How many liters of a 0.75 M solution can be made with 75 grams of lead (ll) oxide?

To read the measuring cylinder we first count the number of smaller divisions between the marked interval. In this case it is 10 intervals. The marked intervals are 60 and 80, therefore between these values we have 20. We will now divide the 20 by the 10 intervalswhich is equal to 2. Now each interval has a numerical value of 2. We read from the bottom of the meniscus. The meniscus is ttouching the 5th line and so we say 5 x 2=10, we add this to 60.

Answer: 60+10= 70,

The wavelength and the energy would be2.67 × 10⁻⁴ meters and 7.02998 × 10 ⁻²⁰ Joules and respectively if the photon has a frequency of 11.23 × 10¹³ Hz.

It can be understood in terms of the distance between any two similar successive points across any wave.

C = λν

As given in the problem we have to calculate the energy and the wavelength of a photon with a frequency of 11.23 × 10¹³ Hz.

The wavelength of the photon = 3 × 10 ⁸ / 11.23 × 10¹³ Hz.

                                                   = 2.67 × 10⁻⁴  meter

The energy of the photon of light = h × ν

                                                       = 6.26 × 10⁻³⁴ × 11.23 × 10¹³ Hz.

                                                      = 7.02998 × 10 ⁻²⁰ Joules

Thus, the wavelength and the energy would be 2.67 × 10⁻⁴  meter and  7.02998 × 10 ⁻²⁰ Joules and respectively if the photon has a frequency of 1.1 × 10¹⁷ Hz.

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- The numbers are called subscripts which is the total atoms of the elements present in a compound.

- The subsripts can change depending on the type of compound.

The subcripts in a chemical compounds allow us to us know or determine the total atoms of such element that is present in the compound. For instance, in H2O (water), the subscript 2 in H2O shows that there 2 atoms of hydrogen in the compound (H2O).

They numbers differs depending on the type of compound. For instance O2 is oxygen while O3 is ozone

Answer:

Explanation:

Here, we want to give the names or formulas of the given hydrates

1) Magnesium sulfate heptahydrate

The first thing we have to do here is write the formula for magnesium sulfate.

Hepta means 7, which is pointing to the fact that there are 7 water molecules

We can have this as:

6) Here, we can see that the element involved is cobalt with an oxideation number of 2. We also have just one water of crystallization

So, we have the name of the compound as:

Answer:

d. Nickel

Explanation:

The atomic radius is a periodic property, that is, we can see how it varies in the Periodic Table of Elements.

Atomic radius increases by a column (group) from top to bottom, and increases by a row (period) from right to left.

We can see the variation of atomic radius and the location of the given atoms in the following drawing:

Since K (potassium), Ca (calcium), Co (cobalt) and Ni (nickel) are located in the same row (period), to identify which one has the smallest atomic radius, we have to analyze the increase in horizontal atomic radius.

So, the Ni atom has the smallest atomic radius (because it is located more to the right compared to the other atoms in the same row) and K atom has the largest atomic radius.

So,

The s sublevel has just one orbital, so can contain 2 electrons max. The p sublevel has 3 orbitals, so can contain 6 electrons max. The d sublevel has 5 orbitals, so can contain 10 electrons max. And the 4 sublevel has 7 orbitals, so can contain 14 electrons max.

Therefore, the correct answer is:

s:2, p:6, d:10, and f:14

Answer:

262

Explanation:

Answer:

Explanation:

Here, we want to get the number of moles in the given mass

Mathematically:

The molar mass of CaCO3 is 100 g/mol

The number of moles is thus:

Except for NACLE, the is made up of ionic compounds. Carbon disulfide bonds are not ionic due to their weak and trivial polarity. Carbon disulfide bonds are covalent due to the small difference in electronegativities of carbon and sulfur.

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When we have a mixture of gases, the pressure exerted by each depends on the number of moles present in the mixture, this contribution is called partial pressure. The sum of the partial pressures will be equal to the total pressure, this is called Dalton's law.

Partial pressure can be described by the following equation:

Where,

Pi is the partial pressure

Xi is the molar fraction

Pt is the total pressure

The molar fraction is calculated by the following equation:

Where,

ni is the number of moles of the substance

nT is the total number of moles.

So, we have to find first the number of moles of each gas. We are given the grams of gases, to get the equivalent moles we must divide the mass by the molar mass.

