Answer:
Radiometric dating, is called radioactive dating, is a technique used to determine the age of materials such as rocks. It is based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.
Explanation:
:)
How many grams of MgBr2 are needed to create 3.0L of a 4.5M aqueous solution of magnesium bromide?
Answer:
2486 g
Explanation:
First we calculate how many moles of MgBr₂ are required to create such a solution, using the definition of molarity and the given volume and concentration:
Molarity = moles / liters4.5 M = moles / 3.0 Lmoles = 4.5 M * 3.0 L = 13.5 molNow we convert 13.5 moles of MgBr₂ into grams, using its molar mass:
13.5 mol * 184.113 g/mol = 2486 gSolar energy converts ___ into either ___ energy or electrical energy.
electromagnetic, thermal
electromagnetic, potential
thermal, nuclear
chemical, thermal
Answer:
Hey mate....
Explanation:
This is ur answer.....
Solar radiation can be converted either into thermal energy (heat) or into electrical energy.Hope it helps!
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i need help!! i need to make it like 3:2
Answer:
use visual studio code and put in this print{3:2}-1
Explanation:
When NH4SCN is added to a solution of Fe3+ ions, the solution changes from yellow to orange. What is the best explanation for this color change?
Answer:
The iron present in the solution is reduced because of the presence of SCN⁻ ions in solution
Explanation:
The clue in this problem is the color of the solution:
A solution of Fe³⁻ is yellow but when the Fe³⁺ is reduced by an oxidant to Fe²⁺ the solution change to orange color.
The SCN⁻ ion is a reducing agent than, in presence of a substance that can be reducted as Fe³⁺ ion will promote the reaction. That means the best explanation is:
The iron present in the solution is reduced because of the presence of SCN⁻ ions in solutionHow do atmospheric updrafts affect clouds?
Answer:
Updrafts characterize a storm's early development, during which warm air rises to the level where condensation begins and precipitation starts to develop. In a mature storm, updrafts are present alongside downdrafts caused by cooling and by falling precipitation.
Hope it helps
Have a great Day : P
Jason took 6 hours to travel 540 km. For the first 140 km, he took 2 hours.
What was his average speed during the first two hours? ___ km/h
How much distance did he cover in the last four hours of his journey? ___ km
What was his average speed for the rest of the journey? ___ km/h
Answer: Average speed for the first two hours was 70 km/hr
Covered 400 km in the last four hours
Average speed for the rest of the journey was 100 km/hr
Explanation: 140 km / 2 hours = 70 km/hr
540 km - 140 km = 400 km remaining for the last four hours
400 km / 4 hours = 100 km/hr for the last four hours
Suppose you have 6 miles of ethanol(C2H6O)to combust.How many moles of oxygen will the combustion use?
Answer: 18 moles of oxygen will be used.
Explanation:
Combustion is a chemical reaction in which a hydrocarbon is oxidized in the presence of oxygen to give carbon dioxide and water.
The balanced chemical reaction for combustion of ethanol is:
[tex]C_2H_6O+3O_2\rightarrow 2CO_2+3H_2O[/tex]
According to stoichiometry :
1 mole of ethanol require = 3 moles of [tex]O_2[/tex]
Thus 6 moles of ethanol will require=[tex]\frac{3}{1}\times 6=18moles[/tex] of [tex]O_2[/tex]
Thus 18 moles of oxygen will be used.
I need help asap its due today!!!!!
Use the dichotomous key to answer the question. Of the following characteristics, which was used to classify insects?
A. presence of a head
B. shape of wings
C. number of wings
D. shape of abdomen
Answer:
B. shape of wings
Explanation:
Insect, (class Insecta or Hexapoda), any member of the largest class of the phylum Arthropoda, which is itself the largest of the animal phyla. Insects have segmented bodies, jointed legs, and external skeletons (exoskeletons).
Higher classification: Hexapoda
A gas has a volume of 240.0mL at 25.0 oC and 0.79 atm. Calculate its volume at STP (1 atm and 0 oC).
Answer:
189.6 mL
Explanation:
As per Boyles law when a gas is kept at a constant temperature and mass in a closed container, the volume and pressure vary inversely.
P1V1= P2V2
Here, P1 = 0.79 atm, V1 = 240 ml, P2= 1 atm
therefore, substituting values in above equation we get
0.79×240 = 1×V2
⇒V2 = 189.6 ml
therefore, its volume at STP (1 atm and 0 oC) = 189.6 ml
What organelle is sac like and stores different materials?
Group of answer choices
endoplasmic reticulum
vacuoles
ribosomes
Golgi Body
Is temperature and pressure directly proportional or inversely proportional?
A. Inversely proportional
B. Directly proportional
Which statement best describes a chemical reaction in which energy is released?
The chemical reaction in which energy is released is referred to as an Exothermic reaction.
What is an Exothermic reaction?This is the type of reaction in which the overall standard enthalpy change is negative.
This is however as a result of the energy being released when a chemical reaction takes place under certain conditions.
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What is the formula for Iron(IV) phosphite
Answer:
The answer is Iron phosphide (Fe2P)
How is my drawing. Rate it on a scale of 1-10
Answer:
I rate it 10/10
Explanation:
I like it. :)
Answer:
I think 8.5 it looks cool
The distance between the Grand Canyon and Mt. Rushmore is approximately 1.147 km. What is this in meters?
Answer:
1147
Explanation:
you multiply the length by 1000
PLEASE HELP ME. REAL ANSWERS ONLY PLZ
Answer:
Please make it full I'm not seeing it
Which of these choices is the best definition of absolute dating?
A. determining the age of a rock layer by studying the fossils present
B. finding the age of an object compared to other objects
C. measuring the age of an object in years using any method
D. determining the amount of a radioactive isotope in an object
Answer:
I think it's A because the sedimentary rock is also involved in finding the fossils to determine their phenotype and their roots.
How much heat is absorbed by a 112.5 g sample of water when it is heated from 12.5 °C to 9°C? (Specific heat capacity of water is 4.184 J/g °C)
Answer:
–1647.45 J
Explanation:
From the question given above, the following data were obtained:
Mass (M) = 112.5 g
Initial temperature (T₁) = 12.5 °C
Final temperature (T₂) = 9°C
Specific heat capacity (C) = 4.184 J/g°C
Heat (Q) absorbed =?
Next, we shall determine the change in temperature. This can be obtained as follow:
Initial temperature (T₁) = 12.5 °C
Final temperature (T₂) = 9°C
Change in temperature (ΔT) =?
ΔT = T₂ – T₁
ΔT = 9 – 12.5
ΔT = –3.5 °C
Finally, we shall determine the heat absorbed. This can be obtained as follow:
Mass (M) = 112.5 g
Change in temperature (ΔT) = –3.5 °C
Specific heat capacity (C) = 4.184 J/g°C
Heat (Q) absorbed =?
Q = MCΔT
Q = 112.5 × 4.184 × –3.5
Q = –1647.45 J
Most of Earth's atmosphere is made up of nitrogen gas. Nitrogen can also
exist as a solid, liquid, or plasma. Four samples of nitrogen are each in a
different state but have the same mass. Which statement about the relative
amounts of thermal energy in the samples is true?
Answer:
it should be B (i did this wrk before)
Explanation:
Alesha, Kayden,Leo and Caroline are lab partners. They completed the lab in which they put a small marshmallow in a closed, see-through container. They then pushed a plunger down to decrease the volume of the container. They observed the marshmallow looking squished and crumpled. For their lab write up, they must identify the relationship between volume, temperature and pressure of a gas to explain what they saw during this experiment. Determine which student is correct from the statements below.
A.
Alesha says the lab showed that when volume is decreased, pressure is increased. The increase in the pressure in the container is what made the marshmallow look squished and crumpled.
B.
Caroline says the lab showed that when volume is increased, pressure is increased. The increase in the pressure in the container is what made the marshmallow look squished and crumpled.
C.
Kayden says lab showed that when volume is decreased, temperature is increased. The increase in the temperature in the container is what made the marshmallow look squished and crumpled.
D.
Leo says the lab showed they increased the temperature of the container by breathing on it and decreased the volume by pushing down the plunger. Both of increasing the temperature and decreasing the volume caused the pressure to decrease and make the marshmallow look squished and crumpled.
In the compound H2O electrons are A.gained B.lost C.transferred or D.shared?
1
What is the mass of 0.328 mol of CO2?
Answer:
use this conversation units to help you hope it helpsHow is stoichiometry used to calculate the amount of product produced?
A. Stoichiometry measures the amount of product obtained.
B. Stoichiometry determines the molar mass of the product.
C. Stoichiometry calculates the grams of the limiting reagent.
D. Stoichiometry relates moles of product.
Answer:
Stoichiometry relates moles of reactant to moles of product
Explanation:
Just took the quiz :)
Answer:
Stoichiometry relates moles of reactant to moles of product.
Explanation: :)
5. DNA tells amina acids how to form ?
Answer:
i dont know bcoz i am not in 10 class
Explanation:
Answer:
The type of RNA that contains the information for making a protein is called messenger RNA .
Explanation:
(mRNA) because it carries the information, or message, from the DNA out of the nucleus into the cytoplasm
What is the empirical formula of a compound that is 7.74% H and 92.26% C? What is the molecular formula if the molar mass is 78.1134 g/mol?
What is the empirical formula of a compound that is 8.68% O, 6.56% H, and 84.75% C? What is the molecular formula if the molar mass is 184.2372 g/mol?
What is the empirical formula of a compound that is 90.51% C and 9.49% H? What is the molecular formula if the molar mass is 106.167 g/mol?
What is the empirical formula and molecular formula for a substance that is 39.72% C, 1.67% H, and 58.61% Cl if the molar mass of the substance is 181.44 g/mol?
What is the empirical formula of a compound that is 47% Pt, 18.84% K, and 34.16% Cl? What is the molecular formula if the molar mass is 415.098 g/mol?
What is the empirical formula of a compound that is 6.35% H, 55.83% Cl, and 37.83% C? What is the molecular formula if the molar mass is 127.0132 g/mol?
Answer:
For all these questions, we want to find the empirical and molecular formulae of various compounds given their percent composition and molar mass. The technique used to answer one of the questions can accordingly be applied to all of them.
Approaching the first question, we treat the percentages of each element as the mass of that element in a 100 g compound (as the percentages add up to 100%). So, our 100 g compound comprises 7.74 g H and 92.26 g C.
Next, we convert these mass quantities into moles. Divide the mass of each element by its molar mass:
7.74 g H/1.00794 g/mol = 7.679 mol H
92.26 g C/12.0107 g/mol = 7.681 mol C.
Then, we look for the molar quantity that's the smallest ("smaller," in this case, since there are only two), and we divide all the molar quantities by the smallest one. Here, it's a very close call, but the number of moles of H is slightly smaller than that of C. So, we divide each molar quantity by the number of moles of H:
7.679 mol H/7.679 mol H = 1
7.681 mol C/7.679 mol H ≈ 1 C/H (the value is actually slightly larger than 1, but we can treat it as 1 for our purposes).
The quotients we calculated represent the subscripts of our compound's empirical formula, which should provide the most simplified whole number ratio of the elements. So the empirical formula of our compound is C₁H₁, or just CH.
Here, it just so happens that we obtained whole number quotients. If we end up with a quotient that isn't a whole number (e.g., 1.5), we would multiply all the quotients by a common number that would give us the most simplified whole number ratio (so, if we had gotten 1 and 1.5, we'd multiply both by 2, and the empirical formula would have subscripts 2 and 3).
To find the molecular formula (the actual formula of our compound), we use the molar mass of the compound, 78.1134 g/mol. The molar mass of our "empirical compound," CH, is 13.0186 g/mol. Since our empirical formula represents the most simplified molar ratio of the elements, the molar masses of our "empirical compound" and the actual compound should be multiples of one another. We divide 78.1134 g/mol by 13.0176 g/mol and obtain 6. The subscripts in our molecular formula are equal to the subscripts in our empirical formula multiplied by 6.
Thus, our molecular formula is C₆H₆.
---
As mentioned before, all the questions here can be answered following the procedure used to answer the first question above. In any case, I've provided the empirical and molecular formulae for the remaining questions below for your reference.
2. Empirical formula: C₁₃H₁₂O; molecular formula: C₁₃H₁₂O
3. Empirical formula: CH; molecular formula: C₈H₈
4. Empirical formula: C₂HCl; molecular formula: C₆H₃Cl₃
5. Empirical formula: Cl₄K₂Pt; molecular formula: Cl₄K₂Pt
6. Empirical formula: C₂H₄Cl; molecular formula: C₄H₈Cl₂
dentify the base in this acid-base reaction:
Upper N a upper O upper H plus upper H upper C l right arrow upper N a upper C l plus upper H subscript 2 upper O.
NaOH
HCl
NaCl
H2O
Answer:
NaOH
Explanation:
Sodium hydroxide is the base in the acid-base reaction as all other acids and sodium chloride is salt and water is neutral.
What is a base?According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.
Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.
They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.
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After years of hard work you finally come up with a new chemical substance that
will revolutionize the world. What are it's properties? What do you call it? *
Zit be gone. a chemical that contains many natural healing plants that very quickly gets rid of zits. :) -weak answer but it's an answer I guess
Which of the following is a unit of volume?
A.
milliliter
B.
pound
C.
gram
D.
centimeter
Answer:
a. milliliter.
Explanation:
I hope this helps
Answer:
milliliter
Explanation:
think liter
Helpppppppppppppppppppppppp
Answer:
C
Explanation:
all of the fish, bacteria, and mammals that live in a lake
hope this helps!
Please help ASAP!! I’m stuck!!
Which statement is true based on the formula?
6CO2 + 6H2O —> C6H12O6
+ 6O2
1. The mass of carbon dioxide plus water is equal to the mass of sugar plus oxygen
2. The mass of carbon dioxide plus water is less than the mass of sugar plus oxygen
3. The mass of carbon dioxide plus water is greater than the mass of sugar plus oxygen
Answer:
The answer of this question is 3