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- Question
Is water a Pure substance?
Options- A. TRUE
- B. FALSE
- Correct Answer
- TRUE
ExplanationTrue, Water is a Pure substance and not a mixture.
We know that, A mixture is when two or more substances combine physically together. You can find that the mixture retains the properties of the original components.
In water, two hydrogen atoms combine with one oxygen atom chemically, forming a new substance that has properties different from hydrogen alone or oxygen alone.
Therefore, water is not a mixture; it is a compound and it is pure.
- 1. Which of the following is a Decomposition Reaction?
Options- A. 2HgO ----> 2Hg + O2
- B. 6NaNO3 ----> 6NaNO2 + 3O2
- C. ZnCO3 ----> ZnO + CO2
- D. All the above Discuss
- 2. Li3PO4 compound name?
Options- A. Lithium perchlorate
- B. Lithium phyrite
- C. Lithium phosphate
- D. None Discuss
- 3. What is the systematic name of NH4ClO3 ?
Options- A. Ammonium Chloride
- B. Ammonium Chlorate
- C. Ammonium Chlorane
- D. Ammonium Chlorine Discuss
- 4. What is the systematic name of Mg(NO3)2?
Options- A. Manganese nitrite
- B. Magnesium nitrite
- C. Magnesium nitrate
- D. Manganese nitrate Discuss
- 5. What state of matter is Jello?
Options- A. Liquid
- B. Solid
- C. Colloid
- D. Gas Discuss
- 6. Which of the following is not a pure substance?
Options- A. Oxygen
- B. Carbon dioxide
- C. Water
- D. Milk Discuss
- 7. Is Nitrogen an Inert gas?
Options- A. TRUE
- B. FALSE Discuss
- 8. How many valence electrons are in carbon?
Options- A. 2
- B. 4
- C. 6
- D. 3 Discuss
- 9. What is a Solution and what are the two parts of a solution? Discuss
- 10. The oldest known organic compound is
Options- A. Urea
- B. Methane
- C. Acetic acid
- D. Benzene Discuss
Chemistry problems
Search Results
Correct Answer: All the above
Explanation:
All the given reactions are Decomposition reactions.
Decomposition reaction is a reaction in which only one reactant is splitted into two or more products.
Correct Answer: Lithium phosphate
Explanation:
The given compund name is Lithium phosphate.
Lithium phosphate is a white crystal at room temperature. It is slightly soluble in water.
It can be used to produce glass, disk, colorful phosphor powder. It can also be used as a catalyst in some reactions.
Correct Answer: Ammonium Chlorate
Explanation:
In common we all call the systematic name of as Ammonium Chlorate. But originally the systematic name is azanium trioxidochlorate.
Correct Answer: Magnesium nitrate
Explanation:
Mg(NO3)2 is Magnesium nitrate.
In the case of Mg(NO3)2, the metal in the compound is magnesium (Mg), and the non-metal here is called the nitrate ion (NO3). This makes the name of the compound simply magnesium nitrate.
Correct Answer: Colloid
Explanation:
Jello is a colloid, a semi-rigid structure i.e, semi-solid suspended in a liquid. When you Heat it up a bit and you'll break the protein bonds of the gelatin and it will liquefy completely and if you freeze, it becomes solid.
Correct Answer: Milk
Explanation:
Milk is not a pure substance since it has so many constituents that can be separated physically.
Compounds are pure substances formed from elements unlike mixtures.
Correct Answer: FALSE
Explanation:
Nitrogen is found as a diatomic molecule (N2) in nature. There is a triple bond between the two nitrogen atoms.
The triple bond is pretty strong. Therefore, it needs a lot of energy to break those bonds and participate in a reaction. So nitrogen is commonly referred to as and used as an inert gas (high abundance & low cost.) However, it?s not truly inert like most noble gases. Nitrogen does react if the conditions are met. But those conditions are not exactly mild, but are not as extreme as for noble gases.
It forms nitric oxide and nitrogen dioxide with oxygen, ammonia with hydrogen, and nitrogen sulfide with sulfur.
Correct Answer: 4
Explanation:
The main group number for an element can be found from its column on the periodic table. For example, carbon is in group 4 and has 4 valence electrons. Oxygen is in group 6 and has 6 valence electrons.
Correct Answer: A solution is a homogeneous type of mixture of two or more substances A solution has two parts:: 1 A solute and 2 A solvent The solute is the substance that dissolves, and the solvent is the majority of the solution
Correct Answer: Acetic acid
Explanation:
In the form of vinegar, acetic acid is known from very early times. It is got by oxidation of fermented liquors (10-15%, alcohol) by air under the influence of a bacteria called 'mycoderma acetic'
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