The smallest particle or piece of a pure substance.
Is this a physical or a chemical change? freezing point
physical change
What is the formula for copper(I) sulfate?
Cu2SO4
According to the octet rule most elements need _______ valence electrons.
8
What is krypton? Element, Compound, Mixture
Element
I have an object that is dull, brittle, and an insulator, what is it?
Nonmetal
Mention an element which is similar to Li
Na, K, Ru, Cs, Fr
Identify the element in Period 5 that has 1 valence electron?
Ru
Is this a physical or a chemical change? corrosion of a bicycle frame
chemical change
The weaker the intermolecular forces of a substance the _____________ the boiling point
Lower
How many electrons can the d sublevel hold?
10
In which mixture can you see all of the parts?
heterogeneous
When a nonmetal gains electrons, it becomes this type of ion.
Anion
What region of the periodic table contains atoms that form covalent bonds?
the right side
A salad is an example of a __________.
heterogeneous mixture
The proper formula for magnesium hydroxide:
Mg(OH)2
How are covalent bonds explained?
When the atom shares an electron with an another atom
Students in Mrs. Clark's science class are investigating a substance that has the following properties -shiny -bends easily -hard, not easily broken Based on these properties how would you classify the substance?
metal
What is the chemical symbol for Titanium
Ti
In which mixture can you not see all of the parts?
homogeneous
The name of FeCl₂ is
Iron (II) chloride
What atom matches this electron configuration? 1s^2 2s^2 2p^6 3s^2
Magnesium
What atom matches this electron configuration? [Xe] 6s^2 4f^14 5d^9
Gold
What is a mixture?
a combination of different things
Which element is the least reactive? Li, B, C, or Ne
Ne
Are the atoms more stable when they are bonded together or when they are apart?
Bonded Together
What is the correct formula for Sodium Oxide?
Na2O
What is a Compound?
Two or more elements combined; more than one capital letter.
What is the name of the compound Na2(SO4)?
Sodium sulfate
Mention a property of metals
solid, malleable, ductile, high boiling andmelting point
When metals bond with non-metals they form what type of bonds
Ionic
When two nonmetals do not share electrons evenly, the resulting covalent bond will be
Polar
What is this element? 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6
krypton
What two types of atoms make a covalent bond?
2 nonmetals
What element in Period 4 has 5 valence electrons?
As
Is this a physical or a chemical property? a change of one substance to another
chemical change
Is this a physical or a chemical change? sharpening a pencil
physical change
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