|
|
3429 |
ActivationEnergy |
The activation energy of a chemical reaction is the amount of energy in a molecular collision needed to make the molecules react. |
0 |
Ready |
Edit
|
|
|
3432 |
Atom |
An atom consists of a nucleus consisting of at least one proton and possibly neutrons, surrounded by electrons. |
0 |
Ready |
Edit
|
|
|
3430 |
AtomElement |
An atom is the smallest amount of a chemical element that demonstrates the properties of that element. |
0 |
Ready |
Edit
|
|
|
3431 |
AtomicNumber |
The number of protons in an atom is the atom's atomic number. |
2 |
Ready |
Edit
|
|
|
3435 |
BondedAtomsLessEnergy |
Bonded atoms have less energy than the same atoms unbonded. |
0 |
Ready |
Edit
|
|
|
3433 |
BondingElectrons |
Many chemical bonds involve the atom's outer electrons. |
0 |
Ready |
Edit
|
|
|
3484 |
BreakBondRequireEnergy |
Breaking a chemical bond requires energy. |
0 |
Ready |
Edit
|
|
|
3436 |
ChemicalBond |
A chemical bond is an attraction between two or more atoms or ions. |
0 |
Ready |
Edit
|
|
|
3437 |
ChemicalChange |
A chemical change creates a new substance or substances. |
0 |
Ready |
Edit
|
|
|
3477 |
ChemicalElement |
A chemical element, or element, is a chemical substance consisting of atoms having the same number of protons. |
0 |
Ready |
Edit
|
|
|
3483 |
ChemicalEquation |
A chemical equation represents a chemical reaction as a list of reactant atoms, ions, and molecules on the left side, an arrow, and a list of products on the right side. Reactants and products are represented by their chemical formulas, prefixed by a number describing the number of that entity taking part in the reaction, and separated by addition symbols. |
1 |
Ready |
Edit
|
|
|
3482 |
ChemicalFormula |
A substance's chemical formula describes the proportions of atoms in a substance, or numbers of atoms in a molecule of the substance. |
0 |
Ready |
Edit
|
|
|
3513 |
ChemicalProperties |
Chemical properties are properties of a substance that are associated with the change of the substance into another substance(s). |
0 |
Ready |
Edit
|
|
|
3438 |
ChemicalReaction |
A chemical reaction is a rearrangement of atoms among atoms, molecules, and ions in which the number of each type of atom does not change. Here, a "type of atom" is an atom with a particular number of protons and a particular number of neutrons. |
0 |
Ready |
Edit
|
|
|
3439 |
ChemicalSubstance |
A chemical substance, or substance, is an amount of matter having a constant composition. |
0 |
Ready |
Edit
|
|
|
3478 |
CollisionEnergyTemp |
The energy of molecular collisions increases with temperature. |
0 |
Ready |
Edit
|
|
|
3470 |
CollisionFreqActivationTemp |
The frequency of collisions that exceed the activation energy for the reaction increases with temperature. |
1 |
Ready |
Edit
|
|
|
3471 |
CollisionFreqTemp |
The frequency of molecular collisions increases with temperature. |
0 |
Ready |
Edit
|
|
|
3440 |
CovalentBond |
A covalent bond is a chemical bond in which two or more atoms share electrons. |
0 |
Ready |
Edit
|
|
|
3441 |
CovalentNonmetals |
Bonds between nonmetals are typically covalent. |
0 |
Ready |
Edit
|
|
|
3442 |
Crystal |
A crystal is a network of atoms of the same or different types held together by chemical bonds. |
0 |
Ready |
Edit
|
|
|
3517 |
Density |
Density is the ratio of a substance's mass to its volume. The SI unit for density is $\frac{\textrm{kg}}{\textrm{m}^3}$. |
0 |
Ready |
Edit
|
|
|
3515 |
Ductility |
Ductility is the ability of a substance to be deformed under tension without fracturing. |
0 |
Ready |
Edit
|
|
|
3443 |
EightOuterElectrons |
Elements of groups 1, 2, 13, 14, 15, 16, and 17 bond to attain zero or eight, or share eight, outer electrons. |
3 |
Ready |
Edit
|
|
|
3473 |
ElectronNegative |
The charge on an electron is the same size as the charge on a proton, but negative. |
2 |
Ready |
Edit
|
|
|
3480 |
ElementStyle |
Elements, or atoms of elements, have corresponding one- or two-letter symbols. |
0 |
Ready |
Edit
|
|
|
3446 |
Endothermic |
An endothermic reaction absorbs energy from the surroundings. |
0 |
Ready |
Edit
|
|
|
3447 |
Exothermic |
A exothermic reaction releases energy to the surroundings. |
0 |
Ready |
Edit
|
|
|
3479 |
FormulaStyle |
In a chemical formula, atoms or elements are represented by their symbols, subscripts multiply entities to the immediate left, and parenthesis group atoms. |
1 |
Ready |
Edit
|
|
|
3448 |
Group18Inert |
The group 18 elements bond only with difficulty. |
0 |
Ready |
Edit
|
|
|
3449 |
GroupOuterElectronCount |
Neutral atoms of group 1 elements have 1 outer electron; group 2, 2 outer electrons; group 13, 3; group 14, 4; group 15, 5; group 16, 6; group 17, 7, and group 18, 8. |
3 |
Ready |
Edit
|
|
|
3452 |
GroupSameOuterElectrons |
The elements in periodic table groups have the same number of outer electrons. |
0 |
Ready |
Edit
|
|
|
3450 |
GroupsGainElectrons |
Atoms of groups 15, 16, and 17 tend to bond by gaining electrons from other atoms. |
3 |
Ready |
Edit
|
|
|
3451 |
GroupsLoseElectrons |
Atoms of groups 1, 2, and 13 elements tend to bond by losing their outer electrons to other atoms. |
3 |
Ready |
Edit
|
|
|
3453 |
GroupsProperties |
The elements in periodic table groups have similar chemical properties. |
0 |
Ready |
Edit
|
|
|
3454 |
Ion |
An ion is a charged atom or group of atoms. |
0 |
Ready |
Edit
|
|
|
3455 |
IonicBond |
An ionic bond is a chemical bond in which one or more electrons are transferred from one atom to another. |
0 |
Ready |
Edit
|
|
|
3456 |
IonicMetalNonmetal |
Bonds between metals and nonmetals are typically ionic. |
0 |
Ready |
Edit
|
|
|
3481 |
IonStyle |
An ion is represented by the symbol for the element(s) in the ion, accompanied by a right-hand superscript giving the ion's charge. |
0 |
Ready |
Edit
|
|
|
3434 |
MakeBondReleaseEnergy |
Formation of a chemical bond releases energy. |
0 |
Ready |
Edit
|
|
|
3516 |
Malleability |
Malleability is the ability of a substance to deform under compression without fracturing. |
0 |
Ready |
Edit
|
|
|
3457 |
MassNumber |
The sum of the number of protons and neutrons in an atom is the atom's mass number. |
1 |
Ready |
Edit
|
|
|
3458 |
MetalProperties |
Metals tend to be lustrous, ductile, malleable, good conductors of heat and electricity, solid at room temperature, and have a high density. |
1 |
Ready |
Edit
|
|
|
3459 |
Molecule |
A molecule is two or more atoms of the same or different types held together by chemical bonds. |
0 |
Ready |
Edit
|
|
|
3460 |
NeutralAtomElectrons |
A neutral atom has the same number of electrons as protons. |
1 |
Ready |
Edit
|
|
|
3475 |
NeutralNoCharge |
An object having no electrical charge is neutral. |
0 |
Ready |
Edit
|
|
|
3474 |
NeutronNeutral |
A neutron is electrically neutral. |
1 |
Ready |
Edit
|
|
|
3512 |
ObjectCharge |
The charge on an object is the sum of the charges on its protons, neutrons, and electrons. |
0 |
Ready |
Edit
|
|
|
3461 |
PeriodicTableGroups |
In the periodic table, columns of elements are called groups. |
0 |
Ready |
Edit
|
|
|
3462 |
PeriodicTablePeriods |
In the periodic table, rows of elements are called periods. |
0 |
Ready |
Edit
|