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What else can I help you with?
Anythin that causes change must have energy. T or F?
True. In order to cause a change, energy must be transferred or transformed in some way.
Is it true that the temperature must drop lower than 0 Celsius for water to freeze when a solute is dissolved in the water?
Yes if something is dissolved in the water then it is no longer pure water and the freezing point will change
What is true about fluctuating water levels?
sign of change
True or false would the volume of water be the same before and after a physical change?
True
Water can change from one state to one state to another true or false?
True. Water can change from a solid state (ice) to a liquid state (water), and from a liquid state to a gaseous state (steam) depending on the temperature and pressure conditions.
To calculate the energy released within a calorimeter the volume temperature change and specific heat capacity of water must be known is this true or false?
True. To calculate the energy released within a calorimeter, you need to know the volume of the substance, the temperature change, and the specific heat capacity of the substance (in this case, water). This information is necessary to apply the formula Q = mcΔT, where Q is the energy, m is the mass, c is the specific heat capacity, and ΔT is the temperature change.
What is true about all physical change that involving a change of state?
They are the same substance, just in a different state. Ex: water>ice>water vapor is still water.
Is it true that in order for water at 60 degrees Fahrenheit to boil it must absorb both sensible and latent heat?
Yes, for water at 60 degrees Fahrenheit to boil, it must first absorb sensible heat to reach its boiling point of 212 degrees Fahrenheit. Then it must absorb latent heat to undergo the phase change from liquid to gas. This process of absorbing both sensible and latent heat is necessary for the water to transition from a liquid state to a gaseous state.
How many Btus are required to change one pound of water at 40F to 200F?
160 btu's. It takes 1 btu (British Thermal Unit) to change the temperature of 1lb of water 1°. This is referred to as sensible heat. This 1 to 1 ratio does not hold true when changing the state of that water to ice or to steam. Changing the state 1lb of water at 212° to 1lb of steam at 212° you must add 970 btu's and to change 1lb of water at 32° into 1lb of ice at 32° you must add 144 btu's. This is referred to as latent heat.
What must be true about the force acting on an object if the motion of the object does not change?
The forces must be balanced; the forces must be equal in size and opposite in direction. (Net force must equal zero).
Dissolved salt in ocean water is an example of a chemical change true or false?
false
What must be true about the average rate of change between any two points on the graph of an increasing function?
if a function is increasing, the average change of rate between any two points must be positive.
