Tutoring Topic 2: Life's Chemistry

Which statement best defines matter?

• Anything that has weight but no volume

• Anything that occupies space and has mass

• Anything composed of molecules only

• Anything that contains atoms

Which of the following correctly matches the term with its definition?

• Mass – pull of gravity on an object

• Weight – amount of matter in an object

• Mass – amount of matter in an object

• Weight – measured in atomic mass units

Which statement about molecular mass and molar mass is TRUE?

• They have different numerical values

• Molecular mass is measured in g/mol

• Molar mass is measured in amu

• They have the same numerical value but different units

Tags

NGSS.HS-PS1-7

Which particles have an electrical charge? (select multiple)

• Protons

• Neutrons

• Electrons

• Isotopes

(a)   bonds are weak, but strong in large numbers.

Valence electrons are located....

• in the innermost shell

• in the nucleus

• in the outermost shell

• outside the orbital

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the Molar Mass of CO2 ?

(a)  

Label the partial positive and partial negative regions on the water molecule.

Which statements about acids, bases, and buffers are correct?

• Acids release H⁺ ions

• Bases accept protons

• Buffers resist changes in pH

• Normal blood pH is 7.4

Cohesion is water sticking to itself

• True

• False