Answer:
y = 2.77 cm
Answer: The third dimension is 2.77 cm
An element has an atomic number of 16. An ion of this element has a 2- charge. How is the ion formed?
Answer: Atomic number 16 is sulfur (S). It has 6 valence electrons and needs two more to complete it's outer shell to 8 electrons. It will steal those electrons from elements theat need to lose electrons to achieve a full valence shell (lower energy shell).
Explanation: Sulfur's valence shell is 3s^2_3p^4. It needs two more electrons to fill the 3p orbital to 6 electrons. This is a lower energy state and so sulfur will remove, or share, electrrons from elements that benefit from losing an electron to achieve a lower energy state.
A scientist who wants to study the effects of a new fertilizer on plants would probably
Answer:
1 no is answer give each experiment group the same amount of fertilizer
 A famous scientist has a hypothesis that is different from the current scientific theory. What should happen to the scientist hypothesis?
Answer:
The hypothesis is just a question based upon an observation. The hypothesis would have to be tested in order to evival the theory.
Explanation:
A study of reaction _______ is called chemical ________ .
Answer:
The study of reaction "Rates" is called Chemical "Kinetics.
What is the molar mass of C3H8O2? (Round to three significant figures)
Answer:
The molar mass of [tex]C_3H_8O_2[/tex] (rounded to three significant figures) is 76.1 amu.
Step-by-step explanation:
Hey there!
To answer this question, you will need access to a periodic table. You need to know the atomic masses of carbon (C), hydrogen (H), and oxygen (O) in order to answer this question. With that out of the way, let's begin!
We have a chemical formula: [tex]C_3H_8O_2[/tex].
The letters are element symbols, which are basically the code for an element. Think of it as an abbreviation or something similar to an ID.The subscripts (numbers) help us identify how many atoms of each element are included in the substance.The first thing we should do is locate C, H, and O on a periodic table and figure out the atomic masses for each element. This will help us determine the total molar mass of the substance.
Determining the Atomic Mass of CIf we locate C on a periodic table, we see that its atomic mass is roughly 12.01 amu (atomic mass units). Then, we have a subscript of 3, so we simply multiply the subscript by the given atomic mass in order to find the atomic mass of the three atoms of carbon.
[tex]3 \times 12.01 = 36.03 \text{ amu}[/tex]
This means that C accounts for 36.03 amu of the molar mass of the substance.
Determining the Atomic Mass of HUsing the same principle as before, we want to find the atomic mass of one atom of H. This is 1.008, so we will multiply 1.008 by the eight atoms (pay attention to the subscript) in order to find the atomic mass of hydrogen in the substance.
[tex]8 \times 1.008 = 8.064 \text{ amu}[/tex]
This means that H accounts for 8.064 amu of the molar mass of the substance.
* An important note to add is that we should never round our values until the end of the problem so we make sure to get as close as possible (this is why you learn about accuracy and precision in a chemistry class).
Determining the Atomic Mass of OFinally, we want to find the atomic mass of O in the substance, so we'll use the same method as before and locate the atomic mass of one atom of oxygen. We find that this is 15.999, which would definitely round to 16.00, but remember the rules for rounding in chemistry in order to be as accurate as possible. Since our subscript is 2, we know that there are two oxygen atoms, so we will multiply the atomic mass of oxygen by 2.
[tex]2 \times 15.999 = 31.998 \text{ amu}[/tex]
This means that O accounts for 31.998 amu of the molar mass of the substance.
Summation of the Determined Atomic MassesAfter you have determined the atomic masses of the atoms in the chemical substance, you have to add these together. This is performed with simple addition.
C = 36.03 amuH = 8.064 amuO = 31.998 amuNow, let's add these together.
[tex]36.03 \text{ amu} + 8.064 \text{ amu} + 31.998 \text{ amu} = 76.092 \text{ amu}[/tex]
Therefore, the total atomic mass is 76.092 amu.
Rounding to Meet Significant Figures RequirementsSignificant figures are used to determine the accuracy of a problem. A basic rule is to use scientific notation to determine how to meet the significant figure request. Since we are rounding to three significant figures, we want to make sure these three figures are significant. There are three basic rules to remember when computing significant figures:
Any zeroes to the left of the first non-zero number (ex: 0.0981) are insignificant.Any zeroes "trapped" in between other non-zero numbers (ex: 9.81075) are significant.Any zeroes to the right of the last non-zero number (ex: 5900) are significant ONLY IF they are added after a decimal point and included in the measurement (ex: 5900.)Therefore, since we need three significant figures, we have to round our value first and then determine the appropriate number of significant figures.
