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3 years ago

What are the 3 most valuable metals in the United States? A. Lead b. Gold c. Iron d.Copper e.Coal f.Silver g.Titanium

Chemistry

1 answer:

shepuryov [24]3 years ago

5 0

Answer:

Gold, Silver and Titanium

Explanation:

The most valuable metals in the list are:

Gold:

Its value makes it a good investment option. Gold can be used in many different ways, like in jewelry, electronics, medicine, etc.

Silver:

Similar to the case of gold, besides the common value of silver in jewelry, it can be also used in other ways, because it has a large thermal and electrical conductivity.

Finally, the titanium: It's price is actually close to the copper one, but for the cost of work with titanium (Titanium has a really large melting point, then melting it into ingots needs a lot of energy), the price of titanium is increased.

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Which metal is more active than tin, but less active than zinc

VikaD [51]

Answer:

Iron (Fe)

Explanation:

The reactivity series shows a series of metals reactivity from lowest to highest. Based on the arrangement of metals in the reactivity series, iron is placed above tin and below zinc, this means that iron is more reactive than tin but less reactive than zinc. This means that iron would displace tin ions in a solution whereas zinc would displace iron ions in a solution.

The reactivity of metals is due to the stability of metals in their electron configurations as atoms and as ions.

8 0

3 years ago

How do you do Calorimetry? We've had it in class for about a week and I still don't understand it so does anyone have any simple

Ede4ka [16]

It basically works like this:

You dry out the food

put it in this ceramic oven thingy surrounded with water

burn the food

the water will heat up

measure the water temperature in f

= calories

Calorimetry is the science or act of measuring changes in state variables of a body for the purpose of deriving the heat transfer associated with changes of its state due, for example, to chemical reactions, physical changes, or phase transitions under specified constraints.

in this case, you're finding the amount of energy is contained within it when combusted

8 0

3 years ago

Instead of collecting gas with a syringe, another method involves: • Submerging the evidence in a special agent • Placing a stri

kirza4 [7]

Using a tiny vacuum

3 0

3 years ago

A teacher moves a box of books weighting 25lbs a distance of 40ft. How much work has she done?

svp [43]

Answer:

$workdone = weight \: \times \: distance \\ = 25 \times 40 \\ = 1000 \: lbsft \\ or \\ = 1000 \: joules$

6 0

3 years ago

A sample of impure tin of mass 0.540 g is dissolved in strong acid to give a solution of Sn2+. The solution is then titrated wit

pychu [463]

Answer:

The sample has 50% tin

Explanation:

Step 1: Determine the (half) reactions

Sn(s) → Sn2+(aq)

NO3-(aq) →NO(g)

Step 2: Balance the Oyxgen atoms by adding H+

4H+ NO3- → NO + 2H2O(l)

4H+(aq) + NO3-(aq) -→ NO(g) + 2H2O(l)

Step 3: Balance the charges by adding electrons

Sn(s) → Sn2+(aq) +2e-

4H+(aq) + NO3-(aq) +3e-→ NO(g) + 2H2O(l)

Step 4: To balance the 2 equations we should multiply the first reaction by 3; and multiply the second reaction by 2

3 Sn(s) → 3 Sn2+(aq) +6e-

8H+(aq) + 2 NO3-(aq) +6e-→ 2 NO(g) + 4H2O(l)

3Sn + 8H+ +2NO3- → 3Sn2+ + 2NO +4H2O

Step 5: Calculate moles of NO3-

Moles of NO3- = 0.0448 M * 0.0339 = 0.00152 moles

Step 6: Calculate moles of Sn

As we can see in the balanced equation, for 2 moles of NO3- Consumed, we need 3 moles of Sn to consume.

This means that for 0.00152 moles of NO3- we need 0.00152 * (3/2) = 0.00228 moles of Sn

Step 7: Calculate mass of Sn

mass of Sn = moles of Sn * Molar mass of Sn

mass of Sn = 0.00228 moles * 118.71g/mole = 0.27 grams

Step 8: Calculate the mass %

(0.27g / 0.54g) * 100 % = 50%

The sample has 50% tin

8 0

3 years ago