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Why putting stoppers in the test tube be dangerous?
If the tube being heated does contain something, then the heating process could cause a change of state of that material in an explosive manner
Is heating of ammonium chloride in a test tube a physical or chemical change?
This is a chemical change (thermal decomposition).
Would cysteine test positive in a biuret test?
no! no change in colour confirms presence of cysteine
Why did glucose test strip change colour after saliva was added?
chemical reaction
Why is the test tube moved back and forth when heating liquids?
so that, it won't be heat automatically that may cause hazard.
Why does colour change after 5 minutes of heating during Benedict's test?
Heating is necessary to transform sugars in enediols which react with Cu(2+).
How do you test purity of khoya?
test for starch- dissolving in water+heating+cooling+3-4 drops of tincture iodine, if present, dark blue colour will appear. test for colour- dissolving in water + HCL ,if metanil yellow colour is present, pink colour will appear.
What color is a postitive protein test?
The colour would change to a purple, dark purple colour.
Is heating red lead in a test tube a chemical change?
Just heating it is a physical change, but the heat soon produces a decomposition, which is a chemical change.2Pb3O4 --> 6PbO + O2
Why putting stoppers in the test tube be dangerous?
If the tube being heated does contain something, then the heating process could cause a change of state of that material in an explosive manner
Is heating of ammonium chloride in a test tube a physical or chemical change?
This is a chemical change (thermal decomposition).
Would cysteine test positive in a biuret test?
no! no change in colour confirms presence of cysteine
Why did glucose test strip change colour after saliva was added?
chemical reaction
What is the test for non reducing sugar?
Benidicts Solution, Wont change colour
What is the test for non-reducing sugars?
Benidicts Solution, Wont change colour
What is the comformation test for morganella morganii?
Urease Test will be positive. You will see a colour change from the broths original colour (usually a light yellow) to a bright pink after being inoculated and incubated for 24 hours.
Why is the test tube moved back and forth when heating liquids?
so that, it won't be heat automatically that may cause hazard.
