What are the charges for a proton, neutron, and electron?
Proton= +, Neutron= No charge/Neutral, Electron= -
100
What is the formula for solving density?
Mass / Volume=Density
**remember HEART**
100
What state of matter has the most kinetic energy?
Gas
100
What happens during a chemical change?
composition of the substance changes.
100
In science, an educated guess is called a
hypothesis
200
What makes up the nucleus?
Protons and Neutrons
200
A pure sample of gold has a volume of 25.0 cm3 and a mass of 483 g. What is the density of gold?
19.4 g/cm3
200
Draw:
Make an illustration to show how the particles differ in a solid, liquid, and gas.
:)
200
Compare and contrast exothermic and endothermic
exothermic reactions release energy and endothermic reactions absorb energy
200
Who suggested the "plum pudding" model
J.J. Thomson
300
What makes up a majority of the space in and atom?
Electron cloud/ Empty space
300
Compare the volumes and densities of a 10 g and a 50 g pieces of lead.
The 10 g piece would have a smaller volume but an identical density to the 50 g piece
300
Describe what is happening to an ice cube melting in a glass of water.
solid - liquid. Particles movement increases causing the solid to become a liquid.
300
Provide two examples of an endothermic reaction.
Examples: melting ice cubes, evaporation of water, producing sugar by photosynthesis, cooking an egg, baking bread
300
What did Rutherford propose?
developed the planetary model of the atom which put all the protons in the nucleus and the electrons orbited around the nucleus like planets around the sun.
400
What famous physicist was responsible for introducing the idea of electrons orbiting a positively charges nucleus?
Bohr
400
Corn oil (.93 g/mL), ice (.94g/cm3), water (1.0 g/mL) and ethanol (.79 g/mL) are mixed in the same container. What will be the order of the liquids once they settle out from top to bottom?
Top to bottom= ethanol, corn oil, ice, water
400
Describe the fourth state of matter.
Plasma is a hot ionized gas consisting of approximately equal numbers of positively charged ions and negatively charged electrons.
400
How do we know mass is conserved during physical and chemical changes?
Law of Conservation of Mass
400
What direction does heat travel?
Hot to cold
500
Compare and contrast proton, neutron, and electron in terms of their mass.
Protons and neutrons have nearly the same mass while electrons are much less massive.
500
A 4.86 g piece metal was place in a graduated cylinder containing 15.5 mL of water. The water level rose to 17.3 mL. What is the density of the metal?
2.7 g/mL
500
Explain the three types of heat transfer.
How does heat transfer relate to the states of matter?
Convection- transferred from hot places to cold places
Conduction- transfer of heat between substances that are in direct contact
Radiation- Heat can be transmitted though empty space
Increase or decrease in temperature causes a change in state.
500
Must answer all statements correctly to earn your 500 points! :)
Physical or Chemical?
1. Vinegar will react with baking soda
2. Sugar is capable of dissolving in water
3. Wood is flammable
4. Ammonia is a gas at room temperature
5. Water boils at 100 degrees Celsius
6. Iron rusts in a damp environment
7. Gasoline burns in the presence of oxygen
1. Chemical
2. Physical
3. Chemical
4. Physical
5. Physical
6. Chemical
7. Chemical
500
What is the correct order of the steps in the scientific method?
Ask a question, make a hypothesis, test hypothesis, analyze results, draw conclusions, communicate results.