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AQA Science B Unit 2 > 2.2 > Flashcards

Flashcards in 2.2 Deck (15):
1

the body functions properly due to what?

a series of complex chemical reactions

2

acids are neutralised by what?

reaction with oxides,hydroxides or carbonates to form salts and other products

3

how hydrochloride acid is neutralised by sodium hydroxide

HCI + NaOH ---> H2O + CaCI + O2
hydrochloric acid + sodium hydroxide ----> water + sodium chloride

4

if acid is reacted with a carbonate,what is also produced?

carbon dioxide

5

hydrogen ions (H+) make solutions what?

acidic

6

hydroxide ions (OH-) make solutions what?

alkaline

7

neautralisation reaction: an acid and an alkaline substance reacting to form a salt and water equation:

H+(aq) + OH-(aq)--->H2O(L)

8

the stomach works most effectively in what conditions?

acid by helping to break down food

9

how does an antacid neautralise excess stomach acid to help treat heartburn/nausea

like acids, alkalis split up when dissolved in water.
they release hydroxide ions (OH-)

10

sodium hydroxide: alkali

NaOH---> Na+ + OH-
sodium hydroxide ---> sodium ion + hydroxide ion

11

we use alkalis like ____ and ____ in antacids (weak bases) to do what?

hydroxide AI(OH)3
and magnesium hydroxide Mg(OH)2 to treat stomach acid

12

what does the hydrochloric acid do in stomach

helps enzymes break down the protein that we eat
helps us protect from microbes in our food

13

what does excess acid do

make us feel uncomfortable
heartburn and nausea

14

what do pharmacologists -antacids do?

test the effectiveness of antacids in terms of how efficiently they neutralise excess stomach acid before they are sold to consumer

15

what does our stomach contain?

hydrochloric acid
•helps enzymes to break down the protein that we eat
•helps to protect us from infection from microbes in our food