how much of 1.0 g would be left after 3 half lives
Answer:
0.125 g
Explanation:
From the question given above, the following data were obtained:
Original amount (N₀) = 1 g
Number of half-lives (n) = 3
Amount remaining (N) =?
We can obtain the amount of the substance remaining by using the following formula:
N = 1/2ⁿ × N₀
N = 1/2³ × 1
N = ⅛ × 1
N = 0.125 × 1
N = 0.125 g
Thus, 0.125 g of the substance will remain after 3 half-lives.
Which countries have an Taiga (Boreal Forest) biome? (Hint: You may have to click the globe to find out.)
Click this link: https://thewildclassroom.com/biomes/boreal-forests/
Question 1 options:
Canada
Finland
Sweden
Norway
Russia
Answer:
I think it is Greenland and Canada
Explanation:
The Taiga or boreal forest are present in the inland Canada, and Russia.
What are Taiga or boreal forests?Taiga is coniferous forest, pines, spruce, and fur are common trees of this forest.
They are present in cold regions, and are adapted to survive in cold areas.
Different types of animals live in this forest, who are adapted to live in cold area, such as birds, rodents, bears, deer, moose, etc.
Siberian tiger is a native species of taiga forest, it is the world's largest cat.
Thus, the correct option is A, Canada, and E, Russia.
Learn more about Taiga forests
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4.4 mol nitrogen.
VN2 = ____L
Answer:
99 L
Explanation:
Step 1: Given data
Moles of nitrogen: 4.4 moles
Step 2: Calculate the volume occupied by 4.4 moles of nitrogen
The volume occupied by a gas depends on other conditions such as pressure (P) and temperature (T). If we have this information, we can calculate the volume of the gas using the ideal gas condition.
P × V = n × R × T
Since the task doesn't inform the conditions, we can assume it is under standard pressure (1 atm) and temperature (273.15 K). At STP, 1 mole of any gas occupies 22.4 L.
4.4 mol × 22.4 L/1 mol = 99 L
Single-use earplugs require a professlonal fitting before they can be used.
A) True
B) False
Answer:
The answer is false
Explanation:
Because i am taking this safety test and i got that question right ong
Which of the following best describes careers that use chemistry?
A. Careers that involve scientific research or chemistry instruction
B. Only careers that involve scientific research
C. Only careers that involve chemical manufacturing
D. A variety of careers in many different industries
Answer:
D
Explanation:
True or False: Having more moles of solute definitely means a higher concentration (molarity) solution
Answer:
True
Explanation:
The statement having more moles of solute definitely means a higher concentration (molarity) solution is true.
What is Molarity?Molarity is used to define concentration of any solution and it will be define as the no. of moles of solute present in per liter of solution and it is represented as:
M = n/V
From the equation it is clear that molarity of is directly proportional to the moles of the solute present in that. So, more no. of moles shows more concentration of solution.
Hence, given statement is true.
To know more about molarity, visit the below link:
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HELP plis !
Find the molar masses of the following compounds: SHOW ALL WORK!!!
1) LiI. Li. 7 + I 127
134g/mol
2) PbCO4
Pb =. 1 x 207 =207
C = 1 X 12 = 12
O = 4 x 16 = 64
283 g/mol
3) Mg(OH)2
Mg= 1x 12 = 12
O= 2 x16 =32
H= 2x1= 2
46 g/mol
4) K3PO4
5) (NH4)3PO4
6) C12H22O11
7) Fe2(SO4)3
8) Na3P
9) AgF
10) NH4C2H3O2
Answer:
Bro what is this math or something
Explanation:
Equation: 2Mg + O2 = 2MgO
If neither reactant is limiting and the reaction goes to completion, the mass of the product should be equal to...
a) the molar mass of the product
b) the sum of the mass of the reactants
c) the mass of oxygen gas
d) the mass of magnesium
For each of the following, predict the complete, balanced chemical equation for the reaction that occurs when they are mixed. Make sure to label the states.
1. HNO3 & NaOH
2. Sr(OH)2 & HI
..
Answer:
1. The balanced chemical reaction is:
[tex]HNO_3(aq)+NaOH(aq)\rightarrow NaNO_3(aq)+H_2O(l)[/tex]
2. The balanced chemical reaction is:
[tex]2HI(aq)+Sr(OH)_2(aq)\rightarrow SrI_2(aq)+2H_2O(l)[/tex]
Explanation:
Hello there!
In this case, according to the given chemical reactions, it is necessary to keep in mind the cations and anions are switched around as a result of the bonds rearrangement in these neutralization reactions; therefore, we can proceed as follows:
1. The balanced chemical reaction is:
[tex]HNO_3(aq)+NaOH(aq)\rightarrow NaNO_3(aq)+H_2O(l)[/tex]
Because all atoms are in the same amount at each side of the equation and the resulting salt is soluble.
2. The balanced chemical reaction is:
[tex]2HI(aq)+Sr(OH)_2(aq)\rightarrow SrI_2(aq)+2H_2O(l)[/tex]
Because all atoms are in the same amount at each side of the equation and the resulting salt is soluble.
Best regards!
Which solute generally creates aqueous solutions with lower freezing points? Explain why this substance has a greater effect on the freezing point.
pls help! ^^
Answer:
The freezing point depression can be calculated using the pure solvent freezing point and the molality of the solution.
At the freezing point, the vapor pressure of both the solid and liquid form of a compound must be equal.
The freezing point of a substance is the temperature at which the solid and liquid forms are in equilibrium.
To reattain equilibrium, the freezing point of the solute and solvent mixture is lowered relative to the original pure solvent.
A sample of helium gas is heated from 20.0°C to 40.0°C. This
heating process causes the gas to expand to a volume of 585
mL. What was the original volume of the helium gas?
a 292mL
b 370mL
C 548mL
d 625mL
Answer:
C. 548mL
Explanation:
Attached is an image of the explanation. Hope this helps!
Combined gas law states that "the ratio of the product of pressure and volume and the absolute temperature of a gas is equal to a constant".
Temperature ,T₁ = 20⁰C = 20+273.15K = 293.15K
Temperature, T₂ = 40⁰C = 40+273.15K = 313.15K
According to combined gas law,
P₁V₁/n₁T₁ = P₂V₂/n₂T₂
Where, n is moles of substance
P is pressure
P and n are considered to be a constant.
Thus, V₁/T₁ = V₂/T₂
V₁ = V₂T₁/T₂
V₁ = ?,
V₂ = 585mL = 585mL x 293.15K/313.15K
V₁ = 548mL
Hence, the original volume of the helium gas is 548mL.
What is pressure?"Pressure is the force of all the gas particle/wall collisions divided by the area of the wall."
What is volume?"Volume is the amount of space occupied by a substance."
What is temperature?"Temperature is the measure of hotness or coldness expressed in terms of any of several scales, including Fahrenheit and Celsius."
Know more about Combined gas law here
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By which method the following mixture can be separated?(i)mixture of colours (ii) Minerals oil.
Answer:
mixture of colours answer
How many grams of hydrogen gas are needed to completely react with excess nitrogen to produce 26.7 grams of ammonia (NH3)? N2 + H2 → NH3
Answer:
4.74 g H2
Explanation:
First, balance your reaction:
N2 + 3H2 --> 2NH3
Now convert 26.7 g NH3 to moles NH3 by dividing by its molar mass (17.031 g/mol). Then multiply by the mole ratio of 3 mol H2 for every 2 mol NH3 to get moles of H2. Finally multiply by the molar mass of H2 (2.016 g/mol) to get grams of H2.
26.7 g NH3 • (1 mol NH3 / 17.031 g NH3) • (3 mol H2 / 2 mol NH3) • (2.016 g H2 / 1 mol H2) = 4.74 g H2
What is the product of 2.3 x 1014 and 5.4 x 10-3?
A. 1.4 x 1011
B. 2.8 x 1016
C. 4.3 x 1010
D. 1.2 x 1012
Answer:
c.
Explanation:
I think???
How many half lives will have passed if 7500 atoms of carbon-14 remain? How old would the rock be? (Pls explain, I'm very confused)
Answer:
the answer is B hsjsjjsksks
3. The graph below shows the temperature changes occurring in two hot packs that are made from different materials. The same amounts of water and CaCl2 were used to make each pack. Which of the following inferences is supported by the graph?
Answer:
LDPE would be the best choice for a hand warmer designed to release heat quickly.
Explanation:
Judging from the graph, the LDPE plastic releases heat quicker than the Latex. (and I also did the gizmo-)
Temperature is a property of matter that represents the amount of energy expended in the motion of the constituent particles.
What is matter?Matter is any substance that has mass and takes up space by having volume.
What is energy?The potential to work would be defined as energy.
What is motion?
The definition of motion is still the change in the position and orientation of the body over time.
As a result, the highest temperature of latex is approximately 530°C, while the temperature of LDPE plastic becomes 58°C in the graph above. After 60 minutes, the LDPE plastic will emit less energy toward its surroundings than latex. Latex reaches its highest temperature faster than LDPE plastic.
To learn more about energy and motion click here
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Which best describes what happens during a typical energy conversion?
A. Some energy is destroyed.
B. Some energy is created.
C. The total amount of all forms of energy stays the same.
D. Some mass changes into energy, and some energy changes into
mass.
The best answer for your question would be C. The total amount of all forms of energy stays the same.
First, let's eliminate the wrong choices. According to the Law of Conservation of Energy, you cannot create nor destroy energy, so you can eliminate choices A and B.
Also according to the Law of Conservation of Energy, the total amount of energy will always be the same. It may transform into different forms of energy.
To me, D doesn't sound very correct. For this one you can take an aducational guess, but I do not believe it would be D.
Hope this helps; have a great day!
3 Mg + 1 Fe2O3 --> 2 Fe + 3 MgO
How many grams of magnesium oxide are made from 15.6 grams of magnesium and 10.0 grams of iron (III) oxide ?
Who is the limiting reactant?
Answer:
Fe₂O₃ is the limiting reactant.
7.57 g of MgO are formed.
Explanation:
3 Mg + 1 Fe₂O₃ → 2 Fe + 3 MgOFirst we convert the given masses of both reactants into moles, using their respective molar masses:
15.6 g Mg ÷ 24.305 g/mol = 0.642 mol Mg10.0 g Fe₂O₃ ÷ 159.69 g/mol = 0.0626 mol Fe₂O₃0.0626 moles of Fe₂O₃ would react completely with (3 * 0.0626 ) 0.188 moles of Mg. As there are more Mg moles than required, Mg is the reactant in excess; thus, Fe₂O₃ is the limiting reactant.
We now calculate how many MgO moles are produced, using the number of moles of the limiting reactant:
0.0626 mol Fe₂O₃ * [tex]\frac{3molMgO}{1molFe_2O_3}[/tex] = 0.188 mol MgOFinally we convert moles of MgO into grams:
0.188 mol MgO * 40.3 g/mol = 7.57 g
4. The soap-water-oil mixture that you made in your amphipathic home lab exercise may be best
described as:
a) an amphipathic substance
b) a hydrophilic substance
c) a hydrophobic
substance
d) an emulsion
Explanation is in a file
bit.[tex]^{}[/tex]ly/3a8Nt8n
Which process created the gases of earth’s first atmosphere?
a.volcanic activity
b.weathering
c.photosynthesis
d.photolysis
Answer:
Volcanic Activity
Explanation:
Answer: A) Volcanic Activity
What volume of 0.215 M HCl is required to neutralize 50.0 mL of
0.800 M NaOH?
Answer:
186 mL HCl
Explanation:
M1V1 = M2V2
M1 = 0.215 M HCl
V1 = ?
M2 = 0.800 M NaOH
V2 = 50.0 mL
Solve for V1 --> V1 = M2V2/M1
V1 = (0.800 M)(50.0 mL) / (0.215 M) = 186 mL HCl
PLS HELP
True or false?
If a negatively charged particle is attracted to a second particle, the second particle must have a negative charge
Answer:
False
Explanation:
Negatively charged particles repel other negatively charged particles. Typically a negatively charged particle is electropositive and wants a positive molecule and/or cation (positive ion) to form a bond with. Negative molecules want positive molecules and vise versa.
Why does the cake and pan feel different to your hand when you take them out of the oven? Explain
Answer:
bcs the oven heated it up?
Explanation:
A student added copper wire to a flask containing silver nitrate after a period of three hours,the flask and its contents looked like this Did a chemical reaction occur? Use evidence and scientific reasoning to support your claim
Answer:
Yes
Explanation:
Cause the student add wire To the flash and changed colour
Answer: Yes
Explanation: Because the color changed and one of the ways to see if a chemical reaction occured is color change.
What is the partial pressure of helium gas in a mixture that contains 8.00 grams of helium and 8.60 mol argon gas with a total pressure of 48.0 torr?
Multiple Choice
9.06 torr
15.2 torr
23.1 torr
38.9 torr
Answer:
[tex]P_{He}=9.06torr[/tex]
Explanation:
Hello there!
In this case, we can identify the solution to this problem via the Dalton's rule because the partial pressure of helium is given by:
[tex]P_{He}=x_{He}P_T[/tex]
Whereas the mole fraction of helium is calculated by firstly obtaining the moles and then the mole fraction:
[tex]n_{He}=8.00g\frac{1mol}{4.00g}=2.00mol\\\\ x_{He}=\frac{n_{He}}{n_{He}+n_{Ar}} \\\\ x_{He}=\frac{2.00mol}{2.00mol+8.60mol}\\\\x_{He}=0.189[/tex]
Then, we calculate the partial pressure as shown below:
[tex]P_{He}=0.189 *48.0torr\\\\P_{He}=9.06torr[/tex]
Best regards!
A simple bread recipe calls for 400 g of flour,
7 g of salt (NaCl), 1 g of yeast, and 0.3 L of water (H2O). You have
exactly 0.6 mol of salt. If you want to use all of the salt, how many
loaves of bread could you make? How much of each of the other
ingredients would you need? PLEASE HELP !!
Answer:
5 loaves of bread you could make.
5g yeast, 1.5L water, 2000g of flour
Explanation:
To solve this question, we must, as first, convert the moles of salt to grams (1mol NaCl = 58.44g/mol -Molar mass-). With this mass we can find the amount of breads we can use and the amount of the other ingredients:
Mass NaCl:
0.6mol * (58.44g / mol) = 35g salt
Loaves of bread:
35g salt * (1 loave / 7g NaCl) = 5 loaves of bread you could make
Other ingredients:
1g yeast * 5 = 5g yeast
0.3L H2= * 5 = 1.5L H2O
400g flour * 5 = 2000g flour
The number of 5 loaves of bread you could make.
And, 5g yeast, 1.5L water, 2000g of flour
Calculation of the number of loaves, yeast, water, and flour:
Here we determine the following calculations:
For Mass NaCl:
0.6mol * (58.44g / mol) = 35g salt
Now
Loaves of bread:
= 35g salt * (1 loave / 7g NaCl)
= 5 loaves of bread you could make
And,
Other ingredients:
1g yeast * 5 = 5g yeast
0.3L H2= * 5 = 1.5L H2O
400g flour * 5 = 2000g flour
Learn more about water here: https://brainly.com/question/13011592
Where is chemical energy contained in a compound?
A. in the movement of the electrons
B. in the nuclei
C. in the bonds
D. in unbonded electrons
Answer:
C
Explanation:
Energy stored in the bonds of chemical compounds. Chemical energy may be released during a chemical reaction, often in the form of heat; such reactions are called exothermic.
Answer:
The Answer is C.
Explanation:
Cause I'm smart
How many moles can be found in 1.5 x 10^24 atoms of Calcium?
what causes fraud in public centres
Answer:
there are three causes of fraud, namely, perceived pressure, perceive opportunities and rationalizations. Pressure can take many forms, including financial and employment pressure. A fraudster also may commit fraud when there is an opportunity, frequently related to weak internal control.
Explanation:
This study found that the most popular type of fraud is misappropriation of assets, including theft of cash and inventories. No significant differences were seen in terms of fraudster position, as they can come from both the lower and the executive level. However, the majority of the fraudsters come from the operational and sales department. This study also found that majority of the fraudsters in the case study were male, new employees and young adults. Their motivations to commit fraud include lack of understanding about fraud behaviour, opportunity to commit fraud and lifestyle and financial pressure.
(hope this helps can i plz have brainlist :D hehe)
what are possible source of error for rusting of a nail
Answer:
A nail can rust when exposed to oxygen. the molecules of iron on the surface of the nail exchange atoms with the oxygen in the air and produce a new substance, the reddish brown ferrous oxide i.e rust.
