Chemistry High School

What is the half-life of a radioisotope if a 20 g sample becomes 5 g after 2 days?

Answers

Answer 1

Answer: A- 1 day

Explanation: I really hope that helped. BYE!!

Answer 2

1 day is the half-life of a radioisotope if a 20 g sample becomes 5 g after 2 days

Related Questions

Forensic biologist Manning is looking at a cell sample under the microscope. The cell she sees is oval, with a long tail or flagellum. Immediately, she knows that this is a ________ cell.

red blood
skin
sperm
plant

Answers

Answer:

Sperm Cell

Explanation:

A gas is heated from 263.0 K to 298.0 K and the volume is increased from 24.0 liters to 35.0 liters by moving a large piston within a cylinder. If the original pressure was 1.00 atm, what would the final pressure be?

Answers

Answer:

The final pressure is approximately 0.78 atm

Explanation:

The original temperature of the gas, T₁ = 263.0 K

The final temperature of the gas, T₂ = 298.0 K

The original volume of the gas, V₁ = 24.0 liters

The final volume of the gas, V₂ = 35.0 liters

The original pressure of the gas, P₁ = 1.00 atm

Let P₂ represent the final pressure, we get;

[tex]\dfrac{P_1 \cdot V_1}{T_1} = \dfrac{P_2 \cdot V_2}{T_2}[/tex]

[tex]P_2 = \dfrac{P_1 \cdot V_1 \cdot T_2}{T_1 \cdot V_2}[/tex]

[tex]P_2 = \dfrac{1 \times 24.0 \times 298}{263.0 \times 35.0} = 0.776969038566[/tex]

∴ The final pressure P₂ ≈ 0.78 atm.

What did Rutherford contribute to the model of the atom?

the neutron

the proton

the nucleus

the electron

Answers

Answer:

the nucleus

Explanation:

He proposed that the mass of an atom is concentrated in the nucleus which occupies a small volume in the center .He added that the nucleus comprises the protons and neutrons.where the neutron had no charge while the protons had charge of +1

Answer:

the nucleus

Explanation:

how many torr is 2.7 atm?
2.7 atm = ? torr

Answers

Answer:

2.7 atm = 2052 torr

I hope this helps you.

Answer:

2052 torr

Explanation:

Multiply 2.7 atm by the conversion factor to torr which is 760 torr = 1 atm

grams. Number only, rounded to the
One mole of silver weighs
hundredths place (.01) *Y

Answers

Answer:

107.87 grams

Explanation:

One mole of silver weighs 107.87 grams .

answer truthfully:))

Answers

Answer:

Formula: [tex]Velocity \: V = f \lambda \\ Solution: = 5 \times 0.8 \\ = 4 \: {ms}^{ - 1} [/tex]

Answer:

The first guy is correct. That's what I got too

what is the name of the chemical used for bleach in sugar industries?

Answers

Answer:

Sulfur Dioxide

Explanation:

Sulfur dioxide is the chemical that, when released by factories using fossil fuels, combines with the atmosphere and can produce acid raid.

Which contains more carbon 4.71 g of C6H12O6 or 5.85 g C2H6O?

Answers

Answer:

5.85 g C2H6O has more carbon

Explanation:

Weight of carbon in 4.71 g of C6H12O6

[tex]4.71 * 12.01\\56.5671\\[/tex] grams

Weight of carbon in 5.85 g of C2H6O

[tex]5.85 * 12.01\\70.259\\[/tex] grams

Hence, 5.85 g C2H6O has more carbon

PLEASE HELP HELP ME. THIS IS DUE TODAY PLEASE

Answers

Answer:

B, C

Explanation:

Hope it helps i read it all

Se tienen 1.5 litros de hipoclorito de sodio concrntrado (6.1%) y se requiere preparar 1.0 litros de hipoclorito de sodio al 0.5% URGE!!!!!! POR FAVOR

Answers

Answer:

Tomar 82 mL de solución concentrada y agregar agua hasta un volumen final de 1.0 L.

Explanation:

Tenemos una solución concentrada de hipoclorito de sodio, cuya concentración es 6.1%, por lo tanto:

Cc = 6.1 %

Y debemos hacer una dilucion para obtener una solucion diluida con:

Cd = 0.5%

Vd = 1.0 L

Por lo tanto, podemos usar la siguiente fórmula para calcular el volumen a tomar de solucion concentrada (Vc):

Cc x Vc = Cd x Vd

⇒ Vc = (Cd x Vd)/Cc = (0.5% x 1.0 L)/6.1% = 0.082 L

0.082 L x 1000 mL/1 L = 82 mL

Por lo tanto, para preparar la solución debemos tomar 82 mL de solucion concentrada de hipoclorito de sodio 6.1% y agregar agua hasta un volumen final de 1.0 L.

How much so you can be dissolved and 50 mL of water at 30 Celsius see chart:)

Answers

Answer:

The correct answer is - 100 grams.

Explanation:

The solubility graph is a very useful tool because it tells you the amount of solute that can be dissolved per 100 mL of water in order to have a saturated solution of potassium nitrate at a given temperature.

In order to find the solubility of the salt at 30 ∘ C , start from the 30 ∘ C

mark on the graph and move up until you intersect the curve. At the point of intersection, move left until you intersect the y axis and read off the value that you land on which is 200. However, it is for 100 ml so half the value you read:

200/2 = 100 gram .

So, solubility ≈ 100 g / 50 mL water

So, a saturated solution of solute will hold about 100 g of dissolved solute, that is of dissociated solute, per 50 mL of water at 30 ∘ C .

Why can more water vapor (water molecules that are in the gas state of matter) be present in warm air than in cold air?

Answers

Answer:

Because warm air is less dense

Explanation:

IS ANYONE GOOD AT CHEMISTRY?! i need help please lol

Answers

Answer:

I'm ok at it.

Explanation:

I can try to help if you need anything:)

What is the molarity of a solution where one mole of NaOH is added to 2000mL of water

Answers

Answer:

Molarity of a solution where one mole of NaOH is added to 2000mL of water is 0.0005

Explanation:

Molarity is the equal to number of moles of solute divided by total volume of solvent

Given -

Number of moles of solute i.e NaOH = 1

Total volume of solvent i.e water = 2000 mL

Molarity [tex]\frac{1}{2000} = 0.0005[/tex]

answer asap pls i give brainliest

Answers

Answer:

B. Revolution is a planet's movement around the sun causing four seasons the occur. Rotation is the spinning of the planet on its axis causing day and night.

Graphene is made of pure _______________.

Answers

Answer:

Graphene is made of pure carbon.

Explanation:

It is a material in which the carbon atoms are arranged in a single layer, creating a honeycomb pattern. It should be stressed that this layer of carbon is only one atom thick, although some authors consider up to ten layers of carbon to be graphene.

please mark me brainliest

made of pure carbon

so2+o2 = so3 método de tanteo

Answers

Answer:

I dont understand

Explanation:

818191919

What effect does an increase in carbon dioxide (CO 2 ) have on the concentration of hydrogen ions (H^ + ) in the blood?

Answers

Answer:

As the level of carbon dioxide in the blood increases, more H+ is produced and the pH decreases. This increase in carbon dioxide and subsequent decrease in pH reduce the affinity of hemoglobin for oxygen. The oxygen dissociates from the Hb molecule, shifting the oxygen dissociation curve to the right.

. What is the molarity of 5.30 moles of NaCl dissolved in 0.400 L of solution?

Answers

Answer:

13.25 M

Explanation:

Molarity is moles over liters so simply plug your values in as such:

5.30 mol ÷ 0.400 L = 13.25 M

5. The number of atoms in 9.2 g of Na will be: A. 6.2 x 1023 atoms B. 2.408 x 1023 atoms C. 9.2 x1023 atoms D. 23 atoms E. 9.2 atoms

Answers

Answer:

The answer is "Option B"

Explanation:

Formula:

Na atoms= Na atoms moles \times NA

[tex]= \frac{mass}{Na \ Molar\ mass} \times 6.022 \times 10^{23}\\\\= \frac{9.2}{23} \times 6.022 \times 10^{23}\\\\=0.2875 \times 6.022 \times 10^{23}\\\\=2.4 \times 10^{23}\ atoms \\\\[/tex]

State of matter

A gas made up of homonuclear diatomic molecules escapes through a pinhole 3.98 times as fast as oxygen gas. Write the Chemical formula of the gas.

