ithium reacts with water to form lithium hydroxide. what mass of lithium is required to produce 12 g of lithium hydroxide?

Answer:

24

Explanation:

The number of protons in the atom of the neutral element will also be 24.

Protons are the positively charged particles in an atom.

Electrons are the negatively charged particles

Neutrons do not carry any charges at all

Now, in a neutral atom, the charge is balanced and the number of protons and electrons are the same in the atom.

So, since we have been given that the atom has 24 electrons, the number of protons will be 24.

The question requires us to calculate the energy, in joules (J), necessary to heat 83.5g of water from 26.7 °C to 75°C.

The heat energy (Q) can be calculated from the mass of the sample (m), its specific heat capacity of the substance (C) and temperature variation (ΔT), as given by the following equation:

Since the question did not provide a value for the specific heat capacity of water, we'll adopt the value 4.182 J/g.°C. Applying the values provided by the question, we can calculate the heat energy as:

Therefore, the heat energy necessary to heat the amount of water given grom 26.7 to 75°C is 1.69 x 10^4 J (or 16900 J).

We need to add 6.3 × 10-5 moles of Ca(NO3)2 to 1 L of 0.100 M HF solution to begin precipitation of CaF2 (s).

First, we need to write a balanced chemical equation for the precipitation reaction.Ca(NO3)2(aq) + 2HF(aq) → CaF2(s) + 2HNO3(aq)Now, we need to write the expression for Ksp.Ksp = [Ca2+][F-]2We can express [Ca2+] and [F-] in terms of the initial concentration and the amount of Ca(NO3)2 added.[Ca2+] = x (moles of Ca(NO3)2 added)/1 L of solution[F-] = 2x (moles of Ca(NO3)2 added)/1 L of solution. At equilibrium, the Ksp expression becomes Ksp = x * (2x)2 = 4.0 × 10-11Solving for x, we getx = [Ca2+] = 6.3 × 10-5 MSo, we need to add 6.3 × 10-5 moles of Ca(NO3)2 to 1 L of 0.100 M HF solution to begin precipitation of CaF2 (s).

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Answer:

The valency of sulphur in SO2 is 4.

Hope this helps..

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Answer:

True

Explanation:

course hero verified.

Answer:

Explanation:

electrons have a minus charge. There are more of them than protons.

8 - 11 = -3 is the charge of the ion. (at atom that has a charge is an ion).

The volume of EDTA will increase since it binds with Pb²⁺ and calcium ions, where the number of moles of Zn calculated will increases and thus, error occurs in the determination of concentration.

EDTA is ethylene diamine tetra acetic acid. It is a hexadentate ligand that easily binds with metals such as calcium, ions, zinc, cobalt, nickel etc. Therefore, EDTA is used as the complexing agent in complexometric titration.

EDTA forms chelate complex with metals which leads to extra stability for the metal complexes. In complexometric titrations, EDTA first binds to the indicator and then starts to bind with the metal preferentially where the indicator is released giving the color change.

EDTA can selectively bind with some metal compared with other metals. If the water used in the Zn - analysis contains lead and calcium, EDTA preferentially binds with calcium and thus more volume of EDTA will be consumed, leading to erroneous calculation in the number of moles of Zn.

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Okay, let's solve this step-by-step without using quadratics:

1) The equilibrium constant Kc = 0.36 means the equilibrium lies to the left. So there will be more N2O4 than NO2 at equilibrium.

2) The initial concentration of N2O4 is 0.1 mol dm^-3. Let's call this [N2O4]initial.

3) At equilibrium, the concentrations of N2O4 and NO2 will be [N2O4]equil and [NO2]equil respectively.

4) We know the equilibrium constant expression for this reaction is:

Kc = ([NO2]equil)^2 / [N2O4]equil

5) Setting this equal to 0.36 and plugging in 0.1 for [N2O4]initial, we get:

0.36 = ([NO2]equil)^2 / (0.1 - [NO2]equil)

6) Simplifying, we get:

0.036 = [NO2]equil^2

7) Taking the square root of both sides, we get:

[NO2]equil = 0.06 mol dm^-3

So the equilibrium concentration of NO2 is 0.06 mol dm^-3.

Let me know if you have any other questions! I can also provide a more step-by-step explanation if needed.

