Answer:
69%for the isotope that weighs 62.93 u and
31
%
for the isotope that weighs 64.93 u.
You can approach this problem by using a single equation; let's say the first isotope contributes to the relative atomic mass by a fraction
x
(
x
<
1
). SInce there are only 2 isotopes to consider, the fraction the other isotope contributes with will automatically be
1
−
x
.
Let's set up the equation
x
⋅
62.93
u
+
(
1
−
x
)
⋅
64.93
u
=
63.55
u
Solving this for
x
will produce
64.93
u
−
63.55
u
=
2
x
→
x
=
1.38
2
=
0.69
Multiplying these fractions (0.69 and 1 - 0.69 = 0.31) by 100% percent to get the results as a percentage will give
69
%
for the isotpe that weighs 62.93u and
31
%
for the one that weighs 64.93u.
Answer link
All living things must maintain stable body conditions (homeostasis).
A. True
B. False
Test (Speed, Velocity and Acceleration)
A dog can run as fast as 15 miles per hour for a short distance. If a dog ran at this speed 0.10 of an hour, how far would it run?
Answer:
1.5 miles
Explanation:
Given that,
Speed of dog, v = 15 mph
Time taken by the dog, t = 0.1 h
We need to find the distance travelled by the dog. We know that, distance is the product of speed and time. So,
d=vt
[tex]d=15\times 0.1\\\\d=1.5\ \text{miles}[/tex]
Hence, the dog will cover a distance of 1.5 miles.
10. A sample of an unknown composition was tested in a laboratory. The sample could not be broken down by
physical or chemical means. On the basis of these results, the laboratory reported that the unknown sample was
most likely
A. a compound
B. an element
C. a mixture
Answer:
it would be an element because its an element
Explanation:
Help me please answer this with solution....A piece of granite weighing 250g is heated in a boiling water to 100°C. When a granite is place in a calorimeter containing 400g water, the temperature of the water increases from 20°C to 28.5°C. What is the specific heat of the granite, assuming all the heat is transferred to the water?
The specific heat capacity of the granite is 0.796 J/gºC
We'll begin by calculating the heat absorbed by the water. This can be obtained as follow:
Mass of water (M) = 400 g
Initial temperature of water (T₁) = 20 °C
Final temperature (T₂) = 28.5 °C
Change in temperature (ΔT) = T₂ – T₁ = 28.5 – 20 = 8.5 °C
Specific heat capacity of water (C) = 4.184 J/gºC
Heat absorbed (Q) =?Q = MCΔT
Q = 400 × 4.184 × 8.5
Q = 14225.6 JThus, the heat absorbed by the water is 14225.6 J
Finally, we shall determine the specific heat capacity of the graniteHeat absorbed = Heat released
Heat absorbed = 14225.6 J
Heat released = –14225.6 JMass of granite (M) = 250 g
Initial temperature of granite (T₁) = 100 °C
Final temperature (T₂) = 28.5 °C
Change in temperature (ΔT) = T₂ – T₁ = 28.5 – 100 = –71.5 °C
Specific heat capacity of granite (C) =?Q = MCΔT
–14225.6 = 250 × C × –71.5
–14225.6 = –17875 × C
Divide both side by –17875
C = –14225.6 / –17875
C = 0.796 J/gºCTherefore, the specific heat capacity of the granite is 0.796 J/gºC
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3. Calculate the volume of a of .750 M solution containing 67.0 g of KNO3.
Answer : The volume of solution is 0.884 L
Explanation :
Molarity : It is defined as the number of moles of solute present in one litre of solution.
Formula used :
[tex]Molarity=\frac{\text{Mass of solute}}{\text{Molar mass of solute}\times \text{Volume of solution}}[/tex]
Solute is, [tex]KNO_3[/tex]
Given:
Molarity = 0.750 M
Molar mass of [tex]KNO_3[/tex] = 101 g/mole
Mass of [tex]KNO_3[/tex] = 67.0 g
Now put all the given values in the above formula, we get:
[tex]0.750M=\frac{67.0g}{101g/mole\times \text{Volume of solution}}[/tex]
[tex]\text{Volume of solution}=0.884L[/tex]
Therefore, the volume of solution is 0.884 L
Question 3 (12 points)
The core becomes a
a hot, dense, slowly cooling sphere of carbon.
Оа
red dwarf
Answer:
c
Explanation:
which of the following substance is an element?
A. Air
B. Iron
C. Salt
D. Sugar
Answer:
B. Iron
Explanation:
It is element number 26 on the periodic table.
Answer:
Iron is an element because it is a pure substance, air is a mixture, salt and sugar are compounds.
Q1. Why is Cl2 a nonpolar molecule, but HCl is a polar molecule? Explain your reasoning.
Answer:
\/\/
Explanation:
in CI2 the electron charge is identical on both atoms but on HCI electrons are shared unequally between the chlorine atoms and hydrogen atoms
Which factor is most important to consider when evaluating a journal article about global warming? Is the article long enough? Does the article contain facts or only opinions? Did the author of the article use complex, scientific words? Does the author of the article have a doctorate degree?
Answer:
Does the article contain facts or only opinions
Got it right on edg.
Answer:
B) Does the article contain facts or only opinions?
Explanation:
Question 3 of 8
Which two characteristics are needed to describe a force?
A. Direction
B. Speed
C. Resistance
D. Size
SUBT
Answer:A. Direction
C. Resistance
Explanation:
Forces are due to an interaction of at least two objects. It may change the state of motion of an object. It may change the shape of an object. Forces applied on an object in the same direction add to one another and the resultant is in the same direction.
plz mark brainliest
The is the
variable that
gets measured
Answer:
what? what's the full question?
what does the o in chemistry mean?
Answer:
oxygen
Explanation:
periodic table
Which example describes a use for gemstones?
fabrics
plastics
drill bits
paper clips
I will give Brainlyest
Answer:
drill bits
Explanation:
I don't think that you would use gemstones in anything else.
why is earth often referd as a blue planet ?
A-When viewed from space, the biosphere always looks blue.
B-Most people like blue.
C-The sky is blue.
D-The hydrosphere looks blue and covers three-fourths of the Earth’s surface.
NEED ANSWER ASAP
Answer:
D-The hydrosphere looks blue and covers three-fourths of the Earth’s surface.
Explanation:
A ______________________ is required to cause atoms to bond together or be separated from one another. *
a physical change
b phase change
c radioactive decay
d chemical reaction
Answer:
d chemical reaction..
What do metalloids and non metals have in common
Answer:
Metalloids are brittle like Non-Metals
Explanation:
PLEASE HELP ME
For which of the following reactions is ΔH∘rxn equal to ΔH∘f of the product(s)? You do not need to look up any values to answer this question.
Check all that apply.
H2(g)+12O2(g)→H2O(g)
Li(s)+12F2(g)→LiF(s)
2Li(s)+F2(g)→2LiF(s)
Li(s)+12F2(l)→LiF(s)
2H2(g)+O2(g)→2H2O(g)
H2O2(g)→12O2(g)+H2O(g)
Answer:
Explanation:
Li(s)+1/2 F₂(g)→LiF(s)
In this reaction one mole of product is formed from gaseous state of reactants . So this reaction will represent the reaction for which ΔH∘rxn equals to ΔH∘f .
In other reaction one mole is not produced if we balance the reaction. The reactant must be in gaseous state . ΔH∘f . represents heat of formation . ΔH∘rxn represents heat of reaction .
What do you notice about the relationship between the force strength and the size of the velocity change?
Answer:
fkv SFHHHHHHHHHCB FSSSSZCHJjjjb .SFFHHHHHHHHC
Explanation:
What do you notice about the relationship between the force strength and the size of the velocity change?
Uuuuuuu
(02.03 MC)
An electron moved from a lower energy level to a higher energy level. What most
likely happened during the transition? (5 points)
1) A random amount of light was released.
2) A fixed amount of energy was absorbed.
-
3) A fixed amount of energy was released.
1
4) A random amount of light was absorbed.
An electron moved from a lower energy level to a higher energy level, and during the transition, a random amount of light was released. Option A
What exactly are these electrons?
An electron is a kind of subatomic particle that has a negative charge. It is possible for it to be free (meaning that it is not associated with the nucleus of any atom) or it may be tied to the nucleus of an atom.
Electrons are sub-atomic particles that may be found in each atom of any chemical element and can occupy different energy levels. These electrons are capable of transitioning between different energy levels.
Electrons may transition from a state with a lower energy level, also known as the ground state, to a state with a higher energy level, also known as an excited state. Alternatively, electrons can transition from a state with a higher energy level to a state with a lower energy level.
When an electron goes from a lower energy level to a higher energy level, the atom takes in more energy, but when the electron moves from a higher energy level to a lower energy level, the additional energy is expelled mostly in the form of light.
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The gas cyclobutane, C4H8(g), can be used in welding. When cyclobutane is burned in oxygen, the reaction is: C4H8(g) + 6 O2(g)4 CO2(g) + 4 H2O(g) (a) Using the following data, calculate ΔH° for this reaction. ΔH°f kJ mol-1: C4H8(g) = 27.7 ; CO2(g) = -393.5 ; H2O(g) = -241.8 ΔH° = kJ (b) Calculate the total heat capacity of 4 mol of CO2(g) and 4 mol of H2O(g), using CCO2(g) = 37.1 J K-1 mol-1 and CH2O(g) = 33.6 J K-1 mol-1. C = J K-1 (c) When this reaction is carried out in an open flame, almost all the heat produced in part (a) goes to raise the temperature of the products. Assuming that the reactants are at 25°C, calculate the maximum flame temperature that is attainable in an open flame burning cyclobutane in oxygen. The actual flame temperature would be lower than this because heat is lost to the surroundings. Maximum temperature = °C
Answer:
a
[tex]\Delta H^o _{rxn} = -2568.9 \ kJ [/tex]
b
[tex]H = 350 JK^{-1}[/tex]
c
[tex]T_{max} = 32.4 ^o C[/tex]
Explanation:
From the question we are told that
The reaction of cyclobutane and oxygen is
[tex]C_4H_8_{(g)} + 6 O_2_{(g)} \to 4 CO_2_{(g)} + 4 H_2O_{(g)}[/tex]
ΔH°f (kJ mol-1) : C4H8(g) = 27.7 ; CO2(g) = -393.5 ; H2O(g) = -241.8 ΔH° = kJ
Generally ΔH° for this reaction is mathematically represented as
[tex]\Delta H^o _{rxn} = [[4 * \Delta H^o_f (CO_2_{(g)} ) + 4 * \Delta H^o_f(H_2O_{(g)} ] -[\Delta H^o_f (C_2H_6_{(g)} + 6 * \Delta H^o_f (O_2_{(g)}) ] ][/tex]
=> [tex]\Delta H^o _{rxn} = [[4 * (-393.5) + 4 * (-241.8) ] -[ 27.7 + 6 * 0][/tex]
=> [tex]\Delta H^o _{rxn} = -2568.9 \ kJ [/tex]
Generally the total heat capacity of 4 mol of CO2(g) and 4 mol of H2O(g), using CCO2(g) = 37.1 J K-1 mol-1 and CH2O(g) = 33.6 J K-1 mol-1. C = J K-1 is mathematically represented as
[tex]H = [ 4 * C_{CO_2_{(g)}} + 6* C_{CH_2O_{(g)}}][/tex]
=> [tex]H = [ 4 * 37.1 + 6* 33.6 ][/tex]
=> [tex]H = 350 JK^{-1}[/tex]
From the question the initial temperature of reactant is [tex]T_i = 25^oC[/tex]
Generally the enthalpy change([tex]\Delta H^o _{rxn}[/tex]) of the reaction is mathematically represented as
[tex]|\Delta H^o _{rxn} |= H * (T_{max} -T_i)[/tex]
[tex] 2568.9 = 350 * (T_{max} -25)[/tex]
=> [tex]\frac{2568.9 }{350} = T_{max} - 25[/tex]
=> [tex]T_{max} = 32.4 ^o C[/tex]
A purified protein has a molecular mass of 360 kDa when measured by size exclusion chromatography. When analyzed by gel electrophoresis in the presence of SDS, three bands are observed, with molecular masses of 160, 140, and 60 kDa. When gel electrophoresis is carried out in the presence of SDS and dithiothreitol, three bands are once again observed, with molecular masses of 140, 80, and 60 kDa. What is the subunit composition of the protein?
