Which is a compound?
A. smog
B. sea water
C. air
D. magnesium
E. salt

Boiling chips should not be added to a boiling liquid because they can disrupt the smooth flow of vapor bubbles, leading to boiling over or splattering of the liquid. This can pose a safety hazard and create a messy situation.

During a distillation, the thermometer should be positioned in the distillation head so that it is in contact with the vapors being produced, but not in direct contact with the boiling liquid.

An increase in the heating rate during a distillation will result in a higher boiling temperature. This is because the higher heating rate will increase the vapor pressure of the liquid, causing it to boil at a higher temperature.

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Answer:

distillation, collecting and cooling the steam

Explanation:

solution of potassium chlorate,

K

C

I

O

3

, has 20 grams of the salt dissolved in 100 grams of water at 70 C. Approximately how many more grams of the salt can be added to the solution before reaching the saturation point?

Answer:

Baking powder is a dry chemical leavening agent, a mixture of a carbonate or bicarbonate and a weak acid. Because carbon dioxide is released at a faster rate through the acid-base reaction than through fermentation.

Baking powder is a mixture because it contains both sodium hydrogen phosphate and potassium hydrogen tartrate (two different compounds.)

The approximate radius of the circle the proton will make R =10 μm and the proton will experience an initial force towards the north.

The radius of the circle that the proton will make can be found using the equation for the radius of the circular path of a charged particle in a uniform magnetic field:
r = (mv)/(qB)
where r is the radius of the circle, m is the mass of the proton, v is its velocity, q is its charge, and B is the magnetic field strength.
Substituting the given values, we have:

r= \((mpv)/(qB) = (1.7x10^-27 kg)(((2K.E.)/mp))/(1.6x10^-19 C)(1.0 T)2\)\((mpv)/(qB) = (1.7x10^-27 kg)(((2K.E.)/mp))/(1.6x10^-19 C)(1.0 T)2\)
r = \(9.29x10^-5\sqrt{x}\) meters or 92.9 micrometers (approximately)

Therefore, the approximate radius of the circle the proton will make is

R = 10 μm.

To determine the direction of the force experienced by the proton, we can use the right-hand rule. If we point our thumb in the direction of the proton's velocity (due east), and our fingers in the direction of the magnetic field (upwards), then the force on the proton will be perpendicular to both and will point towards either the north or the south.

In this case, using the right-hand rule, we can see that the force on the proton will be directed towards the north. Therefore, the proton will experience an initial force towards the north.

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Answer:

Sn (s) + 2 Cl2 (g) → SnCl4 (l)

This is an oxidation-reduction (redox) reaction:

4 Cl0 + 4 e- → 4 Cl-I

(reduction)

Sn0 - 4 e- → SnIV

(oxidation)

Cl2 is an oxidizing agent, Sn is a reducing agent.

Reactants:

Sn

Names: Tin source: wikidata, accessed: 2019-09-07source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Sn source: wikidata, accessed: 2019-09-07, Element 50 source: wikidata, accessed: 2019-09-07

Appearance: White crystalline powder source: ICSC, accessed: 2019-09-04; Gray to almost silver-white, ductile, malleable, lustrous solid. source: NIOSH NPG, accessed: 2019-09-02

Cl2

Names: Chlorine source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Molecular chlorine source: NIOSH NPG, accessed: 2019-09-02

Appearance: Greenish-yellow compressed liquefied gas with pungent odour source: ICSC, accessed: 2019-09-04; Greenish-yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.] source: NIOSH NPG, accessed: 2019-09-02

Products:

SnCl4 – Tetrachlorostannane source: wikipedia, accessed: 2019-09-28source: wikidata, accessed: 2019-09-02, Tin tetrachloride source: wikipedia, accessed: 2019-09-28source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Tin(IV) chloride source: wikipedia, accessed: 2019-09-28

Other names: Stannic chloride source: wikipedia, accessed: 2019-09-28source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Tin(iv) chloride (anhydrous) source: ICSC, accessed: 2019-09-04

Appearance: Colorless to slightly yellow fuming liquid source: wikipedia, accessed: 2019-09-28; Colourless or slightly yellow fuming liquid with pungent odour source: ICSC, accessed: 2019-09-04

Answer:

Permeable.

Explanation:

Most sediments of a chalky quality are permeable.

The mass change in grams accompanying the formation of 1 mol Cu and 1 mol H₂O in the following reaction is:

CuO(s) + H₂(g) → Cu(s) + H₂O(g)  ΔH° = +84.5kJ

63.55 grams for Cu and 18.02 grams for H₂O.

