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4 years ago

Match the three phases of matter.

Chemistry

1 answer:

Ratling [72]4 years ago

7 0

Answer:

2, 1,3

Explanation:

Matter is divided into three states

Solid

Liquid

Gas

Solid: it has a fixed volume and shape.

Liquid: it has a fixed volume and variable shape, that's is it takes the shape of the container.

Gas: it has a variable volume and shape.

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Which step of mitosis involves the nucleus splitting and nuclear membranes forming around each new nucleus?

guapka [62]

“telophase” because it’s the only step that actually involves the cell to physically split, and it also involves the forming of a nuclear membrane

Hope this helps :)

6 0

3 years ago

Read 2 more answers

Which of the following is NOT a "big idea" in chemistry?

aalyn [17]

B but im not sure if im 100% correcr

8 0

3 years ago

unknown element x has a mass number of 88 and contains 50 neutrons in the atom. element x is strontium

AnnyKZ [126]

Strontium element has a mass number of 88 and contains 50 neutrons in the atom.

Given that;

Mass number of element X = 88

Number of Neutrons in element X = 50

we know the concept that Mass number is represent as total number of Neutrons and proton present in Nucleus

So, Mass number of element X = Number of Neutrons in element X + Number of Protons in element X

Thus, 88 = 50 + Number of Protons in element X

Number of Protons in element X = 38

As, Number of proton = Atomic number

So, Atomic number of element X = 38

Hence Unknown Element X is Strontium

To know more about Strontium element visit here ; brainly.com/question/19298437?referrer=searchResults

#SPJ4

5 0

2 years ago

Determine the pH of the resulting solution if 25 mL of 0.400 M strychnine (C21H22N2O2) is added to 50 mL of 0.200 M HCl? Assume

DIA [1.3K]

Answer:

pH = 4.56

Explanation:

The strychnine reacts with HCl as follows:

C₂₁H₂₂N₂O₂ + HCl ⇄ C₂₁H₂₂N₂O₂H⁺ + Cl⁻

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For strychnine buffer:

pOH = 5.74 + log [C₂₁H₂₂N₂O₂H⁺] / [C₂₁H₂₂N₂O₂]

Initial moles of C₂₁H₂₂N₂O₂ are:

0.025L * (0.400 mol / L) = 0.01 moles C₂₁H₂₂N₂O₂

And of HCl are:

0.05L * (0.200 mol / L) = 0.01 moles HCl

That means after the reaction, you will have just 0.01 moles of C₂₁H₂₂N₂O₂H⁺ in 50mL + 25mL = 0.075L. And molarity is:

[C₂₁H₂₂N₂O₂H⁺] = 0.01 mol / 0.075L = 0.1333M

This conjugate acid, is in equilibrium with water as follows:

C₂₁H₂₂N₂O₂H⁺(aq) + H₂O(l) ⇄ C₂₁H₂₂N₂O₂ + H₃O⁺

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<em>Where Ka = Kw / Kb = 1x10⁻¹⁴ / 1.8x10⁻⁶ = 5.556x10⁻⁹</em>

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Ka is defined as:

Ka = 5.556x10⁻⁹ = [C₂₁H₂₂N₂O₂] [H₃O⁺] / [C₂₁H₂₂N₂O₂H⁺]

In equilibrium, concentrations are:

C₂₁H₂₂N₂O₂ = X

H₃O⁺ = X

C₂₁H₂₂N₂O₂H⁺ = 0.1333M - X

Replacing in Ka expression:

5.556x10⁻⁹ = [X] [X] / [0.1333M - X]

7.39x10⁻¹⁰ - 5.556x10⁻⁹X = X²

7.39x10⁻¹⁰ - 5.556x10⁻⁹X - X² = 0

Solving for X:

X = - 2.72x10⁻⁵M → False solution. There is no negative concentrations

X = 2.72x10⁻⁵M → Right solution.

As H₃O⁺ = X

H₃O⁺ = 2.72x10⁻⁵M

And pH = -log H₃O⁺

4 0

3 years ago

Calculate the pH of milk with a hydrogen ionconcentration of 4.25 x 10^-7 mol dm-3. Show all steps ofyour calculations and inclu

yulyashka [42]

Answer:

6.37.

Explanation:

What is given?

[H (+)] = 4.25 x 10⁻⁷ mol/dm³

Step-by-step solution:

First, let's see the formula to calculate the pH based on the hydrogen ion concentration (H (+)):

$pH=-log\lbrack H^+].$

*Logarithm must be in base 10!

Our given concentration of hydrogen ion is 4.25 x 10⁻⁷ mol/dm³. Remember that the units of concentration must be in M (mol/L) but in this case, 1 dm³ equals 1 L, so based on this, we have that:

$4.25\cdot10^{-7}\frac{mol}{dm^3}=4.25\cdot10^{-7}\frac{mol}{L}.$

So, we can replace this value in the formula of pH:

$pH=-log\lbrack4.25\cdot10^{-7}]\approx6.37.$

The pH of milk would be 6.37 which means that is slightly acid (weak acid).

5 0

1 year ago