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3 years ago

What type of change forms a new substance?

1 answer:

6 0

Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions. The “ingredients” of a reaction are called reactants, and the end results are called products.

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CHEM HELP!

sweet [91]

So let's convert this amount of mL to grams:

$\frac{13.6g}{1mL}*1.2mL=16.32g$

Then we need to convert to moles using the molar weight found on the periodic table for mercury (Hg):

$\frac{1mole}{200.59g}*16.32g=8.135*10^{-2}mol$

Then we need to convert moles to atoms using Avogadro's number:

$\frac{6.022*10^{23}atoms}{1mole} *[8.135*10^{-2}mol]=4.90*10^{22}atoms$

So now we know that in 1.2 mL of liquid mercury, there are $4.90*10^{22}atoms$ present.

4 0

4 years ago

The "break-even" interest rate for year n that equates the return on an n-period zero-coupon bond to that of an n - 1 - period z

kozerog [31]

The "break-even" interest rate for year n that equates the return on an n-period zero-coupon bond to that of an n - 1 - period zero-coupon bond rolled over into a one-year bond in year n is defined as the forward rate.

A forward rate is a specified price agreed by all parties involved for the delivery of a good at a specific date in the future. The use of forward rates can be speculative if a buyer believes the future price of a good will be greater than the current forward rate. Alternatively, sellers use forward rates to mitigate the risk that the future price of a good materially decreases.

Regardless of the prevailing spot rate at the time the forward rate meets maturity, the agreed-upon contract is executed at the forward rate. For example, on January 1st, the spot rate of a case of iceberg lettuce is $50. The restaurant and the farmer agree to the delivery of 100 cases of iceberg lettuce on July 1st at a forward rate of $55 per case. On July 1st, even if the price per case has decreased to $45/case or increased to $65/case, the contract will proceed at $55/case.

To extract the forward rate, we need the zero-coupon yield curve.

We are trying to find the future interest rate $r_{1,2}}{\displaystyle r_{1,2}$ for time period

$(t_{1},t_{2})}(t_1, t_2), {\displaystyle t_{1}}t_{1$ and $t_{2}}t_{2$ expressed in years, given the rate $r_{1}}r_{1$ for

time period ${\displaystyle (0,t_{1})}(0, t_1)$ and rate $r_{2}}r_{2$ for time period ${\displaystyle (0,t_{2})}(0, t_2)$ . To do this, we use the property that the proceeds from investing at rate $r_{1}}r_{1$ for

time period ${\displaystyle (0,t_{1})}(0, t_1)$ and then reinvesting those proceeds at rate

$r_{1,2}}{\displaystyle r_{1,2}$ for time period ${\displaystyle (t_{1},t_{2})}(t_1, t_2)$ is equal to the proceeds from

investing at rate $r_{2}}r_{2$ for time period ${\displaystyle (0,t_{2})}(0, t_2)$ .

Learn more about forward rate here : brainly.com/question/28016374

#SPJ4

6 0

2 years ago

If a material, such as diamond, is very strong but gives way (ruptures) quickly when a crack forms, then it is considered _____.

kicyunya [14]

If my memory serves me well, correct answer looks like this: If a material, such as diamond, is very strong but gives way (ruptures) quickly when a crack forms, then it is considered <span>c.brittle</span>.

7 0

4 years ago

Read 2 more answers

What is difference between an ionic bond and a covalent bond?

Firdavs [7]

In an ionic bonds, ions are bonded together by the attraction of oppositely charged ions. A covalent bond is a chemical bond where electron pairs are shared between elements. Hope this helps!

5 0

3 years ago

Would aluminum be as useful as food wrapping if it had a much lower melting point? Explain your answer.

Salsk061 [2.6K]

The correct answers are as follows:

1. Aluminium will not be useful as food wrapping if it has a much lower melting point.

Aluminum is a metallic element that is malleable and soft, thus, it is easy to beat it into thin sheet, which are used to package food. The thin sheet is called aluminium foil. Aluminum is useful as a food wrapping because it has high temperature and thus, it does not react with food (the hotness of the packaged food is not capable of melting the metal). If the melting point of aluminium is lower, this implies that little temperature, such as the one from hot food will be able to melt aluminum foil, thus allowing the food to be contaminated with the metal.

2. When bleach react with fabric dye chemical change occur in the fabric.

The major element in bleach is chlorine. When laundry bleach is added to a fabric, the chlorine component of the bleach will react with the fabric dye and cause a colour change in the fabric. This type of change is called chemical change, because the original colour of the fabric can not be recovered.

3. Every substance has specific properties, which can be used to identify it. Two of such specific properties are melting point and boiling point. Melting point refers to a specific temperature at which a solid substance will melt while boiling point refers to a specific temperature at which a liquid substance will boil and turn to steam.

Water for instance has a boiling point of 100 degree Celsius. To find out if an unknown substance is water, one can determine the boiling point of such liquid. A boiling point of 100 degree Celsius will strongly signify that the substance is probably water. The same thing applies to melting point. If the specific boiling and melting point of substances are known, then they can be used to identify them.

4 0

3 years ago