Element X has two natural isotopes. The isotope with a mass of 10.012 amu (10X) has a relative abundance of 19.91%. The isotope with a mass of 11.009 ammu (11X) has a relative abundance of 80.09%. Calculate the atomic mass of this element.
Answers
Answer:
10.81
Explanation:
you can see the answer at the pic
Related Questions
Pedro is baking a cake for his experiment on chemical changes. He knows a chemical change will occur when he puts the cake mixture in the oven. He would like to know what will happen when the cake is removed from the oven. What prediction would you make for Pedro's experiment? A. The chemical changes occurred because the chemicals changed. B. The chemical changes occurred because there was a change in light energy. C. The fruit and the hamburgers were affected by an increase in heat energy. D.The fruit and the hamburgers were affected by a decrease in heat energy.
Answers
Answer:
A. The chemical changes occurred because the chemicals changed.
Explanation:
When baking a cake several chemical reactions occur that change the chemical composition of the ingredients used in baking. An ingredient like baking powder releases carbon dioxide when it undergoes a temperature change in the oven. A chemical change is supposed to change the form of a substance.
An endothermic reaction also occurs when the ingredients absorb heat energy to produce several changes. The firmness of the cake occurs because of the heat absorbed by the proteinous content of the egg.
2. In a well-known movie, Raiders of the Lost Ark, there is a famous scene in which the hero tries to outwit the designers of a trap by replacing a gold statue with a bag of sand of about the same volume.
a) Knowing that the density of gold is 19.3 g/mL and sand is 3.1 g/mL, does this seem like a scientifically reasonable plan? Why or why not?
b) In the movie, the hero grabs the gold statue with one hand and appears to handle it quite easily. Given that the volume of the statue appears to be about 1 L, find the mass of the statue.
Answers
Answer:
I cant answer B, but I can answer A, and I don't think it is a scientifically reasonable plan.
Explanation:
The bag of sand weighs less than the gold statue, and yes the bag of sand seems like it would keep the trap from activating, but you would scientifically have to put something that was the same weight as the gold statue on the pedestal that the statue is on.
At 9°C a gas has a volume of 6.17 L. What is its volume when the gas is at standard temperature?
Answers
Answer:
V₂ = 5.97 L
Explanation:
Given data:
Initial temperature = 9°C (9+273 = 282 K)
Initial volume of gas = 6.17 L
Final volume of gas = ?
Final temperature = standard = 273 K
Solution:
Formula:
The Charles Law will be apply to solve the given problem.
According to this law, 'the volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure'
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
V₁/T₁ = V₂/T₂
V₂ = V₁T₂/T₁
V₂ = 6.17 L × 273K / 282 k
V₂ = 1684.41 L.K / 282 K
V₂ = 5.97 L
how many joules are needed to heat 20.0 g of Au from 10 C to 50 C
Answers
Answer:
Its actually Q = 103.2 J
Explanation:
Question 2 of 10
What are Van der Waals forces?
A. Forces that change polar molecules into nonpolar molecules
B. Very strong forces that exist between two different molecules
O c. Hydrogen bonds in nonpolar molecules caused by a permanent
dipole
D. Small dipole attractions between molecules caused by a
temporary electron shift
SEB
Answers
Answer:
D
Explanation:
Van der Waal forces are small dipole attractions between molecules caused by a temporary electron shift ,here, the option D is correct.
What are Van Der Waal forces?Van der Waals forces exist among all kinds of atoms and molecules. The origin of this force stems from the instantaneous dipole-induced dipole interactions among adjacent polar atoms and molecules.
Among polar molecules, there are three components that contribute to the total forces: the induction force, the orientation force and the dispersion force.
The Van Der Waal forces that act between macroscopic bodies and surfaces in a solvent medium are relevant to the phenomena of protein adsorption.
Van Der Waal forces are the small dipole attractions between molecules caused by a temporary electron shift , thus, option D is correct.
Learn more about Van Der Waal forces here:
https://brainly.com/question/14395915
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Where exactly is an orbital? I understand they are a volume where we expect to find electrons 90% of the time but I don't understand where their shapes are and fit on an atom, and the different forms of orbitals confuse me a little. Can someone explain me where they are with the help of an image? Pardon me if my question isn't very clear
Answers
Answer:
95% of the time (or any other percentage you choose), the electron will be found within a fairly easily defined region of space quite close to the nucleus. Such a region of space is called an orbital. You can think of an orbital as being the region of space in which the electron lives
If an object has a mass of 180 g and a density of 6 g/cm^3, what is the volume of the object?
Answers
Answer:
The answer is 30 cm³Explanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question
mass = 180 g
density = 6 g/cm³
We have
[tex]volume = \frac{180}{6} \\ [/tex]
We have the final answer as
30 cm³Hope this helps you
Why is the nitrogen cycle considered a closed system?
Answers
Answer:
because nitrogen is fixed by bacteria and assimilated by plants
Explanation:
Answer:
It is a considered a closed system because nitrogen is fixed by bacteria and is taken in by plants.
Explanation:
How many electron shells are in period 1
Answers
Answer:
1
Explanation:
The amount of electron shells is the number of the period
Select the measurement with that represents the least amount of pressure.
Select one:
a. 3 atm
b. 3.039 x 1013 Pa
c. 2.280 x 10^3 mm Hg
d. 40 psi
Answers
Answer:
a 3atm
Explanation:
or d 40 psi because it is true and corect [b 3.0398 21oinwex id cn uerfh uh 837hf uxhoec
What is the definition of a transverse wave and what does it look like?
Answers
Answer:
transverse waves, motion in which all points on a wave oscillate along paths at right angles to the direction of the wave's advance.
Gamma
ray
Which has the longest wavelength?
Ultra-
violet Infrared
Radio
Which has the highest frequency?
X-rays Visible
Microwave
WWW
Answers
Answer:
Radio waves
X-rays Visible
Explanation:
The wavelength of a wave is the difference between successive crests on a wave line. Waves with a very high wavelength have low energy.
Frequency is the number of waves that pass a point per unit of time. The higher the frequency, the higher a wave's energy.
From the given spectrum, wavelength increases from left to right. This puts radio waves as the wave with the longest wavelength. It is also right to say, it has the least energy. Also, frequency decrease from left to right. Gamma rays have the highest frequency in the spectrum. This is followed by x-rays.Answer:
Radio waves
X-rays Visible
Explanation:
Oxygen atoms have six outer electrons
Write the symbol for an oxide ion.
Answers
Answer:
[tex]O^{2-}[/tex] is the symbol for an oxide ion
What is the last energy level of N? Mg?
Answers
Answer:
2
3
Explanation:
To infer the last energy of the given atoms, we need to write their electronic configuration:
For N = 1S² 2S² 2P³
Mg = 1S² 2S² 2P⁶ 3S²
The energy levels are usually designated as;
n = 1
n = 2
n = 3
n =4
For N, the last energy level is 2
Mg, the last energy level is 3
We can also determine this number by the periods the atoms can be found.
Which stage of the body's response to stress causes your body to try and restore
a state of balance, however sometimes causing pathological issues?
O Resistance Stage
"Fight or Flight"
"Alarm Stage"
O Recovery State
Answers
You are exploring a dormat volcano. As you walk, you first notice volcanic ash. As you continue in the same direction you find pieces of Lapilli. At the point where you find the lapilli are you closer or further away from the crater? Please answer this im desperate!
Answers
Answer:
you are closer
Explanation:
lapilli is formed from volcanic ash particles, which is something we saw earlier. the particles turn into lapilli when they get moist usually by the magma caused from eruptions
How do minerals differ from ores?
Answers
Ores: metal/coal (iron, gold, coal)
Mineral: not metal, (Granite, limestone,
Identify the chemical formula of ammonia.
Answers
Answer:
The chemical formula for ammonia is NH3
Explanation:
Nitrogen trihydride
The diagram shows a stage in meiosis.
Which stage of meiosis is pictured?
metaphase I
anaphase I
metaphase II
anaphase II
Answers
Answer:
It's not A or D
Explanation:
I was looking all over for answers and I saw A and D, so I used A. It was wrong, so I retook it and used D. Wrong. Your answer is either B or C. I am sorry I couldn't help more.
Answer:
it is b same question was on my quiz
Explanation:
50 POINTS: PLEASE ANSWER AS QUICK AS POSSIBLE!
Question:
After getting their results in, a group of scientists went back and looked at their study. As planned, their experiment consisted of three groups. The first group received a new medicine at a normal dose, the second group received the medicine at half the dose, and the third group received the medicine at twice the dose.
Which of the following best describes what went wrong with the scientists’ study?
Choices:
- an improper experimental procedure
- the lack of a control group
- selection bias
- human error
Answers
Explanation:
The lack of a control group
SiS is what type of mineral?
Answers
These models show the electron structures of two different nonmetal elements. Element 1 at left has a purple circle at center with 2 concentric black lines around it. The first line has 2 small green balls on it. The second line has 8 small green balls on it. Element 2 at right has a purple center with 5 concentric circles around it, with the first circle innermost. The first circle has 2 small green balls on it, and the second circle has 8 small green balls on it. The third circle has 18 small green balls on it, and the fourth circle has 18 small green balls on it. The fifth circle has 6 small green balls on it. Which element is likely more reactive, and why?
Answers
Answer:
Element 2
Explanation:
If we look at the model stated for element 1, it is clear that element 1 must be a noble gas. It has eight electrons in its outermost shell this implies that it has already attained a complete octet of electrons and is reluctant towards chemical reaction.
The second element belongs to group 16 since it has six electrons on its outermost shell. It is certainly more reactive than element 1 which is a noble gas.
Answer: D
Element 2 is more reactive because it does not have a full valence shell, so it will attract electrons.
Explanation: Answer on Edgenuity
Please he with c
Please I swear I am crying
Answers
Step 2: 12 - 6 = 6
Therefore the number of neutrons is 6
Because the number of neutrons is equal to the difference between the mass number of the atom and the atomic number
What accounts for the attractions in a chemical bond?
Answers
Answer:
A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. The bond may result from the electrostatic force of attraction between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bonds.
Explanation:
arrangement of small particles in substance is
Answers
Answer:
The particle model represents particles by small, solid spheres.It describes the arrangement, movement and energy of particles in a substance. The model can be used to explain the physical properties of solids, liquids and gases.
Answer:
The particle model represents particles by small, solid spheres. ... It describes the arrangement, movement and energy of particles in a substance. The model can be used to explain the physical properties of solids, liquids and gases.
Explanation:
What is Aerosol,sol and gel
Answers
list in the following elements in order of smallest to largest atomic radius. F, Cl, Br, l
And which has a larger atomic radius?
Answers
I
Explanation:
I >Br >CL >F
The atomic radius in periods from left to right decreases.
What causes the
differences in physical characteristics like hair color among people?
1. diferent versions of genes
2. variations in DNA length
3. different numbers of chromosomes
4. variations in cell nucleus size
Answers
sorry if it’s wrong, but that answer seems reasonable
Answer:
b
Explanation:
i took the test
choose the letter that best describes the behavior of a substance during a phase change:
/A/ neither absorbs or releases energy
/B/ always absorbs energy
/C/ always releases energy
/D/ either absorbs or releases energy
Answers
Answer:
/D/ either absorbs or releases energy
Explanation:
During a phase change energy is either absorbed or released.
A phase change is a reversible process which occurs when a substance changes is its state from one form to another.
Phase changes are used to delineate physical changes.
A phase diagram provides a graphic representation of the change. The diagram can be 2 dimensional or 3 dimensional.
4. Fill in the space.
(a) Force is measured in the unit of
(b) A body moves in a circular path due to
(c) A
exerts force on iron, cobalt and nickel.
(d) Every object on the earth has
(e) We are able to write because of
(f) The change in displacement in unit time is
(g) The S.I. unit of velocity is
for
and of acceleration is
Answers
Answer:
N
Some sort of pulling force to the center
Magnet
Mass
Gravity
Velocity
m/s and m/s^2
Explanation: