You are concerned about the rate of death in catfish your aquaculture operation in tanks that have a high amount of algae growth. You collect some of the algae and send it to the university to have it identified. You find that it is a blue-green alga called Anabaena. Anabaena is known to be toxic to fish. You design an experiment to test how much of the algae the fish can stand before they die. You obtain 6 large aquariums (all the same size) and fill them with water taken from a healthy catfish pond at your operation. You put each aquarium on the same bench in the laboratory, where the light and temperature values are identical. You let the water stand for one day before starting the experiment. In aquarium 1, you add 2 grams of algae and no fish. In aquarium 2, you add 20 small catfish and no algae. Aquarium 3 gets 20 catfish and 2 grams of algae, #4 gets 20 catfish and 4 grams of algae, #5 gets 20 catfish and 8 grams of algae, and aquarium #6 gets 20 catfish and 16 grams of algae. The aeration rate of each aquarium is identical. You make two observations at the same time each day for two weeks. You keep track of the numbers of fish in each tank that die. What is the problem? What is your hypothesis? What is the independent variable? What is the dependent variable?
Answer:
Problem: How does the amount of algae (anabaena) affect or cause the number/rate of catfish death
Hypothesis: IF there is a high amount of algae growth, THEN the rate at which catfishes die increases.
Independent variable: Amount in grams of algae
Dependent variable: Number of catfishes that die.
Explanation:
A scientific experiment starts with an observed problem or a question which can be tested. In this experiment, the rate of death of catfish in an aquaculture due to the high amount of algae (anabaena) growth is observed, hence, it is the problem. It will be asked as a question: HOW DOES THE AMOUNT OF ALGAE IN A TANK CAUSE THE RATE AT WHICH CATFISHES DIE.
Formualting an Hypothesis is the next step of a scientific method. Hypothesis is a testable explantation or suggested solution to the observed problem or asked question. A hypothesis of this experiment can be: IF THERE IS A HIGH AMOUNT OF ALGAE GROWTH, THEN THE RATE AT WHICH CATFISH DIE INCREASES.
Next is to test the hypothesis by conducting an experiment. In an experiment, the independent variable is the variable that the experimenter changes or manipulates in order to bring about a response. In this experiment, the independent variable is the AMOUNT IN GRAMS OF ALGAE ADDED TO EACH AQUARIUM.
On the other hand, the dependent variable is the variable being tested or measured in an experiment. In this experiment, the dependent variable is the NUMBER OF CATFISH THAT DIE.
Describe how the proton, electron and neutron were experimentally discovered.
1. Write the name meaning
a. 0.1 gram
b. 0.01 meter
c. 0.000001 liter
e. 1000 000 grams.
L. 10 meters
Answer:
A.. 0.1 gram this means 0.0001kg of the object in SI unit
b. 0.01 meter this means 1 / 10 of 1 meter of the measurement
c. 0.000001 liter this means 1/10000 of the quality of liquid in SI unit
e. 1000 000 grams.this means 1000kg of the object in IS unit
L. 10 meters this means 10 times one meter of the measurement in SI unit
Choose the nonmetallic elements from the list. Check all that apply yttrium: oxygen: boron: polonium: argon: gallium: carbon:
Answer:
Oxygen, Argon, and Carbon.
Explanation:
Just finished the assignment.
Oxygen ,boron and carbon are the non metallic elements. Thus, options B, C, and G are correct.
What are non metallic elements?Non-metallic elements are the elements which easily form negative ions by accepting or gaining electrons and which do not have complete electronic configuration like rare gas. Non metals have high ionization energies and electronegativity.
They are generally poor conductors of heat and electricity. Solid non metals are generally brittle, with little or no metallic lustre.
Most non metals have the ability to gain electrons easily. Non metals display a wide range of chemical properties and reactivities.
In above except oxygen, boron and carbon all other elements are metallic in character that possess metallic property. Thus, options B, C, and G are correct.
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What does the mass of an object depend on?
A. Force of gravity
B. Temperature of the object
C. Time taken of an event to occur
C. Amount of matter that makes up the object
Answer:
D or the 4th one
Explanation:
mass is literally the measure of matter in an object which is essentially the weight or how much stuff there is.
Answer:
C:)
Explanation:
What is an experimental error
Answer:
Explanation: errors in judgment of an observer when reading the scale of a measuring device to the smallest division. 2. Environmental. For example, unpredictable fluctuations in line voltage, temperature, or mechanical vibrations of equipment.
Which image below shows the correct way to convert 0.828 kilometers to meters
Explain the rationale and what happens to the units.
