Calculate the pH for each of the following cases in the titration of 25.0 mL of 0.150 M pyridine, C5H5N(aq) with 0.150 M HBr(aq):
(a) before addition of any HBr
(b) after addition of 12.5 mL of HBr
(c) after addition of 19.0 mL of HBr
(d) after addition of 25.0 mL of HBr
(e) after addition of 33.0 mL of HBr

The final concentration of the reactant of a first order reaction can be determined from the rate constant equation. The concentration of ammonium carbonate after 39 s will be 0.003 M.

Rate constant of a reaction is the rate of reaction when one molar concentration of the reactant is involved in the reaction. The expression for the rate constant k for first order reaction is :

k = 1/t ln (C0/Ct)

Where C0 be the initial concentration and Ct be the concentration after t seconds.

Given that C0 of ammonium nitrate = 0.957 M

rate constant = 0.196 /s

t = 39 s.

The concentration after 39 seconds is calculated as follows:

0.196 /s = 1/39s ln (0.957 M / Ct)

Ct = 0.957 / (ln⁻¹ (0.196 × 39))

    = 0.003 M.

Therefore, the concentration of ammonium carbonate after 39 seconds will be 0.003 M.

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A volcano is caused by a rupture in the crust from which molten magma

escapes

The correct options are;

Reasons:

1. Due to the equal densities and buoyancy of the plates, there is no

subduction and the plates rise to form mountain ranges and no volcanoes.

2. The subduction causes the plates to form magma and then volcanoes.

3. Shallow earthquakes that have their epicenter at the fault line in the

ocean generate a tsunami.

4. The mantle lay under each plate and therefore, the high temperatures

of the mantle does not support the fact.

5. Volcanic arcs are formed in the convergence of two oceanic or oceanic

and continental plates.

6. When two continental plates converge, shallow earthquakes occur.

7. A crack called a trench is formed by the interaction of an oceanic crust

and another crust.

8. A subduction occurs when oceanic plates converge.

9. A fault is produced by horizontal plate movement.

10. A Flip or kick upwards of water is known as a tsunami.

11. Subduction occurs during convergence of two plates such that a

subducted plate goes down beneath an overriding plate.

12. The illustration of seafloor spreading consists of two plates moving

away from each other.

Question 12: Based on Department of Education Science Module.

13. Earthquake occur at places where the plates are moving (including

subducting).

14. Volcanic island arcs are formed by two oceanic plates.

15. At the location where the continents meet the seas, oceanic plates are

subducted under the continental plate, melted to magma in the mantle

from which volcano is formed.

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Answer:

answer in picture

Explanation:

The balanced chemical equation will be Ca + MgCl2 → CaCl2 + Mg.

An equation that has the same quantity of atoms on both sides of the arrow would be said to represent a balanced chemical reaction.

The given equation is Ca + MgCl2 →

It is known that when Ca is reacted with magnesium chloride ( MgCl2) then it will form calcium chloride (CaCl2 ) and magnesium.

Ca + MgCl2 → CaCl2 + Mg.

It can be seen that, calcium has one atom in the reactant side and one atom in product side. On the other hand, chlorine has one atom in reactant side as well as product side.

Hence, the reaction will be balanced.

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Answer:

I think it's B

Explanation:

The energy in joules of a photon that has a frequency of 7.49 × 10¹⁴ s⁻¹ is 4.963 × 10-²¹ J.

The energy of a photon or light wave can be calculated using the following formula:

E = hf

Where;

According to this question, the frequency a photon is given as 7.49 × 10¹⁴ s⁻¹ where the Planck's constant (h) is 6.626 × 10⁻³⁴ J • s. The energy can be calculated as follows:

E = 7.49 × 10¹⁴ × 6.626 × 10⁻³⁴

E = 4.963 × 10-²¹ J

Therefore, the energy in joules of a photon that has a frequency of 7.49 × 10¹⁴ s⁻¹ is 4.963 × 10-²¹ J.

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Answer:

molecules will speed up

Explanation:

Cuso4 + NaoH -》cu(oH)2 +Na2So4

Cuso4 + 2NaoH -》cu(oH)2 +Na2So4

Explanation:

this is balanced equation

Answer:

Conduction:

Ice pack

Burning yourself

Grabbing warm coffee

Handle of the pot

Convection:

Warm air rising

An oven that cooks by cycling warm air

Warm water rising to the surface

Radiation:

Heat from the fire

Heat from the sun

Cooking popcorn using the microwave

-300;800 is the correct answer

Answer:

The groupings of elements in the periodic table reveal various trends, present in groups such as the alkali metals and noble gases, or the lanthanides and actinides. The periodic table can be used to find information on elements or predict the properties of as-of-yet undiscovered elements.

