1.
A student looked up the naturally occurring isotopes of bromine and found the following information:
50.54% of the naturally occurring isotopes of bromine have an atomic mass of 78.92 amu while 49.46% of the
naturally occurring isotopes of bromine have an atomic mass of 80.92 amu. Calculate the average atomic mass of
bromine. SHOW ALL WORK
​

Answer:

30 electrons

Explanation:

Atoms are made of electrons, protons and neutrons.Protons and neutrons are in the nucleus and electrons are orbiting in energy shells around the nucleus. Atomic number is the number of protons and atomic number is characteristic for the element.

protons are positively charged and electrons are negatively charged. Neutral atoms are when the number of protons and electrons are equal.

Therefore this atoms atomic number is 30 where the number of protons is 30, and in the neutral atom since the number of protons is equal to the number of electrons, the number of electrons is 30

Answer:

Explanation:

Volume occupied by Nitrogen gas at STP = number of moles x 22.4dm³/mol

Number of moles = 1.12moles

Volume = 1.12 x 22.4

Volume at STP = 25.1dm³

Answer:

Some of the causes of eutrophication of seawater are: high concentrations of inorganic matter, sudden changes in temperature, changes in the pH of water and the ability of some organisms to adapt to adverse conditions.

Explanation:

Eutrophication is the process through which lakes, streams, or bays become overloaded with nutrient-rich water. When this occurs, large blooms of algae are produced and when the algae die, microorganisms in the water feed on the remains and consequently use up the available oxygen in the water. This leaves little oxygen for fish and other aquatic animals, resulting in the suffocation of aquatic life. Some of the responsables are:

Eutrophication in seawater is primarily caused by excessive nutrient inputs, particularly nitrogen and phosphorus compounds, from human activities.

These nutrients can come from various sources such as agricultural runoff, sewage discharge, industrial waste, and atmospheric deposition. Here's a breakdown of the main factors contributing to eutrophication in seawater:

Agricultural Runoff: Fertilizers containing nitrogen and phosphorus are commonly used in agricultural practices. When it rains, these nutrients can be washed off the fields and enter nearby water bodies, including the ocean.

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Answer:

The correct answer is thermophiles.

Explanation:

Thermus aquaticus are heat resistant bacteria because these bacteria can survive under adverse environmental conditions like high temperature.

These bacteria belong to one of the most heat-loving groups of extremophiles that are thermophiles. Thermophiles are present in volcanic soil, geysers and around deep-sea vents where the temperature is extremely high.

Thermus aquaticus bacteria is used to manufacture an enzyme called Taq DNA polymerase, which is heat resistant and also an important factor in molecular biology.

Answer:

thermophiles is correct on edge

Explanatio

NO!

Crocodiles do not eat Plovers. They only prey on larger birds like the Maribou Stork, or birds that are not quick enough to realize that they are being stalked.

So yes, A.

It is a mutualistic relationship because both animals benefit; neither animal is harmed. Therefore, the correct option is option A.

Any of a group of multicellular eukaryotic creatures (Kingdom Animalia). It is assumed that they developed separately from unicellular eukaryotes. Animals vary fundamentally from participants in two major kingdoms of eukaryotic organisms, plants (Plantae) and fungus (Mycota), in form and physiology.

In Africa, as the crocodile lies with its mouth open, the plover, or crocodile bird, flies into its mouth and feeds on bits of meat stuck in the crocodile’s teeth. The crocodile does not harm the plover. The plover gets a meal and the crocodile gets his teeth cleaned.  It is a mutualistic relationship because both animals benefit; neither animal is harmed.

Therefore, the correct option is option A.

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1.formation of bubbles

2.change in tempeture

3.hydrogen gas

4.NaOH

Answer:

2Ca + O2 -> 2CaO

0.66 mol CaO

Explanation:

0.33 mol O2(2 mol CaO/1 mol O2) = 0.66 mol CaO

0.33 moles of oxygen would produce 0.33 moles of calcium oxide according to the balanced chemical equation for the reaction of solid calcium with oxygen gas. Additionally, calcium oxide is a very reactive substance with historical uses in lighting.

The reaction of solid calcium (Ca) with oxygen gas (O2) to form solid calcium oxide (CaO) can be represented by the balanced chemical equation: 2Ca + O2 → 2CaO. This equation indicates that 1 mole of oxygen reacts with 2 moles of calcium to produce 2 moles of calcium oxide. If you have 0.33 moles of oxygen available, then using stoichiometric principles, you would also produce 0.33 moles of calcium oxide as the mole ratio of oxygen to calcium oxide is 1:1.

Calcium oxide, also known as quicklime or lime, is very reactive and emits an intense white light when heated to a high temperature. It's interesting to note that blocks of calcium oxide heated by gas flames were used as stage lights in theaters before electricity was available.

Furthermore, calcium hydroxide (Ca(OH)2) can be formed from the reaction of solid calcium oxide with liquid water. However, this step is not necessary to calculate the amount of calcium oxide produced in the original reaction.

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Answer: A sulfur-30

Explanation: for Plato it’s right soo

After 10 seconds sulfur-30 would have decayed more because it has the least half-life.

The half life of an element is the time taken for the element to decay to half of its original mass.

Sulfur-30 would have decayed by 10/1.18 s times. This will approximately 8.5 times.

Thus, after 10 seconds sulfur-30 would have decayed more because it has the least half-life.

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Answer:

D

Explanation:

Answer: option D

Explanation:

Since nonane is a saturated hydrocarbon called an Alkane.

Since it has 9 carbons in its carbon chain hence used Nona as root word

And -ane as suffix since functional group is alkane, single bond.

Hence , Nona+ and= nonane

So D is correct answer

Answer:

3.5 mL/hr.

Explanation:

So, the rate of  the pump in ml per hour will be = (7 mg)/(2 mg/mL)(1 hr) = 3.5 mL/hr.

Final answer:

To provide a patient with 7 mg of medication per hour from a solution of 1000 mg in 500 ml, the flow rate of the pump needs to be set at 3.5 ml per hour.

Explanation:

To calculate the flow rate of the pump in ml per hour for a medication order of 7 mg per hour, when the IV solution provided is 1000 mg in 500 ml, we use the proportion method. This involves setting up a proportion between the strength of the solution and the required dose to find the volume of solution that corresponds to the required dose.

First, we determine how many milligrams are in each milliliter of the solution: 1000 mg in 500 ml means there are 2 mg in each ml (1000 mg / 500 ml = 2 mg/ml). Then, knowing the patient needs 7 mg per hour, to find out how many milliliters that is, we divide the needed dose by the concentration: 7 mg / (2 mg/ml) = 3.5 ml per hour.

This calculation shows that to administer 7 mg of medicine per hour, the flow rate must be set to 3.5 ml per hour.

0.688 would be the correct answer!

Answer:

The volume of hydrochloric acid increases.

Explanation:

will increase the the concentration of the products side, so the reaction will be shifted to the left side (backward) to suppress the increase in the concentration of water vapors by addition.

So, The volume of hydrochloric acid increases, the rate of backward reaction increases, the rate of forward reaction decreases, and the volume of chlorine decreases.

So, the right choice is: The volume of hydrochloric acid increases.

Answer & Explanation:

Kindly find the attached presentation.

Answer: Start off by figuring out a solid like a ice cube or such then start writing how it changes and what it goes through so say when you apply thermal energy/ heat then it becomes water which is it's liquid state and then continue.

Explanation:

Answer:

The boiling point of a liquid is the temperature at which its vapor pressure is equal to the pressure of the gas above it.The normal boiling point of a liquid is the temperature at which its vapor pressure is equal to one atmosphere 760 degrees

Explanation:

The atmospheric pressure when a liquid is boiling at its normal boiling point equals 1 atmosphere (atm) or 101.3 kilopascals (kPa). This is the point where the vapor pressure of the liquid matches the external atmospheric pressure.

The atmospheric pressure when a liquid is boiling at its normal boiling point is known as 1 atmosphere (atm) or 101.3 kilopascals (kPa). The concept here revolves around the boiling point of a liquid, which is the temperature at which its equilibrium vapor pressure equals the external pressure exerted on the liquid by its gaseous surroundings. This is usually the Earth's atmospheric pressure in open containers.

