Which of the following statements is true?

Compounds are pure substances because each molecule has the same fixed composition.

Compounds are not pure substances because they are composed of two or more elements.

Compounds are pure substances because they contain only one element

Compounds are not pure substances because they can be decomposed.

In a scientific explanation, the reasoning is/are the _________________________________.

scientific principles, measurements, formulas that describe why the evidence supports the claim

observations, data tables, graphs and pictures that support the explanation

statement that answers a question

How is a hypothesis tested?

By proposing an explanation to a question

Which of the following sentences is part of the evidence in the explanation given above?

However, each has a different mass and density.

Four objects of the same size can have different masses because matter is packed together more tightly in some materials than in others.

The Atomic Theory tells us that matter is made mostly of empty space, but that atoms with a larger nucleus will be smaller and have more mass

This allows smaller atoms with more mass to pack more matter into a volume then larger, less massive atoms.

A chemistry teacher places a piece of lithium (a dull grey metal) in water during a class demonstration. The lithium reacts vigorously with the water. After the reaction, the lithium appears to be gone. The teacher boils off the remaining water and all that is left is a white crystalline powder, which is most likely:

a compound made from the lithium and hydrogen and oxygen from the water chemically bonded to each other

a new element that is neither lithium nor water

a mixture of lithium, oxygen and hydrogen

a powdered form of the element lithium

What is the formula for density?

D = m ÷ V D=m\div V D = m ÷ V

D = m × V D=m\times V D = m × V

V = L × W × H V=L\times W\times H V = L × W × H

Which of the following was not one of the five statements included in John Dalton’s Atomic Theory?

Atoms are composed of a nucleus of nucleons surrounded by an electron cloud.

Atoms of a given element are identical in size, mass, and other properties. Atoms of different elements differ in size, mass, and other properties.

Atoms of different elements can combine in simple whole number ratios to form chemical compounds.

In chemical reactions, atoms are combined, separated, or rearranged.

Why is the average atomic mass listed on the periodic table different from the actual atomic mass of the element?

the average atomic mass is calculated using the masses of each naturally occurring isotope

the average atomic mass is calculated using the mass defect of the nuclei

the average atomic mass is calculated using the masses of the electrons

the average atomic mass is calculated using more accurate measurements

Which of the following is true according to Bohr's model of the atom?

electrons orbit the nucleus in definite orbits

electrons do not orbit the nucleus

electrons orbit the nucleus in orbits at any distance from the nucleus

According to Bohr's model of the atom:

electrons absorb energy when they move from a lower energy level to a higher energy level

electrons in an atom can have any amount of energy

electrons can switch from one energy level to another by trading energy with other electrons

electrons release photons when they are excited from one enegry level to a higher one

According to Bohr’s theory, atoms emit specific light spectra because:

electrons relax from one energy state to another and release that amount of energy as a photon

each atom has electrons of certain energies that produce specific photons

electrons excite from one energy state to a higher one and release that amount of energy as a photon

they are trying to get rid of excess heat

The biggest problem with the Bohr's model of the atom is that:

it doesn't work for anything but hydrogen

it doesn't accurately explain any photons emitted by atoms

it doesn't explain why the electrons orbit in circles

The picture shows the nuclear notation and Bohr model of an atom of Boron-10. The nuclear notation is correct, but there are two errors on the Bohr model. Select the two errors from the list below.

Electrons placed in wrong order

The picture shows the nuclear notation and Bohr model of an atom of Nitrogen-15. The nuclear notation is correct, but there are two errors on the Bohr model. Select the two errors from the list below.

Electrons placed in wrong order

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Hard

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NGSS

HS-PS1-2, HS-PS1-8, MS-PS1-2

+12

Standards-aligned

Bryan Forney

Used 6+ times

FREE Resource

50 questions

Show all answers

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is one of the Expectations of Behavior?

Be Respectful

Be Quiet

Don't Play on Your Phone

Be a Leader

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A tells what is going to happen, while a _ tells you how or why it happened.

theory, law

law, theory

hypothesis, theory

law, hypothesis

Tags

NGSS.HS-PS2-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The state of matter with relatively high heat, indefinite volume and indefinite shape is ___________.

solid

liquid

gas

plasma

Tags

NGSS.HS-PS3-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which diagram best shows the particles in a liquid?

Tags

NGSS.HS-PS1-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The state matter is in tells you something about how much _____________ the particles in the matter have.

power

potential energy

density

kinetic energy

Tags

NGSS.HS-PS3-2

NGSS.HS-PS3-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A student is given a sample of matter and asked to determine whether it is an element, compound, or mixture. The student discovers that he cannot separate the components physically, but he is able to separate it using chemical reactions into three different pure substances. The sample must be ______________________.

an element

a compound

a solution

a mixture

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The word alloy goes in which position on the Types of Mixtures flowchart?

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Chemistry Semester 1 Review & Exam

50 questions

Which of the following is one of the Expectations of Behavior?

A tells what is going to happen, while a _ tells you how or why it happened.

The state of matter with relatively high heat, indefinite volume and indefinite shape is ___________.

Which diagram best shows the particles in a liquid?

The state matter is in tells you something about how much _____________ the particles in the matter have.

The word alloy goes in which position on the Types of Mixtures flowchart?

What word goes in the space marked E on the Types of Mixtures flowchart?

A change that produces matter with a different composition is called a _____.

Which of the following statements is true?

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Chemistry Semester 1 Review & Exam

50 questions

Which of the following is one of the Expectations of Behavior?

A __________ tells what is going to happen, while a ___________ tells you how or why it happened.

The state of matter with relatively high heat, indefinite volume and indefinite shape is ___________.

Which diagram best shows the particles in a liquid?

The state matter is in tells you something about how much _____________ the particles in the matter have.

The word alloy goes in which position on the Types of Mixtures flowchart?

What word goes in the space marked E on the Types of Mixtures flowchart?

A change that produces matter with a different composition is called a _____.

Which of the following statements is true?

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A tells what is going to happen, while a _ tells you how or why it happened.