Select the ion.

a) NO2
b)H2SO4
c) Al+3 ...?

Answer:

B: bicep curl

Explanation:

In a bicep curl the muscle in the biceps contracts or shortens creating a tension on the muscle. During concentric contraction a lot of force is generated that allows the movement of an object such as a dumbbell.  As the dumbbell is moved to the shoulder the bicep bulges or contracts. Concentric contraction is used for muscular hypertrophy.

The percent composition of calcium acetate (Ca(C2H3O2)2) is 25%, 7%, 0.6% and 10.12%.

To determine the percent composition of calcium acetate, we would have to calculate the content of the compound. This would mean determining the percent presence of calcium, carbon, hydrogen nd oxygen. This can be done as follows:

First, determine molar mass

% = molar mass of elements / total molecular molar mass) x100

M (Ca(C2H3O2)2) = 2*(12*2 +3*1+16*2) + 40=158

Now determine percent composition

%Ca= 40/158x 100

= 0.25x 100

= 25%

%C = 12/158  x 100

= 0.07x 100=7%

%H= 1/158x 100=

0.006x 100

=0.6%

%O=16/158x 100

= 0.101x 100=  10.12%

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Answer: Option (b) is the correct answer.

Explanation:

A chemical reaction is defined as one which tends to bring change in composition of reactants leading to the formation of new substances or products.

So, when baking soda and vinegar come in contact with each other then they chemically combine to each other. This is because a gas is formed upon their reaction which shows it is a chemical reaction.

Thus, we can conclude that vinegar and baking soda react to form a new gaseous substance.

Answer:

have their own function

Explanation:

Specialized cells are cells that have a specific function in the body of a multicellular living being. These cells can function to form tissues, organs, muscles, bones and other body structures. An example that can be used to explain the concept of specialized cells is stem cells. These cells are undifferentiated cells, but they have a great capacity for specialization. Once stem cells specialize, they can form new tissues and other body structures.

The answer is solution cap a.. n....s

Answer : The correct option is, only alpha particles.

Explanation :

Penetration power : It is defined as the movement of the rays or the particles through the object.  As more the energy of a particle, the more will be the penetrating power.

The ascending or increasing order of the penetration power of the particles will be :

Alpha rays < Beta rays < Gamma rays

The penetrating power of the particles alpha, beta and gamma rays varies differently.

Hence, the particles can be stopped by human skin is only alpha particles.

Lewis dot structures, also known as electron dot structures, are schematics that show the interatomic chemical bonds in a molecule. Additionally, they show how many lone pairs there are overall in each of the atoms that make up the molecule.

The electrical structures of the elements, especially the electron pairings, are reflected in the Lewis dot structures. Lewis structures can be viewed as "electron bookkeeping" and are a helpful approach to condensing some bonding-related information. Each dot in a Lewis dot structure corresponds to 1 electron.

The electrons that do not belong to the outermost shell are omitted while designing Lewis dot structures and only the valence electrons are taken into account.

Here the Lewis structure of AlH₄⁻ is:

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The correct statement is that best describes the relationship between volume of gas and mole is [tex]\boxed{{\text{The volume of gas is directly proportional to amount (moles)of gas }}}[/tex].

Further explanation:

Ideal gas:

An ideal gas contains a large number of randomly moving particles that are supposed to have perfectly elastic collisions among themselves. It is just a theoretical concept, and practically no such gas exists. But gases tend to behave almost ideally at a higher temperature and lower pressure.

The expression for the ideal gas equation of gas is as follows:

[tex]{\text{PV}}={\text{nRT}}[/tex]                                           ...... (1)

Here,

P is the pressure of the gas.

V is the volume of gas.

n denotes the number of moles of gas.

R is the gas constant.

T is the temperature of gas.

Rearrange equation (1) for V and we get,

[tex]{\text{V}}=\dfrac{{{\text{nRT}}}}{{\text{P}}}[/tex]                  ...... (2)

When the pressure (P) and temperature (T) of gas are constant and gas constant is also a consant. So the equation (2) can be modified so that all the constant can be replaced by K.

Substitute K for [tex]\dfrac{{{\text{RT}}}}{{\text{P}}}[/tex] in equation (2) and we get,  

[tex]{\text{V}}={\text{nK}}[/tex]                                                   ...... (3)

As K is constant in equation (3) it can also be written as:

[tex]{\text{V}}\propto{\text{n}}[/tex]                                          ...... (4)

According to equation (4), volume of gas is directly proportional to number of moles of gas at constant temperature and pressure.

Avogadro’s law:

Avogadro’s law is an experimental gas law that relates the volume of gas and number of moles of gas. It states that volume of an ideal gas is directly proportional to number of moles of an ideal gas at constant temperature and pressure.

