Scientists discover remains of wooden structures near a Celtic runes site. What kind of testing will indicate when the stones were moved into place by the Celts?

Carbon dating

Radioactive dating

Answer:

c or d

Explanation:

i tried a and it was wrong. its not B. and i cant see the rest. its the one that looks like a catipillar tho

Answer:

Its not A or B

Explanation:

666

Explanation:

nhgytfghgtfgv

The final temperature = 36 °C

The balanced combustion reaction for C₆H₆

2C₆H₆(l)+15O₂(g)⇒ 12CO₂(g)+6H₂O(l)  +6542 kJ

MW C₆H₆ : 78.11 g/mol

mol C₆H₆ :

[tex]\tt \dfrac{8.5}{78.11}=0.109[/tex]

Heat released for 2 mol C₆H₆ =6542 kJ, so for 1 mol

[tex]\tt \dfrac{0.109}{2}\times 6542=356.539~kJ/mol[/tex]

Heat transferred to water :

Q=m.c.ΔT

[tex]\tt 356.539=5.691~kg\times 4.18~kj/kg^oC\times (t_2-21)\\\\t_2-21=15\rightarrow t_2=36^oC[/tex]

Answer:

Watch Naruto that's the answer

Explanation:

Answer:

Salt water is classified as a mixture.

Explanation:

Answer: Bb

Explanation:

The capital B (purbred black fur) is domaint the the lower case b(purebred white fur)

Answer:

93.5 kPa

Explanation:

Step 1: Given data

Step 2: Convert the temperatures to the Kelvin scale

When working with gases, we need to consider the absolute temperature. We will convert from Celsius to Kelvin using the following expression.

K = °C + 273.15

T₁: K = 50°C + 273.15 = 323 K

T₂: K = 100°C + 275.15 = 373 K

Step 3: Calculate the final pressure of the gas

At a constant volume, we can calculate the final pressure of the gas using Gay-Lussac's law.

P₁/T₁ = P₂/T₂

P₂ = P₁ × T₂/T₁

P₂ = 81.0 kPa × 373 K/323 K

P₂ = 93.5 kPa

Answer:

Vinegar contains acetic acid which removes this coating. When the protective coating is removed, oxygen in the atmosphere can reach the iron in the steel wool and a chemical reaction called oxidation occurs. ... This reaction is also an exothermic reaction. It creates heat energy

Explanation:

hope this helps u

Vinegar incorporates acetic acid which gets rid of this coating. When the defensive coating is removed, oxygen in the environment can reach the iron in the metal wool and a chemical reaction called oxidation occurs. This reaction is additionally an exothermic reaction. It creates warmth energy.  

Hope it helped! Have a nice day! <3

Answer:

1.1 M

General Formulas and Concepts:

Explanation:

Step 1: Define variables

1.2 mol KCL

1.1 L of solution

M = unknown

Step 2: Solve for Molarity

Step 3: Check

We are given 2 sig figs. Follow sig fig rules.

1.09091 M ≈ 1.1 M

KOH added : 7.5 ml

Buffer solution of weak acid HCOOH and strong base KOH

Reaction

initial = 100 ml 0.1 M HCOOH = 10 ml mol HCOOH, and x mlmol of KOH

KOH + HCOOH ⇒ COOHK + H₂O

  x           10

  x            x                 x              x

  -            10-x             x              x

[HCOO - ] = 3[HCOOH]

[tex]\tt \dfrac{x}{x+100~ml}=3\dfrac{10-x}{x+100}\\\\x=3(10-x)\\\\x=30-3x\\\\4x=30\rightarrow x=7.5~ml[/tex]

Answer:

17.7

hope this helps

have a good day :)

Explanation:

17.7 g of potassium sulfite ([tex]K_2SO_3[/tex]) are required to dissolve in 872 g of water to make a 0.128M solution.

It is a measure of the concentration of a solute in a solution in terms of the amount of substance in a specified amount of mass of the solvent

You're looking for the mass of potassium sulfite, [tex]K_2SO_3[/tex], needed to make a 0.128 m, or 0.128 molal, solution.

