How many atoms of hydrogen are there in one molecule of water. if the chemical formula is H202 ?

a. 0

b. 1

c. 2

d. 3

Answer:

34.9103 or 34.9 g

Explanation:

Remember Density is a broken heart: m/v.

In this scenario (Let x = # of grams in the sample of gasoline),

D = 0.7198 g/mL = x g / 48.5 mL

So,

(0.7198 g/mL) * (48.5 mL) = x g

x g = 34.9103 = 34.9 g (Accounting for Significant Figures)

Answer:

see explanation

Explanation:

grams => moles => divide by formula weight

moles => grams => multiply by formula weight

a. 6.7 grams NaOH = 6.7g/40g/mol = 0.17 mole

b. 2.5 moles CaCO₃ = 2.5 moles x 100g/mol = 250 grams

The answer is 0.365:100.

v/c ratio represents ratio of speed of an electron (v) to the speed of light (c).

How is the speed of an electron calculated?

\(v =\frac{1}{n}\; \frac{e^{2}}{4\pi \varepsilon _{0}}\times \frac{2\pi }{h}\)

Now, for the first excited state, n = 2.

e - Charge of electron = \(1.6\)×\(10^{-19}\) C

h - Plank's constant = \(6.6\)×\(10^{-34} J.s\)

ε₀- permittivity \(= 8.85\)×\(10^{-12}\)\(N^{-1}.C^{2}.m^{-2}\)

\(v =\frac{1}{2}\; \frac{e^{2}}{4\pi \varepsilon _{0}}\times \frac{2\pi }{h} =\frac{1}{4}\times \frac{(1.6\times 10^{-19})^{2}}{8.85\times 10^{-12}\times 6.6\times 10^{-34}}\\ \\ =0.01096\times 10^{8} \\ \\=1.096\times 10^{6}ms^{-1}\)

\(\frac{v}{c} =\frac{1.096* 10^{6}\ m/s }{3.0 *10^{8}\ m/s }\)= \(\frac{0.365}{100}\)

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Molecular formula naphthalene is C₁₀H₈ and empirical formula naphthalene is C₅H₄

Molecular formulas tells how many atoms of each element are present in a compound whereas empirical formulas tells the simplest or reduced ratio of elements in a compound.

Given, 93.7 g of Carbon

and 6.3 g of H

In 100 g of naphthalene we have 93.7 g of Carbon  and 6.3 g of Hydrogen

So, in 128 g of naphthalene we will have:

128 . 93.7 / 100 = 120 g of C

128.  6.3 / 100 = 8 g of H

Convert mass to moles,

120 g . 1mol / 12 g = 10 moles C

8 g . 1mol/ 1g = 8 moles H

Hence, Molecular formula naphthalene becomes C₁₀H₈

and Empirical formula naphthalene  becomes C₅H₄.

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Answer:

0.630 L of oxygen must be added at constant temperature and pressure

Explanation:

According to Avodagro's law, the volume and the number of moles are directly proportional at constant temperature and pressure. What this is saying is that at increased volume, it is expected that we have more number of moles

Mathematically, we can represent this as:

The values with subscript 1 represent the initials, while the values with subscript 2 represent the finals

We can have the formula rewritten in terms of the missing value as follows:

Using the formula, we have:

What the question is asking is the extra volume to be added

That wold be calculated as follows:

The correct option from the given statements concerning mixtures is (d) more than one correct response.

The statement (a) "The composition of a homogeneous mixture cannot vary" is incorrect as the composition of a homogeneous mixture can vary. For example, a mixture of salt and water is homogeneous and its composition can vary depending on the amount of salt and water mixed in it.

The statement (b) "A homogeneous mixture can have components present in two physical states" is correct. Homogeneous mixtures are mixtures that are uniform throughout their composition, meaning that there is no visible difference between the components of the mixture. For example, a mixture of ethanol and water is homogeneous and its components are present in two physical states (liquid and liquid).

The statement (c) "A heterogeneous mixture containing only one phase is an impossibility" is incorrect. A heterogeneous mixture is a mixture where the components are not evenly distributed and the mixture has different visible regions or phases. However, it is possible for a heterogeneous mixture to contain only one phase. For example, a mixture of oil and water is heterogeneous but can have only one phase.

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The given statement "over the last 400,000 years (and longer) carbon dioxide concentrations in the atmosphere have varied between 180-300 ppm (parts per million). use the internet to discover what the carbon dioxide concentration of the atmosphere is today" is true because of irrational human activities.

Over the last 400,000 years (and longer), carbon dioxide concentrations in the atmosphere have varied between 180-300 ppm (parts per million) based on ice core data. However, since the Industrial Revolution, human activities such as burning fossil fuels, deforestation, and land use changes have caused an increase in the concentration of carbon dioxide in the atmosphere.

According to the National Oceanic and Atmospheric Administration (NOAA), the current concentration of carbon dioxide in the atmosphere is approximately 414.66 ppm as of May 2021. This concentration is the highest it has been in at least 800,000 years, and the rate of increase is unprecedented in human history.

The increase in carbon dioxide concentration is a major contributor to global warming and climate change, which has numerous impacts on our environment and society, including sea level rise, more frequent and severe natural disasters, and changes in precipitation patterns. Reducing greenhouse gas emissions and transitioning to renewable energy sources are critical steps in mitigating the impacts of climate change.

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Answer:

0,783 mile/h

Explanation:

First you convert the dm/s into mile/s:

3,5 dm/s = 35 cm/s, beacause 1 dm = 10 cm, so you calculate 3.5 times 10

→ 3,5 * 10 = 35

35 cm/s = 13,78 in/s, because 1 in = 2,54 cm, so you calculate 35 divided by 2,54 → 35 : 2,45 = 13,78

13,78 in/s = 1,15 ft/s, because 1 ft = 12 in, so you calculate 13,78 divided by 12

→ 13,78 : 12 = 1,15

1,15 ft/s = 0,0002174 mile/s, becaus 1 mile = 5280 ft, so you calculate 1,15 divided by 5280 → 1,15 : 5280 = 0,0002174

Then you convert the mile/s into mile/h:

1 s = 1 / 3600 h

0,0002174 mile/s = 0,0002174 mile : 1/3600 h = 0,0002174 * 3600 mile/h

→ 0,783 mile/h

There will be two atoms of hydrogen and one atom of oxygen produced by the electrolysis of water.

Electrolysis refers to the decomposition of a substance by the passage of direct current through it. When direct current is passed into water, hydrogen and oxygen atoms are produced.

Since water contains hydrogen and oxygen in a ratio of 2:1, the electrolysis of water produces two atoms of hydrogen and one atom of oxygen.

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INFORMATION:

We know that:

- sodium and oxygen react to produce Sodium Oxide

-

Answer:

1=B

2=A

3=A

Explanation:

Any subsatance with a ph of less than 7 is acidic.

Bases measure over 7

   so i have to discuss how forlifts are related to actions in the cell. ok easy Answer: Forklifts collect material (protein) and dump it in storage areas. ... A Cytoplasm is like a Fork Lift because they both transport particles or substances around the factory or the Animal. Therefore, forklift and cytoplasm share this analogy of collecting materials and dumping it elsewhere.

Forklift functionality can be related to cellular functions and organelles.

Cells are defined as the fundamental membrane-bound entity that houses the essential molecules of life and is the building block of all living things. There are many billions of cells in a human body. They give the body structure, absorb nutrients from meals, turn those nutrients into energy, and perform certain tasks.

Protein-containing material is gathered by forklifts and dumped in storage spaces. A cytoplasm is comparable to a forklift in that they both move materials about a factory or an animal. Therefore, this parallel of gathering materials and dumping them somewhere else applies to both forklifts and cytoplasm.

Thus, forklift functionality can be related to cellular functions and organelles.

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Answer:

False

Explanation:

It occurs when two waves meet while traveling along the same medium.

Answer:

Number of energy levels that the element has.

Explanation:

The period number (n) is the outer energy level that is occupied by electrons. The period number that an element is in, is the number of energy levels that the element has.

The kinetic energy of the electron be, in j is 4.1766 × 10⁴⁹.

Kinetic energy is the power an object has because of its motion. If we want to boost up an object, then we must follow a force. making use of force requires us to do paintings. After work has been accomplished, energy has been transferred to the object, and the object might be moving with a new consistent speed.

Calculation:-

wavelength = 189.1 nm

                   = 189.1 × 10⁻⁹ m

c = λf

f  =  189.1 × 10⁻⁹ m / 3 × 10⁸

   = 63.033  × ⁻ ¹⁷

kinetic energy = hf

                         = 6.626 × 10⁻³⁴ ×  63.033  × ⁻ ¹⁷

                         = 417.66 × 10⁻⁵¹

                          = 4.1766 × 10⁴⁹

The kinetic energy of an item is the electricity that it possesses because of its motion. it is defined because the work needed to boost up a frame of a given mass from relaxation to its stated pace. Having gained this energy for the duration of its acceleration, the frame maintains this kinetic electricity except for its pace changes.

Potential energy saved energy that relies upon the relative position of numerous components of a gadget. A spring has greater potential energy when it is compressed or stretched. A steel ball has extra capability strength raised above the ground than it has after falling to Earth.

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Answer:

28/23

Explanation:

28 : 23

this is written as ,

28/23

u can convert into simplest form but in this question u can't so leave it as it is.

The greatest common factor of 12a3b, 8a2b2, and -20ab3 is 4ab.To find the greatest common factor, we need to look for the largest factor that is common to all three terms. In this case, the largest common factor is 4ab.

To factor out the greatest common factor, we simply divide each term by 4ab and place the result outside a set of parentheses. This gives us 4ab(3a2b - 5b2 + 2a2b - 5ab2). Simplifying the expression inside the parentheses, we get 4ab(3a2b + 2a2b - 5b2 - 5ab2), which can be further simplified to 4ab(3a2 + 2ab - 5b)(a - b). However, none of the answer choices match this exact expression. The closest answer is 4a2b(3a2 + 2ab - 5), which can also be factored out to 4ab(3a2 + 2ab - 5b). Therefore, the correct answer is 4ab(3a2 + 2ab - 5b).

The greatest common factor of 12a³b, 8a²b², and -20ab³ is 4ab. So, the factored expression is 4ab(3a² - 2ab + 5b²). To find the greatest common factor (GCF), we look at the coefficients and variables of each term. For the coefficients 12, 8, and -20, the GCF is 4. For the variables, the GCF is a multiplied by b, as it is the lowest power of each variable present in all terms. Therefore, the GCF is 4ab. Now, we factor out the GCF from each term, 12a³b ÷ 4ab = 3a², 8a²b² ÷ 4ab = -2ab, 20ab³ ÷ 4ab = 5b². Then, we combine these terms back into an expression, which gives us 4ab(3a² - 2ab + 5b²).

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Answer:

A

Explanation:

energy stored in chemical bonds of molecules

Answer:

A. 7

(assuming the water is neutral)

The kinetic energy of one molecule of hydrogen (H2) at 300 K is equal to the product of its mass and the square of its velocity. The mass of one molecule of hydrogen is 2.02 x 10^-23 kg, and the velocity of a molecule of hydrogen at 300 K is 1.93 x 10^3 m/s. Therefore, the kinetic energy of one molecule of hydrogen at 300 K is equal to 2.02 x 10^-23 x (1.93 x 10^3)^2 = 7.4 x 10^-15 J.

To explain this in further detail, kinetic energy is the energy associated with an object in motion. It is calculated by the formula KE = 1/2 mv^2. For an object of mass m and velocity v, the kinetic energy is equal to one half of the product of its mass and the square of its velocity. Therefore, the kinetic energy of an object is directly proportional to the square of its velocity.

In the case of a molecule of hydrogen (H2) at 300 K, its mass is 2.02 x 10^-23 kg and its velocity is 1.93 x 10^3 m/s. Therefore, the kinetic energy of one molecule of hydrogen at 300 K is equal to 2.02 x 10^-23 x (1.93 x 10^3)^2 = 7.4 x 10^-15 J.

