Scientific Method
Reaction Rates
Periodic Table
Chemical Formulas
Chemical Reactions
100
Volumes of ten different solutions can best be summarized by what type of graph?
What is a bar graph
100
What would help the result of a slow rate of dissolving?
What is temperature
100
Holly determined that each atom has 24 protons , 24 electrons, and 30 neutrons. What is the mass number for this chromium isotope?
What is 54
100
Some cities use magnesium chloride (MgCl2), to keep roads from getting icy in the winter. Magnesium chloride forms ions in an aqueous solution. What ions does magnesium chloride form?
What is Mg+ and Cl -2
100
What type of reaction is this C + O2 = CO2
What is Synthesis Reation
200
A student collects soil samples from different areas in Louisiana and brings them to school. Using these samples, which question could the students answer by means of a scientific investigation?
What is the amount of water retention.
200
Raphael is studying the movement of water molecules as ice changes from a solid to liquid water. What best describes the change in the movement of the water molecules as heat causes the ice to melt.
What is Vibration to sliding past each other
200
Which element has no valence electron A) He B) Be C) Na D) Mg
What is A
200
What is the name for SiO2
What is silicon dioxide
200
What type of reaction is Zn + H2SO4 = ZnSO4 + H2
What is Single Displacement
300
Some students observed that the mass of an ice cube in a freezer decreased by half over thirty days. A testable hypothesis about the situation would be?
What is amount of mass lost do to length of time left in freezer.
300
A liquid getting colder would result in to what type of reaction?
What is endothermic reaction
300
How many valence electrons does an element in group 15 of the periodic table have?
What is 5
300
Leo is comparing carbon-12 and carbon 14. What is the difference with the subatomic particles in the carbon atoms?
What is carbon 14 has 2 more neutrons
400
A student designed an experiment to determine how the concentration of an enzyme affected the rate of a reaction. She measured the rate of the reaction in test tubes with five different enzymes concentrations. To improve the experiment, the student should have?
What is controlled experiment
400
Garret know that sodium (Na) and chlorine (Cl) react together violently. What is one reason the reaction readily occur?
What is Na is a reactive metal in group 1 Cl is a reactive non- metal in group 17
400
An elevator does 9,000 newton-meters of work in 6.0 seconds
What is 1500 watts
400
Lei uses a pencil sharpener to sharpen a pencil before class. After she is done, the pencil is warm because of the transformation of
What is Chemical energy to Mechanical energy
500
A student bicycled 12 kilometer east in 45 minutes. What is the studnets average velocity during this time in kilometers per house
What is 9 km/h east
500
Two forces acting on a rock is 15N right and 7 N left with a mass og 3 kg. based on Newton's second law what is the acceleration of the rock
What is 5 m's2 to the right
500
A force of 10 newtons is used to push a 5 kilogram object a distance of 18 meters. what is the acceleration og the rock
What is 180 joules
500
Which type of electromagnetic wave can pass through the human body due to the high-energy nature of the wave?
What is Gamma Rays
500
During a strength and fitness contest, each participant must move 120 fifty-kilogram weights from the floor to the shelf 1 meter above the floor. The participant with the fastest time wins the contest. If all the participants finish the task, what can be concluded about the participants power compared to the amount of work.
What is the winner did used more power and did the same amount fo work
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