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- Multiple ChoicePlease save your changes before editing any questions.The atomic number of an element is equal to the number of _________ in an atom.protonselectronsneutrons
- Multiple ChoicePlease save your changes before editing any questions.The unified mass unit (u) is based on an isotope of which element?oxygenhydrogencarbonsulfur
- Multiple ChoicePlease save your changes before editing any questions.Isotopes are different from regular atoms because they have a differentMassColorCharge
- Multiple ChoicePlease save your changes before editing any questions.Which atom has more neutrons, potassium - 40 or argon - 40?potassium - 40argon - 40they have the same number of neutrons
- Multiple ChoicePlease save your changes before editing any questions.
Group 17 on the Periodic Table of the Elements
alkali metals
alkaline earth metals
halogens
noble gases
oxygen group
- Multiple ChoicePlease save your changes before editing any questions.
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
- Multiple ChoicePlease save your changes before editing any questions.
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
- Multiple ChoicePlease save your changes before editing any questions.A mixture that appears to be evenly mixed throughout:an atoma compounda homogeneous mixturea heterogeneous mixture
- Multiple ChoicePlease save your changes before editing any questions.Two or more physically combined substances form —a compoudan acidan elementa mixture
- Multiple ChoicePlease save your changes before editing any questions.What is an example of a mixture?Table saltSalt waterOxygenAir
- Multiple ChoicePlease save your changes before editing any questions.Which 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.
- Multiple ChoicePlease save your changes before editing any questions.Two or more substances in the same place but NOT chemically combined or in a specific ratio is called —a compounda pure substancean elementa mixture
- Multiple ChoicePlease save your changes before editing any questions.What 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
- Multiple ChoicePlease save your changes before editing any questions.
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
- Multiple ChoicePlease save your changes before editing any questions.You 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
- Multiple ChoicePlease save your changes before editing any questions.All chemicals in the lab should be considered to be dangerousTruefalse
- Multiple ChoicePlease save your changes before editing any questions.You 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.
- Multiple ChoicePlease save your changes before editing any questions.Which 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.
- Multiple ChoicePlease save your changes before editing any questions.True or False? John Dalton believed that moving electrons exist in electron clouds around the nucleus.FalseTrue
- Multiple ChoicePlease save your changes before editing any questions.Which 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
- Multiple ChoicePlease save your changes before editing any questions.Which one of the following symbols represents a compound?CoCO2HeN
- Multiple ChoicePlease save your changes before editing any questions.
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.
- Multiple ChoicePlease save your changes before editing any questions.How many protons does an Aluminum atom have? (use the picture to help you)27131440
- Multiple ChoicePlease save your changes before editing any questions.What 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
- Multiple ChoicePlease save your changes before editing any questions.The nucleus is ____________ charged whereas the electron cloud is ____________ charged.negatively, positivelynegatively, negativelypositively, positivelypositively, negatively
- Multiple ChoicePlease save your changes before editing any questions.At higher temperaturesparticles in an object have less energyparticles in an object move fastera gas contracts
- Multiple ChoicePlease save your changes before editing any questions.The state of matter that has no definite size or shape isSolidLiquidGas
- Multiple ChoicePlease save your changes before editing any questions.The speed of the molecules determines the _____.volumedensitypressuretemperature
- Multiple ChoicePlease save your changes before editing any questions.A chemical changedoesn't really change much.creates a new substanceis a change in the state of matter
- Multiple ChoicePlease save your changes before editing any questions.The mass number is equal to the number of __________ + __________ in an atom.protons, electronsprotons, neutronsneutrons, electrons
- Multiple ChoicePlease save your changes before editing any questions.How many neutrons are present in an atom of tin-119?5069119169
- Multiple ChoicePlease save your changes before editing any questions.At higher temperaturesparticles in an object have less energyparticles in an object move fastera gas contracts
- Multiple ChoicePlease save your changes before editing any questions.A gashas a definite shape but no definite volumehas a definite volume but no definite shapehas fast-moving particles
- Multiple ChoicePlease save your changes before editing any questions.FreezingSolid to gasLiquid to solidGas to solidLiquid to gas
- Multiple ChoicePlease save your changes before editing any questions.Which state of matter has tightly packed molecules?solidliquidgas