The scientific method attempts to minimize the influence of bias or prejudice in the experimenter. Even the best-intentioned scientists can't escape bias. It results from personal beliefs, as well as cultural beliefs, which means any human filters information based on his or her own experience.
Why We Write Chlorine As Cl2 Not As Cl
Round to 3 significant figures.
21.4501
Answer:
it is twenty-one point four five zero one or 2.14501 × 101.
Explanation:
your welcome
If the volume of water is 8.0 ml and it changes to 10 ml when aluminum is added, what is the volume of the aluminum?
Answer:
2 mL.
Explanation:
From the question given above, the following data were obtained:
Volume of water = 8 mL
Volume of water + Aluminium = 10 mL
Volume of Aluminium =?
The volume of aluminium can be obtained by calculating the difference between the volume of the water + aluminium and the volume of water. This is illustrated below:
Volume of aluminium = (Volume of water + Aluminium) – (volume of water)
Volume of water = 8 mL
Volume of water + Aluminium = 10 mL
Volume of Aluminium = 10 – 8
Volume of Aluminium = 2 mL
Therefore, the volume of aluminium is 2 mL.
is pellet of sodium is cut into two parts physical or chemical change?
Answer:
physical change
Explanation:
the cutting doesnt change the chemical structure of the sodium
The boiling point of water is 100°C. During an experiment, water came to a boil at 97°C according to the thermometer that was being used. What is the percent error of the thermometer?
Answer:
The percent error of the thermometer is 3%
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The boiling point of water is 100°C. During an experiment, water came to a boil at 97°C. The percent error of the thermometer is -3 %
What is the percent error?
Percent error is the error of the percentage of the calculation. It is calculated by subtracting the actual value from the expected value and dividing it by the expected value. So the formula will be:
The actual value is the value that is cone by doing the experiment. The calculation that is come in the experiment.
The expected value is the pre-estimated values that are estimated before the experiment.
Percent error = actual value - expected value / expected value x 100
The actual value = 97°C
The expected value = 100°C.
Putting value in the formula
97 - 100 / 100 x 100 = -3
Thus, the percent error of the thermometer is -3 %
To learn more about percent error, refer to the link:
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Wood is burned in a campfire. Determine the type(s) of energy present before and after the reaction.
Answer: when you burn something every action has a reaction. so if you put wood in the fire the wood would burn up into this coal like block once completely burnt through. after there is no more wood left to burn the fire would slowly die and there would just be the remains of the wooden block.
how many eggs are produced at a time in human body?
Answer: Well, at birth, there are approximately 1 million eggs. And at the time of puberty, only 300,000 remain.
Explanation:
Answer:
only one egg will be produced by a single ovary in a month. the ovaries function in an alternate manner., ie., one ovary will release an egg in one month and the other ovary will release the ovum next month.
are carbon atoms alive and why? (plz)
Answer:
yyes they are lovely . . . . .
Answer:
No they are not alive
Explanation:
Since they are just atoms how would they be alive? They also make up all living things so how would they be made of themselves
1g=100cg 1lb=454g 1lb=16oz how many centigrams are in 0.13 oz
Answer:368.875 cg
Explanation:
0.13oz (1lb/16oz) (454g/1lb)(100cg/1g)= 368.875 cg
When 1 mol of glucose is burned, 2802.5 kJ of energy is
released. If the daily energy intake for a normal young adul
is 9 Mj, What mass (in grams) of glucose must be burned to
produce this amount of energy ?
Answer:
2
Explanation:
What are some complex impurities found in water that are hard to detect and remove? How are they removed and detected? Please answer ASAP!!!
This are my answers to your quesion
When working in laboratories and hospitals, it’s crucial that any contaminants found in water are removed immediately, before they cause any damage.
Each impurity carries its own risks to chemical and biological research, not to mention the detrimental effect they cause to the quality of pure water. Here we discuss the 8 main types of water contaminants, and how they can be prevented.
1. Microorganisms
Bacteria, algae and fungi all regularly interfere with sterile research applications. Bacteria can adversely influence cell and tissue culture by competing at enzyme-active sites on substrates.
If free-floating bacteria form biofilms on surfaces, they can be extremely difficult to remove. These biofilms can grow for several years, spontaneously releasing bursts of bacteria, along with their associated endotoxins and nucleases.
These nucleases then break down DNA and RNA in samples, and the endotoxins will have a negative effect on the growth and function of cells.
2. Viruses
Viruses – referred to as non-living nucleic acids – adversely affect tissue and cell growth. They’re extremely small, with most of them falling between 0.01 – 0.3 microns, and they can survive for long periods of time. Once they’ve been spotted in water, they should be removed as soon as possible.
3. Pyrogens
For mammalian cell cultures, and the preparation of solutions or devices that will later have contact with humans and other mammals, it’s crucial that the water used is pyrogen-free.
