I really need some help on this stuff.

Answer:is Cl and H

Explanation:

2Cd+2Hcl=2CdCl + H2

Answer:

properties

Explanation:

The properties of matter are the various ways in which matter behaves under certain circumstances.

Various substances have different volumes and shapes. These differences account for the various properties of matter.

The number of atoms present in 2.9 mL of liquid mercury.

First, let's find the mass of mercury in 2.9 mL. We can do this by multiplying the volume (2.9 mL) by the density of mercury (13.6 g/mL):

Mass = Volume × Density
Mass = 2.9 mL × 13.6 g/mL
Mass ≈ 39.44 g

Now, we'll convert the mass to moles using the molar mass of mercury (200.59 g/mol):

Moles = Mass ÷ Molar Mass
Moles = 39.44 g ÷ 200.59 g/mol
Moles ≈ 0.1966 mol

Finally, let's find the number of atoms using Avogadro's number (6.022 × 10^23 atoms/mol):

Number of atoms = Moles × Avogadro's Number
Number of atoms ≈ 0.1966 mol × 6.022 × 10^23 atoms/mol
Number of atoms ≈ 1.18 × 10^23 atoms

So, there are approximately 1.18 × 10^23 atoms present in 2.9 mL of liquid mercury.

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The number of sodium, potassium and ATP would be: 700 Na+ ions, 200 K+ ions and 900 ATP molecule.

The net charge differential would be -200.  

Potassium is important for keeping the body hydrated and with sodium support cellular function (sodium-potassium ( Na⁺/K⁺) pump).

The sodium-potassium pump releases three Na+ ions, while in the same time two K+ ions exit the cell. For this process one molecule of ATP is consumed.

Inside the cell, there are 1000 sodium ions, 1000 molecules of ATP.

While outside the cell, there are 1000 potassium ions.

After 100 cycles, 300 sodium ions will exit the cell and 200 potassium ions will enter the cell, using 100 ATP molecules.

1000 - 300 = 700; number of sodium ions (Na+) left in the cell

1000 - 100 = 900; ATP molecules left in the cell

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Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

From the question

mass of object = 20 g

volume = 100 mL

Substitute the values into the above formula and solve

That's

\(Density = \frac{20}{100} \\ = \frac{2}{10} \\ = \frac{1}{5} \)

We have the final answer as

Hope this helps you

Answer:

Both the assertion and reason are false

Explanation:

A buffer is a solution that resists changes in acidity and alkalinity. When a solution is buffered, it pH can only vary within a small range. A buffer is made up of a weak acid/base and its salt.

When a strong acid is added to a buffer solution, the conjugate base will react with the H+ from the strong acid to form the undissociated weak acid HA as follows; H+(aq) + A- (aq)→ HA(aq). Hence, H+ concentration decreases owing to its reaction with the A- thus the pH changes only slightly.

At the time when the strong acid should be added so here Both the assertion and reason are false

It is a solution that resists changes with respect to the acidity and alkalinity. When a solution should be buffered, it pH can only change within a small range. At the time when a strong acid should be added to a buffer solution, the conjugate base should be react with the H+ from the strong acid to form the undissociated weak acid.

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The mass of an element released during electrolysis is inversely proportional to the amount of electricity flowing through the electrolyte, according to the first law.

Mathematically, this can be expressed as: deposited mass, current, I, and time, t, or deposited mass, It. Where Q=Charge, M=Molarmass, n=nfac. A) M=Qm/Fn, the mass (m) of a substance deposited on the cathode or anode during electrolysis is given. Silver atoms are added to the cathode and subtracted from the anode for each element that circles the external circuit. This indicates that the mass obtained by the cathode is equal to the mass lost by the anode (assuming the silver anode is pure; see below).

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To calculate the new volume of a balloon when the temperature drops, use the formula \(V2 = V1(T2/T1)\). The new volume is 2.34 L.

To compute the new volume of a gas when the temperature transforms, we want to utilize the ideal gas regulation, which expresses that \(PV = nRT\), where P is the strain of the gas, V is its volume, n is the quantity of moles, R is the all inclusive gas steady, and T is the outright temperature. We can accept that the strain and number of moles of the gas stay consistent.

