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BAIS

BAIS Science Semester 2 Exam

QuestionAnswer
A liquid mixture in which particles can be seen and easily separated by settling or filtration is a suspension.
Table sugar and table salt are examples of compounds
What is one way to increase the solubility of sugar in water? Heat the water.
When you add so much solute that no more dissolves, you have a saturated solution
Substances that CANNOT be broken down chemically into other substances are elements.
In the periodic table, the most reactive metals are found in Group 1, the first column on the left.
Radio waves, visible light from the sun, infrared “rays” from heat lamps, the waves that heat food in a microwave oven, ultraviolet rays, and X-rays are all considered types of electromagnetic energy.
Which group contains the most elements? metals
Which of the following scientists inferred that an atom’s positive charge must be clustered in the nucleus? Ernest Rutherford
Most metals are NOT a. ductile. b. good conductors of heat and electricity. c. liquid at room temperature. d. malleable. C. Liquids at room temperature
The elements in a column of the periodic table a. have similar properties. b. are in the same period. c. have the same atomic mass. d. have very similar chemical symbols. a. Have similar properties
A material is said to be ductile if it can be pulled out, or drawn, into a long wire.
In a neutral atom, the number of protons equals the number of electrons
Mendeleev created the first periodic table by arranging elements in order of increasing atomic mass.
Evidence of chemical change may include the formation of a gas, a color change, and the production of one or more new substances.
Anything that has mass and takes up space is considered matter.
Which of the following is NOT a correct inference that you can make about the burning of gasoline? a. Chemical bonds are broken and others are formed. b. The reaction is a physical change. c. New substances are produced. d. Energy is released. b. the reaction is a physical change
As in the case of unlike magnetic poles, unlike electric charges attract
One example of a physical change is dissolving salt in water
One example of a chemical change is burning wood
The pH scale measures the concentration of hydrogen ions. (potential Hydrogen)
Acids are described as corrosive because they “eat away” at other materials.
All elements are composed of extremely small particles called atoms.
The change in which ice absorbs energy and melts is a(n) endothermic change.
Each family in the periodic table has its own characteristic properties based on the number of valence electrons
When an atom loses an electron, it becomes a positive ion.
What is the chemical name for the compound with the formula NaCl? sodium chloride (table salt)
What is the greatest number of valence electrons an atom can have? 8
If atoms of a halogen nonmetal (Group 17) gain one electron, the atoms then have 8 valence electrons.
The ability to do work or cause change describes energy.
The loss of static electricity as electric charges move off an object is called electrical (or static) discharge.
The energy of matter in motion is called kinetic energy.
The measurement of the force of gravity on an object is the object’s weight.
The change in which ice absorbs energy and melts is a(n) endothermic change.
What subatomic particle has a negative charge and is vital in the flow of electricity? electron
In an ionic bond, valence electrons are taken or given up
According to Newton’s third law of motion, when a hammer strikes and exerts force on a nail, the nail exerts an equal force back on the hammer.
Most metals are NOT liquid at room temperature.
In physical science, a push or a pull is called a(n) force.
The two primary kinds of energy are kinetic and potential
Energy is measured in units called joules.
An example of something that stores chemical energy is a. lightning. b. a microwave. c. a match d. light. a match.
An electric current will always follow the path of least resistance.
Moving water can be used to produce electricity because most forms of energy can be converted into other forms.
An example of a fossil fuel is petroleum.
What type of conversion is taking place when natural gas is used to heat water? chemical energy into thermal energy
Fossil fuels contain energy that originally came from the sun
Mendeleev created the first periodic table by arranging elements in order of increasing atomic mass.
How did chemists change Mendeleev’s periodic table in the early 1900s? They used atomic number instead of atomic mass to organize the elements.
Niagara Falls is a good example of what kind of energy conversion? potential energy being converted into kinetic energy.
Which of the following scientists inferred that an atom’s positive charge must be clustered in the nucleus? Ernest Rutherford
Energy stored in the nucleus of an atom is called nuclear energy.
In the periodic table, the most reactive metals are found in Group 1, the first column on the left.
A material is said to be ductile if it can be pulled out, or drawn, into a long wire.
Which group contains the most elements? metals
What type of energy does a spinning turbine have? mechanical energy
The law of conservation of energy states that when one form of energy is converted into another no energy is created or destroyed in the process.
When generators are spun by turbines, they produce electricity.
Potential energy that depends on height is called gravitational potential energy.
The type of energy stored by fossil fuels such as coal is chemical potential energy.
Visible light is an example of electromagnetic energy.
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