Answer:
37.9g of carbon 14 remains
Explanation:
The radioactive decay of an atom follows the equation:
Ln[A] = -kt + Ln[A]₀
Where [A] is amount of isotope after time t, k is decay constant and [A]₀ initial amount of the isotope.
We can find k from half-life using:
k = ln 2 / Half-Life
k = ln 2 / 5730 years
k = 1.2097x10⁻⁴ yrs⁻¹
Replacing in the equation all values:
Ln[A] = -1.2097x10⁻⁴ yrs⁻¹*2292yrs + Ln[50g]
Ln[A] = 3.635
[A] = 37.9g of carbon 14 remains
A gold chain has a volume of 4cm3. The density of gold is 19.3 g/cm3. Calculate the mass of the gold chain. Which one is it ?
-4.8 grams
-23.3 grams
-0.21 grams
-77.2 grams
Rolf prepares four solutions using different solutes as shown in the table below.
Which solution is unsaturated?
Solution A
Solution B
Solution C
Solution D
Answer:
Solution A
Explanation:
Correct on Edge Cumulative Review Exam 2021
Have a blessed day
The unsaturated solution is the one where, the amount solute is lower than the solubility at a specific temperature. Hence, the solution A will form an unsaturated solution.
What is unsaturated solution?Unsaturated solutions are those having the lower concentration of solute than the saturation point of the solvent. Whereas, a saturated solution will completely dissolve the solute in its maximum amount and beyond a point the solute cannot be dissolved.
At a specific temperature gradient, if the dissolved solute is equal to the solvent's saturation point it will form a saturated solution. From the given table it is clear that except solution A all solutions have higher amount of solute than the saturation point.
As the solute concentration is higher, the solvent will try to dissolve maximum amount of the solute. Hence, in solution A have only 20 g of solute added but its saturation point is 37 g/100g. THus, the solution forms an unsaturated solution.
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What kind of boundary is this boundary is the site of recurring earthquake activity and faulting.
Answer:
Transform boundary
Explanation:
The boundary that is a site of recurring earthquake and faulting activities is the transform boundary.
At a transform boundary, there is a significantly high prevalence of earthquakes and faulting.
In this margin, plates slides past one another laterally along a strike - slip direction. This brings about significant shearing and crushing of rocks. It leads to series of earthquakes and faults One notable example is the San Andreas faultHow are science and technology related
There is no answer, science is about empirical knowledge, technology is the sum of techniques, skills, methods, and processes. I do not believe that you will find a answer for that.
Which of the following pairs of compounds will react to form a precipitate? Why?
calcium chloride and silver nitrate
sodium iodide and potassium chloride
calcium chloride and sodium nitrate
Answer:
calcium chloride and silver nitrate
Explanation:
A precipitate is often formed in a double replacement reaction when the reaction yields an insoluble product.
Consider the reaction between calcium chloride and silver nitrate;
CaCl2(aq) + 2AgNO3(aq) -------->2AgCl(s) + Ca(NO3)2(aq)
AgCl is insoluble in water, hence the reaction leads to the formation of a precipitate.
If the boiling point of HCl is -85 (C) and the boiling point of Hl is -36 (C),
what would be a good estimate for the boiling point of HBr? *
PLEASE HELP YOU HAVE TO CLICK THE CORRECT ONES PLEASE IM BEGGING YALL IF I FAIL THIS I FAIL MY GRADE....... Directions: Select each correct image. More than one image may be correct.
The diagrams below show interactions between charged particles. The blue particles are negatively charged, and the red particles
are positively charged.
Which of the diagrams shows a correct interaction between the fields of two charged particles?
Answer:
D
Explanation:
Since the negative particles are going towards the negative section and the positive particles are leaving the positive section. Additionally, opposite charges attract each other and like charges repel each other.
There will be attraction between the opposite charges and repulsion among the like charges. Here the diagram D shows a correct interaction between the fields of two charged particles.
What is a electric field?The electric force acting per unit charge is defined as the electric field. They are generally produced by changing the electric charges or magnetic fields. The electric field strength is expressed in volt per meter (V/m).
E = F/Q
In an electric field it is the electric charge which provides the direction of field. If the charge is negative, then the field is directed towards the charge. A field is directed away from the charge if the charge is negative.
All the electric fields start form a positive charge and end on a negative charge. If two positive charges interact then there will be repulsion between them. But if a positive charge interact with a negative charge then there will be attraction among them.
In diagram D there is an attraction between the opposite charges.
Thus the correct option is D.
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How does a thermometer measure temperature?
Help Determine the number of lead (Pb) atoms that could fit into a 3.0 L container if the density of lead is 11.34 g/cm3
Show work pls
Explanation: You know that the mass of an individual lead atom is equal to
3.4
⋅
10
−
22
grams.
