MCQ 28: The cooling pack which treat a sports injury is kneaded with water and A. Ammonium chloride crystals B. calcium chloride crystals C. Ammonium dioxide crystals D. nitrogen

Q: MCQ 103: Concrete sets when arranged with iron rods passes through it, improves A. strength B. style…

A: The question is based on concept of general chemistry. we need to indicate the importance of passing…

Q: 33. The compound above would NOT be soluble in a. water b. hexane C. nonpolar solvents d. more than…

A: This is a part of solution chemistry which is explained below.

Q: FeClz is highly corrosive and is irritating to skin and eyes. Which waste container should sol…

A: FeCl3 is a highly corrosive. FeCl3 is very acidic and we used basic container to put in.

Q: Bergamot mint essential oil is extracted from: Choose one answer. a. orange rind b. flower petals c.…

A:

Q: What is the most common filter paper used in the laboratory? A. Cellulose fiber filter B. Glass…

A: Given: Three types of filter paper Cellulose fiber filter Glass fiber filter Membrane filter To…

Q: What substance was used to separate the salt from the sand? Group of answer choices A. Oil B. Heat…

A: Separating a mixture of two we have to consider their physical properties.

Q: Why are icebergs, despite being made of frozen seawater, not salty? A. the crystallizing water traps…

A: "The correct answer and explaination is given in below steps"

Q: Which statement best describes dry deposition? A Acidic gases are repelled by the surfaces of both…

A: The presence of substances in the atmosphere that causes harmful effects on humans and other leaving…

Q: Which one of the following is not an organic pollutant: 1. a. Chloroform b. Benzene c. Cobalt…

A: On the basis of types of compounds these are divided into two pats as ; Organic compounds :-  The…

Q: one of the following is primary standard for iodine O a. potassium hydrogen phthalate b. sodium…

A: Standardization is the process of determining the exact concentration of the solution. Primary…

Q: An antimicrobial agent preservative that inhibits the growth of molds, yeast and bacteria in food.…

A: Food preservatives are the substances which are added to food items in order to preserve them for a…

Q: Organic solids are best purified by a. recrystallization b. vacuum distillation c. fractional…

A: Purification of organic compounds can be done by various methods namely distillation method,…

Q: Which of the following is not a first aid measure for nitric acid? Select one: a. If in contact…

A:

Q: A chemical described as having a local effects causes damage that is: a. widespread     b. where…

A: A chemical may be harmful or be useful for a particular action in the body. There are many different…

Q: What common result occurred in all of the following experimental tubes? Why?  a. a mixture of hot…

A:

Q: The balance of water in the body takes into account the intake of food, liquids and: a. the hydrogen…

A: Correct option is c. That is metabolic reactions.  Incorrect option are: a. the hydrogen bridges…

Q: What gas produces the eyes characteristic of Swiss cheese? Choose one:   O A. CO2 O B. 02 O C.…

A: The size and number of eyes in Swiss cheese are influenced by various factors, including the type of…

Q: Increasing the number of carbons in a drug molecule (more than five carbon atoms) will: O a.…

A: Given information,     The number of carbon atoms in a drug molecule is increased

Q: MCQ 31: The ions which do not take part in any activity step during a chemical reaction are called…

A: Ions are the chemical species which possess a negative or positive charge over them. The ions…

Q: 4. Which of the following describes surface tension in water? A. surface tension occurs due to ionic…

A: 4. Surface tension allows water to support small objects if they are placed carefully on its…

Q: 9. Boiling stones are added to the liquid to: a. accelerate purifying. b. catching impurities. c.…

A: Given Boiling stones are added to the liquid

Q: Why is water important for a cell ? 1. Water is the main ingredient in DNA 2.All proteins are made…

A: Answer

Q: The most common chemical route of entry is: a. ingestion b. inhalation c. skin / eye contact d.…

A: The most common chemical route of entry is: Answer : b. inhalation

Q: Essential oils have been used in cough medicines for the treatment of bronchitis for many years. The…

A: Essential oils have wide varieties of applications in treating infections and used as fragrance…

Q: The murexid test is used to confirm the authenticity: A. Caffeine B. Metamizole sodium C.…

A: The murexide test is used to confirm the authenticity ?

Q: MCQ 104: When calcium oxide is burned with clay its makes A. cement B. steel C. calcium carbonate D.…

A: Cement is formed when calcium oxide is burned with Clay .  clay( SiO2)  is used as a binder.

Q: Main cause why pollutants end up at fish meat:  a. burning fossil fuels b. air pollution c. water…

A: Samples of various fishes when tested it was found that they are contaminated with high level of…

Q: Why is a salt solution used in the preparation of soap

A: In this question we have to write the explanation why salt added in the solution during the…

Q: Which intermolecular force requires a polar molecule? A. dispersion forces  B. covalent bonding…

A: Interpretation: Which kind of intermolecular force requires a polar molecule is to be determined.…

Q: What chemical reaction happens when dye is exposed to air?

A: The coloured compounds that are chemically bound to the substrates and induce visually detectable…

Q: What is the chemical reaction of copper wire is left in:   a. distilled water b. water with…

A: Given that : We have to write the chemical reaction of copper wire left in : a. distilled water b.…

Q: Standard solution used in nonaqueous alkalimetry: a. hydrogen bromide b. sodium hydroxide c.…

A:

Q: What can we use hard water for?

A: USES OF HARD WATER Uses of hard water is given as following : 1. Hard water contains extra minerals…

Q: 3. The drug is soluble in a solution of ammonia and sodium hydroxide: A. Caffeine B. Theophylline…

A: Please find your solution below : Drugs are the chemical compounds that change the way of working of…

Q: A parent witnessed his child who just ingested an old silvery coin. This is an emergency because…

A: Silver is non-toxic and one of the precious metals with the symbol Ag and it is used to make…

Q: 2. The method for the quantitative determination of the substance metamizole sodium (analgin),…

A: The process of determining the quantity of a sample by adding measured increments of a titrant until…

Q: These modify the interfacial properties of substances. A. Surfactants B. Aerosols C. Nanotechnology…

A: Answer is A) Surfactants

Q: 1. A manufacturing company is interested in knowing how much protein is present in their new protein…

A: Qualitative analysis helps in determining the presence or absence of certain elements, ions,…

Q: What is the reaction of gelatin to concentrated HCl?

A:

Q: How do you explain the presence of contaminates in mountain water?

A: Contamination is the presence of a constituent, impurity, or some other undesirable element that…

Q: What is the purpose of the ion exchange resin? a. The ion exchange resin takes out Ca2+ and gets…

A: Ion resins are used for softening water.

Q: If a sample of Distilled and alkalinized water is exposed to red litmus paper, it will turn the…

A: Distilled water has the neutral pH of 7 while alkalinized water has the pH of 8-9. The mixture of…

States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates). 

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.