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Natuurwetenskappe

Materie, meting en reaksies

Materie en meting

Opvoeder afdeling

Memorandum

Opdrag 1:

1. Materie is die boustof waarvan alle dinge gemaak is.

2. Natuurlik: staal; diamante; koper; graniet; katoen; yster

Sinteties: plastiek; glas; seep; nylon; rubber

Definisies: Atoom: Die kleinste deeltjie waaruit alle materie opgebou is.

Element: ‘n Stof wat uit slegs een soort atoom bestaan.

Molekule: ‘n Groepie atome wat saam ‘n eenheid vorm wat die kenmerke van die betrokke stof toon.

Verbinding: ‘n Stof wat uit twee of meer atome bestaan en in ander stowwe gedeel kan word.

Leerder afdeling

Inhoud

Skeikunde vorm ‘n onderafdeling van die leerarea Natuurwetenskappe. Skeikunde is die wetenskap wat handel oor die samestelling en kenmerke van stowwe (materie). Dit staan ook bekend as Chemie en ons almal beoefen dit elke dag. Indien jy in die oggend vir jouself koffie maak of springmielies skiet, is jy besig om chemie te gebruik.

Aktiwiteit: om die terme materie, atome, molekule, elemente en verbindings te kan beskryf [lu 2.2]

1. Wat is materie?

Materie is die wetenskaplike naam vir die boustof waarvan alle dinge gemaak is. Alle voorwerpe op die aarde is van materie gemaak, bv. die boek waaruit jy lees, die tafel waarop jy skryf of die lug wat jy inasem. Dis egter nie net die nie-lewende dinge wat van materie gemaak is nie, maar ook die lewende dinge soos plante en diere.

Opdrag 1:

1. Skryf nou in jou eie woorde neer wat materie is:

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2. Alhoewel baie nie-lewende stowwe natuurlik voorkom, moet dit eers gesuiwer of verwerk word voordat dit gebruik kan word. Voorbeelde hiervan is yster wat eers van ystererts geskei moet word en olie wat eers geraffineer moet word. Ander stowwe word weer gemaak deur verskillende grondstowwe, bv. katoen, hout en wol te meng en te behandel. Hierdie stowwe staan as sintetiese stowwe bekend.

Klassifiseer die volgende stowwe as natuurlik of sinteties. Omsirkel die natuurlike stowwe en onderstreep die sintetiese stowwe.

staal; plastiek; glas; diamante;
koper; seep; graniet; nylon;
rubber; goud; suurstof; yster;
sout; asyn; leer; koffie

Atome, molekules, elemente en verbindings

Alle materie in die wêreld bestaan uit baie klein deeltjies of partikels. Dit word atome genoem; dit is die kleinste deeltjies waaruit materie opgebou is en kan slegs mikroskopies waargeneem word. ‘n Hoeveelheid atome word saamgevoeg en vorm ‘n molekule net soos ‘n klomp bakstene saam ‘n muur vorm.

‘n Element is ‘n stof wat uit slegs een soort atoom bestaan. ‘n Element kan dus nie in enigiets anders verdeel word nie. ‘n Verbinding is ‘n stof wat uit twee of meer soorte atome bestaan en in ander stowwe gedeel kan word. Sommige van hierdie stowwe kan elemente wees . Water is die algemeenste verbinding wat ons ken. Water bestaan uit die elemente waterstof en suurstof.

Die verskil tussen elemente en verbindings kan ook gesien word as die verskil tussen ‘n brood en sy bestanddele. Die “elemente” is die bestanddele van die brood, nl. suurdeeg, eiers, water, meel en bakpoeier. Die “verbinding” is die brood wat van hierdie bestanddele gebak is.

Beskryf die volgende terme in jou eie woorde:

Atome: ______________________________________________________________

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_____________________________________________________________________

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Element: _____________________________________________________________________

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Molekule: ____________________________________________________________

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_____________________________________________________________________

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Verbinding: __________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

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Assessering

Leeruitkomste 2: Die leerder ken, interpreteer en pas wetenskaplike, tegnologiese en omgewingskennis toe.

Assesseringstandaard 2.2: Dit is duidelik wanneer die leerder inligting kan kategoriseer: vergelyk kenmerke van verskillende kategorieë voorwerpe, organismes en gebeurtenisse.

Questions & Answers

how did you get 1640
Noor Reply
If auger is pair are the roots of equation x2+5x-3=0
Peter Reply
Wayne and Dennis like to ride the bike path from Riverside Park to the beach. Dennis’s speed is seven miles per hour faster than Wayne’s speed, so it takes Wayne 2 hours to ride to the beach while it takes Dennis 1.5 hours for the ride. Find the speed of both bikers.
MATTHEW Reply
420
Sharon
from theory: distance [miles] = speed [mph] × time [hours] info #1 speed_Dennis × 1.5 = speed_Wayne × 2 => speed_Wayne = 0.75 × speed_Dennis (i) info #2 speed_Dennis = speed_Wayne + 7 [mph] (ii) use (i) in (ii) => [...] speed_Dennis = 28 mph speed_Wayne = 21 mph
George
Let W be Wayne's speed in miles per hour and D be Dennis's speed in miles per hour. We know that W + 7 = D and W * 2 = D * 1.5. Substituting the first equation into the second: W * 2 = (W + 7) * 1.5 W * 2 = W * 1.5 + 7 * 1.5 0.5 * W = 7 * 1.5 W = 7 * 3 or 21 W is 21 D = W + 7 D = 21 + 7 D = 28
Salma
Devon is 32 32​​ years older than his son, Milan. The sum of both their ages is 54 54​. Using the variables d d​ and m m​ to represent the ages of Devon and Milan, respectively, write a system of equations to describe this situation. Enter the equations below, separated by a comma.
Aaron Reply
find product (-6m+6) ( 3m²+4m-3)
SIMRAN Reply
-42m²+60m-18
Salma
what is the solution
bill
how did you arrive at this answer?
bill
-24m+3+3mÁ^2
Susan
i really want to learn
Amira
I only got 42 the rest i don't know how to solve it. Please i need help from anyone to help me improve my solving mathematics please
Amira
Hw did u arrive to this answer.
Aphelele
hi
Bajemah
-6m(3mA²+4m-3)+6(3mA²+4m-3) =-18m²A²-24m²+18m+18mA²+24m-18 Rearrange like items -18m²A²-24m²+42m+18A²-18
Salma
complete the table of valuesfor each given equatio then graph. 1.x+2y=3
Jovelyn Reply
x=3-2y
Salma
y=x+3/2
Salma
Hi
Enock
given that (7x-5):(2+4x)=8:7find the value of x
Nandala
3x-12y=18
Kelvin
please why isn't that the 0is in ten thousand place
Grace Reply
please why is it that the 0is in the place of ten thousand
Grace
Send the example to me here and let me see
Stephen
A meditation garden is in the shape of a right triangle, with one leg 7 feet. The length of the hypotenuse is one more than the length of one of the other legs. Find the lengths of the hypotenuse and the other leg
Marry Reply
how far
Abubakar
cool u
Enock
state in which quadrant or on which axis each of the following angles given measure. in standard position would lie 89°
Abegail Reply
hello
BenJay
hi
Method
I am eliacin, I need your help in maths
Rood
how can I help
Sir
hmm can we speak here?
Amoon
however, may I ask you some questions about Algarba?
Amoon
hi
Enock
what the last part of the problem mean?
Roger
The Jones family took a 15 mile canoe ride down the Indian River in three hours. After lunch, the return trip back up the river took five hours. Find the rate, in mph, of the canoe in still water and the rate of the current.
cameron Reply
Shakir works at a computer store. His weekly pay will be either a fixed amount, $925, or $500 plus 12% of his total sales. How much should his total sales be for his variable pay option to exceed the fixed amount of $925.
mahnoor Reply
I'm guessing, but it's somewhere around $4335.00 I think
Lewis
12% of sales will need to exceed 925 - 500, or 425 to exceed fixed amount option. What amount of sales does that equal? 425 ÷ (12÷100) = 3541.67. So the answer is sales greater than 3541.67. Check: Sales = 3542 Commission 12%=425.04 Pay = 500 + 425.04 = 925.04. 925.04 > 925.00
Munster
difference between rational and irrational numbers
Arundhati Reply
When traveling to Great Britain, Bethany exchanged $602 US dollars into £515 British pounds. How many pounds did she receive for each US dollar?
Jakoiya Reply
how to reduced echelon form
Solomon Reply
Jazmine trained for 3 hours on Saturday. She ran 8 miles and then biked 24 miles. Her biking speed is 4 mph faster than her running speed. What is her running speed?
Zack Reply
d=r×t the equation would be 8/r+24/r+4=3 worked out
Sheirtina
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Source:  OpenStax, Natuurwetenskappe graad 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11078/1.1
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