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| Question | Answer |
|---|---|
| What are the steps of the scientific method? | Define the Problem: The question that you are trying to answer 2.Form a Hypothesis: An educated guess to the problem identified 3.Research and Collect Data: Observations and Facts 4.Experiment 5.Conclusion:. |
| What is the difference between an independent and dependent variable? | The independent variable is the controlled variable while the dependent is "dependent" on the independent variable. |
| What is a hypothesis. | An educated guess of how the project will go. |
| What is controlled experiment. | Controlled experiments are experiments where some aspect of the experiment is controlled like the subject, environment, specimen, variable, etc. |
| What I density? What is the formula for density? | 1.the degree of compactness of a substance. Density (ρ) = Mass (m) / Volume (V) |
| What is matter? | 1.physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy. |
| What is the volume of matter and how is it measured differently in solids and liquids? | You can measure the volume of a liquid by pouring it into a container with scale markings.The volume of a solid shape can be calculated by a geometric formula. If the shape is irregular, the volume can be found by displacement of a liquid. |
| What is the difference between matter and mass? | Matter is any substance made of particles with mass. Mass is a property of matter equal to the ratio of the external force applied to the matter to the acceleration imparted by that force. |
| What is the difference between mass and weight? | Mass is a measure of how much matter an object has. Weight is a measure of how strongly gravity pulls on that matter |
| What is inertia? | Inertia is the resistance of any physical object to any change in its state of motion |
| What is a physical property of matter?` | A physical property is any property that is measurable, whose value describes a state of a physical system. |
| How can you tell which liquid has the greatest density? | By putting them in a jar a seeing which one is at the bottom of the jar. |
| What is physical change? | The change in the physical appearance of an object. Gas-liquid. |
| What are chemical properties? | A chemical property can only be observed when undergoing a chemical reaction. Some examples are flammability, rusting reactivity, wood, acid, metal, water, and hydrogen. |
| What are characteristic properties? | A characteristic property is a chemical or physical property that helps identify and classify substances. |
| What are chemical changes. | Chemical changes occur when a substance combines with another to form a new substance, called synthesis or, alternatively, decomposes into two or more different substances. |
| What happens during a chemical change? What are some signs of chemical change? What is precipitate. | During a chemical change, the properties change and a new substance is formed. Temperatures change, colors change or smoke is present, and/or gas/bubbles are released.a substance precipitated from a solution. |
| Is changing state a chemical or physical change? | Physical change. |
| What is reactivity and combustibility? | 1.the state or power of being reactive or the degree to which a thing is reactive. Capable of igniting and burning. These are chemical properties. |
| What are the three main states of matter? What is plasma? | Solids , Liquids, Gas.an ionized gas consisting of positive ions and free electrons in proportions |
| How are particles of matter arranged and moved in the 4 states of matter. | In solids the particles are close together and vibrate in place. In a liquid they are close together but can slide past each other. In a gas the particles are spread out and independent. |
| What are three factors that affect the behavior of gasses? | Temperature, volume, and pressure. |
| What is the difference between Boyle's law and Charles' law? | Boyle's law says that if the pressure of the gas increases the volume will decrease. Charles law says that if the temperature increases so will the volume. |
| What is Gay Lussac's law? | 1.a law stating that the volumes of gases undergoing a reaction at constant pressure and temperature are in a simple ratio to each other and to that of the product. |
| How is energy related to the changes of state of matter? | Since each state of matter has energy you have to remove or gain energy to change the state of the object. |
| What is the melting/freezing point if water? | Ordinarily the freezing point of water is 0° C or 32° F. 0 °C |
| What is the difference between boiling and evaporation? | Boiling is when you increase the temperature and the gas rises in bubbles. Evaporation is when the temperature increases and the water changes to a gas. |
| What is an element? | An element is a pure substance that cannot be separated into simpler substances by physical or chemical means. |
| What are the characteristics of metals, nonmetal, and medallions? | Metals are shiny, and they conduct heat energy and electric current. Nonmetals do not conduct heat or electric current, and solid nonmetals are dull in appearance. Metalloids have properties of both metals and nonmetals. |
| What is a compound and how is it similar/different than elements? | Its similar because it is a pure substance. They are different because its two or more elements. |
| Why are compounds and elements considered pure substances? | They are both considered pure substances because they have one or more elements that are pure. |
| How are compounds broken down into simpler substances? | They can be broken down into chemical changes. |
| What are the properties of mixtures? How can mixtures be separated? | Mixtures are compounds that do not chemically react. Distillation, Magnet, and centrifuge. |
| What is a solution? What is the difference between solute and solvent? | A solution is a mixture that appears to be a single substance. The solute is when the substance is dissolved ,but the solvent is when the solute is dissolved. |
| What is solubility? | The solubility of a solute is the ability of the solute to dissolve in a solvent at a certain temperature. |
| What are 3 ways to make solids dissolve faster in liquids? | Mixing, Heating, and Crushing. |
| What is a suspension? How is it different from a solution? | A suspension is a mixture in which particles of a material are dispersed throughout a liquid or gas but are large enough that they settle out. |
| What is a colloid and how is it similar and different from solution and suspensions? | A colloid is a mixture in which the particles are dispersed throughout but are not heavy enough to settle out. Its similar because they are mixtures. They are different because they appear as different substances. |
| What is the difference between a homogenous and heterogeneous mixture? | One is chemically mixed the other isn't |
| What is motion? | When an object changes position over time relative to a reference point, the object is in motion. |
| What is reference point? | 1.a basis or standard for evaluation, assessment, or comparison; a criterion. |
| What is speed? how is it calculated? | Speed is the distance traveled by an object divided by the time taken to travel that distance. The SI unit for speed is meters per second . Kilometers per hour, feet per second, and miles per hour are other units commonly used to express speed. |
| What is the difference between speed and velocity? What does a distance over time graph show? | Speed is the distance traveled that is calculated while velocity is the speed in a certain direction. |
| What would be positive, negative acceleration look like on a velocity over time graph? | Final velocity - Starting velocity over time it takes to change velocity. |
| Why is moving in a circular motion such as orbit an example of constant acceleration/ | Since the object is always in motion you are acceleration. |
| What is force? What type of force is needed to cause an object to move? | In science, a force is simply a push or a pull. A push or pull. |
| What is the difference between a balanced and unbalanced force? | When both of the forces are 0 the force is balanced. When the net forces are different numbers it is unbalanced. |
| What is net force? | The net force is the combination all of the forces acting on an object. |
| What is friction? | Friction is a force that opposes motion between two surfaces that are in contact. |
| How is friction harmful/helpful? What are some ways to reduce/increase friction? | Friction helps with the breaks. Without friction the car can't stop.One way to reduce friction is to use lubricants.One way to increase friction is to make surfaces rougher |
| What is Gravity? How does it affect matter? | Gravity is a force of attraction between objects that is due to their masses. Gravity is a result of mass. Therefore, all matter is affected by gravity. |
| What is the Universal Law of Gravitation? How does distance affect gravity? How does mass affect gravity? | All objects in the universe attract each other through gravitational force. The size of the force depends on the masses of the objects and the distance between the objects |
| How does gravity affect a falling object? At what rate does an object fall due to gravity on earth? | Gravity pull objects to the ground and the heavier the object the amore gravity pulls it down. Objects fall at the same rate. |
| How does air resistance affect the acceleration of a falling object? What is terminal velocity? | It slows down the acceleration of the object. When an object falls at a certain velocity. |
| What is work? What must happen to do work on an object? How is it calculated? | Work is when a force causes an object to move in the direction of the force. The object would have to be moving in the same direction the force. Work = Force x Distance. |
| What is power? How is it calculated? How can you increase power? | Power is the rate at which energy is transferred. P = W/t. You can use a machine to increase the power. |
| What is a machine? How does a machine make work easier? What is the force / distance trade off? | .A machine is a device that makes work easier by changing the size or direction of a force. By changing the size and direction of a force. |
| What is mechanical advantage? What is mechanical efficiency? Can a machine be 100% efficient? | mechanical advantage is the number of times the machine multiplies force. Mechanical efficiency is a comparison of a machine’s work output with the input. No because every machine lose efficiency because of friction. |
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