The given plot also shows that volume of gas and number of moles at constant temperature and pressure is straight line. Therefore volume of gas increases with increase in number of moles of gas.

Hence, the correct statement is the volume of gas is directly proportional to amount (moles) of gas.

Learn more:

1. How many moles of nitrogen are present: https://brainly.com/question/2385746.

2.Calculate number of moles of Cl atom: https://brainly.com/question/1537871.

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Ideal gas equation

Keywords: ideal gas, pressure, volume, absolute temperature, equation of state, hypothetical, universal gas constant, moles of gas, initial, final, P, R, T, V, n.

Answer:

A. When the forces are weaker, a substance will have higher volatility.

Explanation:

edge 2020

Two examples of precipitation reactions that form white precipitates are the combination of calcium chloride with silver nitrate to form silver chloride, and the reaction of lead (II) nitrate with potassium iodide to form lead iodide (though not white).

In the context of precipitation reactions, two examples that result in a white precipitate are:

Lead (II) nitrate solution reacts with a potassium iodide solution forming a yellow precipitate of lead iodide (although the precipitate is not white, it helps illustrate the concept of precipitation reactions).

When a solution of calcium chloride is mixed with a silver nitrate solution, a white precipitate of silver chloride is formed. The potential reaction would be:

CaCl2(aq) + 2AgNO3(aq) → 2AgCl(s) + Ca(NO3)2(aq)

These reactions involve combining two soluble ionic compounds that yield an insoluble compound, forming a precipitate that is visible at the bottom of the reaction vessel. A commonality among precipitation reactions is that they involve solubility rules to predict which combination of ions will produce an insoluble salt in the double-displacement reactions.

Answer:Sequoia,Bristle pine

Explanation:

fourteeeeeeeeeeeeeen

Answer: Total number of electrons that can be occupied in 5f-sub-level are 14.

Explanation: f-sub-level has in total 7 orbitals.

Each orbital can hold 2 electrons, both in opposite directions.

As, f-sub-level has in total of 7 orbitals, so the total number of electrons that can be held in 5f-sub-level is ( 7 × 2) = 14 electrons.

A. Nucleotide is the correct answer

A volumetric pipette

Answer : The correct option is, a volumetric pipette

Explanation :

Volumetric pipettes : It is a type of instrument that are used in volumetric analysis. It is used for the exact smaller volume of a sample solution  or a reagent.

In the volumetric pipette, the upper part of the pipette has a ring like mark that marks its calibrated volume.

Burette : It is used in the titration for the known concentration of the solution.

Beaker : It is not used in the titration because it is not accurate for the measurement.

Erlenmeyer flask : It is a conical flask which is also used in the titration.

Hence, a volumetric pipette instrument is most often used to measure acid volume before a titration begins.

Final answer:

The SI unit for current is the ampere (amps), which measures the flow of electric charge as one Coulomb per second.

Explanation:

The SI unit for current is the ampere, often shortened to amps. An ampere is defined as one Coulomb per second (1 A = 1 C/s), which represents the flow of electric charge. It is a fundamental unit in the SI system, and is crucial in the study of electricity and magnetism. Other units such as volts, joules, and ohms, are related to different aspects of electrical measurements. Volts measure electric potential difference, joules are a unit for energy, and ohms are the unit of electrical resistance.

4) The answer is: Chemical reaction rates vary with the conditions of the reaction, but nuclear decay rates do not.

Differences between nuclear and chemical reactions:

1) The electrons of an atom participates in a chemical reaction and protons in nuclear reaction.

2) Chemical reactions involve the rearrangement of electrons, because there is transfer, loss, gain and sharing of electrons in chemical reactions.

3) Nuclear reactions can produce new elements, because number of protons and neutrons is changed, chemical reactions donot produce new element.

4) Chemical reactions require heat or an input of energy to occur, this is activation energy.

5) Isotopes of the same element behave differently in a nuclear reaction, because isotopes have different number of neutrons, so products of a nuclear reaction is different.

6) The answer is: nuclear change.

Transmutation is a process that involves a change in the nucleus of an atom. It can be natural or artificial.  

For example: 14/7 N + 4/2 He --> 17/8 O + 1/1 H.  

This example is the first artificial nuclear transmutation described by Rutherford in 1919.  

Artificial transmutation can be expressed by nuclear reaction:  

Target Nuclide + Bombardment Particle → New Nuclide + Ejected Particle.  

The combined mass of oxygen and mercury obtained from the thermal decomposition of 20g of mercury(II) oxide would also be 20g. The exact division between oxygen and mercury would depend on the stoichiometry of the reaction.

