Carbon has a half life of 5730 years, how many years would it take a 4 g sample to
decay to .5 g

Answer:

Because the entire body functions off of the air given to the body through the lungs.

Answer:

True

Explanation:

Hope it helped. :)

Answer:

definitely true

Explanation:

everyone is different

Answer:

D.)  All of the above

Explanation:

Every answer is possible of creating heat.

* Good luck

Answer:

At the cathode in an electrolytic cell, ions in the surrounding solution are reduced into atoms, which precipitate or plate out on to the solid cathode. The anode is where oxidation takes place, and the cathode is where reduction takes place. The anode is defined as the electrode where oxidation occurs. The cathode is the electrode where reduction takes place. ... At the cathode, the metal ion in the solution will accept one or more electrons from the cathode, and the ion's oxidation state will reduce to 0. This forms a solid metal that deposits on the cathode.

Answer:

3m/s²

Explanation:

Given parameters:

Mass of object  = 3.2kg

Force to the right = 16.3N

Force to the left  = 6.7N

Unknown:

Acceleration of the object  = ?

Solution:

To solve this problem, we use newtons second law of motion;

   Net force  = mass x acceleration

 Net force on object  = Force to the right  - Force to the left

 Net force  = 16.3N  - 6.7N  = 9.6N

    So;

         9.6  = 3.2 x a

              a = [tex]\frac{9.6}{3.2}[/tex]   = 3m/s²

Explanation:

The molecules of the fertilizer after the phase change are more reactive compared to when in solid phase.

Answer:

19.6Watts

Explanation:

Given parameters:

Force applied  = 49N

Distance  = 2m

Time  = 5s

Unknown:

Power  = ?

Solution:

Power is the rate at which work is being done;

   Power  = [tex]\frac{Work done }{time}[/tex]

Work done  = force x distance  = 49 x 2 = 98J

So;

      Power  = [tex]\frac{98}{5}[/tex]  = 19.6Watts

Answer:

1s² 2s² 2p⁶ 3s²

Explanation:

La configuración electrónica muestra la secuencia de llenado de electrones en los orbitales de los subniveles guiada por algunos principios.

El número máximo de electrones en los orbitales de los subniveles es dos para el subnivel s (un orbital); seis para el subnivel p (tres orbitales); diez para el subnivel d (cinco orbitales) y catorce para el subnivel f (siete orbitales). Esto indica que el número máximo de electrones en un orbital es dos.

Se sabe que un elemento químico que tiene un número atómico Z = 12 y es un átomo neutro es Magnesio (Mg). Sin embargo, dado que tiene el mismo número de protones y electrones; La configuración electrónica esperada se puede escribir como:

1s² 2s² 2p⁶ 3s²

Answer:

36g

Explanation:

Given parameters:

Mass of H₂  = 4g

Unknown:

Mass of water produced  = ?

Solution:

The reactants in this experiment are hydrogen and oxygen gas. The product formed will be water, H₂O.

 Now write the reaction equation first;

                   2H₂  + O₂  →  2H₂O

Find the number of moles of Hydrogen gas;

         Number of moles  = [tex]\frac{mass}{molar mass}[/tex]  

  Molar mass of H₂  = 2(1) = 2g/mol

        Number of moles  = [tex]\frac{4}{2}[/tex]   = 2moles

From the balanced reaction equation;

             2 moles of H₂ will produce 2 moles of H₂O

So, mass of H₂O produced;

        Mass of H₂O = number of moles x molar mass

   Molar mass of H₂O  = 2(1) + 16  = 18g/mol

    Mass of H₂O  = 2 x 18 = 36g

We can see from the calculations that the use of 4g of hydrogen produces 36 g of water.

We know that water is produced from the equation;

2H2(g) + O2(g) ----> 2H2O(g)

Number of moles of hydrogen = 4 g/2 g/mol = 2 moles of hydrogen

From the reaction equation, we can see that 2 moles of hydrogen yields 2 moles of water.

Hence, If we use 4g  of hydrogen, we end up with 2 moles of water.

Mass of water = 2 * 18 g/mol = 36 g

Learn more about stoichiometry: https://brainly.com/question/1301963

Answer:

Explanation:

Given that:

The chemical equation for the reaction is:

             Br2(g)    ⇌  2Br(g)

Initially  0.0345M  0.0416M

[tex]Q_C = \dfrac{[Br]^2}{[Br_2]} = \dfrac{(0.0416)^2}{(0.0345)}= 0.05016[/tex]

[tex]Q_C =0.05016 >>> K_c(0.00584)[/tex]

Thus, the given reaction will proceed in the  backward direction

 The I.C.E table is as follows:

                       Br2(g)    ⇌  2Br(g)

I               0.0345                 0.0416

C                 +x                        -2x

E             (0.0345+x)            (0.0416 -2x)

[tex]K_c = \dfrac{[Br]^2}{[Br_2]} = \dfrac{(0.0416-2x)^2}{(0.0345+x)} = 0.00584[/tex]

= 0.00173056 - 0.0832x - 0.0832x + 4x² = 0.00584 (0.0345 +x)

= 0.00173056 - 0.166x + 4x² = 2.0148× 10⁻⁴ + 0.00584x

= 0.00173056 - 2.0148× 10⁻⁴ - 0.166x - 0.00584x + 4x²

= 0.00152908  - 0.17184x + 4x²

Solving by using Quadratic formula

x = 0.03038 or 0.0126

For x = 0.03038

At equilibrium

[Br₂] = (0.0345 + 0.03038) = 0.06488 M

[Br] =  (0.0416 -2(0.03038)) = - 0.01916 M

Since we have a negative value for [Br], we discard the value for x

For x = 0.0126

At equilibrium

[Br₂] = (0.0345 + 0.0126) = 0.0471 M

[Br] =  (0.0416 -2(0.0126)) = 0.0164 M

Answer:

An easy way of determining the type of bond within a molecule is to look for the type of compound involved.

Answer:

D

Explanation:

A P E X

D is the correct process to convert 36 yds to centimetres 2.54 cm = 1 in.

A metric unit of length, equal to one-hundredth of a metre.

To convert a yard measurement to a centimetre measurement, multiply the length by the conversion ratio. The length in centimeters is equal to the yards multiplied by 91.44.

D is the correct process to convert 36 yds to centimetres 2.54 cm = 1 in.

Learn more about centimetres here:

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Answer:

to determine the number of neutrons in atom, we only have to subtract the number of protons from the mass number. the nucleus of an atom is composed of protons and neutrons. And the number of particles present in the nucleus is referred as mass number (Also, called as atomic mass).

Explanation:

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The percentage of elements in the compound is determined from the number of elements in the compound

Proust states the Comparative Law that compounds are formed from elements with the same Mass Comparison so that compounds have a fixed composition of elements

[tex]\tt \%A~in~A_xB_y=\dfrac{x\times Ar~A}{MW~A_xB_y}\times 100\%[/tex]

[tex]\tt \%B~in~A_xB_y=\dfrac{y\times Ar~B}{MW~A_xB_y}\times 100\%[/tex]

Example

% Lithium (Li) in Li₂CO₃(lithium carbonate)

Ar of Li = 6.941 g/mol

MW of  Li₂CO₃  = 73.891 g/mol

[tex]\tt \%Li=\dfrac{2.Ar~Li}{MW~Li_2CO_3}\times 100\%\\\\\%Li=\dfrac{2\times 6.941}{73.891}\times 100\%=18.79\%[/tex]

Answer:

I think it's C

Explanation:

Answer:

Morphology and phylogenetics revealed by fossils. Perhaps the strongest evidence to support the Cambrian evolutionary explosion of animal forms is the first clear appearance, in the Early Cambrian, of skeletal fossils representing members of many marine bilaterian animal phyla

Explanation:

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Answer:

Ionic bonding involves the transfer of electrons from a metal atom to a non-metal atom until the outer shells of their resultant atoms are similar to that of a noble gas. The metals lose electrons and form cations while the non-metals accept the electrons and form anions.

When a chemical bond forms between metal and nonmetal atoms, the nonmetal atom accepts electrons from the metal atom to reach a stable state.

A bond that forms between metal and nonmetal atoms is called an ionic bond.  In ionic bonding, the metal atom, the cation, donates electrons to the nonmetal atom, the anion.

Thus, both electron donor and acceptor are able to reach an octet state through donation/acceptance of electrons and an ionic bond is formed as a result.

More on ionic bonding can be found here:  https://brainly.com/question/11527546?referrer=searchResults

Answer:

i hope it helps

Explanation:

The purpose of preparing the surface before beginning to plate another metal onto it is to ensure that it is clean and free of contaminants, which may interfere with the bonding. Contamination often prevents deposition and lack of adhesion. Normally this is done in three steps: cleaning, treatment and rinsing. Cleaning usually consists of using certain solvents such as alkaline cleaners, water, or acid cleaners in order to remove layers of oil on the surface. Treatment includes surface modification which is the hardening of the parts and applying metal layers. Rinsing leads to the final product and is the final touch to electroplating. Two certain methods of preparing the surface are physical cleaning and chemical cleaning. Chemical cleaning consists of using solvents that are either surface-active chemicals or chemicals which react with the metal/surface. In physical cleaning there is mechanical energy being applied in order to remove contaminants. Physical cleaning includes brush abrasion and ultrasonic agitation.

Answer:

Calcium phosphate chemical formula is given as Ca3(PO4)2.

Explanation:

Answer:

Calcium Phosphate is written as  Ca3(PO4)2.

Explanation:

Answer: 98.08 g/mol

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Answer:

o multiply the mass of each isotope by the decimal fraction representing its abundance naturally, then add all these products  together.

Explanation:

To find the average atomic mass of an atom, take the weighted average of all naturally occurring isotopes of an element and sum them together.

 Average mass of all isotopes  =  summation of all the  mass of isotopes of the element x abundance of the isotope.

 The abundance of the isotope is usually taken as a decimal fraction.

An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across

The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged)

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Answer:

2+7=9(constant)

6.5+2.5=9(variable)

Answer:

Question Answer

The half-life of cobalt-60 is 5.26 years. How many half-lives have passed in 10.52 years? 2

12.5% of a radioactive sample are left. How many half-lives have passed? 3

After 3 half-lives, how much of a 400 gram sample of radioactive uranium remains? 50g

Explanation:

Answer:

C

Explanation:

Answer: decrease I believe

Explanation:

Just because if you replaced copper with iron it gets stronger

Answer:

the outermost layer called Crust

Answer:

unsalted butter

Explanation: because it lets the real natural flavor come through.