In an experiment, the factor that we measure is called the
A) independent variable
B) controlled variable
C) conclusion
D) dependent variable
All the things in an experiment that must be the same to make it fair
are called;
A) controlled variables or constants
B) dependent variables
C) independent variables
A scientist hypothesizes the temperature at which an alligator's
egg is incubated will determine whether the alligator will be male
or female. The independent variable is;
A) the temperature
B) the gender of the alligator
C) the incubator
D) the male alligators
A scientist hypothesizes the the temperature at which an alligator's
egg is incubated will determine whether the alligator will be male
or female. The dependent variable is;
A) the temperature
B) the size of the baby alligators
C) the incubator
D) the gender of the baby alligators
Anita, a biology student conducted an experiment to find out how light and
plant fertilizer affects the growth of a particular type of plant. She grew four
plants and treated them differently. After five weeks, the plants looked as
shown below.
What is the dependent variable of this experiment?
A.The number of plants
C. the application of light
B. The growth of the plants
D. the application of fertilizers
A scientist conducted an experiment to determine how the amount
of salt in a body of water affects the number of plants that can live
in the water. In this experiment the independent variable is
A) the temperature of the water
B) the number of plants in the water
C) the amount of salt in the water
D) the water
A scientist conducted an experiment to determine how the amount
of salt in a body of water affects the number of plants that can live
in the water. In this experiment the dependent variable is;
A) the water
B) the temperature of the water
C) the number of plants in the water
D) the amount of salt in the water
A scientist who wants to study the affects of fertilizer on plants
sets up an experiment. Plant A gets no fertilizer, Plant B gets 5 mg.
of fertilizer each day, and Plant C gets 10mg. of fertilizer each day.
Which plant is the control group.
A) Plant A
B) All of them
C) Plant B
D) Plant C
The set-up of your experiment has two identical plants, one under the
shade of a roof, the other in direct sunlight. Assuming all other factors
constant, what could be the hypothesis of your experiment?
A. A plant will change into a different kind of plant if placed in the
shade.
B. Sunlight will become more abundant if a plant is placed in its direct
path.
C. A plant in direct sunlight will grow faster than an identical plant
placed in the shade.
D. A plant will increase the amount of fertilizer and water in the soil if
placed in direct sunlight
• What effect does high temperature have on radish germination?
Alternative: High temperature affects amount of radish germinated.
Null: High temperature does not affect amount of radish germinated
• Does studying with music have an effect on test scores of students?
Alternative: Studying with music affects the test scores of students.
Null: Studying with music does not affect the test scores of students.
• Does light intensity have on a plant growth?
Alternative: Light intensity affects the growth of a plant.
Null: Light intensity does not affect the growth of a plant.
• What effect does high temperature have on radish germination?
Independent: Level of Temperature
Dependent: Amount of Radish Germinated
• What effect does studying with music have on student test scores?
Independent: Presence of Music
Dependent: Test Scores of Students
• What effect does light intensity have on a plant growth?
Independent: Light Intensity
Dependent: Plant Growth/ Plant Height
How does a physical change differ from a chemical change?
A.
New volumes are created in a physical change.
B.
New materials are produced in a physical change.
C.
The composition is unchanged in a physical change.
D.
The change is reversible in a chemical change.
It is the simplest form of matter.
A. Compound
B. Element
C. Mixture
D. Substance
It can be broken down into two or more components.
A. Compound
B. Element
C. Mixture
D. Substance
All are elements, EXCEPT
A. Selenium
B. Silicon
C. Sodium
D. Sulfate
Which of the following is NOT a compound?
A. Carbon dioxide
B. Germanium
C. Water
D. Salt
The following are compounds, EXCEPT
A. Ammonia
B. Arsenic
C. Methane
D. Oxide
Which of the following contains three elements?
A. Argon, Magnesium, Phosphorus
B. Brass, Phosphorus, Potassium
C. Chlorine. Air, Nitrogen
D. Petrol, Alcohol, water
Which of the following statements is TRUE of a compound?
A. Its constituents can be separated by physical methods.
B. Its constituents are present multiple proportions.
C. Its properties are similar to those of its constituents.
D. It contains two or more elements
Which of the following boxes represents a compound?
A
B
C
D
What are metalloids?
A)
elements found in asteroids
B)
elements that are larger than nonmetals
C)
elements that have properties different than either the
metals or the nonmetals
D)
elements that have some properties like metals and some
like nonmetals
Which statement is NOT true of nonmetals?
A)
They have characteristics of both metals and nonmetals.
B)
Many are gases at room temperature.
C)
They have low conductivity.
D)
There are fewer nonmetals than metals.
The chemical formula for water, H2O, means that each water
molecule contains
A.
two hydrogen atoms and two oxygen atoms.
B.
two hydrogen atoms and one oxygen atom.
C.
two hydrogen atoms and zero oxygen atoms.
D.
one hydrogen atom and two oxygen atoms.
.
Which of the following statements is TRUE?
A. Elements are the only kind of matter that can be properly
classified as pure substances.
B. Only pure matter is classified as a substance, which includes
only elements and compounds.
C. All mixtures can easily be identified as impure, since the
components are always easily recognizable.
D.All solutions consist of a solid dissolved in a liquid.
Which of the following can be separated only by chemical means?
A.
sodium
C. water
B.
salt water
D. gold
Which of the following best describes chicken noodle soup?
A.
element
C. compound
B.
mixture
D. solution
Which of the following can be separated only by chemical means?
A.
sodium
C. water
B.
salt water
D. gold
Which of the following best describes chicken noodle soup?
A.
element
C. compound
B.
mixture
D. solution
Mixture
Heterogenous
Mixture
Homogenous
Substance
Element
Substance
Compound
Mixture
Mixture
Mixture
Substance
Substance
Substance
Mixture
Mixture
Heterogenous
Heterogenous
Homogenous
Element
Element
Compound
Homogenous
Heterogenous
Pure Substance Element
Mixture (of elements &
compounds) - homogeneous
Mixture (of elements &
compounds) - homogeneous
Pure substance - Compound
Pure substance Compound
Mixture (of elements &
compounds) - homogeneous
Mixture (of elements) homogeneous
Pure substance -
What is the difference between a substance and a mixture?
A. Substance can be separated while mixture cannot be separated.
B. Substance has many components while mixture has one only.
C. Substance is heterogeneous while mixture is homogeneous.
D. Substance is pure while mixture is impure.
What is the best way to use in separating iron parts from a mixture?
A. Filter paper
B. Magnet
C. Spoon
D. Sodium chloride dissolves in water very well.
Based on the table above, which of the
following is TRUE about Liquid A?
A. It has a fixed boiling point.
B. It is heterogeneous.
C. It is a mixture.
D. It is an element
Which of the following could be Liquid A?
A. Water
B. Salt
C. Soda/Soft Drink
D. Ethyl Alcohol
Which series of methods should James follow to separate a mixture of
pepper and salt?
A. Dissolve in water, Magnetism and Filtration
B. Dissolve in water, Filtration and Evaporation
C. Dissolve in water, Distillation and Magnetism
D. Dissolve in water,Chromatography and Distillation
Cookies and cream ice cream would be classified as _______.
A. a compound
B. a homogeneous mixture
C. an element
D. a heterogenous mixture
Peter wants to compare the chemical properties of two substances. In
doing it, he prepared two flasks containing the substances and labeled
them Liquid A and Liquid B. He monitored the boiling points of the liquids
and found that the boiling points were 100˚C for substance A and 110˚C 112˚C for liquid B.
How would you classify the two liquids?
A. Liquid A is pure substance while Liquid B is a mixture.
B. Liquids A and B contain two or more atoms that are chemically bonded.
C. Liquid A has varying boiling points while liquid B has a fix boiling point.
D. Liquid A maybe homogenous or heterogeneous but substance B is not
Vince wants to separate the stones in a jar full of water. Which of the
following is the BEST way to separate the mixture?
A. Decantation
B. Dissolving
C. Evaporation
D. Using a magnet
Which of the following uses evaporation as a means of separating the
components of the given mixture?
A. Oil and water
B. Pebbles and sand
C. Sand and gravel
D. Salt and water
On dissolving sugar in water at room temperature solution feels
cool to touch. Water is a polar compound. Which of the following
will readily dissolve in water?
a. Starch
b. Salt
c. fats
d. Aluminium
In a mixture of coffee dissolving easily in hot water. Coffee is a;
a. Solute
b. Solvent
c. solution
d. suspension
Calculate the percent by volume of a solution containing 350 mL of
isopropyl alcohol in 500 mL rubbing alcohol.
a. 30%
b. 40%
c.70%
d.60%
How does the temperature of liquid solvent affect to the solubility
of solid solute?
a. When temperature of the liquid solvent increases, the solubility
of solid solute decreases.
b.When temperature of the liquid solvent increases, the solubility of
solid solute increases.
c.There is no change in the solubility
d.The change in solubility is unpredictable.
On dissolving sugar in water at room temperature solution feels
cool to touch.
Under which of the following cases dissolution of sugar will be
most rapid?
A. Sugar crystals in cold water.
B. Sugar crystals in hot water.
C. Powdered sugar in cold water.
D. Powdered sugar in hot water.
At a given temperature, osmotic pressure of a concentrated
solution of a substance _____________.
A. is higher than that at a dilute solution.
B. is lower than that of a dilute solution.
C. is same as that of a dilute solution.
D. cannot be compared with an osmotic pressure of a dilute
solution.
In a chemistry class, Gabby prepared a solution by mixing 25
gram(g) of sugar in 80g of water. What are the concentrations of
the solute and solvent in percent (%) by mass?
A. Solute: 34% ; Solvent: 60%
B. Solute: 14% ; Solvent: 86%
C. Solute: 24% ; Solvent: 76%
D. Solute: 44% ; Solvent: 56%
What is the percentage concentration in the following solution
given that 5 ml sucrose in 90 ml water?
A. 4 %
B. 5 %
C. 6 %
D. 7%