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3 years ago

Science help me please :))

Chemistry

1 answer:

Alenkasestr [34]3 years ago

6 0

Answer:

There will be 2 nitrogen and 2 oxygen atoms in the product.

Explanation:

In a chemical reaction, atoms are neither created or destroyed, which means if there are 2 nitrogen atoms in the reactants, there will be 2 nitrogen atoms in the products. Similarly, if there are 2 oxygen atoms in the reactants, there will be 2 oxygen atoms in the products.

Let me know if this helps!

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A metal crystallizes with a face-centered cubic lattice. The edge of the unit cell is 417 pm. The diameter of the metal atom is:

enyata [817]

Answer:

b. 295 pm

Explanation:

To answer this question we need to use the equation of a face-centered cubic laticce:

Edge length = √8 R

<em>Where R is radius of the atom.</em>

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Replacing:

417pm = √8 R

R = 147.4pm is the radius of the atom

As diameter = 2 radius.

Diameter of the metal atom is:

147.4pm* 2 =

295pm

Right answer is:

8 0

3 years ago

According to the following reaction, how many grams of calcium sulfate will be formed upon the complete reaction of 30.1 grams o

gtnhenbr [62]

Answer:

55.32 g of CaSO₄.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

H₂SO₄ + Ca(OH)₂ —> CaSO₄ + 2H₂O

Next, we shall determine the mass of Ca(OH)₂ that reacted and the mass of CaSO₄ produced from the balanced equation. This can be obtained as follow:

Molar mass of Ca(OH)₂ = 40 + 2(16 + 1)

= 40 + 2(17)

= 40 + 34

= 74 g/mol

Mass of Ca(OH)₂ from the balanced equation = 1 × 74 = 74 g

Molar mass of CaSO₄ = 40 + 32 + (16×4)

= 40 + 32 + 64

= 136 g/mol

Mass of CaSO₄ from the balanced equation = 1 × 136 = 136 g

SUMMARY:

From the balanced equation above,

74 g of Ca(OH)₂ reacted to produce 136 g of CaSO₄.

Finally, we shall determine the mass of CaSO₄ produced by the reaction of 30.1 g of Ca(OH)₂. This can be obtained as follow:

From the balanced equation above,

74 g of Ca(OH)₂ reacted to produce 136 g of CaSO₄.

Therefore, 30.1 g of Ca(OH)₂ will react to produce = (30.1 × 136)/74 = 55.32 g of CaSO₄.

Thus, 55.32 g of CaSO₄ were obtained from the reaction.

7 0

3 years ago

Arrange the following molecules by increasing bond polarity...?

Radda [10]

The correct answer is Cl₂ <CCl₄ < PCl₃ < CaCl₂ < CsCl (most polar)

Cl₂ is nonpolar or least polar as there is no differentiation in electronegativity of the two atoms of chlorine producing amongst them. CCl₄ exhibits four C-Cl bonds. The C-atom is electropositive and Cl is electronegative. Therefore, there are four dipoles in CCl₄. Though, these dipoles cancel each other because of the tetrahedral geometry of the molecule. Therefore, CCl₄ is less polar in comparison to others, however, more polar in comparison to Cl₂.

PCl₃ exhibits three dipoles because of electronegative chlorine atoms, and electropositive phosphorus atom. Though, the configuration of the molecule is trigonal pyramidal, producing it more polar in comparison to CCl₄. The CaCl₂ is ionic compound, therefore, polar in comparison to the covalent bond compounds.

CsCl is ionic compound, however, more polar in comparison to CaCl₂, as there is the higher difference in electronegativity of Cs and Cl compared with that between the Ca and Cl.

7 0

3 years ago

A 250.0 gram block is placed on a balance. The balance measures the mass of the block as 243.9 grams. What is the percent error

adell [148]

To compute the percent error, you divide the absolute difference between the actual value and the measured value with the actual value. Then, multiply it with 100 to get the percentage. The solution is as follows:

Percent error = (250 - 243.9)/250 * 100
Percent error = 2.44%

7 0

3 years ago

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mina [271]

Answer: The answer is Fossil A is younger than the index fossil.

Explanation: Because it’s the newest layer

7 0

4 years ago