The kinds of the solids are;

SiO2 - Covalent network solid

C6H12O6 - Covalent solid

KI - Ionic solid

A covalent network solid, often referred to as a network covalent solid or just a network solid, is a category of solid material in which the atoms that make up the material are strongly covalently linked to one another, forming an extended three-dimensional network structure.

Covalent network solids are kept together by a dense network of covalent bonds, as opposed to molecular or ionic solids, which are held together by weaker intermolecular forces or ionic interactions, respectively.

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The collision frequency and molecular orientation are incorporated in the value of the activation energy (Ea) in the Arrhenius equation.

The Arrhenius equation is a mathematical expression that describes the temperature dependence of reaction rates. It states that the rate constant (k) of a chemical reaction is directly proportional to the frequency of successful collisions between reacting molecules, and is given by the equation:

k = Ae^(-Ea/RT),

where A is the pre-exponential factor, Ea is the activation energy, R is the gas constant, and T is the temperature in Kelvin.

This equation predicts that as the temperature increases, the reaction rate will also increase due to the increase in collision frequency and molecular orientation, which are both incorporated in the activation energy (Ea).

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Answer: This reaction will not occur, therefore it cannot be balanced.

Only certain metals reactive enough are able to replace a hydrogen on an acid. This only occurs if the metal is higher on the activity series than hydrogen. In this case Copper is not higher than Hydrogen on the activity series, thus it cannot replace the hydrogen. Meaning No Reaction.

Answer:Most amphibians start their life cycle as eggs that are laid in the water. The eggs hatch into larvae, which are commonly referred to as tadpoles. Tadpoles spend their early life in the water, feeding on algae and other plant material. As they grow and develop, they undergo metamorphosis, which is a process where they transform into terrestrial adults. During metamorphosis, the tadpoles develop legs and lungs, and their tails are reabsorbed. Once the metamorphosis is complete, the young amphibians are able to live on land and breathe air. This life cycle is common to most amphibians, including frogs, toads, and salamanders.

Explanation:

Answer:

Amphibians typically lay eggs in water which hatch into larvae (aquatic juveniles). These larvae undergo metamorphosis and eventually emerge from the water as land-dwelling adults. Some species may also reproduce on land through a process called oviparity where they lay eggs directly onto land.

May I please have brainliest?

The question requires us to calculate the molecular mass of a gas, given its density (1.2 g/L) and conditions of pressure (745 torr) and temperature (20°C).

Density is defined as the mass of a compound over its volume. From this definition, we can calculate the molecular mass of the gas knowing the density, as given by the question, and the volume of 1 mol of the gas.

We can calculate the volume of a gas considering the equation of Ideal Gases:

where P is the pressure of the gas, V is its volume, n is the number of moles, R is the constant of gases and T is the temperature.

Note that the constant of gases R was given in units of L.atm/K.mol, while the pressure and temperature were given in Torr and °C, respectively. Thus we need to convert these values to the appropriate units.

Knowing that 1 Torr corresponds to 0.00131579 atm:

1 Torr --------------------- 0.00131579 atm

745 Torr ---------------- x

Solving for x, we have that 745 Torr corresponds to 0.980 atm.

To convert the temperature from Celsius degrees to Kelvin, we must add 273.15:

T = 20 + 273.15 K = 293.15 K

Therefore, the pressure and temperature we'll use in our calculation are 0.980 atm and 293.15 K. Also, since we are calculating the molecular mass, we'll consider 1 mol of gas.

Rearranging the equation of ideal gases to calculate the volume and applying the values to the equation, we'll have:

Therefore, the volume of 1 mol of the gas under the conditions given is 24.6L.

Next, we'll use this value to calculate the molecular mass using the density given by the question:

Therefore, the gas given by the question presents 29.5g per mol.

Answer:

long chainlike molecules composed of a series of nearly identical building blocks called nucleotides.

Explanation:

Each nucleotide consists of a nitrogen-containing aromatic base attached to a pentose (five-carbon) sugar, which is in turn attached to a phosphate group.

Answer:

in a solution of salt in water, the solute is salt, and solvent is water.

Explanation:

C) salt is the solute, water is the solvent.