To determine the mass change accompanying the formation of 1 mol of Cu and 1 mol of H₂O in the given reaction, we need to consider the stoichiometry of the reaction and the molar masses of the substances involved.

From the balanced chemical equation:

CuO(s) + H₂(g) → Cu(s) + H₂O(g)

We can see that the reaction consumes 1 mol of CuO and 1 mol of H₂ and produces 1 mol of Cu and 1 mol of H₂O.

Let's calculate the molar mass of Cu using the atomic masses:

Molar mass of Cu = 63.55 g/mol

The formation of 1 mol of Cu will have a mass change of 63.55 grams.

Next, let's calculate the molar mass of H₂O:

Molar mass of H₂O = (2 * 1.01 g/mol for hydrogen) + (16.00 g/mol for oxygen)

= 18.02 g/mol

The formation of 1 mol of H₂O will have a mass change of 18.02 grams.

Therefore, the mass change accompanying the formation of 1 mol of Cu and 1 mol of H₂O in the given reaction is 63.55 grams for Cu and 18.02 grams for H₂O.

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The total amount of heat : 225.704 kJ

Heat of vaporization(ΔH vap) : heat needed to vaporize 1 mole of water , units : kJ/mol

For water at boiling point (100 °C) : ΔH vap = 40.66 kj/mol

mole of 100 g water :

\(\tt \dfrac{100}{18.015}=5.551\)

so total Heat :

\(\tt 40.66\times 5.551=225.704~kJ\)

Answer:

This question is incomplete

Explanation:

This question is incomplete. However, Jet fuels are produced/designed in such a way that they can absorb cold and become as cold as -47 °C; this is because of the cold temperature in which the jet flies. When the fuel absorbs this coldness, the movement of the molecules in the fuel begins to reduce (just like in every other substance undergoing coolness) and keeps reducing as the temperature keeps dropping. Ordinarily, if this temperature reduces to a particular point (freezing point), the movement of the molecules will stop totally leading to the fuel solidifying/freezing (which has happened sometime before the production of more improved fuel with lower temperature that is been used now).

NOTE: There are some perceived spelling errors in the question. For example, it appears the "moluses" is actually "molecules", "befire tge" is "before the" and "tenoerature" is "temperature".

Answer:

B. Took the test lol

Explanation:

hope this helps

Fatigue crack initiation typically occurs under dynamic cyclic loading conditions.

The correct option is:

a) Wear rate decreases by increasing the material hardness

Increasing the hardness of a material generally improves its resistance to wear.

Harder materials have better wear resistance because they can withstand greater forces and are less prone to surface deformation, abrasion, and material removal during sliding or rubbing contact.

The correct option is:

c) Dynamic cyclic load

Fatigue crack initiation typically occurs under dynamic cyclic loading conditions.

When a material is subjected to repeated loading and unloading cycles, especially with high-stress amplitudes, it can lead to the initiation and propagation of fatigue cracks over time.

The cyclic nature of the load induces progressive damage and eventual failure due to the accumulation of microstructural changes and crack growth.

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Work is defined as the ratio of pressure (p) to volume (V) during a change in volume for a gas. The work is the region under the curve that depicts how the state changes from State 1 to State 2 on a graph of pressure vs volume.

Because of this, a gas's impact on the environment is negative. W=PV W = P V is the formula for determining work given pressure (P) and volume change (V). In order to match the effort a system does on its surroundings, the work a gas does when expanding against an external pressure is negative. On the other hand, when a gas is compressed by an external pressure, V is equal to zero and the work is positive since the environment is exerting force on the system.

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Based on the standard heat of formation of aluminium oxide, the heat of the reaction of the decomposition of aluminium oxide is +3339.6 kJ

The heat or enthalpy of a reaction is the amount of heat evolved or absorbed when reactant molecules when reactants form products.

Considering the given reaction:

The heat of formation of aluminum oxide is -1669.8 kJ/mol.

The heat of the reaction of the decomposition of aluminium oxide is calculated as follows:

Heat of reaction = Heat of formation of products - Heat of formation of reactants

Heat of reaction = {3 × ΔHf°O2 (g) + 2 × ΔHf° Al(s)} - 2 × ΔHf° Al2O3 (s)

Since the standard enthalpy of formation,ΔHf°, of an element in its most stable form is equal to zero.

ΔH°rxn = (3 × 0 + 2 × 0) - 2 × -1669.8 kJ/

ΔH°rxn = +3339.6 kJ

Therefore, the heat of the reaction of the decomposition of aluminium oxide is +3339.6 kJ

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Answer:

B limestone

Explanation:

Answer:

3500000 try this i think it's right not sure

Explanation:

Calories are used to define the unit of energy given by the consumed food in the body. A dinner containing 3.5x10⁶ joules has calories of 836.52 Cal.

