Classification of matter • All the objects and substances that we see in the world are made of matter. • This matter can be classified according to whether it is a mixture or a pure substance. • A mixture is a combination of two or more substances‚ where these substances are not bonded (or joined) to each other and no chemical reaction occurs between the substances. Examples of mixtures are air (a mixture of different gases) and cereal in milk. • The main characteristics
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Chemicals in Food Chemicals are added to food for (i) their preservation‚ (ii) enhancing their appeal‚ and (iii) adding nutritive value in them. Main categories of food additives are as follows: (i) Food colours (ii) Flavours and sweeteners (iii) Fat emulsifiers and stabilising agents (iv) Flour improvers – antistaling agents and bleaches (v) Antioxidants (vi) Preservatives (vii) Nutritional supplements such as minerals‚ vitamins and amino acids. Except for chemicals of category (vii)‚ none
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gain enthalpy and ionization energy of an atom are –a and +b eV respectively. The electronegativity of that atom on Mulliken scale is given by (A) a – b (B) (b – a )/2 (C) a + b (D) (a + b)/2 (3) The atomic radii of Li is 1.23 A0 and ionic radius of Li+ is 0.76 A0. The fraction of the volume occupied by 2s electron in Li is (A) 0.764 (B) 0.184 (C) 0.595 (D) 0.236 (4) Photons of monochromatic light having just sufficient energy to ionize Ar-atom are incidened over the
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shown nude. A) kouros B) paean C) kythara D) kore Points Earned: 4.0/4.0 Correct Answer(s):A 3. One of the Greek orders of architecture‚ elaborate and graceful in style‚ it features columns that have capitals decorated with volutes. A) Ionic B) Phrygian C) Doric D) Lydian Points Earned: 4.0/4.0 Correct Answer(s):A 4. She is Odysseus’s ever-faithful wife who refuses to declare her husband dead and remarry one of her suitors. A) Athena B) Penelope C) Sappho D) Hera Points
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IRON (METAL) Iron is a chemical element with the symbol Fe (from Latin: ferrum) and atomic number 26. It is a metal in the first transition series. It is the most common element (by mass) forming the planet Earth as a whole‚ forming much of Earth’s outer and inner core. It is the fourth most common element in the Earth’s crust. Iron’s very common presence in rocky planets like Earth is due to its abundant production as a result of fusion in high-mass stars‚ Like other group 8 elements‚ iron
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Module One: Grade Nine Topics Physical Change: This is a usually reversible change in which the form of matter is altered‚ but is not chemically changed to another substance. Melting an ice cube is an example of a physical change. The ice cube changes states: from a solid to a liquid (water). You can physically see this change. No new substance is formed: the matter in the liquid is the same as it was in the ice cube. It is reversible: you can freeze the liquid to turn it back to ice.
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Chemical Reaction: Cold Packs CHM110 Chemical Reaction: Cold Packs Introduction Chemical reactions happen every day in a variety of ways. We will explore the science behind cold packs and the chemical reactions that happen at the molecular level. Furthermore‚ we will examine and explain what chemical bonds are formed‚ broken‚ or both. The product is a simple construct of two bags: one containing water (solvent) and the other a chemical compound called ammonium nitrate (NH4NO3). In order to activate
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The amazingly innovative and revolutionary culture of the Greeks is a very broad subject to say the least. The Greeks have more than enough to brag about‚ but there is one thing that the Greeks did best in my opinion. This is the field of architecture. Architecture is a way of expression that has been used by many cultures and civilizations over thousands of years. The Greek culture is by far the most beautiful and mathematically advanced culture in the field of architecture in the B
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Chemistry SCH3U Unit 1 Lesson 1 Key Questions 1. List three physical properties and one chemical property of a) an iron nail * conducts heat and electricity well * solid at room temperature * ductile * rusts in water (chemical) b) gasoline * liquid at 20deg C * boils between 20 and 200 degrees Celsius * not soluble in water * flammable in the presence of oxygen (chemical) 2. People in a workplace should have access to MSDS sheets so that * chemicals
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protons. ____ 6. Which of the following includes the others? a. protons b. neutrons c. electrons d. atoms ____ 7. What holds together the two strands of a DNA molecule? a. hydrogen bonds b. covalent bonds c. polar ionic bonds d. nonpolar ionic bonds ____ 8. The maximum number of electrons in the shell closest to the nucleus is a. four. b. eight. c. two. d. one. ____ 9. A molecule of liquid water a. is nonpolar. b. is locked in a rigid three-dimensional
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