Answer:
efflorescence is the migration of a salt to the surface of a porous material, where it forms a coating.
Answer: Efflorescence is a crystalline or powdery deposit of salts often visible on the surface of concrete, brick, stucco, or natural stone surfaces. It occurs when water leaves behind salt deposits on the masonry surface.
Explanation: NO EXPLANTATION SORRY!
You have 0.00891 g of platinum. What is this in micrograms?
A. 8.91 ug
B. 8910 ug
C. 8.91 x 10-6 ug
D. 8.91 x 10-9 ug
Answer:
Hope it help you
Stayhomestaysafe
Plz mark my answer brainliest✍️✍️
Explanation:
It would be 8910 ug
REAL NAME - SHRESTH DUBEY
Why is graphite used for electrodes?
Answer:
Graphite is an electrical conductor, hence useful in such applications as arc lamp electrodes. It can conduct electricity due to the vast electron delocalization within the carbon layers (a phenomenon called aromaticity). These valence electrons are free to move, so are able to conduct electricity.
Explanation:
Graphite is used for electrodes because
The atomic structure of graphite results in a large number of electrons not being bonded, allowing them to migrate between the layers of graphite. It is this large number of free electrons (electron delocalization) that give graphite its excellent conductive properties. As well as being a good conductor, graphite is also cheap, robust and easily accessible.
i swear if someone helps me with this I’ll give them the biggest hug lol
Answer:
C
Explanation:
Bc Look at it like this if norm and grav are equal aka the reason why hes not going threw the cement or flying in the air then the app and the fric are equal too or he would slip and fall
HELPPP
The sum of percentage compositions must equal to 100 ±0.1.
True
False
Answer:
True
Explanation:
How many formula units of magnesium hydroxide are found in 10.88 moles?
Answer:
10.88 moles of magnesium hydroxide contain 65.52 ×10²³formula units
Explanation:
Given data:
Number of formula units of magnesium hydroxide = ?
Number of moles = 10.88 mol
Solution:
The given problem will be solve by using Avogadro number.
The number 6.022×10²³ is called Avogadro number.
1 mole contain 6.022×10²³ formula units.
10.88 mol × 6.022×10²³formula units /1 mol
65.52 ×10²³formula units
Thus, 10.88 moles of magnesium hydroxide contain 65.52 ×10²³formula units .
A gram is one million times larger than a microgram but one billion times smaller than a _______________.
Which kind of bond is formed when two atoms share electorons to form a molecule
Answer:
Covalent bond is formed by mutual sharing of electrons between two atoms
Explanation:
This planet has a toxic atmosphere.
O Mercury
O Venus
O Earth
O Mars
the answer is venus.
if a solution is given to you, how will you determine whether it is acid,base or salt
Answer:
If your lab has litmus paper, you can use it to determine your solution's pH. When you place a drop of a solution on the litmus paper, the paper changes color based on the pH of the solution. Once the color changes, you can compare it to the color chart on the paper's package to find the pH.
Explanation:
A solution's pH will be a number between 0 and 14. A solution with a pH of 7 is classified as neutral. If the pH is lower than 7, the solution is acidic. When pH is higher than 7, the solution is basic. These numbers describe the concentration of hydrogen ions in the solution and increase on a negative logarithmic scale.
For example, If Solution A has a pH of 3 and Solution B has a pH of 1, then Solution B has 100 times as many hydrogen ions than A and is therefore 100 times more acidic.
Can somebody plz help answer this question correctly!! (Only 1-2 sentences is good) thanks !!
WILL MARK BRAINLIEST WHOEVER ANSWERS FIRST :DDD
I believe the worst form of pollution is fissile fuels because coal takes millions of years to form and why burn something that takes so long to make.
What is the name of this molecular compound> F6I5 pleasee and thank youuuu!
Answer:
hexaflourine pentaiodide
Explanation:
f = flourine (6 = hexa)
i = iodine (5 = penta) + ide
What angle do parallel lines form when they intersect?
Answer:When two lines are cut by a transversal, the pairs of angles on one side of the transversal and inside the two lines are called the consecutive interior angles . If two parallel lines are cut by a transversal, then the pairs of consecutive interior angles formed are supplementary
Explanation:
i) Mass of CO2 formed = 2.241 g Molar mass of CO2 = Atomic mass of C + 2 (Atomic mass of O) = 12 + 2 (16) g/mol = 44 g/mol Thus, moles of carbon dioxide formed
Answer:
0.05mole
Explanation:
Given parameters:
Mass of Carbon dioxide formed = 2.241g
Molar mass of Carbon dioxide = 44g/mol
Unknown:
Number of moles of carbon dioxide = ?
Solution:
To solve this problem, we use the expression below:
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Now, insert the parameters and solve;
Number of moles = [tex]\frac{2.241}{44}[/tex] = 0.05mole
Which description lists Earth's layers from most superficial to deepest?
