Education & Communication 2024, October

To pass the general chemistry exam, you must have understood the fundamentals, have a good knowledge of basic mathematics, know how to use a calculator for complex equations and have the desire to learn something really different. Chemistry studies matter and its properties.

A freshwater aquarium can become very salty over time. Certain fish foods and tap water can add surprising amounts of salt to the aquarium in a very short period of time. During the hot season a lot of water evaporates, but the dissolved calcium and salt remain in the tank as much as the chlorides.

There atomic mass is the sum of the masses of all protons, neutrons and electrons present in a single atom or molecule. The mass of an electron is so small that it is considered negligible and therefore is not included in the calculation. The term is also often used to refer to the average atomic mass of all isotopes of an element, although this use is technically incorrect.

Atoms are too small units to allow accurate measurements of chemicals. When it comes to working with exact quantities, scientists prefer to group atoms into units called moles. One mole is equal to the number of atoms present in 12 g of the isotope-12 of carbon and is equivalent to approximately 6.

Organic chemistry has a bad reputation; it is not uncommon for students to hear horrible stories about the difficulties they face before passing this exam. Although it is a complex matter, "organic chemistry" is basically not a nightmare as it is often portrayed.

Termite is an incendiary mixture used in welding for melting metals. It burns at around 2,200 ° C and can melt most metals. Extreme caution is required when handling termite. You need to remove any flammable or combustible materials from the area, and make sure you don't leave anything under the termite or else you're in trouble!

Maybe you bought a silver item on an untrustworthy site, or a friend of yours gave you a piece they found somewhere. Maybe you just want to check out some family heirlooms that you're not entirely sure about. Whatever reason you have, you will need to know how to test for silver.

Are you studying the basics of chemistry? Do you feel a little lost in the world of this science? Nobody is born a chemist. To become one, or to be a brilliant student in this subject, it is enough for you to develop your intuition for chemistry.

If the periodic table of the elements seems like a big headache, know that you are not alone in having this problem! Understanding how it works can be difficult, but learning to read it will help you tremendously in science subjects. To begin, look at its structure and the information it gives about the chemical elements, then move on to study each element;

In chemistry, mass percentage indicates the percentage of each component of a mixture. To calculate it, you need to know the molar mass of the elements present in the mixture in grams / mole or the number of grams used to make the solution. You can get this value simply by using a formula, which divides the mass of the component (or solute) by the mass of the mixture (or solution).

Matter exists in three different states: solid, liquid or gaseous. Follow this scientific experiment to see how it is possible to change the state of a given solution or compound using different methods, from very simple to very complex ones.

In chemistry, the valence electrons of an element are found in the outermost electron shell. The number of valence electrons in an atom determines the types of chemical bonds that atom will be able to form. The best way to find valence electrons is to use the table of elements.

In chemistry, mass percentage indicates the percentage of each component of a mixture. To calculate it, you need to know the molar mass of the elements in the mixture in grams / mole or the number of grams used to make the solution. You can get this value simply by using a formula, which divides the mass of the component (or solute) by the mass of the mixture (or solution).

In chemistry, the terms "oxidation" and "reduction" refer to reactions in which an atom (or group of atoms) loses or acquires electrons, respectively. Oxidation numbers are numbers assigned to atoms (or groups of atoms) that help chemists keep track of how many electrons are available for transfer and check whether certain reactants are oxidized or reduced in a reaction.

The periodic table of elements is a very useful tool to know, regardless of whether the date for an exam is approaching or you just want to learn something new. Memorizing all 118 elements can seem quite complex, especially since each is identified with a unique symbol and an atomic number.

The atomic number represents the number of protons within the nucleus of a single atom of an element. This value cannot change, so it can be used to derive other characteristics, such as the number of electrons and neutrons in an atom. Steps Part 1 of 2:

It is important to measure the pH of the water, i.e. its acidity or alkalinity level. The water is absorbed by the plants and animals on which we depend and we drink it ourselves. This data provides us with various information and allows us to understand if the water is potentially contaminated.

The electron is a negatively charged particle that is part of the atom. All the basic elements are composed of electrons, protons and neutrons. One of the fundamental concepts that must be mastered in chemistry is the ability to determine how many electrons there are in an atom.

Have you ever left a bottle of water exposed to the sun for a few hours and hear a "hiss" when opening it? This phenomenon is caused by a principle called "vapor pressure" (or vapor pressure). In chemistry it is defined as the pressure exerted by an evaporating substance (which turns into gas) on the walls of an airtight container.

In chemistry, "partial pressure" means the pressure that each gas present in a mixture exerts on the container, for example a flask, a diver's air cylinder or the limits of an atmosphere; it is possible to calculate it if you know the quantity of each gas, the volume it occupies and its temperature.

A variety of minerals are referred to as salts and provide sea water with its characteristic qualities. Outside of laboratory experiments, it is commonly measured by aquarium enthusiasts, and by farmers who are interested in understanding the presence of any salt clusters in the soil.

Protons, neutrons and electrons are the three main particles that make up an atom. Just as their names suggest, protons have a positive charge, electrons have a negative charge, and neutrons have a neutral charge. The mass of electrons is very small, while that of neutrons and protons is practically identical.

Hydrocarbons, or compounds made up of a chain of hydrogen and carbon, are the basis of organic chemistry. It is necessary to learn to name them according to the IUPAC nomenclature, or International Union of Pure and Applied Chemistry, which is the currently accepted method for naming hydrocarbon chains.

The study of chemistry, like that of other scientific subjects in which mathematics is widely used, requires commitment and effort. It is necessary to learn equations, formulas and graphs; some concepts need to be learned by heart, while others require a deep understanding of chemical structures and mathematical equations.

If you need to find the molecular formula of a mysterious compound within an experiment, you can do the calculations based on the data you get from that experiment and some key information available. Read on to learn how to proceed. Steps Part 1 of 3:

Molarity describes the ratio of moles of a solute to the volume of a solution. For a more detailed explanation on how to find molarity by having moles, liters, grams, and / or milliliters, read on. Steps Method 1 of 4: Calculate the Molarity with Moles and Volume Step 1.

All chemists, biologists, environmentalists and laboratory technicians use pH to measure the acidity or alkalinity of a solution; the pH meter, or pH meter, is very useful and represents the most accurate instrument to measure this value. There are many simple steps, ranging from the preparation of the materials to the methodical calibration of the instrument and its use, which guarantee to obtain measurements with the highest possible precision;

You may be familiar with dry ice because you use it around Halloween or during the summer to keep drinks cold. Dry ice has multiple uses and is particularly useful if the freezer breaks. Carbon dioxide in solid form is known as dry ice. When it dissolves, it reverts to the gaseous state in the form of carbon dioxide, which is colorless and tasteless.

To obtain sodium acetate you just need a few ingredients that are easily available in the kitchen. It is fun and practical to use and you can use it to make "hot ice" and / or hot ice sculptures. You can also put it in some bags to use as reusable hand warmers.

Copper sulfate is an inorganic compound commonly found in pesticides to kill bacteria, algae, plants, snails and fungi. It is the result of the combination of sulfuric acid and cupric oxide; it is also used to develop bright blue crystals as a fun science experiment.

Citric acid is available to the public through several sales channels. The place where you decide to buy it depends on the use you want to make of it and the quantity you need. It is a weak acid that industry and ordinary people often use because it is a preservative, a chelator and has a sour taste.

Dry ice is solid carbon dioxide and reaches very low temperatures. It lends itself to various uses, although the most obvious is to keep objects cold. One of the advantages of dry ice is that it leaves no traces of liquid as it sublimes, that is, it returns to the gaseous state when it reaches a temperature of -78.

All chemical reactions (and therefore all chemical equations) must be balanced. Matter cannot be created or destroyed, so the products resulting from a reaction must match the participating reactants, even if they are arranged differently. Stoichiometry is the technique that chemists use to ensure that a chemical equation is perfectly balanced.

You can easily make basic chemical solutions both at home and at work and in different ways; whether you want to make them from a powdered compound or by diluting another liquid, you can easily determine the correct doses of each substance and solution to use.

Cyanuric acid is a chlorine stabilizer commonly used in outdoor swimming pools. The presence of this substance is fine as long as it is in the range of 30 to 50 ppm (parts per million). You should periodically check the concentration of cyanuric acid in the pool water to make sure it is within these values.

In chemistry, the mole is a standard unit of measurement that refers to the individual elements that make up a substance. Often the quantities of the compounds are expressed in grams, therefore needing to be converted into moles. You'll get a clearer picture of the number of molecules you work with if you make this conversion instead of using weight, which can vary from one molecule to another.

This article will teach you how to build a smoke bomb. It's by far the best recipe, and even beginners will make smoke bombs in no time. Steps Step 1. Calculate 60 grams of potassium nitrate and 40 grams of sugar If you don't have a scale, don't worry - the ratio is 3 parts of potassium nitrate to every 2 parts of sugar, so you can use a teaspoon or something.

Carbon dioxide, better known as carbon dioxide, is a gas consisting of one carbon and two oxygen atoms, represented by the chemical symbol CO 2 . It is the molecule that creates bubbles in carbonated drinks and often also in alcoholic ones, which makes bread rise, characterizes the propellant of some aerosols and the foam of fire extinguishers.

Calling it a science experiment would not be correct (it is a demonstration!), But no matter what we want to call it, an explosion is a great way to have fun with science! Whether you are looking for a serious science project or you just want to have fun using your brain, there are many ways to create different types of explosion.

You are in a chemistry lab and you need to do a distillation. There is a possibility that you need to use a Bunsen burner to heat the liquid mixture until it boils. In fact, Bunsen burners are the most used heat source in elementary, organic or inorganic chemistry laboratories.