element's names, and periodic table
What is the name for the following element symbols:
N, Pb, Cl, Zn, Ca, K
Nitrogen, Lead, Chlorine, Zinc, Calcium, Potassium
Classify each of the following changes as physical or chemical.
a) Burning a match
b)Slicing a ham
c) A container of unrefrigerated milk goes sour.
a) chemical
b)physical
c) chemical
What is the correct sig figs for the following numbers? and what is the type of measurement of each unit?
a) 0.00561 Kg
b)309 m
a) 3sf, its measurement is "weight"
b) 3sf, its measurement is "distance"
For S8,
a)Is it an atom or a molecule?
b)Is it an element or compound?
a) molecule
b)Element
Calculate the numbers and take the correct sig figs.
12.456-10.32
2.14
What is the symbol for the following elements:
Mercury, Strontium, Silicon, Arsenic
Hg, Sr, Si, As
Which of the following is a correct statement about mixtures?
a)The composition of a homogeneous mixture cannot vary.
b)A heterogeneous mixture must contain at least three substances.
c)All heterogeneous mixtures have a nonuniform appearance.
C
Convert from Scientific Notation to decimal for the following numbers.
a)3.56x10^7
b)1.02x10^-2
a)35600000
b)0.0102
For CaSO4
a) Atom or molecule?
b)Element or compound?
a) molecule
b) compound
Calculate the numbers and take the correct sig figs.
(456.7)x(45.1)/(8.64)
2380
Write a name of an element in the alkali metal group.
Lithium (Li), Sodium (Na), Potassium (P), etc.
A mixture of water, ice, and motor oil is a heterogenous mixture that contains.
a) one phase
b) two phases
c) three phases
C
Convert from regular numbers to scientific notation for the following numbers.
a)0.00879
b)1.89
a)8.79x10^-3
b)1.89x10^0
For Ca(C2H3O2)2
a)Atom or molecule?
b) element or compound?
a)molecule
b)compound
What is the density of sulfur when having a mass of 100.g and a volume of 48.3cm^3?
2.07g/cm^3
Write a chemical symbol for a semimetal (metalloid).
Si, B, Ge, As, Sb, Te, etc.
Which of the following statements about various substances describes a physical property of the substance?
a)Copper metal can be drawn into thin wires.
b) Gold metal does not tarnish in air.
c) Hydrogen peroxide decomposes in the presence of light
a
How many hhs are there if you have 12mmp?
Conversions=
19jams=37mmp
25hhs=70jam
2.2hhs
For S8
a) How many atoms?
b)How many elements?
a) 8 atoms
b)1 element
What is the mass of iron if a sample fills a 200cm^3 box?
its dencity is 7.87g/cm^3
2000g
What is the blok that Ni is in?
D block
Which of the following statements about various substances describes a chemical property of the substance?
a)Silver metal will not dissolve in hydrochloric acid.
b)Beryllium metal has a silvery gray color.
c)Water ice metls at 32F
a
Convert 35.0m to inches.
1380inc
For Ca(C2H3O2)2
a)How many atoms?
b)How many elements?
a) 15 atoms
b) 4 elements
A sample has mass 36dg and density 1.8g/mL. What is the volume in mL?
2.2mL