Answer:
see below
Explanation:
400 gm = 1000 gm (1/2)^n
.4 = (1/2)^n
n = 1.322 half lives = 7574.6 yrs
According to half life, 7574.6 years would it take a 1000 gram sample to decay to only 400 grams.
What is half life?Half -life of a substance is defined as the time which is required for half of the quantity of a radioactive substance to get decayed.It is a term which is used in nuclear chemistry for describing how quickly unstable atoms undergo radioactive decay into other nuclear species by emitting particles or the time which is required for number of disintegrations per second of radioactive material to decrease by one half of its initial value.
400 gm = 1000 gm (1/2)[tex]^n[/tex]
.4 = (1/2)[tex]^n[/tex]
n = 1.322 half lives = 7574.6 yrs.
Thus, 7574.6 years would it take a 1000 gram sample to decay to only 400 grams.
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A molecule that is _____ loses electrons, and a molecule that is _____ gains electrons. oxidized; reduced negative; positive reduced; oxidized weak; polar None of the other answer options is correct.
Answer:
Oxidized, and reduced
Explanation:
The acronym LEO, and GER may be helpful, or think of a specific example (such as a copper 2+ ion being reduced into copper).
Loose
Electron
Oxidization
Gain
Electron
Reduction
from this, we know that a molecule which looses electrons is being oxidized, and a molecule that gains electrons is being reduced.
name the covalent compound:
I8P
There are certain rules to follow when naming covalent compounds. But first, let us look at the definition of Covalent Compounds.
What are Covalent Compounds?
When covalent bonds aid the creation of a molecule, in which the atoms have at least one similar pair of valence electrons, a covalent compound is said to have been formed.
A very common example is water (H₂O)
How are Covalent Compounds named?
To name a covalent compound, simply list the first element in the formula using the name of the element, then name the second element by adding the suffix "ide" to the stem of the second element's name.
If there is only one atom in the molecule of the first element, then no prefix should be added.
It is to be noted that if the second element in the compound is oxygen, then we should say:
monoxide instead of monooxide andtrioxide instead of troxide, all depending on how many atoms that are involved.See the attached for the prefixes related to the various number of atoms in the compounds.
It is to be noted that the covalent compound to be named here is not stated hence the general answer.
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Where would you find ocean water with the most solar radiation?
Near the Equator
Near the South Pole
Near the Arctic Circle
Answer:
The answer is Near the Equator.
Explanation:
Its near africa and africa is near the equator.
Answer:
near the equator
Explanation:
took the quiz its right for me
According to the brønsted–lowry definition of acids-base reaction, acids have the ability to.
Answer:
gain, or accept, a hydrogen cation
Explanation:
Hope this helps! :)
A sample of CH3OH(g) is placed in the previously evacuated vessel with a pressure of P1 at 600 K. What is the final pressure in the vessel after the reaction is complete and the contents of the vessel are returned to 600 K
For a sample of CH3OH(g) is placed in the previously evacuated vessel with a pressure of P1 at 600 K, the final pressure in the vessel is
Pt=3P1
What is the final pressure in the vessel after the reaction is complete and the contents of the vessel are returned to 600 K?Generally, the Chemical reaction is given as
CH3OH----->CO +2H2
Therefore, The pressure P1 doubled at the product side of the reaction
In conclusion, the final pressure in the vessel at 600k
Pt=P1+P2
Pt=3P1
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Calculate the volume occupied by 56. 5 g of argon gas at stp.
Answer:
39.95 hope this helps
Explanation:
Which term describes this reaction?
O addition
O condensation
O elimination
O substitution
Answer:
addition
Explanation:
I really don't know why
Which of the following statements is correct for precipitation
reaction?
A. All the products must be insoluble.
B. At least one of the products is insoluble.
C. All the reactants must be insoluble.
D. At least one of the reactants must be insoluble.
Answer:
B. At least one of the products is insoluble.
Explanation:
Precipitation reaction :
A chemical reaction occurring in an aqueous solution where two ionic bonds combine, resulting in the formation of an insoluble salt. These insoluble salts formed in precipitation reactions are called precipitates.
A sample of 10.5g of Nirtogen reacts with 20.2g of Hydrogen to produce ammonia.
3H2(g)+N2(g)=2NH3(g)
a. What is the theoretical yield of ammonia?
b. What is the limiting reactant?
c. What is the excess reactant?
d. How much is the excess reactant?
e. If 4.1 g of ammonia is actually produced, what is the precent yield?
Answer:
Explanation:
a) The mass of the reactants is 10.5 + 20.2 = 30.7, so the theoretical yield of ammonia is also 30.7 grams (by the law of conservation of mass)
b) The gram-formula mass of diatomic nitrogen is about 28.014 g/mol, so 10.5 grams of nitrogen is 10.5/28.014 = 0.37 moles. In comparison, the gram-formula mass of diatomic hydrogen is about 2.016 g/mol, so 20.2 grams of hydrogen is about 20.2/2.016 = 10.0 moles. Dividing this by 3, we get 3.33 moles. So, nitrogen is the limiting reactant.
c) Hydrogen
d) 0.37 moles of nitrogen is consumed, so (0.37)(3) = 1.11 moles of hydrogen is consumed. This means that 3.33-1.11=2.22 moles of hydrogen are remaining, which has a mass of (2.22)(2.016)=4.47 grams.
e) (actual)/(theoretical) * 100 = (4.1)/(30.7) * 100 = 13%
Easy question
Who is the youngest in ateez
Answer: jongho
Explanation:
Answer:
Choi JongHo
Explanation:
I need help please help
Answer:
I don't know the help you are talking about.
An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity?
A. carbon
B. fluorine
C. nitrogen
D. oxygen
Which is best supported by the data in the chart
Answer:
B
Explanation:
Speed is defined as __________.
A) the change in position and direction over time
B) the change in acceleration over time
C) the change in velocity over time
D) the distance traveled over time
Answer:D)
Explanation: the distance traveled over time
When 20.00 mL of an unknown monoprotic acid is titrated with 0.125 M NaOH, it takes 15.00 mL to reach the endpoint. What is the molarity of the unknown acid?
Answer:
About 0.0940 M.
Explanation:
Recall that NaOH is a strong base, so it dissociates completely into Na⁺ and OH⁻ ions. Because the acid is monoprotic, we can represent it with HA. Thus, the reaction between HA and NaOH is:
[tex]\displaystyle \text{HA}_\text{(aq)} + \text{OH}^-_\text{(aq)} \longrightarrow \text{H$_2$O}_\text{($\ell$)} + \text{A}^-_\text{(aq)}[/tex]
Using the fact that it took 15.00 mL of NaOH to reach the endpoint, determine the number of HA that was reacted with:
[tex]\displaystyle \begin{aligned} 15.00\text{ mL} &\cdot \frac{0.125\text{ mol NaOH}}{1\text{ L}} \cdot \frac{1\text{ L}}{1000\text{ mL}} \\ \\ &\cdot \frac{1\text{ mol OH}^-}{1\text{ mol NaOH}} \cdot \frac{1\text{ mol HA}}{1\text{ mol OH}^-}\\ \\ & = 0.00188\text{ mol HA}\end{aligned}[/tex]
Therefore, the molarity of the original solution was:
[tex]\displaystyle \left[ \text{HA}\right] = \frac{0.00188\text{ mol}}{20.00\text{ mL}} \cdot \frac{1000\text{ mL}}{1\text{ L}} = 0.0940\text{ M}[/tex]
In conclusion, the molarity of the unknown acid is about 0.0940 M.
What type of heat transfer does not need to travel through matter?.
I have 0.445 L of a 1.8 M NaCl solution. If I boil away some water until the volume of the solution reaches 0.250 L, what will the new molarity of the solution become?
Answer:
3.2 M
Explanation:
M1V1=M2V2
1.8*.445=.801
.801/.25=3.204
Molarity = M2 = 3.2 M
.How many grams of NaCl required to form a 500ml solution with a molarity of 0.5M , the molar mass of NaCl is 58.5g/mol?
What two layers in the atmosphere protect us?
Answer:
The Stratosphere and Troposphere
Answer:
trophosphere and stratosphere protect us from ozone rays
Explanation:
How/why do acids and bases different from weak acids and bases?
Answer:
Weak acids and bases are less than 100% ionized in aqueous solution
Explanation:
hope this helps
pls mark brainliest
2.00 L of 0.800 M NaNO3 must be prepared from a solution known to be 2.50 M in concentration.How many mL are required? Plus don't send me virus links!!!! pls explain how to do it
Answer:
1.36 × 10³ mL of water.
Explanation:
We can utilize the dilution equation. Recall that:
[tex]\displaystyle M_1V_1= M_2V_2[/tex]
Where M represents molarity and V represents volume.
Let the initial concentration and unknown volume be M₁ and V₁, respectively. Let the final concentration and required volume be M₂ and V₂, respectively. Solve for V₁:
[tex]\displaystyle \begin{aligned} (2.50\text{ M})V_1 &= (0.800\text{ M})(2.00\text{ L}) \\ \\ V_1 & = 0.640\text{ L} \end{aligned}[/tex]
Therefore, we can begin with 0.640 L of the 2.50 M solution and add enough distilled water to dilute the solution to 2.00 L. The required amount of water is thus:
[tex]\displaystyle 2.00\text{ L} - 0.640\text{ L} = 1.36\text{ L}[/tex]
Convert this value to mL:
[tex]\displaystyle 1.36\text{ L} \cdot \frac{1000\text{ mL}}{1\text{ L}} = 1.36\times 10^3\text{ mL}[/tex]
Therefore, about 1.36 × 10³ mL of water need to be added to the 2.50 M solution.
An aqueous solution has 124 g of a salt dissolved in 1000 g of solution. What is the concentration of the salt in units of %?
Answer: 12.4%
Explanation:
124/1000 * 100 = 12.4%
According to the concept of percent solution,the concentration of salt in percent units is 12.4 %.
What is percent solution?Percent solution is defined as a convenient way to record concentration of solution.It is a expression which relates solute to solvent as,mass of solute/mass of solution ×100.There are two types of percentage solutions percent weight by volume and percent volume by volume .Advantages of using percent solutions is that molecular weight of compound is not required.
Percent solutions are of important use in industries and laboratories for measuring concentration of solutions.
In the given example, percent concentration is found out as, mass of solute/ mass of solution ×100 thus substitution of values gives 124/1000×100=12.4%.
Thus, the percent concentration is 12.4%.
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________ can be made in small amounts by creating a chemical reaction through the mixing of pseudoephedrine with regular household items.
Synthetic cathinone can be made in small amounts by creating a chemical reaction through the mixing of pseudoephedrine with regular household items.
What is cathinone?Cathinone is an alkaloid drug obtained from a shrub plant (Catha edulis) and is equivalent to Akovaz (ephedrine).
The cathinone can also be artificially designed by using a pseudoephedrine medical drug.
Synthetic cathinone can be artificially produced in order to obtain this substance for medical use.
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A balloon that can hold 85 L of air is inflated with 3.5 moles of gas at a pressure of 1.0 atmosphere. What is the temperature of the balloon?
Answer:
295.96 K ( = 22.81 degrees C)
Explanation:
PV = n RT R = .082057 L-Atm / (K-Mol) n = 3.5 P = 1 atm V = 85 liters
(1)(85) = 3.5 (.082057)(T)
solve for T = 295.96 K
a. Two possible Lewis electron-dot diagrams for CO2 are shown above. Explain in terms of formal charges why diagram Z is the better diagram.
b. Identify the hybridization of the valence orbitals of the C atom in the CO2 molecule represented in diagram Z.
The carbon atom is SP hybridized while the oxygen atom is SP2 hybrized.
What are resonance structures?The term resonance structures are those structures that can be used to explain the bonding in a molecule. Sometimes, a single structure is insufficient in explaining the structure of a compound.
Now looking at the two sturctures, Z is better because there are mo formal charges which make the molecle less stable unlike in X. In the CO2 molecule, the carbon atom is SP hybridized while the oxygen atom is SP2 hybrized.
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2. How many grams of CaCl₂ are needed to prepare 125 mL of a 2.00 M solution of aqueous CaCl₂(aq)?
(M, molarity)
Answer:
The solution contains 0.50 mol or 55 g of CaCl2.
Explanation:
how many sulfer is in h2s
Answer:
H2S is a hydride of sulfur while SO2 is an oxide of sulfur.
Explanation:
what is the molarity of a solution that contains 1.25 moles of K2SO4 dissolved into water to make 1.5 liters of solution?
Answer: 0.8 M
Explanation:
molarity = (moles of solute)/(liters of solution) = 1.25/1.5 = 0.8 M
8) F2(g) + CaBr2(g) -> CaF2(g) + Brz(g)
What type of reaction is shown above?
A) synthesis
B) decomposition
C) single replacement
D) double replacement
2C₂H₂(g) + 5O₂(g) —> 4CO₂(g) +2H₂O(g)
b. How many moles of H₂O are produced when 64.0g C₂H₂ burns in oxygen?