English Vocabulary · Grade 9 Live Review Preview

9th Grade Vocabulary Words

Ninth grade marks the transition to high-school reading and writing across literature, argument, research, biology, physical and Earth science, algebra, computing, world history, civics, and geography. This level develops precise academic and domain-specific vocabulary while strengthening context, nuance, source evaluation, figurative language, and evidence-based communication.

This independently authored 800-word beta curriculum is arranged in twenty-three pages of up to thirty-five words. Pages containing words 1–500 include five cloze questions drawn only from that enhanced range; words 501–800 remain fully visible and editable as list pages while the expanded practice layer is developed. Each row includes a subject-field label and an editable word-study note about a transparent affix, compound structure, capitalization, or dictionary base form. The cited Grade 9 resources calibrate difficulty and study skills only; all learner-facing definitions, examples, quizzes, and descriptions are original KSSR copy.

Please note: the vocabulary lists for grades 9~11 have been selected to ensure no overlap with the previous grade level. If the words are too specialized or difficult for you, please go back to grade levels 4~8 and review the words on those pages.

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Words 316–350 of 800
#	Word	Details	Meaning	Sample sentence
316	solution concentration	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: solution + concentration. Study the complete expression as one field-specific unit.	concentração da solução	Evaporation increased the solution concentration.
317	molarity	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	molaridade	The beaker contained a molarity of 0.5 moles per liter.
318	pH scale	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: pH + scale. Study the complete expression as one field-specific unit.	escala de pH	Pure water is near 7 on the pH scale.
319	acid-base indicator	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: acid + base + indicator. Study the complete expression as one field-specific unit.	indicador ácido-base	Litmus is an acid-base indicator that turns red in acid.
320	electrolyte	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Base-form focus: electrolyte is the dictionary headword; compare its inflected or derived forms in context.	1. eletrólito 2. electrólito	Dissolved salt is an electrolyte.
321	nonelectrolyte	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Prefix focus: non- means not or without.	não eletrólito	Sugar is a nonelectrolyte in water.
322	oxidation number	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: oxidation + number. Study the complete expression as one field-specific unit.	número de oxidação	Oxygen usually has an oxidation number of negative two.
323	redox reaction	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: redox + reaction. Study the complete expression as one field-specific unit.	reação redox	Rusting is a redox reaction in which iron loses electrons.
324	electron transfer	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: electron + transfer. Study the complete expression as one field-specific unit.	transferência de elétrons	Electron transfer occurs from zinc to copper ions in the cell.
325	synthesis reaction	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: synthesis + reaction. Study the complete expression as one field-specific unit.	reação de síntese	A synthesis reaction joins hydrogen and oxygen to form water.
326	decomposition reaction	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: decomposition + reaction. Study the complete expression as one field-specific unit.	reação de decomposição	Heating calcium carbonate causes a decomposition reaction.
327	single-replacement reaction	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: single + replacement + reaction. Study the complete expression as one field-specific unit.	reação de substituição única	Zinc replacing hydrogen in acid is a single-replacement reaction.
328	double-replacement reaction	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: double + replacement + reaction. Study the complete expression as one field-specific unit.	reação de dupla substituição	The two clear solutions undergo a double-replacement reaction and form a solid.
329	precipitation reaction	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: precipitation + reaction. Study the complete expression as one field-specific unit.	reação de precipitação	Mixing silver nitrate and sodium chloride causes a precipitation reaction.
330	net ionic equation	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: net + ionic + equation. Study the complete expression as one field-specific unit.	equação iônica líquida	The net ionic equation omits ions that remain unchanged.
331	scalar	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Base-form focus: scalar is the dictionary headword; compare its inflected or derived forms in context.	escalar	Temperature is a scalar.
332	vector	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Base-form focus: vector is the dictionary headword; compare its inflected or derived forms in context.	1. vector 2. vetor	Velocity is a vector because its direction matters.
333	vector magnitude	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: vector + magnitude. Study the complete expression as one field-specific unit.	magnitude vetorial	The arrow's length represents the vector magnitude.
334	instantaneous velocity	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: instantaneous + velocity. Study the complete expression as one field-specific unit.	velocidade instantânea	The speedometer approximates the car's instantaneous velocity.
335	average acceleration	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: average + acceleration. Study the complete expression as one field-specific unit.	aceleração média	The runner's average acceleration was greatest during the first two seconds.
336	linear momentum	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: linear + momentum. Study the complete expression as one field-specific unit.	momento linear	A moving truck has more linear momentum than a bicycle at the same speed.
337	impulse	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Base-form focus: impulse is the dictionary headword; compare its inflected or derived forms in context.	impulso	An air bag extends the stopping time and changes the passenger's momentum with a smaller impulse force.
338	rotational inertia	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: rotational + inertia. Study the complete expression as one field-specific unit.	inércia rotacional	Moving mass farther from an axis increases rotational inertia.
339	force equilibrium	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: force + equilibrium. Study the complete expression as one field-specific unit.	equilíbrio de força	A hanging lamp at rest is in force equilibrium.
340	frictional force	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: frictional + force. Study the complete expression as one field-specific unit.	força de atrito	The frictional force between shoes and the floor prevents slipping.
341	gravitational force	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: gravitational + force. Study the complete expression as one field-specific unit.	gravidade	Earth's gravitational force pulls the ball downward.
342	normal force	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: normal + force. Study the complete expression as one field-specific unit.	força normal	The table's normal force balances the book's weight.
343	applied force	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: applied + force. Study the complete expression as one field-specific unit.	força aplicada	The worker's applied force moved the crate across the floor.
344	tension force	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: tension + force. Study the complete expression as one field-specific unit.	força de tensão	The cable's tension force supports the elevator.
345	free-body diagram	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: free + body + diagram. Study the complete expression as one field-specific unit.	diagrama de corpo livre	The free-body diagram includes gravity, support, and friction.
346	Newton's first law	proper noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: Newton's + first + law. Study the complete expression as one field-specific unit.	1. primeira lei de Newton 2. princípio da inércia	Newton's first law explains why a puck keeps sliding on nearly frictionless ice.
347	Newton's second law	proper noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: Newton's + second + law. Study the complete expression as one field-specific unit.	1. princípio fundamental da dinâmica 2. segunda lei de Newton	Newton's second law predicts greater acceleration when the same mass receives a larger force.
348	Newton's third law	proper noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: Newton's + third + law. Study the complete expression as one field-specific unit.	1. princípio da ação e reação 2. terceira lei de Newton	Newton's third law pairs the swimmer's push on water with water's push on the swimmer.
349	conservation of momentum	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: conservation + of + momentum. Study the complete expression as one field-specific unit.	conservação do momento	Conservation of momentum explains the motion of two skaters who push apart.
350	elastic collision	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: elastic + collision. Study the complete expression as one field-specific unit.	colisão elástica	An ideal elastic collision allows two hard spheres to rebound without losing kinetic energy.

Vocabulary reading and practice

Forces and Solutions

Reading practice for pages 10–12. Five relevant words are highlighted.

English reading

A beaker rests on a scale while gravitational force pulls it downward and normal force from the scale pushes upward. Inside, a precipitation reaction forms a solid from two clear solutions. The chemist describes each solution concentration with molarity, the number of moles of dissolved substance per liter of solution.

Portuguese translation

A reviewed translation is not available for this passage yet.

Reading comprehension

1. Which force pulls the beaker downward?

Gravitational force pulls it downward.

2. What forms during a precipitation reaction?

A solid forms from the solutions.

3. What does molarity measure?

Molarity measures moles of solute per liter of solution.

Vocabulary quiz

Choose the dictionary equivalent for each of 5 selected words.

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Sources and curriculum references

These references guide selection and calibration. Definitions, sample sentences, readings, questions, and teaching notes are independently written and reviewed.

9th Grade Vocabulary Words

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