Energy
Which is a nonrenewable resource?
oil
sunlight
water
wood
oil
Which of the following is a compound?
Sodium
Sugar
Nitrogen
Air
Sugar
C6H12O6
What two properties must be known to calculate the density of a sample of matter?
color and mass
mass and volume
length and mass
solubility and mass
mass and volume
(density = mass/volume)
Two different liquids are poured together in an open container. Bubbles begin to form. After the bubbling stops, it is determined that the total weight of the two liquids is less than before they were poured together. Which best describes this observation?
Some of the atoms during the reaction escaped into the air.
Some of the atoms during the reaction were destroyed.
Some of the atoms during the reaction became heavier.
Some of the atoms during the reaction changed to a different kind of atom.
Some of the atoms during the reaction escaped into the air.
This is a chemical reaction for the decomposition of carbonic acid into water and carbon dioxide.
H2CO3 → H2O + CO2
How does the reaction support the Law of Conservation of Mass?
Several molecules of water are produced.
The mass of carbon atoms is reduced during the reaction.
The mass of the atoms in the reactant equals the mass of the atoms in the products.
The mass of hydrogen atoms is the only thing that remains the same before and after the reaction.
The mass of the atoms in the reactant equals the mass of the atoms in the products.
Which best describes a method of obtaining energy that may cause changes in water temperature and harm to fish populations?
burning coal
using ethanol in cars
installing solar panels on a home
generating electricity in a hydroelectric power plant
burning coal
Below is information on the melting point of some of the group 1 elements.
Sodium (Na) 98o C
Potassium (K) 63o C
Rubidium (Rb) ?o C
Cesium (Cs) 29o C
Francium (Fr) 23o C
Which is the best estimate of the melting point of Rubidium (Rb)?
25o, 40o, 75o, 118o
40o C
The substance can be pounded into a thin sheet.
Which statement is true about a chemical reaction?
The physical states of the atoms in the reactants determine the products.
Some of the atoms in the reactants will be a part of the products.
The number of atoms in the reactants determines the products.
All of the atoms in the reactants will be a part of the products.
All of the atoms in the reactants will be a part of the products.
Which is most likely a major concern associated with burning fossil fuels?
Burning fossil fuels can pollute the oceans.
Burning fossil fuels can remove harmful chemicals from precipitation.
Burning fossil fuels can remove carbon dioxide from the atmosphere.
Burning fossil fuels can produce smog, which can cause respiratory illnesses.
Burning fossil fuels can produce smog, which can cause respiratory illnesses.
Which is the primary source of energy for most cells in the body?
sugar
fat
protein
vitamin
sugar
Which best describes the sequence of the elements in Period 5 of the periodic table?
highly reactive gases, relatively nonreactive metals, metalloids, very nonreactive gases, nonreactive nonmetals
highly reactive metals, relatively nonreactive metals, metalloids, reactive nonmetals, nonreactive gases
nonreactive gases, metalloids, nonreactive metals, highly reactive metals, highly reactive gases
highly reactive metals, relatively nonreactive metals, metalloids, reactive nonmetals, nonreactive gases
A sample of lead has a mass of 33 grams and a volume of 3cm3. What is the density of lead?
99 g/cm3
33 g/cm3
11 g/cm3
3 g/cm3
11 g/cm3
Which is the best example of a chemical change?
butter melting
egg cooking
paper tearing
water evaporating
egg cooking
Which action shows concern for the environment with regards to the resources of the oceans?
developing technology which will allow for an increase in fish harvesting
allowing factories to release untreated wastewater into the oceans
filling in oceanfront wetlands in order to extend beachfront properties
setting limits on fish harvesting in the oceans
setting limits on fish harvesting in the oceans
Which is classified as an element?
carbon dioxide
iron
vinegar
water
Iron (Fe)
Chlorine has 7 valence electrons. With what group of elements will chlorine most readily bond?
group 1
group 2
group 16
group 18
group 1
Which of the following is an example of a solution?
melting ice
sand and water
boiling water
alcohol in water
alcohol in water
Which of the following may happen during a physical change?
new substances are formed
reactants form products
a precipitate is formed
the temperature may increase
the temperature may increase
Which device is used to determine the volume of a liquid?
anemometer
graduated cylinder
test tube
thermometer
graduated cylinder
Which are most responsible for creating acid rain pollution?
nuclear power plants
coal-burning power plants
hydroelectric power plants
wood-burning power plants
coal-burning power plants
Which chemical equation best represents the Law of Conservation of Mass?
H + O → H2O
H2 + O2 → H2O
2H2 + O2 → 2H2O
H2 + O2 → 2H2O2
2H2 + O2 → 2H2O
What does lustrous mean?
the substance can dissolve in water
the substance has a high density
the substance is shiny
the substance is soft
the substance is shiny
Examine the following chemical reaction.
hydrochloric acid + sodium hydroxide --> sodium chloride + water
What are the reactants in the above reaction?
hydrochloric acid + sodium hydroxide
What is the first thing a student should do if an accident happens during a science experiment?
report to the teacher
clean the laboratory station
locate the nearest exit
put on safety goggles
report to the teacher