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- 1. Multiple ChoiceThe atomic number of an element is equal to the number of _________ in an atom.protonselectronsneutrons
- 2. Multiple ChoiceThe unified mass unit (u) is based on an isotope of which element?oxygenhydrogencarbonsulfur
- 3. Multiple ChoiceIsotopes are different from regular atoms because they have a differentMassColorCharge
- 4. Multiple ChoiceWhich atom has more neutrons, potassium - 40 or argon - 40?potassium - 40argon - 40they have the same number of neutrons
- 5. Multiple Choice
Group 17 on the Periodic Table of the Elements
alkali metals
alkaline earth metals
halogens
noble gases
oxygen group
- 6. Multiple Choice
This group of elements are all gases which are fairly unreactive. The gases are used in lighted signs.
alkali metals
halogens
hydrogen group
noble gases
oxygen group
- 7. Multiple Choice
This family is all nonmetal elements that are very chemically reactive. They are found in the rocks of Earth's crust and in sea water, and in nature, they are always found combined with other elements (mainly with metals). In this family are two gases, a liquid, and a solids.
noble gases
hydrogen group
oxygen group
halogens
alkali metals
- 8. Multiple ChoiceA mixture that appears to be evenly mixed throughout:an atoma compounda homogeneous mixturea heterogeneous mixture
- 9. Multiple ChoiceTwo or more physically combined substances form —a compoudan acidan elementa mixture
- 10. Multiple ChoiceWhat is an example of a mixture?Table saltSalt waterOxygenAir
- 11. Multiple ChoiceWhich of the following is a way in which elements and compounds are similar?Elements and compounds are pure substances.Elements and compounds are both made up of different kinds of atoms.Elements and compounds can both be broken down by physical means.Elements and compounds are listed on the periodic table.
- 12. Multiple ChoiceTwo or more substances in the same place but NOT chemically combined or in a specific ratio is called —a compounda pure substancean elementa mixture
- 13. Multiple ChoiceWhat should you do if you break glass in the lab?Tell the teacher, sweep up the glass, and put it in the broken glass containerTell the teacher, sweep up the glass, and dump it into the garbagePick up the glass with your handsIgnore it; the teacher will clean it up
- 14. Multiple Choice
When should safety goggles be worn?
whenever you want to feel beautiful
when you feel like it
when chemicals could splash into your eyes OR when using glassware
when you don't have regular glasses or contacts to wear
- 15. Multiple ChoiceYou notice a beaker half full of a leftover powdered chemical and you are pretty sure you know which chemical it is. You shouldAsk the teacher what to do with the chemicalPour the chemical back into the container you think it came fromPour the chemical into the garbage canPour the chemical down the drain with the water running
- 16. Multiple ChoiceAll chemicals in the lab should be considered to be dangerousTruefalse
- 17. Multiple ChoiceYou are heating a substance in a test tube. Always point the open end of the tubetoward yourself.toward your lab partner.toward another lab station.away from all people.
- 18. Multiple ChoiceWhich of the following is NOT a part of Dalton's atomic theory?All elements are composed of atoms.Atoms are alwyas in motion.Atoms of the same element are always identical.Atoms that combine do so in simple, whole-number ratios.
- 19. Multiple ChoiceTrue or False? John Dalton believed that moving electrons exist in electron clouds around the nucleus.FalseTrue
- 20. Multiple ChoiceWhich one of the following is not part of Dalton's atomic theory?Atoms of the same element have the same chemical propertiesMatter is composed of atomsAtoms of different elements have different propertiesAtoms change into other atoms in chemical reactions
- 21. Multiple ChoiceWhich one of the following symbols represents a compound?CoCO2HeN
- 22. Multiple Choice
Select the statements that are a part of Dalton's atomic theory.
All atoms of a given element have the same mass and other properties that distinguish them from other elements.
In chemical reactions, atoms are combined, separated, or rearranged.
Atoms are made up of three subatomic particles.
When an atom bonds, its electrons are given away or shared with another atom OR it gets electrons from another atom.
- 23. Multiple ChoiceHow many protons does an Aluminum atom have? (use the picture to help you)27131440
- 24. Multiple ChoiceWhat is true about a neutral atom?The number of protons equal the number of neutronsThe number of protons equal the number of electronsThe number of neutrons equal the number of electronsThe number of protons, neutrons, and electrons are all different
- 25. Multiple ChoiceThe nucleus is ____________ charged whereas the electron cloud is ____________ charged.negatively, positivelynegatively, negativelypositively, positivelypositively, negatively
- 26. Multiple ChoiceAt higher temperaturesparticles in an object have less energyparticles in an object move fastera gas contracts
- 27. Multiple ChoiceThe state of matter that has no definite size or shape isSolidLiquidGas
- 28. Multiple ChoiceThe speed of the molecules determines the _____.volumedensitypressuretemperature
- 29. Multiple ChoiceA chemical changedoesn't really change much.creates a new substanceis a change in the state of matter
- 30. Multiple ChoiceThe mass number is equal to the number of __________ + __________ in an atom.protons, electronsprotons, neutronsneutrons, electrons
- 31. Multiple ChoiceHow many neutrons are present in an atom of tin-119?5069119169
- 32. Multiple ChoiceAt higher temperaturesparticles in an object have less energyparticles in an object move fastera gas contracts
- 33. Multiple ChoiceA gashas a definite shape but no definite volumehas a definite volume but no definite shapehas fast-moving particles
- 34. Multiple ChoiceFreezingSolid to gasLiquid to solidGas to solidLiquid to gas
- 35. Multiple ChoiceWhich state of matter has tightly packed molecules?solidliquidgas
- Answer choicesTagsAnswer choicesTags