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Atoms, Molecules, and Ions Chapter 2: Dalton's Atomic Theory

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Atoms, Molecules, and Ions Chapter 2: Dalton's Atomic Theory

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Questions and Answers

According to Dalton's Atomic Theory, which statement is true about atoms of the same element?

They are identical (correct)

They have different chemical properties

They differ in mass

They vary in size

What is the key concept in the Law of Multiple Proportions?

Elements can form multiple compounds with different ratios (correct)

Ratios of atoms in compounds are always whole numbers

Atoms can be divided into smaller particles

Elements combine in fixed ratios to form compounds

In Rutherford's Experiment, what did the discovery of the nucleus reveal about atoms?

Atoms have negative charge concentrated in the nucleus

Atoms are indivisible and cannot be broken down

Atoms consist mostly of empty space with a dense nucleus (correct)

Protons carry the positive charge of the atom

Which scientist measured the mass and charge of an electron using a Cathode Ray Tube?

J.J. Thomson Signup and view all the answers

What did Millikan's Experiment determine about the charge of an electron?

It is a negative charge Signup and view all the answers

What did Thomson's Model of the atom propose regarding the distribution of positive charge?

Positive charge scattered throughout the atom Signup and view all the answers

What is the formula for silicon tetrachloride?

SiCl4 Signup and view all the answers

Which of the following is the formula for tetraphosphorus decoxide?

P4O10 Signup and view all the answers

What is the formula for carbon disulfide?

CS2 Signup and view all the answers

Which of the following is an oxoacid?

H2CO3 Signup and view all the answers

What is the name of the anion formed when all hydrogen ions are removed from nitric acid (HNO3)?

Nitrate Signup and view all the answers

What is the name of the anion formed when all hydrogen ions are removed from phosphorous acid (H3PO3)?

Phosphite Signup and view all the answers

In Chadwick's experiment, why was it important to measure the mass of helium and hydrogen atoms?

To investigate the neutron content in atomic nuclei Signup and view all the answers

What is the relationship between the atomic number and the mass number of an isotope?

Atomic number is equal to the number of protons Signup and view all the answers

Based on Rutherford's model, if an atom has an atomic radius of 150 pm, what would be its nuclear radius?

$6 \times 10^{-15}$ m Signup and view all the answers

What statement best describes isotopes?

Isotopes are elements with different mass numbers but the same atomic number Signup and view all the answers

What characteristic makes neutrons unique compared to protons and electrons?

Neutrons have zero charge Signup and view all the answers

If an element has 20 protons and 22 neutrons, what is its mass number?

42 Signup and view all the answers