76.092 will round to 76.09 first, and then round to 76.1. We cannot use 76.09 since there is a trapped zero, which is considered significant.We must use 76.1 since there are three significant figures in the value.Final AnswerSince we have determined that 76.1 fits our requirements for three significant figures, we can safely determine that the molar mass of [tex]C_3H_8O_2[/tex], as determined, is 76.1 amu.
= 3 × Mass of C + 8 × Mass of H + 2 × Mass of O
= (3 × 12.01 + 8 × 1.008 + 2 × 15.999) g/mol
= (36.03 + 8.064 + 31.998) g/mol
= 76.092 g/mol
Answer:
76.092 g/mol
Hope you could get an idea from here.
Doubt clarification - use comment section.
The metal zirconium becomes superconducting at temperatures below 3.4000K.
Calculate the temperature at which zirconium becomes superconducting in degrees Celsius. Be sure your answer has the correct number of significant digits.
Answer:
-269.75 degrees Celsius
Explanation:
A cup of hot tea cools down
a
Chemical Change
b
Physical Change
Answer:
Physical change
Explanation:
No new substances were produced so it is physical change.
Answer:
Physical Change
Explanation:
Since only the temperature is changing not the structure of tea its a physical change. Good luck ;)
Write electronic configuration of first 30 elements in their sub shell
Answer:
Helium (He) 1s2
Lithium (Li) [He] 2s1
Beryllium (Be) [He] 2s2
Boron (B) [He] 2s2 2p1
Explanation:
please mark me brainleast
. Arrange the following in order of increasing radius:
a) Mg2+, Na+, Al3+
b) Na+, Al3+ , Mg2+
c) Mg2+ , Al3+ , Na+
d) Al3+ , Mg2+, Na+
guys pls help i will venmo you money
Answer:
Al3+<Mg2+<Na+
Explanation:
this is because of nuclear charge (no. of protons)
atomic radius is inversely proportional to nuclear charge.
ASAP. Five stars + brainless.
A procedure calls for 4 parts reagent A to 16 parts water.What is the dilution of reagent A in water?
a) 4/16
b) 1/5
c) 1/4
d) 4/12
my guess answer iss 1/4 if incorrect sorr
1/5 is the dilution of reagent A in water.
Explanation:
The dilution factor of the diluted solution is determined by dividing the final volume of the diluted solution by the volume of the undiluted solution.[tex]D.F.=\frac{V_f}{V_i}[/tex]
Where:
D.F = Dilution factor
[tex]V_f[/tex] = Final volume of the diluted solution
[tex]V_i[/tex]= Initial volume of the undiluted solution
And the dilution is represented as 1 : D.F.Given:
4 parts of the reagent and 16 parts of water are mixed together to form a diluted solution.
To find:
The dilution of reagent A in water
Solution:
Parts of reagent A =[tex]V_i = 4[/tex]
Parts of water = 16
Final volume of solution = [tex]V _f = 4 + 16 = 20[/tex]
The dilution factor of reagent A:
[tex]D.F=\frac{20}{4}=5[/tex]
The dilution of the reagent A = [tex]1:5=\frac{1}{5}[/tex]
1/5 is the dilution of reagent A in water
Learn more about Dilution here:
brainly.com/question/9920151?referrer=searchResults
brainly.com/question/15213606?referrer=searchResults
What is the control in the experiment?
Answer:
C. the amount of drug x given to mice
Should I take chemistry in high-school? Is it easy or hard?
Answer:
Yes, If you understand it's easy
Explanation:
Although, chemistry is a fun subject which includes learning about chemical and experiments.
"If you like my answer mark as brainlist" ☺️.
Answer:
may be
Explanation:
if u want to study chemistry.then here are some advantages.Chemistry teaches useful skills. Because it is a science, learning chemistry means learning how to be objective and how to reason and solve problems. Helps you to understand current events, including news about petroleum, product recalls, pollution, the environment and technological advances.
How many moles of hydrogen are produced when 6.28 mol of oxygen form?
Answer:
3.14 is the answer
Explanation:
hope it may help you
When Hydrogen and Oxygen
form a molecule, what happens to their neutrons?
A. They share their neutrons:
B. They both lose neutrons.
C. Nothing happens to their neutrons.
Acid rain damaging marble
a
Chemical Change
b
Physical Change
Answer:
B
Explanation:
Acid rain
damaging a marble statue or anything else
is a physical change. <3
this is for anyone who’s good with science coz I absolutely hate it. ILL BRAINLIST U AND GIVE U 5 STAR TO WHOEVER IS GOOD;) be specific and use ur own words please! thankyou. and good luck LOL.
conclusions:
The burning candle is an example of a combustion reaction.
a) What do all combustion reactions require?
b) What do all combustion reactions produce?
c) Write a general word equation for the combustion reaction.
Answer:
A) Oxygen
B) Heat
C)
Explanation:
Hope it helps
Answer:
a) oxygen is nessasary for all combustion to occur
b)carbon dioxide and water
c)for example combustion of methane:
CH4+2O2 -------> CO2+H2O1. Based on the Law of Conservation of Mass, if
100g of sodium metal reacts with 25g of
chlorine gas, what will be the total mass of the
product, sodium chloride, created in the
chemical reaction?
2 Na Cl2
2NaCl
100gm + 25gm
+
?
[tex]\boxed{\sf {Na\atop Sodium}+{Cl\atop Chlorine}\longrightarrow {NaCl\atop Sodium Chloride}}[/tex]
Na=100gCl=25g.Mass of reactants :-[tex]\\ \sf\longmapsto Na+Cl[/tex]
[tex]\\ \sf\longmapsto 100+25[/tex]
[tex]\\ \sf\longmapsto 125g[/tex]
Mass of NaCl=125g
question : what are isotopes
Answer:
Isotopes are versions of the same element. They have the same number of protons and electrons as the element but different mass numbers and number of neutrons.
Explanation:
one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table.
what happens to the food dye in hot water?
Answer:
The food coloring mixes through the hot water faster than it mixes with the cold water. The reason for this is because in hot water, the water molecules have more energy and are moving faster than the molecules of cold water. This makes it way more easier for the dye to get mixed throughout the hot water.
Explanation:
4. Which of the following are not able to
travel through empty space?
A. gamma rays
C. sound waves
B. ultraviolet waves
D. light waves
Answer:
C.Sound waves.
Hope it helps you.How is energy stored in a Van der Graaf generator?
A. Energy is stored in the nucleus
B. Energy is not stored
C. Energy is stored in the chemical bonds
D. Energy is stored in an electrical field
Answer:
C
Explanation:
A Van de Graaff generator is an electrostatic generator which uses a moving belt to accumulate electric charge on a hollow metal globe on the top of an insulated column, creating very high electric potentials. It produces very high voltage direct current (DC) electricity at low current levels
!!DUE TODAY, NEED HELP ASAP!!
A student measured the masses of some aluminum and copper cylinders of different volumes. The data is displayed below:
Aluminum: Copper:
Volume (mL)
Mass (g)
Volume (mL)
Mass (g)
3.7
9.99
1.8
16.02
6
16.2
2.3
20.47
8.5
22.99
3.5
31.15
10.74
29
4.2
37.38
15
40.5
5.8
51.62
On graph paper graph the data above on ONE graph. Use the graph paper so the longer side is your y-axis.
Use up the majority of the graph paper. Do not make a small graph!
Use a ruler/straight edge so you graph is neat.
You will need to plot the points for each substance and create a double line graph. When connecting your points for each substance, continue the lines past the plotted points.
Be sure to include a key to identify the substances.
Make your X-axis volume(mL) and your Y-axis mass(g)
Look at the numbers for both substances when creating your scales. You will most likely have a different scale for mass and volume. What is the lowest number? What is the highest number? What does it make sense to go by?
Calculate the density of each metal.
Aluminum:_________________________ Copper:________________________
What happens to the mass of the copper at the volume increases from 6 to 8mL?
Which sample is more dense? How does the graph show you this?
Answer: The data are not arranged in a useful pattern. I arranged them as best I could and made a graph in Excel for demonstration.
Explanation: The data are plotted with mass on the x axis and volume on the y. Add a key to identify the top line as CU and the bottom as Al.
The density of Cu is 8.9 g/ml and 2.70 for Al.
The mass of copper increases by 17.8 grams going from 6 to 8 ml. (8.9 g/ml)*(2 ml) = 17.8 grams.
Copper is more dense. c The graph shows that for the same volumes, copper has the higher mass.
Give an example of a non-biological chemical reaction that involves carbon. Name the process that converts a solid compound into a gas.
Answer: The combustion of methane (CH4) with O2.
Explanation: This is a chemical reaction involving carbon:
CH4 + 2O2 = CO2 + 2H2O
[ ] CH4 + [ ] O2 → [ ] CO2 + [ ] H2O
Answer:
Explanation:
These kinds of equations are very mechanical. They are all done the same way.
First the hydrogen. There are 4 hydrogens on the left and only 2 on the right. So you must put a two in front of the the water.
[ ] CH4 + [ ] O2 → [ ] CO2 + [ 2] H2O
Now the carbons. There's one on the left and one on the right, so they are balanced. I'd put a 1 on both anyway.
[ 1] CH4 + [ ] O2 → [1 ] CO2 + [ 2] H2O
Finally the oxygens. There's 2 on the CO2 and 2 on the water (that 2 in front multiplies the 1 water into 2 oxygens because the right is really H2O + H2O.)
So 2 from CO2 and 2 From H20 makes 4 altogether.
There's only 2 on the right, so you have to multiply the O2 by 2
[1 ] CH4 + [2 ] O2 → [1 ] CO2 + [2 ] H2O
Detection of nitrongen ??
Answer:
The extract is boiled with FeSO4 and acidified with concentrated H2SO4. The appearance on Prussian blue colour indicates the presence of nitrogen
Explanation:
PLS mark it brainliest
What are the missing coefficients for the chemical equation
[ ] Ca + [ ] O2 → [ ] CaO
Answer:
[tex]{ \sf{[ 2] Ca_{(s)} + [1 ] O_{2(g)} → [ 2] CaO _{(s)}}}[/tex]
The strength of van der Waals forces increases as:
A. molecular size decreases
B. molecular size increases
C. number of electrons increases
D. number of electrons decreases
Answer:
B and C
Explanation:
is it multiple choice question??
Van der Waals forces are the interaction between the molecules and the atoms. It increases with an increase in the molecular size and the number of electrons. Thus, options B and C are correct.
What are Van der Waals force?
Van der Waals forces are the weak forces of attraction and repulsion present between the atoms and the molecules of the compounds. They are also called London Dispersion Forces and dipole-dipole forces.
An increase in the number of electrons and size of the molecule increases the surface area and the electron cloud which in turn, increases the Van der Waals force.
The intermolecular force increases as in large atoms or molecules the valence are held loosely as they are far from the nucleus or the center of the atom.
Therefore, the size and the electron increase the Van der Waals force.
Learn more about Van der Waals force here:
https://brainly.com/question/11457190
#SPJ5
WILL MARK BRAINLEST IF CORRECT!
1) Burning toast physical or chemical
2) Cooking eggs: physical or chemical
3) Melting butter: physical or chemical
4) Removing the pulp (solid) from the orange juice using a juice strainer.: physical or chemical
5) Cutting the toast with a knife: physical or chemical
6) Digesting the food: physical or chemical
4.250 x 10-6 nm in standard form , please help!!
Answer: 4,250 x 10 - 6
Explanation: ok so we have a decimal number, what you do with that is
[tex]4.250 x 10^{3}[/tex] = 4.250 x 1,000 = 4,250 now you can just move the decimal every time without that equation but its better safe. I'm pretty sure that's how they want it, because its not expanded or word.
Which statement correctly compares the number of protons and electrons in atom of rubidium (Rb) and Calcium (Ca)?
The question is incomplete, the complete question is;
Which statement correctly compares the number of protons and electrons in atoms of rubidium (Rb) and calcium (Ca)?
Rubidium has fewer protons and fewer electrons than calcium.
Rubidium has fewer protons and more electrons than calcium.
Rubidium has more protons and fewer electrons than calcium.
Rubidium has more protons and more electrons than calcium.
Rubidium has 37 electrons and protons as well as 48 neutrons. Calcium has 20 electrons, protons and neutrons.
Rubidium is a group 1 element while calcium is a group 2 element. Rubidium has more protons and more electrons than calcium.
Rubidium is an element in group one of the periodic table. It has 37 electrons and protons as well as 48 neutrons.
Calcium is an element in group two of the periodic table. It has Calcium has 20 electrons, protons and neutrons.
From the foregoing, we can see that Rubidium has more protons and more electrons than calcium hence the answer.
Learn more; https://brainly.com/question/7373020