Molar Mass N2=28.0134g/mol

Molar Mass O2=31.9988g/mol

Now, the partial pressure of N2 will be:

If we assume that the gas behavior is like an ideal gas, we can find the total pressure with the following equation:

Where,

n is the total number of moles, 0.069mol

R is a constant, 0.08206atm.L/mol.K

V is the volume of the gas, 1.51L

T is the temperature of the gas, K.284.15K

We replace the known data:

Now, the partial pressure of nitrogen will be:

Answer: The partial pressure of N2 is 0.69atm

The chemical equation will be written as:

2C2H6 + 7O2    → 6H2O + 4CO2

Therefore,

The chemical equation will be written as:

2C2H6 + 7O2    → 6H2O + 4CO2

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Answer:

C.

Explanation:

The correct way to write the diagram of an ionic compound is:

- Use brackets by writing inside them, the symbol of each element separately.

- Draw the symbol and the number o the charge of each one, negative (-) add positive +()., in this case it is +1 for Mg (because Mg lost an electron) and -1 for O (because O won an elec).

87.77 ml will provide the recommended daily allowance of vitamin C.

- To calculate the milliliters of vegetable juice that will provide 100% of the recommended daily allowance of vitamin C, we can use a mathematical Rule of Three:

So, 87.77 ml will provide the recommended daily allowance of vitamin C.

Introduction

Water is a molecule that composed of chemical elements oxygen and hydrogen. Waterrogen. Water behaves differently than other substances, this is because water can be changed from being a solid to liquid or a gas (vapour). This is known as changing state of matter. Water is a liquid at room temperature, however, it becomes a solid when the temperature is cooled down. The same water can turn into vapour or gas if it is heated up to a certain temperature. Therefore the state of water depends on the temperature.

Solid water

At a temperature below or equal to zero degrees Celsius, the water molecule turns to be a solid (ice), this is called freezing. At this state the water molecules are packed close together, this prevents water from changing its shape, thus, the atoms in solid water are not active, even when ice is removed from its container, it retains its shape. Water in its solid state has a very regular pattern whereby the water molecules are apart from one another and are connected by hydrogen bonds which forms a crystalline lattice. These crystals have a number of open regions and pockets which makes ice less dense than liquid water. This is the main reason ice floats on water. In the solid state, there is not enough thermal energy to overcome the intermolecular forces (hydrogen bonding), thus particles vibrate around fixed axes.

Liquid water

When the ice is warmed from its freezing point, the water molecule changes from solid to liquid water, when the temperature is higher than zero but lower than 100 degrees Celsius. This process is called melting. The attractive forces between the water molecules weaken and individual molecules begin to move around each other, but they are still attracted to each other. Since liquid water molecules can move around, this state can take the shape of its container. The spacing of liquid water molecules per unit volume are actually smaller than it is for solid water, which means liquid water is more denser than solid water. Liquid water have no definite shape, however, has a definite volume.

Gas water

The third state of water is its gaseous state. In this state water molecules move freely and rapidly because they are not bound together. The change form liquid to vapour or gas is called vaporization, this process occurs at a temperature of 100 degrees Celsius. Gas water molecules have no definite shape, nor definite volume. Particles or atoms move randomly and are less attracted to each other. Gas water molecules are highly compressible.

Conclusion

Water exists in three forms or states. These include solid, liquid and gaseous states. Water is a liquid at room temperature, whereas it is a solid at temperatures below or equal to zero. When the water is heated up to 100 degrees Celsius, it turns to a gaseous state.

1. The concentation of the magnesium ion, Mg²⁺ in the solution is 0.01 M

2. The concentation of the nitrate ion, NO₃⁻ in the solution is 0.02 M

We'll begin by obtaining the concentration of the stock solution. This can be obtained as follow:

Concentration = mole / volume

Concentration = 0.25 / 1

Concentration = 0.25 M

Next, we shall determine the concentration of the diluted solution

C₁V₁ = C₂V₂

0.25 × 20 = M₂ × 500

5 = M₂ × 500

Divide both side by 500

C₂ = 5 / 500

C₂ = 0.01 M

1. How to determine the concentration of magnesium ion, Mg²⁺

Mg(NO₃)₂(aq) <=> Mg²⁺(aq) + 2NO₃⁻(aq)

From the balanced equation above,

1 mole of Mg(NO₃)₂ contains 1 mole of Mg²⁺

Therefore,

0.01 M Mg(NO₃)₂ will also contains 0.01 M Mg²⁺

Thus, the concentration of Mg²⁺ is 0.01 M

2. How to determine the concentration of nitrate ion, NO₃⁻

Mg(NO₃)₂(aq) <=> Mg²⁺(aq) + 2NO₃⁻(aq)

From the balanced equation above,

1 mole of Mg(NO₃)₂ contains 2 mole of NO₃⁻

Therefore,

0.01 M Mg(NO₃)₂ will contain = 0.01 × 2 = 0.02 M NO₃⁻

Thus, the concentration of NO₃⁻ is 0.02 M

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The volume of a gas that has a pressure of 1.25 atm at 22℃ is 96.88L.

