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murzikaleks [220]
3 years ago
14

Pure substances can be broken down through both chemical and physical changes

Chemistry
1 answer:
Alona [7]3 years ago
8 0

Answer:

True, yes

Explanation:

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Suppose you have a solution that might contain any or all of the following cations: Cu 2, Ag , Ba 2, and Mn2 . The addition of H
SVEN [57.7K]

Answer:

Ag⁺, Ba²⁺,

Explanation:

We can solve this question using the <em>solubility rules:</em>

<em>When an Halide as Br- is added to a solution, the ions that can be precipitate are Ag⁺, Hg₂²⁺ and Pb²⁺.</em>

That means the first ion present is Ag⁺

<em>When sulfates, SO₄²⁻ are added, the ions that precipitates are: Ag⁺, Ca²⁺, Sr²⁺, Ba²⁺, Hg₂²⁺ and Pb²⁺</em>

The second ion present is Ba²⁺

Hydroxides of Cu²⁺ and Mn²⁺ are insolubles but as no precipitate are formed when the solution is strongly alkaline those ions are not present.

3 0
3 years ago
How many moles are there in 545g of Fe2O3 ?
Salsk061 [2.6K]
To calculate the number of moles, the equation is mass of substance divided by the molar mass of substance.

Molar mass of Fe2O3 is the relative atomic mas of all the elements from the substance added up, which makes 55.845x2 + 16.0 x3 = 159.69g mol-1

So the number of moles is
545g / 159.69gmol-1
=3.41 mol (corrected to 3 sig. fig.)
6 0
3 years ago
Determine the concentration of H+ ions in an aqueous solution where [OH-] =2.25 × 10^-4 M. I have 29 minutes I beg u guys pls hu
mixas84 [53]

but where Is the volume in order for us to determine the concentration. since we have moles in H+ ions

then you can say

concentration = M*1000/V

6 0
3 years ago
Nitrogen and hydrogen react to produce ammonia. What mass of ammonia could be produced from 500 grams of nitrogen? Assume that e
OlgaM077 [116]
The answer is 607g. the working is shown above.

5 0
3 years ago
Vincent combines sodium and chlorine in two different beakers (beaker X and beaker Y). In both beakers, the chemical reaction sh
Elza [17]

Answer: A. the chemical change will occur faster in beaker X.

Explanation:

Temperature is one of the factors that affect the rates of chemical reactions. Increase in temperature increases the rates of reaction by increasing the kinetic energy of the reacting particles so that energetic collisions occur and more bonds in the reactants will be broken and; atoms and ions recombine to form new compounds. Beaker X which is at room temperature has higher temperature than beaker Y which is kept in the refrigerator, thus reacting particles in beaker X has more kinetic energy than the ones in beakerA. the chemical change will occur faster in beaker X. Y.

8 0
4 years ago
Read 2 more answers
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