The uncalibrated portion of a Burette is known as
The stopcock is the uncalibrated portion of a burette.
What is a burette?A burette is an instrument use in quantitative analysis which has opening at both ends and a tap at one end and it is use to measuring volume of liquid in the laboratory.
Therefore, The stopcock is the uncalibrated portion of a burette.
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What is the temperature, in degrees Celsius, of a substance with a temperature of 49K?
5. Why does temperature go down when you remove CO2?
Answer:
It is harmful gas which cause global warming
How many grams of sodium chlorate(nacio3) are in 1.23 x10^23 representative particles?
Answer:
About 21.7 grams.
Explanation:
To find the mass of a sample of sodium chlorate (NaClO₃) given the amount of particles present, we can convert from particles to moles, and moles to mass using its molecular weight.
The molecular weight of sodium chlorate is:
[tex]\displaystyle \begin{aligned} \mathcal{M}_\text{NaClO$_3$} &= (22.99 + 35.45 + 3(16.00)) \text{ g/mol} \\ \\ & = 106.44\text{ g/mol} \end{aligned}[/tex]
And recall that in one mole of any substance, there are 6.02 × 10²³ of it. Hence:
[tex]\displaystyle \begin{aligned} 1.23\times 10^{23} \text{ NaClO$_3$} &\cdot \frac{1\text{ mol NaClO$_3$}}{6.02\times 10^{23}\text{ NaClO$_3$}} \cdot \frac{106.44\text{ g NaClO$_3$}}{1\text{ mol NaClO$_3$}} \\ \\ &= 21.7 \text{ g NaClO$_3$} \end{aligned}[/tex]
In conclusion, there are about 21.7 grams of sodium chlorate.
What are communication skills??
Answer:
Communication skills are the abilities you use when giving and receiving different kinds of information. Some examples include communicating new ideas, feelings or even an update on your project. Communication skills involve listening, speaking, observing and empathising. It is also helpful to understand the differences in how to communicate through face-to-face interactions, phone conversations and digital communications like email and social media.
Explanation:
Answer:
The definition. Communication skills enable individuals to understand others and to be understood themselves. A variety of aspects are important in the context of these skills, such as listening, speaking, observing and empathy.
what is the difference between soft water and hard water
Answer:
soft water can leath with soap whiles hard water cannot be leathers with soap
Answer:
Hard water is water with excess calcium and magnesium, while soft water lacks harsh minerals that can hurt your body.
Explanation:
Also, in hard water, soap is not so effective (little or no foam) and in soft water soap is easily effecive (foams easily).
) experimental evidence indicates that the nucleus of an atom
a) contains most of the mass of the atom
b) contains a small percentage of the mass of the atom
c) has no charge
d) has a negative charge
d) This is because they contain equal numbers of positive protons and negative electrons. These opposite charges cancel each other out making the atom neutral.
Write the nuclear equation for the beta decay Ni-60
[tex]^6^0_2_7CO\;\rightarrow\;^6^0_2_8Ni\;+\;^0_-1e[/tex] is the nuclear equation for the beta decay Ni-60.
What is beta decay?Beta-decay occurs when, in a nucleus with too many protons or too many neutrons, one of the protons or neutrons is transformed into the other.
The nuclear equation for the beta decay Ni-60
[tex]^6^0_2_7CO\;\rightarrow\;^6^0_2_8Ni\;+\;^0_-1e[/tex]
In beta minus (β−) decay, a neutron is converted to a proton, and the process creates an electron and an electron antineutrino; while in beta plus (β+) decay, a proton is converted to a neutron and the process creates a positron and an electron neutrino. β+ decay is also known as positron emission.
Hence, [tex]^6^0_2_7CO\;\rightarrow\;^6^0_2_8Ni\;+\;^0_-1e[/tex] is the nuclear equation for the beta decay Ni-60.
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In an ionic bond, metals lose electrons to become _____.
Answer:
In an ionic bond, metals lose electrons to become Cations.
Explanation:
Metal atoms lose electrons to form positive ions (cations).
what's Electro magnetic radiation?
Answer:
a kind of radiation including visible light, radio waves, gamma rays, and X-rays, in which electric and magnetic fields vary simultaneously.
How much sample will remain after 40 days for as 200 g sample of Radon-222? The half-life of Radon-222 is 4 days.
Answer:
[tex]\boxed{N_t =0.1953125 \: grams}[/tex]
Explanation:
Formula:
[tex]N_t = N_0( { \frac{1}{2} })^{ \frac{t}{t_ \frac{1}{2} } } [/tex]
Where Nt is the amount of substance remaining after time t,
N0 is the amount of substance at time t = 0,
t is the time at which we have to find out how much substance disintegrated from t = 0 to t = t
& t_1/2 is the half life corresponding radioactive sample.
Given:
N0 = 200g
t= 40 days
t1/2 = 4 days
To find:
Nt =?
Solution:
Substituting given data in above formula,
[tex]N_t = N_0( { \frac{1}{2} })^{ \frac{t}{t_ \frac{1}{2} } } \\ N_t = 200( { \frac{1}{2} })^{ \frac{40}{4 } } \\ N_t = 200 \times 0.0009765625 \\ \boxed{N_t =0.1953125 \: grams} [/tex]
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What isotope has 45 protons and 57 neutrons
…Answer:
Explanation:
Part D
Based on your research, which source of energy do you think best meets the needs of society? Defend your answer in 50 to 100 words.
Energy is the fundamental need for lives. Fossil fuel is the energy source that is most needed in society. It is now replaced with solar energy as fossil fuels are nonrenewable resources.
What is the non-renewable and renewable source?Nonrenewable resources are energy sources that are finite in amount and get depleted after some time as it takes millions of years to produce these resources. Fossil fuels though are needed but are nonrenewable and cause pollution.
Solar energy is a renewable source that is present in abundant and infinite quantity and does not get depleted fast after they are used excessively. They are also environmentally friendly and do not produces much pollution.
Therefore, fossil fuel and solar energy are the most demanded sources.
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what happens when you mix hydrogine, potassium and sodium
Answer:
-
Explanation:
As the piece of metal skitters across the surface of the water in a beaker and — particularly in the case of potassium — it appears to catch fire, it is not obvious that the explanation for both phenomena lies in the production of hydrogen gas.
Which type of wave pushes the medium in the direction of the wave? *
A. transverse wave
B. compression wave
C. neither A nor B
D. both A and B
Answer:
Neither because it’s a longitudinal wave that is supposed to be the answer
Explanation:
WILL MARK BRAINLIST!! A chemist weighs a steel cylinder of compressed oxygen, O2, and finds that it has a mass of 1027.8 g. After some of the oxygen is used in an experiment, the cylinder has a mass of 1023.2 g. How many moles of oxygen gas are used in the experiment?
When answering this question include the following:
Explain how you found the mass of oxygen gas.
Explain how to find the molar mass of the compound.
Explain how many significant figures your answer needs to have.
The numerical answer
Answer:
0.14376 moles O₂
Explanation:
To find the amount of moles lost, (1) convert the grams O₂ before to moles (via molar mass from periodic table), then (2) convert the grams O₂ after to moles, then (3) subtract the moles O₂ after from the moles O₂ before.
Molar Mass (O₂) = 2(15.999) g/mol
Molar Mass (O₂) = 31.998 g/mol
Before Experiment:
1,027.8 grams O₂ 1 mole O₂
-------------------------- x ---------------------- = 32.121 moles O₂
31.998 grams
After Experiment:
1,023.2 grams O₂ 1 mole O₂
-------------------------- x ---------------------- = 31.977 moles O₂
31.998 grams
Moles Before - Moles After = Moles Lost
32.121 moles - 31.977 moles = 0.14376 moles O₂
The number of significant figures is determined by the significant figures of the values given. Both of the given values (1,027.8 and 1,023.2) have 5 sig figs. Therefore, the answer should also have 5 sig figs.
why might it be unwise to drink water straight from a pond
Answer:
it is because of the bacteria and different things that go into waters such as ponds, rivers, lakes, seas, oceans, streams, and other body of waters and I should also add the chemicals that go into them as well
Explanation:
1 Defing polymerization
Answer:
Polymerization, any process in which relatively small molecules, called monomers, combine chemically to produce a very large chain-like or network molecule, called a polymer. The monomer molecules may be all alike, or they may represent two, three, or more different compounds.
Explanation:
:^)
If you could travel to any TIME PERIOD, when would go and why.
