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3 years ago

A lab director asks two students, Lydia and Damien, to each select a bottle of a concentrated weak base. When they reach the

Chemistry

2 answers:

Hunter-Best [27]3 years ago

6 0

Answer:

First one is 5.0 M ammonia and the Second one ?

Explanation:

lana [24]3 years ago

4 0

Answer:

It is the one that has 8.0 in the second blank in the answer for brainly

Explanation:

I just took it and got 5/5 and guessed on the second but I can’t remember what the full answer was

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How does an object look when it is viewed through an opaque object

Alexxx [7]

You can not see between opaque materials because light cannot pass through them.

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2 years ago

A sample of oxalic acid (a diprotic acid of the formula H2C2O4) is dissolved in enough water to make 1.00 L of solution. A 100.0

OleMash [197]

Answer: The mass of original oxalic acid sample is 6.75 grams

Explanation:

To calculate the concentration of acid, we use the equation given by neutralization reaction:

$n_1M_1V_1=n_2M_2V_2$

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of acid which is $H_2C_2O_4$

$n_2,M_2\text{ and }V_2$ are the n-factor, molarity and volume of base which is NaOH.

We are given:

$n_1=2\\M_1=?M\\V_1=100.0mL\\n_2=1\\M_2=0.750M\\V_2=20.0mL$

Putting values in above equation, we get:

$2\times M_1\times 100.0=1\times 0.750\times 20.0\\\\M_1=\frac{1\times 0.750\times 20.0}{2\times 100.0}=0.075M$

To calculate the mass of solute, we use the equation used to calculate the molarity of solution:

$\text{Molarity of the solution}=\frac{\text{Mass of solute}}{\text{Molar mass of solute}\times \text{Volume of solution (in L)}}$

Given mass of oxalic acid = ? g

Molar mass of oxalic acid = 90 g/mol

Molarity of solution = 0.075 M

Volume of solution = 1.00 L

Putting values in above equation, we get:

$0.075M=\frac{\text{Mass of oxalic acid}}{90g/mol\times 1L}\\\\\text{Mass of oxalic acid}=(0.075\times 90\times 1)=6.75g$

Hence, the mass of original oxalic acid sample is 6.75 grams

7 0

3 years ago

Which mineral can be found in the rocks phyllite, sandstone, and granite?

Dominik [7]

Answer:

1 quartz

Explanation:

pls tell me if I'm wrong

6 0

3 years ago

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Select the true statements about protein secondary structure.

netineya [11]

Answer:

The α‑helix is held together by hydrogen bonds between the amide N−H and C=O groups.

Disulfide bonds stabilize secondary structure.

Explanation:

Proteins have primary, secondary, tertiary and quartinary structures.

The secondary structure of a protein is the regular, recurring sequence of amino acid in a polypeptide chain. Secondary structure of proteins give rise to the folding observed in the structure of a protein.

The major secondary structures of a protein are α-helices and β-structures.

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3 years ago

What is the mass of a steel cylinder that has a density of 75.0 g/mL and a volume of 12 mL?

siniylev [52]

hey there!:

density = 75.0 g/mL

Volume = 12 mL

mass = ?

Therefore:

D = m / V

75.0 =m / 12

m = 75.0 * 12

m = 900 g

Answer B

5 0

3 years ago

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