Nonetheless, in this issue, we are given the volume and temperature of an inflatable, which suggests that the gas inside is certainly not an optimal gas. In any case, we can involve the ideal gas regulation as an estimation since the gas is near ideal circumstances.

To tackle for the new volume, we can utilize the recipe \(V2 = V1(T2/T1)\), where V1 is the underlying volume, T1 is the underlying temperature, T2 is the last temperature, and V2 is the last volume we are attempting to find.

Subbing the given qualities, we get:

\(V2 = 2.50 L * (284.15 K/303.15 K) = 2.34 L\)

Hence, on the off chance that the temperature decreases from 30.0∘C to 11.0∘C, the volume of the inflatable would diminish from 2.50 L to 2.34 L. The recipe to utilize is \(V2 = V1(T2/T1)\), which relates the underlying volume and temperature to the last volume and temperature utilizing a consistent proportion.

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\(\\ \tt\leadsto -log[H^+]=5.31\)

\(\\ \tt\leadsto log[H^+]=-5.31\)

\(\\ \tt\leadsto [H^+]=antilog(-5.31)\)

\(\\ \tt\leadsto [H^+]=4.89\times 10^{-6}M\)

Answer:

Adding Na3PO4(s) will introduce more PO4^3- ions into the solution, which will react with H3O+ ions to form more H3PO4 and H2O through the reverse reaction. This will shift the equilibrium to the left, decreasing the concentration of H3O+ ions and increasing the concentration of H3PO4 and H2O. Therefore, the concentration of H3O+ ions will decrease, and the correct answer is (C) H3O+.

The mass of carbon dioxide released during the reaction is 2.6 grams.

To determine the mass of carbon dioxide released during the reaction between sodium hydrogen carbonate (NaHCO3) and acetic acid (CH3COOH), we need to calculate the difference in mass before and after the reaction.

Before the reaction:

Mass of NaHCO3 = 3.8 g

Mass of acetic acid = 10.5 g

Total mass before the reaction = Mass of NaHCO3 + Mass of acetic acid = 3.8 g + 10.5 g = 14.3 g

After the reaction:

Mass of the contents of the reaction vessel = 11.7 g

To find the mass of carbon dioxide released, we calculate the difference in mass:

Mass of carbon dioxide released = Total mass before the reaction - Mass of the contents of the reaction vessel

= 14.3 g - 11.7 g

= 2.6 g

Therefore, the mass of carbon dioxide released during the reaction is 2.6 grams.

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Answer:

Mass of butane = 1.87 g

Explanation:

Form a balanced chemical equation for the reaction stated:

C₄H₁₀ + 13/2 O₂ → 4CO₂ + 5H₂O

Number of moles of CO₂

\( = \frac{mass}{molar \: mass} \)

\( = \frac{15}{12 + 2(16)} \)

\( = 0.34 \: mol\)

From the equation,

1 mol C₄H₁₀ : 4 mol CO₂

0.085 mol C₄H₁₀ : 0.34 mol CO₂

Mass of butane

\( = number \: of \: moles \times molar \: mass\)

\( = 0.085 \times (12 + 10(1))\)

\( = 1.87 \: g\)

The grams of butane must be burned in an excess of Oxygen, to produce 15g of CO₂ is 1.87 grams.

Relation between mass and moles will be represented as:

n = W/M, where

W = require or given mass

M = molar mass

Given balance chemical reaction is:

C₄H₁₀ + 13/2O₂ → 4CO₂ + 5H₂O

Moles of 15g of CO₂ = 15g / 44g/mol = 0.34 moles

From the stoichiometry of the reaction, it is clear that:

4 moles of CO₂ = produced by 1 mole of C₄H₁₀

0.34 moles of CO₂ = produced by 1/4×0.34=0.085 moles of C₄H₁₀

Now we convert moles of butane to mass as:

W = (0.085)(22) = 1.87 g

Hence required mass of butane is 1.87 grams.

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Moderates weather so that highs and lows are less extreme because of sea breeze motion.

Sea breeze are that as the warm air from the land is rising and the cooler air from the ocean is flowing over land and will replace the warmer air that is rising. in simple words , land gets warmer during the day than the water and the hot air rising up and cooler air move towards the land  called as sea breeze. moderate weather is refers to that weather which is neither very cold nor very hot.

Thus, Moderate weather so that highs and lows are less extreme because of sea breeze motion.

