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Science Test
Chapter 10
| Question | Answer |
|---|---|
| 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
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