Hence, when a liquid reaches its normal boiling point, the external atmospheric pressure equals 1 atm or 101.3 kPa. This means that at a liquid's normal boiling point, the vapor it produces has just enough energy to break free from the surface of the liquid without the help of further heating. For instance, the normal boiling point of water is 100 degrees Celsius, and this occurs at 1 atm of pressure.

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I think this is how to do it. but I'm sorry if it's not exactly right

Answer : The potential energy diagram is shown below.

Explanation :

Activation energy : The energy required to initiate the reaction is known as activation energy.

Or, it is the amount of energy required to reach the transition state.

Or, It is the minimum amount of energy that is absorbed by the reactant molecules so that their energy becomes equal to the threshold energy.

Or, the difference between the reactant and the transition state.

Enthalpy of a reaction : It is the energy change which takes place when the reactants go to the products. It is represented as, [tex]\Delta H[/tex]

Or, we can say that the difference between the product and the reactant.

If the heat is absorbed during the reaction then the enthalpy of reaction is positive and the reaction endothermic reaction.

If the heat is released during the reaction then the enthalpy of reaction is negative and the reaction exothermic reaction.

Answer:

answer is 2.04*10^4 kPa

Explanation:

Dalton's Law of Partial Pressures.

it is because that when the volume and the temperature of a gaseous mixture are kept constant, the total pressure of the mixture is equal to the sum of the partial pressures of its gaseous components .

Final answer:

Using Dalton's Law of Partial Pressures, the total pressure of a tank containing nitrogen and oxygen gases, given their partial pressures, is calculated as 2.04 × 10⁴ kPa.

Explanation:

The question asks for the total pressure of a tank containing a mixture of nitrogen and oxygen gases, given the partial pressures of both gases. According to Dalton's Law of Partial Pressures, the total pressure of a gas mixture is equal to the sum of the partial pressures of each gas in the mixture. This can be represented by the formula Ptotal = PN2 + PO2, where PN2 is the partial pressure of nitrogen, and PO2 is the partial pressure of oxygen.

In this case, the partial pressure of nitrogen (PN2) is given as 1.61 × 104 kPa, and the partial pressure of oxygen (PO2) is 4.34 × 103 kPa. Therefore, the total pressure (Ptotal) can be calculated as:

Ptotal = 1.61 × 104 kPa + 4.34 × 103 kPa
= 2.04 × 104 kPa

Thus, the total pressure of the tank is 2.04 × 104 kPa.

Answer: general representation of a secondary amine is [tex]R_2NH[/tex] .

Explanation: Ammonia is [tex]NH_3[/tex] . When one or more H atoms of ammonia molecule are replaced by alkyl groups then the newly formed compounds are known as amines.

If one of the H atom from ammonia molecule is replaced by an alkyl group then we call it primary amine. It's written as [tex]RNH_2[/tex] .

If two H atoms of ammonia molecule are replaced by same or different alkyl groups then we call it secondary amine. It's written as [tex]R_2NH[/tex]  and if all the three H atoms of ammonia molecule are replaced by same or different alkyl groups then we call it tertiary amine. It is written as [tex]R_3N[/tex] .

So, the general representation of a secondary amine is [tex]R_2NH[/tex] .

A general representation of a secondary amine is R₁-N(R₂)-R₃

Organic substituents R₁ R₂ , and R₃ are hydrogen atoms that are joined to the nitrogen atom (N).

Two organic substituents (R₁ and R₂), as well as one hydrogen atom (R₃), are attached to the central nitrogen (N).

A nitrogen atom is joined to two carbon atoms and one hydrogen atom to form the secondary amine family of chemical molecules. They are referred to as "secondary" amines because the nitrogen has two organic substituents (R₁ and R₂) bonded to them. While there is three organic substituents connected to the nitrogen in tertiary amines, there is only one organic substituent attached to the nitrogen in primary amines.

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Answer:

[tex]\boxed{\text{922 mL}}[/tex]

Explanation:

The pressure is constant, so we can use Charles' Law to calculate the volume.

