kJ), and not units of energy per mol (such as kJ/mol), we can consider that ΔH corresponds to the heat absorbed or released for the molar quantities of reactants as given in the balanced chemical equation. In the case given by the question, for example, we can say that 55 kJ of energy are released when 1 mol of A reacts with 2 moles of B.

Therefore, we can use the molar quantitites from the balanced chemical equation as a reference to determine the amount of heat released when different amounts of reactants are used.

Considering the information above, we can calculate:

(a) heat released when 1 mol of A reacts:

Note that 1 mol of A corresponds to the amount of reactant A given by the balanced chemical equation. Therefore, 55kJ of energy are released when 1 mol of A is used.

(b) heat released when 2 moles of A reacts:

Note that 2 moles of A corresponds to the double of the amount of reactant A given by the balanced chemical equation. Thus, we must multply ΔH by 2: 55 kJ x 2 = 110 kJ of energy are released when 2 moles of A are used.

(c) heat released when 1 mol of B reacts:

Note that 1 mol of B corresponds to half of the amount of reactant B given by the balanced chemical equation. Thus, we must divide ΔH by 2: 55 kJ / 2 = 27.5 kJ of energy are released when 1 mol of B is used.

(d) heat released when 2 moles of B reacts:

Note that 2 moles of B corresponds to the amount of reactant B as given by the balanced chemical equation. Therefore, 55 kJ of energy are released when 2 moles of B are used.

section 5:

1. D

2.E

3.F

4.A

5. C

6. B

Answer:

5 Match each picture with a correct word or expression

1. el premio d.

2. la vuelta a Francia e.

3. los juegos Olímpicos f.

4. soy musculoso a.

5. hacemos ejercicio c.

6. metimos un gol b.

6 Translate the following sentences into spanish:

1. I like watching the olympic games

Me gusta ver los juegos Olímpicos

2. the pan American games are a very important competition

Los juegos Panamericanos son una competición muy importante

3. to stay fit it is good to follow a well balanced diet

Para mantenerse en forma es bueno seguir una dieta sana y equilibrada

4. to score a goal it is necessary to play on a team

Para marcar un gol es necesario jugar en equipo

5. The tour de France is the most famous cycling competition in the world

El Tour de Francia es la competición de ciclismo más famosa del mundo.

6. the world cup is the most popular sporting event in the world

La copa del mundo es el evento deportivo más popular del mundo

I highly recommend to read this carefully.

Answer:

volume= 3

Explanation:

D=m/v

2.7=8.1/v

2.7v=8.1

8.1/2.7= 3

8.1/3= 2.7 which is the density!

Answer:

3 mL

Explanation:

\(V = \frac{8.1 g}{3 mL} = 2.7 g/mL\)

Answer:

A

Explanation:

Just Because

The arrow shows movement counterclockwise. The arrows indicate air moves in a direction that creates land breezes. The correct option is A.

The study of the oceans in a whole is known as oceanography. Numerous subjects are covered by oceanography, including marine life and ecosystems, currents and waves, the movement of sediments, and the geology of the ocean floor.

The arrows depict the air's motion as land breezes develop. Land cools far more quickly than water does in coastal regions, which causes the air above it to also cool.

When this occurs, it travels downward and toward the land while becoming denser. Due to the high pressure, winds are forced to blow in the direction of the water (ocean).

Therefore, the correct option is A. Air moves in a direction that creates land breezes.

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The limiting reactant is oxygen. 1760.40 g and 901.00 g of carbon dioxide and water are produced, respectively. 114.8 g of the excess reactant remain after the limiting reactant is totally consumed.

The limiting reactant is the reactant that is completely consumed in a chemical reaction and determines the amount of product formed. To determine the limiting reactant, we need to compare the amount of each reactant present to the amount required by the balanced chemical equation.

The balanced chemical equation for the combustion of butane is:

2 C₄H₁₀ + 13 O₂ → 8 CO₂ + 10 H₂O

From the balanced equation, we can see that 2 moles of butane react with 13 moles of oxygen to produce 8 moles of carbon dioxide and 10 moles of water. We can use the molar masses of each reactant to determine the number of moles present:

moles of butane = 696 g / 58.12 g/mol = 11.98 mol

moles of oxygen = 2080 g / 32.00 g/mol = 65.00 mol

Next, we can compare the amount of each reactant present to the amount required by the balanced equation:

11.98 mol butane / 2 mol = 5.99

65.00 mol oxygen / 13 mol = 5.00

Since the ratio for oxygen is smaller, oxygen is the limiting reactant. We can use the ratio of the limiting reactant to determine the amount of product formed:

5.00 (8 mol CO₂) = 40.00 mol CO₂

5.00 (10 mol H₂O) = 50.00 mol H₂O

We can then use the molar masses of each product to determine the mass of each product formed:

mass of CO₂ = 40.00 mol (44.01 g/mol) = 1760.40 g

mass of H₂O = 50.00 mol (18.02 g/mol) = 901.00 g

Finally, we can use the ratio of the limiting reactant to determine the amount of excess reactant remaining

5.00 (2 mol butane) = 10.00 mol butane

11.97 mol butane - 10.00 mol butane = 1.97 mol butane

1.97 mol butane (58.12 g/mol) = 114.8 g butane

So, the limiting reactant is oxygen, 1760.40 grams of carbon dioxide and 901.00 grams of water will be produced, and 114.8 grams of butane will remain after the limiting reactant is totally consumed.

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At pH 7, groups with pKa values above 7 will be deprotonated, those with pKa values below 7 will remain protonated, and those around 7 will be partially ionize.

This is due to the side chain of histidine having a pKa value of 6.0. The two acidic amino acids are aspartate and glutamate, and at a physiological pH of 7, they both contain a complete negative charge on their side chains.

Tyrosine and serine are two more amino acids that can be deprotonated at high pH levels, although they mostly reside in their protonated, neutrally charged states at physiological pH levels. Ionizable functional groups can be found in amino acids.

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One of the isomers of C4H10O that is an alcohol is the 1-butanol or butyl alcohol:

Another of the alcohols that has the given formula is tert-butanol or tert-butyl alcohol:

The third isomer of C4H10O is 2-butanol:

And the last isomer is isobutanol or isobutyl alcohol:

The balanced equation of Iodine and Starch complex during the test for starch is I₂ + I⁻ → I₃⁻.

When iodine is added to a starch, a deep blue solution is formed due to the presence of Amylose in starch.

Iodine -potassium reagent is often for the test of starch because iodine is not very soluble in water, thus the dissolution of iodine in water is enabled by the presence of potassium.

I₂ + I⁻ → I₃⁻

Thus, the balanced equation of Iodine and Starch complex during the test for starch is I₂ + I⁻ → I₃⁻.

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