Answer:
The periodic table was created to organize the elements and provide physical and chemical properties, also to group with elements like it.
Hope this helps
need help asap
Calculate the frequency for a wavelength of 635 nm.
Answer:
472114107.086614 MHz
Explanation:
f = C/λ
λ: Wavelength in meters
C: Speed of Light (299,792,458 m/s)
Yo Brainlies❤️
I love you guys sm and i have to ask something
Whatt is cell membrane And give a sentence
Ahve great DAIESSSS
Answer:
cell membrains
Explanation:
Choose all the answers that apply. lonic compounds ___.
A. do not dissolve in water
B. have high melting points
C. have low melting points
D.dissolve easily in water
E. conduct electricity when melted
(science class not chemistry)
Answer:
E conduct electricity when melted
Explanation:
They can not produce electricity until dissolved/ melted in water
Can someone please help me
3. Which of the following is NOT an abiotic factor in an ecosystem?
Air pressure
Bacteria
Sunlight
Water
How many Groups is the modern periodic table divided into?
A. 2
B. 3
C. 7
D. 18
Answer:
18.
Explanation:
Define the term coordinate covalent bond and give an example.
please help, thank you :)
Answer:
A coordinate covalent bond is a bond in which both electrons come from the same atom.
Example: The bonding between the C atom and the O atom (carbon monoxide)
The reaction between ethylene and hydrogen bromide to form ethyl bromide is carried out in a continuous reactor. The product stream is analyzed and found to contain 58.7 mol% C2H5Br and 18.3 mol% HBr. The feed to the reactor conains only ethylene and hydrogen bromide. Calculate the fractional conversion of the limiting reactant and the percentage by which the other reactant is in excess. If the molar flow rate of the feed stream is 305 mol/s, what is the extent of reaction
Answer:
Explanation:
The first thing to do is to write out the chemical equation showing the reaction between the two chemical compounds.
C2H4 + HBr ------------------------> C2H5Br.
The chemical species/compounds reacted in the ratio of 1 : 1 : 1. That is one mole of C2H4 reacted with one mole of HBr to give one mole of C2H5Br.
So, we are given; C2H5Br = 58.7 mol%, HBr = 18.3 mol%. Thus, for C2H4, we have [ 100 - (58.7 + 18.3)] = 23 mol%. Therefore, the limiting reagent is HBr.
So, if we have 100 mol/s ;
C2H5Br = 100 × 0.587 = 58.7 mol/s, HBr = 100 × 0.183 = 18.3 mol/s and C2H4 = 100 × 0.23 = 23 mol/s.
Therefore, the total value of the flow rate in the feed = (HBr in feed) mol/s + (C2H4 in feed) mol/s = (58.7 + 18.3)mol/s + (58.7 + 23) mol/s =( 77 + 81.7) mol/s = 158.7 mol/s. .
So, 100/158.7 × 30.5 = 192.2.
Also the feed composition in HBr and C2H4 is;
HBr = 77/158.7 = 0.4852, C2H4 = 81.7/158.7 = 0.515.
Therefore, the number of HBr in feed and C2H4 in feed = 160m/s and 200m/s respectively (approx.)
Therefore, the fraction conversion is;
How do the molecules in a solid behave?
Answer:
They stay tight packed together!
Explanation:
Where in gasses, and everything is just floating around, and in liquids where the atoms are slightly more packed in, solids are very tightly packed together!
Which of the following statements is true about atoms?
Answer:
D
Explanation:
In a longitudinal wave, particle displacement is
from google, so I think the answer to that question is the second one
A + ion (positive ion, one with extra positive charge)?
Answer:
If an ion has a positive charge then it has lost an electrons.
Explanation:
So you don't "gain" anything when the ion has a positive charge. It loses an electron which means it has more protons than electrons. Thus, the ion has a positive charge. If it "gained" an electron then it would have a negative charge.
A single atom of an element has 11 protons, 11 electrons, and 12 neutrons. Which element is it?
OV
Na
Mg
Se
Answer:
Sodium has a mass number of 23amu. Since sodium has 11 protons, the number of neutrons must be 23 – 11 = 12 neutrons.
Explanation:
The mass number is given at the top left of the elements symbol, for example, sodium has a mass number of 23.
Sodium (Na) square from the periodic table. The mass number (23) is top-left. The atomic number (11) is bottom-left.
We know that the atomic number of sodium is 11. This tells us that sodium has 11 protons and because it is neutral it has 11 electrons.
The mass number of an element tells us the number of protons AND neutrons in an atom (the two particles that have a measurable mass).
