Elements, Compounds and Mixtures
This element has the chemical symbol Fe and is the primary component of steel.
Iron
A change in a substance that does not alter its chemical identity, such as changing state or shape.
A physical change
The small number written after an element's symbol in a formula, which cannot be changed when balancing an equation.
Subscript
What is the force of a 3kg box moving a 5 m/s2
15N
What is Newton's 1st law of motion?
An object in motion will stay in motion and an object at rest will remain at rest until an unbalanced force acts on it.
With the symbol K, this alkali metal is found in bananas and is crucial for nerve function.
Potassium
An iron nail rusting when left outside in the rain is an example of a _________.
Chemical change
What types of atoms are involved in this equation and how many of each type of atom are in the reactants side of this chemical equation:
CH₄ + 2O₂ ⟶ CO₂ + 2H₂O
Carbon- 1
Hydrogen-4
Oxygen-4
What is the force of the 20g soccer ball moving at an acceleration of 10m/s2.
200N
Explain how Newton's 2nd law of motion is working in vehicle restraints when acceleration is constant for all passengers.
When the acceleration is constant the force of the passengers depends on the mass of that passenger.
C₈H₁₀N₄O₂
Compound
The starting materials in a chemical reaction.
reactants
These are the numbers placed in front of chemical formulas in an equation to balance the number of atoms on each side.
Coefficients
An object with a larger one of these will have a smaller acceleration if the same net force is applied to it.
Mass
Explain Newton's 2nd law acting with earth's plate tectonics
The Force needed to push the tectonic plates is dependent on the acceleration the plates are moving and the mass of the tectonic plate.
When you dissolve salt completely in water, you create this type of clear mixture where the components are indistinguishable.
Homogeneous Mixture
he new substances formed as a result of a chemical reaction.
products
products
The fundamental law stating that matter cannot be created or destroyed, which is why we must balance chemical equations.
The Law of Conservation of Mass
What is the difference between qualitative and quantitative data/relationships in science.
Quantitative has to do with specific number and can be measured or calculated (Ex: F=ma)
Qualitative uses descriptions and characteristics to describe (Ex: The larger the force of an object the more the object will accelerate)
Explain Newton's 3rd law when kicking a soccer ball
The players foot kicks the soccer ball with a force and the soccer ball applies a force back to the players foot.
A bowl of cereal with milk is this type of mixture because the components remain separate and visible.
Heterogeneous Mixture
In the chemical reactions of photosynthesis what are the reactants? Products? Energy that causes the reaction
Reactants: Water, Carbon Dioxide
Products: Oxygen, Glucose(sugar)
Energy: Sunlight
The coefficient needed for oxygen (O₂) on the reactants side to balance the equation.
CH₄ + O₂ ⟶ CO₂ + H₂O.
2
What is the mass of car moving at 100m/s who's force is 500N and a wind resistance of 20N.
4.8 kg
Net Force= 500-20= 480N
Mass= 480/100
Explain how all three laws are working simultaneously during a rocket launch
1st: The rocket will remain at rest until thrusters launch it the rocket will remain in motion until gravity or air resistance try to pull it back down.
2nd: The acceleration of the rocket depends on the force of the thrusters acting on it and the mass of the rocket.
3rd: The thrusters push the rocket off the ground a gravity pulls the rocket back down.