Use blue litmus paper. This is an indicator that can safely determine whether it is a base or an acid by changing color in response to the substance. This color indicates whether it is an acid or a base. Refer to the pH scale to see if the substance is basic or acidic.
Answer:
two may be the answer (2)
Answer:209.53
Explanation:
Molar concentration=moles/Volume. Volume is given as 750mL which can be converted as 0.75l,so moles of CuBr2 is molar concentration ×Volume= 1.25×0.75=0.9375
Mole =mass of CuBr2/molecular Mass of CuBr2.
Molecular Mass of CuBr2 is 63.5+80×2=223.5(mass number of Cu=63.5 and Br=80).
So mass required= 223.5×0.9375=209.53g
At high altitudes, air pressure is lower. That means that the boiling point of water is lower as well (lower air pressure means that water molecules need less energy to turn into gas), and because the water is boiling at a lower temperature it takes longer for it to cook the pasta.
hope this helps!
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Is it multiple choice? If not, the main reason would be the ability to escape from prey, or move to a different climate based on the individual needs.
