Why are isotopes with short half-lives not useful for dating very old rocks?
-because not enough of the parent isotope remains to measure accurately
-because not enough of the daughter product has formed to be detectable
-because neither the parent isotope nor the daughter product will be detectable
-because very old rocks would never have contained these isotopes
Answer:
because not enough of the parent isotope remains to measure accurately. because not enough of the daughter product has formed to be detectable.
Explanation:
Hope it helps
what electrolyte is used in a lead storage battery?
A. hydrochloric acid
B. sulfuric acid
C. lead acetate
D. lead nitrate
Answer:
Hi ,
Answer :
Sulfuric acid
What are balancing equations and explain the conservation of mass?
Matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions.
Matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions
Which environment is BEST for an organism that sleeps during the day and digs holes in the ground for shelter?
A
HELP ASAP 20 OR MORE POINTS!!!!
In Brian Greene's "A Physicist Explains Why Parallel Universes May Exist", what reason does Greene give for why he believes parallel universes may exist?
Question 1 options:
Worm holes make traveling between parallel universes possible.
There are only so many ways matter can arrange itself within that infinite universe.
He has seen a parallel universe himself.
Scientists have already proven the existence of parallel universes.
Answer:
B: There are only so many ways matter can arrange itself within that infinite universe.
The idea of a parallel universe was supported by Brian Greene on the basis that there are only so many ways matter can arrange itself within that infinite universe.
A parallel universeMatter is anything that has mass and occupy space. The universe as we know it is filled with matter. The theory of multiple universe holds that there could be another universe apart from this one that we know.
This theory was supported by Brian Greene on the basis that there are only so many ways matter can arrange itself within that infinite universe.
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Find the density of an object that has a mass of 12.69 grams and a volume of 3.5cm3
Answer:
3.62 g/cm³
Explanation:
density = mass ÷ volume
Therefore, do 12.69 divided by 3.5
What do these elements make:
neodymium, rhenium and sulfur
Answer:
Neodymium makes flints inside of lighters. It also takes away the green color off of glass. Rhenium is added with tungsten and molybdenum which makes filaments for lamps. Sulfur makes sulfuric acid which makes batteries and cleaners and can process ores.
Explanation:
An interesting fact for each element:
Neodymium is known for the atomic symbol Nd and the atomic number 60.
Rhenium is known for the atomic symbol Re and the atomic number 75.
Sulfur is known for the atomic symbol S and the atomic number 16.
I hope the Answer answers your question. I gave you some facts to remember those elements in the periodic table!
Neodymium(III) bromide, NdF3, neodymium(III) chloride, NdCl3, neodymium(III) bromide, NdBr3, and neodymium(III) iodide, NdI3, are the results of its reactions with fluorine, chlorine, bromine, and iodine.
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What is the velocity of a wave with a frequency of 10 Hz and a wavelength of
2 m?
A. 0.2 m/s
B. 20 m/s
C. 5 m/s
D. 8 m/s
SUBMIT
Answer:
B. 20m/s
Explanation:
The wavelength of a wave can be calculated using the formula;
λ = v/f
Where;
λ = wavelength (m)
v = velocity (m/s)
f = frequency (Hz)
According to the information provided in this question; the wave has a wavelength (λ) of 2m and a frequency (f) of 10Hz.
Using λ = v/f
v = λ × f
v = 2 × 10
v = 20m/s.
WILL GIVE BRAINLIEST
Calculate the number of moles of AL2O3 that are produced when 0.25 moles of fe is produced
2AL(s) + 3FeO(s)-----> 3Fe(s)+ Al2O3(s)
How can scientists model the effects of reactant concentration on the speed of a reaction?
A. With a ball-and-stick model
B. With a structural model
C. With a computer model
D. With an atomic model
Answer: it is D
Explanation:
Scientists can model the effects of reactant concentration on the speed of a reaction With an atomic model. Hence, D is correct.
What is an atomic model?Atomic model, in physics, a model used to describe the structure and makeup of an atom. Atomic models have gone through many changes over time, evolving as necessary to fit experimental data. For a more in-depth discussion of the history of atomic models, see atom: development of atomic theory.
Scientists use models to study atoms because atoms are extremely small and can't even be seen. If atoms can't be seen, it's easier to study and predict what atoms will do with a representation of them.
Models are useful tools in learning science which can be used to improve explanations, generate discussion, make predictions, provide visual representations of abstract concepts and generate mental models.
Therefore, Scientists can model the effects of reactant concentration on the speed of a reaction With an atomic model. Hence, D is correct.
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If people had not extracted fossil fuels from Earth to use as energy, would this carbon be "cycling" within the global carbon cycle we have defined today?
Answer: The answer is YES. There would still be recycling of carbon even if it wasn't extracted as fossil fuels for energy use.
Explanation:
Carbon is an element in the periodic table with the atomic number of 12. It has 4 electrons on its outermost shell in the electronic configuration. These are valence electrons which are used to form bonds in a wide range of both organic and inorganic compounds, giving rise to simply molecules like carbondioxide.
CARBON CYCLE is a natural process through which carbon and it's compounds are kept fairly constant through recycling. They are found in fossils fuels such as oil, coal, and natural gas. When these fossil fuels are burnt and used as energy, carbon is released in form of carbondioxide. This is just one of the ways carbon is returned to the atmosphere. Other ways include:
--> respiration of plants and animals
--> decomposition of organic substances
--> action of dilute acids and heat on trioxocarbonates (V) and hydrogen trioxocarbonates (IV).
Carbon is then removed from the atmosphere through:
--> plants in photosynthesis
--> rain water as weak trioxocarbonate (IV) acid.
Therefore, there would still be recycling of carbon even if it wasn't extracted as fossil fuels for energy use because the burning of fossil fuels is not the only way carbon is returned to the atmosphere during carbon cycle.
Which person do you agree with the most?
A Casey: The human population had been fairly constant throughout
Earth's history.
Allayna: Population size is increasing at a significant rate due to
advances in technology, medicine, and sanitation.
© Karl: Population size has been decreasing over time because people
are having fewer children.
Name the Following Binary Ionic Compounds:
a. AgCl
b. ZnO
c. CaBr2
d. SrF2
Explanation:
a.Silver chloride
b.zinc Oxide
c.calcium Bromide
d.strontium difluoride
What U.S. state is directly north of Cuba?
Answer:
Florida
Explanation:
Directly north of Cuba is the rural bar fight of a state, Florida
URGENT PLS I NEED THIS OR I WILL FAIL AND HAVE TO DO SUMMER SCHOOL
Carbon monoxide gas and oxygen gas combine to form carbon dioxide
gas in the following equation:
2CO(g) + O2(g) → 2CO2(g)
The enthalpy value for gaseous carbon monoxide is -110.5, and gaseous
carbon dioxide is -393.5, calculate the enthalpy change (AH) for the
reaction.
Answer:
ΔHr = -566kJ/mol
Explanation:
Based on Hess's law, the ΔH of a reaction is the sum of the ΔH's of products times its coefficient subtracting the ΔH of reactants. For the reaction:
2CO(g) + O2(g) → 2CO2(g)
ΔH is:
ΔHr = 2*ΔH CO2 - (2ΔH CO + ΔH O2)
As ΔH CO2 = -393.5kJ/mol; ΔH CO = -110.5kJ/mol and ΔH O2 = 0kJ/mol
ΔHr = 2*-393.5kJ/mol - (2*-110.5kJ/mol)
ΔHr = -566kJ/molHow many moles of mercury are equivalent to 3.46 x 1023 atoms?
Answer:
3.02 X1023 atoms Ag limol. - - 0.50 1 moles. 6.02241023 atoms.
Gold is classified as what type of element?
1. The total pressure of a gas mixture is 1.05 atm. The mixture contains 55% carbon dioxide, 31% nitrogen, and 14% hydrogen.
What is the partial pressure of the carbon dioxide in the mixture?
Answer:
0.15
Explanation:
The partial pressure of the carbon dioxide in the mixture is equal to 0.58 atm.
What is Dalton's law?Dalton's law can be described as the total pressure of all gases exerted being equal to the sum of the partial pressures of every gas in the mixture of non-reacting gases.
The total pressure of a gas mixture of gases can mathematically be defined as :
P (total) = P₁ + P₂ + P₃ + ......
Given, the total pressure of a gas mixture = Ptotal = 1.05 atm
The fraction of carbon dioxide in the mixture = 55 % = 0.55
The fraction of nitrogen in the mixture = 31 % = 0.31
The partial pressure of carbon dioxide in the mixture can be calculated as:
P(CO₂) = 0.55× P(total)
P(CO₂) = 0.55× 1.05
P(CO₂) = 0.58 atm
Therefore, the partial pressure of the carbon dioxide in the mixture is equal to 0.58 atm.
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360.0 g piece of iron is dropped into 425 mL of water at 24.00 °C. The final temperature of the water was measured as 45.70 °C. Calculate the initial temperature of the metal.
Answer:
T(initial) = 241.4˚C
Explanation:
∑q = q(metal) + q(water) = 0*
Q(metal) = (m∙c∙ΔT)Fe = 360g x 0.444j/g˚C x (45.7˚C – T(initial)) = 159.84j/˚C(45.7˚C – T(initial)) = 7304.69 j – 159.84j/˚C x T(initial)
Q(water) = (m∙c∙ΔT)water = 425g x 4.184j/g˚C x (45.7˚C - 24˚C) = 38,586.94 joules
∑[Q(metal) + Q(water)] = 7304.69j -159.84j/˚C x T(initial) + 38586.94j = 0
=> 159.84 x T(initial)j/˚C = 38586.94j
=> T(initial) = 38586.94j / 159.84j/˚C = 241.4˚C
____________________________________
*Initial equation is from Heat Loss = Heat Gained (Conservation of Energy) That is, Heat lost + (- Heat gained) = 0
=> ∑(heat loss by metal) + (- heat gained by water) = 0
using heat transfer equation with temperature change
=> mcΔT(metal) + (-mcΔT(water) = mcΔT(metal) - (mcΔT(water) = 0
Using the information in the passage, rank the types of galaxies by their ability to form new stars, from most to least activity.
Answer:
The correct answer is number 2. Elliptical, Spiral, Irregular.
Explanation:
Unfortunately, you did not attach the passage. Without the passage, we do not know what its content is.
So we are going to answer this question with our own knowledge.
The types of galaxies by their ability to form new stars, from most to least activity are "Elliptical, Spiral, Irregular."
That is the way astronomers classify galaxies in scientific terms. These scientists consider that the smallest galaxies or dwarf galaxies have approximately 100 million stars. On the other hand, giant galaxies have billions or trillions of stars. That immense is our universe.
Scientists still studying the universe and the galaxies to understand the way galaxies are formed.
Im Stuck on this question for My Science homework
Answer:
it's not clear
Explanation:
.
Low frequency waves are ______apart. *
Need some help on this.
20 pts and brainliest
Water cannot dissolve all substances that are made from ionic bonds. This is probably because
A.
Water needs to be stirred to dissolve all ionic substances
B.
Some ionic bonds are too strong for the attractions of water molecules to pull them apart
C.
Some water molecules are not as strong as others
Water cannot dissolve all substances that are made from ionic bonds probably because some ionic bonds are too strong for the attractions of water molecules to pull them apart.
WATER AS A UNIVERSAL SOLVENT:Water is a unique molecule often referred to as a universal solvent because it can dissolve almost all solutes. Water is capable of dissolving polar substances i.e. substances that have an unequal distribution of positive and negative ions.However, some ionic bonds formed from ions of elements are unable to be dissolved by water and this is probably attributed to the fact that those bonds are too strong to be pulled apart by water molecules.
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Determined from the sum of potential and kinetic energy in a substance
A. Heat
B. Potential energy
C. Thermal energy
D. Total internal energy
E. Kinetic energy
1. When you have 43 grams of sodium, how many grams of NaCl can you produce?
Molar mass is the amount grams that one mole weighs.
Explanation: You need to find the molar mass of NaCl which is the same as the amu on the periodic table in grams. So it is 22.99(Na) + 35.45(Cl) = 58.44
You also know that for every mole of NaCl you have 1 mole of Na because every molecule of NaCl has 1 atom of Na.
Finally, using the periodic table, again, you see that the molar mass of Na is 22.99.
Then using stoichiometry, you can find the grams of sodium.
100(g NaCl) * 1 mol (NaCl)/58.44 g (NaCl) * 1 mol (Na)/ 1 mol (NaCl) * 22.99 (g of Na)/ 1 mol (Na)
which equals 39.339435 g of Na.
If you need to maintain significant figures the answer will be 40.
hope this helps
Which Chemical Reaction is balanced?
Answer:
A
Explanation:
The letter A is the correct answer
what you think would happen if global warming caused a decrease in all clouds
Answer:
Global warming is expected to cause changes in the amount of cloud cover, and the height and thickness of these clouds in the future, shifting the balance between the parasol and blanket effects of clouds. The knock-on effect this will have on temperature is known as cloud feedback
Explanation:
Global warming is expected to cause changes in the amount of cloud cover, and the height and thickness of these clouds in the future, shifting the balance between the parasol and blanket effects of clouds. The knock-on effect this will have on temperature is known as cloud feedback
Element X is a solid at room temperature.
It needs one electron per atom to gain the electronic structure of a noble gas.
It is the least reactive element in its group.
What is the element X?
1.At
2.Cs
3. F
4. Li
Answer:
Element X is Cs or cesium
please help! science 10 acid and bases!
Complete and balance the following neutralization reactions.
(a) H,SOA + NaOH
(b) HNO3 + KOH
(c) HCl + Ca(OH)2
(d) H PO, + Ba(OH)2
() CH,COOH + NaOH
(1) HNO3 + Sr(OH)2
(g) HF + Fe(OH)3
(h) HBr + Sn(OH)4
Answer:
See explanation
Explanation:
Recall that a neutralization reaction is one in which an acid reacts with a base to yield salt and water only. The equation is only balanced when the number of each atom on the reactant side is the same as the number of the same atom on the product side.
Let us now complete and balance each reaction equation;
(a) H2SO4 + 2NaOH --------> Na2SO4 + 2H2O
(b) HNO3 + KOH ---------> KNO3 + H2O
(c) 2HCl + Ca(OH)2 -------> CaCl2 + 2H2O
(d) 2H3PO4 + 3Ba(OH)2 ------> Ba3(PO4)2 + 6H2O
() CH3COOH + NaOH --------> CH3COONa + H2O
(1) 2HNO3 + Sr(OH)2 --------->Sr(NO3)2 + 2H2O
(g) 3HF + Fe(OH)3 ------> FeF3 + 3H2O
(h) 4HBr + Sn(OH)4 --------> SnBr4 + 4H2O