TCAP unit 2 review day 1

Multiple Choice

Why does the student use the oxygen sensor to determine the rate of photosynthesis?

• The plant uses the oxygen as a reactant of photosynthesis.

• The plant releases oxygen as a product of photosynthesis.

Multiple Choice

Which other method besides the oxygen sensor could the student use to determine the rate of photosynthesis, and why?

• Record the growth rate of plant. Plants use food they make during photosynthesis for growth.

• Record the amount of CO2 added to the box. Plants use CO2 in the process of photosynthesis.

• Record the intensity of light in the box. As the amount of light increases, the rate of photosynthesis increases.

Multiple Select

Which two labels should the student add to describe parts of the model? (Pick 2)

• The gray circles are neutrons that have a negative charge.

• The dashed black ring is an orbital and has an overall negative charge.

• The solid black ring is the nucleus, which has an overall neutral charge.

• The white circles are protons and have a positive charge.

• The black circles are electrons and have a neutral charge.

Multiple Choice

Which identifies and explains the contents of the bowl after Activity 2?

• New mixture; it has similar properties to the mixture of iron filings and sulfur.

• New mixture; it has different properties than the mixture of iron filings and sulfur.

• Pure substance; it has similar properties to the mixture of iron filings and sulfur.

• Pure substance; it has different properties than the mixture of iron filings and sulfur.

An element is a substance that is made
from one kind of atom only. It cannot
be broken down into simpler substances.

An element
An element

atom
atom

All atoms of an element are exactly the
same...the same number of protons,
neutrons, & electrons.

A compound is a substance that is made
from more than one element. The
different colors in the compounds below
represent different elements.

atom
atom

A compound made up of
2 different elements

A compound made up of
7 different elements

Each different colored

particle (atom) represents a

DIFFERENT ELEMENT that is part

of the compound in this model.

A compound made up of

3 different elements

Fe

An element’s chemical symbol is
written with either 1 capital
(uppercase) letter or 1 capital and
1 lowercase letter.

H

​OR

Multiple Choice

What element is this? O2

• Oxygen

• Hydrogen

• Carbon

• Onyx

Multiple Choice

What element is this? N2

• Nitrous

• Nitrogen

• Oxygen

• Carbon

Multiple Choice

What element is this? C

• Hydrogen

• Oxygen

• Carbon

• Boron

When two identical elements
combine,this is called an elemental
molecule.

H2 = Hydrogen

F2 = Fluorine

N2 = Nitrogen

Cl2 = Chlorine

O2 = Oxygen

H

H

N

N

O

O

F

F

Cl

Cl

When two identical atoms combine,this
is called an ELEMENTAL MOLECULE.
Because there are TWO of the same
atoms, it can also be called a
DIATOMIC MOLECULE (di = two)

H2 =Hydrogen

Cl2 = Chlorine

H

H

Cl

Cl

A chemical symbol represents a COMPOUND.

To determine whether something is an element or a

compound, all you have to do is count the capital

letters.

If there is more than one capital letter present,

it is a compound!

ELEMENT

Fe
B
Au
Ag
Hg
C

All have only

ONE CAPITAL LETTER

COMPOUND

FeO3
CH4

H2SO4
HNO3
CO2

C6H12O6

All have only MORE THAN

ONE CAPITAL LETTER

Multiple Choice

Is this an element or a compound? Na2O

• Element

• Compound

Multiple Choice

Is this an element or a compound? CuSO4

• Element

• Compound

Multiple Choice

Is this an element or a compound? H2

• Element

• Compound

Multiple Choice

Which model could match the name, hydrogen chloride or HCl?

Multiple Choice

Which model could match the name, Methane or CH4?

Multiple Choice

Which model could match the name, chlorine or Cl2?

Multiple Choice

Which model could match the name, carbon dioxide or CO2?

Both

Elements and Compounds

are

PURE SUBSTANCES

because they CANNOT be
broken down into anything
simpler and still remain the

same substance.