Force and motion
What force pulls objects toward the center of the Earth?
Gravity
If two forces of 25 N and 35 N act on an object in the same direction, what is the net force?
60 N
This type of substance produces hydrogen ions (H+) when dissolved in water
Acid
This term describes the maximum amount of solute that can dissolve in a solvent at a given temperature
Solubility
This products of a neutralization reaction between an acid and a base always include this substance
water
What formula is used to calculate speed?
Speed = Distance / Time
If the net force acting on an object is 0 N, how will the object's motion change?
It will not change motion (Balanced Force)
A change in shape or size without forming a new substance is called this type of change
Physical change
This subatomic particle has no electrical charge
Neutron
What is the formula of Lithium Oxide?
Lithium has a +1 ion and oxygen has a -2 ion. so the formular is Li2O
Which Newton's Law explains why an object at rest stays at rest unless acted on by an unbalanced force?
Newton's first law (law of inertia)
A car increases its velocity from 0 m/s to 20 m/s in 5 seconds. What is the acceleration
4 m/s2
Solution
Elements in the same group (family) on the periodic table share this important feature
Same number of valence electrons
What is the formular for magnesium chloride?
Magnesium forms a +2 ion and chlorine forms a -1 ion so the correct formula MgCl2
Which quantity changes when you move from Earth to the Moon: Mass or Weight?
Weight
Why do objects of different masses fall at the same rate when air resistance is ignored?
increased gravitational force is balanced by the increased mass resulting in the same acceleration
When electrons are transferred from one atom to another, this type of bond is formed
ionic bond
2
What is the correct formular for aluminum oxide
Aluminum forms a +3 ion and oxygen forms a -2 ion. The formula is Al2O3
Why type of friction occurs when a box is pushed but does not move?
Static Friction
According to Newton's Second Law, what happens to acceleration if the force increases but the mass stays the same?
Acceleration increases
This type of substance often feels slippery, tastes bitter, and turns litmus paper blue
base
Atoms gain or lose electrons in order to reach this condition
A stable electron configuration
Balance the following chemical equation H2 + O2 --> H2O
2H2 + O2 --> 2H2O