Suppose a disease wipes out most of the fox population in
the food web shown.
Mountain
lion
Deer
Hawk
Fox
Rabbit
Owl
Snake
Green
plant
Mouse
Which two populations are most likely to increase as a result?
A. Mountain lion
B. Mouse
ロロロロ
O C. Rabbit
D. Green plant

Bone age : 22,920 years

Given

Nt = 2.5 g C-14

No = 40 g

half-life = 5730 years

Required

time of decay

Solution

General formulas used in decay:  

[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}[/tex]

t = duration of decay  

t 1/2 = half-life  

N₀ = the number of initial radioactive atoms  

Nt = the number of radioactive atoms left after decaying during T time  

Input the value :

[tex]\tt 2.5=40.\dfrac{1}{2}^{t/5730}\\\\\dfrac{2.5}{40}=\dfrac{1}{2}^{t/5730}\\\\(\dfrac{1}{2})^4=\dfrac{1}{2}^{t/5730}\\\\4=t/5730\rightarrow t=22920~years[/tex]

Answer:

D a compound

Explanation:

Answer: [tex]H_2O_2\rightarrow H_2+O_2[/tex]

Explanation:

Decomposition is a type of chemical reaction in which one reactant gives two or more than two products.

According to law of conservation of mass, mass can neither be created nor be destroyed. Thus the number of atoms of each element must be same on reactant and product side. Thus chemical equations are balanced.

The balanced equation for the decomposition reaction  of hydrogen peroxide is:

[tex]H_2O_2\rightarrow H_2+O_2[/tex]

Decomposition is a type of chemical reaction in which a chemical breaks into two or more molecules or atoms. One reactant breaks into two products which can be shown as:

                                         XY----->X + Y

The decomposition reaction of hydrogen peroxide can be written as:

                                              [tex]H_{2}O_{2} = H_{2} + O_{2}[/tex]

Therefore, the balanced chemical reaction of decomposition of hydrogen peroxide will be:

                                             [tex]H_{2}O_{2} = H_{2} + O_{2}[/tex]

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Answer:

Continuing on across the periodic table we see that fluorine is the next element after oxygen. ... Rather than forming seven bonds fluorine only forms a single bond for basically the same reasons that oxygen only forms two bonds. Hydrogen fluoride, HF, has one bond, but four centers of electron density around the fluorine.

Answer:

four A

Explanation:

Answer: B) One

Explanation: One carbon dioxide molecule should be added to the products side to balance the equation and obey the law of conservation of matter.

Also, just took the test. One is correct.

Answer:

Explanation:

From the information given:

(a)

[tex]Concentration \ in \ mg/L = \dfrac{Mass \ of \ MTBE \ in \ mg}{Total \ volume (in \ L)}[/tex]

[tex]Concentration \ in \ mg/L = \dfrac{222 \times 10^3 \ mg}{22}[/tex]

[tex]Concentration \ in \ mg/L = 111 \times 10^3 \ mg/L[/tex]

(b)

[tex]number \ of \ mole s= \dfrac{mass}{molar \ mass } \\ \\ number \ of \ mole s=\dfrac{222 \ g}{88.15 \ g/mol} \\ \\ \mathbf{= 2.518 mol}[/tex]

(c)

[tex]w/w \ percentage = \dfrac{mass \ of \ MTBE }{mass \ of \ solution (RFG)}\times 100\%[/tex]

[tex]where; \\ \\ mass \ of \ (RFG) = 2L \times 0.70 g/mL \\ \\ mass \ of \ (RFG) = 2000 ml \times 0.70 g/mL \\ \\ mass \ of \ (RFG) = 1400 g[/tex]

∴

[tex]w/w \ percentage = \dfrac{222 \ g}{1400 \ g}\times 100\% = \mathbf{15.8\%}[/tex]

(d)

[tex]Volume of MTBE =\dfrac{mass \ of \ MTBE}{density \ of \ MTBE}[/tex]

[tex]Volume \ of \ MTBE = 300 \ mL\\[/tex]

