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# Science Test

### Chapter 10

How do you find the mass of a substance? Balance
How do you find the volume of a substance? Regular objects = L x W x H and irregular objects = water displacement
How do you find the density of a substance? mass divided by volume
How do you solve for mass? density x volume
How do you solve for volume? mass divided by density
What are units for mass? grams
What are units for volume? cm cubed or mL
What are units for density? g/cm cubed or g/mL
How are the densities of gases different then those of solids and liquids? The densities of gasses are significantly smaller. The gasses we've observed range from ten thousandths to millionths of a gram per cm cuber. The solids and liquids are always mostly over .2 and go up to 21.4 grams per cm cubed.
How do you find the volume of a gas? (based on our experiments) volume of collecting bottle minus the volume of water left in the collecting bottle.
How do you find the mass of a gas? (based of experiments) mass of test tube before minus mass of test tube after.
Give one example of a source of error in experiment 10C If an air bubble formed in the collecting bottle, the volume would falsely increase, therefor the density would be lower.
Give another example of a source of error in experiment 10C If water from the collecting bottle was lost, the volume of gas would falsely increase, so the density would decrease.
Give another example of a source of error in experiment 10C If part of the alka-seltzer tablet was lost after you massed it, the mass would falsely increase, therefore the density would increase.
Give another example of a source of error in experiment 10C If the water spilled when you were finding the volume, the volume would falsely increase, so the density would be lower.
Give another example of a source of error in experiment 10C If the delivery tube was not all the way up in the collecting bottle, the volume would falsely decrease and the density would increase.
Define physical property A characteristic that can be observed directly including color, texture, density, brittleness or phase.
Define chemical property Properties that can only be observed when a substance changes into a different substance.
What are examples of physical properties? Color, texture, density, brittleness or phase.
What are examples of chemical properties? Iron reacts with oxygen to create rust.
What is a physical change? Any change in the size, shape or phase of matter in which the identity of a substance doesn't change.
What is a chemical change? Any change that transforms one substance into a different substance.
What is an example of a physical change? When water freezes.
What is an example of a chemical change? When a iron nail reacts with oxygen and creates rust.
How are molecules in an amorphous solid arranged? Randomly arranged
How are molecules in a crystalline solid arranged? Orderly, repeating arrangement.
What are examples of amorphous solids? Rubber, wax and glass
What are examples of crystalline solids? Salts, minerals and metals.
Define buoyancy The measure of the upward force that a fluid exerts oman object that is submerged.
How is the buoyant force related to the weight of the fluid the object displaces? The buoyant force is the the weight of the water the object displaces. The weight is equal to the mass the object displaces times .0098.
If the buoyant force is greater than the weight of the object, will it float or sink? float
If the buoyant force is less than the weight of the object, will it float or sink? sink
Relate buoyant force to density. Buoyant force and density are both ways to tell if an object sinks or floats. I f the density is less then one gram per cubic cm the object floats and if the buoyant force is less than the weight of the object it floats.
Define viscosity The property of a liquids' resistance to flow.
Explain how the temperature affects the viscosity. The colder the temperature is the higher the viscosity (slower), and the warmer something is, the lower the viscosity (faster).
Created by: brookeguiffre