TEXES SCIENCE PRACTICE Test Exam
Questions and Answers Latest 2025 Top Rated
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What is the major distinction between multicellular vs.
unicellular organisms?
Multicellular organisms have a specific "job" or function; whereas
unicellular organisms are less specialized
Conifer needles are designed to...
prevent the release of water
Classification differences of toads in the same region is
dependent upon...
breeding patters
What is the primary difference between normal cells and
cancer cells?
Cancer cells continue to reproduce even if they are tightly packed
together
What is the function of enzymes in biological systems?
To speed up the process of reactions when temperature must
remain constant to sustain life
An example of a homologous structure is...
a cat's forelimb and the pectoral fin of a dolphin (notice both
critters are mammals!)
Stomata
stomata regulate the release of water and gases
stomata should close during a drought and open during a time of
plenty
Bohr's Model of the Atom
A photon is emitted whenever an electron moves down an energy
level
If a gas with a pressure of 1 atm expands into a volume that
is twice its original size, and the temperature raises from 100
K to 400 K, what is the final pressure?
2 atm
,What are two methods of speeding up chemical reactions?
1.) increase the surface area of reactants
2.) increase the concentration of reactants
Redox Reaction
Adds an electron and produces oxygen
Sponateous Reactions
The addition of enthalpy and entropy to make Gibb's Free Energy
If Gibb's Free Energy is negative, the reaction is spontaneous
Bronsted-Lowery Acids
give up an H+
(example: C2H4O2)
Bronsted-Lowery Bases
accept an H+
Levels of Radiation
1.) Alpha
2.) Beta
3.) X-ray
4.) Gamma
5.) Neutron
A triple bond is stronger than a hydrogen bodnd and a
double bond
A triple bond is stronger than a hydrogen bodnd and a double
bond
Saturated Solutions
When you introduce more solute, no more is dissolved and it just
sinks to the bottom
Supersaturated Solutions
When you introduce more solute, no more is dissolved and it
combines with the existing solute on the bottom to make larger
cubes of solute
Unsaturated Solutions
, When you introduce more solute, id dissolves in the solvent
completely
Acids
low pH and have H+ ion
Bases
high pH and have an OH- ion
Distillation
the utilization of condensation and evaporation to separate two
components of a mixture
Partial Pressure
The product of the molar ratio and the total pressure
H2 and O2 at the same temperature have identical...
kinetic energy
Strong Acids
completely disassociate in water
Equation for heat absorbed
q = m c (change in temperature)
q = heat absorbed
m = mass
c = specific heat
t = temperature in Celsius
Ionization Energy
is determined by an elements proximity to Helium, which has the
largest ionization energy and Fr, which has the lowest ionization
energy
Photoelectric Effect (light incidence)
The greater the amount of light incidence the greater the energy
of the electrons emitted
Ionic Bonds
form between a metal and nonmetal
Covalent Bonds
Questions and Answers Latest 2025 Top Rated
A+
What is the major distinction between multicellular vs.
unicellular organisms?
Multicellular organisms have a specific "job" or function; whereas
unicellular organisms are less specialized
Conifer needles are designed to...
prevent the release of water
Classification differences of toads in the same region is
dependent upon...
breeding patters
What is the primary difference between normal cells and
cancer cells?
Cancer cells continue to reproduce even if they are tightly packed
together
What is the function of enzymes in biological systems?
To speed up the process of reactions when temperature must
remain constant to sustain life
An example of a homologous structure is...
a cat's forelimb and the pectoral fin of a dolphin (notice both
critters are mammals!)
Stomata
stomata regulate the release of water and gases
stomata should close during a drought and open during a time of
plenty
Bohr's Model of the Atom
A photon is emitted whenever an electron moves down an energy
level
If a gas with a pressure of 1 atm expands into a volume that
is twice its original size, and the temperature raises from 100
K to 400 K, what is the final pressure?
2 atm
,What are two methods of speeding up chemical reactions?
1.) increase the surface area of reactants
2.) increase the concentration of reactants
Redox Reaction
Adds an electron and produces oxygen
Sponateous Reactions
The addition of enthalpy and entropy to make Gibb's Free Energy
If Gibb's Free Energy is negative, the reaction is spontaneous
Bronsted-Lowery Acids
give up an H+
(example: C2H4O2)
Bronsted-Lowery Bases
accept an H+
Levels of Radiation
1.) Alpha
2.) Beta
3.) X-ray
4.) Gamma
5.) Neutron
A triple bond is stronger than a hydrogen bodnd and a
double bond
A triple bond is stronger than a hydrogen bodnd and a double
bond
Saturated Solutions
When you introduce more solute, no more is dissolved and it just
sinks to the bottom
Supersaturated Solutions
When you introduce more solute, no more is dissolved and it
combines with the existing solute on the bottom to make larger
cubes of solute
Unsaturated Solutions
, When you introduce more solute, id dissolves in the solvent
completely
Acids
low pH and have H+ ion
Bases
high pH and have an OH- ion
Distillation
the utilization of condensation and evaporation to separate two
components of a mixture
Partial Pressure
The product of the molar ratio and the total pressure
H2 and O2 at the same temperature have identical...
kinetic energy
Strong Acids
completely disassociate in water
Equation for heat absorbed
q = m c (change in temperature)
q = heat absorbed
m = mass
c = specific heat
t = temperature in Celsius
Ionization Energy
is determined by an elements proximity to Helium, which has the
largest ionization energy and Fr, which has the lowest ionization
energy
Photoelectric Effect (light incidence)
The greater the amount of light incidence the greater the energy
of the electrons emitted
Ionic Bonds
form between a metal and nonmetal
Covalent Bonds
