creates something new and you can't undo the change

What does the law of conservation of mass state?

Matter cannot be created or destroyed

What is the structure of an atom?

Negatively charged electrons orbit protons

How is a compound different from an element?

An Element contains only one type of atom

What are the limitations of models?

a model is never exactly the same as the thing it represents

Which statement about atoms and molecules is correct

elements and compounds can exist as molecules

What is this model showing?

It shows two different types of atoms combining to form a compound.

What is the closest definition to an "atom"?

The smallest unit in an element.

How are elements in the periodic table organized?

Based on physical and chemical properties

One limitation of this model is_____.

It does not show the real size of 2 different of atoms

How do scientists and engineers use scientific models differently?

Scientists-predict how the system changes Engineers-design & test solutions

Empirical evidence is...

based on scientific facts and findings

studbud

Matter, Atomic Theory and NOS

31 termsStudBud Administration223 plays

Eight Grade Science Ms. Perez

Flashcards31 cardsFPractice quizPHost liveL

Questions 31

Answers

1
What is the pH scale for acids?
Less than 7
Greater than 7
7 to 14
2
Does the following represent a chemical or physical change?
Chemical
Physical
Both
3
A chemical change
creates a new substance and you can undo the change
creates something new and you can't undo the change
doesn't create anything new, but you cannot go back
doesn't create anything new, but you can undo it
4
Does the following represent a chemical or physical change?
Chemical
Both
Physical
5
A pure substance can be...
a compound
both
neither
an element
6
What does the law of conservation of mass state?
Mass is the name for the density of a living thing
You can only destroy matter through high heat
Matter cannot be created or destroyed
Mass is the small particles that make everything
7
What is the structure of an atom?
Negatively charged electrons surround the nucleus as a cloud
Negatively charged electrons orbit protons
Positively charged protons orbit electrons
Negatively charged particles in a soup of positive charges.
8
The scale to measure acids and bases is called the __________.
acidic scale
radiographic scale
hydograph
pH Scale
9
What is a scientific model?
a representation of an object
a type of car
a person who poses for pictures
something you eat
10
What pH values are given to STRONG ACIDS?
8 - 11
0 - 2
12 - 14
3 - 6
11
How is a compound different from an element?
Compounds combine elements without a chemical reaction
The atoms in a compound contain the same number of isotopes
The molecules in a compound contain only one element
An Element contains only one type of atom
12
The periodic table has vertical columns called ________
Periods
Rows
Groups/ families
Tables
13
What are the limitations of models?
a model is smaller than the thing it represents
a model includes every factor that affect it
all models are two-dimensional
a model is never exactly the same as the thing it represents
14
which of these must be supported by empirical evidence?
observation
opinion
theory
fieldwork
15
Which statement about atoms and molecules is correct
elements and compounds can exist as molecules
Compounds can exist as individual atoms
elements always exist as separate atoms
elements always exist as pairs of atoms called molecules
16
What is the Atomic Number
80
56
137.327
136
17
This atoms has ____ protons___ neutrons and ___ electrons.
4, 5, 6
6, 5, 4
2, 5, 7
-1, +4, - 2
18
The images below show substances of different states of matter; A is a ____, B is a _____ and C is a _____
liquid, gas, solid
solid, liquid or gas
plasma, solid, liquid
gas, liquid, solid
19
What is this model showing?
It shows a compound going through a chemical change
It shows two different types of atoms combining to form a compound.
This is showing a physical change of a compound.
It shows how elements separate to form pure molecules.
20
What is the closest definition to an "atom"?
A unit of measurement.
The biggest unit in an element.
A unit of study.
The smallest unit in an element.
21
How are elements in the periodic table organized?
Increasing number of electrons
Based on physical and chemical properties
Alphabetically
Most reactive to least reactive
22
Does the following represent a chemical or physical change?
Physical
Both
Chemical
23
One limitation of this model is_____.
It is not clear what is happening.
It does not show the real size of 2 different of atoms
It does not show the final result
This model is perfect and the same as the real thing.
24
According to the scientific theory of atoms (atomic theory), _______.
all matter is made of atoms.
elements are atoms
atoms are made of matter
the density of all types of matter is the same.
25
The horizontal rows in a periodic table are called
Family
Periodical
Period
Group
26
By what process can compounds be broken down?
physical change
either physical or chemical change
compound change
chemical change
27
How do scientists and engineers use scientific models differently?
Scientists form hypotheses, Engineers try to prove theories with models
Scientists- physical models Engineers-use conceptual models
Scientists-predict how the system changes Engineers-design & test solutions
Scientists try to test solutions, Engineers try to form hypotheses
28
Empirical evidence is...
based on scientific facts and findings
based on common sense
based on a personal story
29
Which elements make up the compounds in the image?
carbon, oxygen, hydrogen
methane, carbon dioxide, water
water, oxygen
no elements are involved
30
Classify properties in order as physical or chemical.
Chemical, Chemical, Physical
Chemical, Physical, Chemical
Chemical, Physical, Physical
Physical, Chemical, Physical
31
Strong acids, like hydrochloric acid, generally have ___
pHs in the 8 to 11 range
very low pHs
very high pHs
pHs in the 4 to 6 range

Matter, Atomic Theory and NOS Flashcards | StudBud