Show:
Atoms
Periodic Table
Chemical / Physical
Compounds / Mixtures
Phase Changes
100
Which type of particles are found in "the cloud" and what is their charge?
What is electrons, negatively charged.
100
Who is credited with making the very 1st periodic table arranged on atomic mass (NOT the modern version used today.)
Who is Dmitri Mendeleev
100
Photosynthesis would be considered which type of change? Cutting a piece of paper is considered which type of change?
What is chemical, physical.
100
BOTH Mixtures and Compounds combine in SPECIFIC PROPORTIONS. True or false?
What is False. Only compounds have specific proportions or chemical formulas. Mixtures combine randomly.
100
Water droplets on the outside of a glass would be an example of this type of phase change...
What is condensation.
200
Where is almost ALL of the mass located in the atom?
What is the nucleus.
200
How many elements are organized on the periodic table?
What is 118
200
A gas burning lamp would be an example of what type of change occurring? Boiling water is what type of change?
What is chemical, physical.
200
Solutions would be considered....(element, compound or mixture?) Be VERY specific!
What is a homogeneous mixture.
200
Describe the movement of particles in all 4 states of matter.
What is solid - vibrate in place, liquid - particles can slide past each other / take shape on container. Gas - particles move very fast & randomly. Gases expand as far as their container allows. Plasma - charged particles move extremely fast with high temperature.
300
Explain what a pure substance is. Give examples of at LEAST 4 pure substances classifications. (Mixtures, Atoms, etc?)
What is a substance that contains only ONE type of atom or particle. Examples include atoms, molecules, elements, compounds. NEVER mixtures!!!
300
Atoms in the same group have the same number of valence electrons. True or false?
What is TRUE. Lewis dot model would show the same number of valence for EVERY element in the same group.
300
A _____________ change results in the formation of a new ___________ that has new and different properties from the individual elements that make them up.
What is chemical, compound
300
Explain how mixtures combine. How do compounds combine? Which is easier to separate?
What is mixtures combine PHYSICALLY and contain at least two or more elements / substances. Compounds combine CHEMICALLY and contain AT LEAST 2 or more different types of elements. Mixtures are easier to separate because they can be separated by physical means (filtering, picking apart, etc.)
300
You place various objects in water. In order for the objects to float, their density must be __________than the density of water. What is the density of water? (Use correct units!)
What is LESS, 1 g/ml
400
A solid that has a fixed composition is DISSOLVED in a liquid and the liquid appears to be uniform throughout. This best describes the formation of a.... BE SPECIFIC! (Need the TYPE & NAME for this special type of...).
What is a homogeneous mixture - a solution.
400
What is the last family (group 18) called on the periodic table? Explain how these elements got that name.
What is Noble Gases. They are called this because they do not react due to a full valence shell which makes them unable to bond with other elements. They are "royalty" that don't mix with the other peasants. ;)
400
What property describes "the ability to burn"? What describes the "explosiveness" of a substance? Are these physical or chemical properties? Explain the difference between a physical and chemical property.
What is flammability, combustibility. These are Chemical properties. Physical - can observe without changing the identity of substance. Chemical - must conduct experiments to reveal them (will end up changing the identity of the substance to determine these.)
400
An acid and a base react to form a new compound with new properties. What is it?
What is a salt.
400
What type of change is water boiling? Explain what happens on the molecular level as a liquid is being heated to boil. What would then happen if you placed this boiling water in a freezer. Would it expand or contract EXPLAIN FULLY & mention kinetic energy btw molecules.
What is physical change. Molecules move faster (gain more KE) as they are begin heated. Liquid molecules change to a gas as they gain more energy. This explains bubbles forming in a boiling liquid. In the freezer, molecules slow down (KE decreases) and the liquid would expand as it freezes.
500
You have 32g or Sodium and 30g of Chlorine. How many grams of table salt or Sodium Chloride would you have after Na & Cl react? What LAW says that you must have the same amount of products and reactants in a chemical reaction such as this?
What is 62g of table saltor/ sodium chloride. Law of Conservation of Matter.
500
Lithium has two orbitals and one valence electron. What group & period is lithium in? Explain how you know.
What is 1st group & 2nd row or period. Group number (ones place) tells you valence electrons while periods reveal the number of energy levels or shells an atom has.
500
Does a physical change result in the formation of NEW atoms or molecules. Explain fully.
What is No. Physical changes only change the FORM of the substance. Atoms and molecules remain the same (keep the identity of the original substance - such as dry ice is still CO2 in the solid & gas form) only chemical changes create "new" or different types / combinations of molecules.
500
Explain the difference between molecule, compound & mixture?
What is molecule is made up of at LEAST 2 atoms chemically bonded together, could be SAME or DIFFERENT types of atoms. Compound contains at LEAST 2 or more DIFFERENT types of elements. Mixture contains different elements or compounds physically combined together but NOT bonded. (Salt water).
500
In a density tower where are the MOST DENSE liquids found? The LEAST dense liquids? What measurement instrument would MOST LIKELY be used to hold liquids in the tower (it has a measurement scale on the side)?
What is at the BOTTOM, at the TOP of the tower. Graduated cylinder.