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- Question
What are the two types of pure substances?
- Correct Answer
- An atom is the smallest particle of a substance Chemical substances are divided into two major groups They are 1 Pure Substances (and) 2 Mixtures There are two types of pure substances that are Elements and Compounds Elements : An element is a substance that is made up of only one kind of atoms and cannot be broken down into simpler substances by chemical means Metals and Non- metals come under elements Examples of elements are Iron, Silver, Gold, Mercury etc Compounds : A Compound is a substance that is formed when two or more elements combine chemically Examples of compounds are Water, Carbon dioxide, methane, vinegar etc Mixtures : A Mixture is formed when two or more substances mixed together but not chemically combined Example: Air
- 1. Is boiling water a chemical change? Discuss
- 2. Glass is a.........mixture of metallic...........
Options- A. homogenous, sulphates
- B. homogenous, silicates
- C. heterogenous, carbonates
- D. heterogenous, nitrates Discuss
- 3. Metal present in chocolate wrappers is
Options- A. Aluminium
- B. Haemoglobin
- C. Chalk
- D. Chlorophyll Discuss
- 4. When the nucleus of Uranium is bombarded with neutrons, it breaks up into two nuclei of nearly equal mass. this process is called
Options- A. nuclear fission
- B. nuclear fusion
- C. physical change
- D. artificial radioactivity Discuss
- 5. Which of the following is an element
Options- A. alumina
- B. brass
- C. graphite
- D. silicon Discuss
- 6. What element is found in all organic compounds?
Options- A. Hydrogen
- B. Calcium
- C. Nitrogen
- D. Carbon Discuss
- 7. What type of Lipid is Estrogen?
Options- A. phospholipid
- B. steroid
- C. wax
- D. triglyceride Discuss
- 8. What is the freezing point of water in Celsius?
Options- A. 0 deg C
- B. 32 deg C
- C. -42 deg C
- D. -32 deg C Discuss
- 9. The structure of IF7 is
Options- A. Pentagonal bipyramid
- B. Square pyramid
- C. Trigonal bipyramid
- D. Octahedral Discuss
- 10. Lime is sometimes applied to soil in order to
Options- A. increase the acidity of the soil
- B. make the soil more porous
- C. restore nitrates to the soil
- D. increase the alkalinity of the soil Discuss
Chemistry problems
Search Results
Correct Answer: No Boiling water is not a chemical change Because in this process it doesn't loss its properties It just changes its state ie, from liquid state to gaseous Hence, Boiling water is a Physiacl change and not a chemical change
Correct Answer: homogenous, silicates
Correct Answer: Aluminium
Correct Answer: nuclear fission
Correct Answer: silicon
Correct Answer: Carbon
Explanation:
Carbon is found in all organic compounds.
Correct Answer: steroid
Explanation:
Estrogen is a group of steroid hormone that control the development and maintenance of an individuals feminine characteristics. Natural estrogen exists in men as well as women and are found in higher amounts in women Especially in those of reproductive age.
Estrogens are hormones which are responsible to the body functions of the female body system such as menstruation, development of the female body such as pubic hair, breasts and development of the proportions of the body.
Lipids act as best energy storage molecules as the cleavage of fatty acids produces both energy and metabolic water which is a main component in almost all lipids.
Correct Answer: 0 deg C
Explanation:
The freezing point of water and melting point is 0 °C or 32 °F. The temperature may be lower if supercooling occurs.
Correct Answer: Pentagonal bipyramid
Explanation:
Hybridisation of iodine is
So, the structure is pentagonal bipyramid.
Correct Answer: increase the alkalinity of the soil
Explanation:
Lime is sometimes applied to soil in order to increase the acidity of the soil.
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