A student conducting a calorimetry investigation determines a negative ∆H. What does the negative value indicate about the reaction?

Answer:

106,080 newtons per meter squared

Explanation:

First you take the density of mecury multiply by the height in meters then multiply by the gravity: 13600×0.02×10= 2720

Then add the answer to the standard atmospheric presssure:

2720+ 103,360= 106,080

The study of chemicals and bonds is called chemistry.

The correct answer is 106,080N/s

First, we have to multiply the mercury by the height to find the density. The density is as follows:-

[tex]13600*0.02*10= 2720[/tex]

We have to convert the density into standard atmospheric pressure:

[tex]2720+ 103,360= 106,080[/tex]

Hence, the correct answer is 106080N/s

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Answer:

As the pH value is less than 7, (in this case 5,94) it corresponds to an acidic substance.

Explanation:

The pH indicates the acidity or basicity of a substance. pH values between 0 and less than 7 indicate acidic solutions, 7 neutral and higher than 7 to 14 basic. It is calculated as: pH = -log (H 30+)

First we calculate the concentration of H 30+:

Both pH and pOH have a relationship to belonging to the same aqueous solution: the expression of the Kwater (ionic product of the water Kw) is used:

(H3O  +) x (OH  -) = 1x10 ^ -14

(H3O  +) x (8.8 x 10^-9)= 1x10 ^ -14

(H30+)= 1x10 ^ -14/(8.8 x 10^-9)

(H30+)= 1,14 x 10^-6 M

pH= -log (H30+)

pH= -log (1,14 x 10^-6)

pH=5,94  As the pH value is less than 7, it corresponds to an acidic substance.

54.03 moles of gas were left the next morning, assuming the temperature and volume of the tank stayed constant.

Explanation:

Status of the oxygen gas at night or initial conditions.

volume of the tank = 70 litre

temperature = 27 degree celsius or 300.15 K

pressure = ?

number of moles of oxygen = 119

R = 0.0821 L atm/mole K

applying gas law

PV = nRT

P = [tex]\frac{0.0821 X 119.4 X 300.15}{70}[/tex]

P  = 42 atm

in the morning

volume  = 70 litres

temperature = 300.15 K

Pressure = 19 atm

n = ?

R =  0.0821 L atm/mole K

Applying  Ideal Gas law,

PV= nRT

putting the values in the formula:

n = [tex]\frac{19 X 70}{0.0821 X 300.15}[/tex]

 n  = 54.03 moles will be left in the morning.

Final answer:

The pH of Sprite with a [H+] concentration of .000045 M is approximately 4.35, which is calculated using the formula pH = -log([H+]).

Explanation:

To calculate the pH of Sprite, which has a hydrogen ion concentration [H+] = .000045 M, we use the formula pH = -log([H+]). By inserting the given concentration into this formula, we find that pH = -log(.000045). Using a calculator to perform this logarithm results in a pH of approximately 4.35.

This calculation demonstrates the acidic nature of Sprite, as a pH lower than 7 indicates an acidic solution. The understanding of pH is crucial in chemistry to determine the acidity or basicity of a solution.

Answer&Explanation:

According to dilution law concentration before dilution is equal to concentration after dilution hence;;

Volume×molarity(before)=volume×molarty(after)

345ml×1.5M=?M×250ml

Cross multiplication

Molarity will be equal to 2.07M

Answer:

its not 2H+ + 2OH- -> H20

Explanation

answer is A on ed2020

The net ionic equation for the reaction between Ca(OH)2 and H2SO4 is; 2OH^-(aq) + 2H^+(aq) ----->2H2O(l).

The net ionic equations shows the ions that underwent a change in te cause of the reaction. Hence, the net ionic equation would always exclude the spectator ions.

In this case, the net ionic equation is; 2OH^-(aq) + 2H^+(aq) ----->2H2O(l). The calcium and the sulfate ions are spectator ions.

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Answer:

Sound energy is a form of energy that can be heard by humans.

Ex- buzzing bee, balloon popping

Explanation:

Answer:

Q = 1569 j

Explanation:

Given data:

Mass of water = 5.00 g

Initial temperature = 25.0°C

Final temperature = 100°C

Cp = 4.184 j/g.°C

Energy needed = ?

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT =  100°C - 25°C

ΔT =  75°C

Q = 5 g× 4.184 j/g.°C×75°C

Q = 1569 j

Answer:

monoxide

dioxide

trioxide

tetroxide

pentoxide

hexoxide

heptoxide

octoxide

nonoxide

Explanation:

Just the way it is. If there is an -a or -o infront of the oxide(or another substance that starts with vowel), the a is often dropped.

Hey there!

Your answer is B. Intramolecular; intermolecular.

Intramolecular forces are the forces that keep the atoms together in the molecule.

Intermolecular forces are the forces that are different molecules interacting with each other.

You can remember this by thinking about the prefixes inter- and intra-. Inter- refers to open systems within groups. The groups are the different molecules which are interacting with each other.

Intra-, however, refers to the closed system inside of a single group. The single group is the one molecule, and the interactions are happening between the atoms within the molecule.

Hope this helps!

Answer:

1.8 × 10⁻¹⁶ mol  

Explanation:

(a) Calculate the solubility of the Sr₃(PO₄)₂

Let s = the solubility of Sr₃(PO₄)₂.

The equation for the equilibrium is

Sr₃(PO₄)₂(s) ⇌ 3Sr²⁺(aq) + 2PO₄³⁻(aq); Ksp = 1.0 × 10⁻³¹

                         1.2 + 3s          2s

[tex]K_{sp} =\text{[Sr$^{2+}$]$^{3}$[PO$_{4}^{3-}$]$^{2}$} = (1.2 + 3s)^{3}\times (2s)^{2} = 1.0 \times 10^{-31}\\\text{Assume } 3s \ll 1.2\\1.2^{3} \times 4s^{2} = 1.0 \times 10^{-31}\\6.91s^{2} = 1.0 \times 10^{-31}\\s^{2} = \dfrac{1.0 \times 10^{-31}}{6.91} = 1.45 \times 10^{-32}\\\\s = \sqrt{ 1.45 \times 10^{-32}} = 1.20 \times 10^{-16} \text{ mol/L}\\[/tex]

(b) Concentration of PO₄³⁻

[PO₄³⁻] = 2s = 2 × 1.20× 10⁻¹⁶ mol·L⁻¹ = 2.41× 10⁻¹⁶ mol·L⁻¹

(c) Moles of PO₄³⁻

Moles = 0.750 L × 2.41 × 10⁻¹⁶ mol·L⁻¹ = 1.8 × 10⁻¹⁶ mol

To calculate the amount of PO4^3- present at equilibrium, we can use the stoichiometry of the reaction and the amount of Sr3(PO4)2 added. Since the reaction has a 1:2 stoichiometry, the amount of PO4^3- is twice the amount of Sr3(PO4)2 added. The amount of Sr3(PO4)2 added can be calculated using the molarity and volume of the Sr(NO3)2 solution.

To calculate the amount of PO43- present at equilibrium, we need to use the concept of solubility product constant (Ksp) and the stoichiometry of the reaction.

First, let's write the balanced equation for the reaction:

Sr3(PO4)2(s) → 3Sr2+(aq) + 2PO43-(aq)

According to the stoichiometry of the reaction, 1 mole of Sr3(PO4)2 produces 2 moles of PO43-. Therefore, if we have excess Sr3(PO4)2, all Sr3(PO4)2 will dissolve and the amount of PO43- at equilibrium is equal to twice the amount of Sr3(PO4)2 added.

Since we have 750 mL of 1.2 M Sr(NO3)2, we can calculate the amount of Sr3(PO4)2 added:

750 mL * 1.2 mol/L = 900 mol Sr2+

Therefore, the amount of PO43- present at equilibrium is 2 * 900 mol = 1800 mol.

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Answer:

A. Sometimes the coefficient for the oxygen molecule is not a whole number

Explanation:

The correct answer is option  A. Sometimes the coefficient for the oxygen molecule is not a whole number.

Hydrocarbon combustion refers to the chemical reaction where a hydrocarbon reacts with oxygen to create carbon dioxide, water, and heat.

Balancing combustion reactions is easy. First, balance the carbon and hydrogen atoms on both sides of the equation. Then, balance the oxygen atoms.

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Answer:A substance's molar mass is calculated by multiplying its relative atomic mass by the molar mass constant (1 g/mol). The molar mass constant can be used to convert mass to moles. By multiplying a given mass by the molar mass, the amount of moles of the substance can be calculated.

Explanation:

Answer: molar mass

Explanation:

Mole = mass/molar mass

Mass = molar mass × mole

Answer:

I beleive this should help you find ur answer The molecular mass of Aluminum Oxide is approximately 102 grams per mole. 105.9 g Al were burned in excess O2 to produce 200.0 g Al2O3

Explanation:

Answer:

endothermic reaction.

Explanation:

An increase in the temperature of a system at equilibrium favors the backward or reversible reaction.

According to the equilibrium law, when any external stress is applied at the equilibrium state then the equilibrium will shift to that side which decreases the external affect.

Suppose a chemical reaction which is exothermic in nature will be represented as:

A + B ⇄ C + D

If we increases the temperature then reaction will shift to the left side to overcome the effect of increased temperature.

Hence reversible reaction proceeds on increasing the temperature.

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Answer:

The pressure will be 4, 5 atm

Explanation:

We use Boyle Mariotte's formula: for a given mass of gas at constant temperature, the pressure and volume vary inversely proportionally:

P1xV1=P2xV2

P2= (P1xV1)/V2 = (1,5 atm x 6 L)/2 L=4,5 atm

Answer:

Scientists don't actually measure astronomical distances in light years. Rather, they measure them in a unit called the Parsec , and only convert to light years when they're talking to the general public . One light-year is the distance light travels through space in one year.

Explanation:

Answer:

D  

Explanation:

5,778K

Answer:red

Explanation:

The stars can be classified in many ways, including by mass, color, and temperature. The color and the temperature of a star are usually related.

Antares is a red supergiant.

Answer:

1025.05

Explanation:

1calories=4.184 joulse

so if multiply 245 by 4.184

The calculation of energy from calories to joules is determined below:

One Joule may be defined as the amount of energy that is significantly required to be exerted when a force of one newton is put in an application over a displacement of one meter.

The calorie may be defined as the amount of heat needed at a pressure of 1 atm in order to enhance that temperature of 1 gram of any solution by 1°C.

According to the question,

The total amount of calories = 245.

As per the common calculation or conversion factors,

1 calorie ≅ 4.2 Joules.

∴ 245 calories = 245 × 4.2 = 1029 Joules.

Therefore, according to the calculation, the total amount of energy in 245 Calories is equal to 1029 joules.

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Answer:

91.62 C

Explanation:

Q  =  ( m ) ( Csh ) ( T2 - T1 )

T2  = T1  +  ( Q ) / ( m ) ( Csh )

T2  =  98.8 C  +  ( - 7500 J ) / ( 250 g ) ( 4.186 J/g - C )

T2  =  91.6 C

The final temperature of the water is approximately [tex]\(91.624 \, ^\circ \text{C}\).[/tex]

To calculate the final temperature of the water, we'll use the heat transfer equation:

Q = [tex]mc\Delta T[/tex]

Given values:

m = 250g (mass of water)

c = [tex]1 \, \text{cal/g}^\circ \text{C}\)[/tex] specific heat capacity of water)

Q = -1794 cal (negative because heat is lost)

Now, we'll rearrange the formula to solve for [tex]\(\Delta T\)[/tex] :

[tex]\[\Delta T = \frac{Q}{mc}\][/tex]

Substitute the values:

[tex]\[\Delta T = \frac{-1794 \, \text{cal}}{(250 \, \text{g})(1 \, \text{cal/g}^\circ \text{C})}\][/tex]

Now, calculate [tex]\(\Delta T\)[/tex]:

[tex]\[\Delta T \approx -7.176 \, ^\circ \text{C}\][/tex]

The negative sign indicates a decrease in temperature, which makes sense since heat was lost.

Now, find the final temperature [tex](\(T_{\text{final}}\))[/tex] :

[tex]\[T_{\text{final}} = T_{\text{initial}} + \Delta T\][/tex]

[tex]\[T_{\text{final}} = 98.8 \, ^\circ \text{C} - 7.176 \, ^\circ \text{C}\][/tex]

[tex]\[T_{\text{final}} \approx 91.624 \, ^\circ \text{C}\][/tex]

So, the final temperature of the water is approximately [tex]\(91.624 \, ^\circ \text{C}\)[/tex].

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Answer:

B

Explanation:

Population size is the number of individuals in a population.

Population density is the average number of individuals per unit of area or volume.

Answer:

A

Explanation:

they pull apart if u see the first one they go like this < > leaving a gap in the middle

In type A of plate boundary, a trench will most likely to form ocean trenches are caused by tectonic activity, which is the movement of the Earth's lithosphere, hence option A is correct.

Oceanic trenches are long, narrow, noticeable topographic depressions on the ocean bottom. They are normally 50 to 100 kilometers broad and 3 to 4 kilometers below the surrounding marine bottom, but can stretch for thousands of km.

