Explanation:
List the known and unknown quantities and plan the problem. Change each percent abundance into decimal form by dividing by 100. Multiply this value by the atomic mass of that isotope. Add together for each isotope to get the average atomic mass.
Answer:
The atomic mass of second isotope is 7.016
Explanation:
Given data:
Average Atomic mass of lithium = 6.941 amu
Atomic mass of first isotope = 6.015 amu
Relative abundance of first isotope = 7.49%
Abundance of second isotope = ?
Atomic mass of other isotope = ?
Solution:
Total abundance = 100%
100 - 7.49 = 92.51%
percentage abundance of second isotope = 92.51%
Now we will calculate the mass if second isotope.
Average atomic mass of lithium = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
6.941 = (6.015×7.49)+(x×92.51) /100
6.941 = 45.05235 + (x92.51) / 100
6.941×100 = 45.05235 + (x92.51)
694.1 - 45.05235 = (x92.51)
649.04765 = x 92.51
x = 485.583 /92.51
x = 7.016
The atomic mass of second isotope is 7.016
____________________________________________________
(Hope this helps can I pls have brainlist (crown)☺️)
activation energy in reaction is used to:
A- Overcome repulsion force between colliding molecules
B- Breaking bonds
C- Merge Valence electrons
D- All of them
Answer:
D — All of them
Explanation:
The activation energy in a reaction is the minimum amount of energy required for a chemical reaction to take place. Since all the options are processes in a chemical reaction, D should be the answer.
LAST ATTEMPT! Covalent compound naming !
S2Cl4 = Disulfur Tetrachloride
C5Br8 = N/A
Cl2O3 = Dichlorine trioxide
H2S3 = Trisulfane
Formula: N4S4 = Trisulfur Tetrafluoride
Formula: CBr4 = Hexanitrogen trisulfide
Formula: SiO2 = Heptasilicon
Carry learning!
Stay safe!
Study hard!
How are all atoms of silver alike, but different from atoms of other elements?
A. All atoms of silver have the same mass.
B. All atoms of silver have the same atomic number,
C. All atoms of silver have the same number of neutrons.
D. All atoms of silver have the same number of subatomic particles.
B. All atoms of silver have the same atomic number but different numbers of neutrons in the nucleus.
What is the pressure exerted by a force of 15.0 N over an area of 0.00372 m^2 ?
Explanation:
Pressure = Force/Area
therefore,
P = 15/0.00372
= 4.03 X10^³N/m²
What is a scientific law?
Answer:
Scientific laws or laws of science are statements, based on repeated experiments or observations, that describe or predict a range of natural phenomena. The term law has diverse usage in many cases across all fields of natural science.
Explanation:
I hope this helps
Answer:
Scientific laws or laws of science are statements, based on repeated experiments or observations, that describe or predict a range of natural phenomena. Scientific law differs from scientific theory. The main difference between a law and a theory is that a theory tries to explain the reasoning behind something that occurs in nature, whereas scientific laws are just descriptive accounts of how something occurs in nature.
1. Before starting, make a prediction: If substances B and C are both in the gas phase and are at the same energy level, which of the two substances will need to have more energy transferred out in order to change to the liquid phase? Substance B or substance C? Explain your answer.
Answer:
Substance C
Explanation:
Substance C would be the answer because Substance C has a lower attraction level. Because of this, it takes more energy to take out of in order to become a liquid.
LAST ATTEMPT! Covalent compound naming ! !!
Answer:
Name the non-metal furthest to the left on the periodic table by its elemental name.
Name the other non-metal by its elemental name and an -ide ending.
Use the prefixes mono-, di-, tri-.... to indicate the number of that element in the molecule.
im prolly wrong
A force of 450 N accelerates a box across a frictionless surface at a rate of 15 m/s2. What is the mass of the box?
30 kg
6,750 kg
6,750 N
30 N
Answer:
30kg
Explanation:
F=ma
Force=mass×acceleration
40=m×15
m=450/15
m=30kg
in a test trial, using 6% extra strength bleach at room temperature, 100.0 mL of oxygen gas was produced in 2.03 seconds. Calculate the average reaction rate for the oxygen gas.
The average reaction rate for oxygen gas is 49.26 mL/s
The average reaction rate of a substance refers to the speed at which a reaction occurs and therefore products are formed. In the reaction presented, oxygen gas is the product.
Moreover, the average reaction rate can be expressed in mL per second or mL/s, and the formula to calculate it is:
Product in mL/seconds
Let's calculate the reaction rate:
100 mL/ 2.03 s = 49.26 mL/sLearn more about oxygen in: https://brainly.com/question/1506082
An earthquake's____
located directly above its_____
Answer:
An earthquake's what happens when two blocks of the earth suddenly slip past one another.
located directly above its The epic Center
Explanation:
Hope this helps you !!Ensure you write the states of the reactants and products.
• phosphoric acid reacts with magnesium hydroxide
what is meaning of coordination bond?
Answer:
Coordinate-bond meaning
A type of covalent bond in which both the shared electrons are contributed by one of the two atoms. ... The definition of a coordinate bond is a chemical bond between two atoms when one of the atoms shares a pair of electrons.
Explanation:
Explanation:
is a covalent bond in the sharing of electron pair equally between two atoms in which each atom contribute an electron.
it is form when atomic orbitals of atoms each containing an unpaired electron overlap to share the pair of electrons.
A team of scientists is working to find the boiling point of a liquid at very low pressure. After three trials, the team has an average
of 12.3°C. An additional trial gives a result of 13.1°C. Which statement is a reasonable conclusion that can be drawn from this
result? (1 point)
O The original average should be thrown out because it could not be confirmed by new results.
O More data should be collected because the first three trials appear to be wrong.
O The original average should be used because it came from three results, not just one.
O More data should be collected to get a more reliable average.
Since it is conventional in science to use an average not just a single result, the original average should be used because it came from three results, not just one.
The boiling point refers to the temperature when the pressure of the fluid equals the atmospheric pressure. Hence, boiling occurs at atmospheric pressure.
In scientific experiments, it is common to conduct experiments more than once and obtain an average value for the measurement. In this case, the original average should be used because it came from three results, not just one.
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need help with this question, anybody ..
-20 points :)
Can someone help? Thank you.
that' the answer i don't need an explanation
Complete the passage about ionic structures using words from the list
Answer:
see below
Explanation:
1- lattice
2- regular
3- positive
4- negative
5- alternate
6- strong
7- bonds
8- giant
what is an adaptive organ of duck
Answer:
The adaptive organ of duck is webbed feet.
Explanation:
Duck's webbed feet are designed like paddles to provide more surface area to help them swim.
the webbed feet
Explanation:
K3PO4(aq)+MgCl2(aq)⟶
Answer:
6KCl(aq) + Mg3(PO4)2(s) ... balanced equation
Explanation:
Calculate the vapor pressure in torr of a solution containng 24.5 g of glycerin (C3H8O3) in 135 mL water at 30.0* C; the vapor pressure of water at this temperature is 31.8 torr. Assume that glycerin dissolves molecularly (does not dissociate).
A student is studying the boiling points of six different liquids and finds results with consistently higher boiling points than what research would suggest. Which option describes a likely cause?
Answer:
Large molecules tend to have greater boiling points because the London dispersion forces are stronger within.
Explanation:
A 0.1 M NaCl solution and a 0.2 M glucose solution are separated by a membrane that is impermeable to these solutes but is permeable to water. What will happen
nothing will happen
if you calculate the water potiential for both solutions
you get 2(0.1)(R)(T) and 1(0.2)(R)(T)
which is the same thing, so its isotonic.
What you see as you look up at the night sky depends on the weather, the time of year, your location, and how dark your surroundings are. The
---
and stars are the celestial objects most people can see in the night sky.
the [moon] and stars are what most people see.
How many ml of a 2.903 M NaOH solution are needed to produce 500.0 ml of a 0.3344M solution?
Answer:
About 57.60 mL.
Explanation:
We can utilize the dilution equation:
[tex]\displaystyle M_1V_1 = M_2V_2[/tex]
Where M are the molarities of the solutions and V are the volumes of the solutions.
We want to determine the volume of a 2.903 M NaOH solution to mix in order to produce 500.0 mL of a 0.3344 M solution.
Substitute and solve for V₁:
[tex]\displaystyle \begin{aligned} (2.903 \text{ M})V_1 & = (0.3344 \text{ M})(500.0 \text{ mL}) \\ \\ V_1 & = 57.60\text{ mL} \end{aligned}[/tex]
In conclusion, 57.60 mL of a 2.903 M NaOH solution is needed.
is H2O polar or non polar?
Answer:
Explanation:
H2O is a polar molecule
Answer:
polar covalent molecule
Explanation:
the unequal sharing of electrons between the atoms and the unsymmetrical shape of the molecule means that water has two pole a positive and a negative.
Which one item of the list below does not describe part of beta decay?
A. The nucleus of the atom is unstable.
B. A neutron turns into a proton.
C. A proton turns into an electron.
D. An electron is ejected from the nucleus.
Answer:
C
Explanation:
When Beta decay happens, the atomic number of an element goes up, and that means there is an extra proton. A is not the answer because unstable atoms cause decay. B is also not correct because this is what happens in Beta decay: a neutron becomes a proton. D is not correct because an electron is actually emitted from the nucleus.
What equipment is generally used to make lyophilized medications suitable for administering to the patient? a) Test tubes or sterile ampules O b) Petri dishes and sterile droppers c) Sterile syringes or graduated cylinders d) Measuring cups and clean, warm water
Chose any ONE state of matter and explain the space of the particles.
Use a drawing to help explain.
Answer:
solid
intermolecular space is very closed to each other and tightly packed
Which one of the following statements about balanced is true? A reaction is balanced by
what is the mass number of an atom that has six protons. six electrons, and eight neutrons?
Mass number is the sum of the total number of nucleons (neutrons + protons) present in the atom.
Mass number = Protons + Neutrons
Mass number = 6 + 8
Mass number = 14
_______
Hope it helps ⚜
To balance a redox reaction, what must be done?
The ion charge on both sides of the equation must equal zero.
Water must be added to both sides of the equation.
The increase and decrease in oxidation numbers must be balanced.
H+ and OH− must be added to opposite sides of the equation.
To balance a redox reaction, the increase and decrease in oxidation numbers must be balanced.
A redox reaction also called an oxidation- reduction reaction is a chemical reaction in which there is simultaneous gain and loss of electrons.
The species that loses electrons gets oxidized while the species that gains electrons gets reduced. This results in a change of oxidation number. The species that gets reduced decreases in oxidation number and the species that gets oxidized increases in oxidation number.
So, to balance a redox reaction, the simultaneous gain and loss of electrons must be balanced.
Thus, to balance a redox reaction, the increase and decrease in oxidation numbers must be balanced.
Learn more about redox reaction here:
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