Chemistry
What is formed when aluminium burns in air?
Aluminium oxide.
(Air has oxygen).
What is group 1 on the periodic table called?
Alkali Metals
What happens when a blue filter is put on a white beam of light?
Blue light is transmitted while all the other colors are absorbed.
Does light travel in straight or curved lines?
Straight lines.
Light is reflected off every material. True or false.
True (it does not matter whether the object is translucent, transparent, and opaque).
How to find the melting point from a graph?
It is the horizontal/flat part of the graph.
What is group 7 on the periodic table called?
Halogen.
Why does a leaf look green?
Green light is transmitted while the other colors are absorbed.
What does it mean if light is transmitted?
Light goes through.
What is the role of the pupil?
Hole that light will enter through.
Why during phase change (melting/boiling/evaporation/etc), the graph stays horizontal and temperature does not increase?
Energy is being used to break the bonds.
Which element is unreactive: Na, Mg, Ca, He, Br, or Cl?
He = because it is a noble gas and noble gases are unreactive.
What is the role of a catalytic converter?
- These gases are considered less harmful to the environment.
What happens when we hit an opaque object?
Some light is reflected and some light is absorbed.
What is the role of the retina?
Based on this information, does the type of acid affect how fast the metal disappears?
- Metal A > sulfuric acid = took 20 seconds; nitric acid = took 30 seconds.
- Metal B > sulfuric acid = took 25 seconds; nitric acid = took 32 seconds.
- Metal C > sulfuric acid = took 19 seconds; nitric acid = took 31 seconds.
Yes, the type of acid does affect how long it takes for the metal to disappear. Sulfuric acid made the metal disappear faster.
What does malleable mean?
Can be hammered into sheets.
What is the difference between specular and diffuse reflection?
- Specular reflection = light is reflected evenly (happens on smooth surfaces).
- Diffuse reflection = light is reflected unevenly - the light is scattered in all directions (happens on rough surfaces)
What are the two types of cells found in the retina? What is their role?
- Rod cells = detects shape, size, form, and black/white/gray
- Cone cells = detects colors.
What is the role of the lens?
The lens refracts light (focuses light) on the retina.
Balance this equation:
___ BaCl2 + ___ H2SO4 →____BaSO4 +____HCl
BaCl2 + H2SO4 →BaSO4 + 2HCl
Which substances will be liquids at 200 degrees Celsius?
A - Melting point = 180 and Boiling point = 300
B - Melting point = 210 and Boiling point = 400
C - Melting point = 100 and Boiling point = 190
D - Melting point = 150 and Boiling point = 350
A and D.
Is chlorine more chemically similar to bromine or sulfur?
More similar to bromine (elements in the same group are more similar than elements in the same period).
What are the three types of cone cells?
Red, green, and blue cone cells.
What is the role of the cornea?
Transparent covering that covers the eye. Helps focus the light.