Chemistry. What are the horizontal rows on the Periodic Table called? Periods.
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Transcript of Chemistry. What are the horizontal rows on the Periodic Table called? Periods.
Chemistry
What are the horizontal rows on the Periodic Table called?
Periods
How do we determine an elements reactivity?
The group number (with the A)
What could you tell me about this element based on this picture?
1.The element is Silicon (Si)
2.There are 4 Valence Electrons (Group 4A)
3.There are 4 energy levels (Period 4)
What are the vertical columns called on the Periodic Table?
Group/Family
What element will react with Rubidium (Rb)?
Any element in group 7A
What subatomic particles go inside of the
nucleus of an atom?
Protons & Neutrons
Where are the metals located on the Periodic
Table?
Left side of the zig-zag
line
What are 3 characteristics of metals?
1. Conductors2. Malleable
3. High Reactivity
Identify the element pictured and determine the number of
neutrons this element has
Element = Silicon (Si)Neutrons: 28-14= 14
How many valence electrons and energy levels does
Chlorine (Cl) have?
7 Valence Electrons3 Energy levels
Balance the following chemical equation:
_____Al + ___Br2 ___Al2Br6
2 3
Balance the following chemical equation:
____CH4 + ____O2 ____CO2 + ____H2O22
When you have a balanced equation, as shown below, how does the mass of the reactants compare to the mass of
the products?2Al + 3Br2 Al2Br6
They’re equal!
In the following equation, how many atoms are combined to form 2 molecules of Sodium
Chloride (NaCl)?2Na + Cl2 2NaCl
On the reactant side there
are 2 Na & 2 Cl so…..4
What are the 5 signs that a chemical change has occurred?
1. Color Change2. New Substance
3. Temperature Change4. Bubbles (gas)
5. Fire
Chemical or physical change: glass being broken
Physical b/c the shape of the glass is the only thing changing
When vinegar and baking soda are combined, bubbles begin to form. Bubbles are evidence of a chemical reaction because they –
A pop when they are touched.B show that a gas is forming.C form at a fast rate.D are generally transparent. B
What is an endothermic reaction?
A reaction that makes
something feel COLD
What is an exothermic reaction?
A reaction that makes
an object HOT
If bubbles appear when you mix 2 chemicals, is this a sign
of a chemical or physical change? What do the bubbles
represent?
Chemical – bubbles represent the
formation of a gas
When I mix 2 liquids together a solid forms. Is this solid an example of a chemical or physical change?
What is this solid called?
Chemical change – the solid is a precipitate
Four students performed four different investigations by combining different
substances. Their results are shown in the table provided.
In which experiment are new substances being formed?
Experiment 1
Hydrogen peroxide breaks down to form water and oxygen gas.When this reaction occurred, the following observations were made:I - The mass of the solution remains the same.II - Phase changes are observed. III - The color of the solution remains clear. IV - The temperature of the solution increases.
Which observation is evidence that a chemical change has occurred?
Observation IV
What do we need to do to Channing to get him to
accelerate?
Apply an unbalanced force
Skyler threw the football 17 yards in 37 seconds. At what speed was the
football traveling?
0.46 yd/sec.
Brandon used a triple beam balance and determined that the mass of the rock shown was 274g. Use the image
below to determine the volume?
D=27.4 g/mL
What energy transformations take place when a battery-operated
radio is in use?
Chemical Electrical Sound