Atoms
Is located in the nucleus of an atom and determines the isotope of the element?
What is a Neutron?
Balance the following: H₂ + O₂ → H₂O
Answer: 2H₂ + O₂ → 2H₂O
What type of element is a good conductor of electricity and heat?
Answer: Metal
Answer: Metal
What type of bond forms when atoms share electrons?=
Answer: Covalent bond
What type of mixture has the same composition throughout?
Answer: Homogeneous mixture
What is Protons to electrons?
Balance the equation:
N₂ + H₂ → NH₃
Answer: N₂ + 3H₂ → 2NH₃
Elements on the right side of the periodic table are usually what type of elements?
Answer: Nonmetals
What type of compound is formed when a metal bonds with a nonmetal?
Answer: Ionic compound
What is the substance that dissolves in a solution called?
Answer: Solute
An element has an atomic mass of 55.845 amu. If it has an atomic number of 26 how many neutrons does it have?
Answer: 30 Neutrons
Balance the following:
Fe + O₂ → Fe₂O₃
Fe + O₂ → Fe₂O₃
Answer: 4Fe + 3O₂ → 2Fe₂O₃
As I add heat to salt water I can add more salt. By adding heat I increase ....
Answer: the solubility.
Draw the lewis dot structure for NF₃
F-N-F
F
What is the substance that does the dissolving in a solution called?
Answer: Solvent
An atom has 17 protons and 18 electrons. What is the net charge of the ion?
Answer: -1
Balance the equation:
C₃H₈ + O₂ → CO₂ + H₂O
Answer: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
What makes a noble gas like Neon nonreactive?
Its full valence shells does not want to give up or loose electrons. It will not form any bonds because of this.
Why are covalent bonds generally found between nonmetals on the periodic table?
Answer: Nonmetals have similar electronegativities and tend to share electrons rather than transfer them
What type of mixture contains particles that may settle out over time?
Answer: Suspension
Cesium is an alkali earth metal. When it loses its valence shell what charge should it have?
Answer +1
Balance the combustion reaction for butane (C₄H₁₀):
C₄H₁₀ + O₂ → CO₂ + H₂O
Answer:
2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O
Why do ionic compounds usually have high melting points?
Answer: Strong electrostatic attractions between ions require large amounts of energy to break.
Question:
Two elements form a compound where one atom has the electron configuration [Ne]3s²3p⁵ and the other has [Ne]3s². Predict:
which element will lose electrons,
which will gain electrons, and
the chemical formula of the compound formed.
Answer:
The element with [Ne]3s² (magnesium) will lose two electrons.
The element with [Ne]3s²3p⁵ (chlorine) will gain one electron.
Magnesium becomes Mg²⁺ and chlorine becomes Cl⁻.
Two chlorine ions are needed to balance the +2 charge.
Final compound: MgCl₂
Why does salt dissolve in water easily?
Answer: Water molecules are polar and attract the positive and negative ions in salt, pulling them apart into solution.