[tex]\dfrac{V_{1}}{T_{1}} = \dfrac{V_{2}}{T_{2}}[/tex]

Data:

V₁ = 693 mL; T₁ =  45 °C

V₂ = ?;           T₂ = 150 °C

Calculations:

(a) Convert temperature to kelvins

T₁ = (  45 + 273.15) = 318.15 K

T₂ = (150 + 273.15) = 423.15 K

(b) Calculate the volume

[tex]\dfrac{ 693}{318.15} = \dfrac{ V_{2}}{423.15}\\\\2.178 = \dfrac{ V_{2}}{423.15}\\\\V_{2} = 2.178 \times 423.15 = \boxed{\textbf{922 mL}}[/tex]

Using Charles's Law, convert the given temperatures to Kelvin, then solve for final volume V2 using the formula V2 = (V1 × T2) / T1. Perform the calculations to determine the volume of gas at 150°C.

To calculate the volume of gas at 150°C when it had a volume of 693 mL at 45°C, we can use Charles's Law which relates volumes and temperatures of an ideal gas, maintaining pressure and the amount of gas constant.

Mathematically, the law is expressed as: V1/T1 = V2/T2. First, we need to convert the temperatures from Celsius to Kelvin by adding 273.15. So, T1 = 45°C + 273.15 = 318.15 K and T2 = 150°C + 273.15 = 423.15 K. We have the initial volume V1 = 693 mL and want to find V2.

Using Charles's Law, we rearrange the formula to solve for V2: V2 = (V1 × T2) / T1. Plugging in the values, we get V2 = (693 mL × 423.15 K) / 318.15 K. Execute the multiplication and division to get the final volume V2.

It is endothermic the cake is taking in heat and baking in order to rise

Answer:

355.5 g.

Explanation:

2Al + 6HCl → 2AlCl₃ + 3H₂,

It is clear that 2.0 moles of Al react with 6.0 mole of HCl to produce 2.0 moles of AlCl₃ and 3.0 mole of H₂.

no. of moles of Al = mass/atomic mass = (87.7 g)/(26.98 g/mol) = 3.251 mol.

Using cross multiplication:

2.0 mol of Al need to react → 6.0 mol of HCl, from stichiometry.

3.251 mol of Al need to react → ??? mol of HCl.

∴ the no. of moles of HCl needed to react with (87.7 g) 3.251 mol of Al = (3.251 mol)(6.0 mol)/(2.0 mol) = 9.752 mol.

mass of HCl = (no. of moles)(molar mass) = (9.752 mol)(36.46 g/mol) = 355.5 g.

Answer:

= 9,593.1 Joules

Explanation:

Heat absorbed by water is equivalent to heat released by copper.

Heat absorbed is given by;

Q = mcΔT

where m is the mass, c is the specific capacity and ΔT is the change in temperature.

Therefore;

Since dnsity of water is 1 g/mL, and specific heat capacity is 4.18 J/g°C while the change in temperature is (75-24) = 51°C.

Heat absorbed by water = 45 g × 4.18 J/g°C × 51

                                         = 9,593.1 Joules

Therefore, the heat released by copper is 9,593.1 Joules

Answer:

The right choice is  K(eq) = ([CO₂]) / [O₂]

Explanation:

The equilibrium constant of a chemical reaction is the value of its reaction quotient at chemical equilibrium

For a system undergoing a reversible reaction described by the general chemical equation

An equilibrium constant can be expressed as following

K(eq) = ([X]ˣ*[N]ⁿ) / ([A]ᵃ*[B]ᵇ)

where [] is the equilibrium concentration of each component.

and the concentration of solid is conventionally considered as 1

in your example:

The reversible reaction

taking in consideration that C is a solid and the concentration of solid is conventionally considered as 1

So,  the equilibrium constant for this reversible reaction can be expressed as following

∴ The right choice is  K(eq) = ([CO₂]) / [O₂]

Final answer:

A reversible reaction involves reactants and products that can interconvert, and equilibrium is the state when their rates of formation are equal. The reaction quotient (Q) is used to assess the reaction's status.

Explanation:

A reversible reaction is a chemical process where the reactants form products, which can in turn react together to form the original reactants. This kind of reaction is denoted by a double-headed arrow. When a reversible reaction reaches a state where the rate of the forward reaction equals the rate of the reverse reaction, it is said to be at equilibrium. To evaluate the status of a reversible reaction, the reaction quotient (Q) is used, which compares the concentrations of the products and reactants at any given point in the reaction.

