mesozoic era - age of the dinosaurs
end of the paleozoic era - most of earth a desert
end of the mesozoic era - a layer of iridium deposited all over earth
Answer:
Answer is in the explanation
Explanation:
All acids that dissociates completely in water are considered strong acids. In the same way, bases that dissociates completely in water are strong bases. All hydroxides made from alkali metals and heavier alkali earth metals are strong bases.
HNO3 dissociates completely in water: STRONG ACID.
HCl dissociates completely in water. STRONG ACID.
NaCl is a salt. Neither a strong acid nor a strong base.
Ca(OH)2. Heavy alkaline earth metal. STRONG BASE.
CH3COOH an acid that doesn't dissociate completely in water. Neither a strong acid nor a strong base.
CH3NH2 is a weak base that doesn't dissociate completely in water. Neither a strong acid nor a strong base.
CH3OH. Methanol is an alcohol. Neither a strong acid nor a strong base.
HF is a weak acid; doesn't dissociate completely in water. Neither a strong acid nor a strong base.
RbOH. Is an hydroxide made from alkali metal. STRONG BASE.
Answer:
the mass of water heated is m water = 18.81 g
Explanation:
Assuming a specific heat of iron of C iron =0.450 J/g°C (from tables) , then if we neglect heat losses to the environment , all the heat absorbed by the water is the one released by the iron ball.
Therefore
heat released= Q = m iron * C iron * (T initial iron - T final ) = 5 g * 0.450 J/g°C ( 200°C - 25°C) = 393.75 J
where
m= mass , T= temperature
then
heat released= heat absorbed =Q = m water * C water * (T final - T initial water)
m water = Q/ [C water * (T final - T initial water)] = 393.75 J/[ 4.186 J/g°C *( 25°C-20°C)] = 18.81 g
m water = 18.81 g