Bases have a-
bitter taste and a rough feel
sour taste and a rough feel
bitter taste and a soapy feel
sour taste and a soapy feel
An example of a natural indicator is-
methyl orange
ink
phenolphthalein
litmus
55
Answers
Answer:
Explanation:
Which tastes can we sense with our tongues?
How does our sense of taste ensure our survival?
What are the unique properties of:
acids;
bases;
neutral substances?
Which household substances are (or contain):
acids;
bases;
neutral substances?
How can we tell if something is an acid, a base or a neutral substance?
What do you know about acids? Would you touch an acid? Have you ever tasted an acid? Do you think it is possible to taste an acid without burning your tongue? What do you think it would feel like when an acid burned your tongue?
Before we talk more about acids, let us first examine the human tongue. It is a most fascinating organ, and plays an important role in our sense of taste.
Tastes of substances
flavour
sense
taste buds
chemoreceptor
savoury
instinct
tongue map
What is your favourite food? What do you like most about your favourite food? You will probably say that you just LOVE the taste of it! The taste of our favourite foods make us feel good. How do we taste our food?
We taste food with tiny structures on our tongues!
Look in the mirror, and stick out your tongue. Look for small, round bumps. These are called papillae. Most of them contain taste buds. The taste buds are very small structures which have sensitive hairs. The chemicals in the food that you eat dissolve into your saliva in solution. The chemicals then stimulate the tiny hairs within the tastebuds and turn these signals into impulses. These impulses travel to the brain allowing us to experience the sensation of taste.
Insects have the most highly developed sense of taste. They have taste organs on their feet, antennae, and mouthparts.
We have more than 10 000 taste buds in our mouth. You even have taste buds on the roof of your mouth.
HAVE A LOOK AT YOUR OWN TONGUE
MATERIALS:
mirror
pencil
sugar water
lemon juice
INSTRUCTIONS:
Look in the mirror at your tongue.
Stick it out as far you can and try to see the papillae. Are they larger in some areas?
Have you tasted a lemon before?
Close your eyes and imagine biting into a slice of lemon. Can you describe the experience? What does the lemon taste like? Sweet, sour, salty or bitter?
If you have sugar solution and lemon juice available in the class, taste these different substances. See if you can identify where on your tongue you taste the two different tastes.
Your tongue can only sense four flavours
You can only sense four different tastes with your tongue. Can you name them?
The tongue map.
The four main tastes that are most common, are sweet, sour, salt and bitter. These tastes combine to make up the different flavours of our foods.