Structure of Atoms
Anything that has mass and takes up space.
What is Matter?
Element's abbreviation; first letter is capitalized and second letter (if it has one) is lowercase.
What is a chemical symbol?
Chemical symbols, coefficients, and subscripts used to represent a chemical reaction.
What is a chemical formula?
Characteristics that help to define or classify a substance - for example - it is shiny and malleable.
What are physical properties?
Process by which the atoms of an original substance rearrange to produce a new substance(s)
What is chemical reaction?
Smallest complete part (building block) of matter.
What is an Atom?
Chemical property that describes the likelihood and rate at which a substance undergoes a chemical reaction.
What is Reactivity?
In a formula, it's the number at lower right of an element's symbol; this number shows how many atoms are present for each element.
What is a subscript?
Can be observed when changes occur that do NOT create a new or different substance
What is physical change?
Chemical reactions that cause or release heat.
What is an exothermic reaction.
Central part of an atom; contains almost the entire mass of an atom.
What is a nucleus?
Number of protons that an element has listed on an element's tile on the Periodic Table.
What is atomic number?
Molecule made of two or more different elements
What is a compound?
In the human digestive system, chewing food into smaller pieces is a ________ change.
What is a physical change?
Gas formation, color change, light produced, odor produced, temperature change, or precipitate (solid) formation is often observed when a new substance(s) is formed during this...
What is evidence of a chemical reaction?
Substance made of only one kind of atom.
What is an element?
Outermost electrons in the electron cloud; it/they determine an elements reactivity.
What are Valence Electrons?
Substance made of two or more atoms - they CAN be the same, but it's not necessary.
What is a molecule?
Observed when a substance changes into a new or different substance
What is a chemical change?
Chemical reactions that absorb heat causing the substance to feel colder.
What is an endothermic reaction.
Part of an atom surrounding the nucleus; consists mostly of empty space in which electrons move.
What is an electron cloud?
Determines the identity of an element; this number also equals the number of electrons in a neutral or stable atom.
What is atomic number? (Or number of Protons)
This is what we call any compound that includes ONLY the following: carbon along with the element(s) hydrogen, oxygen, nitrogen, phosphorus, and/or sulfur.
What is an organic compound? (SPONCH)
When eating, your body changes carbohydrates in your food into simple sugars. This is a _____ change.
What is a chemical change?
Using the substance 5 Mg(SO4)2 name the number of elements, the number of molecules and the number of Oxygen atoms.
What is 3 Elements, 5 Molecules and 40 atoms of Oxygen?