n° = 20 e- = 18 2- D) Ca E) S ____________________________________________________________________________ 5) What mass in grams does 2.87 moles of sodium atoms have? 25 A) 1.39 x 10 B) 66.0 C) 8.01 D) 1.39 x 10 24 E) 1.73 x 10 24 ____________________________________________________________________________ 6) How many potassium atoms are contained in 15 g of potassium? 23 26 24 A) 2.3 × 10 B) 3.5 × 10 C) 9.0 × 10 D) 1.6 × 10 24 25 E) 3.3 × 10 ____________________________________________________________________________
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Properties of Water Introduction: Water’s chemical description is H2O. As the diagram to the left shows‚ that is one atom of oxygen bound to two atoms of hydrogen. The hydrogen atoms are "attached" to one side of the oxygen atom‚ resulting in a water molecule having a positive charge on the side where the hydrogen atoms are and a negative charge on the other side‚ where the oxygen atom is. This uneven distribution of charge is called polarity. Since opposite electrical charges attract‚ water
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Chapter 5: Electrons In Atoms A. Models of the atom i. The Development of Atomic Models Protons and neutrons make up a nucleus surrounded by electrons Rutherford’s model or theory ( figured electrons move around the nucleus) His theory didn’t explain why metals or compounds of medals give off characteristics of colors when heated. Also didn’t explain why the atomic model could not explain the chemical properties of elements ii. The Bhor Model Bohr proposed that an electron is found in specific
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plants‚ animals and humans became endangered by the rise in temperatures and carbon levels. It was then that Carla‚ a carbon atom was born at the Sahara desert. At night‚ Carla and her friends went outside to watch the stars peacefully. It had never occurred to them that the night would bring a sudden kidnap. All of Carla’s friends and Carla were attached to two oxygen atoms. Unfortunately‚ Carla fainted during the kidnap so when she woke up‚ she took the surprise of no longer being carbon but carbon
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What is meant by the term Nature/ Nurture? These two terms are used to the individual behaviour in a physiological perspective. Nature is described to be the inherited characteristics individual obtains from their parents e.g. this could be hair colour. On the other hand Nurture is defined to be the influences of society are what shape the individuals characteristics. There are different opinions and views that people have on the nature verses nurture for example we inherit genes from both
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Atoms make up everything around us‚ including ourselves. They consist of protons which give off a positive charge‚ electrons which give off a negative charge and neutrons which have no charge. In an atom there are the same amount of protons as there are electrons. If there weren’t it would cause the atom to behave differently. Atoms have layers around them called shells which contain electrons. Each shell can only hold a certain amount of electrons. Molecules can be multiple atoms of the same element
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Edible Atom Summary Sulfur Element number 16 on the periodic table of elements is sulfur. Sulfur is known as a brimstone‚ meaning “burning stone.” This is because it is found in deposits near volcanoes‚ and it burns very easily. It is found naturally around hot springs‚ volcanoes and in meteorites. Sulfur is also a mineral that you will find in all the cells of the human body. Sulfide bonds are the key bonds that allow curly hair to stay curly‚ and if you ever get a “perm” they add sulfide bonds
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compounds is first due to the fact that every word on the list is an organic compound‚ as they are essential to life processes. Next‚ carbohydrates‚ lipids‚ proteins‚ and nucleic acids are all macromolecules‚ as they are very large molecules composed of thousands of atoms or more. The map then divides into the four biomolecules. Carbohydrates are composed of monosaccharides‚ disaccharides‚ and polysaccharides. Proteins are made of amino acids‚ which are themselves made of polypeptides and peptide bonds
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10/27/13 Periodic Table Lab Chemistry Purpose: Finding the general properties of elements through tests and then being able to organize the metals‚ nonmetals‚ and semimetals on the periodic table. The purpose of this lab was achieved. As a class we were able to take the elements and then test them to find out their individual properties. We were then able to
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unique chemical properties. Atom: The smallest particles with unique chemical identities. Nucleus: Center of an atom (composed of protons and neutrons). Proton: Have a single positive charge (+1). Neutron: Have no charge. Electron: Tiny particles with a single negative charge and very low mass (-1)/determines chemical bonding properties of an atom. Atomic Number: Number of protons in the nucleus. Atomic Mass: Approximate number of protons and neutrons equal to total. Isotope: Atoms of same element
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