Identification of Exothermic and Endothermic Dissolution of Salts - Chemistry Practical

Identification of the dissolution of the given salt whether it is exothermic or endothermic

Tags: Chemistry Laboratory Practical Experiment, 10th Science : Chemistry Practicals

Content Type: Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail

Aim:

To test the dissolution of given salt is exothermic or endothermic.

Principle:

If the reaction or process liberates the heat, then it is called exothermic.

If the reaction or process absorbs the heat, then it is called endothermic.

Apparatus required:

Two beakers, Thermometer, stirrer, weighed amount of two samples.

Procedure:

Take 50ml of water in two beakers and label them as A and B. Note the temperature of the water from beaker A and B. Then, add 5g of sample A into the beaker A and stir well until it dissolve completely. Record final temperature of the solution. Now, repeat the same for the sample B. Record the observation.

Observation:

Result:

From the inferences made

The dissolution of sample A is ____________________(Exothermic or endothermic)

The dissolution of sample B is ____________________(Exothermic or endothermic)

Note:

Sodium hydroxide, ammonium nitrate, glucose, calcium oxide etc. may be given as the sample.

To Study Mendel's Law of Dominance: 10th Science Bio-Botany Practical

To Study the Law of Dominance - Bio-Botany Laboratory Practical Experiment

TO STUDY THE LAW OF DOMINANCE

Aim:

To study the law of dominance by using model / picture / photograph. To find out the genotypic ratio and phenotypic ratio in pea plant using checker board

Procedure:

Depict parental generation and the gametes using colour chalk pieces

Result:

• Phenotypic ratio 3:1
• Genotypic ratio 1:2:1

Explanation:

Inheritance of only one pair of contrasting character is called monohybrid cross. A cross between two forms of a single trait like a cross between tall and dwarf pea plant.

Observation of Transverse Section of Dicot Stem and Dicot Root: A Bio-Botany Lab Practical Guide

Observation of Transverse Section of Dicot stem and Dicot Root - Bio-Botany Laboratory Practical Experiment

Aim:

To observe transverse section (T.S) of Dicot Stem and Dicot Root from permanent slides.

Observation:

The given slide is identified as T.S of Dicot Stem

T.S of Dicot Stem

1. Vascular bundles are arranged in a ring.
2. Conjoint, collateral, endarch and open vascular bundle.
3. Ground tissue differentiated into cortex, endodermis, pericycle and pith.
4. 3 to 6 layer of collenchymas tissues present in hypodermis.

B. The given slide is identified as T.S of Dicot Root

T.S of Dicot Root

1. Radial vascular bundle.
2. 2 to 4 xylem present
3. Cambium present
4. Cortex is made up of parenchymatous cells

Identification of L.S. of the Human Brain: Bio-Zoology Practical Experiment

Identification of L.S of the human brain - Bio-Zoology Laboratory Practical Experiment

Aim:

To observe and draw a labelled sketch of L.S of human brain and indicate the different regions of the brain

Materials Required

Model showing the L.S of human brain

Identification:

The given model is identified as L.S. of human brain

1. The brain is enclosed in the cranial cavity

2. It is the controlling centre of all the body activities.

3. It is covered by three connective tissue membrane or meninges: Duramater Arachnoid membrane and Piamater

4. The human brain is divided into three parts namely forebrain, midbrain and hindbrain

Identification of Endocrine Glands: 10th Science Bio-Zoology Practical

Identification of Endocrine Glands - Bio-Zoology Laboratory Practical Experiment

Aim:

To identify the endocrine gland, its location, hormone secreted and functions - Thyroid gland and Pancreas

Materials Required:

Endocrine glands – (a) Thyroid gland (b) Pancreas – Islets of Langerhans

Any one endocrine gland should be flag labelled.

For the purpose of flag labelling a model / a chart / photograph showing all endocrine glands should be used. (Mark the endocrine glands mentioned for the practical)

Identification:

Identify the flagged endocrine gland, write its location, the hormones secreted and its functions.

(a) Thyroid gland

Identification: The flag labelled endocrine gland is identified as Thyroid gland

Location: Thyroid gland is a bilobed gland located in the neck region on either side of the trachea.

Hormones secreted: Triiodothyronine (T3) and Thyroxine (T4)

Functions of Hormones:

1. Thyroid hormones increases the basal metabolic rate (BMR).
2. It increases the body temperature.
3. It regulates metabolism
4. It is required for normal growth and development
5. It is also known as personality hormone.
6. Deficiency of thyroxine results in simple goiter, myxoedema (in adults) and cretinism (in children).
7. Excess secretion causes Grave’s diseases.

(b) Pancreas – Islets of Langerhans

Identification:

The flag labelled endocrine gland is identified as Islets of Langerhans in the Pancreas.

Location:

Islets of Langerhans are seen embedded in the pancreas which is located in the abdominal region.

Hormones secreted:

1. α cells secrete glucagon
2. β cells secrete insulin

Functions of Hormones:

1. Insulin converts glucose into glycogen and stores it in liver and muscles.
2. Glucagon converts glycogen into glucose.
3. Insulin and glucagon maintain the blood sugar level (80 – 120 mg/dl) by their antagonistic function.
4. Decrease in insulin secretion causes diabetes mellitus.

``