PACT Science 7-12 exam 2024/2025 with 100% correct answers
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Course
PACT Science 7-12
Institution
PACT Science 7-12
Ionic Character correct answersdifference between in electronegativity between two atoms
cation correct answerspositively charged ions
anion correct answersnegatively charged ions
Which organic compound smells like fruit? correct answersesters - mostly found in fruits
Compound correct a...
Ionic Character correct answersdifference between in electronegativity between two atoms
cation correct answerspositively charged ions
anion correct answersnegatively charged ions
Which organic compound smells like fruit? correct answersesters - mostly found in fruits
Compound correct answerssubstance containing two or more chemical elements held together by
chemical bonds
What type of reaction is the process of fermentation? correct answersexothermic (converting sugar into
alcohol)
Molar volume of any gas at STP correct answers22.4 L
What type of waves do two light sources emit in order to be coherent? correct answers- Waves of the
same wavelength having constant phase difference.
- two waves are coherent if they have the same relative phase
Wavelength correct answers- determines the nature of light
- violet is the shortest and red is the longest
- visible light is 400-700 nm
Amplitude correct answersdetermines the brightness or intensity of the light
Molarity correct answers- volume of solution and moles of solute
,- # of moles of solute dissolved per liter of solution
Neutrons quark configuration correct answers2 down 1 up
Can sunlight create music? correct answersYes
If lowest frequency is positioned in the P.T. against position number, then it observed that frequency is
increased directly. What type of increment is this? correct answersSimple Function of Ranking number
Suffix -ate indicates what about a compound? correct answersIt contains more oxygen
Why do passenger side mirrors have "objects are closer than they appear" printed on them? correct
answersThey are convex mirrors that allow drivers to get a wide-angle view of the road behind them,
and to the sides. This causes objects to appear more distant.
What basis is the modern P.T. arranged? correct answersatomic number
As electrons move between shells further from the nucleus, they emit __________ energy. correct
answersless
Endothermic Reaction correct answers- heat is absorbed and transferred from its surroundings to the
system.
- positive H
Exothermic Reaction correct answers- heat is emitted and transferred from the system to its
surroundings.
- negative H
Line Spectrum correct answers- spectrum that is obtained from the light emitted by the substance that is
vaporized in a flame or heated by an electric arc
- only a specific wavelength is emitted or absorbed
, - Determined by electrons moving in energy levels
Conductivity Range of Semiconductors correct answers10^3 to 10^−8 siemens/cm
Negative (concave) Diopter Lenses correct answers- used to treat myopia (nearsightedness)
- cause light rays to diverge
- increase the focal length to properly focus images back onto the retina
Positive (convex) Diopter Lenses correct answers- used to treat hyperopia (farsightedness)
- cause light rays to converge
Cylindrical Lenses correct answers- used to correct astigmatism
- curve in more than one direction
T or F: A body can change position without work being done on it. correct answersTrue -> Newton's 1st
law tells us that force does not have to act on an object to continue its motion and move from one place
to another. If no force is required, no work is being done.
What equation is true for ideal gases? correct answersC p,m - C v,m = R
- molar heat capacity at constant pressure is always greater than the molar heat capacity at constant
volume because work is done
The sum of the mass of reactants is less than the sum of the mass of the products in a nuclear reaction.
What kind of reaction took place? correct answersEndothermic nuclear reaction
- mass and energy are different states of the same things -> law of conservation of energy = law of
conservation of mass
Reflection of light: correct answersoccurs when a surface exposed to light immediately emits back a
portion of energy received
Refraction of light: correct answers- bending of light
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