The difference between a strong acid and a weak acid in terms of pH is:

Strong acids have a lower pH than weak acids.

Weak acids have a lower pH than strong acids.

pH does not depend on acid strength.

The difference between a permanent magnet and an electromagnet is:

A permanent magnet produces a constant magnetic field, while an electromagnet requires electric current to produce a magnetic field.

A permanent magnet needs electricity to work, while an electromagnet does not.

Both are the same and work in the same way.

An electromagnet is always stronger than a permanent magnet.

A neutralization reaction occurs when:

an acid reacts with a base to form salt and water

a base reacts with a metal to form hydrogen gas

an acid reacts with a metal to form salt and hydrogen gas

a salt reacts with water to form an acid and a base

Electricity creates a magnetic field because:

moving electric charges generate a magnetic field.

magnetic fields cause electricity to flow.

electricity and magnetism are unrelated.

Which statement best compares and contrasts ionic, covalent, and metallic bonding in terms of electron behavior and the types of elements involved?

Ionic bonds involve transfer of electrons between metals and nonmetals; covalent bonds involve sharing of electrons between nonmetals; metallic bonds involve a 'sea of electrons' among metal atoms.

Ionic bonds involve sharing of electrons between nonmetals; covalent bonds involve transfer of electrons between metals and nonmetals; metallic bonds involve a 'sea of electrons' among nonmetals.

Ionic bonds involve a 'sea of electrons' among metals; covalent bonds involve transfer of electrons between nonmetals; metallic bonds involve sharing of electrons between metals and nonmetals.

Ionic bonds involve sharing of electrons between metals; covalent bonds involve a 'sea of electrons' among nonmetals; metallic bonds involve transfer of electrons between metals and nonmetals.

The Right-Hand Rule in electromagnetism is used to determine:

The direction of magnetic field, current, or force

The magnitude of electric charge

Which of the following are safety rules when working with acids and bases in the lab?

Always wear protective gear and work in a well-ventilated area.

Taste the chemicals to identify them.

Mix acids and bases with bare hands.

Ignore spills and clean them later.

Litmus paper and phenolphthalein are used to identify acids and bases. Which of the following statements is correct?

Litmus paper turns red in acids and blue in bases; phenolphthalein is colorless in acids and pink in bases.

Litmus paper turns blue in acids and red in bases; phenolphthalein is pink in acids and colorless in bases.

Litmus paper turns green in acids and yellow in bases; phenolphthalein is yellow in acids and green in bases.

Litmus paper and phenolphthalein do not change color in acids or bases.

Electronegativity increases across a period but decreases down a group because:

Atomic radius decreases across a period and increases down a group, affecting the attraction for electrons.

Atomic number decreases across a period and increases down a group.

Number of protons decreases across a period and increases down a group.

Electron shielding decreases down a group and increases across a period.

Trimester 3 Exam - Science 7

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Trimester 3 Exam - Science 7

Quiz

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Science

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7th Grade

•

Practice Problem

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Easy

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NGSS

HS-PS2-5, HS-PS1-1, MS-PS1-5

Standards-aligned

Kayla Scardaccione

Used 13+ times

FREE Resource

True

False

Directions: True or False (10 points) Mark (A) for TRUE and (B) for FALSE on the scantron. 17. ___ Bases feel slippery to the touch.

True

False

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Trimester 3 Exam - Science 7

39 questions

Acids turn red litmus paper blue.

Opposite magnetic poles repel each other.

Water is neutral because it has a pH of 7.

pH 13 is a strong base.

The pH scale ranges from 1 to 20.

Electromagnetic induction can create electricity.

Directions: True or False (10 points) Mark (A) for TRUE and (B) for FALSE on the scantron. 17. ___ Bases feel slippery to the touch.

Electronegativity increases from left to right across a period.

Metals have high electronegativity.

A stronger electromagnet can be made by increasing the number of coils.

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