Answer:
A
Explanation:
Because you need to multiply the length value by 1000
Soda has a density pf 1.05 g/mL. What is the mass of 2000 mL of soda?
A. 2100 g
B. 1905 g
C. 0.0005259
D. 2005 g
Answer:
The answer is option AExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 2000 mL
density = 1.05 g/mL
The mass of soda is
mass = 2000 × 1.05
We have the final answer as
2100 gHope this helps you
Why does the flow of science just keep going
Answer:
The Flow of science keeps going because not everything is fully discovered yet. New things are discovered everyday and are also made better as well.
Explanation:
18. The density of rubbing alcohol is .789 g/ml. What is the mass of rubbing alcohol in a 500-ml bottle of rubbing alcohol?
Answer:
The number of milliliters of isopropyl alcohol that are in a 400 ml bottle of this solution is 280 Ml
Explanation:
% V/V = volume of solute/ volume of solution x 100
Let the volume of solute be = y ml
the volume of solution = 400 ml
convert 70% to fraction = 70/100
by substituting the value in the equation
= y ml/ 400 ml = 70/100
by cross multiplication
100y =400 x70
100y= 28000
y= 280 ml
what is the function of spines ?
Answer:
The spine is also designed to protect your spinal cord. The spinal cord is a column of nerves that connects your brain with the rest of your body, allowing you to control your movements. Without a spinal cord, you could not move any part of your body, and your organs could not function.
5.
2. Which of the following statements
indicates that a new substance is
forming?
a. A liquid is changing to a solid
b. Metal is melting
C. A substance is fizzing or
bubbling
d. A liquid evaporating to a gas
Answer:
A. A liquid is changing to a solid
hope this helps
Name 2 gram negative bacteria often found in contaminated food
The mass spectrum of a sample of a pure element is shown above. Based on the data, the peak at 26amu represents an isotope of which of the following elements?
A) Al with 13 neutrons
B) Mg with 14 neutrons
C) Fe with 26 neutrons
D) Ti with 26 neutrons
Answer:
The answer is B
The correct answer is option B: Mg with 14 neutrons
The mass spectrum shows the charge to mass ratio of atoms. I can be used to sort the isotopes of an element.
Isotopy is a phenomenon in which atoms of the same element have the same atomic number but different mass numbers.
The mass spectrum of atoms separates atoms on the basis of charge to mass ratio of the isotopes.
The isotopes of magnesium are; 24Mg atom which has 12 neutrons 25Mg which has 13 neutrons, and 26Mg which has 14 neutrons.
Hence, the peak at 26amu represents 26Mg which has 14 neutrons.
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A student estimated a mass to be 275 g but upon carefully measuring it found the actual mass to be 260 g. what is the percent error in the estimation?
Answer:
5.77% Error.
Explanation:
Given an experimental value of 275 g , and a theoretical value of 260 g, the percent error can be found using the equation:
[tex]\% \: error \: = \frac{ |theoretical \: value \: - \: experimental \: value | }{theoretical \: value} \times 100[/tex]
% Error = ( | 260 - 275 | / 260 ) × 100 = ( | - 15 | / 260 ) × 100 = ( 15 / 260 ) × 100 = 1500/260 = 300 / 52 = 5.769230769230.. ≈ 5.77%
A certain ore is 20.7% nickel by mass. How many kilograms of this ore would you need to dig up to have 70.0 g of nickel?
Answer:
0.3382 kg
Explanation:
From the illustration:
100g of the ore would contain 20.7 g of nickel by mass. In order to obtain 70.0 g of nickel, the amount of the ore needed would be:
100 x 70.0/20.7 = 338.16 g
According to conversion units:
1 g = 0.001 kg
Hence,
338.16 g = 338.16 x 0.001 = 0.3382 kg
Therefore, 0.3382 kg of the ore would be required in order to obtain 70.0 g of nickel.
Amount of core in Kilogram is 0.338 kg (Approx.)
Given that;Percentage in every ore = 20.7%
Amount of nickel = 70 gram
Find:Amount of core in Kilogram
Computation:Amount of core in Kilogram = Amount of nickel / Percentage in every ore
Amount of core in Kilogram = 70 / 20.7%
Amount of core in Kilogram = 70 / 0.207
Amount of core in Kilogram = 338.16 gram
Amount of core in Kilogram = 0.338 kg (Approx.)
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what is the molar mass of CO^2
Answer:
44.01 g/mol
There you go, hope it helped!!!!!
. The freezing point of an aqueous solution containing a nonelectrolyte solute is – 2.79 °C. What is the boiling point of this solution?
