A sample of an element has a mass of 80.01g and a density of 2.70 g/cm3. How many significant figures does the mass have?
Answers
The mass has 4 significant figures
Further explanationRules for significant numbers
1. all non-zero numbers are significant numbers 2. a zero which is located between two non-zero numbers including a significant number 3. all zeros are located in the final row written behind the decimal point include significant number 4. zero decimal point is not significant numbera sample has mass = 80.01 g
a zero which is located between two non-zero numbers including a significant number, so the mass has 4 significant figures : 8,0,0 and 1
Related Questions
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
Answers
Answer: 1.valving , 2. picking, 3. decantation , 4. sorting, 5. seiveing
Thank me later!
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
Answers
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 many moles of NH3 can be produced from 3.76 moles of nitrogen
in the following reaction:
N2 (g) + 3 H2 (g) → 2 NH; (g)
Answers
= 7.25 mole NH3
The number of moles of NH₃ obtained from the reaction is 7.52 moles
The balanced equation is given below:
N₂ + 3H₂ —> 2NH₃From the balanced equation above,
1 mole of N₂ reacted to produce 2 moles of NH₃.
Finally, we shall the number of mole of NH₃ produced by the reaction of 3.76 moles of N₂. This can be obtained as follow:
From the balanced equation above,
1 mole of N₂ reacted to produce 2 moles of NH₃.
Therefore,
3.76 moles of N₂ will react to produce = 3.76 × 2 = 7.52 moles of NH₃.
Thus, 7.52 moles of NH₃ were obtained from the reaction.
Learn more: https://brainly.com/question/9945440
Which of the following configurations would form a bent molecule?
A. A molecule with three bound atoms and no lone electron pairs
B. A molecule with two bound atoms and no lone electron pairs
C. A molecule with one bound atom and two lone electron pairs
D. A molecule with two bound atoms and one lone electron pair
Answers
Answer:
D
Explanation:
Apex
Answer: D
Explanation:
A P E X ( I just clicked it and it’s right)
Which statement describes an unanticipated impact of a technological
advance?
O A. Birds known as starlings were introduced to North America from
Europe and have since competed with native species for
resources.
O B. A laser system developed by NASA to help spaceships dock with
space stations was later adapted to help doctors perform eye
surgery.
O C. Used glass can be recycled as an additive to concrete, which gives
structures made of concrete more strength and better thermal
insulating properties.
O D. A network of undersea cables was constructed to provide Internet
connections between continents that are faster and more reliable
than other transmission methods.
Answers
Answer: D A laser system............
Explanation:
Answer:
O B. A laser system developed by NASA to help spaceships dock with
space stations was later adapted to help doctors perform eye
surgery.
Explanation:
The temperature at which a substance in its solid state melts into the same substance in a liquid is known as
Answers
Answer:
0 C
Explanation:
In an ionic bond
a. electrons are shared equally
b. protons are transferred
c. electrons are shared unequally
d. electrons are transferred
Answers
Answer: a chemical bond; in which one atom donates an electron to another atom
Explanation:
PLZ HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answers
Answer:
Reactivity
Explanation:
Luster. Ductile, and Malleabillity are all physical.
Does changing the number of neutrons change the identity of the element you have built?
Answers
Answer:if u change the number of neutrons u will .get an isotope of the same element.
Explanation: neutron can make an atom radioactive
How many Groups is the modern periodic table divided into?
A. 2
B. 3
C. 7
D. 18
Answers
In chemistry, a group is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table; the f-block columns are not numbered.
Answer:
18.
Explanation:
Directions: Use the words in the word box to complete the following sentences.
acceleration
gravity
counteract
resistance
balanced
force
When the forces acting on an object are _______________ , there is no change in the object's motion.
A _________________ acting on a resting object can cause the object to move.
On Earth, __________________ pulls all objects toward the ground.
When a force acts in the opposite direction of another force, the forces ______________ each other.
More than one force acting on a falling object can reduce its downward ____________________.
Air _____________________ is caused by molecules of air pushing against a moving object.
Answers
Answer:
if u answer my today's a pic quatiom I will give u ur any questions
Answer:
balanced
resistance
gravity
counteract
acceleration
Which statements describe functions of the backbone? Check all that apply.
o It supports the body's weight.
O It helps to break down food.
It surrounds and protects the brain.
It replaces the spinal cord in vertebrates.
O It allows for flexibility and movement.
It helps regulates water balance.
The answer is it supports body weight and it allows flexibility and movement
Answers
Answer:
A and E
Explanation:
Backbone is the part of skeletal system and is made of 26 vertebrae in total. The backbone and bones of lower limbs together serve to support the body's weight. Backbone surrounds and protects the spinal cord. Since the vertebrae of backbone are joints together by synovial joints, it allows the flexibility and movement of organisms.
Answer:
flexibility and movement
If 130 J of energy were added to 1 kg of each of these samples, which would experience the GREATEST temperature
increase?
A) Aluminum
B) Brass
C) Copper
D) Platinum
Answers
Answer: D
Explanation: Platinum
The government, through the FCC (Federal Communications Commission), has set rules and guidelines for the use of radio equipment to better control wireless frequency "traffic".
A wireless server gives off 3.3 X 10-24 joules of energy. What is the wavelength of this server in meters?
Answer
A 22x10-57 m
B 60 X 10-52 m
5.0 X 100m
D 9.1 X1031m
Answers
Answer:
Wavelength = 0.06024 m
Explanation:
Equation of energy of wavelength from Einstein's relativity equation is;
E = hc/λ
Where;
h is Planck's constant = 6.626 × 10⁻³⁴ J. s
c is speed of light = 3 × 10⁸
We are given E = 3.3 × 10^(-24) J
Making wavelength λ the subject, we have;
λ = hc/E
Thus;
(6.626 × 10⁻³⁴ × 3 × 10⁸)/(3.3 × 10^(-24)) = 6.024 × 10^(-2) = 0.06024 m
Wavelength = 0.06024 m
Yo Brainlies❤️
I love you guys sm and i have to ask something
Whatt is cell membrane And give a sentence
Ahve great DAIESSSS
Answers
Answer:
cell membrains
Explanation:
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
Answers
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:
FAST I NEED THIS TO STUDY MY QUIZ IS TOMORROW!!!!
How is an atom’s atomic number related to its number of protons? To its number of electrons?
Answers
Answer:
The atomic number equals the charge on the nucleus. It therefore also equals the number of protons in the nucleus and also equals numerically the number of electrons in the neutral atom. The atomic number has the symbol Z.
Explanation:
make me as brain liest
Answer:Here u go!
Explanation:
The number of protons, neutrons, and electrons in an atom can be determined from a set of simple rules. The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons.
Hope this helps
There is no pattern between boiling point and where the substance is located on the periodic table.
O True
O False
Answers
Answer:
i belive this is false there is not a pttern
Explanation:
Answer:
Melting and boiling point are not clear (do not have uniform pattern) in the periodic table.
So, true.
What are two properties of most nonmetals
Answers
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 :)
The size of the gray circle represents atomic radius, or
the size of an atom. Which area of the periodic table
has elements with the largest atomic radius?
Answers
Answer: Here u go
Explanation:
Atomic radii varies in a predictable way across the periodic table. The atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.
Selena breaks a piece off the end of a stick she found and notes that’s a physical change has occurred which of the following properties of the remaining piece of the stick has changed
Answers
why does a liquid take the shape but not the volume of its container
Answers
Answer:
The attraction between the particles in a liquid keeps the volume of the liquid constant. The movement of the particles causes the liquid to be variable in shape. Liquids will flow and fill the lowest portion of a container, taking on the shape of the container but not changing in volume.
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.
Answers
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.
#SPJ2
(13 POINTS + BRAINLIEST) On a hot and windy day a farmer is cleared all the grasses from a field next to a stream in order to plant some crops. He worked all day removing the grasses, and planting seeds for his next crop. The next day the farmer noticed that half of his field had eroded away. What choice below best describes why the river was able to erode so much of the field?
A.
The wind blew the freshly cleared dirt in the field away.
B.
The river was eroded the ground since the grasses and roots were removed.
C.
Animals dug into the freshly cleared dirt looking for food.
D.
The hot temperatures caused the ground to crack and fall apart.
Answers
Answer:
B, The river was eroded the ground since the grasses and roots were removed.
Explanation: when you have roots in the ground they would soak up the water but because he removed the roots, The water goes where it used to and it eroded the ground.
The ___ has many functions; one is to regulate growth.
Answers
Growth hormon somatotropin
In a longitudinal wave, particle displacement is
Answers
from google, so I think the answer to that question is the second one
A sample of a gas occupies 6.00 liters at a temperature of 200 K. If the pressure remains constant and the temperature is raised to 600 K, the volume of gas sample would be 1.)18.0 L 2.)2.00 L 3.)3.00 L 4.)12.0 L
Answers
Answer:
18
Explanation:
The volume of the gas should be 1. 18.0 L
Calculation of the volume of the gas;Since A sample of a gas occupies 6.00 liters at a temperature of 200 K. If the pressure remains constant and the temperature is raised to 600 K
So here the volume of the gas should be
= 600 * 6 /200
= 18.0 L
hence, the first option is correct.
Learn more about temperature here: https://brainly.com/question/17895578
Burning is a type of_________reaction.
O replacement
O decomposition
O synthesis
O combustion
Answers
Answer:
Combustion
Explanation:
Happy Halloween!
CAN SOMEONE HELP ME!!!!!!!!!!!!!
Answers
Answer:
5 g/cm^3
Explanation:
Density = mass / volume
what types of cells did Matthias Schleiden study?... HELP PLZ!!!
Answers
Answer:
plants or The Cell Theory
Explanation:
