Answer:
12 is the length with accuracy and correct degree of precision.
Explanation:
Answer:
12 cm
That's your answer!!
As we move across the periodic table, from potassium, K, to krypton, Kr, we see the following changes. All BUT ONE is
correct
A) Elements change from solids to gases.
B) Elements change from metals to metalloids to nonmetals.
C) Valence electrons increase beginning with one and ending with eight.
D) The charge of ions changes: negative to the left and positive to the right
Answer: D is wrong
Explanation: The charges go from positive in the left to negative to the right.
Which is not a Lewis acid-base reaction?
I believe it would be the last one. It just amplified the acid, which is (2. Al)(2.Cl3)-> Al2Cl6
Hope it helps!
A neutralization reaction, such as between hydrochloric acid and sodium hydroxide, is not considered a Lewis acid-base reaction as it does not involve the transfer of electron pairs.
Explanation:A Lewis acid-base reaction refers to a reaction involving the transfer of an electron pair. The Lewis acid accepts the electron pair, while the Lewis base donates it. An example that does not fit the definition of a Lewis acid-base reaction would be the neutralization reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH), which produces water (H2O) and salt (NaCl). This reaction does not involve the transfer of electron pairs, and hence, is not a Lewis acid-base reaction.
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How do scientists use sonar to study Earth’s oceans?
A to map the ocean floor
B to map ocean currents
C to measure underwater earthquakes
D to measure water density
The solubility constant of MnS is 2.3 ×10−13 at 25°C. What is the concentration of sulfide
ions in a saturated solution of MnS at equilibrium?
[A] + [B] ⇌ [C] + [D]
MnS ⇌ Mg + S
Ksp = [C][D]
Ksp = (Mn)(S)
2.3*10^-13 = (x)(x)
2.3*10^-13 = x^2
x = 4.8*10^-7
Concentration of sulfide is x.
Today, my son asked "Can I have a book, Mark?" and I burst into tears. 11 years old and he still doesn't know my name is Brian.
How do you find the formula for the ionic compound of sodium chromate?
Pls show all working out ty;)
Answer:
Explanation:
Sodium chromate has the chemical formula Na2CrO4, and a molar mass of 161.97 g/mol. It is a salt made of two sodium cations (Na+) and the chromate anion (CrO4-) in which the chromium atom is attached to four oxygen atoms.
Una sustancia que ocupa el volumen de 70mL y una masa de 165g
Answer:
The density of the substance is 2.357 g/mL
Explanation:
Given that the substance has a mass of 165 g and occupies a volume of 70 mL, I'm assuming that the question missing is: What is its density?
Density (ρ) is computed as follows:
ρ = mass/volume
ρ = 165 g/ 70 mL
ρ = 2.357 g/mL
2C4H10(g) + 13O2(g) → 8CO2(g) + 10 H2O(g) How many moles of O2 are required to react completely with 5.00 moles C4H10?
Answer:
32.5 moles of oxygen are required.
Explanation:
Given data:
Number of moles of C₄H₁₀ = 5.00 mol
Number of moles of oxygen required = ?
Chemical equation:
2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O
Now we will compare the moles of oxygen with C₄H₁₀ through balanced chemical equation.
C₄H₁₀ : O₂
2 : 13
5.00 : 13/2×5 = 32.5
So when 5 moles of C₄H₁₀ are present 32.5 moles of oxygen are required to react completely.
Answer:
32.5
Explanation:
There is a 30 g sample of Be-11. It has a half-life of about 14 seconds.How much will be left after 28 seconds?A.3.75 gB.7.5 gC.15 gD.30 g
Answer:
After 28 sec 7.5 grams of Be will be left
Explanation:
Given data:
Total amount of Be = 30 g
Half life of Be = 14 sec
Mass left after 28 sec = ?
Solution:
First of all we will calculate the number of half lives in 28 sec.
Number of half lives = T elapsed / half life
Number of half lives = 28 sec / 14 sec
Number of half lives = 2
AT time zero = 30 g
At first half life = 30 g/2 = 15 g
At second half life = 15 g/ 2 = 7.5 g
So after 28 sec 7.5 grams of Be will be left.
A(n) _________________ solution can dissolve more solute at the given temperature. If you add more solute until the solution will dissolve no more at that temperature, it is ________________. *
Answer:
An unsaturated solution can dissolve more solute at the given temperature. If you add more solute until the solution will dissolve no more at that temperature, it is saturated solution.
Explanation:
In unsaturated solution, there is capacity of solution to dissolve more solute inside the solution. In saturated solution, there is no capacity of a solution to dissolve any further solute at a given temperature. This capacity is increased by heating the solution so more solute will be dissolved. This is called supersaturated solution.
Calculate the volume of 817.5g of CH4 at STP.
Answer:
The volume is 1143,78 L
Explanation:
We use the formula PV=nRT. The conditions STP are 1 atm of pressure and 273K of temperature. We calculate the weight of 1 mol of CH4.
Weight 1 mol CH4= weight C+ (weight H)x4= 12 g + 1 g x4= 16 g/mol
16 g----1 mol CH4
817,5g--x=(817,5gx1 mol CH4)/16g= 51, 1 mol CH4
PV=nRT V=(nRT)/P
V= (51,1 mol x 0,082 l atm/K mol x 273 K)/1 atm
V= 1143,78 liters
HELP PLEASE
In two or more complete sentences describe all of the van der Waals forces that exist between molecules of sulfur
dioxide, SO-2
Answer:
Dipole-Dipole attraction
Explanation:
Dipole-dipole attraction is a type of vander waals forces found in the molecules of sulfur dioxide.
Vander waals forces are weak attractions joining non-polar and polar molecules together. They are of two types:
London dispersion forces which are weak attractions found between non-polar molecules.
Dipole-Dipole attraction are the forces of attraction which exists between polar molecules. Such molecules have permanent dipoles. This implies that the positive pole of one molecule attracts the negative pole of another. This is what happens between the oxygen and sulfur molecules.
A 3.0-L gas mixture contains 30.% oxygen and 70.% nitrogen. Use the ideal gas law to determine the number of moles of oxygen at 2.0 atm and 400-K.
Answer:
The number of moles of oxygen gas comes out to be 0.0548 mole
Explanation:
Given volume of gas = V = 3.0 L
The mixture contains 30 % oxygen gas by mole.
Pressure of mixture of gas = P = 2.0 atm
Temperature = T = 400 K
Assuming n be the total number of moles of the mixture of gas.
The ideal gas equation is shown below
[tex]\textrm{PV} = \textrm{nRT} \\2.0 \textrm{ atm}\times 3.0\textrm{ L} = n \times 0.0821 \textrm{ L.atm.mol}^{-1}.K^{-1} \times 400 \textrm{ K} \\n = 0.18270 \textrm{ mole}[/tex]
The mixture contains 30% oxygen gas by mole
[tex]\textrm{ Number of moles of oxygen gas} = \displaystyle \frac{30\times 0.18270 \textrm{ mole}}{100} = 0.0548 \textrm{ mole}[/tex]
Number of moles of oxygen gas is 0.0548 mole
Final answer:
At 2.0 atm and 400 K, there are 0.9 moles of oxygen in the 3.0-L gas mixture that contains 30.% oxygen and 70.% nitrogen, as determined using the ideal gas law.
Explanation:
To calculate the number of moles of oxygen, we first need to find the total number of moles in the mixture using the ideal gas law:
n = PV / RT
where n is the number of moles, P is the pressure in atmospheres, V is the volume in liters, R is the ideal gas constant (8.31 J/mol·K), and T is the temperature in kelvins.
Substituting our values into this equation, we get:
n = (2.0 atm)(3.0 L) / (8.31 J/mol·K)(400 K) = 0.069 moles total
we need to find the fraction of moles that is oxygen:
x = (mass of oxygen) / (total mass) = (30.%)(0.069 moles total) = 0.021 moles oxygen
we can use this fraction to find the number of moles of oxygen:
n(O₂) = x(n total) = (0.021 moles oxygen) / (total moles) = (0.9 moles oxygen) / (total moles) = 0.9 moles oxygen
Many of the stars we see in the night sky are called blue giants. They put out more energy and burn millions of times brighter than the Sun. Why does the Sun appear much larger and brighter from Earth than blue giant stars?
Answer:
Because it is closer to earth than the other blue giant stars.
Explanation:
The sun is closer to earth than any other big star which means we see it bigger.
The students in the picture below are using a globe and a lamp to model the Sun and the Earth. If the model Earth acts the same as the real Earth, what will happen as the students spin the model?
A. Different parts of the model Earth will have different seasons.
B. All of the model Earth will have daytime at the same time.
C. A new year will start each time the model Earth makes a complete turn.
D. Some parts of the model Earth will have daytime and some will have night.
Answer:
The only one that makes sense IF the model behaves as the Earth is D.