Sodium has a mass number of 23amu. Since sodium has 11 protons, the number of neutrons must be 23 – 11 = 12 neutrons.
What does it mean to be an exact number? Give an example of an exact number.
Answer:
An exact number is a value that is known with complete certainty. Like for Examples of exact numbers are counted numbers of objects or certain unit conversions. For example, there are exactly 3 feet in 1 yard. There are exactly 12 eggs in a dozen. A class may contain exactly 25 students.
Explanation:
Hope this helps.
Have a good night ma´am/sir.
Be safe!
A woman is found dead on a boat floating in the middle of a lake at 4:30am. There is blunt force trauma to her head but no other discernable damage. She is approximately 30 pounds overweight. She is wearing thermal clothing and a winter jacket, gloves, and hat. Climatological data indicate it was a clear, cold, and windy night with no precipitation. Calculate the time of death based only on a body temperature of 15.6°C (60.8°F)? Now consider the other factors presented. How would each affect this estimation?
Answer:
Dead bodies lose one degree Celsius per hour, which we could deduce that the person died 12 hours ago.
Explanation:
On the other hand, it is very important to take into account that this number of hours is very approximate, since not only does it vary greatly with the environment and the acclimatization of the environment in which the person dies, but also in this specific case, insulating clothing was presented , which made the loss of body heat much more difficult and could easily be more than 12 hours.
The minimum for this particular situation is 12 hours to 24 hours possible postmortem.
What are two properties of most nonmetals
Answer: Summary of Common Properties
High ionization energies.High electronegativities.Poor thermal conductors.Poor electrical conductors.Brittle solids—not malleable or ductile.Little or no metallic luster.Gain electrons easily.Dull, not metallic-shiny, although they may be colorful.Explanation:
May I please have brainiest?
Answer:
The two properties of most non metals are high ionization energy and poor electrical conductivity. The correct option among all the options that are given in the question is option "1". In general it is known that nonmetals are very poor conductors of heat and electricity. The nonmetals that are solid are normally very brittle and has very little or no metallic luster at all. Nonmetals are highly reactive and show variety of chemical properties. It can also be pointed out that the nonmetals gain electrons very easily.
brainliest pleaseee :)
What type of graph can show a positive correlation, negative correlation, or no correlation?
A. Pie chart
B. Bar graph
C. Scatter plot
D. Line graph
Identify the techniques used to separate the components of the given mixtures.
1. Faucet with cloth
2. Nails attracted by magnets
3. Pouring off liquid from rice
4. Sorting buttons with different colors
5. Use of sieve to produce finer sand
Answer: 1.valving , 2. picking, 3. decantation , 4. sorting, 5. seiveing
Thank me later!
CAN SOMEONE HELP ME!!!!!!!!!!!!!
Answer:
5 g/cm^3
Explanation:
Density = mass / volume
please answer the “(fill-in)” ones thank you :)
Answer:
look
Explanation:
diffculte ou my good i need help too
What is the sum of the fractions 2/9+5/9
Answer:
7\9
Explanation:
please marl brainlieat
What is the full name for IUPAC
Answer:
International Union of Pure and Applied Chemistry
Explanation:
Hope this helps (:
Answer:
International Union of Pure and Applied Chemistry
Quais são os três tipos de tecidos musculares? E)celulas,estriado esqueletico, estriado liso. B)esttiadi esqueletico, liso, estriado cardiaco c)estriado liso, estriado esqueletico, estriado cardíaco. D)liso, celulas, esteiado cardíaco. ESSA PERGUNTA E DE CIENCIAS MAS NAO TEM VIENCIAS ALI PRA ESCOLHER;-;.
Answer:
c)estriado liso, estriado esqueletico, estriado cardíac
Explanation:
Los 3 tipos de tejido muscular filho cardíaco, liso y esquelético.
O músculo esquelético é responsável pelo movimento dos tons e das outras estruturas. La contracción del músculo cardíaco permite que o corazón bombee sangre. Los músculos lisos permitem que os alimentos se muevan a través del tracto digestivo y también ayudan al cuerpo a absorvedor los nutrientes.
PLZ HELP ME I WILL MARK BRAINLIEST. This is my THIRD time posting my question because people keep on putting random answers. If you do not know the question please do not answer it and leave it to someone else. Thank you, and my question is on the attached image below
Answer:
Are you looking for seasons on earth as it revolves around the sun? If so A is the spring equinox, C is the summer solstice, E is the autumn equinox and G is the winter solstice
Explanation:
HELP ME PLEASE!! Im IN A RUSH I NEED HeLP ! a government is worried that too many of its people are
unemployed. It decides to build several new highways that
cross the entire country, which will create thousands of
jobs for construction workers. The government hopes
these new workers will spend their wages at local
businesses and improve the economy.