Reversible reactions are significant in many areas, including biochemical processes in the human body. Although some reactions may appear to proceed in one direction due to energetics or other factors, under the right conditions, reversibility is possible. The concept of equilibrium and the conditions affecting reversible reactions are fundamental to understanding chemical systems.

Answer:

Explanation:

Okay I just took this test and I will just tell you now

D is not the answer.

Sorry I couldn't be more help

Answer:

B

Explanation:

There is less air pressure outside the door than inside the door.

Cellular respiration is the process of taking in glucose (sugar) and converting it into usable energy (ATP) so therefore the first stage would be taking the glucose into your bloodstream.

Answer:

The stage ha opens I in cytoplasm, glucose is broken down, and energy is released

Explanation:

I think

The answer is:

We have that there were produced 0.120 moles of [tex]CO_{2}[/tex]

[tex]n=0.120mol[/tex]

We are asked to calculate the number of moles of the given gas, also, we  are given the volume, the temperature and the pressure of the gas, we can calculate the approximate volume using The Ideal Gas Law.

The Ideal Gas Law is based on Boyle's Law, Gay-Lussac's Law, Charles's Law, and Avogadro's Law, and it's described by the following equation:

[tex]PV=nRT[/tex]

Where,

P is the pressure of the gas.

V is the volume of the gas.

n is the number of moles of the gas.

T is the absolute temperature of the gas (Kelvin).

R is the ideal gas constant (to work with pressure in mmHg), which is equal to:

[tex]R=62.363\frac{mmHg.L}{mol.K}[/tex]

We must remember that the The Ideal Gas Law equation works with absolute temperatures (K), so, if we are given relative temperatures such as Celsius degrees or Fahrenheit degrees, we need to convert it to Kelvin before we proceed to work with the equation.

We can convert from Celsius degrees to Kelvin using the following formula:

[tex]Temperature(K)=Temperature(C\°) + 273K[/tex]

So, we are given the following information:

[tex]Pressure=760mmHg\\Volume=2.965L\\Temperature=25.5C\°=25.5+273K=298.5K[/tex]

Now, isolating the number of moles, and substituting the given information, we have:

[tex]PV=nRT[/tex]

[tex]n=\frac{PV}{RT}[/tex]

[tex]n=\frac{PV}{RT}[/tex]

[tex]n=\frac{760mmHg*2.965L}{62.363\frac{mmHg.L}{mol.K}*298.5K}[/tex]

[tex]n=\frac{760mmHg*2.965L}{62.363\frac{mmHg.L}{mol.K}*298.5K}\\\\n=\frac{2242mmHg.L}{18615.355\frac{mmHg.L}{mol.}}\\\\n=0.120mole[/tex]

Hence, we have that there were produced 0.120 moles of [tex]CO_{2}[/tex]

[tex]n=0.120mol[/tex]

Have a nice day!

Answer:

4.09

Explanation:

Answer:

4.09

Explanation:

Answer:

On the periodic table, electronegativity generally

1. decreases as you move down a group and

2. increases as you move from left to right across a period.

Therefore, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.

Electronegativity on the periodic table increases from left to right across a period and decreases from top to bottom within a group, with fluorine being the most electronegative element.

The trend in electronegativity on the periodic table describes how the ability of an atom to attract bonding electrons changes across the table. Generally, electronegativity decreases from top to bottom within a column as a result of increasing atomic size, which makes the nucleus less effective at pulling in bonding electrons. Conversely, electronegativity increases from left to right across a row due to a decrease in atomic size, making the nucleus more effective in attracting bonding electrons. Elements in the halogen group have some of the highest electronegativities because they need only one more valence electron to complete their outer shell, unlike group 1 elements which are more willing to give up their valence electron. Fluorine is the most electronegative element, and cesium is the least electronegative nonradioactive element, excluding the noble gases and hydrogen which have special cases in terms of electronegativity.

Answer:

2. ∆ T =  10.8 ˚C

3. q =  45,187.2 J

4. q =  7506 J

5. q (rxn) = - 52,693.2 J

6. This calculation shows that burning 1.11  grams of methane [takes  in/gives off] gives off energy.

7.  The number of moles  of methane burned in the experiment = 0.069 mol.

8. Experimental molar heat of combustion = - 761,462.4 J/mol = - 761.5 kJ/mol

9. This may be attributed to experimental error occurring like thermometers misreading , heat loses to surrounding (as the efficiency of any calorimeter doesn't reach 100 % ), and poor lab technique.

