Which of the following changes can alter the form of a substance but does not necessarily change it to the other substance?

a. physical changes

b. pressure changes

c. phase changes

d. all of the above

A0C3H7OH + a1O2 → a2CO2 + a3H2O

Scientists classify rocks into three different types. What is the main basis for the classification system they chose? color of the rock shape of the rock how the rock formed who discovered the rock

Determine whether the molecule ch3sh is polar.

According to the modern model of the atom, the nucleus of an atom is surrounded by one or more

An atom has atomic number 11 and mass number 23. How many electrons does the atom have?

Which type of bond forms between water molecules? a. strong bond b. hydrogen bond c. covalent bond d. polar bond

Down syndrome is caused by the presence of an extra copy of chromosome 21. how would a karyotype identify a person with down syndrome? a) ID physical characteristics of someone with the disease.

Which expression is a measurement of denisty

Compare the information provided by a molecules chemical formula to the information provided by its structural formula

How is a circle different from an ellipse