Overview

In Glogpedia

by zozo09
Last updated 5 years ago

Discipline:
Science
Subject:
Chemistry
Grade:
8

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Overview

Dose Matter Matter?an introductionYes, of corse matter matters! Everything around us is made of matter! People, air, water and even your breakfast are all made out of matter. Anything you can see, touch, taste or smell is matter. matter is made out of tiny particles called atoms and may come in four diffrent states - solid, liquid, gas and plasma (gas at extremly high temperatures). e.g SOLID- phone, animals, soil, earth LIQUID- water, coke-a-cola, ink GAS- oxygen, carbon dioxide, bubbles in soft drinks PLASMA- in stars, fire etc. Matter can change state from liquid to gas etc. by: freezing (solid to liquid) melting (liquid to solid) condensation (liquid to gas) vaporisation (gas to liquid) sublimation (gas to solid/solid to gas) heating (gas to plasma)SOLIDParticles are squashed togetherhas a definate shape and volumecannot be compressedLIQUID Particles spaced a little space apartdose not have a deffinate shape but has a deffinate volumetakes the shape of its containercannot be compressedGASParticles are very spaced apartCan be compressedno deffinate shape or volumeFilles the space it is givenmatter has a number of chemical/physical properties and can undergo chemical/physical changes/reactions. All of wich are vital for everyday life.During this time we did numerous experaments such as stacking liquid (wich was really cool) and making slime (wich was a complete fail). We also made several glogs!

THE UNIVERSE IS MADE OF 92 NATURAL ELEMENTS AS WELL AS MANY OTHERS! There are all diffrent elements that make up the universe. Similar to using ingredents to make a cake.These elements can be classified in diffrent gorupes. While some elements may only last a few seconds others may last for a long time. In class we diden't do an awful lot but what we did was fun and sure came in handy later during our chemistry unit.MOLECULESMolecules form when an element wants to become stable. When molecules bond they can eyther bond with a metal to a gas, wich is called lonic. Or a gas to a gas, wich is called convelant. When two or more of the same type of atoms bond it is called a molecular element. When two or more diffrent types of atoms bond it is called a molecular compound. In class we made oragami molecules and made them stable by bonding them together with skewer sticks to make molecular compounds and elements.

I Have Learned...

About Chemistry

Variables are used when graphing data and in experaments as well as similar things like that.Some important things to note is that their are two diffrent types of variables:indipendent variable and dependent variable. In an experament the independent variable is controlled (kept the same) so to keep the experament fair. While graphing the indepentent variableis usally placed apon the X axis. The dependent variable, during an experament is the one we are measuring for data. This is not controlled (allowed to be diffrent for results). While graphing the dependent variable is usaly placed upon the Y axis.For Example -Testing how fast trees grow under diffrent conditions. To make this experament fair you must take the same type of seed and plant them in the same type of soil and place them in diffrent spots wich recieve diffrent ammounts of sun. You then measure the plants height onck a week. The independent variable is the weekly intervals on and between the measuring times. The dependent variable is growth rate of the tree as it is dependent on the position of the tree.our class carried out an experament to graph the results. the experament was to jog on the spot for a certian ammount of time and to then take our pulse. the independent variable is the jog time and the dependent variable is the beats per minute.here are some other notes on graphing and variables -TREND: a trend is a pattern the data on the graph makes. A positive trend is when the data is going up on the graph. A negative trend is when it is going down. having no trend is when the data has a completly random pattern. (no pattern.)LINE OF BEST FIT:A line of wich gusses what the trend for the data is in a scatter plot graph. When drawing in a line of best fit you must try to make it pass through as many of the points as possible. However, their must be just as many points on the line as their are above and below the line.INTERPOLATION:An innacurate way of making new data points inside of the graph.EXTRAPOLATION:An innacurate way of making new data points outside of the graph.

Chemistry is going on around us every day and it is not just chemists who are doing it. We rely so much on chemistry in our everyday lives. While cooking, making glue, manufacuring products, pretty much anything that is making something new out of an already existing substance. Chemists do alot of work in this area. Chemists do everything from selling medicine to making medicine to manufactoring products or making explosions on film sets. Chemical reactions are everywhere and nealy any manufactored product that you use was produced by a chemist.

references:

Oxford big ideas. Science 8 : Australian Curriculum Sally Crash, Geoff Quinton, Craig Tilley, Helen Silvester My BrainMy science book

Physical and chemical reactions chemical reactions are basicly the same as chemical changes.(you can see in my other glogs that I prefer chemical reactions and my favorite chemical reaction is color fire.) A physical change/physical reaction is when an the molecules that make up an object are re-arranged to look a diffrent way. A chemical change/reaction is when a new substance is added to an already existing one and a completly new substance is formed. For example. In class we peformed an experament where over a bunson burner we heated chocalate until it melted. This is a physical change because you are changing what the chocolate looked like not what it was. We then heated chocolate until it burnt. This is a chemical change as it changes the actual chocolate not just what it looked like. Their are numerous diffrent ways you can tell wether there has been a physical or chemical change.

chemistry (again)

Elements

In class we did an experament where we set copper sulphate, sodium carbonate, boric acid and a mystery item alight and observed what color they burned. Traditionaly this is done with diffrent elements, but is just as good to do with simple household chemicals and salts. We learnt about electrons getting 'excited' and going into a higher energy shell. It then releases a proton as well as diffrent colors depending on how much energy it has in relation to the light spectrum. Sometimes the colors are invisable to the human eye.This may sound confusing but the more you think about it the more sence it makes!

Chemistry

Color Fire

Chemical Equations

In class we learnt to balance chemical equations. There are rules to follow!Numbers in front of elements or compounds are called coefficents.(coefficants can be changed) Subscripts tell us how many elements or compounds there are.(subscripts cannot be changed)Reactants are on the left of the equation and products are on the right.---> means yealds (equals)e.g.Mg-magnesumO-oxygenMg+O2--->MgOTo make this balanced we:2Mg+O2--->2MgO

Variables

The Element song

Matter


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