∴

[tex]v/v\% = \dfrac{volume \ of \ MTBE}{volume \ of \ RFG} \\ \\ v/v\% =\dfrac{300 \ mL}{2000 \ mL}\times 100\% \\ \\ \mathbf{v/v\% = 15.00\%}[/tex]

(e)

[tex]From \the \ given \ information; \\ \\ 2.5184 \ moles\ of \ MTBE contain \ 2.5184 \ mole of oxygen[/tex]

∴

[tex]mass of oxygen MTBE = 2.5284 mol \times 16\ g/mol \\ \\ mass of oxygen MTBE = 40.3 9 \ g\\ \\ mass\ of \ RFG = 1400 g[/tex]

∴

[tex]\% w/w = \dfrac{mass \ of \ oxygen}{mass \ of RFG }=\dfrac{40.22 \ g}{1400 \ g} \times 100\%[/tex]

[tex]\% w/w == 2.88\%[/tex]

Assume That The Density Of RFG Is 0.7 G/mL And The Density Of MTBE Is ... are added to gasoline, resulting in a total volume of 2 L of reformulated gas (RFG). ... Assume that the density of RFG is 0.7 g/mL and the density of MTBE is 0.74 g/mL. Determine the concentration of MTBE in the RFG in the following units (a-d)

Answer:bromine

Explanation:

Answer:

0.491 mol NaCl

Explanation:

Convert from grams to moles using the molar mass of NaCl:

28.7 g NaCl x 1 mol NaCl/58.44 g NaCl = 0.491 mol NaCl

The molar mass (58.44 g) can be found from adding the molar masses of the individual elements (Na and Cl); the g NaCl will cancel out (dimensional analysis), leaving you with mol NaCl.

Answer:

5

Explanation:

There are 2 moles of CO in each CO2. 10 ÷ 2 = 5

Answer: it's 4nitrogen

denotes two nitrogen atoms. 2. N 2 denotes one molecule of nitrogen gas.

Explanation:

Answer:

this will copper this is correct answer

Question asked: David went shopping with his mom for house renovations supplies. They were looking for materials that would conduct electricity. Which material should they buy?

Answer: Copper

Explanation: Copper would be the right answer because that's the only material that would conduct electricity.

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I hope this helps!

Answer:

Synthesis

Explanation:

Two reactants are becoming one product, so it is a synthesis reaction.

Decomposition is the opposite, so when one molecule becomes simpler atoms.

Example: 2NaCl -> Cl2 + Na

Combustion is reaction with a product of water and carbon dioxide.

Example: CH4 + 2O2 -> CO2 + 2H2O

Single displacement is when one atom takes the place of the other.

Example: K + NaCl -> KCl +Na (where K took the place of Na)

Double displacement is like single displacement but it happens twice. Think of it like the atoms exchanging partners.  

Example: HCl +NaH -> NaCl + HOH

Answer:

(i) N2(g)+3H2(g) -->2NH3(g) - When the equilibrium changes, the concentrations of all substances involved in the equilibrium must also change. For our equilibrium reaction: N2(g) + 3H2(g) ⇔ 2NH3(g) + Heat

(ii) 2 H2(g) + O2(g) --> 2 H2O(g) - Synthesis Reaction

HENCE BOTH THE REACTIONS COULD BE CLASSIFIED AS SYNTHEYIC REACTION

PLEASE DO MARK MY ANSWER AS THE BRAINLIEST..

<HOPE IT HELPS>

Answer:

2.03

Explanation:

Let's assume we have 1 L of the solution:

With that information we can calculate the molality:

Keep in mind that this is only an estimate, as we used the kg of the solution and not of the solvent.

The molality of an ethylene glycol solution is 2.03 kg.

The moles of solute divided by the mass of solvent in kilograms is known as the molality of a solution.

Calculation of molality:

Given that, molarity is 2.07 M

Density is 1.02 g/ml

Step 1: To convert  the litre into grams, multiply the quantity by 1000

The weight of the solution is [tex]\bold{1.02 \;g/ml\; \times 1000 = 1020 g}[/tex]

Now, molality = moles of solute is divided by mass of solvent in kilograms.

[tex]\bold{Molality = 2.07 \times \dfrac{1020}{1000} = 2.03\; kg}[/tex]

Thus, the molality of the solution is 2.03 kg

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   molality = moles of solute / kg of solvent

   molality = 2.07 moles / (1020 ÷ 1000) = 2.03 m

Keep in mind that this is only an estimate, as we used the kg of the solution and not of the solvent.

Answer:

Explanation:

I think you forgot to attach an image here!

Answer: 310.7 grams

Explanation:

Multiply the two values so the units of mL cancel and you get grams

2.545*122.1 = 310.7 grams

Answer:

I cant see it that well but id be happy to help if u post a clearer picture!

Explanation:

Using Avogrado's constant (6.022e23):

4(6.022e23) = 2.41e24

Answer:

The answer is C: has at least three oxidation states.

Explanation:

you're welcome

Answer:

C

Explanation:

got it right on Edge

Answer:

Zero

Explanation:

Answer:

[tex]m_{iron}=32.1g[/tex]

Explanation:

Hello!

In this case, since the interaction between hot iron and cold water allows the heat transfer from iron to water and therefore we can write up the following energetic equation:

[tex]Q_{iron}+Q_{water}=0[/tex]

Whereas the heat terms can be written in terms of mass, specific heat and temperature change:

[tex]m_{iron}C_{iron}(T_f-T_{iron}) + m_{water}C_{water}(T_f-T_{water}) = 0[/tex]

So we solve for the mass of iron as follows:

[tex]m_{iron} = \frac{m_{water}C_{water}(T_f-T_{water})}{C_{iron}(T_f-T_{iron}) }[/tex]

Now, we plug in the given data to obtain:

[tex]m_{iron} = \frac{-100g*0.449\frac{J}{g\°C} (25.7\°C-22.0\°C)}{0.449\frac{J}{g\°C} (25.7\°C-93.3\°C) }[/tex]

[tex]m_{iron}=32.1g[/tex]

Best regards!

Answer:

Microscopes and telescopes often use two lenses to make an image large enough to see. A compound microscope uses two lenses to achieve high magnification. Both lenses are convex, or converging. Light from the object first passes through the objective lens.

Explanation:

A compound microscope uses two lenses to achieve high magnification

Answer:

0.83M is molarity of the solution

Explanation:

In a 5% w/v solution of vinegar there are 5g of acetic acid per 100mL of solution. Or 50g per liter of solution. As molarity is defined as the moles of the solute (Acetic acid) per liter of solution we need to convert the 50g per liter to moles per liter using molar mass of acetic acid:

Molarity:

50g/L * (1mol / 60.052g) = 0.8326moles/L =

Answer:

b

Explanation:

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Answer:

1H₂  +  1Cl₂  →   2HCl

Explanation:

The reaction that illustrates the law of conservation of mass is shown below:  

         1H₂  +  1Cl₂  →   2HCl

According to the law of conservation of mass "in a chemical reaction, matter is neither created nor destroy but atoms are rearranged".

Therefore, we are expected to the end a reaction with the amount of substance we start with.

 Element                                H                                    Cl

Reactants                               2                                      2

Products                                 2                                      2

We see that number of atoms on both sides are the same.

Answer:

1. The Earth's orbit around the Sun is an ellipse, but it does change shape. ...

The tilt in the axis of the Earth is called its obliquity

Explanation:

2.Volcanic eruptions pump out clouds of dust and ash, which block out some sunlight.

Answer:

A

Antoine-Laurent Lavoisier

:D

The scientist was most essential to the use of radioactive isotopes in medicine is " John Lawrence's".

The radioactive isotopes of such an element were called radioisotopes. Atoms that have too much energy in their nucleus or even an unstable neutron-proton pair.

It marked the beginning of John Lawrence's lengthy career of service and the first time a radioactive isotope had already been employed in the management of a human illness. His laboratory is regarded as the origin of nuclear medicine, for which he is regarded as its father.

The scientist most essential to the use of radioactive isotopes in medicine is " John Lawrence's".

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Answer:

1 mole is equal to 1 moles Krypton, or 83.798 grams.

Explanation: