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4 years ago

Iron is ___ A, FE B,CU C,K D, CA

Chemistry

2 answers:

Fiesta28 [93]4 years ago

5 0

Answer:

Ello mate ! the answer is super simple it's option "A" Fe

Explanation:

Iron is a chemical element with symbol "Fe" and atomic number 26. It is a type of metal, that belongs to the first transition series and group 8 of the periodic table. It is by mass the most common element on Earth, forming much of Earth's outer and inner core.

choli [55]4 years ago

4 0

Iron is FE. So you should select A

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calculate the molality of commercial HCl solution which is 12.1Molarity, and has a density of 1.19g/mL, and is 37.2wt.%HCl.

shutvik [7]

Answer:

0.44165 Molal

8 0

4 years ago

When the equation below is balanced with the smallest possible integer coefficients, what is the coefficient for PH3?

Vikki [24]

Answer:

The coefficient for PH3 is 8. Option D is correct.

Explanation:

Step 1: The unbalanced equation

P2H4(g) ⇆ PH3(g) + P4(s)

Step 2: Balancing the equation

P2H4(g) ⇆ PH3(g) + P4(s)

On the left side we have 4x H (in P2H4), on the right side we have 3x H (in PH3). To balance the amount of H on both sides, we have to multiply P2H4 on the left side by 3 and PH3 on the right by 4.

3P2H4(g ) ⇆ 4PH3(g) + P4(s)

On the left side we have 6x P (in 3P2H4) on the right side we have 8x P (4x in 4PH3 and 4x in P4). To balance the amount of P on bot hsides, we have to multiply 3P2H4 by 2 and 4PH3 also by 2. Now the equation is balanced

6P2H4(g ) ⇆ 8PH3(g) + P4(s)

The coefficient for PH3 is 8. Option D is correct.

5 0

4 years ago

One of the essences of chemistry is searching for solution to the problem of mankind.

Rudiy27

False

Explanation:

because every problem of a mankind has a solution

6 0

3 years ago

Which statement related to particle and wave properties of matter is correct? a. Interference patterns are observed when a wave

DerKrebs [107]

Answer:

a. Interference patterns are observed when a wave passes through a barrier with two slits

Explanation:

Interference is a situation where two waves superimpose to form a new wave of a different amplitude. This amplitude can be greater, same or lower.

the diagram attached below shows the movement of a wave through a barrier with two slits.

you can notice the portions of the wave that overlap. This overlapping of waves is the interference.

Thus, option A is correct.

The other options however, are not correct. as shown below:

Option B is wrong as waves exhibit diffraction (it is diffraction of the light wave that produces the rainbows we see in the sky)

Option C is wrong as waves do not travel straight through slits always.

Option D is wrong as waves can also interfere constructively and destructively.

7 0

4 years ago

Mg + H2O → Mg(OH)2 + H2

Ilya [14]

Mg + 2️⃣H20 ➡️ Mg(OH)2 + H2

3 0

3 years ago