The most significant component of pyrogens – a form of endotoxin – is lipopolysaccharides (LPS), which is derived from Gram-negative bacteria walls. If LPS gets into the blood or spinal fluid, it can be toxic and cause a fever.
4. Dissolved Inorganic Ions
Silicates, chlorides, calcium, fluorides, magnesium, phosphates, bicarbonates, sulphates, nitrates and ferrous compounds are all forms of dissolved inorganic ions.
The instability in water caused by these ions will negatively influence chemical and biological reactions. Results include the formation of protein-protein and protein-lipid interaction, altering enzymatic activity, and delaying the growth of cells and tissue.
5. Dissolved Organic Compounds
These are derived from animal and plant decay, in addition to any human activities that involve the introduction of alcohol, protein, pesticides, chloramine, herbicides or detergents into the environment.
Dissolved organic compounds interfere with high performance liquid chromatography (HPLC), gas chromatography and fluoroscopy.
6. Dissolved Gases
Water contains naturally dissolved carbon dioxide, nitrogen and oxygen, but these gases can alter the pH of lab water, which upsets the ionic balance. Concentrations of oxygen and nitrogen can affect the rate of biochemical reactions; and high concentration of dissolved gases can cause a bubble formation, which obstructs the flow through chromatography columns and micro-channels.
Dissolved carbon dioxide raises water acidity, reducing the capacity of ion exchange resins in DI systems.
7. Suspended Particles
When large suspended particles of clay, sand, silt or vegetation between 1 – 10µm are found in water, they cause turbidity and settle at the bottom.
Suspended particles can foul reverse osmosis membranes, filters and chromatography columns, especially if the system stems from a reservoir or tank within the building.
8. Colloidal Particles
Colloidal particles are much smaller than suspended particles, at just 0.01 – 1.0µm, and they don’t settle.
Colloidal particles regularly interfere with analytical techniques, and bypass ion exchange resins, which result in lower resistivity in DI water.
How to Prevent Contaminants
The main way to prevent and remove contaminants are through water purification systems. Different technologies have been created, each specialising in the removal of specific contaminants.
For example, whilst the process of distillation won’t remove ionised gases, inorganic ions or dissolved non-ionised gases, they will filter out bacteria and pyrogens.
Reverse osmosis (RO) is hailed as one of the most effective ways of removing contaminants, as this process removes up to 99% of impurities in water. Dissolved organics and ionics, suspended impurities, bacteria and pyrogens are all removed from water when RO is used.
To conclude, contaminants can be very damaging to water. Once found, they should be removed as soon as possible, using the most effective form of water purification technology.
All unauthorized experiments are prohibited. True or false
Answer:
true....................
N 2 , O 2 , and Cu are elements. True False
Answer:
True
Explanation:
N2 is nitrogen.
O2 is oxygen.
CU is copper.
They are all elements. Hope this helps!
What does population density indicate? ______
Answer:
number of individuals
Explanation:
calculated by dividing the number of people by area
Answer:
It indicates the ammount of individuals per unit square area
Explanation:
If you have 500 people in a 500 squared miles the population density would be 1 person every one squared mile.
list the visble colors short to longest wavelengths in the electromagnetic spectrum
Answer:
Explanation:
ROYGBIV
Red=>Orange=>Yellow=>Green=>Blue=>Indigo=>Violet rays
At most, how many covalent bonds can a phosphorous atom form?
(A) 1
(B2
(C)3
(D)4
Answer:
(c)
Explanation:
in both black and red
Answer:
I think 3 im am not sure
Explanation:
In the Inca civilization what was the quipo used for?
It involved knots in strings called quipu. The quipu was not a calculator, rather it was a storage device. Remember that the Incas had no written records and so the quipu played a major role in the administration of the Inca empire since it allowed numerical information to be kept.
Hey guy I have presentation tomorrow on sodium . Can u give me ideas how to present it. So that students feel joy and easily understand
Answer:
first you could say did you know that you 3% of sodium in sprit but the good thing is that sodium wont make you gain any pounds if it weren't for sodium all are food wouldn't be preserved we would be eating unpreserved food witch could really hurt your body.
Explanation:
hope it helps
If some paper and/or paper-like materials ignite and cause a very small fire at your lab table, you should?
Explanation:
For an effective use of a laboratory with protection and safety for all, there must be rules and policies that must be strictly disseminated and followed by anyone who uses a laboratory for a specific purpose, such as the use of specific clothes and goggles.
However, in the event of a small fire, the ideal is to notify the laboratory instructor, and exit the emergency exits in an orderly and quick manner.
If some materials ignite and cause a small fire you should c. pour water on it or use wet paper towels to put it out.
In the lab there are many guidelines and precautions that must be taken to ensure that things like fire do not happen but sometimes it cannot be helped.
