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pick the odd one out: air, sugar syrup, orange juice, salty water
orange juice is heterogeneous!
What is the total number of atoms making up 1 molecule of glucose?
24
What is the name of the compound MgSO4
Magnesium sulfate
How many elements is methane made up of?
2 (CH4)
CaCO3- name this compound
Calcium carbonate
The figure shows: an atom/ molecule of element/molecule of compound?
molecule of compound
True/false, only valence electrons are involved in a chemical reaction.
TRUE
True/False, neutrons can sometimes be positively or negatively charged.
FALSE
True/false, in an atom the number of proton and electrons always has to be equal.
TRUE
An atom has the electronic configuration 2.8. What element is it?
Neon
if aluminium has 13 electrons, what is its electronic configuration?
2.8.3
isotopes have different number of which subatomic particles?
Neutrons
The electronic configuration of this phosphorus atom is?
2.8.5
How many valence electrons does oxygen have?
6
Which element has no neutrons?
Hydrogen
Use your periodic table to find out which atom has 16 neutrons
sulfur
Use your periodic table, to find out which atom has 10 electrons.
Neon
an atom has 9 electrons and 9 protons. using this info, how many neutrons does it have?
cant tell/ dont know!
If an atom has 19 electrons and 20 neutrons, what is its mass number?
39
If an atom has an atomic number of 13, how many electrons does it have?
13
The subatomic particles with negligible mass is the __________
electron
The mass of an atom depends on the ________ and __________
protons and neutrons
The number of protons + neutrons in the atom is called ____________ number
mass/nucleon no
The number of protons in an atom is called the ____________ number
proton/atomic number
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