CHEMISTRY HIGH SCHOOL

Which substance is NOT a compound?a. salt
b. sodium
c. pure water
d. carbon monoxide

Answers

Answer 1
Answer:

Among the given ones, sodium is not a compound. The correct option is b.

What is a compound?

The substance that is formed by union of different elements is referred to as a compound.

For instance, salt is made up of sodium and chloride, water have hydrogen and oxygen, etc.

Thus, the correct option is b.

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Answer 2
Answer: b, sodium because if you look at your periodic table it is the only element not compounded with another 

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Which is not true of binary compounds?

What is true of an Arrhenius acid?a. An Arrhenius acid donates OH- ions.
b. An Arrhenius acid donates H+ ions.
c. An Arrhenius acid accepts H+ ions.
d. An Arrhenius acid accepts OH- ions.

Answers

The substances such as HCl, HNO₃, etc. are Arrhenius acids whereas the substances like NaOH, KOH, etc. are Arrhenius bases. An Arrhenius acid donates H⁺ ions. The correct option is B.

According to Arrhenius, an acid is defined as a substance which dissociates to give hydrogen ions in aqueous solution and base is a substance which dissociates to give hydroxyl ions in aqueous solution.

So the Arrhenius acid ionize in water to give H⁺ ions and Arrhenius base ionize in water to form OH⁻ ions.

Thus Arrhenius acid is option B.

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B, An Arrhenius acid donates H+ ions.

There are three stable atoms of Argon (Atomic Number 18): Argon-36, Argon-38 andArgon-40. What would the atoms of these isotopes have in common? What would
be different about their atoms? (4 points)
HELP ASAP

Answers

On the periodic table, argon has an average atomic weight of 39.948 amu. This number is really near 40. This suggests that Ar-40 is the isotope of argon (Ar) that is most prevalent in the natural world.

What characteristics do argon-36, argon-38, and argon-40 share?

If all three argon atoms are neutral, they would each contain 18 protons and 18 electrons. In comparison to one another, the three isotopes will each have a distinct number of neutrons (18, 20, and 22 neutrons respectively).

Why is potassium a 39 positioned before argon, atomic number 40, in the current periodic table?

Atomic number, not atomic mass, is used to categorise the elements. As the atomic number of argon (18) is less than that of potassium (19)

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Need help with this equation! Can anybody lay out an answer please?Use this equation; 4Fe + 3O2 -> 2Fe2O3.
If 96.0 grams of oxygen react, what mass of iron was oxidized?

A.) 32.0 g
B.) 96.0 g
C.) 167 g
D.) 223 g

Thanks!

Answers

As you can see in the reaction, for each 3O_2 that reacts, two Fe_2O_3 are created.

There are (96.0)/(16)=6mol of oxygens reacting, hence 2*6/3=4 mols of iron will be oxidized, which represents 24*55.8=\boxed{223g}

Select all (there's more than one) of the below chemicals that would be insoluble in water.a
NH4OH

b
NaNO3

c
PbCrO4

d
SrSO4

e
K3PO4

f
AgClO4

g
HgCl2

h
FeCO3

i
NH4Br

j
Li2Cr2O7

Answers

FeCO₃ and PbCrO₄ is insoluble in water.

Explanation:

If any substance added to water and it form ions then it is soluble in water otherwise it is insoluble in water.

a. NH₄OH - soluble in water

b. NaNO₃ - soluble in water

C. PbCrO₄ is insoluble in water

d. SrSO₄ slightly soluble in water

e. K₃PO₄ - Soluble in water

f. AgClO₄- Highly Soluble in water

g. HgCl₂ - Slightly soluble in water

h. FeCO₃ -  insoluble in water

i. NH₄Br - soluble in water

j. Li₂Cr₂O₇ - soluble in water

What is not an example of a. Catalyst

Answers

The combustion of coal

HELP WILL REWARD BRAINLIESTMark each Saturated or Unsaturated
2.00 g of PbCl2 at 80°C

100.2 g of NaNO3 at 60°C

128 g of KI at 0°C

75.5 g of LiCl at 20°C

8.22 g of Ba(OH)2 at 40°C

Answers

Answer:

1) unsaturated

2) unsaturated

3) saturated

4) unsaturated

5) saturated

Explanation:

A solution with solute that dissolves until it is unable to dissolve anymore, leaving the undissolved substances at the bottom., is called saturated. Each solution has a certain amount of mass that can dissolve at certain temperature.

A solution with less solute than the saturated solution, that completely dissolves, leaving no remaining substances., is called unsaturated.

A solution ,with more solute than the saturated solution, that contains more undissolved solute than the saturated solution, is called oversaturated.

A) 2.00 g of PbCl2 at 80°C

⇒ At 80 °C this solution is saturated when there is 2.54 grams of PbCl2 in solution

2.00 < 2.54   This solution is unsaturated

B) 100.2 g of NaNO3 at 60°C

⇒ At 60 °C this solution is saturated when there is 122 grams of NaNO3 in solution

100.2 < 122

This solution is unsaturated

C) 128 g of KI at 0°C

⇒ At 0 °C this solution is saturated when there is 128 grams of KI in solution

This solution is saturated

D) 75.5 g of LiCl at 20°C

⇒ At 20 °C this solution is saturated when there is 83.5 grams of LiCl3 in solution

75.5 < 83.5

This solution is unsaturated

E) 8.22 g of Ba(OH)2 at 40°C

⇒ At 40 °C this solution is saturated when there is 8.22 grams of Ba(OH)2 in solution

This solution is saturated
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