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Home Q & A Board Science-Related Homework Help High School Level Science
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Chem 30-help needed-lab
Chem 30-help needed-lab
Observations:
Cell 1
Zn(s) │Zn2+(aq) ║ Cu2+(aq) │Cu(s)
 Anode
Zn(s)--->Zn2+(aq)
Cathode
Cu2+(aq)--->Cu(s)
Reduction Half Rxn
Cu2+(aq) + 2e- --->Cu(s)
Oxidation Half Rxn
Zn(s) --->Zn2+(aq)
Anonymous   314   5 Replies
A week ago
Distribution Patterns and Population Size Estimates (Bio 30)
Distribution Patterns and Population Size Estimates (Bio 30)
1. Examine the three diagrams of hypothetical moose populations. What are the two different distribution patterns shown?

2. The shaded parts of the diagrams represent the transects that were used to sample each population. calculate the ar
 12
keight   10251   16 Replies
A month ago
For the cross in Part B, predict the frequencies of each of the phenotypes in th
For the cross in Part B, predict the frequencies of each of the phenotypes in th
For the cross in Part B, predict the frequencies of each of the phenotypes in the F1 progeny, and determine the genotype(s) present in each phenotypic class.
 12
mariphu   54995   15 Replies
6 months ago
After analyzing the above graphs, identify hormone P and provide an explanation for your choice.
After analyzing the above graphs, identify hormone P and provide an explanation for your choice.
1. after analyzing the above graphs, identify hormone P and provide an explanation for your choice. (2marks)

2. after analyzing the graphs (3marks)
a. identify hormone R (1 mark)
b. provide an explanation for your choice (1mark)
ScienceGeek99   10363   7 Replies
7 months ago
When you remove electrons from a metal cup, the cup becomes
When you remove electrons from a metal cup, the cup becomes
When you remove electrons from a metal cup, the cup becomes
A) negatively charged.
B) positively charged.
C) ionized.
Navyseal   240   4 Replies
A year ago
A dominant allele, T, codes for the ability to taste the compound phenylthiocarbamide (PTC). People ...
A dominant allele, T, codes for the ability to taste the compound phenylthiocarbamide (PTC). People ...
1. A dominant allele, T, codes for the ability to taste the compound phenylthiocarbamide (PTC). People who are homozygous for the recessive allele, t, are unable to taste PTC. In a genetics class of {y} students, and 3 cannot taste the PTC. How many
manbearpig   1015   2 Replies
A year ago
Chem 30-assignment help needed
Chem 30-assignment help needed
Use the following information to answer question 3
Ethanol is the alcohol found in beer, wine, and whiskey. In the production of ethanol, the starch in barley, grapes, or corn is reacted to form glucose in the presence of enzymes. During the fer
Anonymous   310   3 Replies
A year ago
In a class experiment, the strength of a neural stimulus and the resulting muscle contraction are ...
In a class experiment, the strength of a neural stimulus and the resulting muscle contraction are ...
In a class experiment, the strength of a neural stimulus and the resulting muscle contraction are compared. A single motor neuron that synapses with a muscle fibre is suspended. The other end of the muscle fibre is attached to a mass. If an electrica
 12
princess001   9715   18 Replies
A year ago
Which row identifies correctly the excitatory and inhibitory neurons?
Which row identifies correctly the excitatory and inhibitory neurons?
in an experiment two muscles were electrically stimulated and their responses were noted. Muscle fibte 1 was found to have a threshold stimulus of 32mV. In a seperate investigation, a student stimulated these same two neurons with an electrical probe
EA   2343   2 Replies
A year ago
Blood - Body's Reaction to Temperature Change
Blood - Body's Reaction to Temperature Change
   Place your response to this activity below. You will be marked according to your explanation of the body’s response to the two given situations. You must include references to vasoconstriction, vasodilation, countercurrent heat exchange, and periphe
caileigh5095   4019   8 Replies
A year ago
Photosynthesis and cellular respiration
Photosynthesis and cellular respiration
 Dinitrophenol (DNP) is a chemical that interferes with the production of ATP in both chloroplasts and mitochondria. In an attempt to identify the minimal concentration of DNP required to inhibit ATP production, DNP was applied to separate suspension
 12
Bordeen   4669   18 Replies
A year ago
If this generators coils were to spin, which graph represents the voltage that the generator could ...
If this generators coils were to spin, which graph represents the voltage that the generator could ...
If this generators coils were to spin, which graph represents the voltage that the generator could produce