The volume of a gas can be calculated by using the following formula:

PV = nRT

Where;

According to this question, 5.00 mole sample of oxygen gas has a pressure of 1.25 atm at 22℃. The volume can be calculated as follows:

1.25 × V = 5 × 0.0821 × 295

1.25V = 121.0975

V = 96.88L

Therefore, 96.88L is the volume of the gas

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Step 1

The reaction provided:

2 Mg (s) + O2 (g) => 2 MgO (s) (completed and balanced)

-----------

Step 2

Information provided:

40.0 g of O2 which react completely

---

Information needed:

The molar masses of:

O2) 32.0 g/mol

MgO) 40.3 g/mol

-----------

Step 3

By stoichiometry,

2 Mg (s) + O2 (g) => 2 MgO (s)

32.0 g O2 ------- 2 x 40.3 g MgO

40.0 g O2 ------- X

X = 40.0 g O2 x 2 x 40.3 g MgO/32.0 g O2

X = 101 g MgO

Answer: C 101 g

We have the following formulas for the given compounds:

1. Magnesium nitride ---> Mg3N2

2. Lithium oxide ---> Li2O

3. Aluminum sulfite ---> Al2(SO4)3

4. Copper (II) bicarbonate ---> Cu(HCO3)2

5. Sodium nitrate ---> NaNO3

For the given formulas we have the following names:

6. SrI2 ---> Strontium iodide

7. Ba3(PO4)2 --->Barium phosphate

8. (NH4)2O ---> Ammonium oxide

9. Fe(ClO)3 ---> Iron(III) hypochlorite

10. ZnCrO4 ---> zinc chromate

Answer:

Reducing the activation energy and providing an alternative reaction pathway for the reaction to happen

Explanation:

A lower activation energy means that reactants will need less energy to successfully react to make products, meaning that more successful collisions will happen between reactants, increasing the rate of reaction

A catalyst reduces the activation energy of the reaction, speeding it up. By decreasing the activation energy, the energy hurdle that must be cleared for a chemical reaction to take place, catalysts improve the efficiency of this process.

By decreasing the activation energy, the energy hurdle that must be cleared for a chemical reaction to take place, catalysts improve the efficiency of this process.

As a result, catalysts facilitate the formation of chemical bonds between atoms to create novel combinations and new compounds.

A catalyst is a chemical that may be included in a reaction to speed up the process without being consumed. Typically, catalysts shorten the activation energy of a process or alter its mechanism. Proteins called enzymes serve as catalysts in biological processes.

Thus, the catalyst reduces the activation energy of the reaction, speeding it up

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The decay of this radioactive unknown compound is a first-order process.

We can express the time dependence of its mass m using a first-order integrated rate law, where k is the rate constant:

mt = mass at time t

m0 = initial mass

t = time

-----------------------------------------------------------------------------------------------------

Procedure:

1) We need to find "k":

From the first-order rate law we clear k,

----------------------------------------------------------------------------------------------

2) We find the half-life from the value of k we have just calculated:

-----------------------------------------------------------------------------------------------

3) The number of half-lives of the unknown sample is:

Number of Half-lives = 47 days / 15.7 days = 3 (approx.)

Answer: Number of half-lives = 3

The initial temperature of the argon is 2678 K

Given that,

Initial volume (V1) = 4.95 L

Initial pressure (P1) = 0.92 atm

Final temperature (T2) = 30 C = 303.15 K

Final volume (V2) = 5.7 L

Final pressure (P2) = 0.092 atm

We need to find the Initial temperature of the argon represented as T1

We Know that, In ideal gas law: PV = nRT

It can be written as, P1V1 / T1 = P2V2 / T2

(0.92 * 4.95) / T1 = (0.092 * 5.7) / 303.15

4.554 / T1 = 0.5244 / 303.15

4.554 / T1 = 0.0017

T1 = 4.554 / 0.0017

T1 = 2678 K

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To answer this question we have to compare the specific heats of each substance.

The specific heat of a substance is the amount of energy required to make 1 gram of a substance increase its temperature by 1 °C. The greater the specific heat of a substance the more energy it will be required to heat it up.

