What is the name of the molecule below?HHOA. MethaneOB. MetheneO C. EthyneOD. EtheneC=CHH

Answer:

Explanation:

Here, we want to get the final pressure

From the pressure law, volume and temperature are directly proportinal

Mathematically:

Where:

P1 is the initial pressure which is 965 torr

P2 is ?

T1 is the initial temperature which we convert to Kelvin by adding 273 K(55 + 273 = 328 k

T2 is the final temperature which is 24 + 273 = 297 K

Substituting the values, we have it that:

Now, we convert this to mmHg

Mathematically, 1 torr = 1 mmHg

We have the final pressure as 873.80 mmHg

Answer:

Explanation:

Here, we want to get the amount of heat energy needed

Mathematically:

where:

Q is the amount of energy that we want to calculate

m is the mass of the iron sample which is 15 g

c is the specific heat capacity which is 0.448 J/g°C

ΔT is the change in temperature which is (100-22) = 78°C

Substituting the values, we have it as:

Explanation:

We have to find the bonds that are broken and formed during the following reaction.

__ C₂H₄ + __ O₂ ---> __ CO₂ + __ H₂O

First we have to balance the reaction. To balance a combustion reaction we usually start balancing the atoms of C. We have two on the left and 1 on the right side of the equation. So the coefficient for CO₂ must be 2.

__ C₂H₄ + __ O₂ ---> 2 CO₂ + __ H₂O

Then we balance the H atoms by changing the coefficient for water. We have 4 atoms of H on the left and two on the right. The coefficient must be 2.

__ C₂H₄ + __ O₂ ---> 2 CO₂ + 2 H₂O

And finally we can balance the O atoms by changing the coefficient for O₂. We have 6 O atoms on the right side, so the coefficient for O₂ must be 3. The balanced equation is:

C₂H₄ + 3 O₂ ---> 2 CO₂ + 2 H₂O

Now to determine the bonds that have to be broken we have to pay attention to the Lewis structures of the reactants. They are:

We have to break 4 C-H bond, 1 C=C and 3 O=O bond (since the coefficient for oxygen gas is 3).

The bonds that we have to form are:

We have to form 4 C=O bonds (since the coefficient for carbon dioxide is 2), and 4 O-H bonds (since the coefficient for water gas is 2).

Answer: Four C-H, one C=C and three O=O bond need to break up. Four C=O and 4 O-H bonds need to form. (second option)

The flow rate of the IV pump should be 17.06mL/hr.

1st) We need to calculate the patient's weight knowing that 1 lb is equal to 0.45 kg:

The patient weighs 106.65 kg.

2nd) If the patient needs a drip at 8.0 units per kg of body weight, we have to calculate the units for the patient:

So, the patient needs 853.2 units per hour.

3rd) To calculate the flow rate of the IV pump, we need to know the mL equivalent to 853.2 units:

So, the flow rate of the IV pump should be 17.06mL/hr.

Explanation:

Given the following reaction.

NO (g) + 1/2 O₂ (g) <---> NO₂ (g)

We have to find the relationship between its Kc and Kp.

The Kp can be calculated from the Kc using the following expression.

Kp = Kc * (R*T)^(Δn)

Where Δn is the sum of the coefficients of the products minus the sum of the coefficients of the reactants. So Δn will be equal to:

Δn = Σ n of products - Σ n of reactants

Δn = 1 - (1 + 1/2)

Δn = -1/2

So we can say that:

Kp = Kc * (R*T)^(Δn)

Kp = Kc * (R*T)^(-1/2)

Kc = Kp * (R*T)^(1/2)

Answer: Kc = Kp * (R*T)^(1/2)

Physical changes are changes in which there are no changes in the internal structure of substances. When there is a chemical change a chemical reaction is involved and the internal structure of the substance changes.

Of the four options that give us the first two: The oxidation of steel and burned paper represents an oxidation and combustion reaction respectively, so they correspond to chemical changes.

The second two options are phase changes, there is no chemical reaction and therefore the internal structure of the substances does not change. So the options to select will be:

Answer:

Acetone evaporating

Ice melting

Answer:

12 liters is equal to 0.075 barrels.

Explanation:

To convert liters into barrels, it is necessary to use the following conversions:

- 1 barrel = 42 gallons

- 1 liter = 0.264 gallons

We have to write each conversion as a quotient:

We must write each conversion in a way that the liters cancel out, then the gallons cancel out in order to obtain the result in barrels.

