Miscellaneous
How do we find MASS if we know the density and volume?
Density multiplied by volume
M=D*V
Biting into an apple is an example of what sort of change?
A physical change.
Which state of matter does the following sentence describe?
"Atoms in an energy state so low that they maintain their shape"
Solid
What is the equation for density?
Density is equal to mass divided by volume. D=m/v
______ particles suspended in a _______ or a _____ move randomly. This is known as __________ _____________. Fill in all blanks!
Solid, liquid, gas, Brownian Motion
In a chemical equation, the left side and the right side of the equation need to have...
The same number and type of atoms.
What are some examples of a chemical change occurring? (List 3 or more)
Production of light
Production of sound
Production of a precipitate
Production of a gas
Change of color
Change of odor
Change of heat
Flow, ability to change shape, malleability, conductivity, strength, and solubility are all properties of which?
Solids, Liquids, or Gases?
Solids
A substance has a mass of 12 g and a volume of 3 ml. What is its density? (MAKE SURE YOU INCLUDE UNITS IN YOUR ANSWER!)
The density is 4 g/ml
Give an example from a movie that DOES NOT uphold the Law of Conservation of Mass and explain why.
Answers will vary.
For example: When Peter Pettigrew simply waves and turns into a rat. There was no energy involved to make up for the lack of mass.
What makes up all solids, liquids, and gases?
Atoms!
A scientist cuts a sheet of paper and then lights it on fire. Explain what the scientist did using physical and chemical changes.
The scientist conducted a physical change on the paper by cutting it and the conducted a chemical change on the paper by burning it.
Cohesion, adhesion, meniscus, and viscosity are words used to describe which state of matter?
Liquids
A substance has a density of 5 g/ml and its volume is 6 ml. What is its mass?
The mass is 30 g: 5 g/ml*6 ml=30 g
In your own words, state the Law of Conservation of Mass.
The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
How do you find the volume of a rectangular object?
Length*Width*Height
What is the fundamental different between physical and chemical changes on the atomic level?
A physical change means the substance has not changed form and the atoms have not rearranged. It is still the same substance, atomically, that it was before but has simply changed form. In a chemical change, the atoms have rearranged to form something totally new.
In your own words, explain the difference between hardness and strength in solids.
Hardness: Hardness is a measure of how easy it is to scratch a solid – it is not the same as strength. Slate and concrete are very strong solids, but are easily scratched so they are not as hard. -------------- Strength: Strength is the ability of a solid to withstand a force. Metals are generally very strong, but waxy solids are easily squashed.
In your own words, explain what density is. (Hint: think about what volume means and what mass means).
Volume is how much space something takes up. Density means how much mass something has per the volume (space) it occupies, or how densely packed (concentrated) the particles of a substance are relative to its size.
In your own words, explain Buoyancy and give an example of how it works.
The power of a liquid to exert an upward force on a substance placed in it. For example, an anchor placed in water experiences the upward thrust of the anchor, but it is less than the gravity force pulling down on the anchor, which causes the anchor to sink.
Explain the steps of the Scientific Method.
Make an observation;
Ask a question;
Form a hypothesis & make a prediction;
Do a test or experimentation;
Analyze data and draw a conclusion;
Share results.
Give 3 examples of physical changes and 3 examples of chemical changes.
Answers will vary.
What is Brownian Motion?
The random movement of microscopic particles suspended in a liquid or gas, caused by collisions between these particles and the molecules of the liquid or gas.
Explain the displacement method and when you should use it.
Displacement is used to calculate the volume of an unusual solid by dropping the solid into a known amount of water and calculating the amount of water displaced through subtraction.
Give an example from a movie that UPHOLDS or maintains the Law of Conservation of Mass and explain why.
Answers will vary.
For example: When Professor Lupin takes the energy from the moon (reactant) and turns into a werewolf, it could be argued that the energy absorbed from the light from the moon was enough to equal the change in mass...it's a stretch.