What is the volume of 70. 0 g of fluorine gas at STP?

Answer:  1: Cathode rays travel in a straight line and can cast sharp shadows. Property 2: Cathode rays are negatively charged. Property 3: Electric field and magnetic field deflect cathode rays.

Explanation:

The term "atomic theory" is used instead of "atomic hypothesis" because it signifies the evolution and acceptance of the concept over time.

While Democritus initially proposed the idea of atoms in 400 BCE, it was merely a hypothesis without substantial experimental evidence. Over centuries, scientific investigations and advancements led to a deeper understanding of atomic structure and behavior.

The term "atomic theory" acknowledges that the concept of atoms has undergone refinement and modification based on experimental evidence and theoretical developments.

It recognizes that the understanding of atoms has evolved from a speculative hypothesis to a well-established scientific theory supported by extensive experimental observations, mathematical models, and empirical data.

The term "theory" conveys the comprehensive and validated nature of our understanding of atoms, encompassing their complex structures and behavior.

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4LiBr + Co(SO₄)₂ ----> 2Li₂SO₄ + CoBr₄ is the balanced equation.

First write the complete equation

LiBr + Co(SO₄)₂ ----> Li₂SO₄ + CoBr₄

Now balance the given equation

LiBr + Co(SO₄)₂ ----> Li₂SO₄ + CoBr₄

Reactant Side Product side

Li= 1 Li = 2

Br = 1 S = 1

Co = 1 Co = 1

S = 2 S = 1

O = 8 O = 4

We can see that there are 8 oxygen atom in yhe Reactant side and 4 in the product side. So multiply by 2 in the product side to balance the Oxygen atoms.

4LiBr + Co(SO₄)₂ ----> 2Li₂SO₄ + CoBr₄

We can see that the given equation is now balanced.

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QUESTION: Write the complete equation and also balanced the equation.

_LiBr + _ Co(SO₄)₂ --> _ + _

Answer:

The answer is "Option A"

Explanation:

Given:

Moles in \(NaOH = 0.50\)

The equation formula for \(NaOH\)and\(H_2SO_4\) reactions as follows:

\(2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\)

The reaction's stoichiometry:

If 2 moles of \(NaOH\) react with 1 \(H_2SO_4\) mole

Thus 0.50 \(NaOH\) moles react with =  \(\frac{1}{2} \times 0.50\) \(H_2SO_4\) moles

So, the final value is= 0.25

Answer:

196J, but C. at 200 J comes close.

Explanation:

Potential energy due to gravity is given by:

PEgrav = mass • g • height

where g is the acceleration due to gravity.  We'll use 9.8 N/kg (on Earth).

PEgrav = mass • g • height

PEgrav = (2 kg) • (9.8 N/kg) • (10 m)

PEgrav = 196 N*m

1 N*m = 1 Joule

PEgrav = 196 J

C. at 200 J comes close.  The solution probably used a value of g equal to 10 N/kg)

Answer:

20 J

Explanation:

1) C6H12 (g) + O2 (g) --> H2O (g) + CO2 (g)

To balance the chemical reaction you need to have the same amount of atoms of each element on both the reagents and products side.

C6H12 (g) + O2 (g) --> H2O (g) + CO2 (g)

Reactant:

C - 6

H - 12

O - 2

Product:

C - 1

H - 2

O - 2

Now let's equalize the atoms on the products and reagents side:

C6H12 (g) + 9 O2 (g) --> 6 H2O (g) + 6 CO2 (g)

Reactant:

C - 6

H - 12

O - 18

Product:

C - 6

H - 12

O - (6x1) + (6x2) = 18

chemical equation balanced: C6H12 (g) + 9 O2 (g) --> 6 H2O (g) + 6 CO2 (g)

2) C6H12 (g) + 9 O2 (g) --> 6 H2O (g) + 6 CO2 (g) this is a complete combustion reaction, because it has a fuel reacting with oxygen that forms water and carbon dioxide.

class: combustion reaction.

3) B) To answer you need to use the proportion of the chemical equation:

9 moles of O2 = 6 moles of CO2

3 moles of Oxygen = x moles of CO2

9x = 3 × 6

x = 2 moles of CO2

Answer: n= 0.045 mol

Explanation: amount of substance in moles is n= cV= 0.30 mol/l· 0.150 l

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.

