If an atom has six positively charged subatomic particles, which of the following must it also have to become a neutral atom?
The table below shows the properties of four different sample materials. One of these materials is cork, a type of wood that floats on water. (Density of water = 1.00g/cm3) What is the density of cork in g/cm3? Show your work and BOX IN your answer.
Which of the following sequences of elements would all have 4 valence electrons?
Li, Be, B, C
Be, Mg, Ca, Sr
K, Ca, Sc, Ti
C, Si, Ge, Sn
Which of the following elements would react most like strontium (Sr)?
What does the number of valence electrons determine about an element?
the atomic number of the element
the chemical properties of the element
the number of protons in the nucleus
the atomic mass of the element
Which of the following is used to identify an element?
According to the chemical equation (2H2O --> 2H2 + O2), water reacts to produce hydrogen gas and oxygen gas. If 2 molecules of water produce 2 molecules of hydrogen and one molecule of oxygen is the Law of Conservation of Mass conserved in this reaction?
Yes, because the number of atoms of each element on both sided of the equation has not changed
No, the number of molecules must be the same on both sides of the chemical equation
No, this chemical reaction is not possible
Yes, because the mass of the produces is always greater than the mass of the reactants
Phosphorus, a non-metal, would react more similarly to -
Refer to the Periodic Table of Elements attached. WHich of the following groups or families of elements has a complete set of electrons in their outer energy level?
A group of students performed a lab experiment with Powders A, B, and C. They mixed Power A with Powder B in a baggie with a small container of water and recorded their observations in their data table. They performed the same experiment with Powder A and Powder C and recorded their observations.
When Powder A is mixed with Powder B, what is an indication that a chemical change has occured?
Highlight the answer in the table and BOX IN your answer.
Using the key below, draw the model for the following chemical formula:
4Fe + 3O2 --> 2Fe2O3
A laboratory assistant was experimenting with the chemical reactions when she combined a small amount of zinc (Zn) with hydrochloric acid (HCl). She discovered that zinc chloride (ZnCl2) and Hydrogen (H2) were produced.
Which of the following substances are the reactants?
Zn + HCl
ZnCl2 + H2
Zn + H2
ZnCl2 + HCl
The table lists some compounds found in foods and their formulas.
Provide the total number of atoms for each compound.
Draw the Bohr Model for Argon.
T/F: Protons are positive, neutrons are negative, and electrons are neutral.
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