coverage inspire science review grade 7

refuting for grade 7 science and inspired exam coverage term 2. number one which statement is true about solid particles the particles are less likely but and can move around each other the particles are close to each other and difficult to compress or the particles are far apart and can move around freely or the particles are farbered and separate in their place with the answer one two three the particles are close to each other and difficult to compress true or false the state of matter without definite shape or definite volume is gas false or true answer is true which of these particles can flow between containers or or or the answer answer and is liquid and is gas can flow between the container which of the three states of matter has more potential energy potential energy means the distance between particles if there is the more distance or long distance that means more potential energy liquid particles because they are further apart from one other than gas or liquid vertical skills they are close together gas particles because they are closer to each other or gas particles because they are further apart from one other answer is the gas particles because they are further apart from one other chemical anal potential energy particles which of these mothers have more thermal energy but top full of water at 25 Celsius or class of water at 25 Celsius or frozen water class of water at 15 Celsius what the answer the answer is the bathtub full of water at 25 Celsius why because here 25 and 25 the thermal energy depends on the temperature but the same temperature here but the bathtub and here class here amount of water is more here more than class foreign yeah how many atoms of oxygen are there in chemical formulas CO2 the answer is two yes because there is 2 here subscript next to but how many atoms for for the carbon one but without writing one next to carbon the compound that represents the model is this model what the answer hno2 H2O2 or NH3 you can see the circle blue circle and this big and the small and this big red circle this is nitrogen hydrogen oxygen the answer is NH3 this ammonia here and nitrogen and there are three atoms hydrogen Atkins what happens to the volume of gas when thermal energy increase no change or decrease or increase you can answer in crease because the thermal energy what means Eternal energy movement and the distance between the particles when these are increasing the volume of gas and also increase also increase what's the energy an object has to do to its motion temperature potential energy or kinetic energy the answer is kinetic energy if the kinetic energy increases that means the temperature decreases or motion of particles increases or the thermal energy doesn't change the answer is motion of particles increases there are water in the liquid state and the same mass of solid bus Buster and the input are boiling which of them has more thermal energy not one of them salt pasta water due to the seeds thermal energy depends on the states yes water due to the state because it's liquid but the solid can't move can't move so that the thermal energy in the water is moving when we heat under the flask we notice the balloon with any flat because the particle collisions decreases or thermal in energy of gas increases the kinetic energy decreases but the answer you can see this picture or this model this is flask full of gas this balloon you and you can notice the wall and flat when heat under the flask the answer thermal energy of gas the increases because the particles move away from each other and then then balloon and flat and take more volume an increase in volume as the temperature increases is called thermal expansion thermal contraction or thermal energy but the answer answer is thermal expansion what do you think will happen if the boy puts the pole in the refrigerator the Pole's volume will increase number two the pulse mass will decrease all the pulse volume will decrease but the answer here the temperature answer the pulse volume will decrease because they've been the temperature in the refrigerator is low so that the particles close from each other so that volume will decrease why when thermal expansions use the balloon gets bigger because the number of particles will increase or because the particles will push out or the inside surface of balloon or because the size of the parts will increase with the answer is because the verticals will push out in the inside surface of the balance or gets bigger what is the melting point the temperature at which solar changes to liquid or the temperature at which liquid changes to solid the temperature at which gap changes to liquid what is that melting point like ice cream is melting the temperature at which solid two changes to liquid yes that's right what will happen if the particles in the in the solid state is speed up and they are moved further apart and the attractive force will break so it will be liquid or attractive force will break so it will be the same or nothing will happen what happened here the answer is the attractive force will break so it will be liquid what's the meaning particles when an ice melts do we add or remove thermal energy we remove thermal energy or we add terminal energy or we don't do any changes with thermal energy melting needs add thermal energy what is advertisation is change of state from gas to liquid or is the change of state from liquid to gas or exchange of state from solid to liquid the answer is change of States from liquid to gas is that particles will move faster when vibration happen it will move and move faster because it has more kinetic energy it will move faster because it has less