8099988
Descripción
Test por Oscar Patterson, actualizado hace más de 1 año
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Creado por Oscar Patterson
hace más de 7 años
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Pregunta 1
Pregunta
does Exothermic reactions give out more energy when new bonds are made
Respuesta
- True
- False
Pregunta 2
Pregunta
How many electrons can go in each of the shells around the nucleus?
Respuesta
-
2 in first shell and 8 in the next energy levels
-
7 in the first shell and 10 in the next energy levels
-
does not matter
Pregunta 3
Pregunta
what is the atomic number
Respuesta
-
number of protons + number of neutrons
-
number of protons
-
number of neutrons
Pregunta 4
Pregunta
An ion is an atom or a group of atoms with a [blank_start]positive[blank_end] charge or a [blank_start]negative[blank_end] charge.
Respuesta
-
positive
-
negative
-
neutral
-
negative
-
positive
-
neutral
Pregunta 5
Pregunta
In endothermic reactions more energy is needed to break bonds of reactions
Respuesta
- True
- False
Pregunta 6
Pregunta
Sodium gives a [blank_start]yellow/orange[blank_end] flame, potassium gives a [blank_start]lilac[blank_end] flame, calcium gives a [blank_start]brick-red[blank_end] flame and copper gives a [blank_start]blue-green[blank_end] flame.
Respuesta
-
yellow/orange
-
lilac
-
brick-red
-
blue-green
-
lilac
-
yellow/orange
-
brick-red
-
blue-green
-
brick-red
-
yellow/orange
-
lilac
-
blue-green
-
blue-green
-
yellow/orange
-
lilac
-
brick-red
Pregunta 7
Pregunta
Why is barium sulfate safe to drink?
Respuesta
-
because its insoluble. ( can't enter the bloodstream)
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because it is opaque
Pregunta 8
Pregunta
why can simple molecular covalent substances not conduct electricity?
Respuesta
-
because they have no ions
-
they have weak forces between bonds
-
they have small molecules
Pregunta 9
Pregunta
Ionic bonds form when a metal reacts with a non-metal
Respuesta
- True
- False
Pregunta 10
Pregunta
covalent bonds form between atoms of non - metal elements
Respuesta
- True
- False
Pregunta 11
Pregunta
protons relative mass is [blank_start]1[blank_end], neutrons relative masses [blank_start]1[blank_end] and electrons relative mass is [blank_start]-1[blank_end]
Respuesta
-
1
-
+1
-
1
-
0
-
-1
-
-1
-
1
-
0
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