Element, Compound or Mixture?
This group of metallic elements is known for being highly reactive and includes lithium, sodium, and potassium
What are alkali metals (group one)?
This particle, found in the nucleus, carries a positive charge and has a mass of approximately 1 atomic mass unit (amu).
What is a proton?
This physical property describes a substance's ability to be drawn into wires without breaking.
What is ductility?
This type of reaction involves the release of energy, often in the form of heat or light.
What is an exothermic reaction?
Don't chuckle!! Nitrous oxide commonly goes by this name.
What is laughing gas?
This is the only metal that is liquid at room temperature
What is mercury?
The mass number of an atom is the sum of its protons and these particles.
What are neutrons?
This physical property is defined as the amount of mass per unit volume of a substance.
What is density?
This solid is sometimes formed during a chemical reaction between two liquids.
What is a precipitate?
What is toxicity?
This type of mixture has a composition that is NOT uniform throughout and includes substances like mixed nuts or vegetable soup
What is a heterogeneous mixture?
In a neutral atom, the number of these subatomic particles is equal to the number of protons.
What are electrons?
When ice melts into water, this type of physical change occurs.
What is a change in state (of matter)?
This chemical property describes a substance's ability to react with oxygen, often resulting in combustion.
What is flammability?
What is baking soda?
Based on its periodic table placement, helium should have ___ valence electrons. In reality, because helium is an exception, it only contains ___ valence electrons.
What are 8 and 2?
This element appears to be out of place because it is a nonmetal that is in a group with highly reactive metals.
What is hydrogen?
This physical property indicates how easily a substance can be dissolved in a solvent.
What is solubility?
This chemical property indicates a substance's ability to undergo a chemical reaction, such as rusting or tarnishing.
What is reactivity?
These are the three most common elements found in the human body.
What are oxygen (65%), carbon (18%), and hydrogen (9.5%)?
This is a homogeneous mixture, or a solution, even though it is also a solid.
What is steel?
The number of electron shells in an atom corresponds to this periodic table feature.
What is the period?
This physical property measures a substance's resistance to flow and is important in characterizing liquids.
What is viscosity?
This term describes a substance that changes from a solid directly to a gas without passing through the liquid phase.
What is sublimation?
What are europium and einsteinium?