the combustion of 40.5 mg of a compound extracted from the bark of the sassafras tree and known to contain c, h, and o produces 11.0 mg co2 and 22.5 mg of h2o. the molar mass of the compound is 162 g.mol. what is the molecular formula?

Explanation:

she could waited for the saturated vapour pressure to equal the prevailing atmospheric pressure

ergo boiling to take place seeing as she had gotten the first indication that boiling had started

Answer:

The electronegativity difference of the atoms in the bond.

Explanation:

Carbon is electropositive while Oxygen is highly electronegative, hence highly polar due to strong intermolecular forces.

The molecule is not symmetrical because it's dipole moments don't cancel out.

Answer:

"A"

Explanation:

The magnetic dipole axis of the earth is tilted about 11½° from the rotation axis. This means the magnetic north pole and the geographic north pole are not in the same place. ...

They are also not the sam ehtings :

Magnetic axis is the straight line joining the two poles of a magnet (as the magnetic poles of the earth)

Rotational axis i think is the straight line that joines the north and the south pole of the  .earth .... NOTE: The earth is a bit tilted....

look at the daigram for reference.

The rotational axis of the Earth and its magnetic axis are separated by 11.5 degrees and are not one and the same.

The rotational axis is an imaginary line or axis through which any object rotates and revolves.

The angular momentum vector of the object is divided by the angular momentum magnitude to find the rotational axis of an object.

The rotational axis of the earth is 23.5 degrees.

Thus, the correct option is A.

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P,T,Y refers to the set of points which are collinear and is therefore denoted as option C.

This is commonly used in geometry and refers to the set of points which lie on the same straight line and are always close to each other when compared to other points. It is possible for them to appear on different planes only and the value by the triangle from the three points is usually zero.

In the example give, only P,T and Y are the points which lie on the same line while other options have points which lie on different lines thereby making them incorrect.

This is therefore the reason why option C was chosen as the most appropriate choice.

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% composition = Ar/Mr x 100%

MM (molar mass) ZnSO₄ = 161 g/mol

AM (atomic mass) Zn = 65.38 g/mol

% Zn = 65.38/161 x 100% = 40.6%

AM (atomic mass) S = 32 g/mol

% Zn = 32/161 x 100% = 19.9%

AM (atomic mass) O = 16 g/mol

% Zn = 4.16/161 x 100% = 39.6%

Answer:

Conduction is the transfer of thermal energy through direct contact. Convection is the transfer of thermal energy through the movement of a liquid or gas. Radiation is the transfer of thermal energy through thermal emission.

Answer:

A. Na+ OH-

Explanation:

positive and negative ions form bonds because positive and negative attract

The current in a toaster that has a heating element of 14 ohms when connected to a 120-V outlet is calculated to be 8.57 Ampere.

Current is the flow of electrons, but current and electron flow in the opposite direction. The quantity of current in the circuit is determined by the voltage and the resistance in the circuit against current flow.

In direct current, the voltage is constant, and the electricity travels in a definite direction.

Given V = 120-V,

Resistance = 14 ohms

To calculate the current in the toaster, we use the formula

I = V/R

I= 120-V/14 ohms

I = 8.57 Ampere.

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The current in a toaster with a heating element of 14 ohms connected to a 120-V outlet is 8.57 amperes. Ohm's law formula, states that current equals voltage divided by resistance, which can be used.

The Ohm's law formula is used to calculate the current in a toaster that has a heating element of 14 ohms when connected to a 120-V outlet. According to Ohm's law, the current in a circuit is equal to the voltage divided by the resistance.
The formula is as follows: I = V/R, where I represents the current in amperes, V represents the voltage in volts, and R represents the resistance in ohms. If we substitute the values given in the question into the formula, we get: I = 120 V / 14 Ω = 8.57 A.
Thus, the current in a toaster with a heating element of 14 ohms connected to a 120-V outlet is 8.57 amperes.

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Answer: Silver

Explanation:

Answer:

SILVERRRRRRRRRRR

Explanation:

Therefore, if 7.5 g of O2 are utilized, the theoretical yield of SO2 is 10.99 g.

