All substances freeze at the same temperature, so they all have exactly the
same freezing point.
O True
O False

Answer:

Explanation:

From the information given:

We can say that the rate of reaction is utilized to decide the reaction speed, and it is subject to the rate constant.

The power of concentration related to the rate equation can be said to be the order of the reaction.

For zero-order reaction: it is the reaction whose rate is free and not dependent on the reactant's concentration.  

Concentration-time reaction is given as;

[tex]\mathbf{[A] = [A_o] -kt ---- (1)}[/tex]

where;

t = time

k = rate constant

A_o = initial concentration of reactant

Thus, the plot between [A] and t needs to be a straight line.

On the other hand, The First order reaction is the reaction whose rate is straightforwardly corresponding to the reactant's concentration.  

Its concentration-time relation can be expressed as,

[tex]\mathbf{In([A])= In ([A_o])-kt ---- (2)}[/tex]

t = time

k = rate constant

[A_o] = initial concentration of the reactant

Then, the plot between [A] & t requires to be a straight line.

Presently, the plot between ln([A]) vs time appears to be in a straight line with the slope of the line equivalents to the rate constant (k).

hence,

slope = -k

Then;

[tex]\mathbf{k = -slope ---- (3)}[/tex]

Now; to discover the activation energy we need to utilize Arrhenius relation which is given as,

[tex]\mathbf{In(k) = In(K_o) - \dfrac{E_o}{RT} ---- (4)}[/tex]

From the above equation;

k_o = arrhenius parameter

Ea = activation energy

R = 8.314 J/mol.K

T = temperature in Kelvin

From the data given  for concentration vs time;

t[min]      Ca(mol/L)

0                      2

5                     1.6

9                     1.35

15                   1.1

22                    0.87

30                    0.7

40                    0.53

60                    0.35

a)

Since we can deduce the order of the reaction,

Let's assume that it is a zero-order reaction, Thus, the plot of Ca vs t can be seen in the first image attached below;

From the diagram, it is clear and obvious that it is NOT a straight line.

Thus, we conclude that this order is NOT a zero-order.

However, let also assume that order is first order,

Now, from the second diagram showing the plot of ln(Ca) vs t, we can deduce that it is a straight line which implies that it is the order of the reaction is first order.

Therefore, the equation for the first order is given as;

[tex]\mathbf{In([A]) = In ([A_o])- kt}[/tex]

Recall that: the slope of the ln(A) v/s time will result in a rate constant,

Thus, from the graph we have;

slope = -0.0289 mol/L.min and:

slope = - k

Hence;

rate constant = k = 0.0289 mol/L.min and the order = 1st order

b)

On the off chance that we need to take more data points, we will like to take the data point in the scope of 40 min to 60 min time interval, on the grounds that the significant deviation is seen there. more information focuses will imply more accuracy.

Answer:

it decreases

Explanation:

because its false

Answer:

True

Explanation:

The pressure will increase because the heat will make the molecules move around and spread out more.

If you want I could go into more detail with the explanation.

Answer:

Hope this helps

Explanation:

Answer:

1 mol. = 0.169 mol He.

Answer:

[tex]pH=11[/tex]

Explanation:

Hello there!

In this case, since the ionization of the described base is:

[tex]base+H_2O\rightarrow OH^-+baseH^+[/tex]

Thus, the equilibrium expression in terms of the reaction extent is:

[tex]Kb=5.86x10^{-6}=\frac{x^2}{0.187-x}[/tex]

Thus, by solving for x we obtain:

[tex]5.86x10^{-6}({0.187-x})=x^2\\\\1.10x10^{-6}-5.86x10^{-6}x-x^2=0[/tex]

So the values of x are:

[tex]x_1=0.0010M\\x_2=-0.0010M[/tex]

So the feasible answer is 0.0010 M, thus we compute the pOH:

[tex]pOH=-log(0.0010M)=3[/tex]

And therefore the pH:

[tex]pH=14-pOH=14-3\\\\pH=11[/tex]

Best regards!

Answer:

B

Explanation:

the group number is=valence electrons. element 1 is in group 1 element 18 is in group 8. 1<8

Answer:

the answer is b

Explanation:

i just know

☁️ Answer ☁️

annyeonghaseyo!

Your answer is:

it can bond with oxygen to form rust or iron oxide. and it can bond with carbon to form steel.

Here's another one: Iron bonds with lots of things: Oxygen (Ferric Oxide = rust),Chlorine (Ferric Chloride]), Fluorine, ... , even other Iron (in aMetallic Bond or crystal).

Hope it helps.

