The half-life of Co-60 is 5.3 years. If the initial mass of the sample is 1000g, how much will remain after 15.9 years?

Answer: B) The half-life of Co-57 is 10 days

D) After twenty days have elapsed, about 25% of the Co-57 remains.

E) Scientists have an 8 gram sample of Co-57. After thirty days, 1 gram remains.

Explanation:

You haven't added the 4 questions, so when you upload them, i'll answer.

Answer: During a phase change, such as melting or boiling, the kinetic energy increases.

Explanation:

Kinetic energy is the energy obtained by the molecules of a substance due to their motion.

When phase change such as melting or boiling takes place then it means heat is absorbed by the substance. As a result, their molecules more even more rapidly from one place to another due to which more number of collisions take place.

Hence, a change in phase of substance occurs as kinetic energy increases in melting or boiling process.

Thus, we can conclude that during a phase change, such as melting or boiling, the kinetic energy increases.

If the temperature of a gas inside a flexible container with a volume of 50 liters (L) decreases from 500°C to 100°C, then new volume will be 10L.

Volume and temperature of the gas is directly proportional to each other and for this question, equation becomes,

V₁/T₁ = V₂/T₂, where

V₁ = initial volume = 50L

T₁ = initial temperature = 500°C

V₂ = final volume = ?

T₂ = final temperature = 100°C

On putting values, we get

V₂ = (50)(100) / (500) = 10L

Hence required volume of gas is 10L.

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Explanation:

Regarding non-GHG environmental impacts, research suggests that production of biofuel feedstocks, particularly food crops like corn and soy, could increase water pollution from nutrients, pesticides, and sediment (NRC 2011). Increases in irrigation and ethanol refining could deplete aquifers (NRC 2011).Regarding non-GHG environmental impacts, research suggests that production of biofuel feedstocks, particularly food crops like corn and soy, could increase water pollution from nutrients, pesticides, and sediment (NRC 2011). Increases in irrigation and ethanol refining could deplete aquifers (NRC 2011)

Answer:

♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥

Answer:

Conductors

Explanation:

Answer:

lets be honest

Explanation:

no one knows and this is worthless to answer for the worth of 5 points

Answer:

The moons gravitational pull on Earth

Answer:

I dont understand what is the question you need help on-

Explanation:

Answer:

divide the distance by the average

Explanation:

ash QC ok

Answer:

orange

0.8

Explanation:

On egde

Acturus which is a star   with surface temperature 4290 K is orange in color and has a mass of 0.8 kilograms.

A star is an astronomical object comprising a luminous spheroid of plasma held together by self-gravity. The nearest star to Earth is the Sun. Many other stars are visible to the  eye at night, but their immense distances from Earth make them appear as fixed points of light. The most prominent stars have been categorised into constellations and asterisms, and many of the brightest stars have proper names.

Astronomers have assembled star catalogues that identify the known stars and provide standardized stellar designations. The observable universe contains an estimated 1022 to 1024 stars.A star's life begins with the gravitational collapse of a gaseous nebula of material composed primarily of hydrogen, along with helium and trace amounts of heavier elements.

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Answer:

Because the electrons in this ionic compound arent free to move and so cannot carry charge. For an iconic compound to conduct electricity it must be a liquid, either in a molten form or dissolved in water.

Explanation:

Is this clear?

Answer: the answer is 35.6

Explanation:

Look up the answer but take out you must show all your work and resources should pop up I’m on the same question now for chemistry so I’m putting 35.6L

Answer:

i think the second answer " fish migration might be prevented" might possibly be your answer

Answer:

b)sugar and water : Sedementation

d) salt and water : evaporation

Answer:

43.1atm is the pressure using gas law and 27.2atm using Van der Waals Law.