Answer:
I Would Go Back To When There Were Cavemen Because I Would Love To See How Things Went On And How Women/Men Handled Themselves
Explanation:
Why Would I Travel To When Cavemen Were Here?
Because I Have A Fuji Film And I Would Love To Come Back To This Day And Show Everyone That Cavemen/Dinosoars ARE Real
How would you write 16,340 in scientific notation with 2 significant figures?
Answer:
1.6 x 10^4
Explanation:
16,340
with 2 significant figures is
16000
in scientific notation
is 1.6 × 10^4
because 10^4 means
if you move the decimal point 4 spaces then
1.6 becomes 16000
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When cooking in a convection oven, for best results you place your food in the center of the oven. This is because convection is energy transfer
A. by currents of moving liquid or gas
B. from a reaction system to its surroundings
C. by direct matter contact
D. by electromagnetic waves
This is because convection is energy transfer by currents of moving liquid or gas.
What is heat transfer by convection?
Heat transfer by convection is the transfer of heat from one place to another due to the movement of fluid.
When cooking in a convection oven, for best results you place your food in the center of the oven, this is because convection is energy transfer by currents of moving liquid or gas.
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This is because convection is a type of energy transfer by currents of moving liquid or gas (Option A).
What is convection?Convection is a physical natural phenomenon associated with energy transfer through a fluid.
In convection, a suitable fluid that produces what transfer can be for example air and/or water.
In conclusion, this is because convection is energy transfer by currents of moving liquid or gas (Option A).
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importance of mole ratio in solvey process
Answer:
Sry i accidently clicked on ''SAVE''.
U can remove it or report it...
Explanation:
d. What is being done to save this species
e. An organization/group that is working towards
Create a commercial that showcases why we should save the manta rays
a. Commercials should be about 30seconds-1 minute. No longer than 30
Answer:
the answer is D because they should be asking a question instead of wondering how long the ad is hope this helped.
Joanne added iron filings to copper sulphate solution. she observed the reaction after one week. what is the name of the compound formed in this reaction?
The iron filings react with copper sulfate, the copper is displaced and iron sulfate results.
Copper sulfate + Iron reactionThe reaction between iron filings and copper sulfate is represented by the equation below:
[tex]Fe + CuSO_4--- > FeSO_4 + Cu[/tex]
The iron filings displace the copper from copper sulfate to form iron sulfate. Thus, elemental copper and iron sulfate are formed.
Iron is able to displace copper from copper sulfate because iron ranks higher than copper in the reactivity series.
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19. For the reaction, 2S+ 30=2SO3, how many moles of so3 will be produced from 12.5 g 02 and excess S?
19. For the reaction, 2S+ 30=2SO3, how many moles of so3 will be produced from 12.5 g 02 and excess S?
:
For the reaction: 2S(s) + 3O2 -> 2SO2(g) How many moles of SO3 will be produced from 2.0 mol O2 and excess S?
Answer:
Explanation:
19. For the reaction, 2S+ 30=2SO3, how many moles of so3 will be produced from 12.5 g 02 and excess S?
How do scientists organize dinosaur bones? By type and size. By size and location. By location and type.
Answer:
I'm pretty sure by type and size (I might be wrong).
Green plants are primary consumers. True False
Answer:
The answer is False beacuse, plant are called producers because they make their own food.
A gas occupies a volume of 131.0-mL at 165.2-kPa. What volume will the gas occupy at 170.8-kPa if the temperature remains the same?
The relationship between the pressure and the volume of the gas at a constant temperature is given by Boyle's law. The volume, of the gas at 170.8 kPa is 126.70 mL.
What is Boyle's law?Boyle's law states the inverse relationship between the pressure and the volume of the gas. The formula for the law can be given by:
[tex]\rm P_{1}V_{1} = P_{2}V_{2}[/tex]
Given,
Initial pressure = 165.2 kPa
Initial volume = 131.0 mL
Final pressure = 170.8 kPa
The final volume is calculated as:
165.2 * 131.0 = 170.8 * V
V = 126.70 mL
Therefore, the final volume of the gas is 126.70 mL.
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A semiconductor:
A.
always allows charge to flow.
B.
never allows charge to flow.
C.
cannot be used at normal temperatures.
D.
has characteristics between conductors and insulators.
Answer:
D. has characteristics between conductor and insulator
