Question 6 (4 points)
(08.02 MC)
What is the percentage by mass of solution formed by dissolving 27.0 grams of HCl in 102.0 grams of water? (4 points)
а
26.596
D
20.946
с
18.296
d
16.796

Answer:

t = 39.42 days

Explanation:

To do this, we need to use the general expression for decay rate:

R = R₀ exp(-λt)    (1)

According to the problem, decay rate of A initially is 64 times rate of B, so we can say the following:

A₀ = 64B₀   (2)

The value of λ can be determined using:

λ = ln2 / t(1/2)  (3)

Let's calculate first the value of λ for each nuclei:

For A: λ₁ = ln2 / 5 = 0.1286 day⁻¹

For B: λ₂ = ln2 / 30 = 0.0231 day⁻¹

Now, let's write an expression using (1) for each nuclei.

A = A₀ exp(-0.1286t)

A = 64B₀ exp(-0.1286t)   (3)

B = B₀ exp(-0.0231t)    (4)

We want to know the time when A = B , therefore, we can actually equals (3) and (4) and solve for t:

64B₀ exp(-0.1286t) = B₀ exp(-0.0231t)

64 exp(-0.1286t) = exp(-0.0231t)

ln(64 * exp(-0.1286t)) = ln(exp(-0.0231t))

ln64 + ln(exp(-0.1286t))= -0.0231t

4.1589 - 0.1286t = -0.0231t

4.1589 = (0.1286 - 0.0231)t

t = 4.1589 / 0.1055

So, in 39 days, the decay rates of A and B will be the same.

Hope this helps

Answer:

Cells need to divide to reproduce.

Explanation:

They go through numerous stages, such as mitosis to further replicate themselves. They can't get things done alone, so they have to work in numbers.

Answer:

Fluorine gas reacts with water.

Answer:

C

Explanation:

The correct option is option C. which is "are in motion".

All the particles inside an object have kinetic energy, which implies that the particles are moving. Kinetic energy is the force that drives an object's or its constituent parts in motion. As a result, it can be inferred from this fact that the object's particles are in motion.

Options A, B, and D are not necessarily true based on the given information. The fact that particles have kinetic energy does not imply that they contain the same atoms (option A), are hotter than their surroundings (option B), or are covalently bonded (option D). These characteristics are not directly related to the presence of kinetic energy in particles.

Therefore, option c is the correct option.

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Answer:

I think it's B. The ability of water molecules to adhere to the surfaces of objects

Matter can be classified into 2 groups, Pure substance and Mixture.

Pure substance is a type of matter with "the same physical and chemical properties throughout the sample". Examples include tin, copper, oxygen, chlorine.

Mixtures on the other hand, are two or more combined substances that can be seperated. Some examples include smog, mud, sea water and air.

Answer:

CH₄

Explanation:

To determine the empirical formula of the hydrocarbon, we need to follow a series of steps.

Step 1: Determine the mass of the compound

The mass of the compound is equal to the sum of the masses of the elements that form it.

m(CxHy) = mC + mH = 7.48 g + 2.52 g = 10.00 g

Step 2: Calculate the percent by mass of each element

%C = mC / mCxHy × 100% = 7.48 g / 10.00 g × 100% = 74.8%

%H = mH / mCxHy × 100% = 2.52 g / 10.00 g × 100% = 25.2%

Step 3: Divide each percentage by the atomic mass of the element

C: 74.8/12.01 = 6.23

H: 25.2/1.01 = 24.95

Step 4: Divide both numbers by the smallest one, i.e. 6.23

C: 6.23/6.23 = 1

H: 24.95/6.23 ≈ 4

The empirical formula of the hydrocarbon is CH₄.

Answer:

Exothermic Reactions are taking place in this question

Explanation:

The chemical reaction mentioned in this question is Exothermic reaction as it releases heat and is explosive in nature.  

In fact exothermic reactions can release both heat and light. In such reactions the total energy of the products is less than the total energy of the reactants.  

Answer:

Explanation:

The pH of a solution can be found by using the formula

[tex]pH = - log [ {H}^{+} ][/tex]

From the question we have

[tex]ph = - log(2.5 \times {10}^{ - 8} ) \\ = 7.60205[/tex]

We have the final answer as

7.6

Hope this helps you

Answer: Solubility of NaOH is greater and there are more OH- ions in solution.

Explanation: Reactions : NaOH (s) ⇒ Na+ (aq) + OH- (aq)

Mg(OH)2 (s) ⇒ Mg2+ (aq) + 2 OH-(aq)

Although in same amount of moles, Mg(OH)2 produces

two (OH-)-ions in water solution, solubility of Mq(OH)2 is smaller.

Concentration [OH-]ions is smaller in saturated  water solution

of Mg(OH)2

Answer:

See answer below

Explanation:

The picture below will show you the final product and mechanism.

In the first step, the NaNH₂ is a strong base, so, this base will substract the hydrogen from carbon 2, to generate a negative charge there, and then, carbon 2 becomes a nucleophyle.

As a nucleophyle it will attack to the CH₃I in the next step, and it will attach to the CH₃.

The second step is just a regular step to reduce the triple bond of the alkyne to alkane or alkene, this will depend on the quantity of the reactant. In this case, an alkene.

Hope this helps,,,,,,k

Answer:

i think its 7.4

Explanation:j

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Answer:

1280.5g

Explanation:

Answer:

(1) Income Associated with the Production Process

(a) Compensation of employees

(b) Taxes and subsidies on products and

production .

(2) Property Income

(a) Investment income:

• Dividends and withdrawals from income of

quasi-corporations

• Reinvested earnings

• Interest

(b) Rent .

I hope this is correct :-)

Answer:

Solution given:

8.

4 hydrogen 1 oxygen

9.

4 hydrogen

2oxygen

Required reaction is:

2H2+O2➔2H2O

now

10.

oxygen have 16 amu than total mass in the left side of oxygen is:

16×2=32 amu of Oxygen

11.

total mass of Oxygen in product side is;

16×2=32 amu of Oxygen

Galileo disproved the Ptolemaic theory, sanctioned for centuries by the Church, which held the Earth to be the central and principal object in the universe, about which all celestial objects orbited.

The new evidence led scientists to change their minds about the geocentric model is that the Sun and stars move across the sky in the same direction everyday. They appear to be going around the Earth. However, Galileo observed moons which orbited Jupiter. This suggests that not everything orbits the Earth and that the geocentric model is not correct.

Geocentric model is any theory of the structure of the solar system (or the universe) in which Earth is assumed to be at the centre of it all.

This model is  often named Ptolemaic model after its most famous supporter, the Greco-Roman astronomer Ptolemy.

The geocentric is often referred to as the Medieval view of the universe and it dominated thinking into the early modern age.

Therefore, The new evidence led scientists to change their minds about the geocentric model is that the Sun and stars move across the sky in the same direction everyday. They appear to be going around the Earth. However, Galileo observed moons which orbited Jupiter. This suggests that not everything orbits the Earth and that the geocentric model is not correct.

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Answer:

Explanation:

We want the energy required for the transition:

CO  2 ( s ) + Δ → C O 2 ( g )

Explanation:

We assume that the temperature of the gas and the solid are EQUAL.

And thus we simply have to work out the product:

2 × 10^ 3 ⋅ g × 196.3 ⋅ J ⋅ g − 1  to get an answer in  Joules  as required.

What would be the energy change for the reverse transition:

C O 2 ( g ) + → C O 2 ( s ) ?

Answer:

im not entirely sure but its 3, pentalnol

Hexanol will be the least miscible in the water. Option D is correct.

What is Solubility?

It is the property of a compound to form a homogenous mixture when mixed with a liquid solvent.

The solubility of alcolol is reduced with an increase in the length of the carbon chain.

Therefore, hexanol will be the least miscible in the water because it has the largest carbon chain among the given molecules.

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Answer:

The activated complex

Explanation:

The activated complex are the species that exists maximum in every energy profile of a reaction.

Activated complex is nothing but an intermediate state of reactants formed during its conversion from a reactant to product state in coarse of reaction.

The activated complex is formed at the maximum energy level in the reaction path. And this difference between energy of the activated complex and the energy of the reactants is only known as activation energy

Answer: The molarity of iodide ions in given solution is 0.181 M.

Explanation:

Given: Mass = 1.97 g

Volume = 34.2 mL (1 mL = 0.001 L) = 0.0342 L

Molar mass of [tex]ZnI_{2}[/tex] = 319.22 g/mol

Moles is the mass of substance divided by its molar mass. Hence, moles of [tex]ZnI_{2}[/tex] are calculated as follows.

[tex]Moles = \frac{mass}{molar mass}\\= \frac{1.97 g}{319.22 g/mol}\\= 0.0062 mol[/tex]

Molarity is the number of moles of a substance present in liter of a solution.

So, molarity of given solution is calculated as follows.

[tex]Molarity = \frac{moles}{Volume (in L)}\\= \frac{0.0062 mol}{0.0342 L}\\= 0.181 M[/tex]

Thus, we can conclude that molarity of iodide ions in given solution is 0.181 M.

Answer:

francium or cesium

Answer:

321.6 g/Mol

Explanation:

mass of solvent in kilograms = 90g/1000 = 0.09 Kg

Given that;

ΔTf = Kf . m . i

Where;

Kf = freezing point constant = 4.25 °C/Kg mol

m = molality of the solution

i = Van't Hoff factor = 1 (since the substance is molecular)

ΔTf = freezing point of pure solvent - freezing point of solution

freezing point of pure solvent = 3 °C

ΔTf = 3 °C - 2.1 °C

ΔTf = 0.9  °C

0.9= 4.25 * 6.13/M/0.09 * 1

0.9= 26.0525/M * 1/0.09

0.9 = 26.0525/0.09 M

0.9 * 0.09M = 26.0525

M = 26.0525/0.9 * 0.09

M= 321.6 g/Mol

Answer:

38.4 mol LiOH

Explanation:

Step 1: Write the balanced neutralization equation

2 LiOH + CO₂ ⇒ Li₂CO₃ + H₂O

Step 2: Establish the appropriate molar ratio

According to the balanced equation, the molar ratio of LiOH to CO₂ is 2:1.

Step 3: Calculate how many moles of lithium hydroxide are required to react with 19.2 mol CO₂

19.2 mol CO₂ × 2 mol LiOH / 1 mol CO₂ = 38.4 mol LiOH

Answer:

I don't think it works like that dawg

Answer:

The three major categories of energy for electricity generation are fossil fuels (coal, natural gas, and petroleum)

Explanation:

:)

Answer: Synthesis

Explanation:

Whenever two reactants react to form one product, it is a synthesis.

Answer:

a. 497g H2SO4.

b. 124g HNO3

Explanation:

Molality, m, is an unit of concentration defined as the moles of solute per kg of solvent.

a. The moles of solute, H2SO4 are:

1.16kg * (4.37mol / kg) = 5.07 moles H2SO4

Mass -Molar mass H2SO4: 98g/mol-

5.07 moles H2SO4 * (98g / mol) = 497g H2SO4

b. The moles of solute, HNO3 are:

1.97kg * (1.00mol / kg) = 1.97 moles HNO3

Mass -Molar mass HNO3: 63.01g/mol-

1.97 moles HNO3 * (63.01g / mol) = 124g HNO3

Answer:

Biodiversity can be seen within species, between species, and within and between ecosystems. Although biodiversity is hard to measure on a global scale, in recent years there has been scientific consensus that the planet’s biodiversity is in decline. That’s not great news, because in general, the more species that live in an area, the healthier that ecosystem is—and the better off we humans are.

Explanation:

Answer: A: The smoother the ramp surface, the greater the car's speed.

Explanation: I did the USA test prep