Explanation:
Answer
D. Some parts of the model Earth will have daytime and some will have night.
Explanation:
i got it right~
Classify the following bonds as ionic, polar
covalent, or nonpolar covalent, and explain:
(a) the CaO bond in CaO, (b) the CC bond in C13CCC13,
(c) the CCl bond in C13CCC13,
(d) the SeCl bond
in SeCl2.
Final answer:
The CaO bond in CaO is ionic, the CC bond in C13CCC13 is nonpolar covalent, the CCl bond in C13CCC13 is polar covalent, and the SeCl bond in SeCl2 is polar covalent.
Explanation:
The classification of bonds as ionic, polar covalent, or nonpolar covalent is based on the electronegativity difference between the bonded atoms. The greater the electronegativity difference, the more ionic the bond is.
(a) The CaO bond in CaO is an ionic bond. Calcium (Ca) is a metal and has a low electronegativity, while oxygen (O) is a nonmetal with a high electronegativity. The difference in electronegativity is large, resulting in an ionic bond.
(b) The CC bond in C13CCC13 is a nonpolar covalent bond. Both carbon (C) atoms have the same electronegativity, resulting in a nonpolar bond.
(c) The CCl bond in C13CCC13 is a polar covalent bond. Chlorine (Cl) has a higher electronegativity than carbon (C), resulting in a polar bond.
(d) The SeCl bond in SeCl2 is a polar covalent bond. Selenium (Se) and chlorine (Cl) have different electronegativities, resulting in a polar bond.
What do chemists express the rates of chemical reaction?
Answer:
They represented rate of chemical reactions are the rate of change in concentration of products or reactants in a reaction
Answer:
Rate of a chemical reaction = change in concentration of a reactant or product per unit time.
It can be expressed in two terms:
1) The rate of decrease in concentration of any of the reactants.
2) The rate of increase in the concentration of any of the products.
Explanation:
Rate of reaction is the speed at which reactants are converted into products or the rate at which products are produced from reactants.
How many grams of Ag will be produced from 5.00g of Cu and 1.00g of AgNO3
Answer:
0.635 grams
Explanation:
Equation for the reaction
[tex]Cu + 2 AgNO_3 -----> Ag^{2+} + CuNO_3[/tex]
mass of Cu = 5.00 g
molar mass = 63.5 g/mol
number of moles = [tex]\frac{mass}{molar mss}[/tex]
number of moles of Cu = [tex]\frac{5.00g}{63.5g/mol}[/tex]
number of moles of Cu = 0.0787 moles
To determine the moles of Ag formed; we have:
0.00588 moles of AgNO₃ × [tex]\frac{2 moles of Ag}{2 moles of AgNO_3}[/tex]
= 0.00588 moles of Ag are produced
Molar mass of Ag = 108 g/mol
Then mass of Ag that will be produced = number of moles of Ag × molar mass of Ag
= 0.00588 moles × 108 g/mol
= 0.635 grams of Ag are produced.
Answer:
0.635 g of Ag
Explanation:
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What information can you infer from the Lewis structure diagram shown below? (2 points)
Group of answer choices
Boron has three valence electrons.
Oxygen has three valence electrons.
Boron has one valence electron.
Oxygen has one valence electron.
Answer:
FLVS
Boron has three valence electrons.
Explanation:
I put the one and it was incorrect.
Answer:
Boron has 3 valence electrons
Explanation:
Empirical formula of C6H12O6
Answer:
The empirical formula of glucose is CH2O
Explanation:
The formula for glucose is C6H12O6
To calculate the empirical formula of glucose, we need to know the number of mole of each element present in the compound.
Since the moles have been given in the formula of glucose C6H12O6
There are 6 moles of carbon, 12 moles of hydrogen and 6 moles of oxygen
Since we've known the number of moles already,so we pick the mole with the smallest number and divide through with it
C - 6/6 = 1
H - 12/6 = 2
O - 6/6 = 1
Therefore, the empirical formula of glucose C6H12O6 is CH2O
Is potassium a metal, non metal or metalliod
Answer: Metal
Explanation: Potassium is a soft, silvery-white metal, member of the alkali group of the periodic chart. Potassium is silvery when first cut but it oxidizes rapidly in air and tarnishes within minutes, so it is generally stored under oil or grease.
Potassium is a metal, specifically an alkali metal, identified as part of Group 1 on the periodic table. Metals are characterized as shiny, malleable, ductile, and excellent conductors of heat and electricity.
Explanation:Potassium, denoted by the symbol 'K' on the periodic table, falls into the category of metals. As part of Group 1, it is an alkali metal. Metals are characterized by their shininess, silvery color (in most cases), excellent conductivity of heat and electricity, malleability, and ductility. To classify an element as a metal, nonmetal or metalloid, it's important to examine its location on the periodic table. Generally, metals occupy the left three-fourths of the periodic table while nonmetals are clustered in the upper right-hand corner. Metalloids, or semimetals, have intermediate properties and lie adjacent to the line dividing metals and nonmetals on the right-hand portion of the periodic table.
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can someone please help me with this asap
what is the value of d
The value of "d" is 80°
Explanation:
Cyclic quadrilaterals are the special group of quadrilaterals with all its base lying on the circumference of the circle. In other words, a quadrilateral inscribed in a circle is called a cyclic quadrilateral.
Cyclic quadrilateral are characterised by some special features such as
Sum of opposite angles of a cyclic quadrilateral is always a supplementary angle. If one of the sides of a cyclic quadrilateral is produced, then the exterior angle so formed is always double of the corresponding interior angle.Using the property 1
We find that since the quadrilateral is cyclic, opposite pairs must be supplementary
100° +∠D must be equal to 180°
D=180° -100° =80°
Plzz Someone
SrBr2 + (NH4)2CO3 → SrCO3 + 2 NH4Br
If 2.1993 moles of (NH4)2CO3 are reacted, how many grams of SrCO3 will be produced?
Answer:
324.6g
Explanation:
From this given problem, it is desirable to solve from the known specie to the unknown.
The balanced chemical combination is given as:
SrBr₂ + (NH₄)₂CO₃ → SrCO₃ + 2NH₄Br
Given;
2.1993 mole of (NH₄)₂CO₃ ;
Unknown:
Mass of SrCO₃ produced;
From the balanced equation, we see that;
1 mole of (NH₄)₂CO₃ reacted to produce 1 mole of SrCO₃
2.1993 mole of (NH₄)₂CO₃ will produce 2.1993 mole of SrCO₃
Mass of SrCO₃ produced = number of moles x molar mass of SrCO₃
Molar mass of SrCO₃ = 87.6 + 12 + 3(16) = 147.6g/mol
Mass of SrCO₃ = 2.1993 x 147.6 = 324.6g
2.1993 moles of (NH4)₂CO₃ reacted will produce approximately 324.74 grams of SrCO₃.
The question asks how many grams of SrCO3 will be produced if 2.1993 moles of (NH4)₂CO₃ are reacted according to the chemical equation:
SrBr₂ + (NH4)₂CO₃ → SrCO₃ + 2 NH₄Br
Firstly, it's essential to note that the balanced chemical equation indicates a 1:1 mole ratio between (NH4)₂CO₃ and SrCO₃. Given this ratio, the moles of (NH4)₂CO₃ reacted will equal the moles of SrCO₃ produced. Hence, 2.1993 moles of (NH4)₂CO₃ will produce 2.1993 moles of SrCO3.
The molar mass of SrCO₃ (strontium carbonate) is approximately 147.63 g/mol. To convert moles of SrCO₃ to grams, multiply the moles by the molar mass:
2.1993 moles of SrCO₃ × 147.63 g/mol = 324.74 grams of SrCO₃
Therefore, 2.1993 moles of (NH4)₂CO₃ reacted will produce approximately 324.74 grams of SrCO₃.
Given the following equation: 2 Ca + O2 --> 2 CaO How many moles CaO produced from 4 moles O2?
8 moles of CaO produced from 4 moles O2.
Explanation:
Balanced chemical equation for the reaction:
2 Ca + O2 --> 2 CaO
Data given:
moles of O2 = 4
Moles of CaO =?
From the reaction it is seen that 1 mole of O2 is used in the reaction to produce 2 moles of CaO
hence, 4 moles of O2 will give x moles of CaO
[tex]\frac{2}{1}[/tex] = [tex]\frac{x}{4}[/tex]
x =8
So, 8 moles of CaO will be produced when 4 moles of O2 will be used in the reaction. Since oxygen is the limiting reagent in the reaction.
I’ve been up all night doin chemistry, can someone please give me the answers
1. Compare How do
residual soil and transported
soil differ?
Residual soil and transported soil differ by as follows:
Residual soil stays over its parent rock and transported soil forms from particles from another place.
Explanation:
Soil forms from weathering of rock. When a rocks get weathered it creates small paiticles. That forms different kind of soil. Soil varies in texture, structure, colour, composition and in pH level. Each and every soil type produced from parent rock. Depending upon the character of parent rock soil type is determined like basalt the igneous rock forms black soil.
Residual soil stays over parent rock it does not get off by the activities of natural agents like air, water, wind and glacier. Transported soil comes from hilly area to flat topped ground by transportation through some transporting agents of nature. It is immature soil.
Task Card #1
A science fair volcano bubbles and fizzes.
What is taking place?
À Solid formation
B. Gas formation
C. Color change
Answer:
B. Gas formation
Explanation:
When you combine baking soda and vinegar - which I'm assuming happened to create this reaction - it forms carbon dioxide, a gas.
The bubbling and fizzing in a science fair volcano is a result of gas formation due to the chemical reaction between baking soda and vinegar which produces carbon dioxide gas.
Explanation:When a science fair volcano bubbles and fizzes, a chemical reaction takes place, specifically a gas formation. In a typical science fair volcano, baking soda (a base) and vinegar (an acid) are combined. This results in the formation of carbon dioxide gas which is what causes the 'bubbling' and 'fizzing' effect. It's a common demonstration of how some chemical reactions result in the production of gas. The gas then escapes the liquid in the form of bubbles causing the eruption we see.
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3 Ag2S + 2 Al + 3 H2O --> 6 Ag + Al2O3 + 3 H2S
How many grams of H2O are used if 75 grams of Al are used?
Answer: really hard
Explanation: I wish I knew how to help you
What is the wavelength of a wave with a
velocity of 50 m/s and a frequency of 5 Hz?
Answer:
Wavelength is 10m
Explanation:
To solve this problem, we use the formula for wavelength
Wavelength = wave velocity / frequency
Wavelength = 50m/s / 5Hz
= 10m
Answer:
10 m
Explanation:
How many moles of aluminum hydroxide are needed to react with 25 grams of sulfuric acid?
0.16 moles of Aluminum hydroxide are needed to react with 25 grams of sulfuric acid.
Explanation:
In order to find the number of moles we first need to write down the balanced equation as,
[tex]3 H_{2} S O_{4}+2 A l(O H)_{3} \stackrel{\text { yiek }}{\longrightarrow} \mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}+6 \mathrm{H}_{2} \mathrm{O}[/tex]
Now as mentioned above,For 3 moles of sulfuric acid , we need 2 moles of Aluminum hydroxide to balance the equation,
Thus we can balance it as,
[tex]\begin{aligned}25 \mathrm{g} \text { of } \mathrm{H}_{2} \mathrm{SO}_{4} & \times \frac{1 \mathrm{mol} \text { of } \mathrm{H}_{2} \mathrm{SO}_{4}}{98.079 \frac{\mathrm{g}}{\mathrm{mol}}} \times \frac{2 \mathrm{mol} \mathrm{Al}(\mathrm{OH})_{3}}{3 \mathrm{mol} \mathrm{H}_{2} \mathrm{SO}_{4}} \\\\&=0.16 \mathrm{mol} \mathrm{Al}(\mathrm{OH})_{3}\end{aligned}[/tex]
Thus it is now clearly known that 0.16 moles of Aluminum hydroxide are needed to react with 25 grams of sulfuric acid.
once formed how do fossils get back to the surface for us to find them?
Answer:
Explanation:
After fossils are buried, how do they get to the surface to be discovered? That's right, the only way for those sediments to reach the surface is for them to be pushed up during the process of mountain making and then worn away by the forces of erosion.
Fossils form in sedimentary layers or rock layers from specific periods when favorable conditions permit preservation of bones, teeth, and sometimes impressions of the organism. Geological activities, such as erosion and plate tectonics, along with climate change, can eventually bring these fossils back to the surface.
Explanation:Fossils, which provide solid evidence of organisms from the past, are typically found in sedimentary layers located next to bodies of water or in rock layers dating back to periods such as the Permian period. Upon death, an organism's body decomposes, leaving mostly teeth and bones, which under specific conditions can become fossilized through processes involving materials like volcanic ash, limestone, and mineralized groundwater.
Geological activity, such as erosion, weathering surface layers, and plate tectonics can eventually bring these fossils back to the surface. Climate change can also expose fossils, as seen when perennial snow covering Greenland melted to reveal geologic evidence of ancient life. These methods allow us to discover fossils of organisms ranging from bivalves and trilobites to early vertebrate bones.
The study and categorization of these fossils from all over the world allows scientists to determine when these organisms lived relative to each other, creating a fossil record that narrates the story of life's evolution on our planet.
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