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Answer:

The rollercoaster has the lowest kinetic energy at the top of the hill.

The rollercaoster has the highest kinetic energy at the bottom of the hill.

Explanation:

The kinetic energy of any solid body in motion is usually computed using this formula:

K.E = \(\frac{1}{2}mv^2\)

From this, we can see that it varies based on two major parameters - The mass of the moving object and the velocity of the moving object.

We can assume that the mass of the rollercoaster is constant since no one gets off and it does not shrink in its size during the ride.

This means that the variations in the K.E are mainly coming from its velocity.

At the top of the hill, the rollercoaster is moving at its slowest pace. hence, it has the lowest kinetic energy at the top of the hill.

However, at the bottom of the hill, the rollercoaster is moving its fastest, hence it has the highest kinetic energy at the bottom of the hill.

True , A catalyst is a substance that quickens a chemical reaction; therefore, in homogeneous catalysis, the catalyst and reactants are in the same phase. Most of the time, everything will exist as a gas or be contained within a single liquid phase.

The difference between heterogeneous and homogeneous catalysts is that the former are in the same phase as the latter are not.

A single phase is what is meant by the notion of a pure substance or homogenous mixture. There are two or more phases in a heterogeneous mixture. Water and oil do not mix uniformly when combined; instead, two distinct layers are created.

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Answer:

Insoluble substances remain the same when in water.

Explanation:

When a substance is regarded as insoluble, it means that the substance remains the same in water.

Soluble substances usually form one continuous phase with water when they are added to water (eg when salt is added to water).

However, when camphor is added to water, it does not form a single phase with water. It remains the same in the water and maintains a separate phase from the water. Hence camphor is an insoluble substance.

Answer: Solid, liquid, and gas are the three phases of H2O that are listed in order of increasing entropy.

The haphazard motion of water molecules in molecular water gives it the maximum flexibility.

Explanation:

The reaction between magnesium ribbon and dilute hydrochloric acid is a classic example of a single replacement reaction, which can be represented by the following chemical equation:

Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g)

In this reaction, magnesium (Mg) reacts with hydrochloric acid (HCl) to form magnesium chloride (MgCl2) and hydrogen gas (H2).

The rate of this reaction can be altered by changing the concentration of the hydrochloric acid. This is because the rate of a chemical reaction depends on the concentration of the reactants. Specifically, the rate of the reaction is proportional to the concentration of the reactants raised to some power, which is determined by the reaction's rate law.

In this reaction, the rate law can be expressed as:

Rate = k [Mg] [HCl]^x

Where k is the rate constant and x is the order of the reaction with respect to hydrochloric acid. The order of the reaction with respect to magnesium is one, since the concentration of magnesium does not change during the reaction.

When the concentration of hydrochloric acid is increased, the rate of the reaction increases because there are more hydrochloric acid molecules available to collide with magnesium atoms and react. This means that the value of x is greater than zero and the reaction is dependent on the concentration of hydrochloric acid.

Conversely, when the concentration of hydrochloric acid is decreased, the rate of the reaction decreases because there are fewer hydrochloric acid molecules available to react with magnesium. This means that the value of x is less than one and the reaction is not entirely dependent on the concentration of hydrochloric acid.

Common lab acids include:

Hydrochloric acid, Sulfuric acid, Nitric acid.

There are many laboratory acids, some of the most common ones include:

Hydrochloric acid (HCl)

Sulfuric acid (H2SO4)

Nitric acid (HNO3)

Acetic acid (CH3COOH)

Hydrofluoric acid (HF)

Phosphoric acid (H3PO4)

Citric acid (C6H8O7)

Hydrobromic acid (HBr)

Perchloric acid (HClO4)

Carbonic acid (H2CO3)

These laboratory acids are commonly used in various chemical reactions and experiments, and they can be dangerous if not handled properly. It is important to always wear appropriate safety equipment and follow proper laboratory procedures when working with these chemicals.

These laboratory acids can be hazardous if not handled carefully and are frequently employed in a variety of chemical reactions and investigations. When working with these compounds, it's crucial to wear the required safety gear and adhere to the correct lab protocols.

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NaCI is ionic and empirical