Why would a biological stain be used? (Give examples of stains and their uses)
Answer:
Biological stains are used for the medical and biological industries to aid in detection of structures within tissues. This can include the detection of abnormalities, but is not limited to that. The stains are used to define and examine cell populations within the tissues, to mark cells, or to flag proteins.
How many joules of heat are needed to heat at 13.00 grams of water from
55.00 °C to 93.00 °C.
-2065 J
5054 J
2065 J
2989 J
Answer: the third one 2065
Explanation:
q= (13g)(4.18)(38)
q=2064.92 ≈ 2065
Which formula represents a hydrocarbon?
Answer:
methane-CH4
have a good day
The total energy radiated by a blackbody depends on.
Explain the difference between oxidation and digestion
meaning: oxidisation occurs when an element is oxidised or losses electrons. major example: rusting of iron.
meaning: digestion is the break down of food molecules into nutrients which the body later uses for energy, development, cell repair, etc. major part of digestion occurs in small intestine and begins from mouth.
Answer:
Oxidation releases energy from the food for us to use and occurs when an element is oxidized or loses electrons.
Digestion is the breakdown of food small enough to be absorbed by the cells. It turns the molecules into nutrients which the body later uses for energy, development, cell repair, etc. The digestion process occurs in the small intestine and begins from the mouth.
In conclusion, this shows how they are different.
Explanation:
What is the leaving group when converting a carboxylic acid to an ester?.
Answer:
Hydroxyl group of the carboxylic acid is destined to leave and the oxygen of the alcohol moiety stays with its hydrogen destined to leave.
Hope this helps, please let me know if I'm wrong.
Give reasons for the following the given statements:
a) If you throw a ball upwards, it comes down.
b) Cars will move but it is not living things.
Explanation:
a.) the ball comes back down because of the gravitational pull
b.)the car is non living because it runs on a engine (man made)
What determines how much an air parcel will cool?
Answer: As long as the parcel is unsaturated (relative humidity < 100% or whenever the dew point temperature of the parcel less than the temperature of the parcel ), the rate of cooling is 10°C for every 1000 meters the parcel is lifted. As a rising parcel cools, its relative humidity increases.
How to determine how long a branch is with mass and torque.
Answer:
First determine the lever arm and then multiply it times the applied force.
The equation τ = m(r^2)α is the rotational analog of Newton's second law (F=ma)
Hope this helps.
Type the correct answer in the box. Given: SiO2 4HF → SiF4 2H2O In this chemical reaction, how many grams of HF are needed for 182 grams of SiO2 to react completely? Express your answer to three significant figures. The reaction requires grams of HF.
The mass of the substance is the product of the molar mass and the moles of the substance in the compound. The amount of the HF required in the reaction is 242 gm.
What is the relation of the mass and moles?Mass is given as the product of the moles of the substance and of the molar mass of the substance in the compound.
Given,
Molar mass of Silicon dioxide = 60g/mol
mass of Silicon dioxide = 182 g
Molar mass of HF = 20 g/mol
Moles of the Silicon dioxide can be calculated as,
[tex]\begin{aligned}\rm Moles &= \rm \dfrac{mass}{molar\;mass}\\\\&= {182}{60}\\\\&= 3.03\end{aligned}[/tex]
The balanced chemical reaction can be shown as,
[tex]\rm SiO_{2} + 4HF \rightarrow SiF_{4} + 2H_{2}O[/tex]
From the reaction, it can deduce that,
1 mole of silicon dioxide reacts with 4 moles of HF
So, 3.03 moles of silicon dioxide reacts with 12.12 moles of HF
Mass of HF can be calculated as,
[tex]\begin{aligned}\text{mass of HF} &= \rm moles \times \rm molar \; mass\\\\&= 12.12 \times 20\\\\&= 242 \;\rm g\end{aligned}[/tex]
Therefore, the reaction requires 242 gm of HF.
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Can someone help me balance this equation please?
Br2 + S2O32– + H2O → Br1– + SO42– + H+
Explanation:
Br2 + S2O32- + 5H2O –> 2Br- + 2SO4 + 10H+ + 6e
What amount of moles does 60.5 L of carbon dioxide occupy at 50.5 kPa and 20 degrees C?
n = PV=RT
where
n = number of mole
p = pressure = 2.15 ATM
v = volume = 60.5L
r = 0.0821 atm (L)/ mol(K)
t = temperature = 25°+273.15=298.15 kelvin
Replacing with the values given
n = 2.15(60.5)/0.0821(298.15)=5.3 mole.
How many grams of solid calcium hydroxide are in 250mL of a 1. 5M solution
What is the counter interval and the relief of this topographic map
Answer:Individual contour lines on a topographical map are a fixed interval of elevation apart known as a contour interval. Common contour intervals are 5, 10, 20, 40, 80, or 100 feet. The actual contour interval of a map depends upon the topography being represented as well as the scale of the map.
why is zinc oxide not used to investigate this property of hydrogen gas
I think zinc is not used into inverstiagte with hydrogen gas because it is non-porous in nature which causes it to have a slow reaction
Explanation:
Because Zinc is more reactive than Hydrogen
hich statement
is true?
Select one:
a. Matter consists of only large
molecules.
b. Matter is made up of only charged
particles.
c. The particles of matter have zero
kinetic energy and potential energy.
d. The particles of matter are arranged
in different ways for the different
states.
Answer:
d. The particles of matter are arranged
in different ways for the different
states.
Explanation:
when you hear kinetic think hot or cold
example
water when its hot its a gas and looks different under a microscope
water when its cold its ice and looks different under a microscope
What is the F-Xe angle in the molecule - F; Xe * F_{2} (Xe has three lone pairs of electrons )?
The molecule has a Linear shape with a bond angle of 180 degrees.
What is bond angle?Bond angle refers to the dihedral angle between two atoms that are connected to the same central atom. The central atom in this case is Xe.
We are told that there are three lone pairs of electrons that surround Xe. It then follows that the molecule has a Linear shape with a bond angle of 180 degrees.
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A dog has a total of 78 chromosomes. Through the process of meiosis, new cells are
created. How many chromosomes would the parents' cells have?
Why put aluminum foil on door knobs when you are alone.
Aluminum foil on door knobs when we want to paint a door to avoid paint stains
Aluminum foil UsageAluminium is an element of the periodic table with an atomic number 13.
Now, When painting alone, aluminum foil is used in wrapping doorknobs, and this practice is done to keep paint off.
The usage aluminum foil is an efficient way of keeping away paint from touching door knob
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Explain the practical significance of scientists being able to estimate the products of a reaction before it is performed.
The practical significance of scientists being able to estimate the products of a reaction before it is performed is to evaluate the result without performing any experiment that requires huge capital.
Significance of estimation of productsBeing able to predict chemical reactions is an important skill for scientists which provides valuable information about the reaction such as products of the chemical reaction. This information is used to structure their presentation and results.
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as a puck falls its potential energy decreases why
Answer:
because its getting converted into another form of energy, as the puck is falling its increasing its velocity at a rate which decreases its potential energy and increases its frictional energy which then converts to kinetic energy as it hits an object or the floor.
Explanation:
How many grams are there in 3.3 x 1023 molecules of N2I6?
Answer:
The number of grams is 434.5 g.
Explanation:
Why can't we make matter disappear?
No, matter never disappears as it follows the law of conservation and matter changes it form from one shape to another.
Matter is something which has both mass and shape . There are generally considered three states of matter which are solid , gas and liquid . The matter is consists of small particles known as atoms .
Matter can never disappear as it follows the law of conservation in which the chemical and physical alterations cause the matter to change in any other form but it is conserved which states that before and after the change has occurred the quantity of matter is always exactly the same .
Variations in temperature or pressure can cause all three forms of matter to change into one another as matter can change its shape .
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After anaerobic exercise, lactic acid is converted to pyruvic acid, which enters the ____________ pathway and can be used for energy
Answer:
body
Explanation:
because if latic acid is conveted to pyruvic acid.
A starfish opening a clam is physical change or chemical change?
Answer: Physical change
Explanation: Quite simple as the starfish opening a clam would mean the starfish is physically changing the clams look.
A starfish opening a clam is a chemical change because opening a clam will be done by the secretion of saliva from the starfish that will open the clam.
What are physical and chemical changes?The term “physical change” refers to a change in an object's appearance. When there is a change in the surroundings of the object, such as a rise in temperature or pressure, a physical change takes place.
When candles are burned, the wax melts, but as soon as the temperature drops, the wax hardens and solidifies once more.
A chemical change is a change that can be done by a reaction between two substances that can come in contact. A starfish is opening a clam to eat the clam, it can be done by the mouth which secretes an enzyme that will open the clam.
Thus, a starfish opening a clam is a chemical change.
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Which property is the basis of the purification technique recrystallization?.
What is the diffrance between atomic orbital and energy levels?
which of the following molecules would have the lowest boiling point? C4H10 C3H8 C2H6 CH4
Answer:
CH4
Explanation:
this would have the lowest boiling point as it has the least amount of intermolecular forces and is the smallest molecule and would be easier to break apart rather than the higher boiling points (C4H10 etc)
hope this helps
The change shown in the photo involves which two energy transformations?
A. Chemical energy -> electromagnetic energy
B. Thermal energy -> electrical energy
C. Chemical energy -> thermal energy
D. Thermal energy -> chemical energy
Answer:The answers are both D,B
Explanation: Hope its right!
Answer:
It should be A and C
Explanation:
What is scientific notation, and why it is useful for reporting scientific measurements?
