Answer:
0.00244g/cm³ (3 s.f.)
Explanation:
The formula of density is [tex]\frac{mass}{volume}[/tex]. We already know the mass is 28.6kg, so we need to find the volume first before calculating the density.
Volume of board = 5.54 cm × 10.6 cm × 199 cm
= 11 700 cm³ (3 s.f.)
Density of board = [tex]\frac{28.6}{11 700}[/tex]
= 0.00244g/cm³ (3 s.f.)
Answer:
d = 0.0024 g/cm³
Explanation:
Given data:
Density of board = ?
Volume = 5.54 cm× 10.6 cm× 199 cm
Mass of board = 28.6 g
Solution:
Formula:
d = m/v
d = density
m = mass
v = volume
Volume = 5.54 cm× 10.6 cm× 199 cm = 11686.1 cm³
d = 28.6 g/ 11686.1 cm³
d = 0.0024 g/cm³
Which experiences a greater effective nuclear charge in a Be atom, the 1s electrons or the 2s electrons? Explai
The 1s electrons experience a greater effective nuclear charge in a Be atom as compared to 2s electrons due to less distance from the nucleus.
Which type of electrons experience great nuclear charge?Those electrons that are present near to the nucleus of an atom experience great nuclear charge while on the other hand, those electrons that are present far from the nucleus of an atom experience smaller nuclear effect of the nucleus. This is because the force of attraction of protons that is present in the nucleus on the electrons that is present around the nucleus in various orbits. We know that 1s electrons are present near to the protons whereas 2s electrons are present far from the nucleus.
So we can conclude that the 1s electrons experience a greater effective nuclear charge in a Be atom as compared to 2s electrons due to less distance from the nucleus.
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Marcel conducts an experiment to test which stain remover works best on mustard stains. He wants to make sure that he does not make mistakes and has correct data in his experiment. What should Marcel do to make sure that his data are correct? conduct a similar experiment with a different washing machine ask other students to conduct related experiments at their homes ask his sibling to conduct the same experiment using his washing machine repeat the experiment several times with the same variable and constants
Answer: Repeat the experiment several times with the same variable and constants.
Explanation: The experimental procedure should be performed many times so as to determine the effect of the stain remover on mustard stain in different conditions and while using different variables such as water and type of machine used. This will tell how useful the stain remover in all conditions provided to check the accuracy of the stain remover.
Hope this help!!! :)
Answer:
C
Explanation:
if his brother does the expire end it is replication if he was to do the same expirement with the same variables then the same outcome would come out
02. Two great pe birds are morati Both birth have a ne
grams and are flying at 90 kilometers per hou BRASIL
ove the ground, and Bird is lying 25 km above the on
Bird
Answer:
I don't understand the question.
Explanation:
HELP NEEDED ASAP
What mass of Al is produced when 0.500 mole of Al2 S3 is completely reduced with excess H2? (At. Masses of Al=27, S=32, H=1)
Select one:
a. 13.5 g
b. 27.0 g
c. 2.7 g
d. 54.0 g
What type of solution is formed when solid sodium hydroxide (NaOH) is dissolved in water?
A) an electrolytic solution, because NaOH will dissociate into ions
B. an electrolytic solution, because NaOH will not dissociate into ions
C) a nonelectrolytic solution, because NaOH will not dissociate into ions
D) a nonelectrolytic solution, because NaOH will dissociate into ions
The statement " an electrolytic solution, because NaOH will dissociate into ions" is correct.
What is electrolytic solution?A solution that contains ions, atoms, or molecules that already have gained or lost electrons and also is electrically conductive is known as an electrolyte solution. They're known as ionic solutions because of this.
NaOH can be considered as electrolyte because sodium hydroxide was soluble in water, it will entirely dissociate into its ions. As a result, it can classify NaOH as a strong electrolyte. When electrolytes are dissolved in water, they form a solution that conducts electricity.
The reaction can be written as:
NaOH (s) + [tex]H_{2}O[/tex] → [tex]Na^{+} +OH^{-} +H_{2}O[/tex]
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What category of elements is characterized by the filling of d orbitals?
Halogens
Alkali Metals
Transition Metals
Alkaline Earth Metals
Explanation:
Transition Metals are characterized by the filling of d orbitals?
At 3 atm of pressure, a cylinder with a movable piston contains 2000 ml of gas. If the pressure
is increased to 8 atm and the temperature remains unchanged, what is the new volume of the
gas?
Answer:
V₂ = 750 mL
Explanation:
Given data:
Initial pressure = 3 atm
Initial volume = 2000 mL
Final pressure = 8 atm
Final volume = ?
Solution:
The given problem will be solved through the Boyle's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
3 atm × 2000 mL = 8 atm × V₂
V₂ =6000 atm. mL / 8atm
V₂ = 750 mL
PLEASE HELP i really need help please
Explanation:
convergent-plate slides beneath the other
divergent-plates move away from each other
transform-2 plates slide past each other
How many electrons are gained in the half-reaction O2 + electrons — 202?
O
A. 2
O
B. 4
o
C. O
o
D. 1
SUBMIT
Answer: B. 4
Explanation:I just took it
I NEED IT TODAY!!!!! (20 Points)
Base your answer on the information below and your knowledge of chemistry.
Methanol can be manufactured by a reaction that is reversible. In the reaction, carbon monoxide gas and hydrogen gas react using a catalyst. The equation below represents this system at equilibrium.
CO(g) + 2H2(g) CH3OH(g) + energy
State the class of organic compounds to which the product of the forward reaction belongs.
Answer:
I think it belongs to a gas type or a liquid type. not sure
I am sorry if you get it wrong
ASAP pleaseee and Thankyou
Answer:
i think 50%
Explanation:
Which of the following organ is NOT part of the Urinary system?
A. Kidney
B. Bladder
C. Brain
D. Urethra
Answer:
Explanation:C
Convert 1.60 x 107 cm to mm in scientific notation
please help
Answer:
4.8x10^9
Explanation:
A galaxy is 650 million light years away. Based on Hubble's Law, how quickly is
that galaxy moving away from us?
a.29.5km
b..33km
c.572km
d.14300km
What is the best method of eye protection in laboratory?
Answer:
goggles
Explanation:
...................
Can someone help me out with this thanks!
Answer:
a) Hydrogen and Fluorine
b) Lithium and Oxygen
c) Potassium and Phosphorus
d) Nickel and Oxygen
e) Mercury and Chlorine
Explanation:
The capital letters in the compounds represent a single element, while some elements have one capital letter and one small letter after it.
a) H & F
b) Li & O
c) K & P
d) Ni & O
e) Hg & Cl
The tire pressure in a automobile tire was 2.38 atm when the tire was at 26°C. As the automobile drove for several hours, the temperature of the tire increased to 93°C.
35 atm
41.0 atm
2.91 atm
3.09 atm
33 atm
Answer:
The answer is 2.91 atm
Explanation:
Which of the following statements best explains the type of chemical reaction represented by Jane's picture?
Answer:
There are no statements. Edit your question and state the statements.
Answer:
There should be a image
Which of the following describes redox in displacement plating?
A) The Metal A ion is oxidized and Metal B is reduced.
B) The Metal A ion is reduced and Metal B is oxidized.
C) Displacement plating does not involve a change in oxidation states.
Answer:
B) The Metal A ion is reduced and Metal B is oxidized.
Explanation:
When we think of electroplating, we often think of a set up in which there is a nonsponteanous reaction driven by the presence of a cell.
However, in displacement plating, a cell is not involved. Metals are chosen based on their respective position in the electrochemical series.
For instance, silver can be coated on copper by immersing the copper rod into a silver ion solution. The copper rod becomes oxidized. The silver ions accept electrons and become deposited on the copper rod.
Air does not have a chemical symbol or formula. Why?
1)It contains different amounts of water depending on where you are.
2)Air is not a pure substance.
3)It depends on the temperature.
4)It depends on how far above sea level you are.
Answer:
2. Air is not a pure substance
Explanation:
Air does not have a chemical symbol or formula because air is not a pure substance (option 2).
What is air?Air is a mixture of different gases. A mixture is a substance that constitutes other compounds that are not chemically bonded together.
This means that air as a mixture is made up of different gaseous components that possess their own individual identity.
Atmospheric air is composed of the following different constituents;
78% nitrogen21% oxygenSmall amounts other gases including carbon dioxide, neon, and hydrogen etc.This shows that air is not a pure substance and accounts for the reason why air does not have a definite chemical formula or symbol.
Therefore, option 2 is correct.
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Which element has the smallest atomic radius?
A-Na
B-H
C-Li
D-K
Answer:
B Hydrogen
Explanation: Hydrogen is the smallest element.
According to the periodic table, which statement
correctly describes the change from a neutral atom
of an element to its ion?
A. A fluorine atom forms a F-' ion by losing
one electron.
B. A sodium atom forms a Nation by losing
two electrons.
C. A magnesium atom forms a Mg+2 ion by
gaining two electrons.
D. A phosphorus atom forms a p- ion by
gaining three electrons
Write the names of the following covalent compounds: SiO2
Answer:
Silicon dioxide
Explanation:
Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO₂, most commonly found in nature as quartz and in various living organisms. In many parts of the world, silica is the major constituent of sand.
The name of the following covalent compound: SiO₂ is silicon oxide.
What is the name of the covalent compound?The name of the covalent compound is silicon oxide. Note that covalent compounds are known for their ability to share electrons. This is the case with the compound, silicon oxide that shares electrons with oxygen.
In the compound, there are two atoms of oxygen and one atom of silicon.. So, the name of the compound is silicon oxide.
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If an object has 25 newtons of force pushing from the left and 26 newtons of force pushing from the right the object will
A.stay in place
B.move right
C. move left
D. Fall over
Answer:
C. move left
Explanation:
The object will move towards the left direction due to the unbalanced forces that are acting on it.
The resultant force on the object will be 1N in the left direction
The resultant force on a body is that singular force that will have the same effect as the different forces that acts on a bodyWhen forces acts in opposite directions, they are subtractedThe object will move in the direction of the one with the greater forceSo;
Resultant force = 26N - 25N = 1N
The body moves 1N to the left
2KCI -> K + CI2
balanced or unbalanced pls help
Answer:
unbalanced I know you should know to
Please help with this question
Answer:
D
Explanation:
2 substances react making them 1
How many grams of lithium are in 1.25 x 10^26 atoms of Li?
Mass of Lithium = 1443.73 g ≈ 1.4 kg
Further explanationThe mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
The number of atoms of Li = N=1.25 x 10²⁶
mol Li(n) :
[tex]\tt n=\dfrac{N}{No}\\\\n=\dfrac{1.25\times 10^{26}}{6.02\times 10^{23}}\\\\n=2.08\times 10^2[/tex]
mass Li (Ar=6.941 g/mol)
[tex]\tt mass=mol\times Ar\\\\mass=208\times 6,941\\\\mass=1443.73~g[/tex]
How many grams of Cu would be needed to react with 2.0 mol of HNO3?
3 Cu(s) + 8 HNO3(aq) --> 3 Cu(NO3)2(aq) + 2 NO(g) + 4 H20(1)
Answer: B
Explanation: I just took the quiz :)
Taking into account the reaction stoichiometry, 47.655 grams of Cu is required to react with 2 moles of HNO₃.
Reaction stoichiometryIn first place, the balanced reaction is:
3 Cu + 8 HNO₃ → 3 Cu(NO₃)₂ + 2 NO + 4 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Cu: 3 moles HNO₃: 8 moles Cu(NO₃)₂: 3 moles NO: 2 molesH₂O: 4 molesThe molar mass of the compounds is:
Cu: 63.54 g/moleHNO₃: 63 g/moleCu(NO₃)₂: 187.54 g/moleNO: 30 g/moleH₂O: 18 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Cu: 3 moles ×63.54 g/mole= 190.62 gramsHNO₃: 8 moles ×63 g/mole= 504 gramsCu(NO₃)₂: 3 moles ×187.54 g/mole= 562.62 gramsNO: 2 moles ×30 g/mole= 60 gramsH₂O: 4 moles ×18 g/mole= 72 gramsMass of Cu requiredThe following rule of three can be applied: If by reaction stoichiometry 8 moles of HNO₃ react with 190.62 grams of Cu, 2 moles of HNO₃ react with how much mass of Cu?
[tex]mass of Cu=\frac{2 moles of HNO_{3} x190.62 grams of Cu}{8 moles of HNO_{3} }[/tex]
mass of Cu= 47.655 grams
Finally, 47.655 grams of Cu is required to react with 2 moles of HNO₃.
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Explain why non-metals tend to be poor conductors using the term electronegativity.
Explanation:
Components that throughout chemical processes appear to acquire electrons to achieve anions are considered non-metals. These were all elements which are electronegative. Those who are – anti conductors of electricity and heat, fragile and disadvantaged.
Give reasons for : The empirical and molecular formulas of methane gas (CH4) are
identical.
Answer:
Because in methane atoms of carbon and hydrogen are present in simplest ratio of 1:4 that can not be simplified further in whole number so its Emperical formula is same as molecular formula.
Explanation: