There are 4.9 × 10²⁴ atoms in 88.0 grams of Boron.
HOW TO CALCULATE NUMBER OF ATOMS:The number of atoms in a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number (6.02 × 10²³). The number of moles in 88.0 grams of Boron can be calculated as follows:no. of moles = 88/10.81
no. of moles = 8.14 moles
The number of atoms in Boron is calculated as follows: 8.14 moles × 6.02 × 10²³= 4.9 × 10²⁴ atoms of Boron.
Therefore, there are 4.9 × 10²⁴ atoms in 88.0 grams of Boron.
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I kinda need help pla
1.) how many grams is 1.09 moles of Mg3N2?
2.) How many moles are in 7.55 g of KBr?
3.) what is the mass, in grams, of 0.48 moles of Na2O?
4.) how many moles is 14 grams of SrCI2?
Answer:
1. 110 grams
2.0.06 moles
3. 129.1 grams
4. 0.08 moles
Explanation:
Of a cell membrane allows it to control material Entering and leave a cell?
Answer:
The cell membrane is the outer layer of the cell. The primary function of the cell membrane is to regulate what substances enter and leave the cell. The cell membrane is selectively permeable, or "semi-permeable", meaning that the membrane only allows certain substances to enter or leave the cell.
Explanation:
already had this question and this is the correct answer
Sometimes people say that the air is thinner high up on a mountain is that true
Answer:
Yes
Explanation:
As altitude increases, the amount of gas molecules in the air decreases—the air becomes less dense than air nearer to sea level. This is what is meant by "thin air".
Answer:
Yes because the air becomes less compressed and is therefore thinner.
Explanation:
which two conditions can limit the usefulness of the kinetic-molecular theory in describing gas behavior
Answer:
The two conditions that can limit the usefulness of the kinetic-molecular theory in describing gas behavior are "high pressure" and "low temperatures". At low temperatures or high pressures, real gases deviate significantly from ideal gas behavior.
Explanation:
WORTH 10 POINTS!! Strawberry plants produce offspring through asexual reproduction. Which statement is true about strawberry plants?
They are identical to the single parent.
They have characteristics of both parents.
Answer:
They are the same as one parent :)
Explanation: that is why we have more yellow corn than black corn because people planted only yellow corn to make more yellow corn :D
I'll give BRAINLIEST!!!
HELP FAST PLEASE!
Explain how water turns from a liquid to a gas, gas back to a liquid and liquid to a solid.
Answer:
It's all about temperature, when water heats, it turns to a gas - like water on the stove. When heat is reduced, it goes back to a liquid, and when it's frozen (like an ice cube) it's now a solid.
Explanation:
Answer:
Evaporation liquid to a gas. Liquid to solid is freezing.
Gas to liquid is condensation.
Explanation:
HELP ASAP no longer than 30 seconds
Answer:
Wont show pic sorry
Explanation:
If you can get the pic to work i could solve it for you
Answer:
HR
Explanation:
HR stands for hour
Which sequence of atomic numbers represents elements that have similar chemical properties?
A. 3, 12, 21, 40
B. 4, 20, 38, 88
C. 9, 16, 33, 50
D. 19, 23, 30, 36
Given what we know about elements of the periodic table and their properties, we can confirm that the list with elements that have very similar properties is option B.
How do we know that option B list elements with similar properties?The periodic table has a very specific organization.One of the many ways in which it is organized is by groups. It is often divided into 9 groups, usually color-coded. The elements that are in the same group all share similar properties. Option B lists 4 elements of the Alkaline-earth metals group.Therefore, we can confirm that since option B is the choice that lists all elements pertaining to the same group, in this case, the Alkaline-earth metals, it is the correct option as they will all have very similar properties.
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is jewelry gold an element, compound or mixture?
How many moles of NH4SO4 are in 17.492 grams
Answer: 0.13 moles
Explanation:
HELPP ME PLS
Why is the collision theory considered to be well- established and highly reliable ?
Answer:
The collision theory considered to be well- established and highly reliable, because it never breaks.
Explanation:
NUCLEAR REACTION! Help!!!!
Answer:
The example of alpha decay.
Explanation:
¹⁷⁵₇₈Pt → ¹⁷¹₇₆Os + ⁴₂He
The example of alpha decay.
Properties of alpha radiation:
Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number less than 4 and atomic number less than 2 as compared to parent atom the starting atom.
Alpha radiations can travel in a short distance.
These radiations can not penetrate into the skin or clothes.
These radiations can be harmful for the human if these are inhaled.
These radiations can be stopped by a piece of paper.
Another example:
₉₂U²³⁸ → ₉₀Th²³⁴ + ₂He⁴ + energy
The Earth's axis changes direction (but the angle does NOT change).
is called what ?
Answer:
Axial precession
Explanation:
It happens ever ~26'000 years.
Brianna only has to answer 20% of her math packet. If there are 70 questions in the packet, how many questions must she answer?
Please select the word from the list that best fits the definition
Use of this device led to the discovery of cells
a. cells b. microscope c. cell theory
PLZ HURRY
6. (10 Points) The volume of a helium balloon in Los Angeles is 14.0 L The
temperature in Los Angeles is 25°C. Find the volume of the balloon in
Death Values where the temperature is 52°C, with the pressure being the
same in both places.
PLS HURRY
Answer:
V₂ = 15.27 L
Explanation:
Given data:
Initial volume = 14.0 L
Initial temperature = 25°C (25 + 273.15 = 298.15 k)
Final temperature = 52°C = (52+273.15 = 325.15 k)
Final volume = ?
Solution:
Charles 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 = 14.0 L × 325.15 K / 298.15 k
V₂ = 4552.1 L.K / 298.15 K
V₂ = 15.27 L
what do gasses have
Answer:
Explanation:
Gas is a state of matter that has no fixed shape and no fixed volume. Gases have lower density than other states of matter, such as solids and liquids. There is a great deal of empty space between particles, which have a lot of kinetic energy.
Answer:
Gas is a state of matter that has no fixed shape and no fixed volume. Gases have lower density than other states of matter, such as solids and liquids. There is a great deal of empty space between particles, which have a lot of kinetic energy.
Explanation:
The activation energy of a reaction is 55.8 kJ/mol and the frequency factor is 1.5×10^11/s.
Calculate the rate constant of the reaction at 24 ∘C
Answer:
23.0 s⁻¹ is rate constant
Explanation:
Using the Arrhenius equation:
k = A * e^(-Ea/RT)
Where k is rate constant
A is frequency factor (1.5x10¹¹s⁻¹)
Ea is activation energy = 55800J/mol
R is gas constant (8.314J/molK)
And T is absolute temperature (24°C + 273 = 297K)
Replacing:
k = 1.5x10¹¹s⁻¹ * e^(-55800J/mol/8.314J/molK*297K)
k = 1.5x10¹¹s⁻¹ * 1.53x10⁻¹⁰
k = 23.0 s⁻¹ is rate constant(Revision) When magnesium, Mg, form magnesium ions, Mg2+, has it beer
oxidised or reduced? *
Answer:
it has oxidized because it has has given out 2 ions
Answer:
Oxidised
Explanation:
Mg -------> Mg2+ +2electrons
In this case Mg loses two electrons and loss of electron is oxidation so Mg oxidised.
You and your science group have been handed five mineral samples to identify. First, you sort the minerals by color. One has many
colors. The group decides that it is either fluorite or quartz. What other property would help you identify the mineral?
A)
luster
B)
hardness
C)
acid test
D)
crystal structure
Hurrry
im pretty sure it is b
tghj
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What are typical characteristics of metals?
lonization energy
Electron affinity
A
low
low
B.
high
high
C.
high
low
D.
low
high
Answer:
A
Explanation:
Metals has low Ionization energy and low electron affinity. (Option A)
Characteristics of Metals (Ionization energy/Electron Affinity)Metals has low ionization energy because the valence electrons in alkali metals, are very away from the nucleus. Hence, they can easily lose electrons with low energy and become cationic.
Metals have a low electron affinity because they want to give up their valence electrons rather than gain electrons, which require more energy than necessary.
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why we need gravity explain in your own words
Answer:
Gravity is very important for us,animals and plants. We could not survive Earth without it. The sun's gravity keeps Earth in orbit around it, keeping us a good distance away from it (the sun). Gravity is holding down our atmosphere and the air we need to breathe along with it.
The density of water is 1.00 g/mL. If your swimming pool holds 208,000 gallons of water, what is the weight of the water in a filled swimming pool in tons? (1 ton = 2000 lb).
Hint: Look on your equation sheet for conversion factors
Answer:
12.455≈12.5 tons
Explanation:
1 US gallon of water (gal) = 8.35 pounds of water (lb wt.)
so we divide 208,000 by 8.35 to covert to pounds
then divide the pounds by 2000 to convert to tons.
PLEASE HELP!
Prevailing winds cause ocean currents to move in the same direction as the winds
O Claim 1: in all places in the ocean.
O Claim 2: in some places in the ocean.
Claim 3: nowhere in the ocean.
which claim is it?
Answer: due to the nature and complexity of some documents, an accessible version of the ... 1. Grade 6 Science Learning Activity. Ocean, Atmosphere, & Climate Unit ... We started this unit by making initial claims about why Christchurch's air ... Ocean currents move in the same direction as the prevailing wind in some places in the.
Explanation:Ocean water is on the move, affecting your climate, your local ecosystem, and the ... Map of temperature of the North Atlantic Ocean shows the warm Gulf Stream current along the. Winds, water density, and tides all drive ocean currents. ... much of Northern Europe significantly warmer than other places equally as far north.
We have a cylinder. Calculate the following:
What is the cylinder's mass?
Data:
Volume: 376.8m3
Mass: x
Density: 1000km/m3
Answer:
mass = 2.65 [nearest hundredth].
Explanation:
Mass = Density / Volume
mass = 1000 / 376.8
mass = 2.653927813163.. ≈ 2.65
metallic bonding lattice structure true or false
Answer: true
Explanation: I looked it up
Which of the following statements are true about whether atoms tend to gain
or lose electrons?
Answer:
C and D
Explanation:
Atoms with five, six or seven valance electrons gain electrons to complete the octet because it is more convenient for the atoms to gain three, two or one electron as compared to lose five, six or seven electrons. Thus atoms with five, six or seven valance electrons form negative ions by gaining electrons.
Atoms with one, two or three valance electrons lose the electrons to get complete octet because it is more convenient for the atoms to lose one two or three electrons as compared to gain the seven, six or five electrons. The atoms with one, two or three valance electrons form positive ions.
Which action most likely causes large rocks to become smaller pieces of rock?
a. melting inside of Earth
b. weathering by wind and water
C. cementing by mud and minerals
d. being pressed between layers of soil
Answer:B
Explanation:
explain what gravity is in your own words
Answer:
the invisible force around the atmosphere that keeps us from floating all over the place
Explanation:
its the best I could come up with
Answer:
gravity is the thing keeping you down to earth keeping your head outta the clouds and your feet on the ground :)
Explanation:
