A 983. 6 g sample of antimony undergoes a temperature change of +31. 51 °C. The specific heat capacity of antimony is 0. 049 cal/(g·°C). How many calories of heat were transferred by the sample?

The water cycle will be discussed here.

This is defined as the continuous manner in which water is moved within the earth and the atmosphere.'

The water cycle comprises of steps such as:

Humans however disrupt water cycle through the damming of rivers and deforestation.

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The half reaction that should occur at the anode during electrolysis of an aqueous potassium bromide solution is formation of bromine from its ions.

As we know, that anions are negatively charged anions. So, these get oxidised to get stable state at anode. Thus, negative ions will react at anode. Similarly cathode has cations that are positively charged. Thus, reduction will take place at the cathode.

In the electrolysis reaction of aqueous potassium bromide -

KBr -> \( {K}^{+} \) + \( {Br}^{-} \)

In this ionization reaction, the KBr is potassium bromide, \( {K}^{+} \) are potassium ions amd \( {Br}^{-} \) are bromine ions. The negatively charged bromine ions will be oxidised at anode.

2\( {Br}^{-} \) -> \( Br_{2}\) +\( {2e}^{-} \)

Thus, bromine will be formed at anode.

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HCFC refrigerants are as harmful to stratospheric ozone as CFCs. Option B.

Chlorofluorocarbons and hydrochlorofluorocarbons are fully or partially halogenated hydrocarbons containing carbon-hydrogen-chlorine and fluorine produced as volatile derivatives of methane ethane and propane. They are also commonly known under the DuPont brand name Freon.

Due to their hydrogen content, HCFCs are more susceptible to atmospheric decomposition than CFCs. Therefore, HCFCs not only have a low global warming potential, but also a low ozone depletion potential. Most HCFCs are being phased out, but some applications are still in use. For maintenance and firefighting of cooling and air conditioning systems. Learn about HCFCs in general and their uses.

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When potassium iodate is heated in the Bunsen burner flame in the presence of embers, several observations can be made. Initially, the potassium iodate may turn yellowish due to the release of iodine. As the reaction proceeds, the yellow color intensifies, indicating the presence of iodine vapors.

At the end of the reaction in part II, step 2a, the likely identity of the species present is iodine (I2). This is because the heating of potassium iodate (KIO3) in the presence of embers causes the decomposition of the compound, leading to the release of iodine. The equation for this reaction can be represented as:

2KIO3 → 2KCl + 3O2 + I2

Thus, the yellow color and the release of purple or violet fumes indicate the presence of iodine at the end of the reaction.

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Answer:

A- Group 1/1A

Explanation:

In group 1A they are all highly reactive metals, which tarnish when exposed to air.

Based on the data provided, the time it will take the cliff diver to go from 0 mph to 60 mph is 2.68 seconds.

The velocity in mph is first converted to m/s

1 mph = 0.44704 m/s

60 mph = 0.44704 × 60 = 26.8 m/s

Using the equation of motion below:

where

from the data provided:

v = 26.8 m/s

u = 0 m/s

g = 10 m/s^2

t = ?

t = v - u/g

t = 26.8 - 0/ 10

t = 2.68 seconds

Therefore, the time it will take the cliff diver to go from 0 mph to 60 mph is 2.68 seconds.

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The average atomic mass of a sample of enriched uranium is calculated by multiplying the mass of each isotope by its percent abundance and then adding the products together.

The mass of U-235 is 235.04393 amu and its percent abundance is 78.72%.

The mass of U-238 is 238.05078 amu and its percent abundance is 21.28%.

The average atomic mass of the enriched uranium sample is:

(235.04393 amu * 78.72%) + (238.05078 amu * 21.28%) = 238.0287 amu

Therefore, the average atomic mass of the enriched uranium sample is 238.0287 amu.

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Answer:

\(\large \boxed{\text{3. Na}}\)

Explanation:

We can use oxidation numbers to decide which substance is reduced.  

\(\rm 2\stackrel{\hbox{0}}{\hbox{Na}} + 2\stackrel{\hbox{+1}}{\hbox{ H}_{2}}\stackrel{\hbox{-2}}{\hbox{O}}\longrightarrow \rm 2\stackrel{\hbox{+1}}{\hbox{Na}^{+}} + 2\stackrel{\hbox{-2}}{\hbox{O}}\stackrel{\hbox{+1}}{\hbox{H}^{-}} + \stackrel{\hbox{0}}{\hbox{H}_{2}}\)

The oxidation number of Na changes from 0 in Na to +1 in Na⁺.

The oxidation number of H changes from +1 in H₂O to 0 in H₂.

\(\text{An increase in oxidation number is oxidation, so $\large \boxed{\textbf{Na}}$ is the substance oxidized.}\)

1 and 4 are wrong because H₂ and Na⁺ are products.

2. is wrong because there is no H⁺ to be oxidized or reduced.

Answer:

These are called cis-but-2-ene (where the groups are on the same side) or trans-but-2-ene (where they are on opposite sides). Cis-but-2-ene is also known as (Z)-but-2-ene; trans-but-2-ene is also known as (E)-but-2-ene. For an explanation of the two ways of naming these two compounds, follow the link in the box below.

Explanation:

short story about The Blind Date by Jeffrey Archer

Answer:

Ionic and covalent compounds

Explanation:

for a ionic compound to form ions it loses its electrons thus having a ( +) charge

same for covalent compounds to form ions it gains electrons thus having a (-) charge

Answer:

Hydrogen bonding

Explanation:

When Hydrogen interacts with a halogen, it forms hygrogen bonding with that halogen(eg. F, CL, I.... N and O) . Hydrogen bonding is the strongest form of covalent bonding

Answer:

siren wavelength of 0.0068 meters, frequency you hear = less than 5000 Hz

Explanation:

Q.A police siren passes you with a frequency of 5000 Hz. Which correctly describes the sound wave after the police car passes you? The speed of sound is 340 m/s.

(a) siren wavelength of 0.0068 meters, frequency you hear = less than 5000 Hz

(using doppler's effect)

Doppler effect is the apparent difference between the frequency at which sound or light waves leave a source and that at which they reach an observer, caused by the relative motion of the observer and the wave source.

Christian Johann Doppler, an Austrian mathematician, and physicist discovered the Doppler effect in 1842.

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Answer: I think you're supposed to add the protons and neutrons and then that's your answer. Sorry if I'm wrong :/

Explanation:

The weight of aluminum are required to produce 8.70 moles of aluminum chloride is 234.9 g

Aluminum chloride is useful for the treatment of palmar, plantar, and axillary hyperhidrosis.

Aluminum chloride has also been reported to be useful in facial and scalp hyperhidrosis

The balanced chemical equation represents the mole ratio in which the chemicals combine.

In this case, illustrates that 2 mol Al produces 2 mol Al Cl₃, hence these 2 chemicals are in a 1:1 ratio.

Thus, to produce 8.70 mol aluminium chloride, it will require 8.70 mol aluminium.

But this quantity of Al has a mass in grams of

m = n × Mr

   = 8.70 mol × 27g/mol

   = 234.9 g

Hence, The weight of aluminum are required to produce 8.70 moles of aluminum chloride is 234.9 g

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Answer:

Nuclear fusion in stars converts hydrogen into helium in all stars

Answer:

Its B

Explanation: I did the test passed btw

Explanation:

Carbon exhibits several allotropes, which are different forms or structures of the same element. Each allotrope has its own unique physical and chemical properties. The most well-known allotropes of carbon include diamond, graphite, and fullerenes.

1. Diamond: Diamond is the hardest known natural substance. It is composed of carbon atoms arranged in a crystal lattice structure. Each carbon atom is bonded to four other carbon atoms in a tetrahedral arrangement. Diamond has a high melting point, is transparent, and has excellent thermal and electrical conductivity. It is widely used in jewelry, cutting tools, and industrial applications that require its hardness and durability.

2. Graphite: Graphite has a layered structure consisting of carbon atoms arranged in sheets. Within each sheet, carbon atoms are arranged in a hexagonal pattern, forming a two-dimensional network. The layers are held together by weak van der Waals forces, allowing them to slide over each other easily. Graphite is soft and brittle, has a low density, and is a good conductor of electricity. It is commonly used in pencils, lubricants, electrodes, and as a material for graphene production.

3. Fullerenes: Fullerenes are hollow, cage-like structures composed of carbon atoms. The most well-known fullerene is C60, also known as Buckminsterfullerene or Buckyball. It consists of 60 carbon atoms arranged in a spherical shape with pentagonal and hexagonal rings. Fullerenes have unique properties and are being studied for their potential applications in medicine, electronics, and materials science.

Other carbon allotropes include carbon nanotubes and graphene. Carbon nanotubes are cylindrical structures composed of rolled-up graphene sheets. They possess exceptional strength, flexibility, and electrical conductivity, making them valuable in nanotechnology. Graphene is a single layer of graphite, consisting of a two-dimensional hexagonal lattice of carbon atoms. It is incredibly thin, lightweight, and exhibits remarkable mechanical, electrical, and thermal properties. Graphene holds great potential in various fields, including electronics, energy storage, and composite materials.

The different allotropes of carbon highlight the versatility and significance of this element. They offer a range of properties and applications, from the hardness of diamond to the conductivity of graphite and the unique structures of fullerenes, carbon nanotubes, and graphene. The study and understanding of these allotropes contribute to advancements in materials science, nanotechnology, and various industries.

The balanced chemical equation for the standard formation reaction of solid calcium hydroxide CaOH2 is:

                                Ca + O2 + H2  →   Ca(OH)2

The reactant components that are required in the standard states are calcium(Ca), Oxygen(O2), and hydrogen(H2). Oxygen and hydrogen are in their gaseous form and calcium is in solid state.

All of these reactants react to form Ca(OH)2 which is also known as slaked lime.

