Conservation of Mass +
Below is the pH values of some different foods.
Eggwhites, pH 7.96. Graham crackers, pH 7.92
Berry juice, pH 2.30 . Conch snails, pH 8.40
Based on its pH level, which kind of food is most likely to have a sour taste?
A. Berry juice B. Graham crackers
C. egg whites D. Conch snails
What is A. Berry juice?
An asteroid belt orbits the sun between the orbital paths of Mars and Jupiter. What force holds the asteroids in orbit?
What is a result of all chemical reactions?
In which of these examples do the water molecules have the slowest motion?
A ice cubes resting in a freezer
B water dripping from a faucet
C water vapor collecting on a window
What is C water vapor collecting on a window
Which of these allows scientists to estimate the relative age of fossils found in exposed sedimentary rock?
A. size of fossils B. depth of fossils
C. color of fossils
A strip of litmus paper turns blue when placed in a liquid. This observation indicates that the liquid has the properties of
A. pure water.
B. a base.
C an acid.
What is B. a base?
Which of these would most significantly decrease the biodiversity in a wetland area?
A removing invasive species from the wetland
B planting native trees in the wetland
C draining the wetland to build houses
What is C draining the wetland to build houses?
A company wants to produce a synthetic fire log that will burn longer than their competitors’ fire logs. What should designers do to ensure that their new fire log burns longer than fire logs of their competitors?
A. modify the components of the new fire log until the desired results are produced
B. burn the fire logs of competitors until the desired results are produced
C. modify the collected data to reflect the desired results
What is A. modify the components of the new fire log until the desired results are produced ?
The best indicator that a combination of substances forms a compound is when the combination
A increases in volume.
B causes a color change.
C forms a new material with different properties.
What is C forms a new material with different properties?
A student investigating metal densities had samples of four different types of metals. The student measured the volume and mass of each sample. What was the independent variable in this investigation?
A. type of metal
B. density of metal
C. volume of sample
What is A. type of metal?
A design team has constructed a prototype of a device that filters water to make it suitable for drinking. Which tools are best for testing the rate at which water flows out of the filtering device?
A. funnel and meter stick
B. beaker and microscope
C. graduated cylinder and stopwatch
What is C. graduated cylinder and stopwatch?
In the reaction shown by the equation, 252 grams of FeCl2 and 70 grams of Cl2 are consumed.
2FeCl2 + Cl2 --> 2FeCl3
How many grams of FeCl3 are produced?
A. 161 grams B. 182 grams C. 322 grams
What is C. 322 grams?
The orbit of the moon around Earth is possible because of which property?
A. the speed of revolution of Earth around the sun
B. the strength of the force of gravity on Earth
C. the strength of the magnetic field on Earth
What is B. the strength of the force of gravity on Earth?
The chemical formula for a substance is shown.
KCl
This substance can best be described as
A. an atom of potassium chloride.
B. the compound potassium chloride.
C. the element potassium chloride.
What is B. the compound potassium chloride?
2Fe + 6NaBr --> 2FeBr3 + 6Na
Which is a reactant in one of the equations?
A. FeBr3
B. Na
C. NaBr
What is C. NaBr?
Which action is the best example of a chemical change?
A creating new substances by burning small twigs to set a log on fire
B creating new substances by hammering an iron nail into a piece of wood
C creating new substances by cutting a copper wire into small pieces
What is A. creating new substances by burning small twigs to set a log on fire ?
A chemical equation is shown below.
4Fe + 3O2 -->2Fe2O3
The mass of 2Fe2O3 produced must be equal to
A. the total mass of 4Fe and 3O2.
B. twice the total mass of 4Fe and 3O2.
What is A. the total mass of 4Fe and 3O2
A student wants to make a magnet by wrapping a wire around a piece of iron. Which of these does the student need to do to make the iron magnetic?
A rotate the piece of iron inside the wire
B rub the wire with a silk cloth
C heat the wire on the piece of iron
D pass electricity through the wire
What is D pass electricity through the wire?
Which is a compound?
A. lead (Pb)
B. sulfur (S)
C. hydrogen peroxide (H2O2)
What is C. hydrogen peroxide (H2O2)?
Which represents the smallest part of an element that retains all the properties of that element?
A. molecule
B. atom
C. nucleus
What is B. atom ?
Which of these is the most likely intended benefit of laser eye surgery?
A. preventing eye injuries
B. protecting against eye diseases
C. improving a person’s vision
What is C. improving a person’s vision?