Lithosphere, asthenosphere, lower mantle, outer core, inner core
Lithosphere, lower mantle, asthenosphere, outer core, inner core
Asthenosphere, Lithosphere, lower mantle, inner core, outer core
Inner core, outer core, lower mantle, asthenosphere, lithosphere,
Answer:
Lithosphere, asthenosphere , lower mantle
Explanation:
took on edge 2021!
An atom has 24 protons, 22 electrons, and 28 neutrons. What is the MASS # of the atom
The mass of an atom is given by the sum of the number of PROTONS and the number of NEUTRONS since ELETRON'S mass is negligible.
The mass is 24+28 = 52.
Please help. I’m really struggling. No wrong answers please, if you don’t know it please don’t answer, I’m already failing the class.
Answer:
K₅Mn₅O₁₆
Explanation:
From the question given above, the following data were obtained:
Potassium (K) = 27.5 %
Manganese (Mn) = 37.5 %
Oxygen (O) = 35 %
Empirical formula =?
The empirical formula for the compound can be obtained as follow:
K = 27.5 %
Mn = 37.5 %
O = 35 %
Divide by their molar mass
K = 27.5 / 39 = 0.705
Mn = 37.5 / 55 = 0.682
O = 35 / 16 = 2.188
Divide by the smallest
K = 0.705 / 0.682 = 1
Mn = 0.682 / 0.682 = 1
O = 2.188 / 0.682 = 3.2 = 32/10 = 16/5
K = 1
Mn = 1
O = 16/5
Multiply by 5 to express in whole number
K = 1 × 5 = 5
Mn = 1 × 5 = 5
O = 16/5 × 5 =16
Thus, the empirical formula for the compound is K₅Mn₅O₁₆
How many significant figures are there in the measurement 0.0034 Kg?
Answer:
2 significant figures
Explanation:
Your measurement will have 2 significant figures, the two non-zero digits.
I hope this helps you out! :)
Answer:
there are 2 sig figs ( significant figures) which is 34. Zeros are not counted as significant figs in decimals like above
How many electrons are in Na+
Answer:
10
Explanation:
10 ELECTRONS ARE IN
Na+
1. Cars use
to run, then they spit out carbon.
uhm they use gas/fuel to run
!!Please help I will name u brainliest!! this is for 9th grade physical science
Answer:
a. no 2 7 4 6
b. yes
c. no 3 2 6 1
d. no 2 1 2
a. 1 2 2 1
b. 3 1 3 2
c. 1 5 2
d. 1 1 2
Could really use some help with this!!! What are some chemical properties of nickel?
Answer:
Nickel is silvery-white, hard, malleable, and ductile metal.
It is a good conductor of heat and electricity.
It is bivalent, that is it has a valency of two.
The metal dissolves slowly in dilute acids.
Explanation:
Answer:
Atomic number: 28
Atomic mass: 58.71 g.mol
Melting point: 1453°C
Explanation:
I answered based off what i understood lol. I dunno if this is what you meant but here you go ig
what is the density of 80 gram of a substance occupying a volume of 250 c.m cube at 25°C and 1 atmosphere?
Answer:
Density = 0.32g/mL
Explanation:
Density of a substance can be calculated using the formula:
Density (g/mL) = mass (g)/volume (mL)
According to the information provided in this question, mass of the substance = 80grams, volume = 250cm³/mL
Note that, the pressure and temperature are not needed to calculate the density of the substance.
Density = 80/250
Density = 0.32g/mL
if you want brainliest answer this pleaseeee
a bacterium has a length of 5.5 10-6 m but seen through a powerful microscope it appears to be 1.2 10-3 m. what is the magnification of the microscope?
a virtual image is produced by a convex mirror that is 1.60 cm from the mirror. if the magnification is 0.20 how far from the mirror is the object?
Answer:
what are the answer choices
Explanation:
Answer:
3x
Explanation:
explain in complete sentences how a convection current is created
Answer:
Convection currents are caused by the movement of the magma in the mantle.
Explanation:
explain what happens differently to an electron to emit different colors of light
If the boiling point of HCl is -85 (C) and the boiling point of Hl is -36 (C),
what would be a good estimate for the boiling point of HBr? *
Write the balanced chemical equation for the combustion of sodium metal
Answer:
sodium appears as a silvery soft metal that becomes grayish white upon exposure to air
Explanation:
molecular weight 22.989769 g/mol
modify dates 2021 -01-23
create dates 2004-09-16
Which option correctly matches the chemical formula of a compound with its
name?
A. N2O5, nitrogen oxide
B. N204, nitrogen oxide
C. N205, dinitrogen pentoxide
D. N204, dinitrogen pentoxide
SUBT
Answer:
N205 dinitrogen pentoxide
Explanation:
Trust me miss gorl
Answer:
the answer above is correct.....
Explanation:
Which pair of molecules have the same empirical formula?
Answer
A H2O and H604
B NaCrO4 and Na2Cr207
C K408 and K204
DC2H302 and C6H1206
What is the answer, and please make it fast.