Answer:  1 mole of stacked pennies would reach a height of 5.69x10^17 miles.

Explanation:   The U.S. penny has a thinkness of 1.52mm.  One mole of pennies would have:

(1 mole pennies)(6.02x10^23 pennies/mole)*(1.52mm/penny) = 9.15x10^23 mm for 1 mole of pennies.  One mile = 1.609x10^6 mm.

(9.15x10^23 mm)/( 1.609x10^6 mm/mile) = 5.69x10^17 miles for 1 mole of pennies.  

That would reach Alpha Centauri (5.69x10^17 miles/2.6 x 10^13 miles)= 2.19x10^4 times.  

There is a coin shortage in the US, so good luck.  Send me your spare pennies.

[Note:  I did this quickly, so please check the work.  A mole is indeed a big number, but . . .]

Answer:

The answer is

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 40 mL

density = 0.80 g/mL

The mass is

mass = 40 × 0.8

We have the final answer as

Hope this helps you

Highest boiling point compound is CBr4. The compound which has lowest freezing point is F2. The compound which has lowest vapor pressure is CH3CH2OH. The compound which has greatest viscosity is H2O2.

The boiling point of a substance is directly related to the strength of the intermolecular forces between the particles of the substance. The compound with the highest boiling point in this group is CBr4 because of its stronger London dispersion forces.
The freezing point of a substance is directly related to the strength of the intermolecular forces between the particles of the substance. A covalent compound has weak van der Waal forces between its particles, and the smaller the particle, the weaker the van der Waal force. F2 has the smallest particle size and therefore the lowest freezing point.c. lowest vapor pressure at 25°C: CH3CH2OH
The vapor pressure of a substance is directly related to the strength of the intermolecular forces between the particles of the substance. The compound with the lowest vapor pressure at 25°C. is CH3CH2OH.

The compound with greatest viscosity: H2O2. Viscosity is a measure of a liquid's resistance to flow. The greater the viscosity, the greater the resistance to flow.
Enthalpy of vaporization is the amount of energy required to vaporize a unit quantity of a substance. The enthalpy of vaporization is related to the strength of the intermolecular forces between the particles of the substance. The compound with smallest enthalpy of fusion is I2.
The enthalpy of fusion is the amount of energy required to melt a unit quantity of a substance. I2 has the weakest intermolecular forces and therefore the smallest enthalpy of fusion.

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The symbol for atomic sulfur and molecular sulfur is different. The symbol for atomic sulfur is S and the symbol for molecule sulfur is S₈.

The symbol of an element or atom is just the representation with few alphabets with no digit.

example

Symbol for Oxygen is O

Symbol for Nitrogen is N

Symbol for sulfur is S

However in case of molecule we know that molecule is the combination of atoms. In sulfur molecule 8 sulfur atom is present so we represent the molecule as  S₈.

Thus the elemental form of sulfur is an eight atomic molecule

The forms is represented as S₈.

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The thermal decomposition of sodium bicarbonate involves breaking down the compound into its component parts, including Na2CO3, H2O, and CO2.

What is Thermal Decomposition?

Thermal decomposition is a chemical reaction in which a substance is broken down into simpler substances or elements by heating it. This process is typically carried out in the absence of air or oxygen, which can cause the substance to burn or react with other substances.

The balanced chemical equation that best represents the thermal decomposition of sodium bicarbonate is 2 NaHCO3 → Na2CO3 + H2O + CO2.

Evidence: According to the data tables, 4.00 g of sodium bicarbonate (NaHCO3) was heated, resulting in a product with a mass of 2.30 g. Stoichiometry calculations were then performed to determine the expected masses of the possible products, assuming they were formed in stoichiometric quantities based on different balanced chemical equations. The expected mass of Na2CO3 for the balanced chemical equation 2 NaHCO3 → Na2CO3 + H2O + CO2 was calculated to be 1.90 g, which is the closest match to the actual measured mass of the product.

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The molar mass of the gas, given that 0.250 g of the gas is collected at 150.0 °C and 720 mmHg is 108.7 g/mol

First, we shall obtain the mole of the gas collected. This is shown below:

PV = nRT

0.947 × 0.085 = n × 0.0821 × 423

Divide both sides by (0.0821 × 423)

n = (0.947 × 0.085) / (0.0821 × 423)

n = 0.0023 mole

Finally, we shall obtain the molar mass of the gas. This is shown below:

Molar mass = mass / mole

Molar mass of gas = 0.250 / 0.0023

Molar mass of gas = 108.7 g/mol

Thus, the molar mass of the gas collected is 108.7 g/mol

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Answer:

Oil: 379

Natural gas: 23%

Coal: Not provided in the given information.

Explanation:

To determine the total percent of energy that came from fuels emitting greenhouse gases, we need to consider the energy sources mentioned in the chart. The energy sources that emit greenhouse gases are oil, natural gas, and coal.

According to the chart, the percentages of energy from these sources are as follows:

Oil: 379

Natural gas: 23%

Coal: Not provided in the given information.

However, since the information about the percentage of energy from coal is missing, we cannot accurately calculate the total percent of energy that came from greenhouse gas-emitting fuels. Without the data for coal, we cannot determine the exact value for the total percentage.

Please note that for an accurate calculation, the percentage of energy from coal would need to be provided.

Answer:

the speed of light travels much faster than the speed of sound.

The balanced chemical equation is:

0.5C7H16 + O2 → 0.5CO2 + H2O

For balancing the chemical equation C7H16 + O2 → CO2 + H2O, we can use linear algebraic techniques. We need to determine the coefficients that balance the number of atoms on both sides of the equation.

Let's denote the coefficients for C7H16, O2, CO2, and H2O as a, b, c, and d, respectively.

The balanced chemical equation can be written as:

aC7H16 + bO2 → cCO2 + dH2O

To balance the carbon (C) atoms, we have:

7a = c (Equation 1)

To balance the hydrogen (H) atoms, we have:

16a = 2d (Equation 2)

To balance the oxygen (O) atoms, we have:

2b = 2c + d (Equation 3)

We have three equations (Equations 1, 2, and 3) and four unknowns (a, b, c, d). To solve this system of equations, we can write it in matrix form and find the solution using linear algebraic techniques.

The augmented matrix for the system of equations is:

[ 7 0 -1 0 | 0 ]

[ 0 0 0 -2 | 0 ]

[ 0 -2 2 -1 | 0 ]

By performing row operations to row-reduce the augmented matrix, we can obtain the solution:

[ 1 0 -0.5 0 ]

[ 0 1 -1 -0.5 ]

[ 0 0 0 0 ]

The solution to the system of equations is:

a = 0.5

b = 1

c = 0.5

d = 1

Putting the values of a,b,c, and d we get the balanced chemical equation as:

0.5C7H16 + O2 → 0.5CO2 + H2O

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your answer will be Carbon

I just got help from a friend!

Answer:

your answer is (The fluid that passes through filter paper during filtration)

‘Chromatography’ is an analytical technique commonly used for separating a mixture of chemical substances into its individual components, so that the individual components can be thoroughly analyzed. There are many types of chromatography e.g., liquid chromatography, gas chromatography, ion-exchange chromatography, affinity chromatography, but all of these employ the same basic principles.

Chromatography is a separation technique that every organic chemist and biochemist is familiar with. I, myself, being an organic chemist, have routinely carried out chromatographic separations of a variety of mixture of compounds in the lab. In fact, I was leafing through my research slides and came across a pictorial representation of an actual chromatographic separation that I had carried out in the lab. I guess that picture would be a good starting point for this tutorial!

Let me first explain what I was trying to do here. I had two reactants ‘A’ and ‘B’. I let them react with each other, under certain reaction conditions, to form a product ‘C’. After the reaction was complete, I ended up with a reaction mixture that contained unreacted A, unreacted B and my desired product C. Now my task was to separate out A, B and C to isolate and analyze pure product C.

To obtain a more reliable or precise value for the optimum temperature in an experiment, several changes can be made. Here are some suggestions: Replicate the experiment, Increase sample size, Use a narrower temperature range, Utilize more precise temperature control etc

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Answer:

3ml

Explanation:

10ml-7ml=3ml

Answer:

C. Its viscosity decreases with increasing temperature

Explanation:

Answer: Gabbro is a type of intrusive rock while basalt is a type of extrusive rock. The main difference between gabbro and basalt is that gabbro forms deep beneath the Earth's surface, whereas basalt forms at or very near the surface of the planet.