Have a nice day hyung/noona!~ ￣▽￣❤️

Answer:

A structure that can lessen erosion is a plant cover :3

Explanation:

:3

Answer:

the answer is b mitosis in humans

Answer:

3.54 mol

Explanation:

When at STP (Pressure of 1 atm & T of 273.16 K), one mol of any given gas occupies 22.4 liters.

With the above information in mind we can calculate the number of moles, using the factor 22.4 L/mol:

79.2 L ÷ 22.4 L/mol = 3.54 mol

There are 3.54 moles of the gas present in the container.

Answer:

and can cause changes in motion. Inertia.

Explanation:

Answer:  change its motion.

Explanation: hope this helps :)

Answer:

[KOH] = 0.10M in KOH

Explanation:

Molar Concentration [M] = moles solute/volume solution in liters

moles KOH = 0.56g/56g/mole = 0.01mole

Volume of solution = 100cm³ = 100ml = 0.10 liter

[KOH] = 0.01 mole KOH / 0.10 liter solution = 0.10M in KOH

Answer:

1.0 atm

Explanation:

Step 1: Given data

Step 2: Convert the temperatures to the Kelvin scale

We will use the following expression.

K = °C + 273.15

T₁: K = 0°C + 273.15 = 273 K

T₂: K = 44°C + 273.15 = 317 K

Step 3: Calculate the initial pressure of the balloon

We will use the combined gas law.

P₁ × V₁ / T₁ = P₂ × V₂ / T₂

P₁ = P₂ × V₂ × T₁ / T₂ × V₁

P₁ = 0.97 atm × 4.25 L × 273 K / 317 K × 3.45 L = 1.0 atm

Answer: The first plastic based on a synthetic polymer was invented in 1907.  Plastic sticks around in the environment for ages, threatening wildlife and spreading toxins.

Answer:

molar mass CO = 28.01 g/mol

3.45 x 10^2 x 28.01 =9.66 x 10^3 g

mass Zn = 2.45 x 10^-2 x 65.39 g/mol=1.60 g => 1.60 x 10^0

Explanation:

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One mole of cobalt weighs 58.9 grams. Hence the mass in grams of 345 moles of cobalt is 20320.5 g.

Cobalt is 27th element in periodic table. It is place in d- block of periodic table and is termed as transition metal. Transition metals sows variable oxidation states.

The atomic number of cobalt is 27. Thus, it contains 27 protons and 27 electrons. The mass number is 57. The mass of a given number of moles of an element can be calculated by multiplying its atomic mass by number of moles.

The atomic mass of cobalt = 58.9 g/mol

The mass of one mole of cobalt is 58.9 g/mol.

Thus, the mass of 345 moles of cobalt is calculated as follows:

mass of 345 moles of Co = 345 mol × 58.9 g/mol = 20320 g.

Therefore, the mass of cobalt in 345 moles is 20320 grams.

To find more on cobalt, refer here:

https://brainly.com/question/1549014

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Answer: .768

Explanation:

I didn’t get this one right but that’s the answer.

Answer:

the answer is d

Explanation:

top right corner

Answer: 90 degrees        .

Answer:

A and C

Explanation:

so D

Answer:

266.3 g

Explanation:

The balanced reaction is:

First we convert 2.3 moles of AlPO₄ to moles of Li₃PO₄, using the stoichiometric coefficients:

Then we convert Li₃PO₄ moles into grams, using its molar mass:

Answer:

I think a red flower with one part colored yellow

Explanation:

a red flower with one part colored yellow

Answer:

B. They Increase the [OH-]

Explanation:

Have a great day! :)

Taking into account the definition of the Arrhenius theory of acids and bases, the correct answer is option B. "Bases increase the concentration of hydroxide ions [OH⁻]"

An Arrhenius acid is defined as chemical substances that contain hydrogen, and that when dissolved in water produce a concentration of hydrogen ions or protons (H⁺), increasing the concentration of H⁺ in the solution.

That is, according to Arrhenius theory, an acid is a substance that dissociates H⁺ ions in aqueous solution.

On the other hand, according to this Theory, a Arrhenius base is any substance that, when dissolved, releases hydroxyl ions (OH⁻).

So, the correct answer is option B. "Bases increase the concentration of hydroxide ions [OH⁻]"

Learn more about Arrhenius Theory:

brainly.com/question/15444181

brainly.com/question/15387513

brainly.com/question/16032044

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Answer:

True true false true true true flase, false

Explanation:

Answer:

Eukarya

Explanation:

Organisms in the domain Eukarya keep their genetic material in a nucleus and include the plants, animals, fungi, and protists.

Answer:

C po Hope it helps salamat