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CrO and Cr₂O₃ make up the simplest chromium oxide formula.

What name does Cr₂O₃ use?

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By using the ideal gas law to get volume we have"

Where v is volume, T is temperatute, n is number of moles, R is the molar gas constant and P is pressure. At STP P= 101,325 Pa, T= 273.15 K and R= 8.314 J/mol K

We must first convert mass to moles:

By substituting this value into the ideal gas law we have:

1.9502e-6L of H2 gas reacted at STP

Answer:

18.73× 10²³ formula units

Explanation:

Given data:

Number of moles of Ca(NO₃)₂ = 3.11 mol

Number of formula units = ?

Solution:

Avogadro number:  

"It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance"  

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

Number of formula units of Ca(NO₃)₂:

1 mole contain 6.022 × 10²³ formula units

3.11 mol ×  6.022 × 10²³ formula units / 1 mol

18.73× 10²³ formula units

Thank you lord lord please thank you lord lord for that you lor

It is important to make sure the information is accurate whether writing a research paper, practising a speech, or working on any other project that depends on data from outside sources.

Let us write a short evaluation on OZONE HOLE.

A large portion of the Sun's bright radiation is absorbed by the ozone layer, a shield region of the stratosphere. It has a large concentration of ozone.

It contains oxygen atoms that shield the surroundings from harmful radiation, such as brilliant beams, that are emitted by the sun and are available in space.

The ozone opening is less of a gap in the windshield and more of a dip. There is neither a uniform thinning of the ozone layer nor does the ozone disappear through it. The French physicists Charles Fabry and Henri Buisson also discovered it in 1913.

A size of 7.6 million square miles (19.7 square kilometres) was reached by the ozone opening in 2017 before it started to close. The distance increased to 8 million square miles in 2016.

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They all eventually found balance and seemed to be moving at the same speed.

The correct option is A.

The immediate rate at the beginning of a reaction, or when t = 0, is known as the starting rate of the reaction. The beginning rate is equal to the slope of the concentration of the reactants versus time curve at time zero, which is negative. Top.

Reactions frequently get slower over time once reactants are exhausted. Even though they aren't reactants themselves, catalysts can speed up a process when they are introduced to it. An increase in reaction rate is caused by temperature increases of a chemical reaction.

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The complete question is -

You may have clearly been able to distinguish the difference in the time required for the initial reaction of HCl with zinc in the temperature study. However, after a very brief period, the three test tubes are reacting at the same rate. Explain this.

A) They all eventually found balance and seemed to be moving at the same speed.

B) The zinc is reacting with water, not HCl and all test tubes have water in them in similar amounts.

C) The reaction is exothermic; at some point the solutions all reach the same temperature, regardless of the temp of the water baths.

Answer:

B is the correct answer

The molar mass of KOH is 56.11 g/mol, and the molar mass of H2 is 2.02 g/mol. The mass of KOH produced by the reaction of one mole of potassium and one mole of water is 56.11 g, and the mass of H2 produced by the reaction of one mole of potassium and one mole of water is 2.02 g.

The equation indicates that two atoms of potassium react with two molecules of water to form two molecules of potassium hydroxide and one molecule of hydrogen gas.

This implies that the ratio of moles of potassium to water is 1:1, and the ratio of moles of potassium hydroxide to hydrogen is 2:1. The molar mass of K is 39.10 g/mol, and the molar mass of H2O is 18.02 g/mol. Thus, the mass of K that reacts with one mole of water is 39.10 g. Similarly, the mass of water that reacts with one mole of potassium is 18.02 g.

The equation relates the relative numbers of representative particles (atoms, molecules) and moles of reactants and products, as well as the masses of reactants and products involved in the reaction. This provides a basis for quantitative analysis of the reaction, such as determining the amount of product produced from a given amount of reactants.

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the 3rd one is the answer

According to kinetic theory of gases, when samples are heated from liquid to gas phase, particles move faster and spread out more. Hence, option a is correct.

According to kinetic theory of gases. Gaseous substances are made of tiny particles called molecules. The molecules within a container are in a state of random chaotic motion during which they collide with  each other.

At, a particular instant, different molecules in a sample of gas may have different velocities and hence, different kinetic energies.  The kinetic energy of molecules is directly proportional to the temperature.