Explanation: Hope this helps! :)

Answer:

NO

Explanation:

To maintain electric neutrality, the atom has to have equal number of electrons and protons. Therefore, it needs to have 6 electrons to be neutral.

The valence electrons are located in the outermost orbitals of an atom.

The valence electrons of an atom are located in its outermost orbitals, also known as valence shells. These orbitals, which vary in size and energy depending on the atom, hold the electrons that are most likely to be involved in chemical reactions. Valence electrons are responsible for most of the bonding interactions between atoms, making them the most important electrons in a chemical reaction. In general, the number of valence electrons corresponds to the number of bonds an atom can form. For example, carbon, which has four valence electrons, can form four covalent bonds. As such, the valence electrons of an atom have a major impact on its chemical properties.

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The condensed structural formula for the product of the reaction of 2-butene with water and a strong acid catalyst is shown below ,

First write the condensed structural formula of 2-butene and indicate that it reacts with water. Then write the condensed structural formula of 2-butanol after the reaction arrow to indicate that it is the product. Finally, write the formula for the catalyst above the arrow.

The acid first attack at double bonded carbon of 2-butene and produce stable carbocation then water molecule attack on carbocation followed by deprotonation .

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Answer:

Volume

Explanation:

Volume is the quantity of three-dimensional space enclosed by a closed surface, for example, the space that a substance (solid, liquid, gas, or plasma) or 3D shape occupies or contains.[1] Volume is often quantified numerically using the SI derived unit, the cubic metre. The volume of a container is generally understood to be the capacity of the container; i.e., the amount of fluid (gas or liquid) that the container could hold, rather than the amount of space the container itself displaces. Three dimensional mathematical shapes are also assigned volumes. Volumes of some simple shapes, such as regular, straight-edged, and circular shapes can be easily calculated using arithmetic formulas. Volumes of complicated shapes can be calculated with integral calculus if a formula exists for the shape's boundary. One-dimensional figures (such as lines) and two-dimensional shapes (such as squares) are assigned zero volume in the three-dimensional space.

The volume of a solid (whether regularly or irregularly shaped) can be determined by fluid displacement. Displacement of liquid can also be used to determine the volume of a gas. The combined volume of two substances is usually greater than the volume of just one of the substances. However, sometimes one substance dissolves in the other and in such cases the combined volume is not additive.[2]

In differential geometry, volume is expressed by means of the volume form, and is an important global Riemannian invariant. In thermodynamics, volume is a fundamental parameter, and is a conjugate variable to pressure.

To determine the pH of a solution using a pH indicator paper, you need a color chart or a color scale that corresponds to different pH values.

This color chart or scale is used to compare the color of the pH indicator paper after it has been immersed in the solution. The pH indicator paper is impregnated with a universal pH indicator, which is a chemical compound that changes color depending on the acidity or alkalinity of the solution.

The indicator undergoes a chemical reaction with the hydrogen ions (H+) or hydroxide ions (OH-) present in the solution, resulting in a color change.

By comparing the color of the pH indicator paper with the color chart or scale, you can determine the approximate pH of the solution. The color chart usually provides a range of colors corresponding to different pH values, allowing you to match the observed color to the nearest pH value.

In the hypothesis mentioned, the aim is to calibrate a cabbage pH indicator using the pH values obtained from a universal pH indicator. Therefore, in addition to the pH indicator paper and color chart, you would also need a range of solutions with known pH values to establish a calibration curve specific to the cabbage pH indicator.

In summary, to determine the pH of a solution using a pH indicator paper, you need a color chart or scale that correlates the observed color of the pH indicator paper with different pH values. This chart or scale serves as a reference for interpreting the color change and determining the pH of the solution.

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Answer: COLOR KEY

Explanation: CS

Explanation:

Actually the total abundant of isotopes of any element in the world must sum up to 100 percent. So we initially know that 12c is 98.9 percent. Therefore the remaining of the remains of 100 must be 12

3c = 100%- 98.9

13c= 1.1%