Ch. 3: MSM.

1 compound

2 elements sometimes combine to form more than?

1. All matter is composed of extremely small particles called atoms. 2. Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties. 3. Atoms cannot be subdivided, created, or destroyed. 4. Atoms of different elements combine in simple whole-number ratios to form chemical compounds. 5. In chemical reactions, atoms are combined, separated, or rearranged.

5 statements of Dalton's theory?

Truuuuuuuuu

A compound is composed of 2 or more different elements. true or false?

Neutron

A nuclear particle that has no electrical charge is called a?

Proton

A positively charged particle found in the nucleus is called a?

Indivisible

Atom was based on the Greek word meaning?

False

Atoms are made up of tiny particles called molecules. true or false?

Truuuuuuu

Atoms are the smallest particles of matter. true or false?

Truuuuuu

Atoms contain protons. true of false?

Electrons

Cathode rays are composed of particles that are now known as?

Protons: charge is +1 and mass is 1. Neutrons: charge is 0 and mass is 1. Electrons: charge is -1 and mass is 0.

Charge and mass of protons, neutrons, and electrons?

+1

Charge of a proton?

-1

Charge of an electron?

0

Charge of the neutron?

moving rapidly outside the nucleus.

Electrons can be found where?

Truuuuuuuuuu

Every atom of copper is identical to every other atom of copper. True or false?

protons and neutrons

Expect for in the simpliest type of hydrogen atom, all nuclei consist of?

Negatively charged.

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

Law of Multiple Proportions

If two or more different compounds are composed of the same 2 elements , then the ratio of the masses of the 2nd element combined with a certain mass of the first element is always a ratio of small whole numbers. What law is that?

An atom consists of a nucleus and a cloud of electrons.

In 1808, John Dalton established his atomic theory. Which of the following is NOT part of Dalton's atomic theory?

A tiny region of positive charge.

In 1911, Ernest Rutherford conducted his now famous goldfoil experiment. During the experiment, alpha particles bombarded a thin piece of gold foil. The alpha particles were expected to pass easily through the gold foil. Every now and then, however, an alpha particle bounced back ---- an unexpected result. Rutherford concluded that these particles were striking?

Neutral

Is an atom positively charged, negatively charged, or neutral?

Mass numbers

Isotopes are atoms of the same element that have different?

Cannot be broken down further.

John Dalton thought that atoms?

The total number of protons and neutrons in an atom of an element.

Mass number is?

Empty

Most of an atom is?

A nucleus

Rutherford called the region that deflected alpha particles?

Gold Foil

Rutherford used what experiment?

1. All elements are composed of tiny indivisible particles called atoms that cannot be broken down further. 2. Atoms of a given element are all similiar in their physical and chemical properties.

State 2 principles from Dalton's atomic theory that have been revised as new information has become available.

All matter is composed of atoms and atoms of any one element differ in properties from of another element remain unchanged.

The 2 important conceptsof our modern atomic theory?

The number of protons in each atom of the element.

The atomic number of an element is?

Law of Definite Proportions

The fact that a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound is known as what law?

235.

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

Truuuuuuu

The mass of an iron atom is different than a silver atom. true or false?

Atom

The smallest unit of an element that can exist either alone or in molecules containing the same or different elements is the?

Electron

The subatomic particle that is least massive is the?

Very small compared with the resst of the atom.

The total volume of the nucleus of an atom is?

Chemical Reaction

The transformation of a substance or substances into one or more new substances is known as a?

Law of Conservation of Mass

This law states that mass is niether created nor destroyed during ordinary chemical reactions or physical changes.

Neutral

What is charge of a neutron?

Thomson

What scientist used cathode-ray tubes in his quest to understand the structure of an atom?

Nucleus

Where are protons found in the atom?

Electron cloud

Where are the electrons found in the atom?

Nucleus

Where are the neutrons found in the atom?

All atoms of a particular element are identical to atoms of other elements.

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

Democritus

Who called nature's basic particle an atom?

Thomson

Who created the cathode ray tube?

Thomson

Who found the charge of an electron?

Thomson

Who found the electron?

Rutherford

Who found the nucleus?

Rutherford

Who had the gold foil experiment?

Thomson

Who had the plum pudding model?