So, 12 liters is equal to 0.075 barrels.

We can change a hydrate into anhydrous compound by heating it to drive off the water (dehydrate )

Correct choice is therefore anhydrous . Option 2 .

10.51 (g/cm³) is the Average Density of the given data.

Average Density = 10.34+10.58+10.62+10.51÷4

Average Density=42.05/4

Average Density=10.51

Density is defined as a material substance's mass per unit volume. Density is described by the equation d = M/V, where d stands for density, M for mass, and V for volume. Grams per cubic centimeter is the unit of measurement for density.

For instance, compared to Earth's density of 5.51 grams, water has a density of 1 grams per cubic centimeter. Another way to express density is in kilograms per cubic meter (in meter-kilogram-second or SI units)

It is easy to determine the relationship between mass and volume using density. For instance, the formula for determining a body's mass is M = Vd, while the formula for determining a body's volume is V = M/d.

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In this stoichiometry question, we have the following reaction:

4 Al + 3 N2 -> 2 Al2N3

We have:

2.5 grams of N2

We want to know how much Al we need in order to react with 2.5 grams of N2, and in order to do that, we need to find out how many moles of N2 we have in 2.5 grams, we will be using its molar mass, 28g/mol to do it:

28g = 1 mol

2.5g = x moles

28x = 2.5

x = 2.5/28

x = 0.089 moles of N2 in 2.5 grams

Now according to the molar ratio, we have 4 moles of Al for every 3 moles of N2, therefore, if we have 0.089 moles of N2:

4 Al = 3 N2

x Al = 0.089 N2

x = 0.119 moles of Al

Now we can find the mass needed, using the number of moles, 0.119 moles, and also the molar mass, 27g/mol:

27g = 1 mol

x grams = 0.119 moles of Al

x = 3.2 grams of Al is required

Answer is 3.2 grams

Answer:

Phosphate ion only

Explanation:

Here, we want to get the polyatomic ions with a charge of -3

What we have to do here is to write the polyatomic ions and their formula

We have this as follows:

From the above, the polyatomic ions with a charge of -3 is the Phosphate ion only

To determine the mass of the number of atoms, the first step is to convert this number of atoms to moles using Avogadro's number:

Convert this amount of moles to grams using the molecular weight of Arsenic:

It means that the answer is 3.8199g.

Answer:

The factor of change is 1/4.

Explanation:

Since in this case we have a constant temperature, the changes in the pressure will affect the volume like the Boyle's Law formula explains:

To find the change of the sample volume, let's replace the initial pressure (P1) with A, and let's increase the pressure (P2) 4x:

So, the factor of change is 1/4.

To determine the mass percentage of each element in the compounds, we are going to use the following formula:

In the case of the last element of each compound, we are going to make the subtraction of 100% minus the addition of the other elements.

We are going to assume that we have 1 mole of every substance.

First, we have to determine the molecular weight of each substance:

a. NH3

If we have 1 mole of ammonia, then we have 17 g. Then, we can calculate the nitrogen mass percentage as follows:

Then, we make the subtraction to determine the hydrogen percentage:

Then, the answer is that the nitrogen mass percentage equals 82.4% and the hydrogen one is 17.6%

b. Na2CO3

We repeat the same steps that we did with the ammonia.

Then, the answer is that the sodium mass percentage equals 43.4%, the carbon is 11.3%, and the oxygen one is 45.3%

Compared to the normal freezing and boiling point of water, adding sugar to water will result in:

D. Lower freezing point and higher boiling point.

The chosen answer is the correct one.

This is explained as follows:

When we add sugar to water we form a solution, water molecules sorroud sugar molecules interacting with them electrostatically, this results in less interaction between water molecules and a lower amount of energy needed for them to maintain their freedom, so they will stay in liquid state at lower temperatures.

On the other hand, when we take the solution to its boiling point we will see that it is higher than that of pure water. This happens because the interaction between water and sugar molecules makes it harder for water molecules to escape the liquid phase, increasing the boiling temperature.

Identify Bo compounds as the quantitatively by the green coloration

The presence of boron compound can be detected quantitatively by green coloration they impart to the flame of an ordinary laboratory or bunsen burner and also boron can be identified by using spectrophotometric and colorimetric method and the chemical properties of boron are more similar to carbon and silicon than element of its own group although boron is the more electron dificient

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Explanation: Collagative properties are characteristics of a solution that is dependent on the ratio of solute particles to to solvent particles.

Answer: D) Melting point acceleration.

Given the balanced equation :

• 2,NaOH + H2S04 → Na2S04 + ,2,H20

2 : 1 :1 :2

We can see that 2 moles of NaOH produces 2 moles of H20

To identify the limiting reactant, we use the coefficients of the reaction:

As you can see, we have 1.79 moles of NO, but we need 1.86 moles of NO according to the reaction. For this reason, NO is the limiting reactant since we need more than what we have.

Explanation

Given:

i = 2

boiling point of water = 100 'C

KCl boiling point = 102.5 'C

Required: Molality (m) of the solution

Solution

DT = i x Kb x m

DT = 102.5-100 = 2.5 'C

DT = i x Kb x m

2.5 = 2 x 0.512 x m

2.5 = 1.024m

molality = 2.44 m

Answer

Molality = 2.44 m

3 states

Matter can exist in three forms namely;

• Solid state

• Liquid state

• Gaseous state

From the given scenario, water is known to exist as ice cubes (which is the solid state). Also since the water Aon her skin evaporated the water changed to steam (gaseous state) in this case.

Also note that the ice cubes melted in the glass. This melted ice changes to liquid ,at this point. Therefore, we can conclude that the water in the scenario exists in three forms (Liquid, Solid and Gas).

We can find the number of moles of a compound based on their number of atoms using Avogadro's number which says that there are 6.022 x 10^(23) atoms in 1 mol.

The answer is that there are 69744.27 moles of zinc in 4.2 x 10^(28) atoms of zinc.

The phase diagram of a substance is given below. This substance is a solid  at 10 °C and 1 atm.

When a material switches from one state of matter to another, a phase transition takes place. Matter exists in three basic states: liquid, solid, and gas. The many phases of a material are shown on a phase diagram using numerous variables, most frequently temperature and pressure. The figure may be used to illustrate how altering these factors impacts a substance's state of matter.

The fusion (melting or freezing) curve, which depicts the change from a liquid to a solid state. The curve that depicts the change from a gaseous to a liquid state is called the vaporization (or condensation) curve. The sublimation (or deposition) curve depicts the change from a gaseous to a solid state.

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Answer

C. The increased kinetic energy causes the particles to move faster, causing more collisions.

Explanation

An increased temperature typically causes a reaction to occur faster by raising the average kinetic energy of the reactant molecules.

Therefore, a greater proportion of molecules will have the minimum energy necessary for an effective collision.

The correct answer is option C. The increased kinetic energy causes the particles to move faster, causing more collisions.

Explanation:

Electronegativity corresponds to the ability of the nucleus of an atom to attract the electrons involved in a chemical bond.

Elements belonging to the same period (same row) of the Periodic Table, we will see that electronegativity increases from left to right.

Elements belonging to the same group (same column), electronegativity increases from bottom to top.

The element among sulfur, nitrogen, silicon and chlorine that has the higher eletronegativity is chlorine.

Answer: d. chlorine

ANSWER

EXPLANATION

Given information

The mass of calcium bromide is 5.0 grams

Follow the steps below to find the mole of calcium bromide

Step1: Write the formula for calculating mole

Recall, that the molar mass of calcium bromide is 199.89 g/mol

Step 2: Substitute the given data into the formula in step 1

The empirical formulas refer to the formulas where the ratios are the simplest, while the molecular formula shows the number of each type of atom.

In this case, we have a molecular formula and we just have to simplify the number to get the empirical formula. Divide each number by 2.

Therefore, the empirical formula is

Nickel has 28 electrons, its electron configuration is:

Ni2+ has lost 2 electrons, which means that the resulting configuration would be:

Nevertheless, since 4s electrons are further from the nucleus, they are lost resulting in a more stable ion, then, the actual configuration of Ni2+ is:

It means that this ion has 16 valence electrons.

The molar mass of sodium chloride is 58.44 g/mol.

The molar mass of chlorine is 35.45 g/mol.

To find the percent, divide the molar masses.

Therefore, the percent of chlorine is 61%.