Did water condense on a can of juice that was removed from the refrigerator? Is this a physical change or chemical change?

2. Did you eat toast for breakfast? Is this a physical change or a chemical change?

3. Observe a dull penny and shiny penny. Copper plus oxygen react together to form copper oxide. Is this a chemical change or a physical change?

4. Did someone roast coffee beans in your home today? Is this a chemical or physical change?

5.Imagine if I defrosted mixed vegetables from the freezer. Is this a chemical or physical change?

My answers

Explanation:

1) Did water condense on a can of juice that was removed from the refrigerator - chemical change

2) Did you eat toast for breakfast - chemical change

3) physical change

4) physical change

5) physical change

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.

the answer is 1260

you spend 7 hours in school for 1 school day with 5 school days in 1 school week with 36 school weeks in a school year.

7*5*36= 1260 it's all about multiplying