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2 years ago

25.0cm3 of 0.10M sodium hydroxide solution is exactly neutralised by

Chemistry

1 answer:

Sergio [31]2 years ago

8 0

Answer:

25.00 cm 3 of 0.100 mol/dm 3 sodium hydroxide solution is exactly neutralised by 0.125 mol/dm 3 hydrochloric acid.

your answer is B

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For each of the following units and concentration values, mention if they are parts per million (ppm), parts per billion (ppb) o

arsen [322]

Answer:

a) ppm

b) ppm

c) ppb

d) ppt

e) ppb

Explanation:

a) You know that 1000 g are 1 kg, and 1000 kg are 1 ton, so (1000)*(1000) g are 1 ton, so 1,000,000 grams are one ton.

b) 1000 mg are 1 g, and 1000 g are 1 liter, so 1,000,000 grams are one liter.

c) You know that 1000 ug are 1 mg, so with the b), we just need to multiply the answer by 1000, so 1,000,000,000 ug are 1 liter.

d) The same as c, 1000 ng are 1 mg. So we are talkinf of ppt.

e) 1000 mg are 1 g. And 1000 g are 1 kg, then 1000 kg are one ton. So 1,000,000,000 mg are one ton.

7 0

3 years ago

Why do doctors worry more about a fever of a couple of degrees Celsius than a fever of a couple of degrees Fahrenheit

weeeeeb [17]

Because Celcius is a larger amount than Fahrenheit. The units are farther apart.

8 0

4 years ago

Read 2 more answers

3 points

VLD [36.1K]

Answer:

<h3>The answer is 8.29 %</h3>

Explanation:

The percentage error of a certain measurement can be found by using the formula

$P(\%) = \frac{error}{actual \: \: number} \times 100\% \\$

From the question

actual density = 19.30g/L

error = 20.9 - 19.3 = 1.6

We have

$p(\%) = \frac{1.6}{19.3} \times 100 \\ = 8.290155440...$

We have the final answer as

Hope this helps you

5 0

4 years ago

Fill in the missing information:

Neko [114]

Answer: 1. Complete Nuclear Symbol : $_{22}^{48}{Ti^{4+}}$

2. Atomic number : 22

3. Mass number : 48

4. Charge : 4 +

Explanation:

Atomic number is equal to the number of protons.

Mass number is the sum of number of neelectrons. utrons and number of protons.

Given : no of protons = 22 , thus atomic number = 22

Mass number = number of neutrons + number of protons

Mass number = 26 + 22 = 48

Also for a neutral atom , the number of protons is equal to the number of electrons. But here electrons are 4 less than protons, which means the atom has lost 4 electrons and thus will have a charge of 4+.

The atomic number is specific to an element, and the element with atomic number 22 is Titanium (Ti). The representation is $_{22}^{48}{Ti^{4+}}$

3 0

3 years ago

Melting can be best described as a process in which molecules

Savatey [412]

Gain enough kinetic energy to get past each other. Ad you heat up a substance, the temperature increases as does the kinetic energy of the particles. At a point the temperature of the substance will stop increasing. The energy is now being used to increase the potential and move the particles further apart.

5 0

3 years ago

Read 2 more answers