Is a physical change A.Forming a mixture B.Burning wood C.Food turning into waste in the intestines D.Turning solid sodium and chlorine gas into salt?

Is a physical change A.Forming a mixture B.Burning wood C.Food turning into waste in the intestines D.Turning solid sodium and chlorine gas into salt?
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Which one of the following is a physical change? (a) Burning of coal (b) Burning of wood (c) Heating of a platinum crucible (d) Heating of potassium chlorate

Description : Which one of the following is a physical change? (a) Burning of coal (b) Burning of wood (c) Heating of a platinum crucible (d) Heating of potassium chlorate

Last Answer : Ans:(c)

Which of the following reactions involve NEITHER oxidation nor reduction? w) burning antimony in chlorine x) decomposition of potassium chlorate y) reaction of sodium with water z) reaction of potassium hydroxide with nitric acid

Description : Which of the following reactions involve NEITHER oxidation nor reduction? w) burning antimony in chlorine x) decomposition of potassium chlorate y) reaction of sodium with water z) reaction of potassium hydroxide with nitric acid

Last Answer : ANSWER: Z -- REACTION OF POTASSIUM HYDROXIDE WITH NITRIC ACID  

The sources of sulphur dioxide may be: 1. burning of coal 2. solid municipality waste disposal 3. burning of diesel 4. volcanoes The correct sources are: (a) 1, 2 and 4 only (b) 1, 3 and 4 only (c) 1, 2, 3 and 4 (d) 1, 2 and 3 only

Description : The sources of sulphur dioxide may be: 1. burning of coal 2. solid municipality waste disposal 3. burning of diesel 4. volcanoes The correct sources are: (a) 1, 2 and 4 only (b) 1, 3 and 4 only (c) 1, 2, 3 and 4 (d) 1, 2 and 3 only

Last Answer : Ans:(b)

Which of the salt in the mineral mixture or food can prevent the subject from goiter D A. Cobalt Chloride B. Sodium Chloride C. Iron Sulphate D. Potassium Iodide

Description : Which of the salt in the mineral mixture or food can prevent the subject from goiter D A. Cobalt Chloride B. Sodium Chloride C. Iron Sulphate D. Potassium Iodide

Last Answer : Potassium Iodide

A mixture of chlorine & sodium bromide acts as a/an (A) Insecticides (B) Analgesic drug (C) Fire retardant (D) Hydrogenation catalyst

Description : A mixture of chlorine & sodium bromide acts as a/an (A) Insecticides (B) Analgesic drug (C) Fire retardant (D) Hydrogenation catalyst

Last Answer : (C) Fire retardant

Why does sodium and chlorine make salt?

Description : Why does sodium and chlorine make salt?

Last Answer : The bond is based on the electrostatic reaction.

How to separate pieces of copper wire from a mixture of wood chips, sand and salt?

Description : How to separate pieces of copper wire from a mixture of wood chips, sand and salt?

Last Answer : Separating Salt and Sand Using Solubility Pour the salt and sand mixture into a pan. Add water. ... Heat the water until the salt dissolves. ... Remove the pan from heat and allow it to cool until it's safe to handle. Pour the salt water into a separate container. Now collect the sand.

(a) Define a balanced chemical equation. Why should an equation be balanced? (b) Write the balanced chemical equation for the following reaction: (i) Phosphorus burns in presence of chlorine to form phosphorus penta chloride. (ii) Burning of natural gas. (iii) The process of respiration. -Chemistry

Description : (a) Define a balanced chemical equation. Why should an equation be balanced? (b) Write the balanced chemical equation for the following reaction: (i) Phosphorus burns in presence of chlorine to form phosphorus penta chloride. (ii) Burning of natural gas. (iii) The process of respiration. -Chemistry

Last Answer : Answer. (a) Balanced chemical equation has an equal number of atoms of different elements in the reactants and products. According to law of conservation of mass, matter can neither be created nor be destroyed in a chemical ... C6H12O6 (s) + 6O2 (g) + 6H2O ---> 6CO2 (aq) + 12H2O (l) + energy

Chlorine free radicals react with methane by : (a) donating their free-radical electron to methane to form chloromethane. (b) abstracting a hydrogen atom from methane, and producing HCl and a methyl radical. (c) forming a carbanion intermediate that rapidly dissociates to produce chloromethane. (d) forming a carbonium ion intermediate that rapidly dissociates to form chloromethane

