Lab Safety
This type of protective equipment should always be worn to keep chemicals from splashing into your eyes.
What are goggles?
These are the three main subatomic particles.
What are protons, neutrons, and electrons?
The electrons in the outermost energy level.
What are valence electrons?
Vertical columns on the periodic table are called this.
What are groups?
This nuclear process powers the sun.
What is fusion?
A reaction that releases heat is called this.
What is exothermic?
The number of protons in an atom determines this identity.
What is the element?
Food and drinks are not allowed in the lab because they may do this.
What is accidentally ingest chemicals?
The subatomic particle with a negative charge.
What is an electron?
The first energy level can hold this many electrons.
What is 2?
Group 1 elements are known as this family.
What are alkali metals?
A large atom splits into smaller atoms during this process.
What is fission?
In an endothermic reaction, energy does this.
What is absorbed?
This is found by rounding the atomic mass and subtracting the atomic number.
What is the number of neutrons?
Before using a chemical, you should always check this on the bottle.
What is the label?
Nearly all the mass of an atom is found in this area.
What is the nucleus?
Group 1 elements will do this to reach stability.
What is lose one electron?
Elements in Group 18 do not react because they already have this.
What is 8 valence electrons?
A proton turns into a neutron during this type of decay.
What is beta-positive decay?
In an exothermic reaction, energy does this.
What is released?
This model of the atom arranges electrons in energy levels around the nucleus.
What is the Bohr model?
When reading a graduated cylinder, your eyes should be here.
What is at eye level?
The area where electrons are found, and where most of an atom’s volume is.
What is the electron cloud?
Valence electrons are the driving force behind these.
What are chemical reactions?
Elements on the stair-step line are called this.
What are metalloids?
A neutron turns into a proton during this type of decay.
What is beta-negative decay?
When new bonds are formed, energy is released, so the reaction feels like this.
What is hot?
This element has six valence electrons in its dot diagram.
What is oxygen? (or Sulfur, Selenium, Te, Po or Lv)
If a reaction feels cold, it is this type of reaction.
What is an endothermic reaction?
Models of atoms are useful, but have this major drawback.
What is they cannot accurately show all details at once?
When hydrogen reacts with active metals, it forms a bond by doing this.
What is gaining one electron?
Most metals are in this state of matter at room temperature.
What is solid?
When 2 protons and 2 neutrons are emitted, the reaction is called this.
What is alpha decay?
Ice melting on a sidewalk is this type of reaction.
What is endothermic?
A student claims a chemical reaction occurred because the mixture changed color — but this color change is not evidence of a chemical change unless this also happens.
What is the formation of a new substance?
This is the reason most atoms form chemical bonds and react with other atoms.
What is to achieve a full outer energy level (8 valence electrons)?