regents 2017
compared to a potassium atom, a potassium ion has
a smaller radius
what occurs when a catalyst is added to a chemical reaction
alternate reaction pathway with a lower activation energy
state the trend in electronegativity for the halogens as these elements are considered in order of increasing atomic number
as atomic number increases, electronegativity decreases
The protons in an atom of an element is indicated by it's
atomic number
explain what the equation represents a transmutation
atomic number changes
compared to a sample of helium at STP, the same sample of helium at a higher temperature and a lower pressure
behaves more like an ideal gas
identify the decay mode of hydrogen-3
beta decay
what is conserved during all chemical reactions
charge
explain in terms of particles, why HC2H3O2 can conduct an electrical current
charged particles move more freely
Fission and fusion reactions both release energy. however only fusion reactions
combine light nuclei
When a reversible reaction is at equilibrium, the concentration of products and the concentration of reactants must be
constant
which phrase describes the two forms of phosphorus
different crystal structures and different properties
Which graph shows relationship between pressure and kelvin
direct increase
in which type of reaction can two compounds exchange ions to form two different compounds
double replacement
which particle has the least mass
electron
the joule is a unit of
energy
which electron transition results in a release of energy
fourth shell to the second shell
a sample of a gas is in a sealed rigid container that contains a constant volume
frequency of collisions increase, and the force increases
state the phase of chlorine at 281 K and 101.3kPa
gas
state the direction of heat transfer between the test tube and the water when the test tube was placed in the water
heat is transferred from the water to the test tube
in chemical reactions, the different between the potential energy and the products
heat of reaction
identify the type of chemical bond that forms when potassium reacts with bromine to form a salt
ionic
particle diagram of a solid sample of silver
metallic bonding
identify the nucleus that is found in an atom that has a stable valence electron configuration
nucleus 3
Which term is defined as the region in an atom where an electron is most likely located
orbital
distillation of crude oil from various parts of the world yields..
proportions of components in mixtures can vary
state evidence from the technician's data which indicates that sodium is more active than aluminum
sodium reacts vigorously with water
at STP, a two 5.0 gram solid samples of different ionic compounds have the same density
solubility in water
which type of formula shows an element symbol for each atom and a line for each bond between atoms
structural
Given the formula representing a molecule
the distribution of charge in the molecule is symmetrical
why the entropy of the water decreases when the water freezes
the molecules of H2O(s) are less disordered than H2O(l)
which statement explains why 10.0 mL of a 0.50 M H2SO4 solution exactly neutralizes
the moles of H+ equal the moles of OH-
compare the strength of attraction for electrons by a hydrogen atom
the oxygen atom has a stronger attraction for electrons than the hydrogen atom
a solid sample of a compound and a liquid sample of the same compound are each tested
the solid is a poor conductor, and the liquid is a good conductor
which form of energy is associated with the random motion of particles in a gas
thermal
given the equation representing a chemical reaction at equilibrium in a sealed
to the right, and the concentration oh HI increases
state the color of bromthymol blue indicator in a sample of commercial vinegar
yellow
Which numerical set up can be used to calculate the atomic mass of gallium?
(0.6011)(68.926u) + (0.3989)(70.925)
The numerical set up calculating percent by mass of KNO3 in the solution
(100 x 70) / 170
How numerical set up of mass for 4.2 mole sample of 02 (32 g/mol).
(4.2)(32)
what is the mass of an original 5.60 gram sample of iron-53 that remains unchanged after 25.53 minutes
0.70 g
The mole ratio of NO to NO2 is
1 to 1
total mass of NaCl produced
117g
determine the number of additional grams of KNO3 that must dissolve to make this solution saturated *
12g to 16g
determine the mass number of the nuclide represented by nucleus 2
18
what is the number of electrons shared between the atoms in an I2 molecule
2
which electron configuration represents the electrons of an atom of neon in an excited state
2-7-1
What is the number of electrons in an atom of scandium
21
at STP which gaseous sample has the same number of molecules ad 3.0 liters of N2(g)
3.0 L
pH question
3.4
balance the equation
4,3,2,6
determine the quantity of heat released when 2.00 grams of H2O(l) freezes at 0C *
668 joules
Determine new pressure of 6.40 L samples of oxygen at 300k and 100k after gas is compressed to 2.4 L at 900K.
800 kPa (P1V1/T1 = (P2V2/T2)
copper at room temperature, percent of error
9.2%
the particle represented by X is
9/4Be
based on table F identify one ion that reacts with iodide ions in an aqueous solution tho form an insoluble compound
Ag+
Write the empirical formula of ethene C2H4
CH2
in which 1.0 gram sample are the particles arranged in a crystal structure
CaCl2(s)
which substance has non polar covalent bonds
Cl2
identify the element that has atomic nuclei represented by nucleus
Flourine
The average kinetic energy of water molecules decreases when
H20 at 337 K changes to H2O at 300K
Which formula represents the H+ acceptor in the forward reaction
HCO3-
which pair of compounds represents one Arrhenius acid and one Arrhenius base
HNO3 and NaOH
Which is the chemical formula for sodium sulfate?
Na2SO4
Explain why the nucleus 2 and 4 represent Dif isotopes of the same element
Same # of protons
identify the element in this table that is classified as a metalloid
Si
Which statement describes the structure of an atom
The nucleus has pos charge and is surrounded by neg charged electrons