The government actions described in the passage best show which concept?
A. Regulation
B. Taxation
O C. Spending
OD. Monetary policy
Answer: I believe the correct answer is D) Monetary policy
i would appreciate brainliest
Calculate the average atomic mass of unknown element X. You determine that isotope 127X makes up 80%, isotope 126X makes up 17%, and isotope 128X makes up 3%.
A. 127.10 amu
B. 126.86 amu
C. 127.54 amu
D. 126.20 amu
Answer:
Option B. 126.68 amu
Explanation:
The following data were obtained from the question:
Isotope A (¹²⁷X):
Mass of A = 127
Abundance (A%) = 80%
Isotope B (¹²⁶X):
Mass of B = 126
Abundance (B%) = 17%
Isotope C (¹²⁸X):
Mass of C = 128
Abundance (C%) = 3%
Average atomic mass of element X =.?
Th4 average atomic mass of X can be obtained as follow:
Average atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100]
= [(127 × 80)/100] + [(126 × 17)/100] + [(128 × 3)/100]
= 101.6 + 21.42 + 3.84
= 126.68 amu
Therefore, the average atomic mass of X is 126.68 amu
Several dams on the Colorado River in Texas produce electricity through hydropower. What is
an advantage of this type of energy production?
A: land is flooded when dams are built
B:Dams improve biodiversity by creating lakes out of rivers
C:hydropower provides renewable energy for human use
D:electricity can only be generated during daylight hours
Answer:
The answer is Hydropower provides...
Hydropower provides renewable energy for human use is the advantage of the production of electricity through hydropower. Therefore, option (C) is correct.
What are the advantages of hydropower?Hydropower is a renewable source of energy that is used to generate energy via hydropower relies on the water cycle. Hydroelectric power can be defined as a domestic source of energy, allowing it to produce its own energy without depending on international fuel sources.
The hydropower sector creates reservoirs that provide recreational opportunities such as swimming, fishing, and boating. Hydroelectric power is flexible and has facilities that can quickly go from zero power to maximum output.
They provide necessary backup power during major electricity outages or disruptions because hydropower plants can produce power to the grid immediately.
Hydropower is affordable and provides low-cost electricity and durability over time compared to other sources of energy. Hydropower benefits beyond electricity production by providing irrigation support, flood control, and clean drinking water.
Learn more about hydropower, here:
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1.why does gravity exist?
2.what does the strength of gravity on?
3.what will have stronger force of gravity, jupiter or earth ?
This class is science !!
Answer:
Gravity exists because elementary particles (electrons, quarks, and neutrinos), are NOT static with time and expansion. Matter is dynamic; elementary particles must continually accrete energy (the quanta of space) in order to conserve the continually increasing angular momentum of the expanding universe.
Strength of gravity
9.80665 m/s 2
Jupiter
2. Natural neon exists as a mixture of 90.92% neon-20, 0.26% neon-21, and 8.82% neon-
22. What is neon's average atomic mass? Show calculation.
Answer: sorry i cant help but d
Explanation:
sorry by
The average mass atomic mass of neon is 20.179 u.
What is average atomic mass?
The total of an element's isotope masses, each multiplied with its natural abundance, equals the element's average atomic mass. The periodic table shows the average atomic mass.
Calculation of average atomic mass is shown as:
The average atomic mass will be calculated by the formula.
Average atomic mass = ∑ mass × abundance / 100
Given data:
neon-20 = 90.92%
neon-21 = 0.26%
neon-22 = 8.82%
Put the value of given data in average mass formula.
average mass formula = (90.92 × 20 ) +(0.26 × 21) + (8.82 × 22) / 100
average mass formula = (1818.4 + 5.46+ 194.04) / 100
average mass formula = 2017.9/ 100
average mass formula = 20.179
Therefore, the average mass atomic mass of neon is 20.179 u.
To know more about average atomic mass.
https://brainly.com/question/13292428.
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Describe the forces on an object that is still.
Answer:
Unbalanced forces acting on an object will change the object's motion. Unbalanced forces can also stop a moving object. The three main forces that stop moving objects are friction, gravity and wind resistance. Equal forces acting in opposite directions are called balanced forces.
Explanation:
Answer:
gravity holds the object in place
Explanation:
