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Rama09 [41]
4 years ago
13

Steve uses clay to model the law of

Chemistry
1 answer:
pickupchik [31]4 years ago
3 0
The law of conservation of matter states that for any system closed to all transfers of matter in energy, the mass of the system must remain constant over time.

In other words, it doesn’t really matter what shape the thing is, it will always have the same mass unless you take some of the shape away or add more of it

The correct answer would be B, the shape changed but the mass is the same

I hope this helps!! <3
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If 190.5 grams of copper metal reacts, how many grams of silver metal will be produced?
Lubov Fominskaja [6]

Answer:

646.8 g

Explanation:

It really depends what salt silver cation makes in the context of this problem. In this problem, we have a single displacement reaction in which copper metal displaces silver cation from a salt to produce silver metal. Based on the charge of the anion in the salt, we may have differently balanced chemical equations.

Since silver cation mostly makes insoluble salts and we need a soluble one for a single displacement reaction, we'll use silver nitrate as our example, as it's the most common soluble silver salt. We have the following reaction:

Cu(s)+2AgNO_3(aq)\rightarrow Cu(NO_3)_2(aq)+2 Ag(s)

Notice that 1 mole of copper reacts to produce 2 moles of silver. This may be mathematically written as:

\frac{n_{Cu}}{1}=\frac{n_{Ag}}{2}

Express moles as a ratio between mass and molar mass:

\frac{m_{Cu}}{M_{Cu}}=\frac{1}{2}\cdot\frac{m_{Ag}}{M_{Ag}}

Rearrange the equation for the mass of silver metal:

m_{Ag}=\frac{2m_{Cu}}{M_{Cu}}\cdot M_{Ag}

Substitute the given data:

m_{Ag}=\frac{2\cdot 190.5 g}{63.546 g/mol}\cdot 107.87 g/mol = 646.8 g

6 0
3 years ago
Choose the statement that does not apply to chemical reactions
n200080 [17]

Answer:

I think the answer to the question is c

4 0
3 years ago
Why is saturated sodium chloride solution (also known as brine) used?
charle [14.2K]
B is the answer 
<span>least 20 characters </span>
6 0
3 years ago
A car moves with an average speed of 45miles /hour. How long does the car take to travel 90miles?
storchak [24]

Averqge speed of the car = 45 miles/hr, which means,

The car travels 45 miles in 1 hr.

Using unitary method,

The car travels 45 miles in 1 hr

The car would travel 1 mile in 1/45 hrs

The car would travel 90 miles in 1/45×90 hrs

So, calculating this,

1/45×90 = 2 hrs

3 0
3 years ago
Read 2 more answers
Directions: Name each of the following compounds. If a name is given, write the formula.
dsp73

Answer:

1. Sodium Oxide

2. Barium Sulfide

3. Copper (II) sulfate

4. Mercury (II) chloride

5. Silver Nitrate

6. CuO

7. FeCl3

8. Zn (NO3)2

9. Mg (OH)2

10. SnS

5 0
3 years ago
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