Ch 3 Chemistry

The gold foil experiment discovered what?

The average atomic mass of an element is

Except for in the simplest type of hydrogen atom, all nuclei consist of

Experiments with cathode rays being deflected by a magnetic field show that cathode rays are composed of particles that

The isotope uranium-235 has 92 protons and 143 neutrons. Therefore, its mass number is

Electrons can be found

Cathode rays are composed of particles that are now known as

Which is one way that Dalton’s atomic theory has been shown to be incorrect?

Mass number is

Neutral atoms contain equal numbers of

Which statement best explains why protons can remain close to one another in a nucleus?

According to the law of conservation of mass, when Na, H, and O react to form a cmpd, the mass of the cmpd will be

The total volume of the nucleus of an atom is

What is the mass of 3.56 mol of glucose, C₆H₁₂O₆? (The molar mass of C₆H₁₂O₆ is 180.18 g/mol.)

An atom of potassium has 19 protons and 20 neutrons. Its mass number is

chemists observed that mass is neither created nor destroyed in a chemical reaction. This scientific law is called

What is the definition of one atomic mass unit?

fact that every sample of a particular chemical cmpd contains the same elements in exactly the same proportions by mass

According to the law of definite proportions, any two samples of KCl will have

Isotopes are atoms of the same element that have different

The word atom means

To calculate the number of atoms present in 2.0 mol of an element, you would

The molecular mass of CO₂ is 44.01 amu. What is the mass of 2.0 mol of CO₂?

Most of an atom is

Compared with a mole of lead atoms, a mole of iron atoms

The atomic number of an element is

Rutherford called the region that deflected alpha particles

The molar mass of an element is numerically equal to the element’s

What is the charge of a neutron?

The least massive particle in an atom is the

Which of the following is not equal to 1.00 mol of carbon-12?

The ancient Greek natural philosopher that first proposed the notion of the atom was

Which of the following is not one of the five principles of Dalton’s theory?

The molar mass of an element is numerically equal to

How many moles of sodium hydroxide, NaOH, are in a 35.65 g sample of NaOH? (The molar mass of NaOH is 40.01 g/mol.)

Thomson’s experiment showed that the charge-to-mass ratio of electrons was

Rutherford’s gold-foil experiment led him to conclude that

To determine the mass in grams of an atom of any element, you would

The units of molar mass are

Which feature of Dalton’s atomic theory is different from modern atomic theory?