10. % Error = 14.4 %

============================================

Explanation:

Firstly, from the given information  

for water:

Initial temperature = T₁ = 24.85 °C

Final temperature = T₂ = 35.65 °C

So, the the change in temperature can be calculated

ΔT = Final temperature - Initial temperature

For calorimeter:

The heat capacity of the calorimeter is 695 J/ °C

============================================

2. ΔT = T₂ - T₁  = 35.65 °C - 24.85 °C = 10.80 °C

============================================

3. The heat absorbed by the water can be calculated from

q(water) = m • c • ΔT

where,

m =mass of water = 1000 g

C = The specific heat capacity of water = 4.184 J/g °C

So,

q(water) = m • c • ΔT = 1000 g * 4.184 J/g °C * 10.80 °C

q(water) = 45,187.2 J

============================================

4. To calculate the heat absorbed by the calorimeter,

one can use the formula

Where,

C = The heat capacity of Calorimeter = 695 J/ °C

So, Using the above formula

============================================

5. The total heat of combustion reaction can be calculated  using the formula

∵ Amount of heat released by the reaction = - [Amount of heat absorbed by Calorimeter + Amount of heat absorbed by Water]

 q (rxn) = -[q(cal) + q(water)

]

∴ q (rxn) = -[7,506 J + 45,187.2 J

]  = - 52,693.2 J

That means that this is an exothermic reaction.

============================================

6. By evaluating the above information one can complete the following sentence:

This calculation shows that burning 1.11  grams of methane [takes  in/gives off] gives off energy.

============================================

7. To calculate the number of moles  of methane burned in the experiment

No. of moles = (mass / molar mass) = (1.11 g / 16.04 g/mol) =  0.069 mol

============================================

8. The experimental molar heat of combustion can be calculated from the following:

∴ Experimental molar heat of combustion = (q (rxn) / no. ofmoles of methane)

  Experimental molar heat of combustion = (-52,693.2 J / 0.069 mol)

                                                                         = - 761,462.4 J/mol

                                                                         = - 761.5 kJ/mol.

============================================

9. The accepted value for the heat of combustion of methane is -890 KJ/mol.  Explain why the experimental data might differ from the theoretical value.

This may be attributed to experimental error occurring like thermometers misreading , heat loses to surrounding (as the efficiency of any calorimeter doesn't reach 100 %),and poor lab technique.

============================================

10. Calculate the percent error for the experiment.

Given the formula below:  

% Error = [Theoretical value - Experimental value) /Theoretical value] ×100

one can Calculate the percent error for the experiment

where

Theoretical value = - 890 KJ/mol.

Theoretical value = - 761.5 KJ/mol.

% Error = [Theoretical value - Experimental value) /Theoretical value] ×100

% Error = [(-890) - (-761.5) /(-890)] ×100

= 14.4 %

============================================

Answer: exothermic

Explanation: It is a combustion reaction with methane.

The given chemical equation is representing the exothermic type of reaction. Therefore, option (C) is correct.

An exothermic process can be demonstrated as a thermodynamic reaction that emits energy from the system to its surroundings, generally in the form of heat, light, or sound.

While an endothermic process is defined as an opposite of an exothermic process where the heat gets energy in the form of heat. The chemical bond energy in chemical reactions is transformed into thermal energy.

In exothermic reactions, the change in the kinetic energy of molecules when the heat is liberated. The electronic transition from one energy level to another causes light to be released.

The combustion reaction is the exothermic reaction therefore, the combustion of methane liberates heat along with carbon dioxide and water. When methane reacts with oxygen gas, it produces energy along with the other products of the combustion reaction.

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Answer: the answer is a fixed shape

Explanation:

Hope this helps

In the gas phase, a sample of molecules will have low density.

According to the question;

The gas phase of matter has some peculiar characteristics which include;

As a consequence of the properties above; Although the mass of the molecules is constant, their volume increases drastically consequently rendering the density lower.

a

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