Chemical elements

Related BrainMass Solutions

• Meaning, use and calculation of empirical formulas

  The empirical formula tells us which sort of chemical elements and how many atoms of every one are necessary to form a chemical substance. But what can we do with this information? Here are two examples: 1.)

• Why is one kind of atom, carbon, so important in biology

  Carbon has unique chemical properties that allow it to combine with other elements in an extremely diverse network of combinations.

• What is an an element and how can you tell?

  Matter consists of chemical elements Sometimes in pure form Sometimes in combinations called compounds Sometimes in mixtures of compounds Everything around us is composed of matter.

• Compound or a mixture

  Tell whether the following is a property of a compound or a mixture: a) Can contain three elements in a specific ratio b) Varies in chemical composition depending on the sample size c) Can be classified as either homogeneous or heterogeneous a)

• Chemical Symbol of First 10 Atomic Numbers

  49050 Chemical Symbol of First 10 Atomic Numbers What chemical symbol is used as the equivalent of 2superscript 1subscript H? Name and give the chemical symbols for the elements with the first 10 atomic numbers.

• Characteristic chemical differences between metals and non-metals, corresponding phosphorus and arsenic compounds

  Expanded Octet rule… When you are talking about elements not in the first row, they are able to expand their octet, and bond to more than 4 other elements at one time. Think methane CH4 vs SiCl6, or in this case NH4+ vs. PCl6.

• Trophic Level, Diet Energy, Group IIA, Chemical Bonds & More

  Research and report on the following properties of all elements on the periodic table in Group IIA: physical properties of each element (color, texture, mass) and chemical properties of the elements (density, crystal shape, etc.).

• Hydrogen sulfide is composed of two elements: hydrogen and sulfur

  483500 Hydrogen Sulfide Elements Hydrogen sulfide is composed of two elements: hydrogen and sulfur. In an experiment, 6.500 g of hydrogen sulfide is fully decomposed into its elements.

• Atoms and Elements

  42318 Atoms and Elements All atoms of a given element have the same __________.

• mole and formula weight

  The initial substances that undergo change in chemical reaction are called what? 3. The law that states that atoms are neither created nor destroyed in a chemical reaction, but may be rearranged, is called what? 4.