Ultrasound waves do not transmit easily through bone. State what you think happens to ultrasound waves when they reach a bone in the body. Give evidence to support your claim and explain your answer. ​

Answer:

A nail can rust when exposed to oxygen. the molecules of iron on the surface of the nail exchange atoms with the oxygen in the air and produce a new substance, the reddish brown ferrous oxide i.e rust.

Answer:

NO

Explanation:

Water and N₂ cannot be the answer because they are products of the reaction, not reactants.

The fact that some ammonia (NH₃) is left in the container once the reaction is finished tells us that NH₃ is the reactant in excess.

The remaining reactant is thus the limiting reactant. The correct answer is NO.

Answer:

pressure must remain constant

Explanation:

charles law= V/T

where pressure remains constant

If Charles' law is to be applied to a given sample of a gas, then it must have constant pressure.

Gas law are the hypothesis which tells about the behavior of gas at different conditions.

According to the Charles' Law, volume of the gas at any constant pressure and no. of moles of gas is directly proportional to the temperature of the gas at that condition. Charles' law is represented as:

V ∝ T, where

V = volume of gas

T = temperature of gas

Hence option (a) is correct i.e. pressure.

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Answer:

there are three causes of fraud, namely, perceived pressure, perceive opportunities and rationalizations. Pressure can take many forms, including financial and employment pressure. A fraudster also may commit fraud when there is an opportunity, frequently related to weak internal control.

Explanation:

This study found that the most popular type of fraud is misappropriation of assets, including theft of cash and inventories. No significant differences were seen in terms of fraudster position, as they can come from both the lower and the executive level. However, the majority of the fraudsters come from the operational and sales department. This study also found that majority of the fraudsters in the case study were male, new employees and young adults. Their motivations to commit fraud include lack of understanding about fraud behaviour, opportunity to commit fraud and lifestyle and financial pressure.

(hope this helps can i plz have brainlist :D hehe)

The standard cell potential of this reaction is obtained from the calculations as 3.21 V

An electrochemicall cell is onee in which electrical energy is produced from a chemical reaction. A cell reaction is sponteanous of the standard cell potential is positive.

Now;

E∘cell = E∘cathode - E∘anode

E∘cathode = 0.34 V

E∘anode = (-2.87 V)

E∘cell = 0.34 V - (-2.87 V) = 3.21 V

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Answer:

Explanation:  Ethanol, CH3CH2OH, has the highest of the three boiling points because it has the strongest dipole–dipole forces between molecules due to hydrogen bonding. ... Dimethyl ether, CH3OCH3, has the second- highest boiling point because it has dipole–dipole forces between molecules.

Answer:

c.

Explanation:

I think???

Answer:

bcs the oven heated it up?

Explanation:

Answer:

C. 548mL

Explanation:

Attached is an image of the explanation. Hope this helps!

Combined gas law states that "the ratio of the product of pressure and volume and the absolute temperature of a gas is equal to a constant".

Temperature ,T₁ = 20⁰C = 20+273.15K = 293.15K

Temperature, T₂ = 40⁰C = 40+273.15K = 313.15K

According to combined gas law,

P₁V₁/n₁T₁ = P₂V₂/n₂T₂

Where, n is moles of substance

P is pressure

P and n are considered to be a constant.

Thus, V₁/T₁ = V₂/T₂

V₁ = V₂T₁/T₂

V₁ = ?,

V₂ = 585mL = 585mL x 293.15K/313.15K

V₁ = 548mL

Hence, the original volume of the helium gas is 548mL.

"Pressure is the force of all the gas particle/wall collisions divided by the area of the wall."

"Volume is the amount of space occupied by a substance."

"Temperature is the measure of hotness or coldness expressed in terms of any of several scales, including Fahrenheit and Celsius."

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Answer: n= 3, l= 0 , m= 0 and s=[/tex]\frac{-1}{2}[/tex]

Explanation:

Principle Quantum Numbers : It describes the size of the orbital and the energy level. It is represented by n. Where, n = 1,2,3,4....

