When a 10% HCl acid solution is heated in an open test tube, which way should the test tube be pointed?
What is away from you and nearby people
100
In animal cells, which structure is used to store water?
What is the vacuole
100
What term is used to describe the eating habits of humans?
What is omnivore
100
A solution with more OH- ions will be considered a___________ solution.
What is a basic
100
A man sits in a wheelchair, at rest, and throws a basketball forward. If the man and the wheelchair have a greater mass than the ball, what will be the man and the wheelchair's speed compared to the basketball?
What is they will move slower than the ball
200
The purpose of safety items (lab apron, goggles and insulated mitts or beaker tongs) is primarily to protect against:
What are hot materials and spills of harmful liquids
200
A student touches a sharp pin and then quickly moves her hand away, What two body systems are involved in the student's reaction?
What are the Nervous and Muscular system
200
I am a boat
I am boat
The second is an example of what type of mutation?
What is deletion
200
Water molecules generally do what to a soluble ionic compound mixed into water?
What is breaking the bonds between the ions
200
What type of circuit will allow a lightbulb to still be lit, if one of the paths fails?
What is a parallel circuit
300
You are looking to measure the density of an odd shaped rock that has a mass of 20 mg. The volume of the water before the rock is measured is 10ml; after the rock is placed into the water, the final volume is 35ml. What is the denisty in g/mL?
What is 0.0008 g/mL
300
A vine grows on a tree in a rain forrest. What are these climbing plants most likely adapted for?
What is growing through layers of foliage to reach available sunlight.
300
How does using killed or weakened bacteria in an immunization help our immune system prevent infections?
What is by forming antibodies that will fight those types of bacterias and viruses
300
In a single-displacement reaction, you have the chemical change: 2HI + F2 --> 2HF +I2
masses: w x y z
What equation would agree with the law of conservation of mass?
What is
w+x = y+z
300
A 0.20kg ball moves with a velocity of 12.0 m/s to the right. What is the momentum of the ball (kgm/s)?
What is 2.40 kgm/s
400
What instruments are used to measure structures inside a leaf, in space, and on the ground? Answer in order
What are: microscope, telescope, and a hand lens
400
An open circulatory system has tissues that are bathed in circulatory fluid and not entirely contained in vessels.
A closed circulatory system has blood flowing through a system of vessels that are a closed loop. Which of the following has an open circulatory system: Fish, earthworm, amphibian or a grasshopper?
What is a grasshopper
400
What are the three methods of seed dispersal?
What are: animals, water, and by air
400
What property of water allows molecules of water to be attracted to each other?
What is polarity
400
An object weighs 40kg. It's velocity increases from 20 m/s to 30 m/s in a time of 2 seconds. What is the acceleration during a 2 second interval during that time?
What is 5 m/s^2
500
Some students are testing water samples that come from different ponds. You need to measure exactly 20ml of water, what instrument should you use to be the most accurate and precise?
What is a graduated cylinder
500
You cross a heterozygous plant having purple flowers (Pp) with a homozygous plant having white flowers (pp). What percentage of offspring will be purple?
What is 50%
500
DDT is an insecticide. When it was first used it was very very effective. What is one reason this insecticide might have lost its effectiveness over time?
What is insects surviving the insecticide and becoming resistant, being able to reproduce successfully
500
What will the balanced equation look like for:
__Ca(OH)2 (aq) + ___CO2(g) --> ___CaCO3 (s) + ___H2O (l)?
What is 1:1:1:1
500
You have a transverse wave that has a positive amplitude of 2 cm, and a negative amplitude of -2cm. The period is 1 second. A composite wave is formed when a second wave interferes with the original wave. The amplitude of the composite wave is 0cm (both positive and negative). What does the second wave look like?