Answer:
A protein has four subunits whose molecular masses are 140, 80, and 60 kDa.
A disulfide bond links the two 80 kDa subunits (possibly identical).
Explanation:
Given that:
A protein has four subunits whose molecular masses are 140, 80, and 60 kDa.
A disulfide bond links the two 80 kDa subunits (possibly identical).
As a result of SDS and dithiothreitol analysis treatment, the molecular masses can not be 360 in total. They are 280, which implies that they are in short of 80 kDa. This means that there are possibilities that two groups with a molecular mass of 80 kDa which are joined by a disulfide bond.
The presence of SDS and dithiothreitol acts as a reducing agent, and they can break disulfide bonds whose pH is greater than 7, i.e. those in basic condition.
The density of aluminum is 2.7 g/cm3. A metal sample has a mass of 52.0 grams and a volume of 17.1 cubic centimeters. Could the sample be aluminum? EXPLAIN your answer.
Answer:
The given metal sample is not aluminum because its density is 3.0 g/cm³ while density of aluminum is 2.7 g/cm³.
Explanation:
Given data:
Density of aluminum = 2.7 g/cm³
Mass of metal sample = 52.0 g
Volume of metal sample = 17.1 cm³
which sample is that = ?
Solution:
The given problem will be solve through density formula.
d = m/v
d = density
m = mass
v= volume
Now we will put the values in formula.
d = 52.0 g/ 17.1 cm³
d = 3.0 g/cm³
It is given in question the density of aluminum is 2.7 g/cm³. The given metal sample is not aluminum because its density is 3.0 g/cm³.
4. A method in which two or more components of different sizes are sepa-
rated from a mixture on the basis of the difference in their sizes.
Answer: Sieving
Im 100% sure its the answer!
50 mL of 2.2 M HCl is combined with 50 mL of 2.0 M NaOH in a coffee-cup
calorimeter. The temperature of the solution increases 13.4°C. Assume the
calorimeter is a perfect insulator and the mixture has a specific heat capacity identical
to pure water (4.184 wc)
.
Calculate the heat change from the chemical reaction (in units of kJ). (Pay attention to
sign conventions and do not write the units in your typed answer.)
Answer:
-56.1kJ/mol
Explanation:
The reaction between HCl and NaOH is:
NaOH + HCl → NaCl + H₂O + ΔH
Where ΔH is heat change in the reaction.
As the temperature of the solution increases, the heat is released and ΔH < 0
The heat released in the reaction is obtained using coffe-cup calorimeter equation:
Q = C×m×ΔT
Where Q is heat
C is specific heat of the solution (4.184J/g°C)
m is mass of solution: Assuming density = 1g/mL, 100mL of solution = 100g
And ΔT is change in temperature (13.4°C)
Replacing:
Q = C×m×ΔT
Q = -4.184J/g°C×100g×13.4
Q = -5606.6J
Now, in the reaction you have:
Moles HCl:
0.050L * (2.2mol/L) = 0.11 moles
Moles NaOH:
0.050L * (2.0mol/L) = 0.1 moles
That means the moles of reaction are 0.1 moles, and heat change in the chemical reaction is:
5606.6J / 0.1 mol = 56066J =
-56.1kJ/mol
three students measured the volume of water with three different devices they report the volumes
large cylinder 164 ml
small cylinder 39.7 ml
calibrated buret 18.16 ml
if they pour it into a single container what is the volume
Answer:
The total volume of water is 222 ml.
