2. What is the pH of the following solutions?
2.1. 50 mmol.dm solution of Ba(OH)2

Answer:

Extraction is the action of removing something.

Explanation:

Answer:

there are three different subatomic particles inside them: the protons, neutrons, and electrons

Answer:

Mushroom cells

Explanation:

They are mushroom cells because they are together.

Answer:

1.  Can help in development of effective medications

2.  Can help explain genetic diseases

3.  Composed of about 19,000 genes

Explanation:

The other answer options are misleading.

Genetic code of humans can help with understanding more than just human genetics.

Human genetics is composed of 23 chromosome pairs, for a total of 46 chromosomes.

Answer:

Number of molecules = 2.61  x 10²³

Explanation:

Given:

Volume of tetra-chloride = 42 ml

Density = 1.59 g/ml

Find:

Number of molecules

Computation:

Mass = Volume of tetra-chloride x Density

Mass = 42 x 1.59

Mass = 66.78

Molecular mass of tetra-chloride = 154 g/mol

Moles = 66.78 / 154

Moles = 0.4337

0.4337 mole = 0.4337 x Avogadro number

0.4337 mole = 0.4337 x 6.022 x 10²³

Number of molecules = 2.61  x 10²³

Answer:

the answer is 18,927,06.

Explanation:

I just took the test ; )

Explanation:

Label A: oceanic - oceanic

Label B: oceanic - continental

Label C: continental - continental

Answer:

Oceanic-continental convergence---- letter B.  

Oceanic-oceanic convergence ---- letter A.

Continental-continental convergence ---- letter C

plz mark brainliest

Answer:

1.7

Explanation:

The formula to be used here is;

pH = -log[H⁺]

To determine the concentration of H⁺ of the nitric acid (HNO₃), formula for molarity is used

Molarity = number of  moles/volume (in dm³ or L)

number of moles (n) = given mass/molar mass

Molar mass of HNO₃ = 1 + 14 + (16 x 3)

= 63g

given mass (in grams) = 320mg⇔0.32g (where 1000mg = 1g)

Thus; n = 0.32/63

n = 0.0051 moles

Volume of acid = 290 mL ⇔ 0.29 L (where 1000 mL = 1L)

Molarity = n/volume;

0.0051/0.29

Molarity = 0.018M

pH = -log 0.018

pH = 1.7

Answer:

The mass of object is 0.5 Kg.

Explanation:

Given data:

Acceleration of object = 12.0 m/s²

Force on object = 6.0 N

Mass of object = ?

Solution:

Formula:

F = m×a

F = force

m = mass

a = acceleration

Now we will put the values in formula.

6.0 N = m  × 12.0 m/s²

m =  6.0 N / 12.0 m/s²  

   ( N = kg.m/s²)

m = 0.5 kg

The mass of object is 0.5 Kg.

Answer:

Mass = 89.97 g

Explanation:

Given data:

Number of moles of chloride ions = 1.98 mol

Mass in grams of MgCl₂ present = ?

Solution:

we can see that 1 mole of MgCl₂ contain 2 moles of chloride ions. Thus 1.89 moles of chloride ions contain moles of MgCl₂ are,

                  Cl₂          :        MgCl₂

                   2            :          1

                  1.89        :        1/2×1.89 = 0.945

Thus, 1.89 moles of chloride ions are provided by 0.945 moles of MgCl₂.

Mass of MgCl₂:

Mass = number of moles × molar mass

Mass = 0.945 mol × 95.211 g/mol

Mass = 89.97 g

Answer:

hi

Explanation:

how r u today

Answer:

6.976%

0.0152 M

Explanation:

Step 1: Write the balanced chemical equation

Ba²⁺(aq) + H₂SO₄(aq) ⇒ BaSO₄(s) + 2 H⁺(aq)

The balanced net ionic chemical equation is:

Ba²⁺(aq) + SO₄²⁻(aq) ⇒ BaSO₄(s)

Step 2: Calculate the moles corresponding to 0.5376 g of BaSO₄

The molar mass of BaSO₄ is 233.39 g/mol.

0.5376 g × (1 mol/233.39 g) = 2.303 × 10⁻³ mol

Step 3: Calculate the moles of Ba²⁺ that produced 2.303 × 10⁻³ moles of BaSO₄

The molar ratio of Ba²⁺ to BaSO₄ is 1:1. The moles of Ba²⁺ are 1/1 × 2.303 × 10⁻³ mol = 2.303 × 10⁻³ mol.

Step 4: Calculate the mass corresponding to 2.303 × 10⁻³ moles of Ba²⁺

The molar mass of Ba²⁺ is 137.33 g/mol.

2.303 × 10⁻³ mol × 137.33 g/mol = 0.3163 g

Step 5: Calculate the mass percent of barium in the original sample

0.3163 g of barium ion were in a 4.534 g-sample. The mass percent of barium ion is:

0.3163 g/4.534 g × 100% = 6.976%

Step 6: Calculate the molar concentration barium in the 152 mL of solution

2.303 × 10⁻³ moles of barium ion were in 152 mL (0.152 L) of solution. The molarity of barium ion is:

M = 2.303 × 10⁻³ mol/0.152 L = 0.0152 M

Answer:true

Explanation:

The neutrons and the protons are what stay there

Answer:

[tex]0.000056[/tex]

Explanation:

If [tex]pH[/tex] is given then hydronium ion concentration is equal to [tex]-log[H_3O^+][/tex]

The hydronium ion concentration can be found from the pH using the following formula:

Hydronium ion concentration = [tex]10^{-pH}[/tex]

As the pH of a HClO4 solution was measured as 4.251,

put [tex]pH=4.251[/tex]

So,

Concentration of HClO4 in the solution = [tex]10^{-4.251}=0.000056[/tex]

Answer:

Hope it help you

Stayhomestaysafe

Plz mark my answer brainliest✍️✍️

Explanation:

Primary succession is the series of community changes which occur on an entirely new habitat which has never been colonized before. For example, a newly quarried rock face or sand dunes. Secondary succession is the series of community changes which take place on a previously colonized, but disturbed or damaged habitat.

REAL NAME - SHRESTH DUBEY

Answer:

fkv  SFHHHHHHHHHCB FSSSSZCHJjjjb .SFFHHHHHHHHC

Explanation:

What do you notice about the relationship between the force strength and the size of the velocity change?

Uuuuuuu

Answer:

a. First order.

b. [tex]k=3.7x10^{-3}s ^{-1}[/tex]

c. [tex]t_{1/2}=187.3s[/tex]

d. [tex][A]=0.111M[/tex]

Explanation:

Hello.

a. In this case since the slope is in s⁻¹ we can infer that the lineal form of the rate law is:

[tex]ln[A]=-kt+ln[A]_0[/tex]

Which is also:

[tex]y=mx+b[/tex]

It means that the reaction is first-order as slope equals the negative of the rate constant which also has units of first-oder reaction.

b. Since the slope is −3.7 x 10−3 s−1 the rate constant is:

[tex]k=-m\\\\k=-(-3.7x10^{-3}s ^{-1})\\\\k=3.7x10^{-3}s ^{-1}[/tex]

c. For first-order reactions, the half-life is:

[tex]t_{1/2}=\frac{ln(2)}{k}\\ \\t_{1/2}=\frac{ln(2)}{3.7x10^{-3}s^{-1}}\\\\t_{1/2}=187.3s[/tex]

d. In this case, since the integrated first-order rate law is:

[tex][A]=[A]_0exp(-kt)[/tex]

The concentration once 220 seconds have passed is:

[tex][A]=0.250Mexp(-3.7x10^{-3}s^{-1}*220s)\\\\[/tex]

[tex][A]=0.111M[/tex]

Regards.

Answer:

There are 40.25 days in 5.75 weeks

Answer: 40.25

Hope this helped! :)

Answer: it should be 2.8

Explanation:

Answer:

Can be used to do work,and it can be converted to potential.

Explanation:

Answer: can it be used to do work

Explanation:

Answer:

coochie man? lol it's probably D or B :D

Answer:

Quantitative Observations

Explanation:

Answer:

0.840

Explanation:

The 100 grams of KBr have been equivalent to 0.84 moles. Thus, option A is correct.

The moles can be defined as the mass of the compound with respect to the molecular mass. The moles can be given as:

Moles = [tex]\rm \dfrac{weight}{Molecular\;weight}[/tex]

The molecular weight has been the mass of the constituents of the atoms present in the compound.

The compound KBr has a molecular mass of 119 g/mol.

The given mass of the compound has been 100 grams.

The moles of KBr can be given as:

Moles of KBr = [tex]\rm \dfrac{100}{119}[/tex]

Moles of KBr = 0.84 moles.

The 100 grams of KBr have been equivalent to 0.84 moles. Thus, option A is correct.

For more information about the moles, refer to the link:

https://brainly.com/question/2437143

Answer:

20 degree and 4000000N

Answer:

1 × 10⁻² M

Explanation:

Step 1: Given data

Absorptivity of a dye (ε): 1 × 10² cm⁻¹M⁻¹

Absorbance (A): 1.0

Length of the cuvette (l): 1 cm

Concentration of a dye (C): ?

Step 2: Calculate the concentration of the dye

We will use Beer's Law.

A = ε × l × C

C = A / ε × l

C = 1.0 / 1 × 10² cm⁻¹M⁻¹ × 1 cm

C = 1 × 10⁻² M

The concentration of the dye is 1 × 10⁻² M.

Answer:

The total number of atoms is 12 + 22 + 11 = 45, so carbon atoms are 12/45 of the total.

Explanation:

Answer:

- The two gases will mix and react.: FALSE.

- The two gases will remain separate and will not mix: FALSE.

- The two gases will occupy a volume of 5.0 L and the final pressure in the -two bulbs will be 6.50 atm.: FALSE.

- The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 3.50 atm.: TRUE.

- The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 3.25 atm: FALSE.

Explanation:

Hello.

In this case, given the options, since the total volume of the container includes the both of them, we find that:

- The two gases will mix and react: FALSE, since we do not know the identity of the gases which could be the same or two different inert gases.

- The two gases will remain separate and will not mix: FALSE, since as the valve is opened, the total gas will occupy the entire volume as the volume of a gas is the same to the container based on its constant molecules movements.

- The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 6.50 atm: FALSE, since in this case, by using the Boyle's law for the first compartment we obtain the pressure of the gas there:

[tex]P_2V_2=P_1V_1\\\\P_2=\frac{P_1V_1}{V_2} =\frac{2.00atm*2.00L}{5.00L} =0.8atm[/tex]

Now, we reuse it for the gas at the 3.00-L bulb to find its final pressure:

[tex]P_2V_2=P_1V_1\\\\P_2=\frac{P_1V_1}{V_2} =\frac{2.00atm*3.00L}{5.00L} =2.7atm[/tex]

So the final pressure is:

[tex]P_{TOTAL}=0.8atm+2.7atm\\\\P_{TOTAL}=3.5atm[/tex]

- The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 3.50 atm: TRUE considering the total pressure computed above.

- The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 3.25 atm: FALSE since the final pressure is 3.5 atm.

Regards.

Answer:

Yes

Explanation:

Or maybe i dont really know what it mean

Answer: Here is why,

Explanation: Burning of wood is a example of both physical and chemical change. ... Another example is digestion of food ,first the food is chewed into small pieces this is a chemical change while in the actual digestion process it is chemically broken with the help of digestive enzymes and saliva