kinetic energy or it will move slower because there is no thermal energy when vibrilization what happened it will move faster the particles move faster because it has more kinetic energy what does assistance reach its boiling point boiling point means here temperature when solid particles have enough energy to overcome the attractive force or when liquid particles have enough energy to overcome the attractive force or when gas becomes liquid and the boiling point the answer when liquid particles have enough energy to overcome the attractive Force the maximum temperature of evaporation that means boiling point melting point freezing point the answer is boiling point there is difference between meaning between boiling and evaporation what the meaning evaporation evaporation cures at any temperature but the boiling point when the particles cure occurs in pointing bone in this temperature is during change of state the temperature might increase or decrease doesn't change increase what happened doesn't change is from solid to liquid or liquid to gas or gas to liquid or liquid to solid during the changing of State doesn't change in the temperature what is the opposite of melting freezing evaporation condensation melting means and change the state of of the matter from solid to liquid with the opposite of this melting freezing yes because the freezing change the matter from the liquid to solid evaporation from liquid to gas condensation from gas to to liquid what is the freezing change state from liquid to solid or change state from gas to liquid or change state from solid to liquid which is the answer which one change state from liquid to solid what will happen if we remove thermal energy from gas it will stay the same it will condense and salt will form as well condensed and liquid will form with answer yes as well condensed and liquid is well formed from gas to liquid this is condensation what is condensation change from gas to liquid change from solid to liquid or change from liquid to solid answer is change from gas to liquid what does the boils lost it states that the pressure of gas decrease of the volume decreases state that the pressure of gas increase if the volume decreases state that the volume of gas decreases of if the temperature decreases the relationship and the oil's low between pressure and the volume and the relationship is the opposite way the opposite way where is the opposite way here answer the pressure of gas increase of their volume decreases this is opposite increase and decrease between pressure and volume this diagram about the pressure causes in change in and can be changed by it causes change this is of particles solid liquid and particles as we know liquidity particles colleges of the particles of the particles number of the particles what is the relationship between pressure and volume and boils low inversely professional relationship professional relationship no one of them increase the volume decrease pressure decrease the volume increase which of the graphs is the correct according to oils low look at the this graph pressure and volume pressure and volume here inversely proportional here not inversely here and the street not inversely the answer is the first one there is opposite way the change is in opposite way between pressure and volume which statement is it true about hydrogen fluoride this is compound hydrogen fluoride this is fluoride hydrogen ionic compound covalent compound element what about what is the correct the equivalent compound how we know because there is hydrogen and here plus ionic foreign formed from non-vital elements have extended structures formed from opposite churches the answer is foreign non-metal elements that's not true the ionic compound formed from non-lethal and Metal what type of substance does the picture show need compounded covalid compound extended structure the covalent compound which are following compounds are good conductors of electricity with dissolved covalent compounds not one of them ionic compounds the answer is ionic compounds the substances are solid with adult appearance it doesn't conduct electricity but it will dissolve in water and will hit with hammer it shelters into pieces which structure would you predict this substance to have the answer is molecules the don't conduct is separated what is the mass amount of matter or particles in absurdistance the amount of space substance takes up the mass per unit volume of substance the mass is amount of metal or particles in substance which of these balances is terrible pin balance which one the second one what is the weight the pull of gravity on matter the amount of space substance take up takes up ability of matter to burn but the answer the way is the pile of gravity on matter does the mass change by changing the location yes no it is the weight that changes no it's the volume that changes what the answer is volume quantitative property yes because we can measure it yes because we can observe it not because we cannot measure it what's the answer for this question yes because becomes your airplane and quantitative what is the unit for volume later milliliter centimeter Cube kilogram geometry height and Celsius what the answer letter milliliter centimeter Cube how can we measure regularly shaped object displacement graduated cylinders dimensions for the answer displacement because irregular shape when the neurons change its color from Silver to Brown orange that is example for oxidation flammability reaction to acid answer is oxidation when does oxidation occur when substance reacts with with an exciting agent Like Oxygen and bleach when substance reacts with an oxidizing agent like Silicon when substance reacts with an oxidation oxidizing agents like hydrogen the answer when substance reacts with an oxidizing agent Like Oxygen and the bleach like chlorine and the fluorine can physical or chemical properties be used to identify substance no we can use only chemical properties now we can't use any one of them yes we can use both of them to identify substance the answer is yes we can use both of them chemical physical properties to identify substance what is this probability chemical properties limitability chemical property oxidation physical property inflamability chemical properties flammability what is this property physical property solubility chemical properties reliability or reactivity answer is physical and solubility in closed system the mass of the substances before chemical change equals the mass of the new substances after the change what is this low law of the conservation of mass law of the conservation of energy law of the conservation of matter what is the slope law of conservation of mass calculate the mass of the substance 3 as product 300.23 gram 333 gram 150 gram as we see here the products here the product but in the equivalence 300.23 gram to to reactants reactions this flask and this tube so that 2 and 1 equals three hundred Point twenty three before reacts reaction Q4 reaction equal after reaction so that that the mass of substance 3 equals 300.23 Diamond Head here Canon have the Alcott about it foreign which of the following is balanced chemical equation chemical equation reactant and this products how many one atom here how many carbon one carbon isn't equal the another type actually hydrogen how many hydrogen here in the reactant four here how many hydrogen foreign chemical equation number two is nam foreign how does the chemical equation show the law of the conservation of mass balanced chemical equation permits each side of the equation to have the same number of each type of atom the mass of each type of element change during chemical reaction but the sum Remains the Same the mass of the reactants must equal the mass of the products even of the type of elements are different one the first one because number of the atoms choose the correct answer 2C Plus or two two here in the blue color is coefficient subsequent number of the electrons what's the mean this two that means coefficient way added the number of atoms how many time the surrounding space in exothermic reaction get colder get warmer stay the same get warmer what's the meaning exothermic exothermic and the endothermic isothermic endothermic an endothermic reactions thus the breaking of the chemical bonds require more energy than is released when the products are formed no it needs more yes no it takes the same amount answer in determine yes that means endothermic reactions require more energy if in the reactant will be there because combustion is an indetermining reaction or exothermic reaction or in exothermic physical change what's the meaning exothermic reactions exothermic reactions which of following compounds is made of three atoms and it is three CO2 CH4 you must count how many atoms and one atoms H3 3 plus 1 4 and then this is not correct CO2 see how many atom one atom all two atoms two plus one three this is correct CO2 backyard containing an unknown substance was boiling at 78 celsius at temperature higher than 78 celsius it will be that liquid liquid and gas what is happen what happened in boiling from liquid to gas which statement is it true about chemical change atoms rearrange and form new Bond and new substance same atoms change their properties to form new products and new atoms are created in the reaction to forming new products what is it true atoms rearrange and form newer Bond and new substance where do the reactants are written in chemical equations on the left on the right in the middle reactant in the left if their products are not equal to the reactants in the chemical equations what do we put to make the products equal to reactants subsequent coefficient new substance coefficient we had rock of LED reactants what is ours are deposits of oil that are large enough to be drilled for profit or natural resources that are being used are faster than they can be replaced by natural process processes or the deficits of minerals that are large enough to be mined for Prophets the answer is deposit of minerals not only oil here not only oil of minerals what are the uses of the land resources people use land resources to grow food and to live on the Land There is no uses people use land resources for grazing animals there are two answers the first and the third what is the groundwater overdraft the middle of waters ability to follow through sediments and rocks our amount of poor space in material or community the process where groundwater is removed from an underground water source faster than it can be replaced is what happens if we over bump groundwater over bumps the amounts of fresh water will increase salt water will mix with fresh water or fresh water will be healthier and the answer is salt water will mix with fresh water the energy is not created and energy is not destroyed that low that law of conservation of energy conservation of mass natural that is conservation of energy what type is photosynthesis reaction exothermic reaction or endothermic reaction answer is endothermic reactions absorbs foreign vinegar into cup and recorded the initial temperature of vinegar as 25 Celsius then she added baking soda and dissolved and purples do form she noticed that temperature wall changes to 14 degrees what time is this reaction exothermic reaction or endothermic reaction the answer is endothermic reaction because the temperature change from 25 to 14. endothermic