The subject here is the thermal decomposition of mercury(II) oxide (HgO). When this compound is heated, it decomposes into mercury and oxygen. The mass principle in chemistry, also known as the Conservation of Mass, states that the combined mass of the products (oxygen and mercury in this case) should be equal to the mass of the reactant (mercury oxide). Therefore, if you heat 20g of mercury(II) oxide, you would obtain a combined mass of 20g of oxygen and mercury. The exact mass of oxygen and mercury would depend on the atomic mass and stoichiometry of the decomposition reaction. For example, if the reaction were 2HgO --> 2Hg + O2, you would get twice as much mercury mass as oxygen, due to the nature of the balanced equation.

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Answer:

number of moles = 0.08175 moles

Explanation:

To solve this question, we will use the ideal gas law:

PV = nRT

where:

P is the pressure = 1 atm

V is the volume of the gas = 2 liters

n is the number of moles we want to find

R is the general gas constant = 0.0821 L-atm/mol-K

T is the temperature = 25°C = 25 + 273 = 298°K

Now, substitute with the givens in the equation to get n as follows:

PV = nRT

1 * 2 = n * 0.0821* 298

n = [tex] \frac{1*2}{0.0821 * 298} = 0.08175 [/tex] moles

Hope this helps :)

[tex]\boxed{{\text{0}}{\text{.06 mol}}}[/tex]  of nitrogen are contained in a 2 L cola bottle at atmospheric pressure and room temperature.

Further Explanation:

An ideal gas contains a large number of randomly moving particles that are supposed to have perfectly elastic collisions among themselves. It is just a theoretical concept, and practically no such gas exists. But gases tend to behave almost ideally at a higher temperature and lower pressure.

Ideal gas law is considered as the equation of state for any hypothetical gas. The expression for the ideal gas equation is as follows:

[tex]{\text{PV}} = {\text{nRT}}[/tex]                        ......(1)

Here, P is the pressure of nitrogen.

V is the volume of nitrogen.

T is the absolute temperature of nitrogen.

n is the number of moles of nitrogen.

R is the universal gas constant.

Rearrange equation (1) to calculate the number of moles of nitrogen.

[tex]{\text{n}} = \frac{{{\text{PV}}}}{{{\text{RT}}}}[/tex]            ......(2)

Firstly, the temperature is to be converted into K. The conversion factor for this is,

[tex]{\text{0 }}^\circ {\text{C}} = {\text{273 K}}[/tex]

So the temperature of nitrogen is calculated as follows:

[tex]\begin{aligned}{\text{Temperature}}\left( {\text{K}}\right)&=\left( {25 + 273} \right)\;{\text{K}}\\&=298\;{\text{K}}\\\end{aligned}[/tex]

The pressure of nitrogen is 1 atm.

The volume of nitrogen is 2 L.

The temperature of nitrogen is 298 K.

Universal gas constant is 0.0821 L atm/K mol.

Substitute these values in equation (2).

[tex]\begin{aligned}{\text{n}}&=\frac{{\left({{\text{1 atm}}}\right)\left({{\text{2 L}}}\right)}}{{\left({{\text{0}}{\text{.0821 L atm/K mol}}}\right)\left({{\text{298 K}}} \right)}}\\&={\text{0}}{\text{.0817 mol}}\\&\approx {\text{0}}{\text{.08 mol}}\\\end{aligned}[/tex]

As we know, air contains 78 % of nitrogen. So the moles of nitrogen are calculated as follows:

[tex]\begin{aligned}{\text{Number of moles of }}{{\text{N}}_2} &=\left({{\text{0}}{\text{.08 mol}}}\right)\left({\frac{{{\text{78}}\;{\text{\% }}}}{{{\text{100}}\,{\text{\% }}}}}\right)\\&={\text{0}}{\text{.0624 mol}}\\&\approx {\mathbf{0}}{\mathbf{.06 mol}}\\\end{aligned}[/tex]

Learn more:

1. Which statement is true for Boyle’s law: https://brainly.com/question/1158880

2. Calculation of volume of gas: https://brainly.com/question/3636135

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Ideal gas equation

Keywords: ideal gas, pressure, volume, absolute temperature, equation of state, hypothetical, universal gas constant, moles of gas, initial, final, moles of nitrogen, 0.08 mol, 0.06 mol, 298 K, 273 K, P, V, n, R, T, room temperature, atmospheric pressure.

The statement is false as gas particles are separated by large distances, move randomly, have no definite shape or volume, and can expand to fill their container.

The statement is FALSE. In the gas state, the particles are not packed closely together; rather, they are separated by large distances compared to their sizes. Gas particles have enough energy to overcome intermolecular interactions, allowing them to move about randomly and occupy all the accessible volume within a container. These particles are in constant motion, colliding elastically with each other and the walls of the container, and this motion becomes more rapid as the temperature increases. Gases have no definite shape or volume, and thus expand to fill the container they are in, contrasting the behavior of solids and liquids, where particles are more closely packed together.