Answer:
Explanation:
B. Cut flowers placed in sugar water stay fresh longer than flowers
placed in regular water.
Answer:
B
Explanation:
Just got question right on quiz!!! <3
All unauthorized experiments are prohibited. True or false
Answer:
true....................
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
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:
HELP ASAP PLEASE 75POINTS
Answer: it's a
Explanation:
Which of the following elements has the greatest metallic character?
Rb
Mo
Au
B
Answer:
Au. fifififiof
Explanation:
djdjdjndsksidndndnendnnd
Answer:
Rb
Explanation:
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.
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.
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:
ANALYZE A ball of clay is manipulated into different shapes in each of the images
below. Does the amount of mass and matter in each of the images below change as
the size and shape of the clay ball is changed? Explain your reasoning.
Answer:
The amount of mass and matter in all the transformations of the clay ball will remain the same or constant
Explanation:
From the law of conservation of mass we have, for an enclosed system to and from which there is no transfer of matter or energy, mass cannot be created nor destroyed, and remains constant at the given value, but the matter which make up the mass can be changed into different forms
Therefore, the clay ball can be transformed into different shapes and will still posses the same initial mass before the transformation, provided there are no transfer of matter or energy from the clay ball system.
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.
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
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
2) 2,047m2 + 42m = ?
Answer: It's 2,089m2
Explanation:
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:
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%
Please give me the brainliest if you find this helpful
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:
https://brainly.com/question/3670306
#SPJ2
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.
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
what happens first during cellular respiration
Answer:
glcolysis
Explanation:
Glcolysis uses glucose to create ATP within the cytoplasm of the cell.
Answer:
the answer is glycolysis
Explanation:
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.
The dimensions of water tank are 1.0 m wide by 3.25 m long by 1.50 m tall what is the volume of the water tank t
Answer:
4.9 m^3
Explanation:
volume= 1.0 x 3.25 x 1.50= 4.875 -> 4.9m^3
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:
can someone pls help
Answer:
1.2km=1,200,000! hope this helps
Round to 3 significant figures.
21.4501
Answer:
it is twenty-one point four five zero one or 2.14501 × 101.
Explanation:
your welcome
A sample of helium gas has a volume of 1.25 L and a temperature of 22 °C, under a constant pressure. What is the new volume if the temperature is increased to 45 °C?
Answer:
the new volume is 1.35L
Explanation:
The computation of the new volume in the case when the temperature rises to 45 degrees is shown below:
GIven that
Volume = 1.25L
And, the temperature is 22 degrees celsius
So, [tex]T_1[/tex] = (275 + 22)k
= 297 k
Now
[tex]T_2[/tex] = (275 + 45)k
= 320 k
Now as it is a constant pressure
So, the new volume is
[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2} \\\\V_2 = \frac{V_1}{T_1}\times T_2 \\\\= \frac{1.25}{297}\times 320[/tex]
= 1.35L
hence, the new volume is 1.35L
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!
Which of the following is NOT a trait of a scientist?
We
Curiosity
O Creativity
Logical
O inaccurate
Answer:
I think inaccurate is not a trait.
Explanation:
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
What is an organism and microorganisms?plz help ASAP!
You are a marine biologist who wants to study what type of zooplankton (microscopic animals that live in the ocean and feed larger organisms) inhabit a particular area of the Pacific Ocean. You have taken your samples, but now need to collect your data. What advantage would using a compound light microscope have over using a dissecting microscope? can anyone help me
Answer:
The advantage of the compound light microscope over the dissecting microscope is the magnification power of the telescope. Compound light microscope magnifies from 40x up to 1,000x while dissecting microscope magnifies up to 40 x only. In this regard, more magnification power is advantageous to view smaller objects.
