A pure substance can be separated into different elements only by a physical reaction.Question 1Select one:TrueFalseQuestion 2Not yet answeredMarked out of 4Flag questionQuestion textComplete the following phrases:The only way to decompose (break up) a compound is by using...Answer 1 Question 2Molecules of a compound...Answer 2 Question 2A mixture has Answer 3 Question 2Molecules of an element...Answer 4 Question 2Mixtures can be separated using...Answer 5 Question 2Di-atomic molecules always have...Answer 6 Question 2Question 3Not yet answeredMarked out of 1Flag questionQuestion textAtoms in an ELEMENT may have different atomic structures.Question 3Select one:TrueFalseQuestion 4Not yet answeredMarked out of 3Flag questionQuestion textWhich of the following molecules are compounds?Question 4Select one or more:H2OO2Cl2CH4N2CO2Question 5Not yet answeredMarked out of 2Flag questionQuestion textName two classes of pure substances.Answer: Question 5

Which of the following is true about compounds?1 pointthey can be physically separated into their component elementsthey have compositions that varythey have properties to those of their component elementsthey are substances made of two or more elements bonded together

A chemical compound may be separated into its elements by how many of the following methods?Physical methods, Chemical methods, filtration, Dissolving

can compound be seperated by physical means

Which of the following is TRUE about a mixture?a.It is a classification under compounds.b.It is one of the two types of pure substance.c.Its components cannot be separated physically.d.It retains the property of the components after mixing.

1. Which of the following is NOT a state of matter?• a) Solid• b) Liquid• c) Heat• d) Gas2. What is another name for a homogeneous mixture?• a) Solution• b) Compound• c) Element• d) Particle3. Which of the following is a characteristic of a heterogeneous mixture?• a) Uniform composition• b) Different phases can be seen• c) Cannot be separated• d) Only made of liquids4. Which method is best for separating a mixture of alcohol and water?• a) Filtration• b) Distillation• c) Magnetism• d) Decanting5. Filtration is most suitable for separating which type of mixture?• a) Salt and water• b) Sand and water• c) Oil and water• d) Sugar and water6. Which SI unit is used for measuring mass?• a) Liter• b) Kelvin• c) Gram• d) Meter7. Which tool is typically used to measure the volume of a liquid?• a) Balance• b) Caliper• c) Thermometer• d) Graduated cylinder8. How many significant numbers are in the measurement 406.02?• a) 3• b) 4• c) 5• d) 69. Which of the following is a pure substance?• a) Air• b) Orange juice• c) Iron• d) Salad10.Which process involves the heating of a liquid to create vapor and thencooling that vapor to create a liquid?• a) Filtration• b) Chromatography• c) Distillation• d) Sedimentation11.What is the SI unit for temperature?• a) Celsius• b) Fahrenheit• c) Kelvin• d) Gram12.Which tool would be best for measuring the length of a small rodaccurately?• a) Meter stick• b) Caliper• c) Ruler• d) Graduated cylinder13.How many significant figures are in the number 0.003405?• a) 4• b) 6• c) 3• d) 514.Which of these is NOT a heterogeneous mixture?• a) A salad• b) A bowl of cereal with milk• c) Saltwater• d) Muddy water15.Elements and compounds are both examples of:• a) Mixtures• b) Heterogeneous mixtures• c) Homogeneous mixtures• d) Pure substances16.The SI unit for amount of substance is:• a) Kelvin• b) Mole• c) Gram• d) Liter17.Which method would be best for separating colored pigments in ink?• a) Distillation• b) Filtration• c) Chromatography• d) Decanting18.In which type of mixture are the components uniformly distributed?• a) Heterogeneous• b) Homogeneous19.Which of the following tools would NOT be suitable for measuringmass?• a) Triple beam balance• b) Graduated cylinder• c) Electronic balance• d) Spring scale20.The number 100.00 has how many significant figures?• a) 3• b) 5• c) 4• d) 2