Hence, the the sample  when heated, the molecules acquire higher kinetic energy and they will move apart. Therefore, option a is correct according to kinetic theory.

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To determine the density of NH3 gas at 435 K and 1.00 atm, we can use the ideal gas law equation:

PV = nRT

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

First, we need to find the number of moles of NH3 gas:

n = PV/RT

n = (1.00 atm) x V / [(0.08206 L atm/mol K) x (435 K)]

Assuming the volume of NH3 gas is 1 L:

n = (1.00 atm) x (1 L) / [(0.08206 L atm/mol K) x (435 K)]
n = 0.0276 mol

Next, we can use the formula for density:

density = mass/volume

To find the mass of NH3 gas, we can use its molar mass of 17.03 g/mol:

mass = n x molar mass
mass = 0.0276 mol x 17.03 g/mol
mass = 0.47 g

Therefore, the density of NH3 gas at 435 K and 1.00 atm is:

density = mass/volume
density = 0.47 g/1 L
density = 0.47 g/L
To determine the density of NH3 gas at 435 K and 1.00 atm, we can use the Ideal Gas Law formula, which is PV = nRT. Here's a step-by-step explanation:

1. Write down the given information:
  - Temperature (T) = 435 K
  - Pressure (P) = 1.00 atm
  - We also need the molar mass of NH3, which is 14.01 (N) + 3 * 1.01 (H) = 17.03 g/mol

2. Rearrange the Ideal Gas Law formula to solve for the number of moles (n) in one liter of NH3 gas:
  - n = PV/RT

3. Substitute the given values:
  - n = (1.00 atm) * (1 L) / (0.0821 L·atm/mol·K) * (435 K)
  - n ≈ 0.0279 mol/L

4. Calculate the mass of NH3 in one liter:
  - Mass = n * molar mass
  - Mass = 0.0279 mol/L * 17.03 g/mol ≈ 0.475 g/L

5. Determine the density of NH3 gas:
  - Density = Mass / Volume
  - Density ≈ 0.475 g/L / 1 L ≈ 0.475 g/L

So, the density of NH3 gas at 435 K and 1.00 atm is approximately 0.475 g/L.

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The physical property that describes how a substance will dissolve in another substance is called solubility.

Solubility is defined as the maximum amount of a substance in an effort to dissolve in a given quantity of solvent at a special temperature. Solubility is a characteristic asset of a particular solute-solvent combination, and special substances have significantly differing solubilities.

Solubility refers to the finest quantity of solute that may dissolve in a recognized quantity of solvent at a given temperature. In a solvent, an answer is a homogeneous mixture of one or more solutes. A not unusual instance of an answer is sugar cubes brought to a cup of tea or coffee.

Dissolution is the process where a solute in a gaseous, liquid or stable section dissolves in a solvent to shape an answer. Solubility is the maximum awareness of a solute that may dissolve in a solvent at a given temperature. at the most attention of solute, the solution is said to be saturated.

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Answer:

Radioactive

Explanation:

They're more unstable than my home life

Answer:

electons are added moving to the right

Explanation:

The decrease in atomic radius with increasing atomic number is best explained by the number of protons increasing and the number of shells of electrons remaining the same. Therefore, option (A) is correct.

The atomic radius of an atom can be described as the size of the atom, which is generally the mean distance from the center of the nucleus to the outermost electron of an atom.

In the periodic table,  as you move from left to right, the atomic number of elements in period 2 will continue to increase, because there is an increase in the number of protons which causes an increase in positive charge carried by each element while the number of shells of the electrons remains constant.

Therefore the Elements will attract more negative charges to themselves as we move from left to right in the period. As the atomic number of elements increases, there will be a decrease in the atomic radius of the elements.

Hence, the decrease in atomic radius with increasing atomic number is explained by the number of protons increasing and the number of shells of electrons in an atom remaining the same.

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Your question is incomplete most probably the complete question was,

As the elements in Period 2 of the Periodic Table are considered in succession from left to right, there is a decrease in atomic radius with increasing atomic number. This may best be explained by the fact that the

a. number of protons increases, and the number of shells of electrons remains the same

b. number of protons increases, and the number of shells of electrons increases

c. number of protons decreases, and the number of shells of electrons remains the same

d. number of protons decreases, and the number of shells of electrons increases