Linda Barry

Biddeford High School

Biography

I'm an avid reader and traveler, who gets stoked over chemistry and physical science.

Education

BS Mathematics
Biddeford High School

Educator Statistics

Numerade tutor for 4 years
102 Students Helped

Topics Covered

Unlocking the Power of Thermodynamics: A Comprehensive Guide

Linda's Textbook Answer Videos

1

Linda's Quick Ask Videos

0:00
Chemistry 101

Identify each of the following as a chemical property (CP) or a physical property (PP):
Diamonds are capable of cutting glass.
________________________
Isopropanol has a density of 0.78 g/ml.
________________________
Water boils at 100 degrees Celsius.
________________________
Wood is flammable.
________________________
Bromine has a red color.
________________________
Silver melts at 962°C.
________________________
Gallium is a liquid at room temperature.
________________________
Potassium reacts violently with water.
________________________
Gold is very shiny.
________________________
Sodium is so soft that you can cut it with a knife.
________________________
Magnesium burns in the absence of oxygen.
________________________
Carbon monoxide is odorless.
________________________
Iron rusts in the presence of moisture.
________________________
Vinegar has a pungent odor.
________________________
Sodium chloride is a crystalline solid.
________________________
Water does not burn.
________________________
Aluminum combines with oxygen to form a protective oxide coating.
________________________
Hydrogen gas is very flammable.
________________________
Classify each of the following as a physical change (P) or a chemical change (C):
a)____________ ignition of gasoline in your car's engine
b)____________ an iPhone shattering on impact with the ground
c)____________ a candle burning
d)____________ washing the dishes
e)____________ a scab forming over a wound
Classify each of the following as a pure substance (P), homogeneous mixture (Hom), or heterogeneous mixture (Het):
a)______________ black coffee
c)______________ nitrogen gas
b)______________ air
d)______________ orange juice with pulp

Linda Barry
01:07
Chemistry 101

The mass of one atom or molecule of a substance is given in
atomic mass units, also called Daltons (abbreviated D or Da). Thus
one molecule of water has a mass of 18.015 atomic mass units, or
18.015 Daltons. The atomic mass unit is defined such that one mole
of water weighs 18.015 g. Suppose a protein has a mass of 64 192
Daltons (or 64.192 kDa). What would be the mass of one mole of this
protein?

Linda Barry
01:13
Chemistry 101

How many MOLECULES of boron tribromide are present in 7.65 grams of this compound?
How many GRAMS of boron tribromide are present in 5.63×10^22 molecules of this compound?

Linda Barry
01:19
Chemistry 101

A compound contains 75.9% carbon, 17.7% nitrogen, and 6.4%
hydrogen. Calculate the molecular formula of the compound if the
molar mass of the compound is 79.10 g/mol.

Linda Barry
01:55
Biology

Define somatic gene therapy and compare to germ line gene
therapy. List two major ethical concerns scientists have regarding
germ line gene therapy that they do not have regarding somatic gene
therapy.

Linda Barry
01:18
Chemistry 101

Ernest Rutherford discovered the nucleus in atoms. What experimental evidence did he have?
Alpha particles were bombarded at the atoms of a thin gold foil.
Most of the alpha particles passed directly through the foil because gold atoms were mainly made of empty space.
A small number of alpha particles bounced back because they hit the center of the atom, which was made up of a core of negatively charged particles.
He proposed the nuclear model of the atom, which suggested that the atom has a small central core of protons surrounded by electrons orbiting around it.

Linda Barry
1 2 3 4 5 ... 17