化学 MCAS — Practice Tests & Mock Exams

原子结构、化学键、反应、化学计量、气体定律、溶液和热化学。

Semester A

50 questions · 180 min · 80% to pass

Free Practice (10)
Semester B

50 questions · 180 min · 80% to pass

Free Practice (10)
Free practice gives instant feedback. Sign up for full mock exams.
Don't wait until exam week to practice

Cramming right before the test feels productive but hides your real gaps. A full-length mock now diagnoses which Massachusetts categories you're weakest in — so you can focus your study only where it counts. Learning science is clear: retrieval practice and spaced study beat last-minute cramming. Starting earlier is the higher-scoring path.

Learn the Concepts

Visual lessons that build 化学 from first principles — diagrams, worked examples, embedded practice.

Concept Lesson · 10 min· Massachusetts 5A,7A,8A,9A,10A
化学 核心概念

周期趋势、化学键、化学计量、气体定律、酸碱化学。

Start lesson →
Concept Lesson · 7 min· Massachusetts 1A,2A,3F
Lab Safety & the Scientific Method

Before you mix anything: master the safety rules and the experimental mindset that every Regents question tests. Hypotheses vs theories, controls, sig figs, and the everyday gear that keeps the lab safe.

Start lesson →
Concept Lesson · 8 min· Massachusetts 4A,4B,4C
Matter: States, Properties, and Why It All Changes

Solid, liquid, gas — and the difference between a physical and chemical change. Mass conservation, mixtures vs pure substances, and the 5 major reaction types every Regents student must recognize on sight.

Start lesson →
Concept Lesson · 7 min· Massachusetts 5A,5B,5C
Reading the Periodic Table: Trends That Predict Everything

The periodic table isn't a list — it's a predictive engine. Groups, periods, blocks, and the four major trends (atomic radius, ionization energy, electronegativity, metallic character) that the Regents leans on heavily.

Start lesson →
Concept Lesson · 8 min· Massachusetts 6A,6B,6C
Atoms: Subatomic Particles & Electron Configuration

Protons, neutrons, electrons — and the rules that govern where electrons live. Isotopes, the Bohr model, modern orbitals, and how to write the configuration of any element you'll see on the Regents.

Start lesson →
Concept Lesson · 9 min· Massachusetts 7A,7B,7C,7E
Chemical Bonding: Ionic, Covalent, and Molecular Shapes

Why do atoms bond at all? Ionic, covalent, and metallic bonding compared — plus Lewis structures, polarity, VSEPR shapes, and the intermolecular forces that make water wet.

Start lesson →

What's on the 化学 MCAS

Every Massachusetts standard the official exam covers — and the exact topics our practice questions target.

SEMESTER AMassachusetts 1A–6E
  • 1A-3FScientific Processes and Methods
  • 4A-4DMatter
  • 5A-5CPeriodic Table and Periodicity
  • 6A-6EAtoms
  • 7A-7EChemical Bonds
SEMESTER BMassachusetts 7A–11D
  • 8A-8FThe Mole and Stoichiometry
  • 9A-9DSolutions
  • 10A-10DGases
  • 11A-11DThermochemistry
  • 12A-12CNuclear Chemistry
  • OR1-OR6Organic Chemistry
  • RX1-RX6Oxidation-Reduction (Redox)

化学 MCAS — Common Questions

化学 MCAS 考试涵盖哪些主题?

化学 MCAS 涵盖科学过程与实验室安全、原子结构、周期表与周期性、化学键、化学反应与方程式、化学计量、气体定律与溶液、热化学以及核化学入门。每个 Massachusetts 报告类别都会在 A 学期和 B 学期的模拟考试中均匀抽样。

化学 MCAS 难度如何?

考试包含概念记忆(原子结构、化学键类型、周期性趋势)和定量解题(摩尔-质量换算、化学计量、气体定律、溶液摩尔浓度)。约 30–40% 的题目是计算题。在我们的模拟考试中得 80% 以上的学生通常首次参加正式考试就能通过。

化学 MCAS 考试时长多少?

考试约 3 小时,约 50–55 道题。我们的模拟考试在长度和题型分布上完全相同——概念题、基于示意图的题(原子模型、相图)和定量题——让你的节奏练习更精准。

需要背下整个周期表吗?

不需要全部——但你必须熟练掌握其中的规律。MCAS 考试通常会提供周期表参考资料,所以关键是读对:知道金属/非金属/类金属的位置,识别原子半径、电离能和电负性的趋势,并根据族号预测常见离子电荷。

化学 MCAS 有实验部分吗?

没有实操实验,但会有实验室安全、仪器辨识、实验设计和数据解读相关的题目。约 15–20% 的题目考察科学方法理解力——对照、变量、有效数字和图表阅读。

化学 MCAS 需要计算器吗?

需要——允许使用科学计算器或图形计算器,化学计量、气体定律和摩尔浓度题目都会用到。我们的练习题假定考生使用计算器,因此你可以用考试当天将使用的同一种工具来练习。

化学 MCAS 如何评分?

MCAS 以四个表现等级报告成绩——Not Meeting、Partially Meeting、Meeting 和 Exceeding Expectations——而非单一的及格/不及格分数;达到 Meeting Expectations 或以上为目标。建议在全长模拟考试中争取 85% 以上,因为化学计量和气体定律计算题的难度会根据你这次考试所抽取的 Massachusetts 标准有较大波动。