Divide the mass of the reactant by the molecular weight to get the mass per mole. As an alternative, we can multiply the liquid solution's density in grams per milliliter by the amount of reactant solution in milliliters. Next, divide the result by the reactant's molar mass.

The mole ratio of O2 to SO2 in the balanced chemical equation must be determined using stoichiometry in order to compute the theoretical yield of SO2:

2H2S+3O2->2SO2+2 H2O

We can see from the equation that 3 moles of O2 and 2 moles of SO2 react. O2 and SO2 have a mole ratio of 3:1 as a result.

Given that 7.5 g of O2 are used, we can convert this amount to moles using the molar mass of O2 as follows:

7.5 g O2 x (1 mol O2 / 32 g O2) = 0.2344 mol O2

Using the mole ratio, we can calculate the theoretical yield of SO2:

0.2344 mol O2 x (2 mol SO2 / 3 mol O2) x (64.06 g SO2 / 1 mol SO2) = 10.99 g SO2.

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Moles are the unit of measurement that estimates the amount of the substance in a sample. It directly compares the amounts of substances. Thus, option c is correct.

Moles are said to be the SI unit to estimate the number of substances like atoms, molecules, ions, etc., in a sample. It is used to measure the elementary entities that are small in size.

It is abbreviated as mol and is equivalent to 6.02214076 × 10²³ particles (Avogadro number). It can be calculated by mass and the molar mass of the substance and is shown as,

Moles (n) = mass ÷ molar mass

Where mass is given in grams and molar mass in grams/ mol.

The moles are used to estimate the molarity and are also used in the ideal gas equation. The moles will be more in the substance with less molar mass and vice versa.

Therefore, option c. moles directly compares the amounts of substances.

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Answer:

B. electrons and protons.

Explanation:

In an electrically neutral atom of any element, there are equal number of protons and electrons in the atom.

Protons are the positively charged particles in an atom.

Electrons are the negatively charged particles within the atom.

  When the number of protons and electrons are the same or equal, the atom is neutral.

But when there is an imbalance, an ion results.

Answer:

HCl

Explanation:

1 hydrogen 1 chlorine

Answer:

a. 5 8/100 is equivalent to $ 5.08.

Explanation:

i hope this helps :)

Answer:

Floating ice can insulate bodies of water. Answer: b. Discuss how a high specific heat helps to buffer temperature for organisms. Water's high specific heat is important to life because...

Explanation:

Answer:

42.2075 grams

Explanation:

H bonded covalently to O, N or F is required for a substance to experience hydrogen bonding among its own molecules.

It is necessary that the molecules have an atom of H attached to a highly electronegative atom such as N, O, F and also the molecule had to have a solitary pair of electrons more specifically in a small highly electronegative atom such as N, O, F.

The hydrogen bond is responsible for many of the anomalous physical and chemical properties of compound of N, O, F.

Hydrogen bonds is found within intermolecular forces, which are type of attractive forces that exist between molecules of covalent substances.

Such bonds are weaker that an ionic bond or covalent bond but stronger than Vander Waals forces.

One atom of the pair (the donor) generally a Fluorine (F), Nitrogen (N) or Oxygen (O) atom is covalently bonded to a hydrogen atom ( -FH, -NH, -OH),

whose electrons it shares unequally, its high electron affinity causes the hydrogen to take on a slight positive charge.

So, In order for a substance to experience hydrogen bonding among its own molecules, H must be covalently bound to O, N, or F.

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A cube of gold weighing 185g is heated from 20.0°C to some higher temperature, with the absorption of 225 joules of heat. The specific heat of gold is 0.030 J/g°C. 60.5°C was the final temperature of the gold.

Gold has the chemical symbol Au (from Latin: aurum) as well as the atomic number 79. As a result, it is one among the highest atomic number elements found in nature.

In its pure state, it is a brilliant, somewhat orange-yellow, dense, soft, malleable, extremely ductile metal. Gold is indeed a transition metal as well as a group 11 element chemically.

