zname kovy

Question 1

na co delime kovy?

Answer 1

uslechtile a neuslechtile

Question 2

co je to med?

Answer 2

cervenohnedy kujny a tazny

Question 2

jak se kovy rozdeluji do techto skupin?

Answer 2

uslechtile-ryzi forma, neuslechtile-slouceniny

Question 2

¨cim se pokryva med?

Answer 2

zelenou vrstvu oxidu proti korozi

Question 2

co vede med?

Answer 2

elektricky proud a teplo

Question 3

na co se vyuziva med?

Answer 3

okapy,elektrovodice,draty

Question 4

co je to stribro?

Answer 4

sedy,leskly,mekky kov, casem ve vzduchu cerna

Question 5

co vodi stribro?

Answer 5

elektricky prou

Question 6

vyuziti stribra?

Answer 6

sperky,zrcadla,nadobi

Question 7

co je to cin?

Answer 7

stribroleskly snadno tavitelny kov

Question 8

na co se vyuziva/vyuzival cin?

Answer 8

ochranny povlak na kovove predmety, nadobi a hracky

Question 9

slitina cinu?

Answer 9

bronz,pajka

Question 10

co je to rtut?

Answer 10

jediny kapalny kov,stribroleskly,velka hustota, jedovaty

Question 11

na co se pouziva rtut?

Answer 11

do teplomeru,vybojek, polarografickych pristroju

Question 12

rtut s praskovym stribrem?

Answer 12

amalgám-zubar

Question 13

co je to zelezo?

Answer 13

stribroleskly,pevny,magneticky,tazny a kujny kov

Question 14

co znehodnocuje zelezo?

Answer 14

vzdusna vlhkost-koroze

Question 15

jak se vyrabi zelezo?

Answer 15

ve vysoke peci-tvrdy a krehky

Question 16

jak se zpracovava zelezo?

Answer 16

slitiny-pruzna a kujna

Question 17

co je to zinek?

Answer 17

sedobily snadno tavitelny kov

Question 18

na co se pouziva zinek?

Answer 18

povrchova ochrana plechu proti korozi,baterie,mnohoclanky a nadob

Question 19

dulzita slitina zinku?

Answer 19

mosaz-vyroba nastroju

Question 20

co je to zlato?

Answer 20

zluty,mekky,leskly kov s velkou hustotou a elek. vodivosti

Question 21

proti cemu je odolne zlato?

Answer 21

kyselinam

Question 22

co se vyrabi ze zlata?

Answer 22

sperky,medaile,a zdobi se jim sklo

Question 23

co je to olovo?

Answer 23

sedobily, mekky snadno tavitelny,jedovaty kov s velkou hustotou

Question 24

co pohlcuje olovo?

Answer 24

radioaktivni a rentgenove zareni

Question 25

co je to hlinik?

Answer 25

stribroleskly,kujny,tazny,lehky, a pevny kov-nepodleha korozi

Question 25

na co se pouziva olovo?

Answer 25

autobaterie,streliva,soucast barev

Question 26

na co se vyuziva hlinik?

Answer 26

alobal,plechovky, odlehcenych konstrukc

Question 27

znnama slitina hliniku?

Answer 27

dural-sportovni potreby