Answer:
880.5
Explanation:
Express the result of adding 856.6g and 23.86g to the correct number of significant figures.
856.6 +23.86 = 856.6 + 23.9 = 880.5
The result of adding 856.6 g and 23.86 g after rounding off to correct significant figures is 856.6 + 23.9=880.5.
What are significant figures?Significant figures are used for establishment of a number which is presented in the form of digits. These digits give a meaningful representation to the numbers.
The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.There are rules for counting significant figures which are as follows:
1)All non-zero digits are significant .
2)All zeroes which occur between non-zero digits are significant.
3)All zeroes to the left and right of a non-zero digit are not significant.
4) All zeroes on right of decimal are significant if a non-zero number follows them.
5)All zeroes on right side of non-zero digit are significant.
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An atom has the following electron configuration.
1s22s22p63s23p64s2
How many valence electrons does this atom have?
Answer:
2
Explanation:
4s2 has 2 valence electrons
Valence shell is the shell which is the outermost shell, that is filled in the last, before valence shell is penultimate shell. Therefore 2 valence electron are there in the valence shell.
What is element?Element generally consist of atoms or we can say atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
From our question the electronic configuration of element is given as
1s²2s²2p⁶3s²3p⁶4s²
Valence electron is the one which is present in the outermost shell or orbit. So, form above electronic configuration we can say that 4 is the outermost shell and in this shell 2 electron is present. Therefore 2 electron are there in the valence shell as valence electron.
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If an HPLC procedure is running at a pressure of 5.48×10^8 Pa what is it’s running pressure in torr
1 question hurry as fast as possible no link
Answer: ELEMENT
Explanation:
why the back torn of camel is important?
The back torn of Camel is important because it acts as a storage facility for
fats.
Camels are found in desert regions where there is scarcity of
Food WaterThis makes the food it eats to get stored at the back in the hump
region as fats so as to enable it survive long periods of unavailability of food.
The fats are gradually metabolized into nutrients which is used by the body
cells to ensure adequate energy availability and optimal survival.
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Which of the following statements is true?
Select one:
a. All the answers are right
b. Aerobic and anaerobic bacteria don’t decompose organic matter
c. Aerobic bacteria produce bad smelling compounds
d. Anaerobic bacteria produce oxygen as one of their decomposition products
e. Anaerobic bacteria function in the absence of oxygen
Pick the correct answer!
1. Why does the octet rule apply primarily to main-group elements, not to transition metals?
a. The octet rule states that main-group elements tend to react so that they attain a halogen electron configuration.
b. The octet rule states that transition metal-group elements tend to react so that they attain a noble gas electron configuration.
c. The octet rule states that main-group elements tend to react so that they attain a ionic electron configuration. d. The octet rule states that main-group elements tend to react so that they attain a noble gas electron configuration.
Answer:
I think it would be b. The octet rule states that transition metal group elements tend to react so that they attain a noble gas electron configuration.
True or false? Suppose you have two identical birthday balloons, with one filled with the gas helium and the other blown up by you. Assuming they're both filled to the same amount, these balloons will have the same number of molecules.
Answer:
True!
Explanation:
Avogadro’s law means that if we compare the number of helium molecules and the number of air molecules needed to inflate the same balloon, we would find the numbers the same.
The balloon filled with helium air, and the one blown by oneself with the same amount of air have the equivalent number of molecules. Thus, the given statement is true.
What is the relation between moles and atoms?The moles are given as the mass of the compound with respect to the molar mass. According to the Avogadro's law, the 1 mole of a substance has the presence of the atoms equivalent to the Avogadro number.
In the balloons filled with oneself and individual there is same amount of gas, thus have same moles and thereby the number of molecules will be same in both the balloons. Thus, the given statement is true.
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Which of these is the condensed structural formula for an alkane with four carbon
atoms?
O CH3CH2CH2CH3
H
HLH
1C
H
C2
LH
I
C
HTH Н
H
0-I
I
क
H
OCH3CHCHCH3
OC-C-C-C
Answer:
First option
Explanation:
The option that says CH3CH2CH2CH3 is the correct option (I hope that I am right because the order of the answers is not very clear :/)
When comparing an electron's ground state with that of its excited state; which is the
higher entropy and which is the lower entropy? Provide a brief explanation as to why?
HINT: Remember the relationship of the electron to its nucleus!
When comparing an electron's ground state with that of its excited state;
The higher entropy is at its excited state.The lower entropy is at its ground state.Discussion:
Entropy is simply defined as the degree of randomness otherwise termed disorderliness in a system.
Electrons in their ground state are localized and have lower energy. As such, the entropy is lower.
On the contrary; Electrons in their excited state are delocalized and have higher energy. As such, the entropy is higher.
