Counting Atoms
What is name of the element below?
Hg
Mercury
What side of a chemical equation, left or right, are the reactants?
left side
What does CGLTPO stand for?
Color Gas Light Temperature Precipitate Odor
Give one example from the periodic table of a METAL.
Gold
The large # in front of the chemical formula is called.....
a coefficient
What does the Law of Conservation of Mass state?
mass cannot be created nor destroyed. (both sides of an equation should be equal)
Describe one difference between physical and chemical change.
physical- change appearance
chemical- new substance
Give two examples of a metalloid.
Boron
Arsenic
How many molecules are in the formula below?
2KClO₃
2 (coefficient)
Does this chemical equation follow the law of conservation of mass? EXPLAIN.
(CH₄ + 2O₂ → CO₂ + 2H₂O)
yes. both sides are equal. 9 total atoms on each
Give an example of a precipitate.
Two clear solutions forming a solid.
Milk and coke.
What do we classify a shiny and good conductor?
METAL
How many Hydrogen atoms are in the formula below?
CH₃COOH
4
What would be the missing mass?
16g + 64g ---> 44g + ________
36g
Give two examples of a physical change.
Give two examples of a chemical change.
Physical- something sinking. change in shape
Chemical- fire, light, gas
What part of the periodic table can we find a semiconductor that is also brittle?
along the staircase as it is a METALLOID.
How many elements and total atoms are in the formula below?
C₂H₅OH
elements- 3
atoms-9
How many grams is needed for this equation to follow the Law of Conservation of Mass?
64g + 192g ---> 152g + ______?
104g
If I take two colorless gasses and mix them together, a brown gas will be produced. Which of the choices provides evidence of a chemical reaction?
A. gas is present
B. number of atoms remains unchanged
C. state of matter remains the same
D. brown gas is produced.
D
What are the physical properties of Sulfur??
insulator
brittle