Scenario 4:
hope and elizabeth are trying to decide if they should buy a new skateboard or not. they want a skateboard that gives
them the longest jump in the air off a ramp they've built. the new skateboard designer claims to have an aerodynamic
design that allows the longest air time possible when us correctly. hope and elizabeth's old skateboards don't have
this aerodynamic design. they wonder if this if true and decide that hope will buy the new skateboard to try out and
elizabeth will wait to see how it works before she buys one or not.
what is a possible testable question that hope and elizabeth might ask for this scenario? independent variable: dependent variable: hypothesis:

the transfer of heat by electromagnetic radiation is called thermal radiation . it is usually carried out by electromagnetic waves in an energy range just below the visible spectrum, which is the infrared range.

so the answer would be radiation.

: )

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol