bruh
Which element is classified as a metalloid?
a. boron
b. potassium
c. sulfur
d. xenon
a. boron
Why is sulfur classified as a Group 16 element?
A sulfur atom has 6 valence electrons
At STP, which physical property of aluminum always remains the same from sample to sample?
density
A statement that describes a property of hydrogen gas is...
A statement that describes a property of hydrogen gas is...
What are two terms that represent two types of chemical formulas?
molecular and structural
Which lit of elements consists of a metal, metalloid, and a non-metal?
a. Li, Na, Rb
b. Cr, Mo, W
c. Sn, Si, C
d. O, S, Te
c. Sn, Si, C
Which sample of matter has the greatest distance between molecules at STP?
a. N2(g)
b. NH3(aq)
c.C6H14(l)
d. C6H12O6(s)
a. N2(g)
Which sample of CO2 has a definite shape and volume?
CO2(s)
Which element is liquid at 1000. K?
a. Ag
b. Al
c. Ca
d. Ni
b. Al
Every water molecule has two hydrogen atoms bonded to one oxygen atom. This fact supports the concept that elements in a compound are
chemically combined in proportion that vary
Which list includes elements with the most similar chemical properties?
a. Br, Ga, Hg
b. Cr, Pb, Xe
c. O, S, Se
d. N, O, F
c. O, S, Se
At STP, a 50. - gram sample of H2O (l) and a 100. - gram sample of H2O(l) have...
the same chemical properties
Which statement describes a chemical property of aluminum?
Aluminum reacts with sulfuric acid
Which elements has the highest melting point?
a. tantalum
b. rhenium
c. osmium
d. hafnium
b. rhenium
Which formula represents a mixture?
a. NaCl (aq)
b. NaCl (s)
c. H2O (l)
d. H2O (s)
a. NaCl (aq)
What quantity identifies an elements?
atomic number
The arrangement of particles is most ordered in a sample of
a. NaCl (aq)
b. NaCl (l)
c. NaCl (g)
d. NaCl (s)
d. NaCl (s)
Particles are arranged in a crystal structure in a sample of
a. H2(g)
b. Br2(l)
c. Ar(g)
d. Ag(s)
d.Ag(s)
Which substance can not be broken down by a chemical change?
a. methane
b. propanal
c. tungsten
d. water
c. tungsten
Which represents a homogenous mixture?
a.CuSO4(s)
b.Br2(l)
c. NaCl(aq)
d.CO2(g)
c. NaCl(aq)
The elements in the Periodic Table are arranged in order of increasing.....
atomic number
At-1 atm, equal masses of H2O(s), H2O(l), and H2O (g) have...
different volumes
Which substance can be decomposed by chemical means?
a. aluminum
b. octane
c. silicon
d. xenon
octane
Why is NaBr classified as a compound?
Na and Br are chemically combines in a fixed proportion.
What type of matter is composed of two or more elements that are chemically combined in a fixed proportion?
compound