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mars1129 [50]
3 years ago
8

A physical change is when the atoms combine to create a new product.

Chemistry
1 answer:
Tasya [4]3 years ago
8 0
False. A physical change does not create a new substance.
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Ionic compounds can conduct electricity when dissolved in water or melted, because A. they have shared electrons. B. they have n
liberstina [14]
So,

Ionic compounds are compounds composed of ions.  The following are soluble ionic compounds (they dissolve in water):

NaCl(s) --> Na⁺(aq) + Cl⁻(aq)
NaOH(s) --> Na⁺(aq) + OH⁻(aq)

The following are insoluble ionic compounds (they have low solubilities):

Al₂O₃ --> 2Al³⁺+3O²⁻
AgCl --> Ag⁺ + Cl⁻

These compounds can only be appreciably separated by melting or by dissolving them in enormous amounts of water (the concentration will still be very low).

Ionic compounds have electrons that are locked in place because of the strong ionic attractions between the ions.  A charge is produced by moving electrons.  Since the ions in melted ionic compounds are free to move, their electrons are no longer locked, allowing the ionic liquid to conduct electricity.

NaCl(s) --> Na⁺(l) + Cl⁻(l)

The answer is D.
6 0
3 years ago
2. Which organelle holds genetic information in the molecule DNA? A. vacuole B. cell membrane C. chromosome D. Golgi body
malfutka [58]
B.cell membrane is the answer
7 0
4 years ago
Read 2 more answers
The reform reaction between steam and gaseous methane (CH4) produces "synthesis gas," a mixture of carbon monoxide gas and dihyd
kenny6666 [7]

Answer:

The answer is "= 0.078 \ kg \ H_2".

Explanation:

calculating the moles in CH_4 =\frac{PV}{RT}

                                                =\frac{(0.58 \ atm) \times (923 \ L) }{ (0.0821 \frac{L \cdot atm}{K \cdot mol})(232^{\circ} C +273)}\\\\=\frac{(535.34 \ atm \cdot \ L) }{ (0.0821 \frac{L \cdot atm}{K \cdot mol})(505)K}\\\\=\frac{(535.34 \ atm \cdot \ L) }{ (41.4605 \frac{L \cdot atm}{mol})}\\\\= 12.9 \ mol

Eqution:

CH_4 +H_2O \to  3H_2+ CO \ (g)

Calculating the amount of H_2 produced:

= 12.9 \ mol CH_4 \times  \frac{3 \ mol \ H_2 }{1 \ mol \ CH_4}\times \frac{2.016 g H_2}{1 \ mol \ H_2}\\\\= 78 \ g \ H_2 \\\\= 0.078 \ kg \ H_2

So, the amount of dihydrogen produced = 0.078 \frac{kg}{s}

5 0
3 years ago
What is the molarity of a solution that contains 0.400 mol HCI in 9.79 L solutions ​
USPshnik [31]

Molarity's formula is known as: Molarity(M)=moles of solute/liters solution.

In this case we are already given moles and liters so you just have to plug the numbers into the equation.

0.400 mol HCL/9.79L solution=0.040858M

If you were to use scientific notation, the answer will be: 4.1*10^-2, but otherwise, you can just use the decimals above and round appropriately as you see fit.

6 0
3 years ago
Which atoms are most likely to form + 1 ion and -2 ion respectively?
yarga [219]
D. Ba and F. Took the test
7 0
3 years ago
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