Which of the following about the elements is true?
All of them are highly reactive metals.
All of them are highly reactive nonmetals.
F and Cl are reactive nonmetals and Br and I are highly reactive metals.
F and Cl are reactive metals and Br and I are highly reactive nonmetals.
What do atoms consist of?
Elements
Compounds
Charged and uncharged particles
Neutrons moving around a nucleus
What is a liquid homogeneous mixture called in which the solute is dissolved and distributed evenly within the solvent?
Colloid
Compound
Emulsion
Solution
What is formed when atoms of elements combine?
Compounds
Electrons
Protons
Neutrons
Which of the following is a compound?
Ne
N2
NaCl
O2
Which of the following processes releases heat?
Evaporation
Freezing
Melting
Sublimation
Which family in the periodic table has elements that are all radioactive?
Which of the following increases the concentration of OH- ions?
Acid
Base
Water
Salt
There are 118 elements in the periodic table. What is a likely estimate of the number of compounds formed by these elements?
118 compounds as each compound is made of one element
236 compounds as each compound is made of two elements
Far greater than 118 because elements combine in various ways
59 compounds because elements pair up with each other to form all compounds
Which of the following steps will speed up the reaction between coal and oxygen?
Keep the coal in a wide dish
Decrease the temperature of oxygen
Increase the temperature of coal
Keep the coal in a narrow test tube
Which of the following elements has properties different than the rest?
K
Na
Mg
S
Which statement is correct according to Dalton's atomic theory?
Matter can destroy atoms.
Matter is made up of atoms.
Atoms are composed of matter.
Atoms can be divided into molecules.