Azimuthal Quantum Number : It describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1). For l = 0,1,2,3... the orbitals are s, p, d, f...

Magnetic quantum number :  It describes the orientation of the orbital. It is represented as 'm'. The value of m ranges from -l to +l.

Spin quantum number:  It describes the spin of the electron. It is represented as 's'. The value of s can be +1/2 or -1/2

[tex]F^{2-}:11: 1s^22s^22p^63s^1[/tex]

[tex]F^{3-}:12:1s^22s^22p^63s^2[/tex]

Thus electron enters 3s orbital , thus n= 3, l= 0 , m= 0 and s=[/tex]\frac{-1}{2}[/tex]

Answer:

endothermic reactions

Explanation:

Endothermic reactions are those reactions that absorbs heat from the surroundings as opposed to the exothermic reaction that releases heat energy. This heat absorption that characterizes endothermic reactions causes the surrounding to be cool.

However, in an endothermic reaction, more energy is needed to be absorbed in order to break the bonds of the reactants to form products, hence, making the activation energy of endothermic reactions HIGHER.

Answer:

Synthesis Reaction

Explanation:

Here we see H2 and O2 are being combined H2O. Synthesis reactions are where we see a combination to make a single product.

So here it'd be A + B =AB

2Na(s)+Cl2(g)→2NaCl(s)

Decomposition would be the break down of a compound into 2, the opposite of synthesis.

AB = A + B

2HgO(s)→2Hg(l)+O2(g)

Single replacement is where  1 element replaces another in a reaction, or switches place with 1 element.

AY + B = A + BY

2 HCl(aq) + Zn(s) → ZnCl2(aq) + H2(g)

Double replacement is similar but 2 elements are switch/replaced.

AY + BX = AX + BY

CuCl2(aq) + 2 AgNO3(aq) → Cu(NO3)2(aq) + 2 AgCl(s)

Answer:

Chemical property is a characteristic of a particular substance that can be observed in a chemical reaction.

Explanation:

Hope this helps :)

Answer:

A chemical property is any of a material's propertiesthat becomes evident during, or after, a chemicalreaction; that is, any quality that can be established only by changing a substance's chemical identity. ... They can also be useful to identify an unknown substance or to separate or purify it from other substances.

Answer:

True

Explanation:

The statement having more moles of solute definitely means a higher concentration (molarity) solution is true.

Molarity is used to define concentration of any solution and it will be define as the no. of moles of solute present in per liter of solution and it is represented as:
M = n/V

From the equation it is clear that molarity of is directly proportional to the moles of the solute present in that. So, more no. of moles shows more concentration of solution.

Hence, given statement is true.

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Answer:

5 loaves of bread you could make.

5g yeast, 1.5L water, 2000g of flour

Explanation:

To solve this question, we must, as first, convert the moles of salt to grams (1mol NaCl = 58.44g/mol -Molar mass-). With this mass we can find the amount of breads we can use and the amount of the other ingredients:

Mass NaCl:

0.6mol * (58.44g / mol) = 35g salt

Loaves of bread:

35g salt * (1 loave / 7g NaCl) = 5 loaves of bread you could make

Other ingredients:

1g yeast * 5 = 5g yeast

0.3L H2= * 5 = 1.5L H2O

400g flour * 5 = 2000g flour

The number of 5 loaves of bread you could make.

And, 5g yeast, 1.5L water, 2000g of flour

Here we determine the following calculations:

For Mass NaCl:

0.6mol * (58.44g / mol) = 35g salt

Now

Loaves of bread:

= 35g salt * (1 loave / 7g NaCl)

= 5 loaves of bread you could make

And,

Other ingredients:

1g yeast * 5 = 5g yeast

0.3L H2= * 5 = 1.5L H2O

400g flour * 5 = 2000g flour

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Answer:

The reaction given is  

Chemistry homework question answer, step 1, image 1

Since in equilibrium constant expression, the concentration of liquid components is not written.

Hence the equilibrium constant expression for the above reaction can be written as  

Chemistry homework question answer, step 1, image 2

where [NO] = equilibrium concentration of NO

[NO2 ] = equilibrium concentration of NO2

[HNO3 ] = equilibrium concentration of HNO3

Step 2

Given : mass of NO at equilibrium = 18.6 g

mass of NO2 at equilibrium = 15.1 g

and mass of HNO3 at equilibrium = 13.1 g

Since molar mass of HNO3 = 63 g/mol, molar mass of NO = 30 g/mol and molar mass of NO2 = 46 g/mol

Hence the moles of gases at equilibrium are

Chemistry homework question answer, step 2, image 1

Step 3

Since mass of solution = mass of HNO3 + mass of water = 13.1 + 234.8 = 247.9 g

Assuming density of solution = density of water = 1.00 g/mL

=> mass of solution = volume of solution X density of solution  

=> 247.9 = 1.00 X volume of solution  

=> volume of solution = 247.9 mL = 0.2479 L      

Explanation:

Answer:

D

Explanation:

Answer:

False.

Explanation:

The given statement asserts a false claim because the equator is the region that receives maximum sunlight. The equator is placed right below the sun and thus, it tends to receive the maximum radiation across the year. While the poles are the coldest regions of the Earth because due to Earth's titled axis, they receive very few sun rays for a certain time of the year. Thus, if we move away from the equator, we are likely to receive less radiation from the sun as the sun keeps getting farther while moving away from the equator.

E⁣⁣⁣⁣xplanation i⁣⁣⁣⁣s i⁣⁣⁣⁣n a f⁣⁣⁣⁣ile

bit.[tex]^{}[/tex]ly/3a8Nt8n

The best answer for your question would be C. The total amount of all forms of energy stays the same.

First, let's eliminate the wrong choices. According to the Law of Conservation of Energy, you cannot create nor destroy energy, so you can eliminate choices A and B.

Also according to the Law of Conservation of Energy, the total amount of energy will always be the same. It may transform into different forms of energy.

To me, D doesn't sound very correct. For this one you can take an aducational guess, but I do not believe it would be D.

Hope this helps; have a great day!

Answer:

mixture of colours answer

Answer:

[tex]P_{He}=9.06torr[/tex]

Explanation:

Hello there!

In this case, we can identify the solution to this problem via the Dalton's rule because the partial pressure of helium is given by:

[tex]P_{He}=x_{He}P_T[/tex]

Whereas the mole fraction of helium is calculated by firstly obtaining the moles and then the mole fraction:

[tex]n_{He}=8.00g\frac{1mol}{4.00g}=2.00mol\\\\ x_{He}=\frac{n_{He}}{n_{He}+n_{Ar}} \\\\ x_{He}=\frac{2.00mol}{2.00mol+8.60mol}\\\\x_{He}=0.189[/tex]

Then, we calculate the partial pressure as shown below:

[tex]P_{He}=0.189 *48.0torr\\\\P_{He}=9.06torr[/tex]

Best regards!

Answer:

B or 0.1538

Explanation:

Remark

For every mol of NaN3 that decomposes, 3 mols of N2 are produced.

10000 mg = 10 grams

NaN3 = 23 + 3*14

NaN3 = 23 + 42

NaN3 = 65

So set up the following proportion

10 grams / 65 = x /1      Cross multiply

10 * 1 = 65 x                  Divide by 65

x = 10 / 65

x = 0.1538 moles   which is B I think

Answer:

Approximately [tex]0.110\; \rm mol[/tex].

Explanation:

Balanced equation for this reaction:

[tex]\rm PCl_5 + 4\; H_2O \to H_3PO_4 + 5\, HCl[/tex].

Look up the relative atomic mass of [tex]\rm H[/tex] and [tex]\rm Cl[/tex] on a modern periodic table:

Calculate the molar mass of [tex]\rm HCl[/tex]:

[tex]\begin{aligned}&M({\rm HCl}) \\ &= (1.008 + 35.45)\; \rm g \cdot mol^{-1} \\ &\approx 36.46\; \rm g \cdot mol^{-1}\end{aligned}[/tex].

Calculate the number of moles of molecules in that [tex]20.0\; \rm g[/tex] of [tex]\rm HCl[/tex]:

[tex]\begin{aligned}n &= \frac{m}{M} \\ &\approx \frac{20.0\; \rm g}{36.46\; \rm g \cdot mol^{-1}} \approx 0.549\; \rm mol\end{aligned}[/tex].

In the balanced reaction, the coefficient of [tex]\rm H_3PO_4[/tex] and [tex]\rm HCl[/tex] are [tex]1[/tex] and [tex]5[/tex], respectively. The ratio between these two coefficients is:

[tex]\displaystyle \frac{n({\rm H_3PO_4})}{n({\rm HCl})} = \frac{1}{5}[/tex].

In other words, this reaction would produce five times as many [tex]\rm HCl[/tex] molecules as [tex]\rm H_3PO_4[/tex] molecules.

Calculation shows that in this question, approximately [tex]0.549\; \rm mol[/tex] of [tex]\rm HCl[/tex] molecules were produced. Calculate the number of moles of [tex]\rm H_3PO_4[/tex] molecules that were produced:

[tex]\begin{aligned}& n({\rm H_3PO_4}) \\ &= n({\rm HCl}) \cdot \frac{n({\rm H_3PO_4})}{n({\rm HCl})} \\ & \approx 0.549\; \rm mol \times \frac{1}{5} \approx 0.110\; \rm mol\end{aligned}[/tex].

Answer:

186 mL HCl

Explanation:

M1V1 = M2V2

M1 = 0.215 M HCl

V1 = ?

M2 = 0.800 M NaOH

V2 = 50.0 mL

Solve for V1 --> V1 = M2V2/M1

V1 = (0.800 M)(50.0 mL) / (0.215 M) = 186 mL HCl

Answer:

The freezing point depression can be calculated using the pure solvent freezing point and the molality of the solution.

At the freezing point, the vapor pressure of both the solid and liquid form of a compound must be equal.

The freezing point of a substance is the temperature at which the solid and liquid forms are in equilibrium.

To reattain equilibrium, the freezing point of the solute and solvent mixture is lowered relative to the original pure solvent.

Answer:

4.74 g H2

Explanation:

First, balance your reaction:

N2 + 3H2 --> 2NH3

Now convert 26.7 g NH3 to moles NH3 by dividing by its molar mass (17.031 g/mol). Then multiply by the mole ratio of 3 mol H2 for every 2 mol NH3 to get moles of H2. Finally multiply by the molar mass of H2 (2.016 g/mol) to get grams of H2.

26.7 g NH3 • (1 mol NH3 / 17.031 g NH3) • (3 mol H2 / 2 mol NH3) • (2.016 g H2 / 1 mol H2) = 4.74 g H2

Answer:

Yes

Explanation:

Cause the student add wire To the flash and changed colour

Answer: Yes

Explanation: Because the color changed and one of the ways to see if a chemical reaction occured is color change.

Answer:

I think it is Greenland and Canada

Explanation:

The Taiga or boreal forest are present in the inland Canada, and Russia.

Taiga is coniferous forest, pines, spruce, and fur are common trees of this forest.

They are present in cold regions, and are adapted to survive in cold areas.

Different types of animals live in this forest, who are adapted to live in cold area, such as birds, rodents, bears, deer, moose, etc.

Siberian tiger is a native species of taiga forest, it is the world's largest cat.

Thus, the correct option is A, Canada, and E, Russia.

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