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Science 5th grade very PLZ answer correctly TYSM WILL MARK AS BRAINLIST IF ANSWERED TODAY!
Answer:
A
Explanation:
Conducts electricity:
-Steel
-Gold
-Copper
-Aluminum
Does not conduct electricity:
-Plastic
-Glass
-Rubber
-Wood
Metallic bonding causes metals to conduct electricity. Some metals are more highly conductive than others.
Hope this helps :)
Answer:
The first table correctly classifies the materials.
Explanation:
In table 1, all the elements on the left side are transition metals, expect for steel. Steel is not an element, it's an alloy (Which is a combination of two or more elements).Transition metals are very good conductors of heat and electricity. The reason why transition metals make such good conductors is because their outer electrons can move freely in their atom.
The right side of table 1 correctly classifies the materials that do not conduct electricity. The reason why those materials are poor conductors is because they all have their electrons tightly bound to their atoms.
In table 2, it classifies copper has a poor conductor which is wrong. It also classifies wood as a good conductor which also wrong for the reasons I stated above.
A solution is prepared by dissolving 15.0 g of pure HC2H3O2 and 25.0 g of NaC2H3O2 in 775 mL of solution (the final volume). Incorrect answer icon Incorrect. Did you use the correct form of the H-H equation
A student wants to show the transfer of heat energy without matter which investigation design would best help the student
A) an investigation of radiation through a current in a fluid
B) an investigation of radiation through electromagnetic waves
C) an investigation of conduction through collisions between particles in space
D) an investigation of conduction through the movement of particles through a solid
Answer:
C
Explanation:
According to the concept of thermal energy, transfer of heat energy can be depicted by investigation of conduction through collisions between particles in space.
What is thermal energy?Thermal energy is defined as a type of energy which is contained within a system which is responsible for temperature rise.Heat is a type of thermal energy.It is concerned with the first law of thermodynamics.
Thermal energy arises from friction and drag.It includes the internal energy or enthalpy of a body of matter and radiation.It is related to internal energy and heat .It arises when a substance whose molecules or atoms are vibrating faster.
These vibrating molecules and atoms collide and as a result of which heat is generated in a substance , more the collision of particles , higher is the thermal energy.
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A bike with mass of 10 kg is moving with a speed of 5 m/s. What is the magnitude of its momentum?
Answer:
The momentum is then (10 kg)(5 m/s)= 490.5 kg-m/s
Explanation:
Answer is A
Wyndirbu lie the following best describes the role played by
hydraulic fluid a hydraulic machine?
А
A source of fuel
B
A medium for the transfer of force
С
A coolant
D
A cleaning agent
Help pls
The role played by hydraulic fluid in a hydraulic machine is as a medium for
the transfer of force.
Hydraulic fluid is used primarily in a hydraulic machine for the transfer of
force from one point to another. This makes the system able to perform the
required functions.
Hydraulic fluid also has other functions such as being a coolant and as a
cleaning agent(removal of contaminants) which aren't its major function.
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Which two metals shown won't make a solid when combined with anything? 2.2.2
Answer:
aluminum Zicam iron
Explanation:
Which metals dont react with anything?
Metals like aluminium, iron and zinc do not react either with cold or hot water. But they react with steam to form the metal oxide and
When 0.717 g of sodium metal is added to an excess of hydrochloric acid, 7450 J of heat are produced. What is the enthalpy of the reaction as written?
2Na(s)+2HCl(aq)⟶2NaCl(aq)+H2(g)
Answer:
The enthalpy change of the reaction is 4.78 × 10⁴ J.
Explanation:
We are given that 0.717 g of sodium metal reacts with hydrochloric acid to produce 7450 J of heat.
Converting grams of sodium to moles:
[tex]\displaystyle 0.717 \text{ g Na} \cdot \frac{1 \text{ mol Na}}{22.99 \text{ g Na}} = 0.0312 \text{ mol Na}[/tex]
And dividing the amount of heat produced by the moles of sodium reacted yields:
[tex]\displaystyle \Delta H = \frac{7450 \text{ J}}{0.312 \text{ mol Na}} = 2.39 \times 10^4 \text{ J/mol Na}[/tex]
Because the given reaction has two moles of sodium metal, we can multiply the above value by two to acquire the enthalpy change of the given reaction:
[tex]\displaystyle \Delta H = 2\text{ mol Na}\left(2.39 \times 10^4 \text{ J/mol Na}}\right) = 4.78 \times 10^4 \text{ J}[/tex]
In conclusion, the enthalpy change of the reaction is 4.78 × 10⁴ J.
explain why water wasn't used in crackers?
which has the shorter bond lengths in Alkane,alkene and alkynes
Answer:
alkanes
Alkynes have the strongest bond. Followed by alkenes and then alkanes. This is because in alkynes there are 3 bonds between at least two carbons
What is a peninsula?
Answer:
A peninsula ( Latin: paeninsula from paene "almost" and insula "island") is a landform surrounded by water on most of its border while being connected to a mainland from which it extends.
Explanation:
CAN I GET BRAINLIEST
How many atoms are in mercury phosphate
Answer:
There are 95 atoms in mercury phosphate
Explanation:
You just add the atomic number for both elements
People use solution of Na3PO4 to clean walls before putting up wall paper. If the entration is 1.7% (m/v). What mass of Na3PO4 is needed to make 2L of solution?
Answer:
34 grams
Explanation:
Assuming m/v means mass of solute / volume of solvent, then set up the equation:
1.7/100=m/2000, by cross multiplication, m=34 grams
the role of haemoglobin in the transport of oxygen and carbon dioxide
Hemoglobin with bound carbon dioxide and hydrogen ions is carried in the blood back to the lungs, where it releases the hydrogen ions and carbon dioxide and rebinds oxygen. Thus, hemoglobin helps to transport hydrogen ions and carbon dioxide in addition to transporting oxygen.
Calculate the molarity of a solution prepared by diluting 165 mL of
0.700 M calcium chloride to 900.0 mL.
Answer:
The product of transcription is RNA, which can be encountered in the form mRNA, tRNA or rRNA while the product of translation is a polypeptide amino acid chain, which forms a protein.
Explanation:
What is the limiting reactant from this equation
Answer:
A Option is the correct answer.
Explanation:
To what energy level do the electrons drop when visible light is produced?
Answer: The energy of the photon is the exact energy that is lost by the electron moving to its lower energy level. When the electron changes from n=3 or above to n=2, the photons emitted fall in the Visible Light region of the spectra
which one is not allotropes of carbon?
Answer:
B. Activated Carbon
Explanation:
The rows in the periodic table are called periods. What is true about elements in the same period?
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
The Correct choice is ~ B
Their atomic numbers increase 1 from left to right ~
name 2 elements that are liquid at room temperature and describe their colour
Answer:
Bromine
Mercury
Bromine (symbol Br and atomic number 35) is a reddish-brown liquid, with a melting point of 265.9 K. Mercury (symbol Hg and atomic number 80) is a toxic shiny silvery metal, with a melting point of 234.32 K.
A containing vessel holds a gaseous mixture of nitrogen and butane. Thepressure in the vessel at 126.9 Cis 3.0 atm. At 0 C, the butane completelycondenses and the pressure drops to 1.0 atm. Calculate the mole fraction of nitrogenin the original gaseous mixture.
A vessel that contains a mixture of nitrogen and butane has a pressure of 3.0 atm at 126.9 °C and a pressure of 1.0 atm at 0 °C. The mole fraction of nitrogen in the mixture is 0.33.
A vessel contains a gaseous mixture of nitrogen and butane. At 126.9 °C (400.1 K) the pressure is due to the mixture is 3.0 atm.
We can calculate the total number of moles using the ideal gas equation.
[tex]P \times V = n \times R \times T\\\\n = \frac{P \times V}{R \times T} = \frac{3.0 atm \times V}{0.082 atm.L/mol.K \times 400.1 K} = 0.091 mol/L \times V[/tex]
At 0 °C (273.15 K), the pressure due to the gaseous nitrogen is 1.0 atm.
We can calculate the moles of nitrogen using the ideal gas equation.
[tex]P \times V = n \times R \times T\\\\n = \frac{P \times V}{R \times T} = \frac{1.0 atm \times V}{0.082 atm.L/mol.K \times 400.1 K} = 0.030 mol/L \times V[/tex]
The mole fraction of nitrogen in the mixture is:
[tex]X(N_2) = \frac{0.030 mol/L \times V}{0.091 mol/L \times V} = 0.33[/tex]
A vessel that contains a mixture of nitrogen and butane has a pressure of 3.0 atm at 126.9 °C and a pressure of 1.0 atm at 0 °C. The mole fraction of nitrogen in the mixture is 0.33.
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Consider the unbalanced chemical equation:
H2SO4 (aq) + Fe(OH)3 (S) → Fe2(SO4)3 (S) + H2O (L)
A volume of 38.0 mL of aqueous H2SO4 solution was required to
react completely with 0.685 g Fe(OH)3 (molar mass = 106.8 g/mol)
to produce Fe2(SO4)3. Calculate the molar concentration of the
H2SO4 solution.
A) 0.253 M
B) 0.344 M
C) 0.214 M
D) 0.301 M
E) 0.175 M
The answer is A. The explanation is in the image.
On the top of the image where it just says equation:, that is part of the sentence "First we need to balance the equation:"