Answer:
Relative atomic mass = 24.32 amu.
Explanation:
Given data:
Relative atomic mass of Mg = ?
Abundance of Mg-24 = 79.0%
Abundance of Mg-25 = 10.0%
Abundance of Mg-26 = 11.0%
Solution:
Relative atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass) / 100
Relative atomic mass = (79.0×24)+(10.0×25) +(11.0×26) /100
Relative atomic mass = 1896 + 250 + 286 / 100
Relative atomic mass = 2432 / 100
Relative atomic mass = 24.32 amu.
A teacher wants to figure out the amount of a solution that is needed for a titration experiment in a class lab. The class has 15 students, and each experiment needs 50 mL of solution.
If each student will perform the experiment two times, how many mL of solution will the teacher need for the whole class?
375 mL
750 mL
1500 mL
3000 mL
Answer:
Im sure it's 1500 mL
Explanation:
You would have ti multiply by 15 i think
Answer:
It is C) 1500 mL
Explanation:
It is C) 1500 mL
As part of a lab experiment, Tasha drops a metal cube into a beaker of water, as shown in the figure below. heat transfer After energy in the form of heat transfers between the substances, what is the final temperature of the water? Group of answer choices The final temperature is 25 °C because there is more water than metal. The final temperature is 50 °C because the metal warms the water to the temperature of the metal. The final temperature is between 25 °C and 50 °C because most of the thermal energy is lost to the air around the substances. The final temperature is between 25 °C and 50 °C because energy is transferred from the metal to the water.
Answer:
Explanation:ddxc
A scientist measures the heart rates of 30 students from the same class before
and after they run for different amounts of time. The experimental set up is
shown below:
• Group 1 had ten students who ran one lap.
• Group 2 had ten students who did not run at all.
• Group 3 had ten students who ran two laps.
Group 4 had 30 students from another class whose heart rates were
not measured.
Which group is the control in this experiment?
A. Group 1 from this class
B. Group 2 from this class
C. Group 3 from this class
D. Group 4 from another class
The for this question will be d
Why does the human eye see different colors?
Answer:
Light receptors within the eye transmit messages to the brain, which produces the familiar sensations of color. Newton observed that color is not inherent in objects. Rather, the surface of an object reflects some colors and absorbs all the others. We perceive only the reflected colors.
Calculate the percent composition of chlorine in methyl trichloride, CHCl3.
Answer:
Chlorine --> 89%
Explanation:
Step 1) Add each element's amu up to get the total mass of the compound.
12.011+1.008+3(35.453) = 119.378.
Step 2) Divide the total mass of chlorine by the total mass of the compound.
3(35.453) = 106.359
106.359/119.378 = 0.8909430548.
Step 3) Now multiply by 100 to get the percentage.
0.8909430548*100 = 89.09430548%
Step 4) Estimate and submit your answer
89.09430548% estimates to 89%
Convert 3.55 moles Nacl to formula units
Answer:
2.14 x 10²⁴ formula units
Explanation:
Given parameters:
Number of moles of NaCl = 3.55moles
Unknown:
Formula units of NaCl = ?
Solution:
A mole of substance contains the avogadro's number of particles. The number of particles could be protons, atoms, neutrons, formula units etc.
1 mole of substance = 6.02 x 10²³ formula units
3.55 mole of NaCl = 3.55 x 6.02 x 10²³
= 2.14 x 10²⁴ formula units
When baking, the rods in an oven heat up and turn red. This is an example of *
A. an object emitting conduction as its thermal boundary layer is above 0°C.
B. an object emitting radiation as its thermal boundary layer is above 0°C.
C. an object emitting radiation as its temperature is above 0°C.
D. an object emitting conduction as its temperature is above 0°C
Answer:it is convection
A sample of water is heated from 60.0 °C to 75.0°C by the addition of 140 j of
heat. What is the mass of the water?
work too pls !!!
Mass of the water : 2.23 g
Furter explanationHeat
Q = m.c.Δt
m= mass, g
c = heat capacity, for water : 4.18 J/g° C.
ΔT = temperature
Q= 140 J
Δt = 75 - 60 = 15
mass of the water :
[tex]\tt m=\dfrac{Q}{c.\Delta T}=\dfrac{140}{4.18\times 15}=2.23~g[/tex]
If I have 13 protons and 12 electrons what is my charge?
