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science xmas exam
science
| Question | Answer |
|---|---|
| what is a cell | the smallest working unit of a living organism |
| what are the indivual parts of a cell called | they are called cell structures |
| what are the two types of cells | animal cells and plant cells |
| what are the parts of an animal cell | cell membrane Nuclues cytoplasm mitochondria Ribosome |
| what are the parts of a plant cell | cell membrane Nuclues, cytoplasm, mitochondria, Ribosome vacoule, cell wall, chloroplast |
| what is the area of an object | the amount of the object enclosed within its lines |
| what is the volume of an object | the amount of space an object takes up |
| what is accuracy | how close a measured value is to its actual value |
| what is precision | how close together a set of measurments are to each other |
| what is mass | a measurment of how much matter is in a body |
| what is density | the mass of 1cm³ of a substance |
| what is the formula for density | density=mass over volume |
| what is matter | anything that takes up space and has mass |
| what is a melting point | the temperature at which a solid turns into a liquid |
| what is an atom | the smallest particle of an element that still has the properties of that element |
| wht is a subatomic particle | a particle found inside an atom |
| what is an atomic number | the atomic number of an atom is the number of protons in an atom |
| what is a mass number | mass number = number of protons+number of neutrons |
| what is a celestial body | is a naturally made object outside the earts atmosphere |
| what is a satelite | is a objectborbiting a celestail body of large mass |
| what is the formula for speed | speed = distance over time |
| what is displacment | distance in a given direction |
| what is the formula for velocity | velocity=change in displacement over time taken |
| what is accelaration | the change in volocity per second |
| what is the formula per acceleration | acceleration=change in velocity over time taken |
| what colour does acid turn litmus paper | it turns it from blue to red |
| what colour does a base turn litmus paper | it turns it from red to blue |
| what is an indicator | a compound that shows by means of a colour dicatorischangevwhether a substance is acidic or basic |
| what is energy | the ability to do work |
| what is the prinipale of conservation of energy | energy cannot be created or destroyed but can only be changed from one form to another |
| whats the formula for energy effcientcy | energy effciency=useful energy output over energ input×100 over one |
| what is a renewable energy source | a source that will never be used up |
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22cking
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