Now, molality is used to express the concentration of a solution in terms of how many moles of solute it contains per kilogram of solvent.

This means that in order to find a solution's molality, you need to know

the number of moles of solute and the mass of the solvent expressed in kilograms.

In your case, you already know the mass of the solvent in grams, so the very first thing to do here is to convert it to kilograms.

872 g = 0. 872 Kg.

Now, a 0.128 m solution contains 0.128 moles of solute per kilogram of solvent. Since your sample contains 0.872 kg of solvent, it follows that it will contain 0.1116 moles [tex]K_2SO_3[/tex].

All you have to do now is use the molar mass of potassium sulfite to figure out how many grams would contain that many moles:

0.1116 moles x 158.26 g =17.7 g

Hence, 17.7 g of potassium sulfite ([tex]K_2SO_3[/tex]) are required to dissolve in 872 g of water to make a 0.128M solution.

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Balanced chemical equation :

[tex]2NH_3(aq)+AgCl(s) ->Ag(NH_3)_2^+(aq) + Cl^-(aq)[/tex],  [tex]K_{sp}=2.9\times 10^{-3}[/tex]

So, solubility product will be equal to [tex]K_{sp}[/tex] :

[tex]K_{sp}=\dfrac{[Ag(NH_3)_2^+][Cl^-]}{[NH_3]^2}\\\\2.9\times 10^{-3}=\dfrac{S.S}{(1.6-2S)^2}[/tex]

Solving above we get :

S = 0.041

Therefore, solubility of silver chloride is 0.041 .

Hence, this is the required solution.

Answer:

i hope this helps

Magma in the Earth's mantle moves in convection currents. The hot core heats the material above it, causing it to rise toward the crust, where it cools. The heat comes from the intense pressure on the rock, combined with the energy released from natural radioactive decay of elements.

Explanation:

Answer:

m

Explanation:

Answer:

Metals shows the property of malleability while non-metals are non-malleable. Metals are generally those substances that have a shiny surface and thus are lustrous. Whereas non-metals have non-shiny appearance and thus falls under the category of non-lustrous substances.

Explanation:

hope the answer was helpful

Answer:

[tex]V_{base}=9.442mL[/tex]

Explanation:

Hello!

In this case, when acetic acid is titrated with sodium hydroxide, the following chemical reaction is carried out:

[tex]CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O[/tex]

Whereas there is a 1:1 mole ratio between the acid and the base, which means that at the equivalence point we evidence:

[tex]n_{acid}=n_{base}[/tex]

Which in terms of volumes and concentrations is written as:

[tex]M_{acid}V_{acid}=M_{base}V_{base}[/tex]

Thus, solving for the required volume of base, we obtain:

[tex]V_{base}=\frac{M_{acid}V_{acid}}{M_{base}}=\frac{0.1894M*10.00mL}{0.2006M}\\\\ V_{base}=9.442mL[/tex]

Best regards!

Answer:

[tex]T_f=26.7\°C[/tex]

Explanation:

Hello.

In this case, when two substances at different temperature are placed in contact in an isolated container, we can say that the heat lost by the hot substance is gained by the cold substance. In such a way, since granite is at 76.0 °C and water at 22.0 °C we infer granite is hot and water is cold, so we write:

[tex]Q_{granite}=-Q_{water}[/tex]

In terms of mass, specific heat and change in temperature, we write:

[tex]m_{granite}C_{granite}(T_f-T_{granite})=-m_{water}C_{water}(T_f-T_{water})[/tex]

Thus, since the temperature is the same for both substance, we can solve for it as shown below:

[tex]T_f=\frac{m_{granite}C_{granite}T_{granite}+m_{water}C_{water}T_{water}}{m_{granite}C_{granite}+m_{water}C_{water}}[/tex]

By plugging in each variable, we obtain:

[tex]T_f=\frac{11.1g*0.790\frac{J}{g\°C} *76.0\°C+22.0g*4.18\frac{J}{g\°C} *22.0\°C}{11.1g*0.790\frac{J}{g\°C} +22.0g*4.18\frac{J}{g\°C}}\\\\T_f=26.7\°C[/tex]

Best regards!

Answer:

7 valence e-, obtain e-, negative

Answer:

8.3

Explanation:

pH is the measure of the H+ or H30 (they r the same thing) ions in a solution. it is equal to -log[H+]. [H+]=  Molar concentration of H+ ions.

Answer:

A: 2

Explanation:

Level one has one sublevel, whereas a Level two has two sublevels.

Answer:

a. A color change

c. Precipitate being formed

e. A change in temperature

f. Bubbles being produced

Explanation:

Two types of changes occur namely: physical changes and chemical changes. A physical change does not affect the chemical composition of the substance involved. Physical changes include change of state etc.

However, on the other hand, a chemical change alters the chemical composition of the substances involved, hence, leading to the formation of new product(s). It is also called a chemical reaction. Since a new product is formed from the alteration of the chemical nature of the reacting substances, the following changes or indicators will be present or evident in a chemical reaction:

- color change of substance

- Precipitate being formed i.e. solid deposit

- A change in temperature

- Bubbles being produced (evolution of gas)

Answer: Collision theory explains why different reactions occur at different rates, and suggests ways to change the rate of a reaction. Collision theory states that for a chemical reaction to occur, the reacting particles must collide with one another. The rate of the reaction depends on the frequency of collisions. The theory also tells us that reacting particles often collide without reacting. For collisions to be successful, reacting particles must (1) collide with (2) sufficient energy, and (3) with the proper orientation.

Molecules must collide before they can react

This rule is fundamental to any analysis of an ordinary reaction mechanism. It explains why termolecular processes are so uncommon. The kinetic theory of gases states that for every 1000 binary collisions, there will be only one event in which three molecules simultaneously come together. Four-way collisions are so improbable that this process has never been demonstrated in an elementary reaction.

Explanation:hope this helped

If two reactant molecules collide but do not have the right alignment then formation of product does not takes place.

Collision theory states that if reacting particles frequently collide without reacting. Reacting particles must collide with sufficient energy and the right orientation for collisions to be successful.

So it the two reactant molecules collide with each other without proper orientation then it will not convert into products.

Hence formation of product will not takes place if reactant does not collide with right allignment.

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The concentration, mass/volume percent (m/v) : 1.98%

[tex]\tt \%m/v=\dfrac{mass~solute}{volume~of~solution}\times 100\%[/tex]

mass solute = mass of NaCl = 30 g

volume of solution = volume of water + volume of NaCl

volume of water = 1.5 L = 1500 ml

volume of NaCl :(density = 2.16 g/ml)

[tex]\tt V=\dfrac{30}{2.16}=13.8~ml[/tex]

volume of solution :

[tex]\tt 1500+13.8=1513.8~ml[/tex]

the concentration (%m/v) :

[tex]\tt \dfrac{30}{1513.8}\times 100=1.98\%[/tex]

Answer:

I think its b

Explanation:

well because thermal energy its connected to kidnetic energy

Answer:

Tenacity describes the reaction of a mineral to stress such as crushing, bending, breaking, or tearing. ... The majority of all minerals are brittle. An example is Quartz. (Minerals that are not brittle may be referred to as Nonbrittle minerals.)

Answer:

1.9998 atm

Explanation:

Balance the equation and then use PV=nRT to find the variable.

The final pressure of the chamber is 2 atm.

The given parameters;

The balanced chemical reaction of the given elements;

[tex]O_2 \ \ + \ 2H_2 \ \ ---> \ 2H_2O[/tex]

Initial number of moles of the gases, = 1 + 2 = 3 moles

Final number of moles of the product, = 2  moles

The final pressure of the chamber is calculated as follows;

[tex]PV = nRT\\\\\frac{P}{n} = \frac{RT}{V} \\\\\frac{P_1}{n_1} = \frac{P_2}{n_2} \\\\P_2 = \frac{P_1 n_2}{n_1} \\\\P_2 = \frac{3 \times 2}{3} \\\\P_2 = 2 \ atm[/tex]

Thus, the final pressure of the chamber is 2 atm.

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Answer:

proton 5

Explanation:

I think it is fluorine