Answer:
Boiling point of the solution is 100.78°C
Explanation:
This is about colligative properties.
First of all, we need to calculate molality from the freezing point depression.
ΔT = Kf . m . i
As the solute is nonelectrolyte, i = 1
0°C - (-2.79°C) = 1.86 °C/m . m . 1
2.79°C / 1.86 m/°C = 1.5 m
Now, we go to the boiling point elevation
ΔT = Kb . m . i
Final T° - 100°C = 0.52 °C/m . 1.5m . 1
Final T° = 0.52 °C/m . 1.5m . 1 + 100°C → 100.78°C
Mixing two clear liquids results in the formation of a whit solid. Is this a physical or chemical change?
Answer:
Chemical Change
Explanation:
It became white and became solid which makes it a chemical change.
what is emprical evidence
Answer:
the correct answer is
Empirical evidence is the information received by means of the senses, particularly by observation and documentation of patterns and behavior through experimentation. The term comes from the Greek word for experience,
Explanation:
hope this helps you!!
Use the table to identify the phase and phase changes of the elements under the given conditions. Write the name of the substance, phase, or phase change.
When the temperature in a room increases from
25°C to 33°C,
changes from a solid
to a liquid.
In a lab, methane and nitrogen are cooled from
-170°C to -200°C. The methane freezes and the
nitrogen
.
When gold is heated to 2,856°C it changes from a liquid to a
.
Answer: gallium, condenses, gas
Explanation: took assignment on edge
Answer: gallium, condenses, gas
Explanation: took assignment on edge
Which of these limiting factors is MOST likely to affect low-growing plants in a tropical forest? Group of answer choices air water shelter sunlight
Answer:
air, water, sunlight
Explanation:
A limiting factor may be defined as a environmental condition or a resource that can limit the plant growth as well as distribution or the abundance of an organism or its population within the ecosystem. The ability of any plant species to grow and spread throughout any geographic area is the direct result of the adaption to its biotic and abiotic components of that region.
Some of the factor that affect the plant growth are : sunlight, air, proper temperature, moisture, nutrients, wind,etc.
The lack of the any one of the above essential component will determine the health of the plant.
the boiling point of a sample of pure water is found to be 102.6 degrees Celsius instead of 100 degrees Celsius at sea level state two factors that may have been resulted to this change
Answer:
Because the atmospheric pressure at higher altitudes is lower than at sea level.
Water, or any liquid for that matter, boils when its vapor pressure equals the external pressure above the liquid.
Alchemy is a branch of ancient knowledge that states lead metal is a form of gold metal. Which of these best explains whether alchemy is a science or pseudoscience? It is a science because ancient knowledge is often reliable. It is a science because metallurgy is known to be a branch of science. It is pseudoscience because ancient knowledge is mystical yet reliable. It is pseudoscience because each metal is known to be a unique element.
The best statement among the following which explains whether alchemy is a science or pseudoscience is "It is pseudoscience because each metal is known to be a unique element." Hence, Option (D) is correct.
What is Alchemy ?
Alchemy began to fully evolve into chemistry in the 17th century, with a greater emphasis on rational thought and experimentation and less emphasis on spirituality and mysticism.
The alchemists were never successful in changing lead into gold, but modern nuclear physics can accomplish this task.
Therefore , The best statement among the following which explains whether alchemy is a science or pseudoscience is "It is pseudoscience because each metal is known to be a unique element." Hence, Option (D) is correct.
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A reaction expected to produce 245.6 g of a product produces 122.1 g of the
product. What's the percent yield?
Answer:
50%
Explanation:
% yields =(experimental yields / theoretical yields ) x100%
= 122.1÷ 245.6 ) x100% = 50%
The temperature of a container of oxygen gas is increased from 149 k to 298 k which of the following statement is true
Answer:
______is used in production of hard disk.
Explanation:
Convert 78.9 kJ into calories
(can you also explain how pls, ty <3)
Answer:.1 kJ = 1000 J and 1J=0.24cal
----->78.9kJ=1000x78.9x0.24=18936cal
Explanation:
This is the unit regulated by the scientific community and they follow the formula that they prove
Find 1.635 x 3.2 please help will mark brainlyest
Answer:
5.232
Explanation:
My favorite student weighs in at 125 pounds. How many
kilograms do they weigh?
Answer:
56.69905
Explanation:
The conversion factor from pounds to kilograms is 0.45359237, which means that 1 pound is equal to 0.45359237 kilograms.
how many seconds are there in 45 days?
Answer:3,888,000seconds
Explanation:
60secx60minsx24 hoursx45days=3,888,000