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3 years ago

13

Ciliates often have two kinds of nuclei that have different functions. Ciliates often have two kinds of nuclei that have differe

nt functions. True False

1 answer:

LenaWriter [7]3 years ago

7 0

Answer: true

Explanation:

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How many molecules are there in 45 moles of diphosphorus trioxide?

Artist 52 [7]

Answer:

$2.71(10^{25})$ molecules

Explanation:

Remember 1 mol is equal to Avogadro's number

$45 mol (\frac{6.02(10^{23}) molecules}{1 mol})$

5 0

3 years ago

A student is asked to determine the molarity of a strong base by titrating it with 0.250 M solution of H2SO4. The students is in

Hoochie [10]

<u>Answer:</u> The concentration of hydroxide ions in the strong base solution is 0.625 M

<u>Explanation:</u>

To calculate the molarity of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in mL)}}$ .......(1)

<u>For sulfuric acid:</u>

Molarity of solution = 0.250 M

Volume of solution = (30.00 - 5.00) mL = 25.00 mL

Putting values in equation 1, we get:

$0.250M=\frac{\text{Moles of sulfuric acid}\times 1000}{25.00}\\\\\text{Moles of sulfuric acid}=\frac{0.250\times 25.00}{1000}=0.00625moles$

1 mole of sulfuric acid produces 2 moles of hydrogen ions and 1 mole of sulfate ions

Moles of hydrogen ions = $(2\times 0.00625)=0.0125moles$

<u>At pH = 7</u>

Moles of hydrogen ions = Moles of hydroxide ions = 0.0125 moles

Now, calculating the hydroxide ions in the base solution by using equation 1, we get:

Moles of hydroxide ions = 0.0125 moles

Volume of base solution = 20.0 mL

Putting values in equation 1, we get:

$\text{Molarity of }OH^-\text{ ions}=\frac{0.0125mol\times 1000}{20.0}\\\\\text{Molarity of }OH^-\text{ ions}=0.625M$

Hence, the concentration of hydroxide ions in the strong base solution is 0.625 M

5 0

4 years ago

In a particular breed of cattle a black coat is dominant over a red coat if a cow with the red coat is crossed with the black ba

Furkat [3]

It's D because a dominant Gene will take over a recessive

4 0

3 years ago

Considering 0.10 m solutions of each substance, which contains the smallest concentration of ions

mihalych1998 [28]

Question options:

A) K2SO4

B) FeCl₃

C) NaOH

D) NH₃

E) KCl

Answer:

D. NH₃

Explanation:

K2SO4 = 2 K+ + SO42-

[K+]= 2 x 1.0 = 2.0 M ; [SO42-] = 1.0 M

total concentrations of ions = 2.0 + 1.0 = <em>3.0 M</em>

FeCl3 = Fe3+ + 3Cl-

[Fe3+] = 1.0 M ; [Cl-] = 3 x 1.0 = 3.0

total concentration ions = 1.0 + 3.0 =<em> 4.0 M</em>

NaOH = Na+ + OH-

[Na+] = [OH-] = 1.0 M

total concentration ions = 1.0 + 1.0 = <em>2.0 M</em>

<u>NH3 is a weak acid so the concentration of NH4+ and OH- </u><u><em>< 2.0</em></u>

KCl = K+ + Cl-

[K+] = [Cl-] = 1.0 M

total concentration ions = 1.0 + 1.0 =<em> 2.0 M</em>

7 0

3 years ago

Please I need help with this. Whoever answers it correctly will get Brainly

Umnica [9.8K]

Answer:

its a. the one about the wolves. its not the last one, bc animals that graze (eat grass & plants) mostly eat that, and rarely eat meat

<333 now give me brainliest babe

Explanation:

7 0

3 years ago