plz help on a dot point

Sirius Black · 2 Feb 2005, 11:26 PM

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"explain the use of acids as food additives."
It is very easy to identify their use which is to preserve food by extinguishing microbes but how to "explain their uses"?

thanx

tennille · 3 Feb 2005, 8:32 AM

explain means how and why. How are they used? (I wouldn't have a clue- they are just added on the food hence the name additives?). Why are they used? To stop the action of microbes which result in the deterioration of food. Acidic environments are undesirable for microbes and therefore preserve the food. Acids also produce a sharp taste making it more acceptable to the consumer. Citric acid also acts as an antioxidant, preventing the oxidation of food and therfore preserving it.

04er · 10 Feb 2005, 7:32 PM

I remember that Cambridge Chemistry Study Guide answers this dot point most thoroughly.

velox · 11 Feb 2005, 8:26 PM

cambridge or macquarie? I haven't come across cambridge

fantasy27 · 12 Feb 2005, 10:54 AM

i heard macq does it pretty good too, i donno about cambridge though.. i haven't seen the cambridge one for chem, i only seen it for 3u maths i think its blue

04er · 12 Feb 2005, 11:07 AM

Quote:

Originally Posted by wrx

cambridge or macquarie? I haven't come across cambridge

See Cambridge HSC Study Guide

fantasy27 · 13 Feb 2005, 10:02 AM

with the cambridge study guide, does it like have the dot point then answer it underneath or issit just like a studyguide, and isnt that obvious...

because i make my own study notes under the dot points, but sometimes i get really stuck on one dot point, and can't find it in anything.. hmm

theChemCoach · 16 Feb 2005, 2:35 AM

Quote:

Originally Posted by Sirius Black

"explain the use of acids as food additives."
It is very easy to identify their use which is to preserve food by extinguishing microbes but how to "explain their uses"?

thanx

Here are a few good reasons for acid as food additives.

They can be used to:

1). Improve the taste or appearance of a processed food.
Acids & Acidity regulators help to maintain a constant acid level in food. This is important for taste, as well as to influence how other substances in the food function. For example, an acidified food can retard the growth of some micro-organisms
Acidity regulator (270) - lactic acid
Acidity regulator (260) - acetic acid, glacial

2). Improve the keeping quality or stability of a food.

3). Preserve food when this is the most practical way of extending its storage life. For example, sulphur dioxide - preservative (220) - is added to some meat products such as sausage meat to prevent microbial growth.
(this is usually the most emphasised point, and SO(2) is a great example to learn)

All information comes from FSANZ (Food Standards of Australia & New Zealand).

Best of Luck in your HSC,
George

04er · 18 Feb 2005, 11:15 AM

Quote:

Originally Posted by fantasy27

with the cambridge study guide, does it like have the dot point then answer it underneath or issit just like a studyguide, and isnt that obvious...

because i make my own study notes under the dot points, but sometimes i get really stuck on one dot point, and can't find it in anything.. hmm

It is 'just like a study guide', but it is easy to find information for the dot points that it covers

fantasy27 · 18 Feb 2005, 4:33 PM

oh okay, thankyou very muchi!!

04er · 18 Feb 2005, 6:16 PM

Quote:

Originally Posted by fantasy27

oh okay, thankyou very muchi!!

No problem

song · 2 Mar 2005, 9:57 AM

sulfur dioxide: used in wine to kill microbes
and to add flavour

Proponionic acid: in bread to prevent mould

Trev · 2 Mar 2005, 3:55 PM

Useless fact, they use sulfur dioxide to preserve vegemite. (Well that's what I heard today!)

xrtzx · 2 Mar 2005, 8:27 PM

heres what i got

Citric & tartaric acids are often added to jam to give a sharp taste. There acidity also prevents the growth of microorganisms
Acetic acid in vinegar heaps preserve chutneys
Acidic sulfur dioxide is used in dried fruit and white wine to stop attacks from microbes.
Ascorbic acid is an antioxidation thus is added to food to prevent spoilage by oxidation.

mainly food additives help preserve food due to the short life of it.

xrtzx · 2 Mar 2005, 8:29 PM

i guess that really doesnt answer how they do it, but i dont think you need to know that

2 Feb 2005, 11:26 PM	#1 (permalink)
Sirius Black Maths is beautiful HSC: 2005 Gender: Female Location: some where down the south Join Date: Mar 2004 Posts: 286 Last Activity: 28 Oct 2009, 12:03 PM	plz help on a dot point You can hide this advertisement by registering. "explain the use of acids as food additives." It is very easy to identify their use which is to preserve food by extinguishing microbes but how to "explain their uses"? thanx

10 Feb 2005, 7:32 PM	#3 (permalink)
04er ... HSC: 2004 Gender: Male Location: Sydney Join Date: Jan 2004 Posts: 921 Last Activity: Today, 11:06 AM	I remember that Cambridge Chemistry Study Guide answers this dot point most thoroughly. __________________ Law/Commerce (Finance) IV @ USyd

2 Mar 2005, 3:55 PM	#13 (permalink)
Trev stix HSC: 2005 Gender: Male Location: Pine Palace, St. Lucia, Brisbane. Join Date: Jun 2004 Posts: 2,047 Last Activity: Today, 12:47 AM	Useless fact, they use sulfur dioxide to preserve vegemite. (Well that's what I heard today!) __________________ myspace.com/daylight_robbery__

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3 Feb 2005, 8:32 AM	#2 (permalink)
tennille ... HSC: 2004 Gender: Female Location: Sydney Join Date: Nov 2003 Posts: 3,487 Last Activity: 29 Jun 2009, 5:10 PM	explain means how and why. How are they used? (I wouldn't have a clue- they are just added on the food hence the name additives?). Why are they used? To stop the action of microbes which result in the deterioration of food. Acidic environments are undesirable for microbes and therefore preserve the food. Acids also produce a sharp taste making it more acceptable to the consumer. Citric acid also acts as an antioxidant, preventing the oxidation of food and therfore preserving it.

11 Feb 2005, 8:26 PM	#4 (permalink)
velox Retired HSC: N/A Gender: Male Location: Where the citi never sleeps. Join Date: Mar 2004 Posts: 5,425 Last Activity: Yesterday, 8:55 PM	cambridge or macquarie? I haven't come across cambridge

12 Feb 2005, 10:54 AM	#5 (permalink)
fantasy27 Executive Member HSC: N/A Gender: Undisclosed Join Date: Feb 2004 Posts: 529 Last Activity: 20 Nov 2009, 5:59 PM	i heard macq does it pretty good too, i donno about cambridge though.. i haven't seen the cambridge one for chem, i only seen it for 3u maths i think its blue

13 Feb 2005, 10:02 AM	#7 (permalink)
fantasy27 Executive Member HSC: N/A Gender: Undisclosed Join Date: Feb 2004 Posts: 529 Last Activity: 20 Nov 2009, 5:59 PM	with the cambridge study guide, does it like have the dot point then answer it underneath or issit just like a studyguide, and isnt that obvious... because i make my own study notes under the dot points, but sometimes i get really stuck on one dot point, and can't find it in anything.. hmm

18 Feb 2005, 4:33 PM	#10 (permalink)
fantasy27 Executive Member HSC: N/A Gender: Undisclosed Join Date: Feb 2004 Posts: 529 Last Activity: 20 Nov 2009, 5:59 PM	oh okay, thankyou very muchi!!

2 Mar 2005, 9:57 AM	#12 (permalink)
song Junior Member HSC: 2006 Gender: Female Join Date: Sep 2004 Posts: 26 Last Activity: 11 Jun 2007, 6:11 PM	sulfur dioxide: used in wine to kill microbes and to add flavour Proponionic acid: in bread to prevent mould

2 Mar 2005, 8:27 PM	#14 (permalink)
xrtzx i <3 /\/\0\|)s HSC: 2010 Gender: Undisclosed Location: on ur doorstep Join Date: Oct 2004 Posts: 1,355 Last Activity: 12 Apr 2006, 10:05 PM	heres what i got Citric & tartaric acids are often added to jam to give a sharp taste. There acidity also prevents the growth of microorganisms Acetic acid in vinegar heaps preserve chutneys Acidic sulfur dioxide is used in dried fruit and white wine to stop attacks from microbes. Ascorbic acid is an antioxidation thus is added to food to prevent spoilage by oxidation. mainly food additives help preserve food due to the short life of it.

2 Mar 2005, 8:29 PM	#15 (permalink)
xrtzx i <3 /\/\0\|)s HSC: 2010 Gender: Undisclosed Location: on ur doorstep Join Date: Oct 2004 Posts: 1,355 Last Activity: 12 Apr 2006, 10:05 PM	i guess that really doesnt answer how they do it, but i dont think you need to know that