Answer:

C

Explanation:

:)

The mass of water required to change the temperature of water from 25.0°C to 35.0°C when 4,000 joules of energy are released is 95.6g.

The mass of a substance in a calorimetry procedure can be calculated by using the following formula:

Q = mc∆T

Where;

According to this question, a sample of water is changed from 25.0°C to 35.0°C when 4,000 joules of energy are released. The mass of the water sample is as follows:

4000 = m × 4.184 × 10

4000 = 41.84m

m = 95.6g

Therefore, 95.6 grams is the mass of the water sample.

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Answer:

Sonoluminescence can occur when a sound wave of sufficient intensity induces a gaseous cavity within a liquid to collapse quickly. [...] The bubbles are very small when they emit the light—about 1 micrometer in diameter—depending on the ambient fluid (e.g., water) and the gas content of the bubble (e.g., atmospheric air).

Explanation:

Source is Google

Answer:

In displacement reactions

Explanation:

Answer:

0.629 atm

Explanation:

P1V1 = P2V2

P1 = 0.986 atm

V1 = 10.2 L

P2 = ?

V2 = 16.0 L

Solve for P2 --> P2 = P1V1/V2

P2 = (0.986 atm)(10.2 L) / (16.0 L) = 0.629 atm

Answer:

Gravity

Explanation:

The following factors contribute to plate tectonics: The Mantle's Convection. Mountain push gravitational force at the spreading ridges, Block pull gravitational force in subduction zones. Hence, option B is correct.

The gravitational force, which is what pushes mass-containing objects toward one another. We frequently consider the pull of gravity from the Earth. Your body is kept on the ground by this force. However, all mass-bearing objects are pulled toward one another by gravity.

Population growth and changes in people's wants and activities are the main causes behind this. Changes in the overall levels of output and consumption are caused by these main movers.

The driving forces put strain on the environment through these modifications to production and consumption. In the direction of motion, gravity produces an active driving force.

Thus, option B is correct.

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the energy emitted by photon was 0.300564×10-18 J

what is photon?

The term photon, which means "light" in Ancient Greek, refers to a basic particle that is a quantum of the electromagnetic field, which includes electromagnetic radiation like light and radio waves. It also serves as the force carrier for the electromagnetic force. Considering that photons have no mass, they always travel at the speed of light in a vacuum, which is 299792458 m/s (or 186,282 mi/s).

formula was

ΔE=R(1n2f−1n2i)

R=the Rydberg constant, 2.178×10-18 J

For a transition from n=3 to n=2, we get

ΔE=2.178×10-18 J(1/22−1/32)

=2.178×10-18 J(1/4−1/9)

=2.178×10-18 J× 9 – 4/9×4

=2.178×10-18 J× 5/36

=0.300564×10-18 J

hence the energy emitted by the photon was 0.00564x10-18J

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Answer:

4. 264.6J

5. 37.5J

6. 96J

7. 55Watts

8. 77.14m

9. 6s

10. 750Watts

Explanation:

4). Mechanical energy (potential energy) = mass (m) × acceleration due to gravity (g) × height (h)

m = 3kg, h = 9m, g = 9.8m/s²

P.E = 3 × 9 × 9.8

= 264.6J

5). Kinetic energy (K.E) = 1/2 × m × v²

Where;

m = mass (kg) = 3kg

v = velocity (m/s) = 5m/s

K.E = 1/2 × 3 × 5²

K.E = 1/2 × 3 × 25

K.E = 1/2 × 75

K.E = 37.5J

6). Work done (J) = Force (N) × distance (m)

Force = 12N, distance = 8m

Work done = 12 × 8

= 96J

7). Power = work done (J) ÷ time (s)

Work done = 550J, time = 10s

Power = 550/10

= 55Watts.

8). Work done = force (F) × distance (m)

Work done = 540J, force = 7N, distance = ?

540 = 7 × d

540 = 7d

d = 540/7

d = 77.14m

9). Power = work done (J) ÷ time (s)

Work done = 300J, time = ?, Power = 50Watts.

50 = 300/t

50t = 300

t = 300/50

t = 6seconds.

10). Power = work done (J) ÷ time (s)

This means that;

Power = force × distance / time

Force = 300N, distance = 5m, time = 2s

Power = 300 × 5 ÷ 2

Power = 1500 ÷ 2

Power = 750Watts

A student proposes the following lewis structure for the peroxide ion.

what is formal charge?

