Answer:
40 KM an hour.
Explanation:
Answer:
40 KM an hour.
Explanation:
Why was it so important that the scientist investigating the atom be young and unattached to existing scientific thinking
Answer:
so they can find the aswer and not get hurt
Explanation:
The scientist Neil Bohr has investigated the atom to be young and unattached to Albert Einstein thinking because he is fearless of his thinking and ready to find an explanation.
What is Einstein model?Einstein model is called as Einstein solid model. He stated as ever solid atom oscillate with the same frequency and contain large number of three dimensional quantum harmonic oscillation.
Bohr atomic model stated that electron revolve around the nucleus in its stable orbital without emitting radiant energy. It is primitive model of hydrogen atom. Bohr has given the expression l = nh / 2π
Where n = principle quantum number, l = angular momentum and h = plank constant
Thus, the scientist Neil Bohr has investigated the atom to be young and unattached to Albert Einstein thinking because he is fearless of his thinking and ready to find an explanation.
To learn more about Einstein model, refer to the link below:
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Over the last 800,000 years before humans existed, CO2 levels in the atmosphere have stayed below ________ PPM. Today, CO2 levels are over ________ PPM.
fill in the blanks
What is the smallest unit of life that conducts all life functions?
A. cell
B. organelle
C. tissue
D. organ
Answer:
a: cells
Explanation:
just did it. your welcome have a nice day
answer :- The smallest unit of life that conducts all life function are cell
plz help thx brainliest btw :)
Answer:
1. earth metal 2. halogen 3.The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups. ... Elements in the periodic table are organized according to their properties.
Inventor: Dmitri Mendeleev please name most brainliest
How many moles of oxygen atoms (not
molecules) are present in 6.41×1025 molecules
of dinitrogen pentoxide (N2O5)?
1. 532 mol
2. 106 mol
3. 32 × 1025 mol
4. 266 mol
Answer:
532 moles of O atoms.
Explanation:
Given data:
Number of moles of oxygen atom present = ?
Number of molecules of N₂O₅= 6.41×10²⁵ molecules
Solution:
First of all we will calculate the number of moles of N₂O₅.
1 mole = 6.022×10²³ molecules
6.41×10²⁵ molecules × 1 mol /6.022×10²³ molecules
106.4 mol
Number of atoms of O:
1 mole of N₂O₅ contain 5 moles of O atoms.
106.4×5 = 532 mol
Ice cube trays hold about 350 grams of water. If the water comes out of the faucet at 37 degrees celcius, how much evergy do I have to remove to freeze the ice cubes?
Answer:
-171.79 KJ
Explanation:
We must keep in mind that water freezes at 0 degrees centigrade
Recall that heat lost during freezing can be obtained from;
H = mc(θ2 - θ1)
m = mass of the water = 350 g/1000 = 0.35 Kg
c = specific heat capacity of water = 4,200 J/kg°C
θ2 = final temperature = 0°C
θ1 = initial temperature = 37°C
H= 0.35 * 4,200 * (0 - 37)
H = -54390 J = -54.39 KJ
Energy given out when 1 mole of water freezes at its freezing point = -6.04 kJ
For 350 g of water; 350 g/18 g/mol * -6.04 kJ = -117.4 kJ
Hence total energy removed = (-54.39 KJ) + (-117.4 kJ) = -171.79 KJ
5. Dorji blows air into a red balloon and then squeezes out the air from it. Explain why it is a
physical change.
Answer:
This did not change the latex/composition of the balloon it just filled and went out.
Explanation:
Its the same way you fill a container without it being a chemical change.
i will mark brainlyiest
Answer:
Do you want someone to go through and answer all of these questions??
Explanation:
I am on the dox, but idk if I could finish it fast enough to put the link in here. Is there a way to delete answers?
be strong
Hey now, life is every minute
All or nothing
Living on the limits
Hey now, I will sing it loud and sing it strong
Let the echo decide if I was right or wrong
tie your shoe lace get prepared for a race
And a very few feel burn,
And the rest, they may live and learn!
but who knows the world hurts and theres different parts yeah be strong.
Nice written.
Is it written by you yourself or you have copied it from somewhere?
how many molecules of co2 in 97.3 grams of co2
Answer:
1.33 × 10²⁴ molecules CO₂
General Formulas and Concepts:
Chemistry - Stoichiometry
Reading a Periodic TableDimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
97.3 g CO₂
Step 2: Define conversions
Avogadro's Number
Molar Mass of C - 12.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of CO₂ - 12.01 + 2(16.00) = 44.01 g/mol
Step 3: Convert
[tex]97.3 \ g \ CO_2(\frac{1 \ mol \ CO_2}{44.01 \ g \ CO_2} )(\frac{6.022 \cdot 10^{23} \ molecules \ CO_2}{1 \ mol \ CO_2} )[/tex] = 1.33138 × 10²⁴ molecules CO₂
Step 4: Check
We are given 3 sig figs. Follow sig fig rules.
1.33138 × 10²⁴ molecules CO₂ ≈ 1.33 × 10²⁴ molecules CO₂
Which segment of this graph shows a decreasing velocity? F 80 D. El 60 Position (m) с B 20 10 20 30 40 50 60 70 80 90 100 Time (s) OA A to B B. B to C C. C to D D. D to E O E. E to F
A decrease in velocity occurs at point D to E in the given displacement - time graph.
What is velocity?Velocity is defined as the time rate of change of displacement with time. It is measured in meters per second.
A decrease in velocity occurs when there is a small change in displacement at a large amount of time.
Velocity from C to Dv = Δx/Δt
v = (60 - 40)/(60 - 40) = 1 m/s
Velocity from D to Ev = (60 - 60)/(80 - 60) = 0 m/s
Thus, a decrease in velocity occurs at point D to E in the given displacement - time graph.
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Biochemistry which studies the chemical composition, structure, and the reaction of compounds found in non-living organisms.
Select one:
True
False
The answer to this is true.
how many state of matter do we have
Answer:
3 we have three states of matter
Answer:
We have THREE (3) states of matter namely;
*Solid state
*Liquid state
*Gaseous state
What happens to air pressure as you move upward into the atmosphere?
it increases
it decreases
it remains constant or stays the same
it fluctuates and increases and decreases
Answer:
Pressure decreases with increasing altitude
Explanation:
At higher elevations, there are less air moecules.
Explanation:
The pressure exerted by the air in the atmosphere is greatest at Earth's surface and falls as altitude increases. The reason is that density and depth of the atmosphere are greatest at sea level and decline with increasing altitude.
where da fine shortys at follow da gram yfbg.jay
Answer:
no <3
Explanation:
Answer:
brody this aint the place for that daddy;)( no homo tho i aint with that gay stuff)
Explanation:
7th GRADE SCIENCE 25 POINTS I WILL GIVE BRAINLIEST INTERNAL AND EXTERNAL STIMULI IN PLANTS PLEASE LIST 5 EXAMPLES FOR INTERNAL AND 4 EXAMPLES FOR EXTERNAL HELLP PLEASEE ignore the 1st answer for external :)
Answer:
ok how about you answer my question, why would a moderator delete ALL of my answers to peoples questions?! now i have negatove points. smh
Explanation:
ugh sorry -_-
Answer:2.Plants have oxygen in them they also breathe oxygen and help the climate 3.there are all kinds of plants but the very first plant was a tree. 4. You might think plants are genetal normally they are but some types of plants can be very feisty such as the plant that eats stuff like actually opens it mouth some people think this is amazing and can lead to bigger things.! 5. Normally you see the pants normal size like little and pretty but there is enormous plants around the world that can get up to as big as a couch or bigger.
Explanation:
Sorry if I did bad lol
What is the oxidation number of an element?
A. The number of atoms of an element in a formula
B. The charge an element would have if it lost or gained electrons
C. The number of valence electrons an element has
D. The group number for the element
Answer:
The charge an element would have if it lost or gained electrons
a moist red litmus paper is used for testing ammonia gas ,why
A moist red litmus paper is used for testing ammonia gas because ammonia is a base which turns moist red litmus paper blue.
What is a base?According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.
Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.
They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.
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If 3.0 moles of hydrogen react, how many grams of nitrogen will be used? Round your answer to the nearest whole number. N2 + 3H2 -> 2NH3
Answer:
28g
Explanation:
Given parameters:
Number of moles of hydrogen = 3moles
Unknown:
Mass of nitrogen used = ?
Solution:
To solve this problem, let us establish the balanced reaction equation first;
N₂ + 3H₂ → 2NH₃
From the balanced reaction equation;
3 mole of H₂ will combine with 1 mole of N₂
Now,
Mass of Nitrogen = number of moles x molar mass
Molar mass of N₂ = 2(14) = 28g/mol
Mass of Nitrogen = 1 mole x 28g/mole = 28g
Why do elements form an ionic bond
Answer:
An ionic bond is formed when a metallic element and a non-metallic element form a compound.
Explanation:
As you may know, each atom contains a set amount of electrons. For example, Hydrogen has one electron, helium has two electrons, lithium has three electrons and so on.
Electrons come in shells. The first shell can hold 2 elections at most, and each shell past this point can hold 8 electrons. When an atom has a filled outer shell, it is considered stable. (This so why the noble gases are unreactive- they have a full outer shell of electrons.)
This is why compounds can form- it is the chemical bonding of 2 or more chemical elements: take NaCl, sodium chloride, or SO2, sulphur dioxide.
You specifically asked about ionic bonds. Ionic bonds, as expressed above, form between a compound of a metallic and non metallic element.
Let's take sodium chloride as an example. Sodium has 1 electron in its outer shell and chlorine has 7. Both need a full outer shell to become stable. Because of this, the sodium atom loses its only electron in its outer shell to become a sodium ion and the chlorine atom gains the electron to become a chlorine ion as well. Because of this, both ions have a full outer shell, rendering them stable.
Now, because the sodium ion is short of one electron, it has more protons than electrons, resulting in it having a positive charge. The chlorine ion is the opposite, having a negative charge.
Write 2.0 x 10^-3 in standard notation.
Answer:
2.3 * 1,000 = 2,300
Explanation:
Which of the following conditions most favors the process of dissolution?
In photosynthesis-
A. light energy is transformed into chemical energy
B. molecular energy is transformed into kinetic energy
C. chemical energy is transformed into light energy
D. light energy is transformed into heat energy
Answer:
A.
Explanation:
A chemical formula (such as H20) can be considered a type of model.
O True
O False
Answer:
it is false it cannot be a model
5. What, if anything, is wrong with the nuclear equation shown below?
Answer:
A
Explanation:
Hopefully this helps
What, if anything, is wrong with the nuclear equation shown below?
a. the daughter product has the wrong atomic number.
b. The daughter product has the wrong mass number.
c. The particle labeled "e" should have a mass number of 1.
d. There is nothing wrong with the equation.
Answer:
a. the daughter product has the wrong atomic number.
who is Aufabu? Is he a man ?
Answer: No, it is a rule. The aufbau principle, from the German Aufbauprinzip, also called the aufbau rule, states that in the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels. For example, the 1s subshell is filled before the 2s subshell is occupied.
Use the activity series below to predict whether the following reactions will take place. Activity series from most to least reactive: Upper F Subscript 2; Upper C l Subscript 2; Upper B r Subscript 2; Upper I Subscript 2. Cl2 + 2RbI → 2RbCl + I2 yes no I2 + NiBr2 → NiI2 + Br2 yes no
Cl2 + 2RbI → 2RbCl + I2 is possible while I2 + NiBr2 → NiI2 + Br2 is not possible.
It will do us a lot of good to write out the equations again;
Cl2 + 2RbI → 2RbCl + I2 Yes
I2 + NiBr2 → NiI2 + Br2 No
If we look at the reaction closely, they are displacement reactions. It is worthy to note that a specie can only displace another specie which lies below it in the activity series. The activity series is an arrangement of elements in order of decreasing reactivity.
The activity series of the halogens is; fluorine > chlorine > bromine > iodine.
Since chlorine is above iodine in the activity series, Cl2 + 2RbI → 2RbCl + I2 is possible.
Iodine is less than bromine in the activity series hence the reaction I2 + NiBr2 → NiI2 + Br2 is not possible.
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Answer:
Cl2 + 2RbI --> 2RbCl + I2 = yes
I2 + NiBr2 --> NiI2 + Br2 = no
Explanation:
I just took the assinment
help me (photo attached). I'll mark brainiest :O
Answer:
1. freshwater and marine.
2. Living parts of plants and animals
3. Only plants
4. Meats and plants
5. Meats
6. Other: (Anything they can find that's edible)
7. Break down dead plants and animals into nutrients
8. Prey
9. Rainfall
10. Deserts
Let me know if this helped! Have a nice day! Tell me if these are correct and if any are wrong!
The reusable booster rockets of the space shuttle use a mixture of aluminum and ammonium perchlorate as fuel. A possible reaction is
3Al (s) + 3NH4ClO4 (s) = Al2O3 (s) + AlCl3 (s) + 3NO (g) 6H2O (g)
Calculate the delta H for this reaction.
ΔH for this reaction : -2668.4 (exothermic)
Further explanationThe change in enthalpy in the formation of 1 mole of the elements is called enthalpy of formation
The enthalpy of formation measured in standard conditions (25 ° C, 1 atm) is called the standard enthalpy of formation (ΔHf °)
(ΔH) can be positive (endothermic = requires heat) or negative (exothermic = releasing heat)
The value of ° H ° can be calculated from the change in enthalpy of standard formation:
∆H ° rxn = ∑n ∆Hf ° (product) - ∑n ∆Hf ° (reactants)
you can search the value of ΔHf on the internet
∆H ° rxn =( ∆H Al₂O₃+∆H AlCl₃+3.∆H NO + 6.∆H H₂O)-(∆H Al+∆H NH₄ClO₄)
[tex]\tt \Delta H^o~rxn=(-1669.8+-704+(3\times 90.4)+(6.\times -241.8)-(3\times 0+3\times -295)\\\\\Delta H6o~rxn=-3553.4+885=-2668.4~kJ/mol[/tex]
23.73 g of some metal has a volume of 3.0mL.
Find this metals density.
Answer:
7.91 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question we have
[tex]density = \frac{23.73}{3.0} \\ [/tex]
We have the final answer as
7.91 g/mLHope this helps you