Answer:
The charge would be +1
Explanation:
Protons have a positive charge while electrons have a negative charge. Therefore, it's simple subtraction. In every case, subtract the number of electrons from the number of protons.
13 - 12 = 1
Therefore the charge is +1
Here's one more example:
If the element chromium (Cr) has 24 protons and 28 electrons, what is its charge? Remember that protons have a positive charge and electrons have a negative charge.
24 - 28 = -4
Charge = -4
It would be written as followed when associating charge with a specific element: [tex]Cr^{-4}[/tex]
If an element has a neutral charge, that means the number of protons and neutrons are the same. If you look at the periodic table of elements, all of the elements listed have a neutral charge. The 0 isn't showed in the corner because it isn't necessary.
Bonus Information:
This isn't related to your question, but I've come across confusions when it comes to particles. Remember that protons (+) and electrons (-) are the only particles that have a charge, therefore, as it says in it's name, neutrons are neutral or have no charge. Neutrons do not contribute to charge, but they do contribute to the mass of an atom. So the number of protons added to the number of neutrons equate to the mass of an atom. Electrons have mass, but it's so miniscule and insignificant that it doesn't even contribute to the overall mass of the atom, so don't count those.
Remember:
C = p - e
M = p + n
C = atomic charge, M = atomic mass, p =protons, n = neutrons, e = electrons
I hope this helps!
Words made from letters of the alphabet are similar to molecules made from atoms. Based on what you already know about matter, which statement best explains this comparison?
A. Atoms can make many different molecules, just like letters can make many different words.
B. Molecules must contain many different atoms, just like words must contain many different letters.
C. There are 26 different atoms that are used to form molecules, just like there are 26 different letters that are used to form words.
D. There are no rules for how letters combine to make words, just like there are no rules for how atoms combine to make molecules.
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. The correct option is option A.
What is atom?
Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit. Atoms can make many different molecules, just like letters can make many different words.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.
Therefore, the correct option is option A that is Atoms can make many different molecules, just like letters can make many different words.
To know more about atom, here:
https://brainly.com/question/13518322
#SPJ5
The solute will dissolve quicker if the solute is more?
A. shaken.
B. saturated.
C. cooled.
D. settled.
Answer:
A) Shaken is the correct answer
Explanation:
The other three don't fit in with the solution if you think about it. When you shake something with lemonade crystals (Like a lemonade flavor packet in poured in a water bottle) it dissolves faster when you shake it rather than it sit on the bottom for 15 minutes! :) .
Hope this helps! :)
Answer:
The Person above me is correct
Explanation:
I got it right first try 100%
how many moles are equal to 89.23g of calcium oxide?
mass of calcium oxide equals 89.23 g
molar mass of calcium oxide equals 56 G / Mole
the formula which is used as much of CaO equals molar mass of CaO
now put all of the Given values in this formula, we would get the moles of calcium oxide.
moles of CaO= 88.23g over 56g/mole which would get you 1.593 moles
The speed limit on a certain highway is 80 kilometers per hour. What is this speed in centimeters per second?
The speed : 2222.2 cm/s
Further explanationVelocity has magnitude and direction
Can be formulated :
[tex]\tt \boxed{\bold{v=\dfrac{d}{t}}}[/tex]v= velocity, m/s
d=distance=m
t=time,s
convert from km/h to cm/s :
[tex]\tt =80\dfrac{km}{h}\times \dfrac{10^5~cm}{1~km}\times \dfrac{1~h}{3600~s}\\\\=2222.2~\dfrac{cm}{s}[/tex]
6th grade science I mark as brainliest zoom in if needed
materials that are eroded from one location are always ?
plz help with this.....☺
Answer:
There is this property called CATENATION which is basically the tendency of the atoms to bind to eachother. It is the MOST in the carbon after that silicon.
So the answer should Carbon atoms bond together to form groups of compounds.
Where does the water in air come from?
Answer:
About 90 percent of water in the atmosphere is produced by evaporation from water bodies, while the other 10 percent comes from transpiration from plants. There is always water in the atmosphere.✌️
How many joules are released when 30.0 g of H2O(g) condenses at 100°C and cools to 10°C
Heat released : 79086 J
Further explanationCondenses :
1. phase change (gas - liquid) : heat of vaporization (ΔH vap for water = 2260 J/g)
2. cools from 100 - 10 : (Q=m.cΔT)
1. Q=m.ΔH vap
[tex]\tt Q=30\times 2260=67800~J[/tex]
2. Q=mc.ΔT(c water = 4.18 J/g C)
[tex]\tt Q=30\times 4.18\times (100-10)\\\\Q=11286~J[/tex]
Q tot = 67800 + 11286 = 79086 J
How many neutrons are present in 1 atom of chlorine?
A.
18
B.
32
C.
16
D.
25
Answer:
18
Explanation:
17 protons + 18 neutrons = 35
17 protons + 20 neutrons = 37 particles in the nucleus
Hope this is right
Hope this helps
A 19.0 g piece of metal is heated to 99.0 °C and then placed in 150 mL of water at 21°C. The temperature of the water rose to 23°C. What is the specific heat of the metal?
Answer:
[tex]0.8696\ \text{J/g}^{\circ}\text{C}[/tex]
Explanation:
[tex]m_m[/tex] = Mass of metal = 19 g
[tex]c_m[/tex] = Specific heat of the metal
[tex]\Delta T_m[/tex] = Temperature difference of the metal = [tex]99-23=76^{\circ}\text{C}[/tex]
V = Volume of water = 150 mL = [tex]150\ \text{cm}^3[/tex]
[tex]\rho[/tex] = Density of water = [tex]1\ \text{g/cm}^3[/tex]
[tex]c_w[/tex] = Specific heat of the water = 4.186 J/g°C
[tex]\Delta T_w[/tex] = Temperature difference of the water = [tex]23-21=2^{\circ}\text{C}[/tex]
Mass of water
[tex]m_w= \rho V\\\Rightarrow m_w=1\times 150\\\Rightarrow m_w=150\ \text{g}[/tex]
Heat lost will be equal to the heat gained so we get
[tex]m_mc_m\Delta T_m=m_wc_w\Delta T_w\\\Rightarrow c_m=\dfrac{m_wc_w\Delta T_w}{m_m\Delta T_m}\\\Rightarrow c_m=\dfrac{150\times 4.186\times 2}{19\times 76}\\\Rightarrow c_m=0.8696\ \text{J/g}^{\circ}\text{C}[/tex]
The specific heat of the metal is [tex]0.8696\ \text{J/g}^{\circ}\text{C}[/tex].
need some help with this
Answer:
Speed
Explanation:
cell phones use digital signals to send amd receive information. these digital signals travel as what kind of wave?
A.gamma rays
B.x-rays
C.microwaves
D.radio waves
Can I borrow a kiss? I promise I’ll give it back.
Answer:
No
Explanation:
WHAT
Answer:
no.............
If the half-life of a radioisotope is 250 years how much of a 96.0 gram sample will remain after 750 years
Answer:
12 grams
Explanation:
96g=0 years
48g=250 years
24g=500 years
12g=750 years
When moving across a row in the Periodic Table, which of the following increases?
compare the values of the spin quantum number for two electrons in the same orbital
GUYS REALLY, PLEASE HELP LIKE IM NOT KIDDING I NEED TO GET THIS DONE HELP ME
How are the processes of melting and freezing similar?
They are both processes that physically change a substance.
They are both processes where heat is absorbed by a substance.
They are both processes where heat is released by a substance.
They are both processes that chemically change a substance.
Please help will give 25 points!!!! Need help now!!!
Answer: They are both processes that physically change a substance.
Explanation:
Hurry please quick summary
In 1-2 complete sentences, explain where you can find visible light on the electromagnetic spectrum.
Use the "RAP" method to answer this short-answer question:
Restate the question.
Answer the question.
Prove your answer citing textual evidence from the course.
Don't forget to use complete sentences and proofread your answer.
Your answer:
Answer:
I NEED HELP TOO
Why does the salt reappear when the water ?
Answer:
Explain that as the water evaporates, water molecules go into the air. The water molecules that evaporate become a gas called water vapor. Only the water evaporates, leaving the sodium and chloride ions behind. The sodium and chloride ions attract each other and re- form salt crystals.
Hope this helps!! :D