225 = 185 × 0.030×(final temperature- 20.0)

225 =5.55×(final temperature- 20.0)

225/ 5.55 = final temperature- 20.0

60.5 = final temperature

Therefore, 60.5°C was the final temperature of the gold.

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The molar mass of the unknown nonelectrolyte compound is

Using the formula;

∆T = K m i

Where;

K = freezing point depression constant

m = molality of the solution

i = Van't Hoft factor

Note that i = 1 since the compound is a nonelectrolyte.

To find molality;

Number of moles = 0.520 g/Molar mass

Let the molar mass of the unknown compound be MM

Number of moles = 0.520 g/MM

Number of kilograms of solvent = 4.12 g/1000 = 0.00412 Kg

Molality = 0.520 g/MM * 1/0.00412 Kg

Freezing point depression is 4.20 °C

To find the molar mass of the compound;

4.20 °C = 3.90 °C/m *  0.520 g/MM * 1/0.00412 Kg

4.20  = 492.23/MM

MM = 492.23/4.20

MM = 117.19 g/mol

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Answer:

The solution turns purple because ammonia is a base.

The solution turned red.

Ammonia gas is neutral, but ammonia solution ( ammonium hydroxide ) is a base.

Adding vinegar to ammonia suppresses its dissociation hence decrease in hydroxyl ion concentration.

If more ammonia is added to the solution, the pink color re-appears.

Answer:

4-5 days

Explanation:

Answer:

Earthquakes occur on faults - strike-slip earthquakes occur on strike-slip faults, normal earthquakes occur on normal faults, and thrust earthquakes occur on thrust or reverse faults. I hope this helps you :)

The degree to which electricity passes through a substance is the best description of conductivity. Option D.

What is conductivity?

Conductivity (also called specific conductance) is a measure of how easily electricity flows through a substance. The higher the conductivity, the more easily electricity can pass through the substance.

This is why metals, such as copper and aluminum, are often used as conductors in electrical wiring and other applications.

In contrast, substances with low conductivity, such as rubber and plastic, are often used as insulators to prevent the flow of electricity.

The SI unit of conductivity is Siemens per meter (S/m).

Hence, Option D is the correct answer

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Answer:

Fe2(SO4)3 + 3BaCl2 → 2FeCl3 + 3BaSO4

Prior to giving nitroglycerin, an additional diagnostic test that is often indicated is an electrocardiogram (ECG/EKG).

An electrocardiogram (ECG or EKG) is a diagnostic test that measures the electrical activity of the heart. It is a non-invasive procedure that involves attaching electrodes to the patient's chest, arms, and legs to detect and record the electrical signals produced by the heart.

During an ECG, the electrodes detect the electrical impulses generated by the heart's natural pacemaker, the sinoatrial (SA) node, and the subsequent conduction of these impulses through the heart. The electrical activity is then recorded as a series of waveforms on a graph, which can be interpreted by a healthcare professional.

The ECG provides valuable information about the heart's rhythm, rate, and overall electrical conduction. It helps in diagnosing various cardiac conditions, including abnormal heart rhythms (arrhythmias), heart attacks (myocardial infarction), ischemia (lack of blood flow to the heart), and structural abnormalities.

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Answer:

They breathe

Explanation:

Green main bonding jumper screws that are furnished with residential type panels should be installed in the service panel enclosure.

The main bonding jumper is a conductor that connects the noncurrent-carrying metal parts of the electrical system to the grounding electrode system. This connection helps to ensure that the electrical system is properly grounded and that any stray current will be safely directed to the ground.

The main bonding jumper should be installed in the service panel enclosure because this is the central point of the electrical system. All of the noncurrent-carrying metal parts of the electrical system, such as the service panel enclosure, the service entrance cable, and the branch circuit conductors, are connected to the service panel enclosure.

By connecting the main bonding jumper to the service panel enclosure, all of these noncurrent-carrying metal parts are also connected to the grounding electrode system.

The main bonding jumper should be a solid copper conductor with a minimum cross-sectional area of 6 AWG. It should be installed in a way that allows for easy access for inspection and maintenance.

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