Answer:
1/8
Explanation:
Use logic,
every one hour, half of a radioactive remains
for the first hour, half remains
for the second hour, half of half remains or quarter remains
for the third hour, 1/2 of 1/2 of 1/2 or 1/8 remains
or use this equation
[tex]n = r ({ \frac{1}{2} })^{ \frac{f}{t} } [/tex]
where
n = amount after f time
r = amount of the original isotope
f = time
t = half-life
what volume (in L) of ethane (C2H6) will be required to produce 42.5 L of carbon dioxide in the reaction below?
2C2H6(g)+7O2(g)->4CO2(g)+6H2O(g)
Answer:
21.25
Explanation:
The element oxygen, represented by the symbol O, is classified as
A. a compound.
В. a mixture.
C. a solution.
D. a pure substance.
Please help soon! :))
Can someone help me please :)
1.which electromagnetic wave has the; longest wavelength, lowest speed, highest frequency, and greatest energy ?
2. Which visible light wave has the; longest wavelength, lowest speed, highest frequency, and greatest energy?
(Please Help I would gladly appreciate it 100 points will be given)
Chemistry 1 - Types of Radioactive Decay
Answer:
Explanation:
The reaction expression is given as:
⁴⁰₁₈ Ar → X + ⁰₁B
To solve this problem, we must bear in mind that both mass number and atomic number must be conserved.
So;
For the mass number:
40 = A + 0
A = 40
For atomic number:
18 = Z + 1
Z = 18 - 1 = 17
An atom is identifiable by the atomic number. Since the atomic number of X is 17 then it is Cl, chlorine
URGENT! plz help me T-T
The compound MnO2 could either have a +4 or a +2 oxidation state on the manganese (Mn) atom. Explain how either scenario could occur.
Answer:
See explanation
Explanation:
Manganese is a transition element. All transition elements have incompletely filled d orbitals which ultimately makes them to exhibit a variable oxidation state.
Manganese has electronic configuration of [Ar]4s23d5. This means that two electrons could be lost from the s orbital to yield Mn^2+. Also, two electrons could be lost from both s and d orbitals to yield Mn^4+
A pile of wind blown sand is called a A. Delta B. Groin C. Meander D. Dune
Answer:
I am pretty sure its called a sand dune
Explanation:
An analog and a digital version of an audio signal were copied.
Analog wave
Digital wave
Original
Original
wmin TAILLAMOUNTAIN
Varan TO
Copy
Copy
Which conclusion is supported by the results shown in the table?
A. Digital waves can be copied without damaging the audio signal,
whereas analog waves cannot
B. Both digital and analog waves become damaged during the
copying process
C. Analog waves can be copied without damaging the audio signal,
whereas digital waves cannot
D. Noise is introduced when both digital and analog waves are
copied
Answer:
The answer is A.Digital waves can be copied without damaging the audio signal, whereas analog waves cannot
Explanation:
I took AP EX quiz.
How do you calculate the percent composition of an element in a compound
Answer:
Percent composition is calculated from a molecular formula by dividing the mass of a single element in one mole of a compound by the mass of one mole of the entire compound. This value is presented as a percentage.
Explanation:
1pt Twins raised in different families still exhibit similar mannerisms, indicating that at least some behavior is
O A. genetis
OB. environmental
O C. instinctual
OD. learned
Why do molecules with dipole-dipole force have higher melting and boiling points than molecules
that only exhibit London Dispersion force?
Answer:
Because dipole - dipole force is stronger than london dispersion force
Explanation:
Intermolecular forces determines a wide range of physical properties of matter of which melting point is one of them.
Both london dispersion forces and dipole- dipole forces are vanderwaals force.
But diople - dipole forces exists between polar molecules which are molecules with permanent dipoles.
In london dispersion forces the dipole is temporary
IF YOU COME THEN YOU WILL GET BRAINLIEST HURRY!!!!
Describe how wind, water, ice and gravity move soil through erosion below.
Answer:
It's big brain time
Explanation:
Weathering is the process of breaking rocks into sediment while erosion is the process that wears away this sediment and other materials and moves them from one location to another. Agents of erosion include gravity, glaciers, wind, and water. Erosion only occurs when these agents have enough energy. The moment agents of erosion lose their energy and momentum they deposit their load. This process is known as deposition. The load is what the agent is carrying. As agents of weathering lose their energy, the heavier sediment is dropped. As the energy is lost, gravel, then sand, then silt, and then clay are deposited, due to their respective masses.
Mass movement, sometimes referred to as mass wasting, is what we call the movement of surface material due to gravity, water, wind, and ice. There are five main types of mass movements: falls, creep, flows, slides, and slump.
On the acid side you can find things like.... *
Answer:
jolly ranchers
Explanation: yes
WILL GIVE BRAINLIEST TO PERSON WHO ANSWERS FASTEST AND CORRECT BUT ANY ANSWERS TO JUST GET POINTS WILL GET REPORTED AND DELETED
Which process in the water cycle returns water from the atmosphere back to Earth? *
5 points
A) evaporation
B) precipitation
C) collection
D) ground water
Answer:
B
Explanation:
When water is at the surface of the ground, it evaporates and goes back to the clouds for which causes it to rain therefore returning water back.
The diagram shows a parent hydra with an offsprinly.
Offspring
Which statement best explains why the offspring has no genetic variation
from the parent?
A. It received genes for producing traits different from the parent's.
B. It received a mix of genes from two different parents.
O C. It received genes that are exactly the same as the parent's genes.
O D. It received chromosomes with many different genes.
Answer:
C. It received genes that are exactly the same as the parent's genes
In asexual reproduction in hydra,offspring has no genetic variation from the parent because it received genes that are exactly the same as the parent's genes.
What is asexual reproduction?Asexual reproduction is a type of reproduction where the offsprings are not produced by the combination of genetic material of two individuals which are of different sexes rather they are produced by a single parent.
It is the not the dominant form of reproduction in living beings.Here, the offsprings are identical to their parents as there is no recombination of genetic material.It is observed in both unicellular or multicellular organisms.
There is no fertilization or gamete formation taking place.Types of asexual reproduction include budding, binary fission,fragmentation,etc.
Learn more about asexual reproduction,here:
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How many grams of zinc chloride will be produced from 55. grams of zinc assuming hydrochloric acid is available in excess
Answer:
Mass = 114.5 g
Explanation:
Given data:
Mass of zinc = 55 g
Mass of ZnCl₂ produced = ?
Solution:
Chemical equation:
Zn + 2HCl → ZnCl₂ + H₂
Number of moles of Zn:
Number of moles = mass/molar mass
Molar mass of Zn = 65.4 g/mol
Number of moles = 55 g/ 65.4 g/mol
Number of moles = 0.84 mol
Now we will compare the moles of Zn and zinc chloride,
Zn : ZnCl₂
1 : 1
0.84 : 0.84
Mass of ZnCl₂:
Mass = number of moles × molar mass
Molar mass of ZnCl₂= 136.3 g/mol
Mass = 0.84 mol × 136.3 g/mol
Mass = 114.5 g
If you have 8.5 moles of water (H2O), how many grams of water do you have?
Answer: i think it is 144.16
Explanation:
How would you find the average speed of a marathon runner throughout an entire race? A Divide the total distance the runner travelled by the total time they took to travel that distance B Divide the total time the runner it took the runner to travel that distance by the the total distance they travelled C Multiply the total distance the runner travelled by the total time they took to travel that distance D Multiply the total time the runner it took the runner to travel that distance by the the total distnace they travelled
Answer:
distance divided by time so A
Explanation:
pls help me i dont understand this question
Answer:
Explanation:
I'm not sure, don't hate me if i'm wrong but i think the third one is the answer.
Answer:
The question is asking what does not have anything to do with the bond formation.
How does the number of tin atoms in the sample compare to the number of aluminum atoms in a 20 gram sample of each (Sn:Al)
The number of Al atoms is greater than the number of Sn atoms
Further explanationGiven
20 gram sample of Tin and Aluminum
Required
Number of atoms
Solution
1 mol = 6.02 x 10²³ particles (atoms, molecules, ions)
So the number of atoms of each element is determined by the number of moles. The greater the number of moles the greater the number of atoms
moles Sn-Tin(Ar = 118,71 u)mol = mass : Ar
mol = 20 : 118,71 u
mol = 0.168
moles of Al-Aluminum(Ar=26.9815 u)mol = 20 : 26.9815 u
mol = 0.741
So the number of Al atoms > number of Sn atoms
12. Describe an open system
Answer:
An open system is a system that has external interactions. An open system is contrasted with the concept of an isolated system which exchanges neither energy, matter, nor information with its environment. An open system is also known as a flow system.
help asap plz will give brainliest !!!!!!
Answer:B and A
Explanation:
i think
Here is a model that shows key information about Earth
and the Sun
Direction of
Earth's rotation
Axis
Which statement best explains the pattern of daytime and nighttime on
Earth?
A. The Sun must revolve around Earth once every 24 hours
B. Earth's axis of rotation must tilt back and forth every 12 hours.
C. Earth must complete one rotation on its axis every 24 hours.
D. The Sun's energy must come from a different direction every 12
hours
The statement information about earth and the sun direction of earth's rotation axis best explains the pattern of daytime and night-time on earth is " earth must complete one rotation on its axis every 24 hours".
What is sun?The sun was composed of incredibly hot gases, as well as then it heats as well as illuminates the entire solar system.
What is earth?The earth was referred to as a "one-of-a-kind" planet since that is the only one on the planet with ideal circumstances for life.
Day though night are caused by the Earth's diurnal revolution. From west to east, the earth rotates on its axis for around 24 hours. As a result, the sun appears to rotate from east to west, resulting in sunset and sunrise. except for polar is, which remains stationary in the north polar sky along the earth's axis, all those other stars move from east to west.
Therefore, the correct answer will be C.
To know more about earth and sun.
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Answer:
THE ANSWER IS (C.)
Explanation:
2. Explain how conduction, convection and radiation all contribute to heating the Earth's
surface and atmosphere.
Answer: Conduction, radiation and convection all play a role in moving heat between Earth's surface and the atmosphere. Since air is a poor conductor, most energy transfer by conduction occurs right near Earth's surface. ... During the day, sunlight heats the ground, which in turn heats the air directly above it via conduction.
HOPE THIS HELPS
15.
Copper (II) carbonate dissociate when heated strongly according to the
chemical equation.
Kuprum (II) karbonat terurai apabila di panaskan mengikut persamaan kimia
berikut.
CuCO
CuO + CO2
What is the mass of copper(II)oxide formed when 12.4g of copper(11) carbonate
dissociate completely?
[Relative atomic mass: Cu = 64, 0 = 16, C = 12]
Berapakah jisim kuprum(II)oksida yang terbentuk apabila 12.4g kuprum(11)
karbonat terurai selengkapnya.?
[Jisim atom relatif. Cu = 64, 0 = 16, C = 12]
A
8.0 g
B
16.0 g
C
24.8 g
D
160 g
Apollo 11 made a ______ landing.
Answer:
Apollo 11 made a capsule landing
Explanation:
Answer: i don’t know what type of landing you mean
Explanation:
They did a lunar landing then reentry and then capsule landing.
Carbon dioxide is used by plants for ___?
Answer:
photosynthesis
Explanation:
that's the way plants feed themselves
Answer:
photosynthesis
Explanation:
I hope i helped
What happens when the compound Mgo is formed? (5 points)
Oxygen transfers two electrons to magnesium.
Oxygen receives two electrons from magnesium.
Magnesium forms an ion with -1 charge; oxygen forms an ion with +1 charge.
Magnesium forms an ion with +1 charge; oxygen forms an ion with -1 charge.
Answer:
Oxygen receives two electrons from magnesium.
Explanation:
Hello!
In this case, considering the chemical reaction by which magnesium oxide is produced:
[tex]2Mg+O_2\rightarrow 2MgO[/tex]
In that case, if we show up the oxidation states, we have:
[tex]2Mg^0+O_2\rightarrow 2Mg^{2+}O^{2-}[/tex]
In such a way, since metals, like magnesium, have the capacity to lose electrons, rather than receive them, we infer why it turns out with +2 rather than -2; thus, we the correct answer is "oxygen receives two electrons from magnesium." because it results with -2 in MgO.
Best regards!
Answer:
Oxygen receives two electrons from magnesium.
Explanation:
what is the difference between polar and non-polar
Answer:
Polar molecules occur when there is an electronegativity difference between the bonded atoms. Nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each other out.
Explanation:
Polar molecules occur when there is an electronegativity difference between the bonded atoms. Nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each other out.
The electron domain and molecular geometry of FO2 is?
A.tetrahedral,trigonal planar
B.tetrahedral, bent
C.trigonal pyramidal, linear
D.trigonal pyramidal, seesaw
Answer:
C.
Explanation: