1
Orange juice without straining is an example of
a) Heterogeneous mixture
b) Homogeneous mixture
a) Heterogeneous mixture
15 g of NaCl was dissolved in 225 g of water. Which is the solute?
NaCl
Which is the universal solvent for solutions?
water
Which is the difference between a covalent and ionic bond?
65.38
Explain the structure of an atom
Protons
Neutrons
Electrons
Orbitals
TRUE
FALSE
FALSE
a) the total electrons of an element
b) the valence electrons
b) the valence electrons
Mention 2 characteristics of covalent bonds?
They share electrons
They are created between 2 nonmetals
Explain what a neutral charge is
Equal number of electrons and protons.
When all the charges are balanced out.
A sample of river water is a
a) homogeneous mixture
b) heterogeneous mixture
b) heterogeneous mixture
The periods represent the
Number of orbitals of each element
The groups represent the
Number of valence electrons
What is an ion?
Atom with negative or positive charge due to the gain or loss of electron.
Which is the preparation method used when preparing tea?
a) Decantation
b) Filtration
c) Extraction
b) Filtration
15 g of NaCl was dissolved in 225 g of water. Which is the total solution?
240 grams
Scientist who proposed that electrons are situated in different levels or shells
BOHR
What happens when an atom looses an electron?
It gains a positive charge
What happens when an atom receive an electron?
It gains a negative charge
Which separation method is used in wastewater treatment plants?
a) Decantation
b) Chromatography
c) Distillation
d) Filtration
DECANATION
25 ml of methanol are mixed 150 ml of ethanol. Which is the solvent?
Ethanol
Most of the times the SOLVENT is in higher concentration than the SOLUTE
true
false
TRUE
Which is the difference between sharing and transferring electrons?
Transferring is when the owner gives aways and it no longers belongs to it. Sharing both elements are using the same electron.
What is electrostatic attraction?
Attraction produced by different charges.