1892321
| Frage | Antworten |
| What does WHMIS stand for? | Workplace Hazardous Materials Information System |
| What is Atomic mass? | The mass of an atom |
| What is and Atomic Number? | The number of protons and electrons in an atom |
| what is a compound? | a pure substance composed of two or more different elements |
| what is a molecule? | two or more atoms of the same or different elements that are chemically joined |
| what is a mixture? | a substance made of at least two different particules |
| what is a Diatomic Molecule? | Element that cant exist on its own |
| what is a pure substance? | a substance that is made of one type of particule |
| what is an element? | cannot be broken into a simpler substance |
| what is a chemical family? | elements that share similar properties |
| what is a period? | a row on the periodic table |
| what is a metal? | is lustrous, malleable, ductile and conducts heat and electricity |
| what is a non- metal? | usually a gas or a dull powdery solid that does not conduct heat or electricity |
| what is a metalloid? | has properties of both metals and non-metals |
| what is a heterogeneous mixture? | combination of two or more pure substances (i.e. Pizza) |
| What is a homogeneous mixture? | A mixture that you can see the different componants |
| what is ionic bonding? | the process of losing or gaining an atom |
| What is covalent bonding? | when two non-metals share electrons |
| what is a molecular formula? | Water (H20) |
| what are examples of Physical properties? | Colour, Texture, lustre, brittleness, hardness |
| what are examples of Physical Changes? | A changed state (liquid to gas), diluted colour change |
| what are examples of Chemical Properties? | Fizzing, Bubbling, light produce |
| what are examples of Chemical change? | New substance is formed, distinct colour or odour change |
| What does an atom consist of? | Protons, Electrons and Neutrons |
| what is an Isotopes? | it is when there is a different amount of protons and neutrons |
| why is an atom neutral? | it is neutral because there is an equal amount of protons and eletrons |
| what is the particle theory? | 1.) all matter is made up of small particles 2.) different substances are made up of different kids of particles 3.) particles are always moving 4.) the particles move faster as temp. increases 5.) particles attract each other |
| what are the families of the periodic table? | -alkali metals -alkaline earth metals -transitional metals -halogen metals -noble gases |
| where are Valence electrons located? | they're located in the outer shell |
| what is a cation? | a positively charged ion |
| what is an anion? | a negatively charged ion |
| what is an autotroph? | a producer |
| what is a heterotroph? | a consumer |
| what is a trophic level? | the level of an organism in an ecosystem |
| what is Earth's atmosphere made up of? | 78% nitrogen, 21% oxygen and 1% argon, water vapour and carbon dioxide |
| what is the word equation for cellular respiration? | = - light energy Sugar + Oxygen= Carbon Dioxide + Water + Energy |
| what is the word equation for Photosynthesis? | = - Light energy Carbon Dioxide + Water = Sugar + Water |
| why is cellular respiration and photosynthesis considered to be complimentary processes? | Because Photosynthesis takes Carbon Dioxide and releases Oxygen, whereas Cellular Respiration takes Oxygen and releases Carbon Dioxide |
| what is bioaccumulation? | the concentration of a substance in an organism |
| what is Bioamplification? | the increase of a substance as it moves higher up a food web |
| Why do some pesticides become resistant? | Because after a long time, the 'pests' get used to the pesticide and after a few generations, the population can become highly resistant, now you either have to use a new pesticide or a stronger one. |
| what are the 3 major biogeochemical cycles? | The Water cycle, the Carbon cycle and the Nitrogen cycle |
| summarize the events of the carbon cycle | It is the long term and short term storage of carbon. |
| label the carbon cycle | |
| what are key abiotic factors in a terrestrial ecosystem? | Light availability, water availability, nutrient availability and temperature |
| what are key biotic factors? | Competition, disease agents |
| how much energy does each level receive? | each level receives ten % |
| how does fertilizer help grow plants? | fertilizers help give needed nutrients to the plants. |
| what are negative effects of using fertilizer? | it could attract unwanted visitors. |
| explain the difference between natural and synthetic fertilizers | natural fertilizers are made from plant and animal waste, while synthetic fertilizers are manufactured. |
| how do humans control 'pests'? | -crop rotation -confuse mating -harvesting at certain times -introduction of natural predators. |
| what happens when you have run-off from farms that enter nearby streams? | Fertilizers can enter aquatic ecosystems and create algal blooms |
| what is sustainability? | the ability to maintain an ecological balance |
| what is a conductor? | a material that lets electrons flow easily |
| what is an isolator? | a material that does not let electrons flow easily |
| what is an electron? | a negitively charged particle |
| what is voltage? | potential difference expressed in volts. |
| what is electric current (I)? | the rate of flow past a given point in a circuit. measured in amperes |
| what is electrical resistance (R)? | the ability to oppose the flow of current. measured in ohms (omega sign) |
| what is a series circuit? | a circuit where the current follows one path and the loads come after each other. |
| what is a parallel circuit? | a circuit where the current is divided up to two or more paths before recombining to complete the circuit. |
| what is potential difference? | the difference in potential energy. measured in volts |
| what is a charged object? | an object that exerts force. |
| what is the law of electric charges? | -like charges repel -opposite charges attract |
| what particle moves when discussing electricity? | electrons |
| what is the difference between static electricity and current electricity? | static electricity is the study of charges at rest and current electricity is the study of the flow of electric charge. |
| what is a short circuit? how is it prevented? | it is when there is too much current and can be prevent with circuit breakers or a fuse. |
| what are the four parts that make up a circuit? | -an energy source -a switch -a load - conducting wires |
| in what direction do the electrons flow in a circuit? | from the negative end to the positive end |
| what are some ways power is produced? | Hydro electricity, Wind, Light, Nuclear |
| what is an astronomical unit? | the average distance from the earth to the sun |
| what is a nebula? | the beginning of a star |
| what is a meteor? | a meteor enters the earth's atmosphere and sometimes burn completely |
| what is a meteorite? | a meteor that has crashed to the ground. |
| what is a comet? | a chunk of ice and dust that travels in a long orbit around the sun |
| what is the difference between a lunar and solar eclipse? | a solar eclipse is when the moon is between the earth and the sun; a lunar eclipse is when the earth is between the sun and the moon. |
| how are seasons created? | seasons are created when the earth's hemispheres are tilted away or towards the sun. |
| what planets are larger than earth? | Venus, Jupiter, Saturn, Uranus and Neptune |
| what is the life cycle of a star? | the star starts of as a nebula and then a star is born, when it dies, it becomes either a black whole or a white dwarf |
| how does the sun create energy? | high temperatures cause the particles to collide and cause them to fuse which gives off enormous amounts of energy |
| how does star colour relate to it's temperature? | a hot star is blue and a cold star is red. |
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