Answers

Answer:

H₂

Explanation:

To solve this question we must find, as first, find the molar mass of the homonuclear diatomic gas using Graham's law. With the molar mass we can identify this gas

Graham's law:

[tex]\frac{V_a}{V_b} =\sqrt{\frac{m_B}{m_A} }[/tex]

Where V is the speed of the gases and m the molar mass of those:

As Va is 3.98 times Vb (And mB is molar mass of oxygen gas = 32g/mol)

[tex]3.98 =\sqrt{\frac{32g/mol}{m_A} }[/tex]

15.84 = 32g/mol / mA

mA = 2.02g/mol

As is a homonuclear diatomic gas, the molar mass of the atom is 1.01g/mol. Thus, the gas is:

H₂

which of the following is true about these diagrams

Answers

Answer:

N/A NO DIAGRAM

Explanation:

N/A NO DIAGRAM

N/A NO DIAGRAM N/A NO DIAGRAM

N/A NO DIAGRAM

N/A NO DIAGRAM N/A NO DIAGRAM

N/A NO DIAGRAM

What is the purpose of a buffer?

Answers

The main purpose of a buffer solution is just to resist the change in pH so that the pH of the solution won't be much affected when we add an acid or base into it. The added acid or base is neutralized.

Answer: A buffer solution is a solution made to prevent the pH level of something from changing when you add a base or an acid to it. For example, if you put a buffer solution in a pool, and then you put chlorine in it, the chlorine's effect on the PH level will be suppressed.

If you put a link, you will be reported.

Answers

Answer:

5ppm

Explanation:

there are 1 million (1,000,000) µg (micrograms or mcg) per g (gram) ("micro" means millionth). So, 4. 1 part per million (ppm) for a 1g sample is 1 µg or .

I know you said no links, but this is a converter that explained it much better than I know how to

http://www.endmemo.com/sconvert/ppmug_g.php#:~:text=%C2%BB%20Microgram%2Fgram%20Conversions%3A&text=ug%2Fg%E2%86%94ppm%201%20ug%2Fg%20%3D%201%20ppm

heres a screenshot of the site (since i understand links are awful)

What is the systematic name of the following compound?
CaF 2

Answers

This is a binary ionic compound (an ionic compound consisting of two elements). The stock method of naming ionic compounds can be applied here.

First, identify and name the cation (the positive ion): Here, that would be the calcium (Ca2+) ion.

Next, identify and name the anion (the negative ion). Here, that would be the fluoride ion (F-). The anionic form of an element’s name can often be obtained by retaining the root and replacing the ending with -ide (e.g., sulfur becomes sulfide; oxygen becomes oxide; nitrogen becomes nitride; chlorine becomes chloride; bromine becomes bromide; etc.).

So the systematic name of CaF2 would be calcium fluoride.

This attached picture !!

Answers

Your best way of actually getting the answer is to scale and match each one to the correct tab on the table

Which term identifies a type of intermolecular force?
A.
covalent bonding
B.
hydrogen bonding
C.
ionic bonding
D.
metallic bonding

Answers

Answer: B. Hydrogen Bonding

Explanation: I got it right on castle learning lol

There are different kinds of forces. The term that identifies a type of intermolecular force is hydrogen bonding.

The three known to be types of intermolecular interactions. They are

Dipole–dipole interactions London dispersion forces hydrogen bonds.

Hydrogen bonding is known to be an intermolecular force that takes place between two molecules. That molecule is known to have a hydrogen atom be bonded to a nitrogen, oxygen, or fluorine atom.

Learn more about Bond from

https://brainly.com/question/1420470

A 1.0 liter flask contains 90.1 moles of water vapor at 27.0 oC. What is the pressure of the gas?

Answers

Answer:

The pressure of the gas is 224839.8 atm

Explanation:

As we know

PV = nRT

Substituting the given values, we get -

P * 1 L = 90.1 moles * 8.314 4621(75). J K−1 mol−1 * 300

P = 224839.8 atm

The pressure of the gas is 224839.8 atm

9.49.8 grams of Kl is dissolved in 1.00 kg of solvent. What is the molality?

Answers

Answer:

Molality = 9.498 mol k g − 1

Explanation:

A final way to express the concentration of a solution is by its molality. The molality ( m ) of a solution is the moles of solute divided by the kilograms of solvent. A solution that contains 1.0 mol of NaCl dissolved into 1.0 kg of water is a “one-molal” solution of sodium chloride.

molality = number of moles of solute/ mass of solvent in kg

number of moles of KI = mass of KI / molar mass of KI

number of moles of KI = 9.49.8 g / 1.00 g m o l − 1

number of moles of KI = 9.498 moles

molality = 9.498 moles / 1kg

molality = 9.498 mol k g − 1

how do you make a potion of slow falling

Answers

Answer:

So you can make it longer by putting in some redstone. And this will give you a potion that will last for 4 minutes. Alright we're done it's got 4 minute slow falling potions.

Explanation:

Answer:

Ok, to make a slow falling potion, you need 1 water bottle, 1 nether wart, and 1 fantom membrane.

Explanation:

hope I could help, lmk if I did!

Other Questions

Factor the expression completely. 60x^3+50x^5 What do motor manufacturing engineers do at real work place ? Acort Industries owns assets that will have a 75% probability of having a market value of $52 million in one year. There is a 25% chance that the assets will be worth only $22 million. The current risk-free rate is 5%, and Acort's assets have a cost of capital of 10%. a) If Acort is unlevered, what is the current market value of its equity? b) Suppose instead that Acort has debt with a face value of $18 million due in one year. According to MM (i.e. perfect market), what is the value of Acort's equity in this case? c) What is the expected return of Acort's equity without leverage? What is the expected return of Acort's equity with leverage? d) What is the lowest possible realized return of Acort's equity with and without leverage? The confederates controlled the navel and the sea True or false? What do coral reefs and estuaries have in common? I know this is in german but i really really need help... HELP ME Using the following equation, complete the square and find the center and radius of the circle:x2 + y2 + 4x 6y 12 = 0You must show all work and calculations to receive credit. how does the constitution safe guard inintrests of the majority or underprivilged Which one of the following statements concerning the magnetic field inside (far from the surface) a long, current-carrying solenoid is true?1) The magnetic field is zero.2) The magnetic field is independent of the number of windings.3) The magnetic field varies as 1/r as measured from the solenoid axis.4) The magnetic field is independent of the current in the solenoid.5) The magnetic field is non-zero and nearly uniform. Solve these equations: tan^2x-3tanx+2=0 I need help with my Spanish ASAP and dont make me have to download anything PLSExcerpt taken from The Historic Rise of Old Hickory by Suzanne B. WilliamsFour major candidates ran in the 1824 election, all under the "Democratic-Republican" name. One of the candidates, Andrew Jackson, was already famous. In the 1780s, he earned the right to practice law and served in various offices of the state government, including senator. He earned the nickname "Old Hickory" for his toughness as a general during the War of 1812 and First Seminole War. Jackson supported slavery and "Indian removal." This earned him support from voters in southern and frontier states. The other three candidates were John Quincy Adams of Massachusetts, Henry Clay of Kentucky, and William Crawford of Georgia.U.S. presidents are elected through the Electoral College. The Founding Fathers worried that Americans were too spread out to learn enough about the candidates. Under the Electoral College, Americans cast their ballot for the popular vote, which chooses the electors for each state. The number of electoral votes each state equals the number of representatives and senators combined. The candidates must win an absolute majority of electoral votes to win the election.In 1824, Andrew Jackson won the popular vote, but he did not win it in each state. Jackson and Adams both won many electoral votes. Jackson won the most with 99. However, a candidate needs an absolute majority of electoral votes to win. In 1824, Jackson needed 131 to win. When there is not majority winner, the election goes to the House of Representatives. This has only happened twice in U.S. history.Even though he won the popular vote and many electoral votes, Andrew Jackson lost the presidency in 1824. John Quincy Adams was the Secretary of State at this time. Henry Clay was the Speaker of the House of Representatives. Henry Clay, receiving the least, was left out. However, as a leader in the House of Representatives, he had influence over the other members. Clay openly hated Jackson and there were rumors that Clay made a deal with Adams in exchange for his support. The House election declared John Quincy Adams president. Soon, he chose Henry Clay to fill the seat he left vacant, Secretary of State. Jackson was shocked and enraged. Although there was no inquiry of possible wrongdoing, Jackson accused Adams and Clay of making a "corrupt bargain."John Quincy Adams was a disappointment as president. Many of his goals created divisions like federal funds for internal improvement. Some states thought that taking federal funds would force them to follow certain rules. They felt this reduced their rights as independent states. Jackson took advantage of issues like this one to gather more support. More Jackson supporters found their way to seats in Congress. He was as a man of the people and said Adams could never understand the common mans concerns.John Quincy Adams ran against Andrew Jackson in the 1828 election. Personal attacks grew even more vicious, but Andrew Jackson appealed to many. He believed government was for the common man. He believed in strict reading of the law and limited internal improvements. He also believed in states rights.Andrew Jackson easily won the 1828 election, winning both the popular vote and a majority of electoral votes. Historians note the sectional nature of the voting. Support for Jackson was concentrated in South while Adams support was mostly in the North. Jackson was so popular because he brought changes to the government. He also wanted to make sure the government was responsible for its actions. Jackson pushed settlement into the frontier. He supported the Indian Removal act. He also defended the spread of slavery. Though his support was heavier in the South, he was determined to keep a unified nation. The rise and presidency of Old Hickory is memorable to Americans today.Which of the following did Andrew Jackson not support? A limited national government Spreading of slavery to the frontier Federal funds for internal improvements A strict interpretation of the U.S. Constitution write the equations in slope y-intercept form The Congress, whenever two-thirds of both houses shall deem it necessary, shall propose _____?______ to this Constitution, or on the application of the legislatures of two-thirds of the several states, shall call a convention for proposing ______?_________, which, in either case, shall be valid to all intents and purposes, as part of this Constitution, when ratified by the legislatures of three-fourths of the several states. Which value below shows the strongest correlation?A. 0.72B. 0.35C. 0.91D. 0.99E. 0.88F. 0.29G. 0.06H. -0.55 Alphonsus went shopping for new school clothes. He bought 4 t-shirts and 3 pairs of pants.How many different outfits can Alphonsus put together with his new clothes?A. 1B. 3C. 4D. 7 E. 12 What crisis politically hurt President Carter during the presidential election of 1980 and was seen as a personal insult after be was not reelected? a. PLO hostage crisis Israeli hostage crisis b. Soviet hostage crisis d. Iranian hostage crisis C. Wesley, who is single, listed his personal residence with a real estate agent on March 3 of the current year at a price of $390,000. He rejected several offers in the $350,000 range during the summer. Finally, on August 16, he and the purchaser signed a contract to sell for $363,000. The sale (i.e., closing) took place on September 7. The closing statement showed the following disbursements: Real estate agent's commission $21,780 Appraisal fee 600 Exterminator's certificate 300 Recording fees 800 Mortgage to First Bank 305,000 Cash to seller 34,520 Wesley's adjusted basis for the house is $200,000. He owned and occupied the house for seven years. On October 1, 2017, Wesley purchases another residence for $325,000. a. Wesley's recognized gain on the sale is __________b. Wesley's adjusted basis for the new residence is ___________c. Assume instead that the selling price is $800,000. Wesley's recognized gain is _____________, and his adjusted basis for the new residence is __________ Which of the following is not an example of a chemical change?A. rusting iron B. an apple ripening C. cutting paper D. a piece of wood burning Need help answering this question.