Description : Chlorine free radicals react with methane by : (a) donating their free-radical electron to methane to form chloromethane. (b) abstracting a hydrogen atom from methane, and producing ... produce chloromethane. (d) forming a carbonium ion intermediate that rapidly dissociates to form chloromethane

Last Answer : abstracting a hydrogen atom from methane, and producing HCl and a methyl radical

Sodium sulphur battery is a type of molten-salt battery constructed from _____ sodium and sulphur. • Solid • Liquid • Plasma • Gases

Description : Sodium sulphur battery is a type of molten-salt battery constructed from _____ sodium and sulphur. • Solid • Liquid • Plasma • Gases

Last Answer : • Liquid

Real wood burning fire or fake gas logs?

Description : Real wood burning fire or fake gas logs?

Last Answer : I have such mixed feelings. I agree that it is not the same. I love the wood burning, but the pollution is pretty bad. In the Pacific Northwest on a cold evening when everyone is using ... air quality is horrible with a smog-like effect and high particulate matter that is very bad for asthmatics.

Is the mass of wood and oxygen that allow it to burn equal the mass of ashes and the gas given off during the burning?

Description : Is the mass of wood and oxygen that allow it to burn equal the mass of ashes and the gas given off during the burning?

Last Answer : Yes. According to the law of conservation of mass, the mass ofall the reactants must be equal to the mass of all of theproducts.

The chlorine supply cylinders are generally kept at 38°C to 40°C to prevent (A) Conversion into crystals (B) It from burning (C) It from explosion (D) None of these

Description : The chlorine supply cylinders are generally kept at 38°C to 40°C to prevent  (A) Conversion into crystals  (B) It from burning  (C) It from explosion  (D) None of these

Last Answer : (A) Conversion into crystals 

Zinc granules on treating with an acid X, form the zinc sulphate (ZnSO4) salt along with the evolution of a gas Y which burns with a pop sound when brought near to a burning candle. Identify the acid X and gas evolved Y (a). X- Sulphuric acid and Y- Oxygen gas (b). X- Hydrochloric acid and Y- Oxygen gas (c). X- Sulphuric acid and Y- Hydrogen gas (d). X- Hydrochloric acid and Y- Hydrogen gas

Description : Zinc granules on treating with an acid X, form the zinc sulphate (ZnSO4) salt along with the evolution of a gas Y which burns with a pop sound when brought near to a burning candle. Identify the acid X and ... (c). X- Sulphuric acid and Y- Hydrogen gas (d). X- Hydrochloric acid and Y- Hydrogen gas

Last Answer : (c). X- Sulphuric acid and Y- Hydrogen gas

What is the reaction when solid manganese dioxide reacts with hydrochloric acid to produce manganese chloride liquid water and chlorine gas?

Description : What is the reaction when solid manganese dioxide reacts with hydrochloric acid to produce manganese chloride liquid water and chlorine gas?

Last Answer : The chemical reaction is:MnO2 + 4 HCl = MnCl2 + Cl2 + 2 H2O

What is the balanced chemical equation for Solid calcium and chlorine gas react to form solid calcium chloride?

Description : What is the balanced chemical equation for Solid calcium and chlorine gas react to form solid calcium chloride?

Last Answer : Need answer

Chlorine gas is produced by the electrolysis of brine (NaCl solution with solid NaCl make up) in mercury electrolytic cell. Which of the following is the anodic reaction? (A) Oxidation of Na + ions (B) Oxidation of Cl - ions (C) Reduction of Na + ions (D) Reduction of Cl - ions

Description : Chlorine gas is produced by the electrolysis of brine (NaCl solution with solid NaCl make up) in mercury electrolytic cell. Which of the following is the anodic reaction? (A) Oxidation of Na + ions (B) Oxidation of Cl - ions (C) Reduction of Na + ions (D) Reduction of Cl - ions

Last Answer : (B) Oxidation of Cl - ions

Which one of the following statements about PYROLYSIS, which is a process for solid waste treatment is incorrect? (1) It converts the waste into solid, liquid and gas of which the resultant liquid and gas can be used to produce energy. (2) The process occurs at a temperature above 430°C at atmospheric pressure. (3) The process occurs under high pressure at temperature above 430° C. (4) It is a thermo chemical decomposition of organic waste

Description : Which one of the following statements about PYROLYSIS, which is a process for solid waste treatment is incorrect? (1) It converts the waste into solid, liquid and gas of which the resultant liquid ... pressure at temperature above 430° C. (4) It is a thermo chemical decomposition of organic waste

Last Answer : (2) The process occurs at a temperature above 430°C at atmospheric pressure. Explanation: Pyrolysis is a thermo-chemical decomposition of organic material at elevated temperatures in the ... . Pyrolysis generally takes place well above atmospheric pressure at temperatures exceeding above 430 °C.

