Gas pressure is caused by

Chemistry

1 answer:

Rainbow [258]3 years ago

7 0

Answer:

It's a rapid motion and collisions of molecules with the walls of the container that causes pressure.

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Choose the correct answer. The difference between the mass number of an isotope and its atomic number is:

lisabon 2012 [21]

The difference between the mass number of an isotope and its atomic number is number of neutrons.

<h3>What is atomic mass? </h3>

Atomic mass is defined as the sum of number of protons and number of neutrons of an element.

Atomic mass is represented by A.

<h3>What is Atomic number?</h3>

Atomic number is defined as the number of electron in an element.

Atomic number is represented by Z.

<h3>What is Isotopes? </h3>

Isotopes are the element which have same atomic number but have different atomic mass.

Number of proton is equal to number of electrons.

Proton is positively charged, electrons are negativity charge while neutrons are neutral in nature.

Proton and neutrons are present in the nucleus of an element. On the other hand, electron revolves around the nucleus.

For example:

The atomic mass of¹⁶₈O is 16, while of ¹⁷₈O is 17.

Neutrons = atomic mass - atomic number

Neutrons of ¹⁶₈O = 16-8 = 8

Neutrons of ¹⁷₈O = 17-8 = 9

So, they have different atomic mass and number of neutrons.

Thus, we concluded that the difference between the mass number of an isotope and its atomic number is number of neutrons.

learn more about atomic mass:

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3 0

2 years ago

En los espacios en blanco escribe si la reacción es de síntesis, análisis, simple sustitución o doble sustitucion

Artist 52 [7]

I really can’t help sorry

6 0

3 years ago

A piece of aluminum weighing 10.0 grams is placed into a graduated cylinder that has an initial volume (before immersion) of 35.

padilas [110]

Answer:

The density of the metal sample is 2.70 $\frac{grams}{mL}$

Explanation:

Density is a magnitude that allows you to measure the amount of mass in a given volume of a substance. Then, the expression for the calculation of density is the ratio between the mass of a body and the volume it occupies:

$d=\frac{m}{V}$

Density, according to the International System of Units, is usually expressed in kilograms per cubic meter (kg / m3) or gram per cubic centimeter (g / cm3). Although it can also be expressed in any other unit of mass by volume.

So, for the calculation of density you know that:

mass of the sample= 10 grams
volume of the sample = volume on the cylinder after immersion - volume on the cylinder before immersion= 38.7 mL - 35.0 ml = 3.7 mL

Then:

$d=\frac{10 grams}{3.7 mL}$