                           Ca + O2 + H2  →   Ca(OH)2

This chemical equation is balanced because there are 1 Ca, 2 Oxygen atoms and 2 Hydrogen atoms on either sides.

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C/ If Fe is greater than Fg, the negatively charged oil droplet will move freely toward the negatively charged plate.

In the Millikan oil droplet experiment, the negatively charged oil droplets are subjected to an electric field created by the charged plates. The electric force (Fe) acts on the oil droplet in a direction opposite to the gravitational force (Fg). When Fe is greater than Fg, the electric force overcomes the gravitational force, causing the negatively charged oil droplet to experience an upward force. As a result, the oil droplet moves freely upward toward the negatively charged plate.

Option B is incorrect because if Fe is equal to Fg, the forces balance each other, resulting in a stationary droplet. However, the question states that Fe is increased until it is greater than Fg, implying that the droplet is no longer stationary but moves in response to the electric force.

Therefore, option C is the correct answer, as it describes the effect of an electric field on the motion of a negatively charged oil droplet in the Millikan oil droplet experiment.

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Answer:

Frozen Meats – Frozen raw meats that are properly vacuum sealed can be stored in the freezer from 1-3 years depending on the type of meat. However, raw meat that is not vacuum sealed will only last 1-12 months depending on the meat.

Explanation:

hop this helps

Answer: Six months or three years

Explanation: Frozen meats, poultry, and fish can last in the freezer for up to six months and when they are vacuum sealed, frozen meats can stay fresh and free from freezer burn for up to 3 years.

Answer:

b

Explanation:

Because it has developed specific adaptations to protect itself. The beetle's glandular system is designed to keep the two sets of chemicals separate until they are ready to be deployed.

The bombardier beetle has evolved a unique defense mechanism that involves the explosive discharge of a boiling hot liquid containing irritating chemicals. This remarkable ability is made possible by the beetle's specialized anatomy and physiology.

One possible explanation for why the beetle is not harmed by the chemical stores is that it has developed specific adaptations to protect itself. The beetle's glandular system is designed to keep the two sets of chemicals separate until they are ready to be deployed. The two chemical components are stored in separate reservoirs within the beetle's abdomen, typically referred to as the "reactant" and "catalyst" chambers.

The reactant chamber contains hydroquinone, while the catalyst chamber contains hydrogen peroxide and enzymes known as catalases. When the beetle feels threatened, it contracts specific muscles to force the chemicals into a mixing chamber called the "convergent nozzle." This mixing chamber has a thick cuticle lining that protects the beetle's internal tissues from the harmful effects of the chemicals.

Upon mixing, a series of exothermic reactions occur, resulting in the production of boiling hot gas and a spray of irritating chemicals. The reaction is highly exothermic due to the presence of catalases, which rapidly break down the hydrogen peroxide, releasing oxygen and heat. The released gas builds up pressure, which causes the explosive discharge of the hot liquid through the beetle's abdominal opening called the pygidial gland or "nozzle."

The precise mechanisms that prevent the chemicals from prematurely reacting within the beetle's glands are not yet fully understood. However, it is likely that the beetle has evolved various adaptations, such as compartmentalization and specialized enzymes, to ensure the stable storage of the reactive components until they are needed for defense.

Therefore, the bombardier beetle's ability to store and discharge a boiling hot liquid containing irritating chemicals is a result of its unique anatomy and physiological adaptations. It can keep the two sets of chemicals separate until the right moment, and the specific structures and enzymes within its body prevent self-harm. The explosive discharge is caused by exothermic reactions when the chemicals mix, resulting in a remarkable defense mechanism that helps the beetle deter potential threats.

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Answer:

Almost everything in our surroundings represent chemical change

Explanation:

●Rusting of iron in presence of moisture and oxygen.

●Burning of wood.

●Milk becoming curd.

●Formation of caramel from sugar by heating.

●Baking of cookies and cakes.

●Cooking any food.

●Acid-base reaction.

●Digestion of food.

Answer:

1.272 moles are contained in 42 grams of water.

Explanation:

Chemically speaking, ice is the solid form of water and a molecule of water consist of two atoms of hydrogen and an atom of oxygen. Furthermore, atomic masses of hydrogen and oxygen are \(1.008\,\frac{g}{mol}\) and \(15.999\,\frac{g}{mol}\), respectively. A mole is the ratio of current mass of water to molecular weight of water, the latter one is now calculated before computing the amount of moles of water:

\(M = 1.008\,\frac{g}{mol} + 2\cdot \left(15.999\,\frac{g}{mol} \right)\)

\(M = 33.006\,\frac{g}{mol}\)

Finally, the amount of moles contained in 42 grams of ice is:

\(n = \frac{m}{M}\)

\(n = \frac{42\,g}{33.006\,\frac{g}{mol} }\)

\(n = 1.272\,mol\)

1.272 moles are contained in 42 grams of water.

Answer:

Try everything

O 5.94 moles

0 10.0 moles

0 022 x 10^23 moles

0 3.00 moles

Explanation: