Answer:
0.258 moles of Oxygen.
Explanation:
Hope this helps! Please let me know if you need more help or think my answer is incorrect. Brainliest would be MUCH appreciated. Have a wonderful day!
A radioactive element has a half-life of six days. What is the approximate decay rate of the element after the first day? 0. 9% 1. 5% 8. 3% 10. 9%.
A radioactive element has a half-life of six days then the approximate decay rate of the element after the first day is 8.3%.
What is the half life time?Half life time is that time during which half of the concentration of reactant will changed into the product.
According to the question:
In 6 days = 50% of the reactant will change into product
In 1 day = 50%/6 of the reactant will change into product
So, in 1 day = 8.3% of the reactant will change into product
Hence option (3) is correct.
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UHHH HELP I STUCK IN THIS ONE
Answer:
I believe it's B oxygen
Explanation:
Answer:
D, carbon dioxide.
Explanation:
In order to survive, animals need oxygen, food, and shelter.
What is responsible for the sharp decrease in ionization energy between the elements with 2 and 3 atomic number? 10 and 11?
Place the following in order of decreasing radius.
Te2- F- O2-
Answer:
Option 2 is correct.
A mixture of hydrochloric acid and lithium hydroxide produces lithium chloride and water. How many moles of water are produced from 3.25 moles of hydrochloric acid?
If a mixture of hydrochloric acid and lithium hydroxide produces lithium chloride and water, 3.25 moles of water are produced from 3.25 moles of hydrochloric acid.
How to calculate number of moles?According to this question, a mixture of hydrochloric acid and lithium hydroxide produces lithium chloride and water. The balanced chemical equation is as follows:
HCl + LiOH = LiCl + H2O
Based on the above equation, 1 mole of HCl produces 1 mole of water.
3.25 moles of HCl will produce 3.25 moles of H2O.
Therefore, a mixture of hydrochloric acid and lithium hydroxide produces lithium chloride and water, 3.25 moles of water are produced from 3.25 moles of hydrochloric acid.
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Can anyone help me on this please.
Mercury(ii) oxide (hgo) decomposes to form mercury (hg) and oxygen (o2). the balanced chemical equation is shown below. 2hgo right arrow. 2hg o2 the molar mass of o2 is 32.00 g/mol. how many moles of hgo are needed to produce 250.0 g of o2? 3.906 moles 7.813 moles 15.63 moles 73.87 moles
Decomposition reaction results in the formation of the products by splitting the reactants. Moles of mercury(ii) oxide needed are 15.63 moles.
What are moles?Moles are the ratio of mass and the molar mass of the compound or the molecule.
Moles of oxygen are calculated as:
[tex]\begin{aligned}\rm n &= \rm \dfrac {mass}{molar\; mass}\\\\&= \dfrac{250}{32}\\\\&= 7.8125 \;\rm moles\end{aligned}[/tex]
The balanced chemical reaction can be shown as,
[tex]\rm 2HgO \rightarrow 2Hg + O_{2}[/tex]
From the reaction, it can be said that 1 mole of oxygen requires 2 moles of mercury oxide.
Moles of mercury oxide are calculated as:
[tex]\begin{aligned} \rm n HgO& = (7.8125 \;\rm moles \; O_{2}) \times (\dfrac{2 \;\rm moles\; HgO}{1 \;\rm mole \; O_{2}})\\\\\rm n HgO &= 15.625 \;\rm moles \end{aligned}[/tex]
Therefore, option C. 15.63 moles of mercury (II) oxide is needed.
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why do NaCl and CaCl2 conduct electricity when they are dissolved in water or when they are in the molten form, but not in the solid state?
Answer:
The ions differentiate when in molten form.
In solid form, no ions are free to flow like in molten form.
In molten or water form, ions flow through the substance with ease, conducting electricity.
Hope it helps
Be great!
Lithium seems to have dramatic effects on the nervous system, yet our bodies seemingly never evolved to use lithium endogenously, rather focusing on sodium, potassium, and calcium. what is a plausible explanation for this?
Given its small size and high polarizing power, lithium is only involved in covalent rather than ionic bonds in the body as does sodium, potassium, and calcium.
What is lithium?Lithium is a metal and a member of group 1 in the periodic table. It is a very small ion hence it has a different chemistry from the rest of the members of the group.
Lithium is not part of any of the biomolecules because given its small size and high polarizing power, it is only involved in covalent rather than ionic bonds in the body as does sodium, potassium, and calcium.
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What element is commonly used to reduce iron oxide?
Answer:
The element that is commonly used to reduce iron oxide would be carbon.
Explanation:
:)
Iron oxide is reduced to a lower oxide or metal by gaseous carbon monoxide or solid carbon.
What is Reduction?Reduction is defined as the chemical reaction which involves addition of hydrogen or removal of oxygen or gain of electrons.
For example,
2Na + H2 → 2NaH (addition of hydrogen)
CuO + H2 → Cu + H2O(removal of oxygen)
Fe3+ + e- → Fe2+ (gain of electron)
Above example of reduction reaction is when oxygen reacts with iron to form rust. In this reaction oxygen is reduced because it accepts electrons from iron, which is oxidized.
Thus, Iron oxide is reduced to a lower oxide or metal by gaseous carbon monoxide or solid carbon.
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calculate the number of mole and molecule in 10g water
Answer:
1 mole of water weighs 18g. 10/18 moles = 10/18 * 6 * 10^23 number of molecules = 3.33 * 10^23 molecules of water. Each molecule of water has 3 atoms, so the total number of atoms in 10g of water is 3*3.33*10^23 = 10^24.
Explanation:
Answer this question
Answer:
1.312788 atm
Explanation:
PLS ANSWER ME QUICK!!
CaO mass is 25 grams
CO2 volume is 144 liters
CaO + CO2 = CaCO3
what is the mass of CaCO3?
Answer:
100.09 amu is the answer.
Answer:
45g
Explanation:
first we will find out which is the limiting reactant (hope you know how to find it)
Cao is the limiting reactant
so
we will find the number of moles of cao which is 0.45 mol
as according to the equation cao and caco3 have ratios 1:1 so both will have the same no. of moles
then by multiplying 0.45mol by 100 (mr of caco3) we will get the mass of caco3 which is 45g
* look at the photo *
1. saturated solutions of each of the following compounds are made at 20°c. circle the letter(s) of the solution(s), which will form a precipitate upon heating.
a) nacl b) na2so4 c) li2co3 d) sucrose
2. a saturated solution of potassium chloride is prepared in 100.0 g of water at 20°c. if the solution is heated to
50°c, how much more kcl must be added to obtain a saturated solution?
3. a saturated solution of sucrose in 1000.0 g of boiling water is cooled to 20°c. what mass of rock candy will be formed?
The solubility curve can show the variation of solubility with temperature.
What is a saturated solution?A saturated solution is one in which there is just enough solute as it can dissolve at a given temperature. The imege is missing hence the question is incomplete.
The solubility curve shows us the solubility of each substance but unfortunately we do not have it hence we can not answer the questions but we do know that the solubility curve can show the variation of solubility with temperature.
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A students finds a FeNO3 . 3H2O solution with a 1.8 concentration . She uses a a 2 cm wide cuvette in a colorimeter to measure the absorbance. The molar absorptivity of CuSO4 . 5H2O is 42.243 M-1cm-1
What is the Absorbance of the solution?
The absorbance of a solution that has a concentration of 1.8 is 152.75.
How to calculate absorbance?The absorbance of a substance can be calculated using Beer's law equation as follows:
A = εmCl
Where;
A = absorbanceεm = molar absorptivityC = concentration of solutionl = path lengthAccording to this question, the following information are given:
A = ?εm = 42.243 M-1cm-1C = 1.8l = 2cmA = 42.43 × 1.8 × 2
A = 152.75
Therefore, the absorbance of a solution that has a concentration of 1.8 is 152.75.
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if you are a form of an alto cloud, where in the troposphere would you be located? high middle or low
Answer:
These clouds extend through the lower and mid-layers of the troposphere bringing rain to the surface below.
Explanation:
The bases of clouds in the middle level of the troposphere, given the prefix “alto,”
What current (in a) is required to plate out 2. 96 g of nickel from a solution of ni2 in 27. 12 minutes?
The current required to plate out 2.96 g of nickel from the solution of Ni²⁺ in 27.12 minutes is 5.95 A
Balanced equationWe'll begin by writing the balanced equation showing the number of faraday required to plate nickel. This is given below
Ni²⁺ + 2e —> Ni
Molar mass of Ni = 59 g/mol
Mass of Ni from the balanced equation = 1 × 59 = 59 g
Number of faraday = 2 F
1 faraday = 96500 C
2 faraday = 2 × 96500 = 193000 C
SUMMARY
From the balanced equation above,
59 g of Nickel was deposited by 193000 C of electricity
How to determine the quantity of electricityFrom the balanced equation above,
59 g of Nickel was deposited by 193000 C of electricity
Therefore,
2.96 g of Nickel will be deposited by = (2.96 × 193000) / 59 = 9682.71 C of electricity
How to determine the current Quantity of electricity (Q) = 9682.71 CTime (t) = 27.12 mins = 27.12 × 60 = 1627.2 sCurrent (I) =?I = Q / t
I = 9682.71 / 1627.2
I = 5.95 A
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The current required to plate out 2. 96 g of nickel from a solution of ni2 in 27. 12 minutes is 5.95 ampere.
What is current?Current is a charged particle moving through an electrical conductor.
The equation is [tex]\rm Ni^2^+ + 2e = Ni[/tex]
step 1: calculate the mass of Ni
Molar mass of Ni is 59 g/mol
59 × 1 = 59 g
Step2: calculate the number of Faraday
no. of Faraday is 2F
1 Faraday = 96500 C
then, 2 Faraday is equal to 2 × 96500 = 193000 C
Step 3: calculate the quantity of electricity
59 g of Nickel is deposited by, 193000 C of electricity
So, for 2.96 g of nickel
[tex]\dfrac{2. 96\;g \times 193000}{59} = 9682.71 \;C[/tex]
Step4: calculate the current:
Electricity Q = 9682.71 C
Time = [tex]27.12 \times 60 = 1627.2 \;s[/tex]
To find current
[tex]I = \dfrac{Q}{t} \\\\I = \dfrac{9682.71 }{1627.2}\\I = 5.95 A[/tex]
Thus, the current required is 5.95 ampere.
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A compound has a molecular weight of 112. 124 atomic mass units and the empirical formula C3H4O. What is the molecular formula of the compound? Use the periodic table to help you. A. C6H8O B. C9H12O3 C. C8H4O2 D. C4H8O2 E. C6H8O2.
The molecular formula of the compound which has a molecular weight of 112.124 atomic mass units is C₆H₈O₂.
What is molecular formula?Molecular formula of any compound tells about the composition and numbers of each entities present in that molecule.
Steps involved in the prediction of molecular formula:
First we predict the molar mass of given emperical formula as:Molar mass of C₃H₄O = 3(12) + 4(1) + 16 = 56
Now we divide the given mass by the calculated mass of empirical formula:112.124/56 = 2
Now we multiply the subscripts of given empirical formula by this whole number and we get:Molecular formula = (C₃H₄O)₂ = C₆H₈O₂
Hence correct option is (E).
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Draw the structure of the major organic product(s) of the reaction. Grinard's
Answer:
There is drawing of the major organic product of reaction
How are oceans and salt marshes different? B A Salt marshes have deeper water than oceans. Salt marshes have shallower water than oceans. Salt marshes have more organisms than oceans. D . Salt marshes have more wave action than oceans. С
Answer:
Salt marshes have shallower water than oceans
Explanation:
oceans go way deeper then salt marshes with the deepest part of thr ocean at 35,876ft deep
Answer: Salt marshes have shallower water than oceans.
Explanation: oceans are deeper
How many Hydrogen atoms are there in 3NaOH?
Answer:
9 I believe
Explanation:
Which option correctly describes the reactants and products of a chemical reaction?.
Answer:
Chemical reaction occurs when chemical bonds between atoms are formed or broken . The substance that go into a chemical reactions are called reactants, and the substance produced at the end of the reaction are known as the product .
How does the presence of a nucleus provide a method of basic cell classification?
Answer:
Sample Respond: The nucleus maintains the integrity of genes and controls the activities of the cell by regulating gene expression—the nucleus is, therefore, the control center of the cell.
good luck
Explanation:
I got 100 mark as brainiest
Pls help A student studies the effect of an object's height on its amount of gravitational energy. This graph summarizes the data from the study. Which statement best describes what the graph shows? A. As height increases, gravitational energy decreases. B. As height increases, gravitational energy increases. C. As height increases, gravitational energy increases exponentially. D. As height increases, gravitational energy decreases exponentially.
Answer:
B, as height increases gravitational energy increases
Select the example of symbiosis, chosen from the list below that is best described by the statement shown.
Answer:
can you show us the list
Explanation:
Review the map that shows earthquake zones as yellow lines and active volcanoes as red dots. what pattern can you determine about the focation of the volcanoes and the earthquake zones? also explain why the earthquake zones are long lines on the globe. write 3 to 5 sentences.
A map that shows the location of volcanoes is called a Geologic Map. This kind of map contains information about the geological history and condition of volcanic sites.
What do Geologic Maps indicate?
Geologic maps indicate the following:
Note that the map specific to the question is unavailable hence the general response.
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A container with a volume 2. 0 L is filled with a gas at a pressure of 1. 5 atm. By decreasing the volume of the container to 1. 0 L, what is the resulting pressure? Type in your answer using the correct number of significant figures. Remember to use the formula for Boyle's law: P1V1 = P2V2 atm.
The resulting pressure of the gas after decreasing the initial volume from 2 L to 1 L is 3 atm.
What is Boyle's Law?According to the Boyle's Law at constant temperature, pressure of the gas is inversely proportional to the volume of that gas.
For the given question we use the below equation is:
P₁V₁ = P₂V₂, where
P₁ = initial pressure of gas = 1.5 atm
V₁ = initial volume of gas = 2 L
P₂ = final pressure of gas = ?
V₂ = final volume of gas = 1 L
On putting all these values on the above equation, we get
P₂ = (1.5atm)(2L) / (1L) = 3 atm
Hence required pressure of the gas is 3 atm.
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Which two elements will be the most alike and why?
Which two elements will be the most alike and why?
Lithium (Li) and Sodium (Na) because they are both metals and are in the same group
Oxygen (O) and Neon (Ne) because they are both noble gases
Helium (He) and Hydrogen (H) because they are both non-metals and are in the same row.
Explanation:
The first statement is correct
Li &Na
A colloid in which a liquid is dispersed in a solid is called a(n)
Answer:
GEL
Explanation:
A colloid is a type of mixture that consists of insoluble particles in another substance. Liquid dispersed in a colloidal solid is called a gel.
What is gel?A gel is the dispersion of liquid molecules in a solid medium. It is a type of mixture that includes the suspension of particles in another substance. They are colloid that behaves like solid.
The liquid molecules of the medium become thick and viscous in the solid particles and form aggregates of the particles.
Therefore, colloid in which liquid is dispersed in solid is gel.
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How many grams of O2 are made if 2.90 moles of potassium chlorate react based on the same unbalanced equation below
Answer: 139.2 g
Explanation:
2.9 mol KClO3 (3 mol O2 / 2 mol KClO3) (32 g / 1 mol O2) = 139.2 grams :)