11th Grade Chemistry Chapter 4 Test

Which of the following was one of Dalton's improvements over Democritus's ideas?

• Matter consists of tiny particles called atoms.

• Atoms are indivisible.

• Atoms retain their identity in a chemical reaction.

• Atoms are indestructible.

The smallest particle of an element that retains the properties of that element is a(n)

• atom

• electron

• proton

• neutron

Dalton's atomic theory included which idea?

• All atoms of all elements are the same size.

• Atoms of different elements always combine in one-to-one ratios.

• Atoms of the same element are always identical.

• Individual atoms can be seen with a microscope.

Which discovery did J.J. Thompson make that improved upon Dalton's atomic theory?

• Atoms contain tiny, negatively charged electrons.

• Atoms are always in motion.

• Atoms contain a tiny, positively charged nucleus.

• Atoms that combine do so in simple whole-number ratios.

Which of the following was originally a tenet of Dalton's atomic theory, but had to be revised about a century ago?

• Atoms are tiny indivisible particles.

• The atoms of any one element are different from those of any other element.

• Compounds are made by combining atoms.

• Atoms of different elements can combine with one another in simple whole number ratios.

Tags

NGSS.HS-PS1-7

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on Earth is used to illustrate which of the following?

• that atoms are indivisible

• that atoms are very small

• that atoms are very large

• that in a copper penny, there is one atom for every person on Earth

The range in size of most atomic radii is approximately

• 2 to 5 cm.

• 2 to 5 nm.

• $5\ x\ 10^{-11}\ m.\$ to $2\ x\ 10^{-10\ }m.$

• $5\ x\ 10^{-21}\ m.\$ to $2\ x\ 10^{-20}\ m.$

Evidence about Dalton's atomic theory has shown that

• all of Dalton's hypotheses were correct.

• atoms of an element can have different numbers of protons.

• atoms are divisible.

• all atoms of an element are not identical but they must all have the same mass.

Tags

NGSS.HS-PS1-7

Why did J. J. Thomson reason that electrons must be a part of the atoms of all elements?

• Cathode rays are negatively-charged particles.

• Cathode rays can be deflected by magnets.

• An electron is 2000 times lighter than a hydrogen atom.

• Charge-to-mass ratio of electrons was the same, regardless of the gas used.

Which of the following is true about subatomic particles?

• Electrons are negatively charged and are the heaviest subatomic particle.

• Protons are positively charged and the lightest subatomic particle.

• Neutrons have no charge and are the lightest subatomic particle.

• The mass of a neutron nearly equals the mass of a proton.