mass, volume, density
The amount of matter in an object.
What is mass?
These have a fixed shape and volume because the molecules in them are vibrating in place and there are strong bonds among the molecules.
What is a solid?
All elements are arranged on this by atomic number, electron configuration, and chemical properties.
What is the periodic table of the elements?
This is the smallest part of an element that still retains all of the chemical properties of that element.
What is an atom?
When two or more substances react with one another and a new, different substance is produced.
What is a chemical reaction?
This makes the weathering of rock into sand a physical change.
What is a change in size and shape, but not a change in substance?
A property of a substance that does not change if the sample size changes.
What is a characteristic property?
The reason grass feels cool under our feet on a hot day.
What is that photosynthesis is an endothermic reaction?
How tightly packed the matter in an object is.
What is density?
These have a fixed volume, but not a fixed shape because the molecules are moving around one another and are attracted to one another, but not strongly.
What is a liquid?
These are found on the far left side of the periodic table and are highly reactive because they have only one valence electron.
What are the alkali metals?
Two or more atoms that are chemically bonded.
What is a molecule?
A chemical reaction when more energy is released as new bonds form in the products than is required to break the bonds in the reactants.
What is an exothermic reaction?
This makes the melting of ice into liquid water a physical change.
What is a phase change.
Freezing/melting point and boiling/condensing point are examples of this. So are density, malleability, and ductility.
What are characteristic properties?
The organelles where photosynthesis and cellular respiration occur.
What are the chloroplasts (photosynthesis) and the mitochondria (cellular respiration)?
mass divided by volume
How do you find the density of an object?
These have neither a fixed shape nor a fixed volume because the molecules are not attracted to one another at all and are moving independently and quickly.
What is a gas?
These are found on the far right side of the periodic table and are highly inert because they have a full valence shell.
What are the noble gases?
This is created when two or more different types of atoms are bonded together into molecules.
What is a compound?
A chemical reaction that cools off the surrounding area.
What is an endothermic reaction?
These are the signs of a physical change.
What are changes in size, shape, and phase?
Two things that characteristic properties help us to do.
What are identify unknown substances and understand how to use substances?
The reason a burning candle gives off heat and light.
What is because combustion is an exothermic reaction?
This can be calculated by submerging an object in water and measuring the amount of water that is displaced.
How do you find the volume of an irregular object?
The transfer of this into a substance will cause the molecules in the substance to move more quickly, to move farther apart, and to have less attraction to one another.
What is thermal energy?
This is a large group of elements found in the center of the periodic table. They are known for being excellent conductors of heat and electricity and are both malleable and ductile.
What are the transition metals?
This is created when there is only one type of atom or molecule in a substance. Examples of this are water, salt, sugar, and iron.
What is a pure substance?
The chemicals on the left side of a chemical equation.
What are the reactants?
The baking of a plain sugar cookie is only a chemical reaction, but the baking of a chocolate chip cookie is an example of both a physical change and a chemical reaction.
Why does the baking of cookie dough create a new substance, but the melting and re-freezing of the chocolate chips is a phase change.
These characteristic properties of metals help us to know how we can shape them.
What are malleability and ductility?
Organisms that carry out photosynthesis.
What are producers?
These are measured using a balance and a scale, respectively.
How do you measure mass and weight?
Thermal energy is transferred in these three ways.
What are conduction, convection, and radiation?
This number will tell you the number of protons in an atom of a particular element.
What is the atomic number?
This is created when two or more different types of atoms or molecules are mixed together, but they do not chemically bond. Examples of this are air, blood, milk, and salt water.
What is a mixture?
This states that the number and types of atoms in the reactants must equal the number and types of atoms in the products.
What is the Law of Conservation of Mass?
The reason that mixing paint colors is a physical change.
Because no new substance is formed.
The reason that a large log and a small log cut from the same tree will float at the same level.
What is because density is a characteristic property?
Organisms that carry out cellular respiration.
What are all organisms?