reviewer

• what is the fundamental particle of matter?

  atoms
• how would you describe th eparticles in liquid?

  shape is indefinite and volume is definite
• c. in liquids , the particles are partly close to eachother
• which state of matter does not have definite shape?

  gas and liquid
• what happens to the particles when a liquid becomes a gas?

  distance

  • farther away

  speed

  • faster

  energy

  • increase
• arrange the 3 phases of matter in decreasing order of kinetic energy

  • gas
  • liquid
  • solid
• why do all matter have mass and take up space?

  because they are made of atoms
• in which state of matter are the particles exhibiting a vibration motion and moving the leastt randomly?

  solid
• what is the best description of solids?

  shape

  • definite

  volume

  • definite
• why are solids difficult to compress?

  because they are already compressed
• why cant we drink water in ice form?

  c. the particles of ice are rigidly packed
• rafael observed that there were puddles of water on the bathroom floor. after a few minutes , it dries up due to the warm temparature. what happened to the water?

  c. it turned into water vapor and blended with air
• nigel gets a dry glass and pours cold wter with some ice into it. he left the glass for a while to get some bread, and when he got back, he saw that the outside of the glass was wet with water droplets. what phase change of matter did he observe?

  condensation
• which is an example of sublimation?

  1. albratoss hung in the bathroom decreases in size
• when you place a pot of water on the stove and heat the water, you notice that bubbles are coming from throughout . what phase change is the water undergoing?

  evaporation
• which of the following demonstrated a physical change in matter?

  c. melting of ice
• the covered pot of the soup is simmering on a stove, and there are water droplets in the inner coover of the pot. what sequence can you infer has occured?

  d. vaporization and condensation
• a glass of salt water is put on a windowsill. after several t=days, the water disappeared and there was only a film of white crystals left at the bottom. which best explains what has happened?

  evaporation
• lightest and smallest particle of an atom?

  electron
• what atomic model best describes the modern atomic theory?

  quantum mechanical model
• what phase change occurs when an air freshener is exposed to air and reduces in size?

  sublimation
• where are the electrons located?

  electron cloud
• who proposed the plum pudding model?

  joseph john thompson
• how do we determine the number of neutrons in an atom?

  subtract the atomic mass to the atomic number
• what are the particles found in the nucleus?

  proton and neutron
• Which of the following statements is INCORRECT?

  1. Electrons are located outside the nucleus.

  2. Electrons have less mass and have a negative charge.

  3. The number of electrons is equal to the number of protons.

  4. Electrons are negatively charged particles and it is where the mass of the atom is concentrated.

  • 4
• Calculate the number of subatomic particles for the following atom:

  no. of protons

  • 23

  no. of electrons

  • 23

  no. of neutrons 32

  
• how can atoms aquiare a change?

  if it gains electrons
• how is plum pudding differenet to solid sphere?

  there is negatively charged electrons which is smaller than an atom
• what is the symbol of sodium?

  Na
• who formed the triad of elements?

  johann dobreiner
• what is the classification of most elements on the left side of the periodic table?

  metaloids or metals
• how can pte be used for scientists?

  to identify all the elemnt's physical and chemical properties
• what do we call vertical collumns in pte?

  groups or families
• if u want to build a house with a strong foundation what should u use?

  iron