Karteikarten
Chemistry
Karten in diesem Stapel (34)
- 1What is a hypothesis?A proposition made as a basis for reasoning, without any assumption of its truth.
- 2What is the difference between a physical and chemical change?Physical: a change in the size, state, or shape of a substance (Does not create a new substance).
Chemical: a change that results in a new substance. - 3What are the 6 clues of a chemical change?1. Heat or light is made or absorbed
2. A new smell
3. A new colour
4. A gas is produced (bubbles)
5. difficult to reverse
6. Precipitate is produced (solid) - 4Differentiate between the terms qualitative and quantitative.Qualitative: descriptions, can be observed but not measured, colours, textures, smells, tastes, appearance, etc.
Quantitative: numbers, can be measured, length, height, area, volume, weight, speed, time, temperature, etc. - 5What happened in the gas tests (oxygen, hydrogen, carbon dioxide)?Oxygen: It relit.
Hydrogen: There was a high pitched popping sound.
Carbon dioxide: It extinguished and there was smoke. - 6What is matter?Anything that has mass and volume.
- 7How is matter classified?Pure substance: made up of only one type of matter (one type of particle). Ex. elements, compounds
Mixtures: made up of 2 or more types of matter (particles). Ex. mechanical mixture: you can see the different types of matter, solutions: one substance dissolved in another. - 8What does the particle theory of matter state?1. All matter is composed of particles.
2. All particles have space between them.
3. The particles are always in motion.
4. The particles are attracted to each other.
5. Particles of the same substance are the same. - 9How are elements arranged in the periodic table?The elements are listed from left to right and from top to bottom by atomic number
- 10What are the properties of metals?-most elements are metals
-most metals are shiny, grey/silver in colour
-malleable and ductile
-ex. silver, sodium, and mercury - 11Describe the structure of the atom.I
- 12How do you know how many protons, neutrons, or electrons an atom has?Find the atomic number (this will tell you the number of protons and electrons), then calculate the number of neutrons by subtracting the atomic number from the mass number.
- 13Metalloids-elements with metallic and non-metallic properties
-can conduct energy, but poorly
-used as semi conductors
-ex. silicon - 14Draw a Bohr-Rutherford Diagram of potassium.
- 15Periodic table of the elements-created by Dmitri Mendeleev
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- 16What is mass?A measure of the quantity of matter in an object.
- 17What is volume?A measure of how big an object is of how much space a fluid takes up.
- 18How many elements occur naturally on earth?Approximately 90.
- 19What is a compound?A thing that is composed of 2 or more separate elements.
- 20What are the changes of state?Melting, evaporation, condensation, freezing, sublimation, deposition.
- 21What is melting?A change from a solid to a liquid at a melting point.
- 22What is evaporation?A change from a liquid to a gas.
- 23What is condensation?A change from a gas to a liquid.
- 24What is freezing?A change from a liquid to a solid.
- 25What is sublimation?A change from a solid directly to a gas.
- 26What is deposition?A change from a gas directly to a solid.
- 27What is a physical property?Physical: describes the characteristics of a substance that can be observed or measured. Ex. colour, density : the amount (mass) in a given volume, transparency: transparent, translucent, opaque, lustre: how shiny a substance is, conductivity: how well electricity passes through a substance (conductive or not conductive (insulative)), malleability: can be formed into different shapes (malleable or not malleable).
- 28What is a chemical property?The ability of a substance to change when mixed with other substances. Ex. reacts with water, acid, iodine,oxygen, flammability.
- 29Non-metals-do not resemble metals
-only 17 elements
-11 are gases, 5 are solids and 1 is a liquid
-ex. sulfer - 30What are the 2 types of compounds that can be formed?Ionic, molecular
- 31What types of elements are involved in ionic compounds?metal + nonmetal
- 32What types of elements are involved in molecular compounds?non-metal + non-metal
- 33What state are ionic compounds at room temperature?Solid
- 34What state are molecular compounds at room temperature?Liquids, gases
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- Karteikarten am Chemistry, erstellt von oliviagibson77 am 27/01/2016.
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