Is It Physical… or Nah?
how many substances join to form new chemical properties.
two or more
Atoms are not destroyed during chemical reactions — they are this.
What is rearranged?
Fireflies flash slower in cold weather because this factor affects reaction rates.
What is temperature?
When an atom loses an electron, it becomes this type of ion.
What is a positive ion?
This scientist proposed atoms were solid spheres.
Who is John Dalton?
the parts of the atom spinning around the outside of the nucleus are called
electrons
what is the difference between a physical change and chemical change
A chemical change there is a change in the substance and in physical change there is a difference in the appearance
changing the state of matter, changing the shape, changing the texture and changing the color our what change
physical change
Increasing this makes particles collide more often.
What is temperature?
This model shows electrons in energy levels.
What is a Bohr model?
This experiment proved atoms have a small, dense nucleus.
What is the gold foil experiment?
neutrons have what type of charge
What is neutral
Evidence of this change includes a change on odor (smell),change in color,the formation of bubbles,light or heat given off is what type of change?
What is a Chemical change?
Two or more atoms bonded together form this.
What is a molecule?
Which factor does NOT speed up a reaction: surface area, temperature, concentration, or color?
What is color?
This diagram shows ONLY valence electrons.
What is a Lewis dot diagram?
This model introduced electrons embedded in positive matter.
What is the plum pudding model?
This number tells you how many protons an atom has.
What is the atomic number?
when there is a chemical change the atoms in the substance do what
break apart and reconnect in a different formation
H₂O is BOTH a molecule and this.
What is a compound?
Chemical reactions do this to atoms.
What is rearrange them?
The BEST diagram to predict bonding.
What is a Lewis dot diagram? Remains the same.
Atomic models change over time because of this.
What is new experimental evidence?
These particles are responsible for chemical bonding.
What are electrons?
The BEST sign that a chemical change occurred
What is the formation of a new substance?
Words that describe the ability of a substance to change into new and different matter
What are chemical properties?
This reaction type follows the pattern A + BC → AC + B.
What is a single-replacement reaction?
How many dots should oxygen have in a Lewis diagram?
What is 6?
atoms are made of what three things
protons, neutrons & electrons
Elements in the same group behave similarly because they share this.
What are the same number of valence electrons?