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3 years ago

Is hydrogen gas a mixture or pure substance?

Chemistry

1 answer:

Akimi4 [234]3 years ago

8 0

Answer:

pure hydrogen is a pure substance even though it consists of many different types of molecules. what makes it pure substance is that it is free from contamination.

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State the number of protons, electrons and neutron

skad [1K]

Answer:

You didn't show which element it is. The proton is the atomic number, the electron is the same number of protons, and the neutron is the atomic mass rounded to the nearest whole number minus the proton.

Explanation:

4 0

3 years ago

True or false? Enzymes in the digestive tract catalyze hydrolysis reactions.

Slav-nsk [51]

Answer:

The given statement is true.

Enzymes which are present in the digestive tract such as salivary amylase, pepsin, trypsin, et cetera mainly catalyze the hydrolysis reaction.

The hydrolysis reaction is the reaction by which large molecules are broken down into smaller molecules with the help of water.

Most of the complex molecules or nutrients such as starch, protein et cetera are broken down into their respective smaller units with the help of hydrolysis reaction.

For example, lactase catalyzes the hydrolysis of lactose into glucose and galactose.

5 0

3 years ago

Read 2 more answers

Calculate the energy(J) change associated with an electron transition from n=2 to n=5 in a Bohr hydrogen atom. Put answer in sci

Oliga [24]

The energy at n level of hydrogen atom energy level =13.6/n^2

substiture the respective n values in the equation above and find the difference in the energy levels

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3 0

3 years ago

Read 2 more answers

Which has the greater concentration of hydrogen ions, a substance with a pH of 5 or a substance with a pH of 4?

evablogger [386]

Answer:

pH 4

Explanation:

Firstly, we define pH as the negative logarithm to base 10 of the concentration of hydrogen ions.

Mathematically, we express this as:

pH = -log[H+]

Now let’s us calculate the concentration of hydrogen in each of the pH

For pH 4, we have:

4 = -log[H+]

[H+] = -Antilog(4)

[H+] = 0.0001M

For pH 5,

[H+] = -Antilog(5)

[H+] = 0.00001M

We can see that 0.0001 is greater than 0.00001 and thus it has a greater concentration of hydrogen ions

4 0

3 years ago

A brick has a mass of 100 G and a volume of 25CM3 what is the density of the brick

kumpel [21]

Answer:

$\boxed {\boxed {\sf 4 \ g/cm^3}}$

Explanation:

We are asked to find the density of a brick. Density is a substance's mass per unit volume. The formula for calculating density is as follows.

$\rho= \frac{m}{v}$

The mass of the brick is 100 grams and the volume is 25 cubic centimeters.

m= 100 g
v= 25 cm³

Substitute the values into the formula.

$\rho= \frac{ 100 \ g}{25 \ cm^3}$

Divide.

$\rho=4 \ g/cm^3$

The density of the brick is <u>4 grams per cubic centimeter.</u>

5 0

3 years ago