L>rebab.net Worksheet Answers: Physical and Chemical Changes
Worksheet Answers: Physical and Chemical Changes
1. Brand each procedure as a physics or chemistry change:a. Perfume evaporating on her skin - physicalb. Butter melt - physicalc. Wood rotting - chemicald. Charcoal heater a grill - check out belowe. Autumn leaves transforming color - chemicalf. A warm glass cracked when placed in cold water - physicalg. Melting copper steel - physics h. Burning street - chemicali. Mixing street in water - physicalj. Digesting food - chemical
Part (d) of this question can be taken two ways: is it asking around the charcoal producing the warmth or about the steel grill obtaining hot? The metal grill getting hot is a physical change, the charcoal reacting through oxygen (which to produce the heat) is a chemical change.2. Which of the following would NOT
it is in a physical change?a. Freeze water to make ice cubesb. Melting gold to do jewelryc. Burning gasoline in a lawnmower - this one is not a physics changed. Boil water for soupe. Tearing a piece of aluminum foilIn component (c) there actually is a physics change, in the the gasoline must first evaporate prior to it burns. However, the inquiry is asking around the burning, which is a chemistry change. Burn does not encompass the physical readjust of evaporation. 3. Which of the adhering to is not a physics change? a. Grating cheeseb. Melting cheesec. Fermenting that cheese - this one is not a physical changed. Mixing two cheeses in a bowl4. Which are physical and which are chemical changes?a. Boil - physicalb. Burn (combustion) - chemicalc. Condensation - physicald. Corrode - chemicale. Crumple - physicalf. Ferment - chemicalg. Melt - physicalh. Rust - chemicali. Crush - physicalj. Freeze - physicalk. Oxidation - chemicall. Tarnish - chemicalm. Explode - view comment belown. Grind - physicalo. Rot - chemicalp. Vaporize - physicalq. Photosynthesis - chemicalr. Sublimation - physical
Part (m) that this question can be understood two ways: walk "exposion" means the actual opening up of the container (a bomb, for example) or go it refer to the chemical inside the bomb reacting? The exposion i beg your pardon throws piece of the bomb around is a physical change, the chemical reacting within the bomb (which produces the warmth & pressure causing the bomb to shatter right into pieces) is a chemical change.5. If a particular mixture is homogeneous, girlfriend would properly conclude the the physics properties and the composition:a. Are different from one part of the sample come anotherb. Vary smoothly from peak to bottom the the samplec. Are the exact same in every small volume element from the sample - the correct answerd. No one of these6. Label each process as a physics or chemistry change:a. Moth balls progressively vaporize in a closet - physicalb. Hydrofluoric acid attacks glass (used come etch glassware) - chemicalc. A chief making a sauce with brandy is able to burn off the alcohol from the brandy, leaving simply the brandy flavoring - chemicald. Chlorine gas liquefies at -35 °C under normal press - physicale. Hydrogen burns in chlorine gas - chemical
Part (c) actually has a physical process in it. The alcohol must an initial evaporate, i m sorry is a physics change, prior to it burns (the chemistry change. The question explicitly uses the ide of burning, so comment this one together both a physical and a chemical change (if inquiry on a test) would most likely garner partial credit.7. Label each process as a physics or chemical change:a. Fogging a mirror with your breath - physicalb. Breaking a bone - physicalc. Mending a broken bone - chemicald. Burning document - chemicale. Slicing potatoes for fries - physicalf. Mix sugar with coffee - physicalg. Frying chicken - chemicalh. A pond rusting - chemicali. Document ripping - physicalj. Hardwood burning - chemicalk. Mixing water and food coloring - physicall. Food molding (rotting) - chemicalm. Composing on paper - physicaln. Dyeing fabric - see comment below
Part (n) of this question can be understood two ways: the dye can simply be absorbed by the fabric (this is a physical change) or it deserve to react chemically with the fabric (this is a chemistry change). Depending upon the fabric and also the dye involved, one or both processes may occur.8. Yes.
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Concrete is a mixture that cement and crushed rock. Also, when it cures it develops discrete mineral phases, which provides strength to the concrete.