Matter and Changes
This is anything that has mass and takes up space
What is Matter?
The SI unit for length
What is the Meter?
The positively charged particle found in the nucleus.
What is a proton?
Elements in the same vertical column are called this.
What are groups
A bond formed by sharing electrons.
What is a covalent bond?
Melting ice into liquid water is an example of this type of change
What is a physical change?
The instrument commonly used to measure mass in a laboratory.
What is a balance?
The number of protons in an atom.
What is the atomic number?
These elements are found on the far left side of the periodic table and have one valence electron.
What are alkali metals?
A bond formed by the transfer of electrons.
What is an ionic bond?
Rusting iron is an example of this type of change
What is a chemical change?
A measurement of 25.0 mL contains this many significant figures.
What are 3 significant figures?
Atoms of the same element with different numbers of neutrons.
What are isotopes?
As you move from left to right across a period, atomic radius generally does this.
What is Decreases?
The number of electrons in the outermost energy level of an atom.
What are valence electrons?
A substance made of two or more elements chemically combined
What is a compound?
Convert 2.5 kilograms into grams.
What is 2500 grams?
An atom with 17 protons and 18 electrons has this charge.
What is a 1− charge?
The most reactive nonmetal family
What are the halogens?
The compound formed when sodium transfers an electron to chlorine.
What is NaCl (sodium chloride)?
During a chemical reaction, the total mass of reactants equal the total mass of products because of this law.
What is the law of conservation of mass?
A sample has a mass of 40 g and a volume of 20 cm³. Calculate its density.
What is 2 g/cm³?
An atom contains 26 protons and 30 neutrons. Determine its mass number.
What is 56?
This periodic trend measures an atom’s attraction for electrons in a bond.
What is electronegativity?
Explain why MgCl₂ forms instead of MgCl.
What is magnesium loses 2 valence electrons, requiring two chlorine atoms to gain one electron each?