A hypothetical charge that might be present on an atom in a molecule is known as a formal charge. It makes the corresponding polarity assumption that sharing electrons are equally spaced from the parent atoms. Polarity is the presumption that, unless parent atoms are identical, such as H-H, electrons are never equally distant from them.

For a polyatomic ion, the formal charges must add up to the ion's charge rather than the sum of the formal charges on all the atoms in the molecule (which may be positive or negative). Formal Charge = [Valence electron count in a single atom] - [(number of bonding electrons) 12 (number of lone pair electrons)]

The peroxide has a formal charge of -2.

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Answer:

Terms in this set (26) What do the formulas, arrow, and plus signs in a chemical equation tell you? Elements and compounds involved in the reaction, the arrow means "yields" and points to products, and the plus sign indicate two or more reactants or products.

Explanation:

Answer:

pH of HCl solution is 1.52, which suggests that dilute HCl solution is very acidic in nature.

Algae blooms are most often caused by eutrophication.

Algae blooms are are dense layers of tiny green plants that occur on the surface of lakes and other bodies of water when there is an overabundance of nutrients (primarily phosphorus) on which algae depend.

Algae species tend to proliferate in growth (bloom) in the presence of abundance nutrients. This abundance of nutrients is as a result of a process called eutrophication.

Eutrophication is the ecosystem's response to the addition of artificial or natural nutrients, mainly phosphates, through detergents, fertilizers, or sewage, to an aquatic system.

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Answer:

mining of clay limestone and then heated to a certain temperature of 1450⁰ in a cement kiln

The species in order of increasing bond angle are: H2O (104.5 degrees) < NH3 (107 degrees) < CH4 (109.5 degrees).

a. To draw the Lewis electron-dot structure for each of the three species, we need to determine the total number of valence electrons for each molecule/ion and then distribute them around the central nitrogen atom according to the octet rule.

i. NH3 (Ammonia):

Nitrogen (N) has 5 valence electrons, and hydrogen (H) has 1 valence electron each. Since ammonia (NH3) has three hydrogen atoms bonded to nitrogen, the total number of valence electrons is 5 + (3 × 1) = 8.

The Lewis structure of NH3 is as follows:

    H

    |

H - N - H

    |

ii. H2O (Water):

Oxygen (O) has 6 valence electrons, and hydrogen (H) has 1 valence electron each. Since water (H2O) has two hydrogen atoms bonded to oxygen, the total number of valence electrons is 6 + (2 × 1) = 8.

The Lewis structure of H2O is as follows:

H - O - H

iii. CH4 (Methane):

Carbon (C) has 4 valence electrons, and hydrogen (H) has 1 valence electron each. Since methane (CH4) has four hydrogen atoms bonded to carbon, the total number of valence electrons is 4 + (4 × 1) = 8.

The Lewis structure of CH4 is as follows:

    H

    |

H - C - H

    |

    H

b. To list the species in order of increasing bond angle, we need to consider the electron pair repulsion theory (VSEPR theory), which states that electron pairs around a central atom repel each other, resulting in specific bond angles.

From the Lewis structures drawn above, we can determine the bond angles as follows:

i. NH3 (Ammonia): The central nitrogen atom in NH3 has one lone pair of electrons and three bonding pairs. According to the VSEPR theory, the lone pair occupies more space than bonding pairs, causing a slight compression of the bond angles. The bond angle in NH3 is approximately 107 degrees.

ii. H2O (Water): The central oxygen atom in H2O has two lone pairs of electrons and two bonding pairs. The presence of two lone pairs causes further repulsion, resulting in a smaller bond angle. The bond angle in H2O is approximately 104.5 degrees.

iii. CH4 (Methane): The central carbon atom in CH4 has four bonding pairs, and there are no lone pairs. The bonding pairs are evenly distributed around the carbon atom, resulting in a symmetric tetrahedral shape. The bond angle in CH4 is approximately 109.5 degrees.

Therefore, listing the species in order of increasing bond angle, we have: H2O (104.5 degrees) < NH3 (107 degrees) < CH4 (109.5 degrees).

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