Top 10k strings from Elements, Compounds, Mixtures and Separations (1982)(Calpac Educational Software).z80 in <root> / bin / z80 / software / Sinclair Spectrum Collection TOSEC.exe / Sinclair ZX Spectrum - Utilities & Educational / Sinclair ZX Spectrum - Utilities & Educational - [Z80] (TOSEC-v2007-01-01) /
Back to the directory listing
8 t$="true ":
7 o$="true ":
3 o$="false":
3 e$="not correct":
2 t$="true "
2 t$="false":
2 o$="true "
2 e$="correct ":
2 "Well done."
1 s$="true "
1 s$="false"
1 r$="not correct"
1 r$="correct "
1 physical change
1 iron sulphide
1 into their constituent elements.":
1 fractional
1 f$="true "
1 chemical change
1 Second statement
1 Question ";n''"
1 Is the second statement true?
1 Is the 2nd statement a correct explanation of the 1st?
1 Iron sulphide
1 First Statement"
1 ;"Type y or n.
1 ;"Type e for explanation/comment otherwise press the ENTER key."
1 ;"Type 1, 2 or 3."
1 ;"Press the ENTER key to continue."
1 ;"Is the first statement true?"
1 ;"1. A revision tutorial"''" 2. A simple test"''" 3. A copy of the questions"'"
1 ;" Elements, Compounds, Mixtures
1 ."''"The solid which remains in the filter paper is called the"'"
1 ."''"No new substance is formed -"'"ice and water are forms of the same chemical compound."''"Melting is a change of physical state.":
1 ."''"New substances (zinc sulphate and hydrogen) are formed.":
1 )+("Well done."
1 )+("Very good."
1 )+("Good."
1 ("Excellent."
1 ''''" Elements, Compounds, Mixtures
1 '"describes how the filter paper works, but does not explain why separation by filtration is"'"classified as a physical"'"separation technique.":
1 '"You correctly answered ";s;" out"'"of 10 questions."''
1 & Educational Software
1 "correct "
1 "Your very low score indicates a poor understanding of this topic"
1 "You were wrong. "''l$
1 "You need to spend more time on this topic."
1 "You need to read through your notes and text-book again,"'"and then re-run this program."
1 "You cannot give a reason for a definition or commonly accepted term."''"Scientists have simply agreed to use the term in that way so that they can understand each other.":
1 "With dilute hydrochloric acid:"''"
1 "When two electrodes are placed in water, and an electric"'"current is passed, hydrogen and oxygen are formed."''"A small amount of sulphuric acidis normally added to increase the electrical conductivity."''"Two volumes of hydrogen are"'"formed for every one volume of oxygen."
1 "Well done, you were right.":
1 "Water passes through the filter paper, but particles of sand"'"do not":
1 "Water is a mixture of hydrogen and oxygen and not a compound":
1 "Water is a
1 "Water can be split up by"'"electrolysis to give hydrogen and oxygen":
1 "This is the definition of a"'"compound."''"When elements are chemically"'"bonded together, they can only be separated by chemical"'"processes."''"Chemical reactions can break thebonds between atoms."'"Physical processes cannot do"'"this.":
1 "This is a definition of the term""element""."''"""chemical means"" is stated so that radioactive decay and the atom-smashing methods of nuclearphysics are excluded.":
1 "This describes what happens"'"when the mixture of sand and"'"water is filtered."''"The liquid which passes through the filter paper is called the
1 "There is no simple relationship between colour and solubility, or between colour and extent of absorption."''"Therefore the colour of a"'"compound cannot
1 "The term ""substances"" in this"'"context refers to either "'"elements or compounds."''"The statement is effectively"'"the definition of a physical"'"change.":
1 "The separation of sand from"'"water by filtration is a"'"physical method of separation":
1 "The reaction is started by"'"heating the magnesium strongly in a bunsen flame."''"The magnesium oxide formed has quite different properties to either the magnesium metal or the oxygen."''"A new compound is formed.":
1 "The properties of iron sulphide are different from those of ironand sulphur":
1 "The melting of ice to form wateris an example of a chemical"'"change":
1 "The melting of ice to form wateris a
1 "The distance moved by a"'"substance on chromatography"'"paper is determined by its"'"colour":
1 "The distance moved by a compoundon chromatography paper is"'"determined by:"''"
1 "The coloured substances found ingrass can be separated by paper chromatography":
1 "The chromatogram is developed byallowing a solvent to rise up the paper by capillary action."''"A number of green and yellow"'"spots rise to different"'"positions. Each spot is a"'"different coloured compound.":
1 "The change which occurs when"'"magnesium is burned in air is classified as a chemical change":
1 "Silver-grey magnesium metal"'"burns with a brilliant white"'"flame to form a white powder."''"A considerable amount of heat is given out, and the change"'"cannot be easily reversed.":
1 "Sand and water together form a mixture."''"No new chemical substances are formed when this mixture is"'"separated. The water and the"'"sand were present both before and after the filtration."''"A change which does not involve the creation of new chemical"'"substances is classified as a physical change.":
1 "Physical separation techniques include:"''"
1 "No, You were wrong.":
1 "Magnesium reacts with oxygen"'"from the air to form a new"'"compound":
1 "Liquid oxygen boils at -183 and liquid nitrogen at -196 degrees Celsius."''"The small difference in boiling points allows the two liquids tobe separated by fractional"'"distillation."''"The liquid nitrogen has the"'"lower boiling point, and so"'"distils off first.":
1 "Liquid oxygen and liquid"'"nitrogen have different boiling points":
1 "Liquid air is separated into"'"oxygen and nitrogen by"'"
1 "Liquefied air can be separated into oxygen and nitrogen by"'"simple distillation":
1 "Iron and sulphur combine in"'"fixed proportions by mass to"'"form iron sulphide":
1 "However, zinc dissolving in"'"hydrochloric acid is a
1 "Heat energy must be provided to melt ice":
1 "Grass is ground up with a"'"liquid to extract the pigments (coloured substances)."''"A spot of the solution obtained is placed near the bottom of thechromatography paper."
1 "Good, you were right."''l$
1 "Do you want:";
1 "Do you want to run the program again?"
1 "Do you want to go through the questions in which you made"'"mistakes?"
1 "Changes such as water boiling"'"and salt dissolving in water"'"are physical changes":
1 "Both statements are true, and the 2nd is a correct explanationof the 1st."'l$'
1 "Boiling is a change of physical state - no new chemical"'"substance is formed."''"When substances like salt or"'"sugar dissolve in water, no new compound is formed. The salt or sugar particles just mix in withthe water."
1 "Attractive forces exist between the water molecules in ice."'"These forces hold the molecules in an orderly crystal structure."''"Heat energy can overcome these attractive forces. Then the "'"molecules can move around freelyas liquid water."''"The molecules are not broken, just separated. No new chemical substance is formed.":
1 "An element is made of"'"indivisible and indestructible particles called molecules":
1 "An element is a substance which cannot be split into simpler"'"substances by chemical means":
1 "Although some elements normally exist as molecules, the majoritydo not."''"Molecules can be broken up to give atoms, so they are not"'"indivisible."''"The atomic theory suggests that:"''"
1 "All pure samples of the same"'"chemical compound contain the same elements combined in fixed proportions by mass."''"This is because elements consistof atoms which combine together in a fixed ratio when compounds are formed.":
1 "A compound consists of two or more elements chemically bonded together":
1 "A compound cannot be separated into simpler substances by"'"physical separation techniques":
1 "A compound and its constituent elements are different chemical substances."''"Different chemical substances"'"have diffent chemical"'"properties.":
1 "A change is described as a"'"physical change if no new"'"substances are formed":
1 "'"no new chemical substances are formed."''"The statement that"':
1 " The second statement was ";t$;" ":
1 " The first statement was ";o$;" ":
1 the distance that it travels on the chromatography paper.":
1 shows neither of these properties.":
1 on your printer?";
1 of"'"substances."''"They cannot break down
1 of hydrogen and oxygen."''"Water can be formed by burning hydrogen in oxygen - a chemical change. A lot of energy is"'"released, and a new substance isformed."''"2H + O
1 its solubility in the solvent;
1 is not the reason why
1 is magnetic;"'"
1 how strongly it is absorbed by the paper."''"Very soluble, weakly absorbed substances move furthest."''"Insoluble, strongly absorbed"'"substances do not move at all."
1 has no reaction."'''"
1 gives odourless hydrogen;
1 gives hydrogen"'"sulphide gas (rotten egg smell);
1 filtration"'"
1 f$="false"
1 distillation."''"Simple distillation is used to separate a liquid from non-"'"volatile solids."''"To separate liquids with similarboiling points, the repeated"'"condensation and re-evaporation which occurs in a fractionating column is necessary.":
1 distillation"'"
1 dissolves in some"'"organic solvents;"'"
1 chromatography"''"These methods can only be"'"used to separate
1 atoms cannot be created or"'" destroyed (by chemical means);
1 and Separations."''"
1 and Separations."
1 all matter is made of atoms;
1 all atoms of a given element are (chemically) identical.":
1 The fact that
1 Please type y
1 J J WARREN 1982
1 BSc ARCS Cert Ed
1 2"''"The proportions of hydrogen and oxygen combined together are in a fixed ratio.":
1 1982 J J Warren