Which one of the following statements about PYROLYSIS, which is a process for solid waste treatment is incorrect? (1) It converts the waste into solid, liquid and gas of which the resultant liquid and gas can be used to produce energy. (2) The process occurs at a temperature above 430°C at atmospheric pressure. (3) The process occurs under high pressure at temperature above 430° C. (4) It is a thermochemical decomposition of organic waste

Description : Which one of the following statements about PYROLYSIS, which is a process for solid waste treatment is incorrect? (1) It converts the waste into solid, liquid and gas of which the resultant ... high pressure at temperature above 430° C. (4) It is a thermochemical decomposition of organic waste

Last Answer : The process occurs at a temperature above 430°C at atmospheric pressure.

The reactions of `CI_(2)` gas with cold-dilute and hot-concentrated NaOH in water give sodium salts of two different oxioacids of chlorine, P and Q, r

Description : The reactions of `CI_(2)` gas with cold-dilute and hot-concentrated NaOH in water give sodium salts of two different oxioacids of chlorine, P and Q, r

Last Answer : The reactions of `CI_(2)` gas with cold-dilute and hot-concentrated NaOH in water give sodium salts of ... `H_3PO_2` D. `SOCl_2 , PCl_5` and `H_3PO_5`

The reactions of `CI_(2)` gas with cold-dilute and hot-concentrated NaOH in water give sodium salts of two different oxioacids of chlorine, P and Q, r

Description : The reactions of `CI_(2)` gas with cold-dilute and hot-concentrated NaOH in water give sodium salts of two different oxioacids of chlorine, P and Q, r

Last Answer : The reactions of `CI_(2)` gas with cold-dilute and hot-concentrated NaOH in water give ... porchloric acids D. (D) chloric and hypochlorus acids

What is the balance of chlorine gas reacts with sodium and produce sodium chlorine?

Description : What is the balance of chlorine gas reacts with sodium and produce sodium chlorine?

Last Answer : The chemical reaction is:2 Na + Cl2 = 2 NaCl

What is the balance of chlorine gas reacts with sodium and produce sodium chlorine?

Description : What is the balance of chlorine gas reacts with sodium and produce sodium chlorine?

Last Answer : The chemical reaction is:2 Na + Cl2 = 2 NaCl

In Down’s cell, why the reaction between sodium metal and chlorine gas must be avoided? And how could we prevent reaction between them?

Description : In Down’s cell, why the reaction between sodium metal and chlorine gas must be avoided? And how could we prevent reaction between them?

Last Answer : Ans:In Down’s cell electrolysis of fused NaCl yields sodium metal and chlorine gas .If these are not separated these will react to form Nacl again. So to prevent these reaction in Down’s cell, we place a steel gauze between cathode and anode.

45. When Cl2 gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from (1) Zero to + 1 and zero to –3 (2) Zero to +1 and zero to –5 (3) Zero to –1 and zero to + 5 (4) Zero –1 and zero to + 3

Description : 45. When Cl2 gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from (1) Zero to + 1 and zero to –3 (2) Zero to +1 and zero to –5 (3) Zero to –1 and zero to + 5 (4) Zero –1 and zero to + 3

Last Answer : Zero to –1 and zero to + 5

Which of the following statements about the physical properties of metal is not correct? (a) All metals are solid except mercury (b) Most metals are hard except sodium and potassium (c) Metals are not malleable (d) Most metals are ductile

Description : Which of the following statements about the physical properties of metal is not correct? (a) All metals are solid except mercury (b) Most metals are hard except sodium and potassium (c) Metals are not malleable (d) Most metals are ductile

Last Answer : Ans:(c)

Pitch creosote mixture (PCM) as compared to furnace oil is a better fuel, because its (A) Emissivity factor is higher (B) Sulphur content is lower (C) Flue gas has lower dew point thereby facilitating more waste heat recovery (D) All (A), (B) and (C)

Description : Pitch creosote mixture (PCM) as compared to furnace oil is a better fuel, because its (A) Emissivity factor is higher (B) Sulphur content is lower (C) Flue gas has lower dew point thereby facilitating more waste heat recovery (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Blowdown in a cooling tower (A) Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities (B) Increases the scale forming tendencies of water (C) Is undesirable (D) All (A), (B) & (C)

Description : Blowdown in a cooling tower (A) Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities (B) Increases the scale forming tendencies of water (C) Is undesirable (D) All (A), (B) & (C)

Last Answer : (A) Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities

Coal burning power plants and factories are responsible for about 86% of - (a) carbon monoxide in the atmosphere (b) sulphur dioxide in the atmosphere (c) chlorine in the atmosphere (d) nitrogen dioxide in the atmosphere

Description : Coal burning power plants and factories are responsible for about 86% of - (a) carbon monoxide in the atmosphere (b) sulphur dioxide in the atmosphere (c) chlorine in the atmosphere (d) nitrogen dioxide in the atmosphere

Last Answer : Ans:(b)

What is the equation for aqueous potassium iodide reacts with lead nitrate in solution forming solid lead iodide?

Description : What is the equation for aqueous potassium iodide reacts with lead nitrate in solution forming solid lead iodide?

Last Answer : The chemical equation is:2 KI + Pb(NO3)2 = 2 KNO3 + PbI2(s)

Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes (A) Poor visibility due to sky darkening (B) Irritation in eyes (C) Respiratory trouble (D) All (A), (B) and (C)

Description : Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby ... B) Irritation in eyes (C) Respiratory trouble (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Invagination by a cell membrane forming a vesicle around a solid particle is a: a) lysosome b) phagocytosis (pron: fag-o-sigh-toe-sis) c) pinocytosis (pron: pin-o-sigh-toe-sis) d) peroxisomes (pron: pay-rak-se-som)

Description : Invagination by a cell membrane forming a vesicle around a solid particle is a: a) lysosome b) phagocytosis (pron: fag-o-sigh-toe-sis) c) pinocytosis (pron: pin-o-sigh-toe-sis) d) peroxisomes (pron: pay-rak-se-som)

Last Answer : ANSWER: B -- PHAGOCYTOSIS

In what process is food absorbed in the intestines of animals ?

Description : In what process is food absorbed in the intestines of animals ?

Last Answer : Food is absorbed in the intestines of animals in the process of absorption.

Food is normally digested in the (a) Liver (b) Stomach (c) Small intestines (d) Large intestines

Description : Food is normally digested in the (a) Liver (b) Stomach (c) Small intestines (d) Large intestines

Last Answer : Ans:(c)

The length of small intestine in a deer is more as compared to the length of small intestine of a tiger. The reason for this is — (a) Mode of intake of food. (b) Type of food consumed. (c) Presence or absence of villi in intestines. (d) Presence or absence of digestive enzymes

Description : The length of small intestine in a deer is more as compared to the length of small intestine of a tiger. The reason for this is — (a) Mode of intake of food. (b) Type of food consumed. (c) Presence or absence of villi in intestines. (d) Presence or absence of digestive enzymes

Last Answer : (b) Type of food consumed.

Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by (A) Biological oxygen pond (B) Radial settling tank (thickener) using coagulant (lime & ferrous sulphate) (C) Lagoons (D) Filtration

Description : Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by (A) Biological oxygen pond (B) Radial settling tank (thickener) using coagulant (lime & ferrous sulphate) (C) Lagoons (D) Filtration

Last Answer : (B) Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)

Why dry ice sublimating from a solid to a gas is a physical change?

Description : Why dry ice sublimating from a solid to a gas is a physical change?

Last Answer : Physical changes can be undone, and the substance undergoing thechange is still chemically the same thing. It is just in adifferent form.

__________ Nature of hypo (sodium thiosulphate) makes it useful in photography. (A) Oxidising (B) Reducing (C) Complex forming (D) Photochemical

Description : __________ Nature of hypo (sodium thiosulphate) makes it useful in photography. (A) Oxidising (B) Reducing (C) Complex forming (D) Photochemical

Last Answer : (C) Complex forming

Which of the following waste types are not suitable for co-combustion in cement kilns? a) Chlorine b) Hydrogen c) Calcium d) Carbonate

Description : Which of the following waste types are not suitable for co-combustion in cement kilns? a) Chlorine b) Hydrogen c) Calcium d) Carbonate

Last Answer : Chlorine

Explain why burning of wood and cutting it into small pieces are considered as two different types of changes. -Science-7

Description : Explain why burning of wood and cutting it into small pieces are considered as two different types of changes. -Science-7

Last Answer : Burning of wood is a chemical change because in burning new substances are formed as Wood + Oxygen = Charcoal + Carbon dioxide + Heat + Light But cutting it into small pieces is physical change because no new substance is formed. We can only reduce the size of wood.