Calories have been defined as the amount of energy given by the food and its various components, including carbohydrates, proteins, fats, fibers, etc. The stored calories more than the use of those calories results in their storage in the adipose tissues which may lead to obesity.

The food energy from joules can be converted into large calories (Cal) as it is the required amount to raise 1°C of the temperature of a 1 kg substance at 1 atm pressure.

The conversion is done as:

1 J = 0.000239 Cal

3500000 joules = 836.520 Cal

Therefore, the energy of dinner in calories is 836.520 Cal.

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Answer:

0.116 moles of ammonia can be produced from the reaction of 4.0 liters of hydrogen at 50.0°C and 1.2atm of pressure with excess nitrogen.

Explanation:

The balanced chemical equation for the reaction of hydrogen and nitrogen to form ammonia is:

N2(g) + 3H2(g) → 2NH3(g)

To determine how many moles of ammonia can be produced from the reaction of 4.0 liters of hydrogen at 50.0°C and 1.2atm of pressure with excess nitrogen, we need to 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 convert the volume of hydrogen gas to moles using the ideal gas law equation:

n = PV/RT

where P is the pressure in atm, V is the volume in liters, R is the gas constant (0.0821 L·atm/mol·K), and T is the temperature in Kelvin.

n = (1.2 atm)(4.0 L)/(0.0821 L·atm/mol·K)(50.0°C + 273) = 0.174 mol H2

Since there is excess nitrogen, all of the hydrogen will react to form ammonia. Using the mole ratio between NH3 and H2 from the balanced chemical equation:

2 mol NH3 / 3 mol H2

we can calculate how many moles of NH3 will be produced:

n(NH3) = (0.174 mol H2) × (2 mol NH3 / 3 mol H2) = 0.116 mol NH3

Therefore, 0.116 moles of ammonia can be produced from the reaction of 4.0 liters of hydrogen at 50.0°C and 1.2atm of pressure with excess nitrogen.

To solve this question we have to convert the given mass of litium hydroxide to moles using the molecular mass of this compound:

Now, use the stoichiometric ratio given by the chemical equation:

Finally, convert the moles of CO₂ to g using the molecular mass of CO₂:

The mass of carbon dioxide required to react with 80.5g of LiOH is 73.92g.

0.045 lbs is equal to 20.338g. Grams (g) are a unit of measurement for mass in the metric system, while pounds (lbs) are a unit of measurement for mass in the imperial system.

To convert 0.045 lbs to grams, we need to first convert lbs to kilograms, then convert kilograms to grams.

Given 1 kg = 2.20462 lbs

1. To convert lbs to kilograms, divide the lbs value by 2.20462.

0.045 lbs / 2.20462 = 0.020338 kg

2. To convert kilograms to grams, multiply the kilograms value by 1000.

0.020338 kg * 1000 = 20.338 g

Therefore, 0.045 lbs is equal to 20.338 g.

Both units are used to measure the mass of objects, but they are not interchangeable. 1 pound is equal to 453.59237 grams.

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The benefit of substrate channeling in the PDH complex is the efficient transfer of intermediates between the catalytic sites, allowing for faster reaction rates and reduced side reactions.

Substrate channeling refers to the process where intermediates of a metabolic pathway are channeled directly from one enzyme to another, without being released into the bulk solvent. In the case of the PDH complex, substrate channeling provides several benefits.

One major benefit is the enhanced efficiency of the catalytic reactions. By keeping the intermediates within a confined channel, the chances of diffusion and random encounters with other molecules in the cell are minimized. This allows for faster reaction rates as the intermediates are readily available for the subsequent enzyme to continue the catalytic process. Substrate channeling also reduces the loss of intermediates to side reactions or degradation, ensuring that the desired metabolic pathway is efficiently followed.

The molecular mechanism of substrate channeling in the PDH complex involves the physical association of the three enzymes (E1, E2, and E3) along with the five cofactors within a multi-enzyme complex. The active sites of the enzymes are arranged in close proximity, forming a channel or tunnel through which the intermediates can pass directly. The binding and release of intermediates are coordinated between the enzymes, allowing for the smooth transfer of the intermediates from one active site to another.

This spatial organization and coordination of enzymatic reactions within the PDH complex contribute to the overall efficiency and regulation of the metabolic pathway. Substrate channeling ensures that the intermediates are rapidly and accurately shuttled between the catalytic sites, promoting the smooth flow of the pyruvate decarboxylation process and minimizing the loss of intermediates.

