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ser-zykov [4K]
3 years ago
15

You’re probably familiar with the sour taste of acidic lemon juice and the slippery feel of alkaline (basic) soap. In fact, thes

e characteristics were used to identify acids from bases long ago. Today, we understand much more about acidity and alkalinity, far beyond taste and feel. Acids are most simply defined as proton donors. They have a ph of below 7. They are substances that react with water to produce H3O+ (hydronium) ions (after all, H2O + one proton → H3O+ ). When you add an acid to water the water acts as a base, accepting protons from the acid. Bases are most simply defined as proton acceptors. They have a ph of above 7. They react with water to produce OH- (hydroxide) ions (H2O - one proton → OH-). When you add a base to water the water acts as an acid, donating protons to the base.1. Citric acid H3C6H5O7 is the substance that gives lemon juice and other citrus fruit juices a sour taste. How many grams of citric acid are present in 125mL of a 0.400M citric acid solution?
Chemistry
1 answer:
Nimfa-mama [501]3 years ago
5 0

Answer:

9.606 grams of citric acid are present in 125 mL of a 0.400 M citric acid solution.

Explanation:

Molarity : It is defined as the number of moles of solute present in one liter of solution.  Mathematically written as:

Molarity=\frac{\text{Moles of solute}}{\text{volume of solution in L}}

Moles of citric acid  = n

Volume of the citric acid  solution = 125 mL  =125 × 0.001 L= 0.125 L

(1 mL = 0.001L)

Molarity of the citric acid  solution = 0.400 M

0.400 M=\frac{n}{0.12 5L}

n  = 0.400 M × 0.125 L = 0.05 moles

Mass of 0.05 moles of citric acid :

0.05 mol\times 192.12 g/mol=9.606 g

9.606 grams of citric acid are present in 125 mL of a 0.400 M citric acid solution.

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In the formula for the compound XCl4, the X could represent<br> (1) C (3) Mg<br> (2) Η (4) Zn
Anvisha [2.4K]
Correct Answer: option 1 i.e. C

Reason: 
The the compound of interest i.e.  XCl4, since there are 4 Cl atoms bonded to X. This signifies that the valency of X is 4.

There atomic number of C is 6. It's electronic configuration is giving by 1s2 2s2 2p2. Thus, there are 4 electrons in valence shell of C. This signifies that valency of C is 4. Hence the compound present in present case is CCl4.
7 0
3 years ago
Read 2 more answers
Type the correct answer in the box.
IgorLugansk [536]

Answer:

a= <em>In scientific notation</em>

6.96000×10⁵ Km

b =<em>In  expanded notation</em>

0.00019 mm

Explanation:

Given data:

Radius of sun = 696000 Km

size of bacterial cell = 1.9 ×10⁻⁴ mm

Radius of sun in scientific notation = ?

Size of bacterial cell in expanded notation = ?

Solution:

Scientific notation is the way to express the large value in short form.

The number in scientific notation have two parts.

. The digits (decimal point will place after first digit)

× 10 ( the power which put the decimal point where it should be)

for example the number 6324.4 in scientific notation will be written as = 6.3244 × 10³

Radius of sun:

696000 Km

<em>In scientific notation</em>

6.96000 × 10⁵ Km

The expanded notation is standard notation of writing the numerical values which is normal way. The numbers are written as they are, without the power of 10.

Size of bacterial cell:

1.9 ×10⁻⁴ mm

<em>In  expanded notation</em>

1.9/ 10000 = 0.00019 mm

3 0
3 years ago
Consider the addition of an electron to the following atoms from the fourth period. Rank the atoms in order from the most negati
lesya [120]

Answer:

Ge: [Ar] 3d10 4s2 4p2 => 6 electrons in the outer shell

Br: [Ar] 3d10 4s2 4p5 => 7 electrons in the outer shell

Kr: [Ar] 3d10 4s2 4p6 => 8 electrons in the outer shell

Explanation:

The electron affinity or propension to attract electrons is given by the electronic configuration. Remember that the most stable configuration is that were the last shell is full, i.e. it has 8 electrons.

The closer an atom is to reach the 8 electrons in the outer shell the bigger the electron affinity.

Of the three elements, Br needs only 1 electron to have 8 electrons in the outer shell, so it has the biggest electron affinity (the least negative).

Ge: needs 2 electrons to have 8 electrons in the outer shell, so it has a smaller (more negative) electron affinity than Br.

Kr, which is a noble gas, has 8 electrons and is not willing to attract more electrons at all, the it has the lowest (more negative) electron affinity of all three to the extension that really the ion is so unstable that it does not make sense to talk about a number for the electron affinity of this atom.

Read more on Brainly.com - brainly.com/question/1832586#readmore

6 0
3 years ago
I need filling the blank spots ​
AnnZ [28]

Answer:

have you tried c

Explanation:

the chicken and I don't know if you can make it

4 0
2 years ago
PLEASE HELP!! How could using either more or less of a chemical in a scientific experiment cause a change in results?
charle [14.2K]
The chemical could have more or less of a reaction to the other chemicals in the experiment
4 0
3 years ago
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