Scheda di esercizi di Chimica per i test di ammissione a infermieristica con soluzioni

Che cos'è una reazione esotermica?

1. AUna reazione che libera calore nell'ambiente circostante
2. BUna reazione in cui non cambia affatto l'energia
3. CUna reazione che ha bisogno di luce per iniziare
4. DUna reazione che assorbe calore dall'ambiente circostante

A cleaning solution has a pH of 12. How is it described?

1. AWeakly acidic
2. BStrongly basic
3. CNeutral
4. DStrongly acidic

Which property is typical of nonmetals?

1. AThey easily lose electrons to form positive ions
2. BThey are poor conductors of heat and electricity
3. CThey are all solids at room temperature
4. DThey are shiny and easily bent into wires

Come si confronta una soluzione con pH 3 con una a pH 5?

1. AHa 2 volte più ioni idrogeno
2. BHa lo stesso numero di ioni idrogeno
3. CHa 100 volte più ioni idrogeno
4. DHa 100 volte meno ioni idrogeno

How many oxygen atoms are in one formula unit of calcium nitrate, Ca(NO₃)₂?

1. A5
2. B6
3. C2
4. D3

What colour is phenolphthalein indicator in a basic solution?

1. APink
2. BColourless
3. CBlue
4. DYellow

The true volume in a flask is 10,0 mL. A student measures it three times and gets 8,1 mL, 8,1 mL and 8,2 mL. How are these results best described?

1. AAccurate but not precise
2. BNeither accurate nor precise
3. CPrecise but not accurate
4. DBoth accurate and precise

Equal masses of sand and water sit in the sun and absorb the same amount of heat. Which warms up more, and why?

1. AWater, because it has a higher specific heat capacity than sand
2. BSand, because it has a higher specific heat capacity than water
3. CSand, because it has a lower specific heat capacity than water
4. DBoth warm equally, because they absorbed the same heat