LICEO GUERNIKA 4Version en ligne SCIENCE4.4 par Liliana Meneses León 1 What`s the name of our galaxy? a Big dipper b Cosmos c Cassiopeia d Milky way 2 What´s the biggest planet in the solar system? a Saturn b Jupiter c Uranus d Neptune 3 What`s the smallest planet in the solar system? a Venus b Saturn c Mercury d Earth 4 what is a star? a a hard and rocky body b a big ball of hot gasses c a small body of ice gas d a very big planet 5 What´s an asteroid? a a hard and rocky body b A small planet c A big planet d A big ball of cold gasses 6 What´s the theory scientists say explain better the begin of the universe? a The Crash pump theory b The Bible theory c The Big Bang theory d The solar system theory 7 What are comets? a a hard and rocky body b A mixture of ice, gas and dust small bodies c A mixture of rocks and hot gasses small bodies d Comets are parts of planets 8 The path travelled by an object moving around another one much bigger. a Orbil b Milky way c Earth d Galaxy 9 The scientist who posed the Heliocentric theory. a Nicolas Copernicus b Albert Einstein c Leonardo DaVinci d Dios 10 A mixture is a substance made by combining two or more different materials in such a way that no chemical reaction occurs. A mixture can usually be separated back into its original components. a True b False 11 A chemical solution contains very small particle sizes (less than 1 nanometer in diameter). A solution is physically stable and the components cannot be separated by decanting or centrifuging the sample. Examples of solutions include air (gas), dissolved oxygen in water (liquid), and mercury in gold amalgam (solid), opal (solid), and gelatin (solid). a True b False 12 A colloidal solution appears homogeneous to the naked eye, but particles are apparent under microscope magnification. Particle sizes range from 1 nanometer to 1 micrometer. Like solutions, colloids are physically stable. They exhibit the Tyndall effect. Colloid components can't be separated using decantation, but may be isolated by centrifugation. Examples of colloids include hair spray (gas), smoke (gas), whipped cream (liquid foam), blood (liquid) a True b False 13 Particles in a suspension are often large enough that the mixture appears heterogeneous. Stabilizing agents are required to keep the particles from separating. Like colloids, suspensions exhibit the Tyndall effect. Suspensions may be separated using either decantation or centrifugation. Examples of suspensions include dust in air (solid in gas), vinaigrette (liquid in liquid), mud (solid in liquid), sand (solids blended together), and granite (blended solids). a True b False 14 The fruit salad is a mixture homogeneous or heterogeneous? a homogeneous b heterogeneous 15 The chocolate and orange juice are a mixture homogeneous or heterogeneous? a homogeneous b heterogeneous 16 Takes up space a Matter b Heterogeneous c Homogeneous d Solution 17 Two or more dissolved solutions a Solution b Heterogeneous c Homogeneous d Matter 18 A partial mixture a Solution b Matter c Heterogeneous d Homogeneous 19 Fully combined a Matter b Homogeneous c Heterogeneous d Solution 20 The homogeneous mixture are a solutions and colloids b suspention and colloid c solutions and mixed d mixed and suspention 21 The heterogeneous mixture is a solutions b colloids c suspension d mixed 22 A mixture in which the composition is uniform throughout the mixture is a homogeneous b mixture c substance 23 _______consists of multiple substances put together. a homogeneous b mixture c substance 24 ______________it has a uniform and definite composition. a homogeneous b mixture c substance 25 Do you remember the name of the Colombian scientist expert in spiders? a Manuel Elkin Patarroyo b Darío Gutiérrez c Rodolfo Llinas d Jairo Anibal Niño
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