CHAPTER 11 HW (PHYSICS)
What is the molecular mass of a water molecule?
18 amu
How many protons should be added to the nuclei of oxygen atoms so the resulting gas will glow red when there is an electric current through it?
2
How many individual atoms are in a water molecule?
3
What is the number of orbiting electrons in each when the isotopes are electrically neutral?
Cobalt-59: 27 electrons Cobalt-60: 27 electrons
What is the number of neutrons in each?
Cobalt-59: 27 electrons Cobalt-60: 33 neutrons
The chemical properties of matter come mostly from its
Electrons
To become a negative ion, does an atom lose or gain an electron?
Gains
The number of atoms in a common water molecule is
Three
Compared to the mass of a hydrogen atom, the mass of an oxygen atom is
16 times as great
What makes an element distinct?
The number of protons
Compared to the atoms that make up the body of an elderly person, the atoms that make up the body of a newborn baby are
The same age
There are about as many atoms of air in our lungs at any moment as there are breaths of air in the atmosphere of
The whole world
Atoms heavier than helium were made by
Thermonuclear fusion
How many different elements are in a water molecule?
Two
Which of these atoms has the greatest amount of electrical charge in its nucleus?
Uranium
Which of these atoms has the greatest number of electrons?
Uranium
Which of these atoms has the most mass?
Uranium
Which of the following is not an element: Hydrogen, carbon, oxygen or water?
Water
An atomic mass unit is 1/12 the mass of:
A carbon atom
The smallest particle of those listed below is
A quark
As the text cites, atoms are incredibly tiny, numerous, perpetually moving and what else?
Ageless
Nuclei of atoms that make up a newborn baby were made in
Ancient stars
If two protons and two neutrons are removed from the nucleus of an oxygen atom, what nucleus remains?
Carbon
If two protons are removed from an oxygen nucleus, the result is
Carbon
The atomic masses of two isotopes of cobalt are 59 and 60; What is the number of protons in each?
Cobalt-59: 27 protons Cobalt-60: 27 protons
A force that determines the chemical properties of an atom is an
Electrical force
The volume of matter comes mostly from its
Electrons
Which of the following are negatively charged?
Electrons
When carbon and oxygen atoms combine energy is
Given off by the reaction
Which of these atoms has the largest number of neutrons in the nucleus?
Gold
An important feature of atoms is that they:
Have wave properties
If one neutron is added to a helium nucleus, the rest is
Helium
Which of the following is an element?
Hydrogen
What element results if you add a pair of protons to the nucleus of mercury?
Lead
Which has the greatest number of protons in its nucleus?
Lead
To become a positive ion, does an atom lose or gain an electron?
Loses
Which of these statements is true?
Molecules are the smallest subdivision of matter that still retains chemical properties of a substance.
The reason a granite block is mostly empty space is that the atoms in the granite are
Mostly empty space themselves
The charge in the nucleus of an antimatter hydrogen atom is
Negative
If two protons are added to an oxygen nucleus, the result is
Neon
Which of the following are electrically neutral?
Neutron
How many atoms are in a molecule of ethanol?
Nine
If no molecules in a body could escape, would the body have any oder?
No
Solid matter is mostly empty space. The reason solids dont fail through one another is because
Of electrical forces
In an electrically neutral atom, the number of protons in the nucleus is balanced by an equal number of
Orbital electrons
Dark matter is considered to be
Plentiful in the universe
The weight of matter comes mostly from its
Protons and neutrons
Rank the number of shells in these noble-gas atoms from most to least:
Radon, Argon, Neon, Helium
Consult the periodic table and rank these atoms, from most to least, by THEIR MASS:
Selenium, Sulfur, Silicon, Carbon
Consult the periodic table and rank these atoms, from most to least, by their number of PROTONS:
Selenium, Sulfur, Silicon, Carbon
Consult the periodic table and rank these atoms, from most to least, by their numbers of ELECTRONS:
Selenium, Sulfur, Silicon, Carbon
In our part of the universe, antimatter is
Short lived
Assuming all the atoms exhaled by Julius Caesar in his last dying breath are still i the atmosphere, then we probably breathe one of those atoms with each:
Single breath
What did Robert Brown see under the microscope?
Specks of the dust moving around
If we doubled the magnifying power of the most powerful optical microscope in the world, we would
Still not be able to see or photograph an atom
If you place a Styrofoam up on the table and a bunch of BBs move around it randomly, what will happen to the up, and why?
The cup will move randomly in different directions because the BBs will exert unequal forces on the cup in different directions
Why did the particles jiggle around?
The particles were struck by atoms, but unequally on different sides
Brownian motion has to do with the
random motions of atoms and molecules
