Matter
2. From a given model, how can atoms be represented in terms of subatomic particles?
2 answer: protons, neutrons, and electrons
7. How is the periodic table arranged in terms of metallic character?
7answer. metallic property increasing down a group and decreasing across a period from left to right
113. What are the characteristics (frequency, wavelength, and energy) of the colors within the visible light spectrum?
113 answer: The visible light spectrum, ranging from violet to red
shorter wavelengths= higher frequencies= and greater energy
longer wavelengths=lower frequencies =less energy.
101. How does an increasing distance affect a static charge?
101 answer: the electrostatic force between them decreases
108. What two factors are conserved when objects interact?
108 answer: momentum and energy
12. What are the similarities and differences between pure substances and mixtures?
12 answer: Pure substances-one type of matter
mixtures- two or more different substances
6. How can the data represented on the periodic table be used to predict properties of atoms?
6 answer: patterns: groups (vertical columns) and periods (horizontal rows).
116. What is an electromagnetic wave?
116 answer: (oscillations) disturbances that travel through space, carrying energy
99. How can the potential energy of a rubber band be changed?
99 answer: stretching or compressing it
91. How can the relationship between Earth and magnets be explained?
91 answer: Earth behaves like a giant magnet due to the movement of molten iron in its outer core, creating electric currents that generate a magnetic field
30. What is the relationship between the kinetic energy of gases, liquids, and solids?
30 answer:
lowest in solids
intermediate in liquids
highest in gases
20. What is the difference between an atom, a molecule, and a compound?
20 answer: An atom is the smallest unit of an element
molecule is two or more atoms chemically bonded together
compound is a molecule composed of two or more different elements
118. What types of signals are carried by electromagnetic waves?
118 answer: audio, video, or data, for communication
98. How do the potential energy and the kinetic energy of a roller coaster cart change as the cart moves along a track?
98 answer: its potential energy (PE) decreases as it descend, increases as it ascends
while its kinetic energy (KE) increases as it descends (gaining speed) and decreases as it ascends (losing speed)
107. What is the law of conservation of energy?
107a. energy can neither be created nor destroyed - only converted from one form of energy to another.
23. How would models serve to construct explanations that differentiate homogeneous and heterogeneous mixtures?
23 answer: uniformity or non-uniformity
1. How can matter be described in terms of atoms and molecules, which are too small to be seen by the naked eye?
1 answer: These particles are the fundamental building blocks of everything.
124. What is a binary code system?
124 answer: the foundation of computing, uses only two digits (0 and 1) to represent data and instructions
94. What tools are needed to determine how speed, mass, and kinetic energy are related?
94 answer: a scale to measure mass, a way to measure speed (like a stopwatch or motion sensors), and the kinetic energy formula (KE = 1/2 * m * v^2)
103. How is temperature related to energy?
103 answer: a higher temperature indicates faster-moving particles and thus more thermal energy
11. Which characteristics of a molecule can be demonstrated by a ball-and-stick model?
11 answer: three-dimensional structure of a molecule
9. What is the relationship between the number of valence electrons and the types of bonds formed between atoms?
Think Octet Rule
9 answer: The number of valence electrons an atom possesses dictates the type and number of bonds it can form
110. What are waves, and how can they be categorized?
110 answer: Waves are disturbances that transfer energy from one place to another
mechanical or electromagnetic
93. What factors affect the speed of an object?
93 answer: the force acting on it, the object's mass, the surface it's moving on, and the presence of friction or other resistive forces like air resistance.
102. How do batteries affect the energy of an electrical system?
102 answer: store chemical energy and convert it into electrical energy, providing a mobile power source and enabling energy storage for later use