CH11 PSY HW

What is a compound? Cite two examples. 1`The same types of atoms bonded together: H2 and N2 2`Atoms pressed together without bonding: air and salt and sand 3`Atoms of different elements with bonds between them: NaCl and H2O 4`Atoms of different elements with bonds between them: NaCl and H2

3`Atoms of different elements with bonds between them: NaCl and H2O

Dark matter is considered to be __________. 1`a local phenomenon 2`at the center of all atomic nuclei 3`plentiful in the universe 4`a form of dark energy

3`plentiful in the universe

As the text cites, atoms are incredibly tiny, numerous, perpetually moving, and what else? 1`Mainly in the air 2`New in science 3`Migratory 4`Ageless

4`Ageless

The periodic table of the elements is a list of __________. 1`Molecules 2`Ions 3`Isotopes 4`Atoms

4`Atoms

Which investigator is credited for discovering Brownian motion? 1`John Dalton 2`Albert Einstein 3`Robert Motion 4`Robert Brown

4`Robert Brown

What is at the center of every atom? 1`The nucleus as electrons. 2`A cloud of nucleons surrounding the nucleus. 3`The electron cloud. 4`The nucleus as protons and neutrons.

4`The nucleus as protons and neutrons.

Consider the following elements: Calcium, Strontium, Lithium, Oxygen. Consult the periodic table and rank them from most to least, by their mass.

Strontium Calcium Oxygen Lithium

Consider the following elements: Calcium, Strontium, Lithium, Oxygen. Consult the periodic table and rank these atoms, from most to least, by their number of electrons.

Strontium Calcium Oxygen Lithium

Consider the following elements: Calcium, Strontium, Lithium, Oxygen. Consult the periodic table and rank these atoms, from most to least, by their number of protons.

Strontium Calcium Oxygen Lithium

How does a molecule differ from an atom? Give an example. 1`A molecule is composed of two or more atoms bonded together: H2O. 2`A molecule is made when two or more nuclei fuse together. 3`A molecule is a mixture of atoms: NaCl. 4`A molecule is made only when two or more of the same elements bond together: H2.

1`A molecule is composed of two or more atoms bonded together: H2O.

An important feature of atoms is that they __________. 1`have wave properties 2`can barely be seen with the naked eye 3`make up electric beams 4`are actually tiny solar systems

1`have wave properties

The charge in the nucleus of an antimatter hydrogen atoms is __________. 1`negative 2`positive 3`neutral, no charge 4`exotically different than positives and negatives

1`negative

Which of the following is an element? 1`A supernova 2`Hydrogen 3`Carbon dioxide 4`H2O

2`Hydrogen

What is a mixture? Cite two examples. 1`Atoms pressed together without bonding: air and salt and sand 2`Atoms of different elements with bonds between them: NaCl and H2O 3`The same types of atoms bonded together: H2 and N2 4`Atoms pressed together without bonding: H2O and H2

1`Atoms pressed together without bonding: air and salt and sand

What did Robert Brown see under the microscope? 1`specks of dust moving around 2`atoms moving around 3`atoms mixed with specks of dust moving around

1`specks of dust moving around

What is the evidence that dark matter exists? 1`Gravitational forces within galaxies are too great to be accounted for with ordinary matter. 2`Dark matter blocks distant light and can be seen as dark clouds in space. 3`When dark matter falls into a black hole, it emits light. 4`When dark matter clouds collide, they emit light.

1`Gravitational forces within galaxies are too great to be accounted for with ordinary matter.

Distinguish between mass number and atomic mass. 1`Mass number is the number of nucleons; atomic mass is the total mass of an atom. 2`Mass number is the number of protons; atomic mass is the total mass of an atom. 3`Mass number is the number of neutrons; atomic mass is the total mass of an atom. 4`Mass number is the number of electrons; atomic mass is the total mass of an atom.

1`Mass number is the number of nucleons; atomic mass is the total mass of an atom.

If you place a Styrofoam cup on the table and a bunch of BBs move around it randomly, what will happen to the cup, and why? 1`The cup will move randomly in different directions because the BBs will exert unequal forces on the cup in different directions. 2`The cup will move steadily in one direction because of the uniform force exerted by the BBs pushing it in that direction. 3`The cup will not move, because it is much larger than the BBs.

1`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? 1`The particles were struck by atoms, but unequally on different sides. 2`The particles were struck equally on all sides by atoms that were moving around. 3`There was a constant external force that propelled the particles.

1`The particles were struck by atoms, but unequally on different sides.

Compared with the energy it takes to separate oxygen and hydrogen from water, how much energy is released when they recombine? (Think conservation of energy.) 1`The same amount of energy is released when they recombine. 2`No energy is released when they recombine. 3`Less energy is released when they recombine. 4`More energy is released when they recombine.

1`The same amount of energy is released when they recombine.

What occurs when a proton and an antiproton meet? 1`They annihilate each other. 2`They gravitationally repel each other. 3`They electrically repel each other. 4`They do not interact in any way.

1`They annihilate each other.

How many periods are in the periodic table? How many groups? 1`5 periods and 16 groups 2`7 periods and 18 groups 3`5 periods and 18 groups 4`7 periods and 16 groups

2`7 periods and 18 groups

How do matter and antimatter differ? 1`Matter gravitationally attracts matter and repels antimatter. 2`Matter emits light, whereas antimatter absorbs it. 3`Antimatter has negative weight. 4`When matter and antimatter meet, they annihilate in a flash of energy.

4`When matter and antimatter meet, they annihilate in a flash of energy.

Rank from most to least number of shells. To rank items as equivalent, overlap them. Xenon Krypton Neon Helium

Xenon Krypton Neon Helium