Tools and Measurements
When conducting an experiment with chemicals, scientists must wear what?
Safety Goggles
An observable or measurable characteristic of an object is called a
Property
What are the three states of matter?
solid, liquid, gas
No matter what reaction or change in properties occurs, the total weight of the substance _____.
does not change/stays the same
Give the definition for "Subdivided"
Separated (or divided) into smaller pieces
What tool do scientists use to measure the volume of liquids?
Graduated Cylinder
A particle is
a tiny piece of something
When a liquid turns into a gas it is called
evaporation
In a(n) ______ system components can enter or leave the system.
open
In the Science Investigation, why couldn't we see the new substance that made the bag expand?
The (gas) particles were too small to be seen
What tool do scientists use to measure mass?
Electronic Balance Scale
Which is a physical property: color, burning, or rusting?
Color
What phase of matter has particles farthest apart from each other?
Gas
In a(n)______ system components are trapped and cannot leave the system.
closed
In the Food & Water experiment, explain what happened to the particles
The food color particles started out close together and then eventually spread out throughout the cup and changed the color of the water
_____ can be used to measure the mass of solids. _____ can be used to measure an amount of liquid.
Balance Scale
Graduated cylinder
Name 3 physical properties of matter
Color, reflectivity, magnetism, form, thermal conductivity, electrical conductivity, hardness
What phase of matter has the particles closest together?
Solid
Name one sign that a new substance has been formed
Color change
production of an odor
change of temperature
fizzing/ bubbles (gas forming)
In the Water & Oil experiment, explain what was happening with the particles in the oil and the water
Oil: the particles are less dense (density of less than 1)
Water: the particles are denser (density of more than 1)
Because oil particles have a density of less than 1, the oil will float on top of the water
If the combined weight of the powder and liquid was measured before they were mixed in a sealed bad (CLOSED SYSTEM); after they were mixed the weight would be
the same
Thermal conductivity is...
A property that measures who well heat energy can pass through it.
What state of matter has mass and takes up space?
You take a solid and see how much of the solid you can dissolve in water. By doing this, you are comparing their
solubility
Explain the Law of Conservation of Matter
No matter can ever be created or destroyed. The mass of an object always stays the same even if it's state of matter changes.