The specific heat of water is 4.18J/g°C and the specific heat of aluminum is 0.897J/g°C.

It means that the amount of energy required to heat water is greater than the one to heat aluminum.

It means that the answer is TRUE.

The normal range of creatinine in human blood is between 0.50 mg/dL and 1.1 mg/dL. The patient's blood has a concentration of 0.0082 g/L. Let's convert that value into mg/dL.

We kwnot that there are 1000 mg in 1 g. And there are 10 dL in 1 L. We have to use those conversions.

1000 mg = 1 g 10 dL = 1 L

0.0082 g/L = 0.0082 g/L * 1000 mg/g = 8.2 mg/L * 1 L/ (10 dL) = 0.82 mg/dL

0.0082 g/L = 0.82 mg/dL

0.50 mg/dL < 0.82 mg/dL < 1.1 mg/dL

Answer: The concentration of creatinine = 0.82 mg/dL. It is in the normal range.

Radon is a naturally-occuring radioactive gas that can cause lung cancer to those who are near it. Radon is also an inert, colorless and odorless gas. Although it is dangerous and hazardous, it disperses rapidly and, usually, is not a health issue. Answer is Radon

Answer:

0.9933

(Text Text Text)

answer and explanation

Radioactivity is the emission of ionizing radiation from nuclear decay. there are three types of radioactive decay.

alpha decay

in alpha decay an alpha particle is released. In the parent atom, the atomic number decreases by 2 and the atomic mass decreases by 4

beta decay

in beta decay a beta particle is released, the atomic number is unchanged and the atomic mass increases by 1

gamma decay

in gamma decay, energy is released as gamma rays from an excited nuclear state. the atomic mass and atomic number remain unchanged.

PO₄ appears in two different places in this chemical equation. PO₃⁻⁴ is a polyatomic ion called phosphate. 2 should be placed in front of Na₃PO₄ to give the same total number of phosphate ions on each side of the equation.

For the reaction -

? Na₃PO₄ + MgCl₂  →  Mg₃(PO₄)₂ + NaCl

There are 2 phosphate ions present on the product side, therefore, 2 phosphate atoms should be present on the reactant side to maintain the equilibrium.

On product side, number of ions of magnesium is 3, so to attain the equilibrium and balance the equation there 3 ions of magnesium should be on the reactant side.

In order to balance the number of ions of phosphate and magnesium in the reaction which is given -

On the reactant side, 6 atoms of chlorine and sodium are formed, in order to balance these 6 atoms of chlorine and sodium, 6 atoms of each should be present on the product side.

Therefore, the balanced chemical equation is -

2 Na₃PO₄ + 3 MgCl₂  →  Mg₃(PO₄)₂ + 6 NaCl

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Kinect-molecular theory hypothesis:

- The formation of a gas occurs by a large number of molecules;

- Gas molecules have a negligible dimension, which means that the volume occupied by them is very small, almost insignificant;

- These gases move in a discontinuous and random way, thus occupying the entire volume of the container where they are found, having a rectilinear and uniformly varied movement;

- They are independent, they only interact with each other when a collision occurs;

- Collisions between molecules and molecules and between molecules and container walls are elastic collisions, which cause the kinetic energy of the molecules to remain constant.

Having seen these statements, the answers can only be:

The warmer a glass of water, the faster a drop of ink will spread through the water.

The colder a room is, the longer it would take to smell a spray of perfume from the other side of the room.

The theoretical yield, in grams, of CO₂ is 93.97g having molar mass 44g

What is molar mass ?

The "counting unit" used by chemists to describe the quantity of atoms, ions, molecules, or formula units in a specific chemical sample is called a mole. The mole is comparable to other counting units you have employed in the past, such as pair (2), dozen (12), and gross (144). Avogadro's number (6.022 x 1023) of molecules (or formula units) make up one mole of a substance (ionic compound). The mass of 1 mole of a chemical is indicated by its molar mass. It provides you with the amount of grammes per mole of a substance, to put it another way. Therefore, grams/mole are the units for molar mass.

2C2H2 + 5O2=====> 4CO2+2H2O

Molar Mass of C2H2 = 2*12+2*2 = 28g = 1 mol

2 mol of C2H2 = 28*2 = 56g

Molar Mass of  CO2 = 12+2*16 = 44g = 1 mol

4 mol of CO2 = 4*44 = 176g

56g of C2H2 gives 176g of CO2

29.9g of C2H2 gives 176*29.9/56g of CO2

                                   = 93.97g of CO2

The theoretical yield, in grams, of CO₂ is 93.97g having molar mass 44g

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