Scientific Method
What is the independent variable for the experiment based on this hypothesis?
The temperature
A substance is heated from 245 K to 283 K. Does increasing the temperature also increase the kinetic energy of the particles?
True. Temperature is directly related to average kinetic energy. Increase temp.= increases energy
Is density a physical or chemical property?
Physical property
Calculate the mass of a sample of pure silver that has a volume of 15.75 cm3. (Density of silver: 10.50 g/cm3)
165.4 g
What are the two classes of matter?
Pure substance and Mixture
The dependent variable of the experiment
Gender of the baby alligator
Which state of matter is most likely to resist compression?
Solid because the atoms that make up the solid are not able to move about freely.
What is one chemical property of matter?
Reactivity of oxygen. Oxygen is a highly reactive element that is very abundant on earth and in the human body.
What is the density of a sample of an unknown substance that has a mass of 865 g and a volume of 365 cm3?
2.37 g/cm3
Are sodium (Na), chlorine (Cl), and sodium chloride (NaCl) made up of pure substances?
Yes. Even though sodium chloride is made up of two elements, it is still a pure substance. A pure substance can be either an element or a compound.
One qualitative observation that would be associated with this experiment
the eggs are much softer right before hatching
Compared with gases, do liquids have weaker or stronger forces of attraction?
have stronger forces of attraction.
Is burning wood a chemical or physical change?
Chemical change
Is grinding quartz crystals down to produce sand is an example of a physical or chemical change?
Physical
What means of separating a mixture is based on the size of the particles in the mixture?
Filtration
the temperature of the incubator is 34°C
Matter that is free to move about, moves at a great speed, and fills its available volume is a...?
Gas
Is Kool-Aid a homogeneous or heterogenous mixture?
Homogenous because Kool-Aid is dissolved in water and the different components can not be seen separately.
Show a particle drawing of a solid.
Particles are packed closely together.
How would you separate two liquids in a homogeneous mixture that have different boiling points?
Distillation
Is a hot glue gun melting a glue stick a physical or chemical change?
a hot glue gun melts a glue stick
Air is a homogeneous mixture. True or False?
True