If you have only one match and you walked into a room where there was an oil burner, a kerosene lamp, and a wood burning stove, what would you light first? ..the kerosene lamp because it is easier ..the oil burner... the wood burning stove... the thing in my hand

Description : If you have only one match and you walked into a room where there was an oil burner, a kerosene lamp, and a wood burning stove, what would you light first? ..the kerosene lamp because it is easier ..the oil burner... the wood burning stove... the thing in my hand

Last Answer : the thing in my hand

Salt A commonly used in bakery products on heating gets converted into another salt B which itself is used for removal the hardness of water and a gas C is evolved. The gas C when passed through lime water ,turns it milky. Identify A,B and C. (a) A is sodium hydrogen carbonate ,B is hydrous sodium carbonate and c is carbon dioxide (b)A is sodium carbonate ,B is sodium hydrogen carbonate and c is Carbon monoxide © A is baking soda ,B is washing soda and C is carbon dioxide (d) both a and c

Description : Salt A commonly used in bakery products on heating gets converted into another salt B which itself is used for removal the hardness of water and a gas C is evolved. The gas C when passed through lime water ,turns it ... © A is baking soda ,B is washing soda and C is carbon dioxide (d) both a and c

Last Answer : (d) both a and c

What is one the negative consequences of burning waste?

Description : What is one the negative consequences of burning waste?

Last Answer : It releases toxic fumes and also contributes to climate change.

One of the best solutions to get rid of non-biodeadable waste is – (1) Burning (2) Dumping (3) Burying (4) Recycling

Description : One of the best solutions to get rid of non-biodeadable waste is – (1) Burning (2) Dumping (3) Burying (4) Recycling

Last Answer : (4) Recycling Explanation: The best way to manage nonbiodegradeble wastes such as plastics, metals and electronics is Reduce, Reuse and Recycle. The waste product can be recycled to make it ... to the environment. Recycling is by far the most environmentally friendly option that one can choose.

Which of the following describes incineration? a. Flaming The Loop Before Transferring Bacteria b. Burning Medical Waste c. Burning Cattle That Died Of Anthrax d. A-C Are Correct

Description : Which of the following describes incineration? a. Flaming The Loop Before Transferring Bacteria b. Burning Medical Waste c. Burning Cattle That Died Of Anthrax d. A-C Are Correct

Last Answer : d. A-C Are Correct

The maximum emission of pollutants from fuel sources in India is caused by : (A) Coal (B) Firewood (C) Refuse burning (D) Vegetable waste product

Description : The maximum emission of pollutants from fuel sources in India is caused by : (A) Coal (B) Firewood (C) Refuse burning (D) Vegetable waste product

Last Answer : Answer: B  As many as 115,000 people die in India each year from coal-fired power plant po llution, costing the country about $4.6 billion, according to a groundbreaking new study released ... generation in India and its usage is continuously increasing to meet the energy demands of the country.

What is the process of a solid turning directly into a gas called?

Description : What is the process of a solid turning directly into a gas called?

Last Answer : A: Sublimation.

What is Burning sugar for caramel is a physical change or a chemical change?

Description : What is Burning sugar for caramel is a physical change or a chemical change?

Last Answer : Need answer

Is burning a pencil a physical change?

Description : Is burning a pencil a physical change?

Last Answer : No it is not, because once the pencil is burned it is no longerwood. It is now ashes. Once a substance changes to a different one,that is a chemical change.

Pick out the correct statement. (A) Higher hold up of the solid in the rotary dryer results in better exposure of the solids to the gas (B) The 'Hatta number' is important in problems involving gas absorption without chemical reaction (C) For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both components is linear in the case of steady state equimolal counter-diffusion (D) Total reflux in case of distillation operation requires infinite number of plates for a binary system separation

Description : Pick out the correct statement. (A) Higher hold up of the solid in the rotary dryer results in better exposure of the solids to the gas (B) The 'Hatta number' is ... reflux in case of distillation operation requires infinite number of plates for a binary system separation

Last Answer : (C) For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both components is linear in the case of steady state equimolal counter-diffusion