WorksheetsFlame method Lab
Total questions: 34
Worksheet time: 22mins
When electrons change energy levels, when is light emitted?
When the electrons jumps to a higher energy level.
When an electron falls back to the ground state.
When the electrons jump to the excited state.
When electrons are resting.
When an atom _______________ _____________, its electrons can use this energy to move to a higher energy level.
releases energy
absorbs energy
emits radiation
gets rid
Light is emitted when electrons
move from one atom to another.
collide with one another, releasing energy.
move from a lower energy level to a higher energy level.
move from a higher energy level to a lower energy level.
Look carefully at the picture. It shows an electron in the excited state on the left, and the electron returning to its ground state on the right. When the electron return to the ground state it emits a_______________________.
blast of cold air
electrostatic charge
proton
photon (light)
Which image shows the lower energy light released?
When an electron transitions from a low energy level to a high energy level, the electron...
absorbs energy and moves away from the nucleus
emits energy and moves closer to the nucleus
absorbs energy and moves closer to the nucleus
emits energy and moves away from the nucleus
When an electron transitions from a high energy level to a low energy level...
the electron emits light of a specific wavelength and moves closer to the nucleus
the electron emits light of a specific wavelength and moves away from the nucleus
the electron absorbs energy and moves away from the nucleus
the electron emits light of a random wavelength and moves closer to the nucleus
When heated, electrons are ____________.
annoyed
irritated
excited
angered
What is the lowest energy state of an atom?
atomic orbital
excited state
electron
ground state
How can you identify a salt when analyzing a chemical reaction?
a salt only contains cations
It always contains Na+ and Cl- ions
any metal cation combined with a nonmetal anion
a salt always has OH- ions
In a bond between sodium and chlorine, which loses its valence electrons and why?
sodium, because it is a metal
chlorine, because it is a metal
sodium, because it is a nonmetal
chlorine, because it is a nonmetal
Ionic compounds are compounds formed by a bond between
a metal and another metal atoms
a metal and a nonmetal atoms
two nonmetals atoms
a metal and polyatomic ions
Will the following element lose or gain electron? How many will it lose or gain?
gain 1 electron
gain 2 electrons
lose 1 electron
lose 2 electrons
Determine whether the following element will form a cation or anion
Phosphorus (with 5 valence electrons)
cation
anion
Determine whether the following element will form a cation or anion
Boron (with 3 valence electrons)
cation
anion
Determine whether the following element will form a cation or anion
Sulfur (with 6 valence electrons)
cation
anion
These are negatively charged ions.
cations
anions
These are positively charged ions.
cations
anions
Which part of the Bunsen flame is the hottest?
A
B
C
D
Which is the hottest part in the flame of the candle
Yellow
Wax part
Black
Blue
there are following zones of a flame
Two
Three
Four
No any zone
Combustion is a reaction in which a substance reacts with
hydrogen
Nitrogen
Oxygen
Chlorine
You are heating a substance in a test tube. Always point the open end of the tube
toward yourself
toward your lab partner
toward another classmate
away from all people
How do electrons become excited?
Emitting light/energy
Absorbing light/energy
Going down an orbital/energy level
Going up an orbital/energy level
In the picture, Which of these represents electrons?
A
B
C
D
What particles in the heated compounds are responsible for the production of the colored light?
proton
neutron
electron
proton and neutron
What is the state when electrons move to a higher energy level upon absorption of energy?
active
inactive
excited
ground
Which option below best describes the substances in each tray?
Pure substance - element
Pure substance - compound
Mixture of element & compound
Mixture of elements
A fellow student of yours thought that flame color was based on the element written at the end of the compound. Which statement would give evidence to support their claim?
The flames of LiCl and and NaCl are the same color
The flames of LiCl and NaCl are different colors
The flames of Na2SO4 and NaCl are different colors
The flames of Na2SO4 and CuCl2 are different colors
A fellow student of yours thought that flame color was based on the element written at the beginning of the compound. Which statement would give evidence to support their claim?
The flames of LiCl and and NaCl are the same color
The flames of LiCl and NaCl are different colors
The flames of Na2SO4 and NaCl are different colors
The flames of Na2SO4 and CuCl2 are different colors
Why is it necessary to put the elements in the fire in order to see their colors?
To excite their electrons, causing them to emit characteristic colors.
The fire burns the splint.
The colors are visible due to the heat of the fire.
