Using the half-life graph of cobalt-57, choose ALL the statements that are accurate.
es )
A)
The half-life of Co-57 is 20 days.
B)
The half-Life of Co-57 is 10 days.
C)
After fifty days, there is 0% or no Co-57 remaining.
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.

Answer:

the mercury would be lowest at location 4.

Explanation: this is because pressure and altitudes have inverse relationship at the troposphere. higher altitude has lower pressure. also pressure at location 4 contribute to pressure at location 1. but pressure at location 1 do not contribute to pressure at location 4.

Answer:

An increase in entropy

Explanation:

Doing the same question hope this helps

Answer:

True

Explanation:

Answer:

4.00

Explanation:

Answer:sorry

Explanation:

Answer:

C

Explanation:

C, because unlike A and B, it's an improvement in human population. And D wouldn't really be classified as an improvement as it states "Population has not decreased or increased significantly."

Answer:

Solution A is 1,000 times more acidic than Sol. B

Explanation:

for pH values we use scientific notation:

-log10 c (where c is the hydrogen ion concentration) is used to notate pH value (think of it as a unit)

ie:

10^-2 is sol A 10^-5 is sol B

5-2 is 3

10^-3 = 1000

there's a diff of 1,000 between the solutions.

The acidity or alkalinity of a solution depends on the hydronium ion concentration and hydroxide ion concentration. Here the solution A of pH 2.0 is more acidic than the solution of pH 5.0.

The pH of a solution is defined as the negative logarithm to the base 10 of the value of the hydronium ion concentration in moles per litre. When the pH of the solution is less than 7 it is acidic whereas when pH is greater than 7, it will be basic.

The pH of the solution is calculated by the equation:

pH = - log [H₃O⁺]

Then the concentration of H₃O⁺ is:

[H₃O⁺] = 10⁻pH

At pH = 2.0, [H₃O⁺] = 10⁻² = 0.01

At pH = 5.0, [H₃O⁺] = 10⁻⁵ = 0.00001

Thus here the Solution A is 1,000 times more acidic than Solution B.

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Answer:

Stage 1: 1 days.

Stage 2: 2-3 days.

Stage 3: 4-5 days.

Stage 4: 6 days.

Stage 5 (a-c): 7-12 days.

Stage 6: c. 17 days.

Stage 7: c. 19 days.

Stage 8: c. 23 days.

Answer: The  volume is 57.52 mL if the temperature if raised to 343K.

Explanation:

Given: [tex]V_{1}[/tex] = 27 mL,       [tex]T_{1}[/tex] = 161 K

[tex]V_{2}[/tex] = ?,        [tex]T_{2}[/tex] = 343 K

According to Charles law, at constant pressure the volume of an ideal gas is directly proportional to temperature.

Formula used is as follows.

[tex]\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\\\frac{27 mL}{161 K} = \frac{V_{2}}{343 K}\\V_{2} = 57.52 mL[/tex]

Thus, we can conclude that volume is 57.52 mL if the temperature if raised to 343K.

Answer:

color of water remains same

Answer:

O Presence of nucleus in cells

Explanation:

Answer:

4K + O₂ → 2K₂O

Los reactivos son: Potasio, Oxígeno, y óxido de potasio

Explanation:

El elemento químico número 19 es el potasio, un metal alcalino (Los metales alcalinos tienen estado de oxidación +1).

El óxido correspondiente debe tener fórmula K₂O (Oxígeno con carga -2 y 2 átomos de potasio con carga +1 dan el óxido neutro). La reacción es:

Answer:

option A,B,C

Explanation:

HCl

H2O

HC2H3O2

In the list given , following substance are classified as Acid:

HCl , HC₂H₃O₂ .

What is an Acid ?

A substance that can donate a proton or accept an electron pair to form a bond is called an Acid.

An acid turns Litmus paper red and has pH < 7 , It has the property of neutralizing alkali.

It has sour taste and can dissolve metals.

HCl is a strong acid , H₂O is neutral , HC₂H₃O₂ (Acetic acid) is a weak acid , NaCl is Salt , KOH and Mg(OH)₂ are strong base.

