Unit 7.3 and important questions 7.2

• Scheikunde
• Middelbare school
• havo
• Leerjaar 3

How do I recognize a molecular substance?

1. Formula contains kinds of atoms of metals and non-metals
2. Formula contains kinds of atoms of non-metals
3. All oxides are a molecular substance
4. By holding a magnete near the substance

Molecular substances cannot conduct electricity. How come?

1. You're testing the wrong state of substance
2. They consist of molecules
3. They consist of uncharged particles
4. They need water to be able to conduct electricity.

Which substance has the strongest Van der Waals bonding?

1. left
2. middle
3. right
4. I don't know

What is an atomic bond?

1. The line between atoms
2. a shared pair of elektrons
3. Atoms bonded together
4. covalence

Look in the periodic table: What is the covalence of nitrogen?

1. 1
2. 2
3. 3
4. 4

Look in the periodic table: What is the covalence of sulfur?

1. 1
2. 2
3. 3
4. 4

Question 7a: What is the name of a mixture of metals?

1. Alley
2. Alloy
3. Aloi
4. Alloj

Question 7b: What is the composition of duralumin?

1. alloy of cupper and magnesium
2. alloy of cupper and calcium
3. alloy of cupper and aluminium
4. alloy of cupper and cadmium

Question 7c: Explain whether pans of duralumin can be used for induction cooking?

1. Yes, you can, these pans are very sustainable
2. Yes, the melting range is very high
3. No, the pan will melt
4. No, aluminium isn't magnetic

Question 9

1. metallic lattice of cupper will contain the smaller Sn atoms
2. metallic lattice of cupper will contain the larger Sn atoms
3. metallic lattice of bronze will contain the smaller Sn atoms
4. metallic lattice of bronze will contain the larger Sn atoms

Question 10a

Question 10b

Question 12a: atomic number of Zinc

1. 65
2. 18
3. 30
4. 20

Question 12a: the group in the periodic table of Silver

1. 10
2. 11
3. 12
4. 13

Question 12c

1. A
2. B
3. C
4. D

Question 12d: which of these is a property of matter?

1. Mass
2. 11m high and volume of 24m3
3. calciumsulfaatdihydraat
4. density

Question 13: Difference at micro level of mixture of two metal powders and an alloy of these two metals

1. In a mixture of metal powders the atoms are mixed
2. In an alloy the metals are mixed evenly
3. In an alloy the metals are mixed at atomic level
4. A mixture of metal powders demixes

Question 14

1. (45*12.3)/100=5.5
2. (100/12.3)/45=0.18
3. (12.3/45)*100=27.3
4. 45/12.3=3.7

Question 15a

1. Below 97.5
2. Above 97.5
3. Between 97.5 and 883
4. Above 883

Question 15b

1. Foam
2. water
3. sand
4. fire blanket

Question 15c

1. combustion
2. decomposition
3. separation method
4. acid-base

Question 15d

1. Formation of hydrogen gas
2. Sodium explodes
3. Water evaporates and transports the fire
4. The water transports the sodium