April 8 Chemistry Part 1

Which particles surround the nucleus of a neon atom?

• electrons
• neutrons
• positrons
• protons

Which statement describes a chemical property?

• Copper has a red-orange color
• copper can be flattened into sheets
• Copper reacts with oxygen
• Copper conducts electricity

Heat flows from an object at a temperature of 20 degrees to an object at a temperature of

• 15
• 25
• 35
• 45

Which phase represents an increase in entropy? Hey three answers lose energy and only 1 gains energy. Entropy is randomness.

• liquid to gas
• liquid to solid
• gas to solid
• gas to liquid

Which phrase describes a specific compound?

• can can contain only 1 element
• can be physicall seperated into elements
• is composed of elements chemically combined in a definite ratio
• is composed of elements mixed in proportions that can vary

Nuclear energy leaves a lot of dangerous radiation waste. Which statement describes a BENEFITs of the nuclear reaction that occurs in a nuclear power plant?

• Large amounts of water are needed to cool the nuclear reactor
• The power plant reaction can be used in dating geologic formation
• Radioactive isotopes stored for a very long time at the power plant site
• A large amount of energy is produced from a small amount of radioisotope

The difference in which property allows the separation of water and sand by using filter paper and a funnel?

• boiling point
• melting point
• particle size
• sample volume

During a phase change, there are two states of matter. A change takes place until there is only one state of matter. What variable stays the same and does not change until the phase change is complete and only 1 state of matter exists?

• Time
• Thermal Energy
• Temperature
• substance condition

Which statement describes two different isotopes of carbon?

• The isotope contains the same number of neutrons and has the same atomic number
• The isotope cotains the same number of neutrons but has a different atomic number
• The isotope contains a different number of neutrons but have the same atomic number
• The isotope contains a different number of neutrons and have a different atomic number.

Moving on the periodic table from Atomic number 11 to Atomic number 17, the classification of elements changes from Only 1 answer goes in the right order.

• metal to metalloid to nonmetal
• metal to nonmetal to metalloid
• nonmetal tometalloid tometal
• nonmetal to metal to metalloid