Chemistry Around Us

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Everyday chemistry

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Valexa permata

Indonesia

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Chemistry Around Us


Froggy Jumps Chemistry Around UsVersion en ligne Everyday chemistry par Valexa permata 1 What is the chemical formula for table salt commonly used in foods? a KCl b NaCl c Na2SO4 2 Which gas is most associated with the greenhouse effect and climate change? a Oxygen (O2) b Carbon dioxide (CO2) c Nitrogen (N2) 3 Which process changes water to steam when heat is added? a Freezing b Evaporation c Condensation 4 Which term describes a chemical reaction that forms new substances from rearranged atoms? a Mixture b Physical change c Chemical reaction 5 Which acid is commonly found in citrus fruits? a Acetic acid b Citric acid c Hydrochloric acid 6 What is the main solvent in most kitchen solutions? a Vinegar b Water c Ethanol 7 Which property describes how easily a material catches fire? a Flammability b Density c Viscosity 8 The pH scale ranges from which to which values? a 0 to 14 b 0 to 10 c 1 to 7 9 Which gas is released when baking soda reacts with vinegar? a Carbon dioxide (CO2) b Oxygen (O2) c Nitrogen (N2) 10 What is the term for a mixture in which components retain their own properties? a Solution b Heterogeneous mixture c Compound 11 What is the universal solvent in most reactions? a Water b Alcohol c Oil 12 pH of a neutral solution at 25°C is what? a 0 b 7 c 14 13 Which pigment gives plants their green color? a Chlorophyll b Melanin c Carotene 14 Which gas is produced when baking soda reacts with an acid? a Oxygen b Nitrogen c Carbon dioxide 15 What is the process of a solid turning directly into a gas? a Condensation b Sublimation c Evaporation 16 What type of chemical bond involves transferring electrons? a Covalent bond b Metallic bond c Ionic bond 17 What happens during rusting of iron? a Iron oxidizes to form iron oxide b Iron evaporates c Iron reduces to iron(II) 18 Which polymer is commonly used to make plastic bags? a Polyvinyl chloride b Polyethylene c Polystyrene 19 Which indicator turns red in acidic solutions? a Phenolphthalein b Methyl orange c Bromothymol blue 20 What process uses electricity to split water into hydrogen and oxygen? a Fermentation b Combustion c Electrolysis of water 21 Why is polyethylene plastic widely used in daily life? a Dissolves easily in water b Light, strong, and durable c Can be eaten 22 Which gas is most commonly used in welding processes? a Argon b Oxygen c Nitrogen 23 Which polymer is used in bulletproof vests? a Polyethylene terephthalate (PET) b Nylon-6 c Kevlar (poly-paraphenylene terephthalamide) 24 Which compound is responsible for the pungent smell of onions when cut? a Sulfur dioxide b Propanethial-S-oxide c Hydrogen sulfide 25 Which process is used to separate crude oil into useful fractions? a Chromatography b Crystallization c Fractional distillation 26 Which compound is used in refrigerators as a coolant but is being phased out due to ozone depletion? a Carbon dioxide b Chlorofluorocarbons (CFCs) c Ammonia 27 Why does soap help clean oily hands? a Soap is acidic b Soap has hydrophilic and hydrophobic parts c Soap evaporates with oil 28 Why does iron rust when left outside? a Reaction with nitrogen b Reaction with hydrogen c Reaction with oxygen and water 29 Why does milk turn sour after a few days? a Fermentation producing lactic acid b Combustion reaction c Oxidation reaction 30 Why does LPG (liquefied petroleum gas) smell strong even though it is odorless? a Ethyl mercaptan is added b Sulfur dioxide is added c Ammonia is added 31 Why does bread rise when baked? a Nitrogen is released b Oxygen is released c Carbon dioxide from yeast fermentation is released 32 Why does chlorine get added to swimming pools? a To kill bacteria and disinfect b To add oxygen c To make water taste better 33 Why does food spoil faster in summer? a Sunlight neutralizes acids b Higher temperature speeds up bacterial growth c Water evaporates faster 34 Why does shampoo clean hair better than plain water? a It contains surfactants that remove oil b It neutralizes acids c It reacts with oxygen 35 Why does lemon juice taste sour? a It contains acetic acid b It contains hydrochloric acid c It contains citric acid 36 Why is distilled water used in experiments instead of tap water? a It contains more minerals b It is free from impurities and ions c It evaporates quickly 37 Why is hydrochloric acid often used in titration? a It evaporates quickly b It neutralizes bases slowly c It has a known concentration and strong reactivity 38 Why is a Bunsen burner used in labs? a To provide a controllable heat source b To measure pressure c To produce oxygen 39 Why is glassware preferred in chemical experiments? a It is resistant to heat and most chemicals b It evaporates quickly c It neutralizes bases 40 Why is potassium permanganate used in redox experiments? a It evaporates quickly b It is a strong oxidizing agent c It reacts with oxygen

Chemistry Around Us

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Chemistry Around UsVersion en ligne

par Valexa permata

What is the chemical formula for table salt commonly used in foods?

Which gas is most associated with the greenhouse effect and climate change?

Which process changes water to steam when heat is added?

Which term describes a chemical reaction that forms new substances from rearranged atoms?

Which acid is commonly found in citrus fruits?

What is the main solvent in most kitchen solutions?

Which property describes how easily a material catches fire?

The pH scale ranges from which to which values?

Which gas is released when baking soda reacts with vinegar?

What is the term for a mixture in which components retain their own properties?

What is the universal solvent in most reactions?

pH of a neutral solution at 25°C is what?

Which pigment gives plants their green color?

Which gas is produced when baking soda reacts with an acid?

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

What type of chemical bond involves transferring electrons?

What happens during rusting of iron?

Which polymer is commonly used to make plastic bags?

Which indicator turns red in acidic solutions?

What process uses electricity to split water into hydrogen and oxygen?

Why is polyethylene plastic widely used in daily life?

Which gas is most commonly used in welding processes?

Which polymer is used in bulletproof vests?

Which compound is responsible for the pungent smell of onions when cut?

Which process is used to separate crude oil into useful fractions?

Which compound is used in refrigerators as a coolant but is being phased out due to ozone depletion?

Why does soap help clean oily hands?

Why does iron rust when left outside?

Why does milk turn sour after a few days?

Why does LPG (liquefied petroleum gas) smell strong even though it is odorless?

Why does bread rise when baked?

Why does chlorine get added to swimming pools?

Why does food spoil faster in summer?

Why does shampoo clean hair better than plain water?

Why does lemon juice taste sour?

Why is distilled water used in experiments instead of tap water?

Why is hydrochloric acid often used in titration?

Why is a Bunsen burner used in labs?

Why is glassware preferred in chemical experiments?

Why is potassium permanganate used in redox experiments?