Science- Density
why is copper more dense than aluminum?
1. Copper atoms might have more mass than aluminum atom s 2. Copper atoms might be more smaller than aluminum atoms so more can fit in the same volume 3. Copper atoms might be arranged more differently than aluminum atoms so more can fit in the same volume
What are the two ways you can make an object float?
1. Increase the density of the water to make sure the water is more dense than the object. 2. Increase the volume of the water to make the object less dense than the water
If there's a piece of "wax" the density is the same as a __________________
A big piece of "wax" because they are the same substance
What is wax made of and what does it molecules look like?
Carbon and hydrogen, long molecules
How can a dense material be able to float?
If it's volume is large enough
What does it mean when an object sinks in water
It means that the object is more dense than the water
If a object is heavier could it only sink and the other object is lighter does it only float?
No a heavier object can float and a lighter object can sink as well
Liquids can sink and float in what?
Other liquids
What can liquids do in other liquids?
Sink and float
What happens to molecules when a liquid is heated?
The molecules move faster and get slightly further apart
What happens to water when it's below 4 degrees?
The molecules move further apart as they turn into ice
What happens to molecules when a liquid is cooled?
The molecules move slower and get slighter closer together
______ or any ______ has the density no matter what the size
Water, substance
Does the density always stay the same no matter what the substance is?
Yes
Does the temperature of a substance affect it's density?
Yes
Is ice less dense than water?
Yes
Can the density of an object or water be changed? And why?
Yes, because if you wanted to make the substance that normally sinks, float
how do you know if something has high density?
if something has a large mass compared to its volume
how do you know something has low density?
if something has a low mass compared to its volume
what is wood made up of?
long molecules that are arranged an packed together to make wood
what's the formula for density?
mass divided by volume
whats the difference between mass and weight?
mass is the measure of the amount of matter that makes up an object vs. weight is the force of gravity pulling down an object
how do you find a density of a substance?
measure the mass and the volume of a sample of the substance
how much will a substance with high density weigh than a large substance with a lower density?
much more
what is copper made of and does it have a high density?
of small massive atoms packed closely together, yes
How to find the volume using the WDM?
place object in water, once water rises subtract the original water level to the final water level
when hydrogen and carbon are linked together in a chain and not as tightly packed as the atoms in copper, what is this?
plastic
the density of copper is greater than the density of ______ & _____
plastic and wood
the density of wood is more similar to _______ than to ________
plastic, copper
what's density?
property of an object/ compactness of an object
what's another way of finding volume?
the Water Displacement Method (wdm)
What's the density of a material based on?
the atoms or molecules a substance is based on
if you put 2 cubes side by side and they have the same volume but one has a greater mass why one is more dense?
the cube with a greater mass because the bigger the mass the more dense it is.
how can you measure the mass of an object of an object on a scale?
the scale can calculate not the gravity (weight) but only display mass
does plastic have a less density than copper?
yes
will a high density weigh more or less than a bigger substance with a lower density?
yes
