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A compound is a substance that contains two or more elements chemically combined in a fixed proportion. The elements carbon and hydrogen combine to form many different compounds. One of the simplest is called methane, in which there are always four times as many hydrogen atoms as carbon atoms.
- 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.
Compound: two or more different atoms bonded together. Mixture: two or more different atoms together but not joined. Molecule: two particles (same or different) bonded together. Element: only 1 type of atom; this definition is applied to things both bonded and not to itself.
- 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...
The law of constant composition can be used to distinguish between compounds and mixtures of elements: Compounds have a constant composition; mixtures do not. Water is always 88.8% O and 11.2% H by weight regardless of its source. Brass is an example of a mixture of two elements: copper and zinc.
Sep 21, 2022 · A combination reaction is a reaction in which two or more substances combine to form a single new substance. Combination reactions can also be called synthesis reactions. The general form of a combination reaction is: A + B → AB A + B → AB. One combination reaction is two elements combining to form a compound.
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Mixtures. If we take two or more pure substances and mix them together, we refer to this as a mixture. Mixtures can always be separated again into component pure substances, because bonding among the atoms of the constituent substances does not occur in a mixture.
