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

Come si chiama una colonna verticale della tavola periodica?

1. AUna serie
2. BUn periodo
3. CUn guscio
4. DUn gruppo

About what percentage of dry air is oxygen?

1. A21%
2. B1%
3. C78%
4. D50%

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

1. AStrongly acidic
2. BStrongly basic
3. CNeutral
4. DWeakly acidic

Why do group 1 metals such as sodium react so easily?

1. AThey easily gain one extra electron
2. BThey have a full outer shell of electrons
3. CThey have one outer electron that is easily lost
4. DTheir nuclei contain no neutrons

Which of these is a colloid?

1. APure water
2. BMilk
3. CSalt water
4. DSand in water

Glucose has the molecular formula C₆H₁₂O₆. What is its empirical formula?

1. AC₂H₄O₂
2. BCH₂O
3. CCHO
4. DC₆H₁₂O₆

Many ethene (C₂H₄) molecules join together to form poly(ethene), a plastic. What type of reaction is this?

1. ACombustion, in which ethene reacts with oxygen
2. BAddition polymerisation, in which the C=C double bonds open up to link the monomers
3. CCondensation polymerisation, in which a water molecule is released at each new link
4. DHydrolysis, in which water breaks each monomer apart

100 mL of 1 M NaCl is mixed with 100 mL of 3 M NaCl. What is the concentration of the mixture?

1. A1,5 M
2. B3 M
3. C4 M
4. D2 M