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