PHY Ch.11
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
If a gram of antimatter meets a kilogram of matter, the amount of mass to survive is
999 grams.
The air in this room has
A) weight. B) mass. C) energy.
A form of matter that is complementary to regular matter, and consists of anti-particles. This describes ____
Antimatter
A standard unit of atmoic mass. One-twelth the mass of carbon. This describes ____
Atomic mass unit
The core of an atom, containing protons and neutrons. This describes ____
Atomic nucleus
Number of protons in an atom's nucleus. This describes ____
Atomic number
Why are the atoms in a baby's body about the same age as the atoms in an adult's body? Because...
Atoms, that are present in both baby and adult, were formed about the same time by exploding stars Atoms, that are present in both baby and adult, were formed about the same time by exploding stars
Small particles in a gas are bombarded by the gas molecules. The bombardment causes the particles to move randomly. This describes ____
Brownian motion
A process where atomic bonds are broken and other bonds are formed, changing one set of molecules into another set of molecules. This describes ____
Chemical reaction
A material containing atoms of different elements, where these atoms are chemically bonded to each other. This describes ____
Compound
About 90 percent of the matter of the universe is unseen and undetected apart from apparent gravitational influence on stars in galaxies. This describes ____
Dark matter
Negatively charged particle that is present outside the nucleus of an atom. This describes ____
Electron
Two atoms that contain the same number of protons, but different numbers of neutrons. This describes ____
Isotopes
A material containing atoms of different elements, where these atoms are NOT chemically bonded to each other. This describes ____
Mixture
The smallest particle of a compound where the particle has the chemical properties of the compound. This describes ____
Molecule
Electrically neutral particle in an atomic nucleus. This describes ____
Neutron
Positively charged particle in an atomic nucleus. This describes ____
Proton
Theory of the microworld, where both light and matter have wave and particle properties. This describes ____
Quantum mechanics
Which of the following is a mixture?
air
In a closed bottle are a certain number of hydrogen molecules. In an identical closed bottle at the same temperature and internal pressure are a certain number of nitrogen molecules. The bottle with the greater number of molecules is the one containing
both the same
If two protons are removed from an oxygen nucleus, the result is
carbon
Which of these forces determines the chemical properties of an atom?
electrical force
The atoms in your body are mostly empty space, and so are the atoms in any wall. Why then is your body unable to pass through walls ? Because of...
electrical forces
The volume of matter comes mostly from its
electrons
Most of the mass of an atom is in its
protons and neutrons
When sodium and chlorine react to form salt, a certain amount of energy is given off. This energy is ___ compared to the energy it takes to separate sodium and chlorine to form salt.
the same
Which of these atoms has the greatest amount of electrical charge in its nucleus?
uranium
Which of these atoms has the most mass?
uranium
which atom has the greatest number of electrons?
uranium