Ocean trenches, in particular, are a hallmark of convergent plate boundaries, when two or more tectonic plates collide.

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Answer:

The Oxygen Atom

Explanation:

The oxygen atom in a water molecule has the greatest electronegativity. Therefore, the correct option is option C.

The tendency of an atom of a particular chemical element could attract shared electrons while forming a chemical bond is represented by the symbol. The electronegativity of an atom is determined both by its atomic number as well as the distance between its valence electrons and the charged nucleus.

The higher the related electronegativity, the more electrons an atom or substituent group attracts. Electronegativity is a simple approach to quantify bond energy as well as the sign and degree of a bond's molecular polarity, that describes a bond all along continuum between covalent through ionic bonding. The oxygen atom in a water molecule has the greatest electronegativity.

Therefore, the correct option is option C.

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Answer: The Molarity of the sulphate ion in a 2M  [tex]K_2SO_4[/tex] solution is 2M

Explanation:

Molarity is defined as the number of moles of solute dissolved per liter of the solution.

[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]

where,

n= moles of solute

[tex]V_s[/tex] = volume of solution in ml

[tex]K_2SO_4\rightarrow 2K^{+}+SO_4^{2-}[/tex]

Now as 1 mole of [tex]K_2SO_4[/tex] gives = 1 mole of [tex]SO_4^{2-}[/tex]

2 moles of [tex]K_2SO_4[/tex] gives =[tex]\frac{1}{1}\times 2=2[/tex] moles of [tex]SO_4^{2-}[/tex]

Thus Molarity of the sulphate ion in a 2M [tex]K_2SO_4[/tex] solution is 2 M

c) are often metals

liquids are fairly good thermal conductors while gases and things like wood and plastic foam are poor conductors of heat.

Thermal conductors have high thermal conductivity and are usually metals because they have free electrons that are efficient at transferring heat. Latent heat is not a direct measure of thermal conductivity. Thus, it can be stated that thermal conductors have high conductivity (option A).

Thermal conductors are materials that have a high ability to transfer heat through them. Among the multiple-choice options provided, the correct answers that accurately define thermal conductors are:

A. have high conductivity - Thermal conductors have high thermal conductivity, meaning they can efficiently transfer heat.

C. are often metals - Most metals, such as copper and aluminum, are good examples of thermal conductors due to the presence of free electrons which facilitate the transfer of heat.

In the context of the options provided related to latent heat, the most appropriate option is A (have high conductivity) which is a characteristic of a thermal conductor. Latent heat primarily concerns the heat absorbed or released during phase changes, not thermal conductivity.

When we speak about materials' thermal properties, we often refer to conductors and insulators. Good electrical conductors, which are typically metals, are also known to be good heat conductors due to the free movement of electrons that transport thermal energy.

Answer: malaria

Explanation:

Answer:

malaria

Explanation:

Answer and Explanation:

Let's just make it easy and have both parents be heterozygous. This means that they each have 1 dominant allele (R) and 1 recessive allele (r). Make a Punnett Square (see attachment).

The possible outcomes are RR (one of it), Rr (two of it), and rr (one of it). That means that phenotypically, 3 of the offspring will be round and 1 will be wrinkled.

Answer:

Rr,    RR,    rr

Explanation:

Answer:

1.61 × 10⁶ kJ

Explanation:

The human burns energy so as to be healthy.

The amount of energy burnt per day by an adult human is 2 × 20³ kcal per day. Since there is 24 hours in a day, the amount of energy burnt per hour is 2 × 20³ × 24 = 48 × 20³ kcal per hour.

The conversion rate of kcal to kJ is 1 kcal = 4.184 kJ. Therefore converting the kcal per hour to kJ per hour gives:

48 × 20³ × 4.184 = 200.882 × 20³ kJ = 1.61 × 10⁶ kJ

Final answer:

Rate in kJ per hour = 34.93 kJ/hTo convert the rate from kcal per day to kJ per hour, you can multiply the average daily energy burn by the conversion factor of 4.184 kJ/kcal and 1 day/24 hours.

Explanation:

To convert kcal to kJ, we can multiply by a conversion factor of 4.184.

Therefore, to find the rate in kJ per hour, we can multiply the average daily energy burn by the conversion factor for both kcal to kJ and hours to days.

The calculation would be:

Rate in kJ per hour = (2.00x10³ kcal/day) x (4.184 kJ/kcal) x (1 day/24 hours)

The rate in kJ per hour = 34.93 kJ/h