Pure Substances & Mixtures
This type of substance contains only one kind of particle.
What is a pure substance?
When thermal energy is added to a gas, this happens to the speed of its particles.
What is the particles move faster?
Dissolving salt in water tests this type of property.
What is a physical property?
This element is in the same group as sodium and can be used as a substitute in fireworks.
What is lithium?
The mass of reactants and products in a chemical reaction is always this.
What is the same?
Ellie correctly classified Samples A and B as mixtures and Sample C as a pure substance for this reason.
What is Samples A and B contain different substances, and Sample C contains only one substance?
To turn helium gas into a liquid, this must happen to thermal energy.
What is thermal energy must be removed?
Lighting a splint over a gas tests this type of property.
What is a chemical property?
Darnell drew a nitrogen atom with six protons. He should have drawn this many.
What is seven protons?
Heating a solid in an open container may result in a lower mass because of this.
What is gases escaping?
Ice melting in water creates this type of substance.
What is a mixture?
This change occurs when particles move faster and change from a liquid to a gas.
What is evaporation or boiling?
Boiling eggs causes this type of change.
What is a chemical change?
Elements in the same group share these two characteristics.
What are similar electron structures and chemical properties?
The law that states mass cannot be created or destroyed in a chemical reaction.
What is the law of conservation of mass?
A mixture can be separated by physical means, while this type of substance cannot.
What is a compound?
In a sealed container, gas particles at higher temperatures move in this way.
What is in all directions, colliding with the walls and each other?
Mixing eggs with a whisk causes this type of change.
What is a physical change?
This element is not reactive and would not be useful in fireworks.
What is neon?
In a reaction, the number of atoms of each element is the same before and after, meaning this is conserved.
What is mass?
The warm water in a glass after ice melts is considered this type of substance.
What is a pure substance?
Melting chocolate causes molecules to move faster and is considered this type of change.
What is a physical change?
A change that results in a new substance with different properties is called this.
What is a chemical change?
Sodium and lithium are both in this group on the periodic table.
What is Group 1 (alkali metals)?
Shanice and Jalen observed a decrease in mass after heating a solid. This did not break the law of conservation of mass because of this reason.
What is the experiment was done in an open container, allowing gases to escape?