Explanation:
Given that,
Volume of water by different devices are,
First large cylinder =164 ml
Second small cylinder = 39.7 ml
Third calibrated burette = 18.16 ml
We need to calculate the total volume of water
Using given data
volume of total water=volume by large cylinder+volume by small cylinder+volume by calibrated burette
Put the value into the formula
[tex]V_{w}=164+39.7+18.16[/tex]
[tex]V_{w}=221.8\approx 222\ ml[/tex]
Hence, The total volume of water is 222 ml.
What is a faze of matter
Answer:
solider liquid and gas plasma
Explanation:
in physical a state of matter is one of the distant form in which matter can exist four states of matter are observable in everyday life solid liquid and gas and plasma. hope it helps
In physics, a state of matter is one of the distinct forms in which matter can exist. Four states of matter are observable in everyday life: solid, liquid, gas, and plasma.
A 10.0-g sheet of gold with a temperature of 18.0°C is laid flat on a sheet of iron that weighs 20.0 g and has a temperature of 55.6°C. Given that the specific heats of Au and Fe are 0.129 J g-1 0 c-1 and 0.444 J g-1 0 c-1, respectively, what is the final temperature of the combined metals? Assume that no heat is lost to the surroundings. (Hint: The heat gained by the gold must be equal to the heat lost by the iron.)
Answer:
T = 50.83°C
Explanation:
Let the final temperature be T .
heat lost = mass x specific heat x fall in temperature
heat lost by iron = 20 x .444 x ( 55.6 - T )
heat gained by gold = 10 x .129 x ( T- 18 )
heat lost = heat gained
20 x .444 x ( 55.6 - T ) = 10 x .129 x ( T- 18 )
493.73 - 8.88 T = 1.29 T - 23.22
10.17 T = 516.95
T = 50.83°C
The final temperature of the combined metals (gold and iron) is 50.83°C.
Given the following data:
Initial temperature of gold = 18.0°CFinal temperature of iron = 55.6°CMass of gold = 10.0 gMass of iron = 20.0 gSpecific heat capacity of iron = 0.444 J/g°C.Specific heat capacity of gold = 0.129 J/g°C.To find the final temperature of the combined metals (gold and iron):
Heat lost by the iron = Heat gained by the gold.
[tex]Q_{lost} = Q_{gained}\\\\mc\theta = mc\theta\\\\20(0.444)(55.6 - T_f) = 10(0.129)(T_f - 18)\\\\8.88(55.6 - T_f) = 1.29(T_f - 18)\\\\493.728 - 8.88T_f = 1.29T_f - 23.22\\\\8.88T_f + 1.29T_f = 493.728 + 23.22\\\\10.17T_f = 516.948\\\\T_f = \frac{516.948}{10.17}[/tex]
Final temperature = 50.83°C
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write 0.006 in exponential form
[tex]\huge\pink{Answer}[/tex]
0.0006 in scientific notation is 6 × 10-4
Step by step Explanation:All numbers in scientific notation or standard form are written in the form
m × 10n, where m is a number between 1 and 10 ( 1 ≤ |m| < 10 ) and the exponent n is a positive or negative integer.
To convert 0.0006 into scientific notation, follow these steps:
Move the decimal 4 times to right in the number so that the resulting number, m = 6, is greater than or equal to 1 but less than 10
Since we moved the decimal to the right the exponent n is negative
n = -4
Write in the scientific notation form m × 10n
= 6 × 10-4
Therefore,
6 × 10-4 is the scientific notation form of 0.0006 number and 6e-4 is the scientific e-notation form for 0.0006
HOPE IT HELPS ☺️The world map below shows the locations of San Francisco and Dublin which of these statements best explains why Dublin is not cooler than San Francisco although it is over 1600 km further north?
Answer:
Dublin is warmed by ocean currents.
Explanation:
Got it right on test
Answer:
B. Dublin is warmed by ocean currents.
Explanation:
is sugar an element or a compound
Answer:
it is a compound
Explanation: i have it on a test