A substance's density tells you what its mass per unit of volume is. In this case, you know that lead has a density of
11.3 g/cm
3
, which means that each
cm
3
of lead will have a mass of
11.3 g
.
Now, your cube has a volume of
2.00 cm
3
, which means that its mass will be equal to
2.00
cm
3
⋅
density
11.3 g
1
cm
3
=
22.6 g
Now all you have to do is look at the mass of one lead atom and figure out exactly how many lead atoms would be needed to make the total mass of the cube equal to
22.6 g
.
22.6
g
⋅
the mass per atom
1 lead atom
3.4
⋅
10
−
22
g
=
6.647
⋅
10
22
lead atoms
Rounded to two sig figs, the number of sig figs you have for the mass of an individual lead atom, the answer will be
no. of lead atoms
=
6.6
⋅
10
22
atoms
You can double-check this result by using lead's molar mass, which tells you what the exact mass of one mole of lead is.
22.6
g
⋅
1 mole Pb
207.2
g
=
0.1091 moles Pb
Now use Avogadro's number to determine how many atoms of lead you have in that many moles
0.1091
moles
⋅
6.022
⋅
10
23
atoms
1
mole
=
6.57
⋅
10
22
atoms
To two sig figs, you will once again get
no. of lead atoms
=
As temperature changes, rocks expand and
contract. The rocks eventually break into
smaller pieces. Which process accounts for
this expansion and contraction of rocks?
Answer:
Thermal heating and cooling
Explanation:
This process described results from thermal heating and cooling as a mechanism of mechanical weathering of rock bodies.
It is often more pronounced in the arid regions of the world where there is a significant difference between day and night temperatures. With mechanical weathering, rocks are broken down into fragments by physical disintegration. During the day, the high temperature causes the rock to expand significantly. At night, the rock contracts and on the long run, joints and fractures begins to appear on the rock surface.help plzzzzzzzzzzzzzzz
Answer:
Blue is the metal Metals react by losing electrons from the outermost shell, which means their outermost electrons and now closer to the nucleus (one shell lower) and thus they get smaller when you go from metal atom to metal ion.
Explanation:
What pressure will be exerted by 25 g of CO2 at temperature of 25°C and a volume of .50 L?
Please, i dont know what the brainliest thing is but ill give it.
Answer:
P = 27.9 atm
Explanation:
Given data:
Mass of CO₂ = 25 g
Temperature = 25°C (25+273.15 K = 298.15 K)
Volume of gas = 0.50 L
Pressure of gas = ?
Solution:
Firs of all we will calculate the number of moles of gas,
Number of moles = mass/molar mass
Number of moles = 25 g/ 44 g/mol
Number of moles = 0.57 mol
Pressure of gas :
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
P × 0.50 L = 0.57 mol × 0.0821 atm.L/ mol.K × 298.15 K
P = 13.95 atm.L/ 0.50 L
P = 27.9 atm
PLEASE ANSWER ASAP ITS TIMED
2Al + Fe ----> Al2O3 +2Fe
For the reaction above, the mole ratio Aluminium to Aluminuim Oxide is
a.1:1
b.2:1
c.1:2
d.2:2
The mole ratio Aluminium to Aluminum Oxide is 2 : 1
Further explanationGiven
Reaction
2Al + Fe ----> Al2O3 +2Fe
Required
The mol ratio
Solution
If we look at the reaction above, there is an element missing from the reactant i.e oxygen, because the number of atoms and elements involved in the reaction should be the same between the reactants and products.
So the possible and balanced reactions are:
2Al(s) + Fe₂O₃ (s) → Al₂O₃ (s)+ 2Fe (s)
From this reaction the ratio of Al: Al₂O₃ can be determined, which is 2: 1
When KOH dissolved in ethanol, what is the intermolecular
attraction between OH ions and C2H5OH molecules?
a. Dipole-dipole
b. ionic attraction
c. London dispersion forces
d. lon-dipole
e. Covalent bonds
Answer: d. Ion-dipole
Explanation:
What do we call a cloud that forms right on the surface of the Earth? *
Answer:
that's ur answer cumulus clouds I hope it helps
What happens when two magnets rappel each other hehe
Answer:
Every magnet has two sides: a north pole and a south pole. We use these names because if you hang a magnet from a thread, the magnet’s north pole points (almost) towards the north direction.
This is because the Earth’s core (its centre) is a large, weak magnet. Your little, strong magnet lines up with Earth’s magnetic core, so it points north. That’s how a magnetic compass works.
Which characteristics describe most nonmetals in the solid phase?
1
They are malleable and have metallic luster.
2
They are malleable and lack metallic luster.
3
They are brittle and have metallic luster.
4
They are brittle and lack metallic luster.
Answer:
4
Explanation:
its a non-metal, dont get confused and pick number 1- it may seem like that’s the answer but remember here we are talking abut the solid phase!
Periodic table is divided into three metals, non metals and metalloids. The non metals are kept on the right side of the periodic table. Th correct option is option D.
What are non metals?Non metals are the element that have property to gain electron. When any element gain electron then element attain negative charge and that element is called anion. The examples of non metals are Oxygen, nitrogen, carbon, Fluorine etc.
The properties of non metals are
Non metals are soft.
Non metals are not malleable that is they can be broken into thin sheets.
Non metals are not ductile they can not be broken into thin wires.
Non metals are brittle in nature that is they can be broken down easily.
Non metals are not lustrous.
Therefore the correct option is option D.
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A mixture of tea,
lemon juice, and
sugar is an example
of what?
Answer:
Explanation:
That in the liquid, the sugar is completely dissolved. Lemon juice, water, and sugar are combined together and form a solution. A solution is a mixture in which the various types of matter are evenly spread out. Water is considered the solvent of lemonade.
What are some properties of an ice cube that tell you it is a solid? Write at least one property, and explain
how it relates to an ice cube.
Answer:
Well ice cubes are normally liquids but it is frozen water making it a solid. Since they are made of water particles, they wouldn't normally be a solid, but the particles are packed close enough together to make it one. Hope this helps! :D
Explanation:
8. An element that has strong intermolecular forces is most likely to have:
•a boiling point below room temperature
•a melting point below room temperature
•a boiling point very close to its melting point
•a very high melting point
Answer:
a very high melting point answer
a base is defined as a compound that produces
What is the answer, and please make it fast.
Describe each layer of Earth’s current atmosphere below:
Answer:
exosphere thermosphere mesosphere stratosphere troposphere
Calculate the amount of heat released when one bottle (250 g) of water is cooled from 25°C to 30°C. The specific heat of water is 4.18 J/g°C.
Answer: the answer is a
Explanation: glad we have the same troubles Rn hahah
Which group/family contains elements with the smallest radius within the same period?
Answer:
Halogens
Explanation:
From the given choices, the halogens will have the smallest radius within the same period.
The size of an atom is estimated by the atomic radius. This is taken as half of the inter-nuclear distance between two covalently bonded atoms of non-metallic elements or half of the distance between two nuclei in the solid state.
Across a period in the periodic table, atomic radii decrease progressively from left to right. Down a group from top to bottom, atomic radii increase progressively due to the addition of successive shells.Since halogen is the right most group from the choices given, it will have the smallest radius.
What do these words mean ?
a) filtrate
b) residue
I will give him or her brilliant and thank you
I need small and right answer.
Answer:
a) filtrate: a liquid which has passed through a filter.
Explanation:
the other one didnt pop up
Differentiate between acids and bases on the basis of their pH values. Give an example of each type. keep it simple
Answer:
differences
Any compound with a pH value between zero to seven is considered acidic, whereas a pH value between seven to fourteen is a base. An acid is called a proton donor, while a base is called a proton acceptor (Kolb, 1978).
examples are:
baking soda is basic (pH = 9.0).
Orange juice is mildly acidic (pH = approximately 3.5)
The environment in your stomach is highly acidic (pH = 1 to 2).
Explanation:
hope that helps.... thanks
Look at mah doggo his name is jasper I have another dog but I cant post two pictures
Answer:
☺
Explanation:
Awwww it's so cute
PLEASE HELPPPPP 12 POINTS
Answer: It most likely represents a canyon.
A solenoid is a coil of wire that produces a magnetic field when carrying an electric current. The strength of the magnetic field
produced by a solenoid can be increased in two basic ways: increasing the number of loops in the solenoid or increasing the
amount of current running through the solenoid. A solenoid's magnetic field can be increased to an even greater degree by wrapping
the wire around a material that can be magnetized. Four solenoids are shown below.
000000000000000
Solenoid A
Copper Wire Only
Current: 6 amps
Solenoid B
Copper Wire Only
Current: 8 amps
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ཤགས་
Solenoid C
Copper Wire + Iron Core
Current: 6 amps
Solenoid D
Copper Wire + Iron Core
Current: 8 amps
Based on the strength of the magnetic fields they produce, arrange the solenoids from strongest to weakest.
Solenoid A
Solenoid B
Solenoid C
Solenoid D
Answer: Motion, providing a burst of power that can move a specific part of the device.
Explanation: Hope this helps
Answer:
D > C > B> A
Explanation:
i solved this on study island