CHEMISTRY- exam (old test questions)
se, na,na, ar, o
From the Group 6A elements shown in the diagram, the element with the largest atomic radius is ------ . In Period 3, the element with the largest atomic radius is ------- . The three atoms that would form ions that are smaller in size than their parent atoms are Al, Mg, and ------- . In Period 3, ------ has the highest ionization energy, while in Group 6A has the highest ionization energy.
ar, cl, o
Which of the elements have atomic radii smaller than S? Select all that apply.
calcium, group
Another element that may show a similar chemical reaction with oxygen as the element used in the classroom experiment is ------- . Evidence of similar chemical properties is shown by elements present in the same ------ of the periodic table.
Cs Rb K Na Li
Arrange the following atoms, top to bottom, in the correct order of increasing ionization energy, starting with the lowest.
Te Sb In Sr Rb
Arrange the following elements, from top to bottom, in the correct order of increasing atomic radius starting with the smallest.
As ,5
Based on an understanding of the way elements are arranged in the periodic table, it is likely that the element -------has ----- valence electrons like nitrogen.
Atom X = 1; Atom Y = 7
Based on the electron configuration of each atom, what is the number of valence electrons for each atom?
Cs
Based on the periodic table, which other element is likely to share common properties with sodium, or Na?
the ability of valence electrons to flow freely.
Characteristic properties of metals, such as malleability and high conductivity, are due to
Element: Ne,Li,H Molecule: CO2,N2,CaO
Classify each of the items as either an element or a molecule by dragging each one into the correct box.
na, cs
Compare the atomic radii of Na, K, Rb, and Cs based on their relative positions on the periodic table. Of the four elemental symbols, -------- has the smallest radius and ------- has the largest radius.
1 ,2
Copper is a metal and has a Cu2+ ion that reacts with a nonmetal, bromine, which has an ion of Br-. Predict the ratio of copper to bromine in an ionic compound assuming the ions bond in the reaction. copper: ---- bromine:----
Anions; nitrogen, oxygen Cations: calcium, potassium
Determine which type of ion each element is most likely to form. Place each element in the corresponding category as an anion or a cation. potassium added to Cations
nitric oxide , carbon monoxide, gaseous, solid
Oxygen reacts with many different elements to form different molecules. As the energy of matter changes, substances experience changes in their states of matter. Choose the correct terms to finish the sentences. ------ and -------- have the greatest kinetic energy. Compounds in the ------- state have the greatest kinetic energy because their particles are moving the fastest. Compounds in the ------ will have the lowest thermal energy.
protons, neutrons
Oxygen-16, oxygen-17, and oxygen-18 are the three isotopes of the element oxygen. An atom of each of these isotopes will have the same number of -------, but a different number of ------- .
IV, III,II,I
Rearrange the liquids in the order of increasing intermolecular forces. Place the liquid with the weakest intermolecular forces at the top and the liquid with the strongest intermolecular forces at the bottom.
As
Use the periodic table to answer the question. Which of the following elements has the same number of electrons in the outer shell and similar chemical characteristics as the atom shown?
Atoms emit light as excited electrons drop down to lower energy levels.
What causes the unique atomic spectra produced for each element?
B. Ca(NO3)2
What is the formula for the compound calcium nitrate that forms when calcium ions react with the nitrate ions?
D. tetraphosphorus decaoxide
What is the name of the compound P4O10 that forms when elemental phosphorus is exposed to oxygen?
copper
Which of the elements shown makes up the unknown spectrum?
8 dots per cl and 2+ charge of Ca
Which of the following Lewis structures correctly represents CaCl2?
F
Which of the following elements behaves the most like the team pulling the hardest in the Figure C tug-of-war game? Li, Be, B, N, O, F
BeS, MgF2
Which of the following formulas represent an ionic compounds that can be made from these six elements: Al, Be, F, Mg, Li, and S?
they have four valence electrons
Which of the following is a characteristic of the Group 14 elements?
sulfur and fluorine
Which of the following pair of elements is most likely to form a molecular compound?
thermal conductivity
Which of the following properties of copper metal explain the rise in temperature of the water in beaker B?
12C, 14C
Which of the following represents a pair of isotopes?
ionic
Which of the following represents the type of bonding in copper oxide?
Nh
Which of the four elements is most likely to form cations in its reactions?
sodium fluoride (NaF)
Which of the substances can be best characterized as having a high melting point and the ability to conduct electricity in a molten state?
A. increasing number of protons B. similarity in the number of their valence electrons C. similarity in their physical and chemical properties
Which pattern(s) may be observed from the arrangement of elements in the periodic table? Select all that apply.
8
With the exception of He, how many valence electrons do noble gases have?
atomic number, 44, mass number, 101
the model shows values corresponding to a mystery element, element "X", on the periodic table. Choose the correct terms to complete the sentences. The --------- is the total amount of protons in the nucleus of an atom, which is represented by the number -------- in the model. The ------------ is the total amount of protons and neutrons in the nucleus of an atom, which is represented by the number ---------- in the model.
The calcium ion is smaller than the calcium atom because the same number of protons now attract a fewer number of electrons.
A calcium ion is formed from a calcium atom. How do the sizes of the calcium atom and calcium ion compare to one another?
The molecules in the system have more kinetic energy than a solid.
A chemist is conducting an experiment on a system. At the beginning of the experiment, the chemist wants to determine the temperature of the system. The system has a definite volume but no definite shape. Which of the following is most likely also true for the system?
The element belongs in row 3 of the periodic table and is classified as a noble gas.
A mystery element has 18 protons. Which one of the following statements is true about the element?
one, seven
A sodium atom has ------ valence electron(s). A chlorine atom has ------ valence electron(s).
reactive, lose 1 electron
Alkali metals are highly ------ since they ----- easily to form ions.
mass, element, molecule, state
All matter has -------- and occupies space. The simplest form of matter containing only one type of atom with its own particular set of properties is called a(n) ------- . A combination of two or more atoms that can be the same or different is called a(n) ------- . Such combinations of atoms are held together by attractive forces, which help determine the ----- of matter.
2, 8, 18, 7
An atom of bromine has 35 electrons. These electrons are present in energy shells around the nucleus. Rearrange the number of electrons into the order in which they appear in the energy shells of a bromine atom. Start with the number of electrons in the energy shell closest to the nucleus.
17
Based on the electron configuration of Atom Y, to which group in the periodic table does it belong?
28.1 amu
Estimate the atomic mass of silicon based on the following information: The natural abundance of Si-28 is 92.23%. For Si-29, it is 4.67%, and for Si-30, it is 3.10%.
in order of increasing atomic number
How are the elements in today's modern periodic table arranged?
3
How many electrons are located in the outermost orbit in the Bohr model of a boron atom?
2
How many electrons does calcium donate to sulfur when calcium and sulfur form an ionic bond?
two
How many valence electrons are lost by Sr when forming SrI2
2
How many valence electrons are lost by the metallic element when forming the ionic compound BaS?
7
How many valence electrons does the fluorine atom have?
polar covalent bond
In a water molecule, the highly electronegative oxygen atom partially pulls the bonding electrons away from hydrogen, forming
carbon
In the text entry box, enter the name of the element with the electron configuration 1s2 2s2 2p2. Be sure to enter the name of the element and not the elemental symbol.
loses 1, gains 2
Lithium ------ -------electron(s) to become Li+. Sulfur ---- ----- electron(s) to become S2-.
properties, outermost, valence
Many of an atom's physical and chemical ------------ are determined based on electrons located in the ----------- energy shell of an atom. These electrons are called --------- electrons.
barium tin gallium potassium aluminum
Order the following atoms from highest to lowest number of protons
weak
Sucrose has a low melting point. This compound exhibits relatively intermolecular forces
ground, excited
The ------ state is the lowest possible energy level that an electron can occupy.When the electron gains energy, it may move to a higher energy level. This is called the----- state.
7,7,7
The atom has------- protons, ------ neutrons, and ----- electrons.
d
The figure shows different possible transitions of electrons as they move from higher energy states to lower energy states. Which transition will produce the spectrum line with the lowest wavelength in this element's atomic spectrum?
Metal: Element 2 is a solid that conducts electricity. Element 4 is malleable and can take the form of a shiny, solid sheet. Element 4 is malleable and can take the form of a shiny, solid sheet. Nonmetal Element 1 is a gas at room temperature.
The following are properties of various elements. Drag each property into the correct box in order to identify the element as a metal or a nonmetal.
two, six
The formula for a molecule of ethane (C2H6) is a combination of two CH3 molecules. An ethane molecule is made up of ----atom(s) of carbon and ----- atom(s) of hydrogen.
electrons, valence
The octet rule states that atoms tend to form bonds so that each atom has eight------in its ------- shell.
two, third period
The ribbon used during the classroom experiment is made of an element that has ---valence electrons. This element is present in the ----- of the periodic table.
D. It would most likely form cations when it reacts.
The search is now on for an element with atomic number 119. Based on periodic trends, which of the following would most likely be 'true' of this element?
K+ with no dots
Which is the correct Lewis structure for the K+ ion?
