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7th Science Exam
7th Science Exam Mid-Term (Addie)
| Question | Answer |
|---|---|
| Two airplanes are flying at the same speed and have the same mass. Airplane W is flying 50 m higher than Airplane X. Which statement best describes the energy of the two airplanes? | The two airplanes have the same kinetic energy but different gravitational potential energies. |
| As gravitational energy decreases (goes down) the kinetic energy ______________. | goes up |
| Why does the cue ball stop in the game of pool when it hits another ball and that ball moves? | Because of energy transfer. |
| If we have an equal amount of steam, liquid water, and ice, then which one would have the most thermal energy? | Steam because the molecules have the most kinetic energy. |
| Through which type of medium will sound travel through the fastest? | Solid, the particles are extremely close together which means that the sound can easily be transferred between particles |
| What factors determine the amount of chemical energy a substance has? | type of substance and mass |
| When an object emits sound ___________________. | it loses some of its energy to the surroundings. |
| A loud drum noise fades faster than a more mellow sound. | True |
| What is required for electrical energy to be transformed into other types of energy? | A closed conducting circuit with an energy source |
| What is missing from the chemical reaction? 2Mg + O2 = 2Mg | a. 02 |
| What are examples that provide evidence that a chemical reaction took place? | Bubbles, change in smell , temperature change, color change, change in properties (hardness, solubility, density, melt. Pt) |
| Is water boiling and changing into water vapor (a gas) an example of a physical change or chemical change? How do you know? | Physical Change. The properties of the water do not change, it changes its state of matter. |
| What is an example of a change that would form a new substance? | Burning toast |
| During a chemical reaction the atoms rearrange to form new _______________. | substances |
| Give an example of a physical change | A puddle that dries up in the rain |
| A student dissolves 5 grams of salt into 10 grams of water. What is the mass of the salt water? | 15g |
| A substance is made up of _____________ type of material, whereas a mixture is made up of _______________ type of material. | one more than one |
| As an object falls, what happens to its gravitational potential energy? | it decreases |
| Give an example of something that represents energy being converted | Converted: pool balls hitting one another |
| Give an example of something that represents energy NOT being converted | Not Converted: a book sitting on a desk |
| What are the factors that influence the amount of elastic energy in an object? | Compression, Stretching, Hardness |
| How do you find the density of an object? | Mass/Volume (mass divided by volume) |
| What is solubility? If I determine that 10g of salt is not soluble in a large container oil, will 20g of salt be soluble in the same container? Explain. | Solubility is the ability of a substance to dissolve. No, 20g will not dissolve either. Solubility is a property and does not change based upon amount. |
| What can scientist do to help find out whether two liquids are both the same substance? | Smell the liquids to see if they are the same substance |
| What do we know is always true about conservation of matter? List just one. | The mass of a system does not change during a chemical reaction |
| What are two ways to determine the amount of thermal energy of an object? | Mass and Temperature |
| The properties of a substance (use salt as an example) such as hardness, density and melting point will __________________ even if the amount of the substance gets larger or smaller. | stay the same |
| In the chemical reaction below identify the reactants and the products. aluminum + copper chloride à copper + aluminum chloride | Reactants: aluminum + copper chloride Products: copper + aluminum chloride |
| Temperature change (hotter or colder), bubbles (evidence of a gas forming), color change and/or a precipitate (a new solid) are all evidence of a __________________ change. | chemical |
| If two objects are moving at the same speed, but have different masses which one has more kinetic energy? | T he object with the larger mass. |
| If you are holding a pendulum 3 ft off of the ground and then let it swing, what is happening to gravitational and kinetic energy? | Gravitational energy is decreasing and kinetic energy is increasing. |
| If you bounce a basketball on the drive way eventually it comes to a stop? What explains why ball eventually stops? | The ball transfers all of its energy to its surroundings. |
| If the molecules in an object are moving fast and have a a lot of kinetic energy, then what can we conclude about the temperature and thermal energy? | The object has a high temperature and thermal energy. |
| If I place food coloring in two different cups of water (Cup A has hot water and Cup B has cold water) in which cup will the food coloring spread out faster? Why? | Hot water. The molecules move faster in hot water than cold water and therefore collide more with the food coloring and move the food coloring particles around faster. |
| Why does a fully inflated balloon make a louder sound when popped than a partially inflated balloon? | The fully inflated balloon has more elastic energy, therefore, more energy is converted to sound energy. |
| Which type of medium does sound travel through the fastest? Why? | Solid because the particles are very close together. |
| What factors determine the amount of chemical energy in an object? | Type of substance and Mass |
| What is the driving force behind all of our energy on earth? | the sun |
Created by:
chrisruiter