If some materials like paper or paper-like materials ignite and cause a small fire you should put it out quickly by:
pouring water on it or,using wet towels because the fire would be very small.In conclusion, put the fire out as soon as possible using water or a small paper towel so that it doesn't spread.
Find out more at https://brainly.com/question/3409761.
Options for this question include:
a. sound the building alarm and evacuate the area
b. sound the building alarm and then use the fire extinguisher
c. pour water on it or use wet paper towels to put it out
d. run out of the room
A student bought a statue made up of copper. after a couple of months it acquired a dull green coating, explain the reason with a formula
Why might carbon-13 be more abundant than carbon-14 despite them both being
isotopes?
Answer:
The reason carbon-13 is more abundant than carbon-14 despite them both being isotopes is because carbon-13 is stable and doesn't decay into other elements, unlike carbon 14.
Explanation:
Carbon isotopes come in three forms. By far the most common isotope of carbon is carbon-12 (12C), which contains six neutrons in addition to its six protons. The next heaviest carbon isotope, carbon-13 (13C), has seven neutrons. Both 12C and 13C are called stable isotopes since they do not decay into other forms or elements over time. The rare carbon-14 (14C) isotope contains eight neutrons in its nucleus. Unlike 12C and 13C, this isotope is unstable, or radioactive. Over time, a 14C atom will decay into a stable product.
Need a little help with chemistry :)
*if you don’t know, don’t answer*
Answer:
1.33 moles
Explanation:
Answer:
8.00 x 10^23 / 6.02 x 10^23
Explanation:
sorry dont have my calculator but if you put it in you will get the answer
What is an element?
What is it represented by?
What is it made up of?
Give an example
Answer:
what is an element?
element is a pure substance which cannot be broken down by chemical means
what is it represented by?
By its symbol and atomic number
what is it made up off?
It is made up of it's owm type of atom.
Example
carbon,oxygen,hydrogen,gold,silver,iron
What effect does distance have on the force of gravity? (2 points) a Increasing the distance between two objects increases the gravitational force. b Decreasing the distance between two objects decreases the gravitational force. c Increasing the distance between two objects decreases the gravitational force. d Distance is not a factor in determining the force of gravity.
Answer:
The answer is increasing the distance between two objects decreases the gravitational force. which is C
Explanation:
HELP ASAP PLEASE 75POINTS
Answer: it's a
Explanation:
A molecule of ethanol has two carbon atoms, six hydrogen atoms, and one oxygen atom. A ball-and-stick model of a molecule of ethanol is made from the following components: one red ball two black balls six white balls eight sticks What do the black balls in the model represent? (1 point) oxygen atoms carbon atoms bonds between atoms hydrogen atoms
what are the answers
Explanation:
got this and dont know what it is
The correct answer is- The black balls represent carbon atoms.
Molecular models are three dimensional representations of a a molecule that enables us to visualize the molecule.
Molecules are represented by three dimensional models. These models help us to really have a firm grasp of what the molecule should look like.
In this particular question, we are told that ethanol has two carbon atoms, six hydrogen atoms, and one oxygen atom.
Also, we have; one red ball two black balls six white balls eight sticks What do the black balls in the model.
This implies that the two black balls must represent carbon atoms from the information provided.
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13) Water is 88.8% oxygen by mass. What mass of water contains 32.0 g of oxygen? A) 36.036 g B) 36.04 g C) 36.0 g D) 28.4 g E) 28.42 g F) 28.416 g
Answer:
Option A. 36.036 g
Explanation:
From the question given above, the following data were obtained:
Percentage of oxygen in water = 88.8%
Mass of oxygen = 32 g
Mass of water =..?
Mass of water that contains 32 g of oxygen can be obtained as follow:
Percentage of oxygen = mass oxygen /mass of water × 100
88.8% = 32/mass of water
88.8 /100 = 32/mass of water
Cross multiply
88.8 × mass of water = 100 × 32
88.8 × mass of water = 3200
Divide both side by 88.8
Mass of water = 3200/88.8
Mass of water = 36.036 g
Therefore, the mass of the water that contains 32 g of oxygen is 36.036 g
how do you do this? i got 48 yards but 16 feet isn't 48 yards so what am i doing wrong?
Answer:
16 feet is 5.3 repeating yards
Explanation:
How many moles are in 5.3 X 10^6 atoms of Calcium (Ca)?
Answer:
8.801×10^-18 moles Ca
Explanation:
5.3 X 10^6atoms* (1mol/6.022*10^23) = 8.801×10^-18 moles Ca
What is mutualism? Give two
examples.
Answer:
mutualism describes the ecological interaction between two or more species where species has a net benefit. 2. The doctrine that mutual dependence is necessary to social well-being
Explanation:
