Answer: a)neptunium b) the element is unstable
Explanation:
a) 238 0 239 -1
U + n = Np e
92 1 93 0
b) it is an isotope of neptunium with half-lives less than 4.5 days, with most less than 50 minutes. It is therefore not stable that's why they where unable to identify it
Calculate the mass of NaOH
required to prepare a 0.343M
solution dissolved in 2500mL
of water.
Answer:
will this work or help?
Explanation:
Calculate the mass of NaOH required to prepare a 0.343 M solution dissolved in 2500 mL of water. 0.343 M = x mol / 2.5 L = 0.86 mol 0.86.
WILL MARK BRAINLIEST!!!!
How many moles are there in 993.6 grams of potassium sulfate (K2SO4)?
Answer:
5.702 mol K₂SO₄
General Formulas and Concepts:
Atomic Structure
Reading a Periodic TableCompoundsMolesStoichiometry
Using Dimensional AnalysisExplanation:
Step 1: Define
[Given] 993.6 g K₂SO₄
[Solve] moles K₂SO₄
Step 2: Identify Conversions
[PT] Molar Mass of K: 39.10 g/mol
[PT] Molar Mass of S: 32.07 g/mol
[PT] Molar mass of O: 16.00 g/mol
Molar Mass of K₂SO₄: 2(39.10) + 32.07 + 4(16.00) = 174.27 g/mol
Step 3: Convert
[DA] Set up: [tex]\displaystyle 993.6 \ g \ K_2SO_4(\frac{1 \ mol \ K_2SO_4}{174.27 \ g \ K_2SO_4})[/tex][DA] Divide [Cancel out units]: [tex]\displaystyle 5.7015 \ mol \ K_2SO_4[/tex]Step 4: Check
Follow sig fig rules and round. We are given 4 sig figs.
5.7015 mol K₂SO₄ ≈ 5.702 mol K₂SO₄
If the pressure in a gas cylinder is heated to 354.2 K with the pressure of 2.64 atm that was the initial temperature if the initial pressure was 1.25 atm
Answer:
Initial temperature of the gas cylinder was 167.7K
Explanation:
Based on Gay-Lussac's law, the pressure of a gas under constant volume is directly proportional to its absolute temperature. The equation is:
P1*T2 = P2*T1
Where P is pressure and T absolute temperature of 1, initial state and 2, final state of the gas.
Replacing:
P1 = 1.25atm
T2 = 354.2K
P2 = 2.64atm
T1 = ?
1.25atm*354.2K = 2.64atm*T1
167.7K = T1
Initial temperature of the gas cylinder was 167.7KA large pile of marbles weigh 592.45g. 15 marbles weigh 43.35 g. How
many marbles are in the large pile
Answer:
205 marbles.
Explanation:
Hello there!
In this case, according to the given information in this problem, it is possible for us to realize that the weight of 15 marbles is 43.35 g and the idea is to calculate the number of marbles in 592.45 g, so we can use the following setup:
[tex]\frac{15marbles}{43.35g} =\frac{x}{592.45g}[/tex]
And we solve for x as follows:
[tex]x=\frac{15marbles*592.45g}{43.35g} \\\\x=205marbles[/tex]
Regards!
20 mL of hydrogen measured at 15° C is heated to 35°C.
What is the new volume at the same pressure?
V2 = 21.4 ml
Explanation:
Note: When dealing with gases, make sure that you change the units from °C to K.
T1 = 15°C + 273 = 288K
T2 = 35°C + 273 = 308K
V1 = 20 ml
V2 = ?
We use Charles's law to solve V2:
V1/T1 = V2/T2
or
V2 = (T2/T1)V1
= (308K/288K)(20 ml)
= 21.4 ml
What is one question I would ask from conducting a research on inhalants?
__________________ are high-speed bands of winds occurring at the top of the tropsophere.
Your answer:
Doldrums
Horse Latitudes
Jet Streams
Trade Winds
Answer:
jet streams
Explanation:
THE JET STREAM Narrow bands of exceedingly high speed winds are known to exist in the higher levels of the atmosphere at altitudes ranging from 20,000 to 40,000 feet or more. They are known as jet streams.
Fusion reactions power the _____ in space. Humans currently use fusion in _____ , but researchers are seeking more applications.
Answer:
Sun and the stars, nothing humans don't use fusion at all
Explanation:
Nuclear fusion reactions power the sun in space. Humans currently use fusion in nuclear weapons by means of nuclear reactions, but researchers are seeking more applications.
What are nuclear reactions?There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus respectively.
In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.
In nuclear fusion,on the other hand, is a reaction which occurs when two or more atoms combine to form a heavy nucleus.Large amount of energy is released in the process which is greater than that of the energy which is released in nuclear fission process.
Learn more about nuclear reactions,here:
https://brainly.com/question/12649087
#SPJ7
18. How many grams are in 563 mL of chlorine gas at STP?
Answer:
[tex]at \: stp : \\ 22400 \: ml \: are \: occupied \: by \: 71 \: g \: of \: chlorine \\ 563 \: ml \: will \: be \: occupied \: by \: ( \frac{563}{22400} \times 71) \:g \\ = 1.78 \: g[/tex]
Which pollution effects the environment the most?
A. air pollution
B. water pollution
C. land pollution (ex. throwing trash in nature)
D. Noise pollution
Answer:
Air pollution effect the most
ANSWER :
A. air pollutionExtra Information :
❥ Air pollution can damage crops and trees in a variety of ways.
❥ Ground-level ozone can lead to reductions in agricultural crop and commercial forest yields, reduced growth and survivability of tree seedlings, and increased plant susceptibility to disease, pests and other environmental stresses (such as harsh weather).
Hope it helps ya...!!♡
MgCl2 + NaOH → Mg(OH)2 +Naci
Balance
Consider the following reaction:
CH3COOH + H2O CH3COO- + H3O+
A buffer solution is prepared by adding NaCH3COO(s) to CH3COOH(aq). What happens to the equilibrium when a few drops of NaOH solution are added to the buffer?
A. It shifts left and [CH3COO-] increases.
B. It shifts left and [CH3COO-] decreases.
C. It shifts right and [CH3COO-] increases.
D. It shifts right and [CH3COO-] decreases.
Answer:
I would say:
C. It shifts right and [CH3COO-] increases.
Explanation:
I am uncertain, but since NaOH is basic I think it should shift right.
hope this helps though
A river, such as the one in the diagram, receives pollution from all the different sources shown. The types of pollutants and the amounts that enter the river will be different, but all the sources contribute to pollution of this freshwater.
. Which sources of pollution are point sources?
A. factories, cropland
B. wastewater treatment plants, factories
C. urban streets, suburban development
D. urban streets, suburban development, rural homes, cropland, animal feedlot
Answer:
A. factories, cropland
Explanation:
The point sources are identified as the sources of water pollution such as dirty drains and other sources of discharge. Factors and sewage treatment plants are sources of discharge and are the two most common points.What volume of 15.9 M Nitric acid would be required to make 7.2 L of 6.00 M nitric acid? (hint: dilution problem) will mark brainliest if correct
a. 2.72 L
b. 686.88 L
c. .075 L
d. 272
Answer:
d
Explanation:
What did Paul Krebaum find through his research of hydrogen sulfide (H2S)? Explain using oxidation states of sulfur.
Answer:
Paul Krebaum was an Engineer who was involved in various experiments and occasionally had to deal with Sulphuric compounds which led to the release of sulphur.
Sulphur has an unpleasant smell and he didn’t like that. He later found out through a book that Hydrogen peroxide was a compound which oxidized Sulphur.This also reduced the smell and noticed our nose are more sensitive to sulphur in a high oxidation state than the lower state.
Een luipaardgekko weegt gemiddeld 100 g, figuur 7.33.
c Denk je dat de gekko als hij 60 kg weegt in plaats van
100 g even gemakkelijk over het plafond kan lopen?
Answer:
english?
Explanation:
Circle the solution with the highest concentration
a. 5.0M
c. 0.6M
b. 1.0M
d. 0.75M
Answer:
answer is option a..............
What is the molarity of a 1.283 L solution that is made from 16.88 g of NaCl?
Answer in units of M.
Answer:
0.225M
Explanation:
Equation: M=n/v
n = moles of solute
v = liters of solution
NaCl = 58.443 g/mol
16.88/58.443= 0.289 moles of NaCl
0.289/1.283=0.225M
4. Balance the following chemical equation. Say what the coefficients "a"
and "b" are
2 Fe2O3 + 3 C → a Fe + b CO2
Answer:
a = 4
b = 3
Explanation:
SOLUTION :-
Balance it by using 'hit & trial' method , and you'll get the answer :-
2Fe₂O + 3C → 4Fe + 3CO₂
⇒ a = 4 ; b = 3
VERIFICATION :-
In reactant side of equation :-
Number of atoms in Fe = 2×2 = 4Number of atoms in O = 2×3 = 6Number of atoms in C = 3×1 = 3In product side of equation :-
Number of atoms in Fe = 4×1 = 4Number of atoms in C = 3×1 = 3Number of atoms in O = 3×2 = 6Number of atoms of each element is equal in both reactant & product side of equation. Hence , the equation is balanced.
Which equation represents conservation of charge? 1 + 2e → 12 2 21° 12 +2e 3 Br2 → 2Br + 2e Br + 2e Br
*With explanation
Answer:
Question is tough
Explanation:
I don't know sorry dude
Answer:2l- —> l2 + 2e
Explanation:
A 125 ml sample of gas is at STP how many moles of gas are in the sample
Answer:
5.58*10⁻³ moles of gas are in the sample.
Explanation:
The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Being 1000 mL equivalent to 1 L, then 125 mL is equal to 0.125 L. Then you can apply the following rule of three: if by STP conditions 22.4 L are occupied by 1 mole, 0.125 L are occupied by how many moles?
[tex]amount of moles=\frac{0.125 L*1 mole}{22.4 L}[/tex]
aomunt of moles= 5.58*10⁻³ moles
5.58*10⁻³ moles of gas are in the sample.
Answer:
5.58×10⁻³ moles of gas
Explanation:
There is a rule that says, that 1 mol of any gas, at STP is contained at 22.4L of volume.
We can apply a conversion factor
0.125 L . 1 mol / 22.4 L = 5.58×10⁻³ moles
Notice we converted volume from mL to L
We can also aply the Ideal Gases Law.
At STP we have 1 atm of pressure and 273.15K of T°
We replace data: 0.125 L . 1 atm = n . 0.082 . 273.15K
(0.125 L . 1 atm) / (0.082 . 273.15 K) = n
n = 5.58×10⁻³ moles
You have a block of wood with a mass of 700 grams and a volume of 1100 cm.
What is the density of wood?
5g metal Zinc reacts with hydrochloric acid to form hydrogen gas. What is the balanced chemical equation to represent the reaction
Answer:
Zn (s) + HCl (aq) → ZnCl₂ (aq) + H₂ (g) ↑
Explanation:
Let's define the reactants:
Zn (s)
HCl (aq)
One of the product is: H₂ (g)
This reaction can also produce ZnCl₂ (s)
Let's make the reaction:
Zn (s) + HCl (aq) → ZnCl₂ (aq) + H₂ (g) ↑
Notice that the the hydrogen gas is released from the tube, that's why the up arrow.
This is a redox reaction because the Zn and H chage their oxidation states.
Zn ⇄ Zn²⁺ + 2e⁻ Oxidation (it released two electrons)
Oxidation state is increased
2H⁺ + 2e⁻ → H₂ Reduction (It gained two electrons)
Oxidation state is decreased
The oxidation state of elements at ground state is 0
Jane has a weight of 500 N. The area of her two feet is 250 cm2. The pressure when she is standing is Pressure = 500/250 = 2 N/cm2.Jane wears stiletto heels. The area of one stiletto heel is 2 cm2. Calculate the pressure on the floor when Jane puts all her weight on one heel. Show your working.
Explanation:
pressure=force/area
pressure=500/2
pressure=250N/cm²
What is the molarity of 15.0 milliliters of an unknown acid that is titrated
with a 1.25 M NaOH solution and required 24.65 milliliters of base to
complete the titration?
Answer:
~2.054M
Explanation:
In this question ,I am going to assume that the acid is monoprotic acid(contains only one hydrogen) which I'll represent by HA.
Chemical equation:
NaOH(aq) + HA(aq)----->NaA(aq) + H2O(l)
The mole ratio of NaOH:HA is 1:1
1.25M NaOH=1.25 Moles/L or 1.25 moles /1000ml of NaOH
(1.25 moles /1000ml) x (24.65ml)=0.0308125 moles NaOH
Mole ratio is 1:1
So, moles of HA are also 0.0308125 moles
volume of HA =15ml
To find molarity of HA:
=(0.0308125 moles x 1000ml)/(15ml)
~2.054M of HA
~Hope it helps:)
Perform the following
mathematical operation, and
report the answer to the
appropriate number of
significant figures.
4.7257 - 3.12 = [?]
Answer:
1.61
Explanation:
I got this answer from a calculator and it's correct.
If the imaginary element Blobbium (Bb) formed an acid with the formula H₃Bb, what should this acid be named? *
Blobbic Acid
Blobbous Acid
Hydroblobbic Acid
Hydroblobbous Acid
Answer:
C
Explanation:
The non metal in HCl is Chlorine and the name of the acid is Hydrochloric acid.
H = hydro
Cl = chloric
So I imagine this new acid, yet to be discovered even by the crew of the Star Ship enterprise, would be
HydroBlobbic acid
I await news from Spock on how things are going on the discovery of such a thing. So far he has not said anything about it.
Match the correct prefixes with the correct numbers.
Kilo=
Hecto =
Deca=
Base Unit=
Deci=
Centi=
Milli=
100 | 0.1 | 0.001 | 10 | 1 | 1.000 | 0.01 |
Answer:
See explanation.
Explanation:
Kilo = 1000
Hecto = 100
Deca = 10
Base Unit = 1
Deci = 10
Centi = 100
Milli = 1000
What will the volume be of a soltuion created using 120 ml of 4.5 M stock solution if the final molarity needs to be 2.00 M
Answer:
We need 540 mmoles of stock solution and complete to 270 mL of volume.
Explanation:
In order to determine the volume or concentration at diluted solution we apply this formula:
Dil volume . Dil concentration = Conc volume . Conc concentration
Stock solution is always, the concentrated.
Let's replace with data given:
Dil. volume . 2 M = 120 mL . 4.5 M
Diluted volume = (120 mL . 4.5M) / 2M
Diluted volume = 270 mL
This problem can be also solved by rule of three:
1 mL of stock solution contains 4.5 mmoles
120 mL of stock solution contain (120 mL . 4.5 mmoles) / 1mL = 540 mmoles
This mmoles of stock solution are also contained at the diluted
If 2 mmoles are contained in 1mL of diluted solution
540 mmoles must be contained in (540 mmol . 1 mL) / 2 mmol = 270 mL
We need 540 mmoles of stock solution and complete to 270 mL of volume.
Who has played Amoung us and a stranger got ur number or location on there?
Yep, it happened to me