** please see attached photo
A)
B)
C)
D)
angie19   628   1 Reply
A year ago
Chem 30- homework question-help needed please
Chem 30- homework question-help needed please
5.   Use   the   half-reaction   method to   balance   the   following   chemical   reaction   that   takes   place   
in   acidic   solution:

chemical reaction attached

file:///home/chronos/u-74553375ff89f5ab28217a3a4a83e2d2c643be82/MyFiles/Downloads/
Anonymous   233   3 Replies
Anonymous
A year ago
An astronomical unit is the average distance between the Sun and ___________.
An astronomical unit is the average distance between the Sun and ___________.
An astronomical unit is the average distance between the Sun and ___________.*
2 points
Earth
Mars
Neptune
Venus
vhlt   217   1 Reply
A year ago
A small, icy object that develops a glowing tail as it nears the Sun.
A small, icy object that develops a glowing tail as it nears the Sun.
A small, icy object that develops a glowing tail as it nears the Sun.*
2 points
satellite
comet
asteroid
meteorite
aros   202   1 Reply
A year ago
Chem 30help needed please
Chem 30help needed please
3. Aqueous iron (III) nitrate and aqueous tin (II) bromide are mixed.

a) List all the species present and identify the SOA and SRA
                 




b) Write the oxi
Anonymous   259   4 Replies
Anonymous
A year ago
Are the cities near the equator warmer because they have more hours of daylight each year?
Are the cities near the equator warmer because they have more hours of daylight each year?
Are the cities near the equator warmer because they have more hours of daylight each year?
fishstick98   145   1 Reply
A year ago
Which statement BEST describes the differences between weather and climate?
Which statement BEST describes the differences between weather and climate?
Which statement BEST describes the differences between weather and climate?I really need help, please please please please please please please please
wingw1   183   1 Reply
A year ago
Ms. Avari is having trouble lifting the 1000N kettlebell. If Ms. Avari does not have enough force ...
Ms. Avari is having trouble lifting the 1000N kettlebell. If Ms. Avari does not have enough force ...
[html]Ms. Avari is having trouble lifting the 1000N kettlebell.  If Ms. Avari does not have enough force to lift it all the way up 4 flights of stairs to her apartment, she can use a simple machine to help her move the kettlebell up to the 4th floor.
jgonzo   191   1 Reply
A year ago
A construction worker uses a board and log as a lever to lift a heavy rock. If the input arm is 5 ...
A construction worker uses a board and log as a lever to lift a heavy rock. If the input arm is 5 ...
A construction worker uses a board and log as a lever to lift a heavy rock. If the input arm is 5 meters long and the output arm is 2 meters long, what is the mechanical advantage of the lever?
joshkitty   144   1 Reply
A year ago
If a machine requires an input of 5000 Joules of input to do 2500 Joules of work, what is the ...
If a machine requires an input of 5000 Joules of input to do 2500 Joules of work, what is the ...
If a machine requires an input of 5000 Joules of input to do 2500 Joules of work, what is the efficiency of the machine?
jjboy817   153   1 Reply
A year ago
Put the following scenarios in order from the most work done to the least amount of work done.
Put the following scenarios in order from the most work done to the least amount of work done.
[html]Put the following scenarios in order from the most work done to the least amount of work done.Reorder answers
1.An object is lifted straight off the ground
Reorder answers
2.An object is pushed 5 meters with a force of 7 Newtons
Reord
gogopuff   117   1 Reply
A year ago
Which of the following are examples of levers? Check all that apply.
Which of the following are examples of levers? Check all that apply.
Which of the following are examples of levers? Check all that apply.a
seesaw
 b
axe
 c
rolling pin
 d
scissors
 e
slide
 f
bicycle
xmargarette   129   1 Reply
A year ago
What are two examples of Class two levers? Choose all that apply
What are two examples of Class two levers? Choose all that apply
What are two examples of Class two levers? Choose all that applya
scissors
 b
wheelbarrow
 c
hammer and nail
 d
bottle opener
 e
shovel
le_onyx   142   1 Reply
A year ago
Mechanical advantage is calculated by using the formula:
Mechanical advantage is calculated by using the formula:
Mechanical advantage is calculated by using the formula:a
Normal Force/ Acceleration
 b
Length of Slope (L) / Height of slope (H)
 c
Height of Slope (H) / Length of Slope (L)
 d
Force of Friction/Gravity
heyboo   158   1 Reply
A year ago
Which of the following would increase the mechanical advantage of an inclined plane?
Which of the following would increase the mechanical advantage of an inclined plane?
[html]Which of the following would increase the mechanical advantage of an inclined plane?a
you cannot increase mechanical advantage
 b
increasing the incline of the plane
 c
decreasing the length of the plane
 d
increasing the length of th
skhan7   165   1 Reply
A year ago
A construction worker uses a board and log as a lever to lift a heavy rock. If the input arm is 5 ...
A construction worker uses a board and log as a lever to lift a heavy rock. If the input arm is 5 ...
A construction worker uses a board and log as a lever to lift a heavy rock. If the input arm is 5 meters long and the output arm is 2 meters long, what is the mechanical advantage of the lever?a
7
 b
0.4
 c
10
 d
2.5
zenmamma   120   1 Reply
A year ago
A child makes a ramp to push his toy dump truck up to his sandbox. If he uses 5 newtons of force to ...
A child makes a ramp to push his toy dump truck up to his sandbox. If he uses 5 newtons of force to ...
[html]A child makes a ramp to push his toy dump truck up to his sandbox. If he uses 5 newtons of force to push the 12-newton truck up the ramp, what is the mechanical advantage of his ramp?MA = Output Force/Input Force

 a
2.4
 b
60
 c
17
 
Kristian11x   161   1 Reply
A year ago
A truck has a wheel that has a radius of 60 cm. The axle that powers the wheel has a radius of 10 ...
A truck has a wheel that has a radius of 60 cm. The axle that powers the wheel has a radius of 10 ...
A truck has a wheel that has a radius of 60 cm. The axle that powers the wheel has a radius of 10 cm. What is the mechanical advantage of the truck wheel?a
4
 b
1/6
 c
1/4
 d
6
jayala1   139   1 Reply
A year ago
Machines can have an efficiency of 100%.
Machines can have an efficiency of 100%.
Machines can have an efficiency of 100%.True
 False
Kristian11x   125   1 Reply
A year ago
Which of the following are examples of work being done on an object? Choose the 4 that apply.
Which of the following are examples of work being done on an object? Choose the 4 that apply.
[html]Which of the following are examples of work being done on an object? Choose the 4 that apply.a
Carrying a bag of groceries to the car
 b
Holding a 25 kg barbell over your head
 c
Lifting a bag of groceries
 d
Pushing on a car that wil
thrina   158   1 Reply
A year ago
A car jack with a mechanical advantage of 10 needs to produce an output force of 200 N to raise a ...
A car jack with a mechanical advantage of 10 needs to produce an output force of 200 N to raise a ...
A car jack with a mechanical advantage of 10 needs to produce an output force of 200 N to raise a car. The input force required is
dbp10   124   1 Reply
A year ago
A wheelbarrow can be used to help lift a load, such as a pile of dirt, and then push the load across ...
A wheelbarrow can be used to help lift a load, such as a pile of dirt, and then push the load across ...
A wheelbarrow can be used to help lift a load, such as a pile of dirt, and then push the load across a distance. What two simple machines make up the wheelbarrow?
markinhosmiami   173   1 Reply
A year ago
If Ms. Avari has to carry a stack of books that have a weight of 14.75 N up a 12 m height staircase, ...
If Ms. Avari has to carry a stack of books that have a weight of 14.75 N up a 12 m height staircase, ...
If Ms. Avari has to carry a stack of books that have a weight of 14.75 N up a 12 m height staircase, how much work will she be doing?(W = F x d)
gnikme2   152   1 Reply
A year ago
Charlie lifts a box with a force of 500 N and sets it on a table top 1.2 m above its starting ...
Charlie lifts a box with a force of 500 N and sets it on a table top 1.2 m above its starting ...
[html]Charlie lifts a box with a force of 500 N and sets it on a table top 1.2 m above its starting position. Lauren pushes an identical box up a 5 m ramp from the floor to the top of the same table. Which person did more work?a
Lauren did
jrah   162   1 Reply
A year ago
How does the pulley make work easier?
How does the pulley make work easier?
[html]How does the pulley make work easier?a
It changes the mass of the piano, making it easy to raise
 b
It changes the direction of the force applied to raise the piano
 c
It changes the duration of time to raise the piano
 d
It changes t
afret   135   1 Reply
A year ago
Match the unit with what it measures.
Match the unit with what it measures.
Match the unit with what it measures.Column A
1.
joule:
joule
2.
newton:
newton
3.
meter:
meter
basehead48   122   1 Reply
A year ago
Andrea is building a birdhouse. She hammers a nail in the wrong place and needs to remove it. She ...
Andrea is building a birdhouse. She hammers a nail in the wrong place and needs to remove it. She ...
[html]Andrea is building a birdhouse. She hammers a nail in the wrong place and needs to remove it. She uses the back of her claw hammer to hold the nail and pushes the handle to remove the nail, as shown in the diagram.Andrea is using the
tytykimani23   220   1 Reply
A year ago
What is the mechanical advantage of the class 1 lever?
What is the mechanical advantage of the class 1 lever?
What is the mechanical advantage of the class 1 lever?Input = Effort

Output = Load

 a
6
 b
21,600
 c
216
 d
.00138
 e
60
dbp10   167   1 Reply
A year ago
True or False:
True or False:
True or False:A lever produces more work with less effort.

 True
 False
gnikme2   152   1 Reply
A year ago
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