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The most stable carbocation is formed by t-butyl bromide alkyl halide. Carbocation stability usually correlates with the number of methyl groups attached to the core carbon.

Chemicals called halides also include halogens. There are halides in nature, some of which are necessary to sustain human existence, such as salts and acids. Halides are found in minerals, organisms and plants. Table salt or NaCl is the most common halide.

while alkyl halide is halide that attach to alkyl group

Sodium, hydrochloride, and hydrochloride form a group of minerals known as halides. Minerals in this category include crystalline rock salts, sylvites, and carnallites, which contain only chlorides of important petrogens. Rock salt, also known as rock salt (NaCl), is the crystalline form of sodium chloride.

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In a reaction, oxidation is shown by an increase in the number of oxidations, while reduction is indicated by a drop.

By assuming that all bindings to the atoms in molecules are ionic, we may determine redox processes using the oxidation numbers that are ascribed to the atoms in those molecules. An increase in the number of oxidations during a reaction indicates oxidation, while a decrease indicates reduction.

Make a net ionic equation for the reaction, then divide it into half-reactions. The substance that loses electrons is also the reducing agent and is oxidizing. The thing that gets electrons is being reduced and is the thing that oxidizes.

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Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question we have

mass = 75 × 2.86

We have the final answer as

Hope this helps you

Answer:

What are the choices? :)

Explanation:

Answer:

Fluorine

Explanation:

Fluorine is the most electronegative element.

let me know if this is wrong :)

Answer:

3.125g/mol

Explanation:

To find the molar mass of the gas, we need to initially find the number of moles (n) contained in the gas. To find the number of moles, we use the general gas law whose equation is:

PV=nRT

Where; P= Pressure

V= Volume occupied by gas

n= number of moles

R= general gas constant

(0.0821 L atm mol/K)

T= absolute temperature

According to the question; P= 2.0atm, V= 2.0L, n= ?, T= 298K

To find n, we make it the subject of the formula:

n= PV/RT

n= 2.0 × 2.0 / 0.0821 × 298

n= 4/ 24.4658

n= 0.16mol

If number of moles (n) of the gas is 0.16mol and it weighs 0.500g, its molar mass can be found using:

number of moles (n) = mass (g) / molar mass

Making MM subject of the formula;

molar mass = mass / number of moles

MM= 0.500/0.16

MM= 3.125

Hence, the molar mass of the gas is 3.125g/mol.

Answer:

Its D. Water

Explanation:

hope this helps :)

The molar mass of methylammonium bromide is 111u.

The molar mass is defined as the mass per unit amount of substance of a given chemical entity.

Multiply the atomic weight (from the periodic table) of each element by the number of atoms of that element present in the compound.

Add it all together and put units of grams/mole after the number.

Atomic weight of H is 1u

Atomic weight of N is  14u

Atomic weight of C is  12u

Atomic weight of Br is  79u

Calculating molar mass of  \(2H_3NCH_3Br\) =2(1 x3+ 14+12+ 1 x 3 +79) = 111u

Hence, the molar mass of methylammonium bromide is 111u.

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175 ml of a 1.6 m solution of KCl is diluted to a new volume of 1.0 L. The new concentration of the solution is 0.28 m KCl.

Hence, Option (B) is correct answer.

Concentration is defined as the measure of how much substance there is mixed with another substance.

To find the concentration use the dilution formula

C₁V₁ = C₂V₂

where,

C₁ = Concentration of starting solution

C₂ = Concentration of final solution

V₁ = Volume of the starting solution

V₂ = Volume of the final solution

Now put the values in above formula we get

C₁V₁ = C₂V₂

1.6 × 0.175 = C₂ × 1.0

0.28 = C₂ × 1.0

C₂ = 0.28

Thus from the above conclusion we can say that 175 ml of a 1.6 m solution of KCl is diluted to a new volume of 1.0 L. The new concentration of the solution is 0.28 m KCl.

Hence, Option (B) is correct answer.

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Answer:

C

Explanation:

Because the car is moving forward with an increasing velocity, it has a positive acceleration.

Answer:

Explanation:

Question

Which of the following has a positive acceleration?

A. A car sits at rest at a stop sign.

B. A car is slowing down as it approaches a traffic light. a

C. A car increases its speed moving forward.

D. A car is in cruise control at a constant speed.

Positive acceleration is when there is a positive increase in velocity over time.

C.  is the only choice that shows a positive increase in velocity over time.    

A. and D. show NO change in velocity, while B. shows a negative change.