Grade 9 Science Final Review

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Questions and Answers

According to the particle theory, which statement best describes the attraction between particles in a liquid?

Particles have moderate attractive forces, allowing them to flow. (correct)

Particles have very strong attractive forces and are held in fixed positions.

Particles experience no attractive forces.

Particles have weak attractive forces, allowing them to move freely.

How does increased deforestation most directly impact biodiversity?

It causes all animals to relocate to other locations.

It does not affect biodiversity.

It decreases biodiversity by removing many habitats. (correct)

It increases the number of habitats available for animals.

A fish being 'stuck under a layer of algee' implies that the algee is directly:

Helping to clean the water where the fish lives.

Increasing the amount of oxygen available to the fish.

Preventing the fish from accessing necessary resources or moving freely. (correct)

Causing a surge in the biodiversity of the body of water.

According to the particle theory, which property of gas particles is most responsible for their ability to move freely in all directions?

The large spaces between the particles. (C) Signup and view all the answers

Which statement best describes the kinetic energy of particles in solids according to the particle theory?

Particles have low kinetic energy and vibrate in place. (C) Signup and view all the answers

Which of the following best describes the change when chalk crumbles into powder?

Physical change and physical property. (A) Signup and view all the answers

What type of change occurs when magnesium metal reacts with acid to form hydrogen gas?

Chemical change. (B) Signup and view all the answers

Radium being radioactive would be categorized as a:

Chemical property. (C) Signup and view all the answers

Which option correctly classifies jello?

Mixture, homogenous. (A) Signup and view all the answers

How is vegetable soup classified?

Mixture, homogenous. (A) Signup and view all the answers

Why would oil be categorized as a pure substance?

Because it is a single compound with a consistent composition. (A) Signup and view all the answers

Which of the following is a quantitative physical property?

Density (B) Signup and view all the answers

A mixture of two liquids releases bubbles and creates a popping sound when tested with a lit splint. What type of classification is this reaction?

Chemical change. (D) Signup and view all the answers

What role do decomposers play in an ecosystem?

They break down dead organisms and waste, releasing nutrients. (A) Signup and view all the answers

If a disease wiped out the mouse population in an ecosystem, what would be the immediate, direct effect?

A decrease in the snake and hawk populations. (A) Signup and view all the answers

Which of the flowing process is described by this equation: $Carbon \ Dioxide + Water + Solar \ Energy \rightarrow Glucose + Oxygen$?

Photosynthesis (A) Signup and view all the answers

Which of the following is a similarity between photosynthesis and cellular respiration?

Both involve the exchange of energy and elements. (C) Signup and view all the answers

What is one major difference between photosynthesis and cellular respiration?

One releases energy; the other stores energy. (D) Signup and view all the answers

How would you classify the interaction between a hawk and a snake, where the hawk often eats the snake?

Predation (A) Signup and view all the answers

Which of the following best describes the role of decomposers in the carbon cycle?

They release carbon back into the environment from dead material. (D) Signup and view all the answers

How is the nitrogen cycle similar to the carbon cycle within an ecosystem?

Both cycles involve the cycling of elements through the environment and living organisms. (C) Signup and view all the answers

How many total atoms are present in 5 molecules of $LiBrO_3$?

25 (D) Signup and view all the answers

Which of the following elements has a full valence shell?

He (C) Signup and view all the answers

According to the information provided, which statement about atomic structure is false?

Electrons are located in the nucleus of an atom. (D) Signup and view all the answers

Which of the following correctly matches an element to its atomic number?

V - 23 (A) Signup and view all the answers

What is the number of neutrons in a lithium (Li) atom, according to the provided information?

4 (D) Signup and view all the answers

Which element is both considered a halogen and is in Group 2?

Br (D) Signup and view all the answers

Which of the following statements about the structure of the atom is TRUE, according to the information provided?

Atoms of one element are different from the atoms of a different element. (B) Signup and view all the answers

Which of the following is an alkali metal with 11 protons?

Na (D) Signup and view all the answers

During charging by induction, what is the primary purpose of grounding?

To allow electrons to flow to or from the object, resulting in a permanent charge. (D) Signup and view all the answers

Which of the following best describes a material where electrons are free to move?

Conductor (A) Signup and view all the answers

If a third light bulb is added in parallel to a circuit that already has two light bulbs, what happens to the brightness of the original two?

Their brightness remains the same. (D) Signup and view all the answers

If a switch in a circuit is replaced with a paperclip, which is a conductor, what will happen to the circuit's functionality, assuming the switch was closed before?

The circuit will be unaffected. (A) Signup and view all the answers

In a parallel circuit, if the total voltage measured across the battery is 240V, what is the voltage measured across each individual light bulb?

240V (B) Signup and view all the answers

In a parallel circuit, is it possible to place a switch such that it only controls one light bulb, without preventing the others from working?

Yes, by placing it in the branch leading to the specific light bulb (B) Signup and view all the answers

Which of the following is NOT a characteristic of an insulator?

Free electrons moving throughout the material (D) Signup and view all the answers

What is the essential difference between conductors and insulators in terms of electron behavior?

Conductors have free electrons that can move easily, while insulators have electrons tightly held to atoms. (D) Signup and view all the answers

What is the total current (I_source) in the provided circuit?

30 A (A) Signup and view all the answers

If the voltage across R1 is 240 V, and the current through it is 20 A, what is the resistance of R1 ($R = V/I$)?

12 Ω (D) Signup and view all the answers

Which of the following is NOT a factor in identifying the source of excess atmospheric carbon dioxide?

Analysis of nitrogen isotopes (C) Signup and view all the answers

What does the increased abundance of atmospheric carbon dioxide primarily indicate regarding Earth's temperature?

Higher global temperatures due to an enhanced greenhouse effect (D) Signup and view all the answers

What characteristic of fossil fuels is detected through isotopic analysis when assessing atmospheric carbon?

Low levels of carbon-14 (B) Signup and view all the answers

If $V_T$ (total voltage) is 240V and $I_T$ (total current) is 30A, what is $R_T$ (total resistance) of the circuit using Ohm’s Law ($R = V/I$)?

8 Ohms (A) Signup and view all the answers

How does the isotopic signature of atmospheric carbon dioxide link it to fossil fuels?

Atmospheric CO₂ shows low carbon-14 levels, characteristic of ancient carbon sources. (B) Signup and view all the answers

Based on available data, which observation supports the correlation between increased atmospheric CO₂ and global warming?

The last two decades have shown some of the hottest years on record. (C) Signup and view all the answers

Study Notes

Grade 9 Science Final Culminating and Exam Review

Final Culminating Breakdown
- Date: (Blank)
- Bell Ringer: Ecology (2 stations, 8 marks), Electricity (4 stations, 20 marks), Safety (1 station, 3 marks).Note: References provided at necessary stations. Chemistry (6 stations, 15 marks), Space (2 stations, 6 marks), Rest break and refine answers Stations Include: Electrostatic series, Equations, and Periodic Table.
- Duration: 48 minutes
- Permitted Materials: Scientific calculator, ruler, pencil, pen, eraser, whiteout
Exam Breakdown
- Date: (Blank)
- Written Examination: Total of 10 pages. Note: Page 1 is Instructions, Page 10 is references. Electrostatic series, Equations, and Periodic Table.
- Duration: 90 minutes
- Permitted Materials: Scientific calculator, ruler, pencil, pen, eraser, whiteout
- Sections: Part A: Multiple Choice (25 minutes, 10 marks), Part B: Matching (10 minutes, 4 marks), Part C: Short Answer (55 minutes, 17 marks. Ecology (10 marks), Chemistry (11 marks), Electricity (7 marks), Space (3 marks, n/a), Connections (3 marks) Total marks: 90 minutes, 35 marks Ecology, 21 marks Chemistry, 16 marks Electricity, 9 marks Space, 3 marks Connections

Ecology Concepts and Topics

Biotic Interactions: Commensalism, mutualism, parasitism, competition, predation
Energy Pyramids: 10% Rule, calculations, pyramid of numbers, pyramid of biomass
Ecosystem Components: Food chains, food webs, trophic levels, consumers, producers, autotrophs, herbivores, decomposers
Biotic and Abiotic Factors
Photosynthesis vs. Cellular Respiration: Chemical equations.
Ecological Niches
Cycles: Carbon Cycle and Nitrogen Cycle
Human Impacts: Global warming, eutrophication
Climate Change: Evidence, greenhouse effect

Chemistry Concepts and Topics

WHMIS, HHPS: Safety precautions and first aid treatments
Properties of Matter: Physical (qualitative and quantitative), chemical (reaction with acid, combustion, corrosion)
States of Matter: Physical changes, chemical changes evidence.
Classification of Matter: Pure substances, mixtures, elements, and compounds.
Particle Theory of Matter: Density (d = m/v)
Periodic Table: Period and group numbers, atomic notation, atomic theory.
Elements: Alkali metals, alkaline Earth metals, halogens, noble gases.
Periodic Trends: Orbital, valence electrons, and reactivity
BR Diagrams: Atoms and ions (cations and anions).
Chemical Formulas and Equations

Electricity Concepts and Topics

Electric Charge: Law of electric charge, charging by friction, conduction, and induction.
Electric Discharge: Temporary vs permanent charging, neutralization
Circuits: Circuit symbols, drawing circuits, insulators and conductors.
Electric Resistance: Factors influencing resistance, series vs. parallel circuits.
Ohm's law: Solving for missing values in series and parallel circuits.
Energy Conservation: Energy conservation, power generation, and sustainable energy use.

Space Concepts and Topics

Scale of the Universe, Big Bang Theory: Formation of the universe, galaxies, order of planets,
Solar System: Inner vs outer planets
Earth's Motions: Day, night cycles, seasons, rotation, axis, revolution, orbit
Star Formation: Small, medium and high mass star pathways

General Information

Written Examination: Total 10 pages.
Permitted Materials: Scientific calculator, ruler, pencil, pen, eraser, whiteout.

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Description

Prepare for the Grade 9 Science final with this comprehensive review. Cover key topics such as Ecology, Electricity, Chemistry, and Space through various examination formats. Make sure to utilize permitted materials effectively during the exam for the best results.