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Compounds
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- In chemistry, we refer to these as compounds, which we define as a substance that results from the combination of two or more elements in a constant ratio.
Compounds require chemical means to separate them into elements and/or simpler compounds. Sodium chloride, also known as table salt, is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions. It is commonly used as a condiment and food preservative.
- Chemical Formulas
A chemical formula is an expression that shows the elements...
- Chemical Formulas
When we mix two different pure substances together, like this, it’s a mixture. This is now a mixture of the elements iron and sulfur. The different elements are not joined together.
If two atoms and not same element, then compound and molecule and not mixture. If two different molecules and evenly mixed, then homogeneous mixture. If two different substances and differentiable on the molecular level, then heterogeneous mixture.
A molecule consists of two or more atoms of the same element, or different elements, that are chemically bound together. Note that the two nitrogen atoms which comprise a nitrogen molecule move as a unit.
- The Basics – Molecules, Mixtures, & Compounds
- Molecules & Compounds
- Mixtures – A Bit of This and That
- A Chemical by Any Other Name…
- Taking It Further – Kinetic Theory & Change
- Try These Projects That Use Compounds and Mixtures
The universe is made up of atoms, the tiny building blocks of matter. This computer screen is made of atoms, as are your eyes, the rest of your body, and the floor underneath you! In the last 110 years, scientists have discovered that atoms themselves consist of smaller particles. An atom has a central nucleus made up of protons and neutrons, surro...
When atoms from different elements are joined together in groups, they form molecules. The atoms in molecules bind together chemically, which means that the atoms cannot be separated again by physical means, such as filtration. The molecule has different properties from the elements from which is was made. A water molecule is not three separate ato...
All matter can be classified into two categories: pure substances and mixtures. A pure substanceconsists of a single element or compound. Iron is formed only of iron (Fe) atoms; table salt is formed only by sodium chloride (NaCl) molecules. A mixture, however, is made up of different compounds and/or elements. When salt is added to water to make sa...
The chemical formulafor a molecule provides us with its atomic number. That is, it tells us the elements contained within and in what proportion. For example, do you know how many atoms are in a molecule of AlSO4(aluminum sulfate)? There is one aluminum (Al), one sulfur (S), and four oxygen (O). The answer is six atoms. What is the formula for ammo...
The kinetic theory of matterstates that atoms and molecules are in constant motion and that the higher the temperature around them, the greater their speed will be. In other words, increased heat energy will make atoms and molecules move faster This ties in to the states or phases of matter. In the solid phase, atoms and molecules are close togethe...
An element is a substance that is made up of only one kind of atom. The atoms in a particular element are the same as each other, and they are different from the atoms of all other elements.
People also ask
What is the difference between a mixture and an element?
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Jul 20, 2022 · This can either be one single element or one single compound, but every sample of this substance that you examine must contain exactly the same thing with a fixed, definite set of properties. If we take two or more pure substances and mix them together, we refer to this as a mixture.