Explanation:

Answer: D

Just took the quiz

Explanation:

the most important observations is the conversion of electrical energy into light energy which performs the function of a lamp

in addition to this there is considerable amount of energy loss in form of heat energy when the electrical lamp is there is production of a result of this is not converted into light energy

It's called a joule or joules. Therefore the J in 196J joules.

The dog went to its water bowl for a drink. The correct option is A

A signal or stimulus that comes from within an organism's body and affects its behavior or physiological functions is referred to as an internal cue. The majority of the time internal cues are connected to an organism's internal condition such as its physiological requirements, feelings, or biological cycles.

A stimulation that an animal receives internally, such as thirst, hunger, or exhaustion, is known as an internal cue. In this instance, the dog is attempting to quench its hunger by heading to its water bowl.

Therefore, the correct option is A

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The statement "It has the same concentration of hydronium and hydroxide ions"  is true about a neutral solution.

If you've ever wondered what constitutes a neutral solution - it's one with an ideal pH balance set at precisely 7. Referred to as a 'neutral' because it doesn't lean towards acidity or alkalinity due to an equal concentration rate between hydronium ions (H+) and hydroxide ions (OH-).

Noteworthy examples can include distilled water, pure water, blood seawater, milk of magnesia among others.

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Answer:

true

Explanation:

When cyclic ester is reacted with ethyl alcohol in presence of heat and acidic medium, ethyl hexanoate is formed. The structure of ethyl hexanoate is attached in image.

Lactones are the name for cyclic esters. The COOH and OH groups that unite to generate water in these instances are a component of the same molecule.

German chemist Leopold Gmelin likely abbreviated the word "ester" from the German Essigäther, "acetic ether," when he first used it in 1848.

First, carbonyl oxygen abstracts a proton. The production of an ester on one side of the chain and alcohol on the other follow the attack of the ethyl molecule on the carbonyl carbon.

Thus, ethyl hexanoate is formed as a product.

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The half-life of a first-order reaction is given by the following equation:

t(1/2) = ln(2)/k

where t(1/2) is the half-life and k is the rate constant.

From the given information, we know that the partial pressure of FC1O2(g) falls from 0.080 atm to 0.010 atm over 48 minutes. We can use this information to calculate the rate constant as follows:

ln([FC1O2]t/[FC1O2]0) = -kt

where [FC1O2]t is the concentration (in atm) at time t, [FC1O2]0 is the initial concentration (in atm), and k is the rate constant.

Substituting the given values, we get:

ln(0.010/0.080) = -k(48)

Solving for k, we get:

k = 0.1225 min^-1

Now, we can use the equation for the half-life to calculate the answer:

t(1/2) = ln(2)/k

t(1/2) = ln(2)/0.1225

t(1/2) = 5.66 min (rounded to two significant figures)

Therefore, the half-life of the decomposition reaction is 5.66 minutes.

Answer:

0.0970 moles NaCl

Explanation:

To find the amount of moles, you need to multiply the mass (grams) by the molar mass of NaCl. The molar mass exists as a ratio that compares the mass of a substance per every 1 mole. The molar mass is made up of the individual atomic masses of every element in the molecule. The final answer should have 3 sig figs like the given value (5.67 = 3 sig figs).

Atomic Mass (Na): 22.770 g/mol

Atomic Mass (Cl): 35.453 g/mol

Molar Mass (NaCl): 22.990 g/mol + 35.453 g/mol

Molar Mass (NaCl): 58.443 g/mol

 5.67 grams NaCl                 1 mole
----------------------------  x  -------------------------  =  0.0970 moles NaCl
                                        58.443 grams

A volcano can be defined as an opening on the surface of a planet that allows material warmer than surroundings to escape from its interior. Therefore, option (B) is correct.

A volcano can be described as an opening in the earth's crust through which lava, volcanic ash, and gases escape from its interior. When this material escapes, then eruptions can be calmer, with gentle flows of material, or can be explosive, sending material high into the sky.

When pieces of Earth's crust slowly move away from each other, magma can rise. The magma rises to fill in space and underwater volcanoes can form.

The tectonic plates can also move toward each other when magma rises. The part of Earth's crust can be forced deep into its interior which can cause the crust to melt and rise as magma.

The magma can also rise over hot spots. Hot spots can be defined as the hot areas inside of Earth where magma heats up and becomes less dense. With each way of rising the magma can form volcanoes.

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Answer:

Molarity of sucrose = 0.116 M (Approx.)

Explanation:

Given:

Volume of solution = 0.5 liter

Mass of sucrose in gram = 20 gram

Molar mass of sucrose 342.3 g/mol

Find:

Molarity of sucrose

Computation:

Mole of sucrose = Mass of sucrose in gram / Molar mass of sucrose

Mole of sucrose = 20 / 342.3

Mole of sucrose = 0.058 (Approx.)

Molarity of sucrose = Mole of sucrose / Volume of solution

Molarity of sucrose = 0.058 / 0.5

Molarity of sucrose = 0.116 M (Approx.)

Answer:

0.13 km/min west

Explanation:

I just did the test.

The volume of 12 gas forms when 21 L Cl2 react at STP is 21 L.

To determine the volume of 12 gas (I assume you mean I2 gas) formed when 21 L of Cl2 reacts at STP (standard temperature and pressure), we need to use the ideal gas law equation.

The ideal gas law equation is given by:

PV = nRT

Where:

P = pressure

V = volume

n = number of moles

R = ideal gas constant

T = temperature

At STP, the pressure is 1 atm, and the temperature is 273.15 K.

From the balanced equation, we can see that the molar ratio between Cl2 and I2 is 1:1. So, if 21 L of Cl2 reacts, it will produce an equal volume of I2 gas.

Given that the volume of Cl2 is 21 L, we can assume the volume of I2 gas formed will also be 21 L.

Therefore, the volume of I2 gas formed is 21 L.

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Answer:

When a copper is drawn into wire the only change that occurs is change in its shape and size no change will take place into its composition that is the wires are still possessing the properties of copper metal. Thus, a physical change takes place when copper is drawn into wire.

Explanation:

Sulfur Reduction Balancing

QUESTION

You are given the equation S + NaOH Na₂S₂O3 + Na₂S +H₂O

i. Explain with electronic concept which substance is oxidised and which is reduced?

ii.Balance the equation by Ion electron or oxidation number method.

iii. Indicate the number of NaOH molecules used.

ANSWER

i. In this reaction, the sodium thiosulfate (Na₂S₂O₃) is being formed from the reaction between sodium hydroxide (NaOH) and sulfur (S). Since sodium thiosulfate has a lower oxidation state of sulfur than elemental sulfur, it can be inferred that sulfur has been reduced, meaning it has gained electrons. On the other hand, sodium hydroxide has not undergone any change in oxidation state, so it can be concluded that it is not oxidized or reduced in this reaction.

ii. To balance the equation using the oxidation number method, we first need to assign oxidation states to each element.

S + NaOH → Na₂S₂O₃ + Na₂S + H₂O

S: 0 → -2

Na: +1 → +1

O: -2 → -2

H: +1 → +1

Now we can see that sulfur has been reduced from 0 to -2, and the oxygen in thiosulfate (S₂O₃²⁻) has been oxidized from -2 to -1. We can balance the equation by adding electrons to the left-hand side to balance the reduction of sulfur and removing electrons from the right-hand side to balance the oxidation of oxygen.

S + 2NaOH + 2e⁻ → Na₂S + 2e⁻ + H₂O

S + 2NaOH → Na₂S + H₂O

S + 2NaOH → Na₂S₂O₃ + Na₂S + H₂O

2S + 4NaOH → Na₂S₂O₃ + 2Na₂S + 2H₂O

Therefore, the balanced equation is: 2S + 4NaOH → Na₂S₂O₃ + 2Na₂S + 2H₂O

iii. The equation indicates that 4 molecules of NaOH are used in the reaction.

Answer: The answer is 9.8 m/s^2 south

Explanation:

Answer:

53.5gram.

Explanation

Explanation: number of moles = number of molecule ÷ avogadro's number. => moles = 6.022 × 10²³ ÷ 6.022 × 10²³ = 1 mole. mass of 1 mole of NH4Cl = 1 × molar mass.

Answer:

More energy is released from the old substance than the new substance needs to form its chemical bonds

Explanation:

Chemical A and Chemical B react in an exothermic reaction. When Chemical A and Chemical B are mixed together more energy will be released from the old substance than the new substance will need to form its chemical bonds. Therefore, option B is correct.

When a chemical reaction goes on, energy is shifted to or from the surroundings. When energy is moved to the surroundings, this is called an exothermic reaction, and the temperature of the surroundings increases.

Examples of exothermic reactions are combustion reactions and many oxidation reactions.

A chemical reaction is exothermic if heat is passed by the system into the surroundings. Because the surroundings are deriving heat from the system, the temperature of the surroundings increases.

Thus, option B is correct.

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Answer:

Explanation:

convert 100 mg to grams = 0.100 g

o.100 grams/ 465 g X 6.02 X 10^23= 2.7993 X 10^25 molecules

465 g is the molar mass