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Answer:

Explanation:

pH = -log{H+]

{H+} = 10^(-pH)

pOH = 14 - pH

{OH-} = 10^(-pOH)

pH 2.90 (the approximate pH of lemon juice

{H+} = 10^(-2.9)

pOH = 14 - 2.9 = 11.1

{OH-} = 10^(-pOH) = 10^(-11.1)

pH 3.86 (the approximate pH of sauerkraut)

{H+} = 10^(-3.86)

pOH = 14 - 3.86 = 10.14

{OH-} = 10^(-pOH)  = 10^(-10.14)

pH 10.81 (the approximate pH of milk of magnesia)

{H+} = 10^(-10.81)

pOH = 14 - 10.81 = 3.19

{OH-} = 10^(-pOH) = 10^(-3.19)

pH 4.11 (the approximate pH of orange juice)

{H+} = 10^(-4.11)

pOH = 14 - 4.11 = 9.89

{OH-} = 10^(-pOH) = 10^(-9.89)

pH 11.61 (the approximate pH of household ammonia)

{H+} = 10^(-11.61)

pOH = 14 - 11.61 = 2.39

{OH-} = 10^(-pOH)  = 10^(-2.39)

[tex]\huge \boxed{\mathcal {\gray { A nswer :}}}[/tex]

While balancing the chemical equations, the sub scripts aren't changed because by changing sub script we actually change the compound formed, hence coefficients are changed so the compound remains the same.

for example : ( for understanding )

in balancing the given reaction,

H2 + O2 =》H2O

if we change Oxygen's sub script in " H2O "

we get,

H2O + O2 =》H2O2

but here the compound formed isn't water, it is "H2O2" (hydrogen peroxide), so we can't change the sub script.

but by changing the coefficient, we get :

2 H2 + O2 =》2 H2O

Answer:

but you should

Explanation:

but you should

Answer: A

Explanation:

A

Heat is the product of the mass, specific heat, and delta temperature. The gold metal will reach the highest temperature. Thus, option A is correct.

Specific heat (c) is the heat required by a substance to get heated a unit mass by a unit of temperature. The specific heat is given as,

[tex]\rm c = \rm \dfrac{Q}{m \times \Delta T}[/tex]

Here, Q is the heat applied, m is the sample's mass and delta T is the change in the temperature.

The value of heat applied is the same for all the metals, so a change in temperature is calculated as,

[tex]\rm \Delta T = \rm \dfrac{Q}{c . m }[/tex]

From this, it can be said that the temperature is inversely related to the specific heat of the metal and hence the metal having the smallest c will have the highest change in the temperature.

Therefore, gold (c = 0.129 J/(g°C)) will reach the highest temperature.

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Explanation:

[tex]CH _{3}CH _{2}COOCH _{2} CH _{2}CH _{2}CH _{2}CH _{2}CH _{3}[/tex]

NAME: Hexylpropenoate

Answer:

D

Explanation:

earth orbits the sun. the sun doesn’t orbit around earth. and moon take 27 days around the earth

Answer:

b, and d

Explanation:

because it makes the most sense I might be wrong

Answer:

8.36 x 10^24 atoms/molecules

Explanation:

Avagadro's Number: 6.02214076 × 10^23

Avagadro's Number shows the number of molecules in 1 mole of substance. In this case, if there is 13.88 moles of lead, we multiply 13.88 by Avagadro's number:

(6.02214076 × 10^23)(13.88) = 8.358536 x 10^24 = 8.36 x 10^24

Answer:

the answer is

Explanation:

number of mollecoles

In chemistry a coefficient denotes the number that is seen in front of the formula of a equation. The coefficient in the given equation 4CO₂ is 4.

A number which precedes the formulas of reactants and products in order to balance a chemical equation is defined as a coefficient. It represents the number of atoms or molecules of each elements which are present in the reaction.

A chemical equation should be balanced and it must obey the law of conservation of mass which states that the number of reactants and products on both sides of the equation should be equal.

The coefficients are the numbers which are required to balance a chemical equation and it may vary while balancing a equation. The coefficient is found to be 1 if no number is mentioned in front of the formula of the reactants and products.

In the given equation 4CO₂, 4 is the coefficient which shows that 4 'C' atoms and 8 'O' atoms are present in the compound CO₂.

Thus the coefficient in the compound 4CO₂ is 4.

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Answer:

The total atoms present in the chemical formula is 13

Explanation:

Answer:

I think D

Explanation:

Kinetic energy has a direct relationship with mass, meaning as mass increases so does the kinetic Energy of an object.

Answer:

you hot A S F

Explanation:

Answer:

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Silver, or 107.8682 grams.

Explanation:

I took a test about this :)

Explanation:

Ductility is the ability of a material to be drawn or plastically deformed without fracture. It is therefore an indication of how ‘soft’ or malleable the material is. The ductility of steels varies depending on the types and levels of alloying elements present. An increase in carbon, for example, will increase the strength but decrease the ductility.

Answer:

ductility of a metal able to be drawn out into a long thin wire.

Answer:

the flavour or the taste or the packaging

Answer:

The answer would be a

Explanation:

That is what goes into the plant and oxygen IS an outcome