Explanation:

Ideal gas law is:

PV = nRT

Where P is pressure in atm

V is volume = 4.00L

n are moles of the gas (For chlorine Molar Mass: 70.90g/mol):

500g * (1mol / 70.90g) = 7.052 moles

R is gas constant = 0.082atmL/molK

T is absolute temperature = 25°C + 273 = 298K

To solve the pressure, P:

P = nRT/V

P = 7.052mol*0.082atmL/molK*298K / 4.00L

P = 43.1atm is the pressure using gas law.

Van der Waals equation is:

[tex]P + a(\frac{n}{V})^2 * (V-nb) = nRT[/tex]

Where a is 6.58L²atm*mol⁻²

b = 0.056Lmol⁻²

Solving for pressure:

[tex]P + a(\frac{n}{V})^2 = \frac{nRT}{(V-nb)}[/tex]

[tex]P = \frac{nRT}{(V-nb)}-a(\frac{n}{V})^2[/tex]

[tex]P = \frac{7.052mol*0.082atmL/molK*298K}{(4.00L-7.052mol*0.056L*mol)}-6.58L^2mol^{-2}(\frac{7.052mol}{4.00L})^2[/tex]

P = 172.323 / 3.6051 - 20.4866

P = 27.2atm using Van der Waals Law

Answer:

cuatro

Explanation:

ino->4

Alkynes are triple bonded hydrocarbons. There are 7 hydrogen in an alkyne with 5 carbon atoms. This compound can be named as pentyne.

Alkynes are hydrocarbons with one triple bond between two carbon atoms. alkynes are unsaturated compounds. Alkynes are named with the suffix 'yne' like ethyne, propyne etc..

There are three types of hydrocarbons namely, alkanes, alkenes and alkynes. Alkanes are saturated hydrocarbon having single bond between carbon atoms. Eg. methane , ethane etc all having suffix of 'ane'. Alkenes are unsaturated hydrocarbons with double bond between two or more carbon atoms.

Alkenes are named with the suffix 'ene'. Hence, the names become ethene, propene etc. The prefix for the names of hydrocarbons is based on the number of carbons. meth for 2, eth for 2 prop for 3, but for 4 and pent for 5 and so on.

The valency of carbon is 4 and it will bind to four other atoms. When it forms triple bond with a carbon it can bind to one hydrogen only. If it is a middle carbon then it dont have a hydrogen since either side will be carbons.

Thus for a 5 carbon alkyne, there will be total 7 hydrogens and the compound is pentyne.

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Answer:

the ability to breed successfully

Explanation:

Answer:

the ability to breed successfully

Explanation:

the more offspring's an organism has, the less chance of extinction would happen. I hope that helped bestie

Answer:

Freezing of water

Explanation:

When water becomes a solid it releases heat into its surroundings (warming it up).

Answer:

214

Explanation:

Q=mco

Q=heat

M is mass

C is specific heat

O is increased in temperature

Answer:

get what right?

Answer:

You didn't post the question.

Explanation:

Edit your question and I'll try to help you.

Hope this helped? Lol.

Answer:

A It changes shape and volume

Explanation:If a liquid turns into a gas it starts to change shape since they are not the same

Answer:I believe it’s A

Explanation:when a liquid turns into a gas it the volume increases of the substance and of course the shape changes

Answer:

0.0898M is the molarity of the basic solution

Explanation:

The reaction of calcium hydroxide, Ca(OH)₂ with H₃PO₄ is:

3 Ca(OH)₂ + 2 H₃PO₄ → 6H₂O + Ca₃(PO₄)₂

To solve this question we must find the moles of H3PO4 that react. With the moles and the rection we can find the moles of Ca(OH)2. Using its volume we can find its molarity:

Moles H3PO4:

0.0189L * (0.200mol / L) = 0.00378 moles H3PO4

Moles Ca(OH)2:

0.00378 moles H3PO4 * (3mol Ca(OH)2 / 2mol H3PO4) = 0.00567 moles Ca(OH)2

Molarity:

0.00567 moles Ca(OH)2 / 0.06315L =