Periodic table
How many protons does Aluminium have?
13
What is the number of electrons in Silicon?
14
What is the sentence we use that help us determine the signs of chemical reaction?
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When balanced forces act up on an object, two scenarios can occur. What are these?
no movement or moving at a constant speed
What is the formula for calculating force?
F = mxa
How many neutrons does Aluminium have?
14
Which particles have the same amount of mass
Protons and neutrons
Any of the following:
color change, gas production, light production, temperature change, odor, smoke and sound, precipitate
When unbalanced forces act upon an object, the object will either ___________________ or _________________
have a change in speed or change in direction
Another acceptable answer is that object will always accelerate
What is the formula for calculating acceleration?
Name the element that has 3 energy levels and 4 valence electrons?
Silicon
Which subatomic particle has the least mass?
electron
A student mixed two chemicals and noticed that the combined liquids began to foam and sizzle. What happened?
Gas production
A student drop a marble in the water and the marble is moving through the water at a constant speed. Is this balanced or unbalanced force?
Balanced force
What is the acceleration of a 2kg object pushed with a force of 10 Newtons?
5 m/s2
How many valence electrons do the most reactive elements in the periodic table have?
1 AND 7
what is the combined (total) number of protons, electron, and neutrons in Boron
16
A student took out ice cube from the freezer and ice cube melted. Did chemical reaction happen?
No
Juan is sledding down the hill. Balanced or unbalanced?
Unbalanced force
What is the force on a 10kg elevator that is falling freely at 3 m/s2?
30 Newtons
Which element is more reactive, Potassium or Boron?
Potassium
Which element is more stable, Krypton or Chlorine?
Krypton
Two liquids were combined and a solid was formed. How do we call this?
Precipitate
Jenny is moving at a relatively the same speed as she is walking home but she makes a right turn to stop by at 7-eleven. Balanced or unbalanced?
Unbalanced force
A 5kg block is pulled across a table by a horizontal force of 20N with a frictional force of 10N opposing the motion. Calculate the acceleration
2 m/s2