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3 years ago

(fill in the blanks) In an ionic compound, the positive ion is called

Chemistry

1 answer:

klasskru [66]3 years ago

7 0

Answer:

positive ion is a Cation while a negative ion is called an anion

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When a 3.00 g 3.00 g sample of KBr KBr is dissolved in water in a calorimeter that has a total heat capacity of 1.36 kJ ⋅ K − 1

cupoosta [38]

Answer:

Molar heat of solution of KBr is 20.0kJ/mol

Explanation:

Molar heat of solution is defined as the energy released (negative) or absorbed (Positive) per mole of solute being dissolved in solvent.

The dissolution of KBr is:

KBr → K⁺ + Br⁻

In the calorimeter, the temperature decreases 0.370K, that means the solution absorbes energy in this process. The energy is:

q = 1.36kJK⁻¹ × 0.370K

q = 0.5032kJ

Moles of KBr in 3.00g are:

3.00g × (1mol / 119g) = 0.0252moles

Thus, molar heat of solution of KBr is:

0.5032kJ / 0.0252moles = 20.0kJ/mol

3 0

3 years ago

Draw the structure of the bromohydrin formed when (Z)-3-hexene reacts with Br2/H2O. Use the wedge/hash bond tools to indicate st

Ipatiy [6.2K]

Answer:

(3R,4R)-4-bromohexan-3-ol

Explanation:

In this case, we have reaction called halohydrin formation. This is a markovnikov reaction with anti configuration. Therefore the halogen in this case "Br" and the "OH" must have different configurations. Additionally, in this molecule both carbons have the same substitution, so the "OH" can go in any carbon.

Finally, in the product we will have chiral carbons, so we have to find the absolute configuration for each carbon. On carbon 3 we will have an "R" configuration on carbon 4 we will have also an "R" configuration. (See figure 1)

I hope it helps!

5 0

3 years ago

Complete the blank with the correct answer choice. 20 kilograms = _______ grams A. 20 B. 200 C. 2,000 D. 20,000

AVprozaik [17]

Answer:

20 kg = 20000 g

Option d

Explanation:

1 kg = 1000 g

20 kg . 1000 = 20000 g

3 0

3 years ago

What is the specific heat of a 44 g piece of metal if 202 Joules of heat are required to

Ray Of Light [21]

Answer:

≈ 395,8 J/(kg * °C)

Explanation:

m = 44 g = 0,044 kg

$t_{1}$ = 22 °C

$t_{2}$ = 33,6 °C

Q = 202 J

The formula is: Q = c * m * ( $t_{2} - t_{1}$ )

c = $\frac{Q}{m * (t_{2} - t_{1} )}$

Calculating:

c = 202 J / 0,044 kg * (33,6 °C - 22 °C) ≈ 395,8 J/(kg * °C)

4 0

3 years ago

In what way does the shape of a molecule affect how the molecule is involved with living systems?

galina1969 [7]

In what way does the shape of a molecule affect how the molecule is involved with living systems?

A. It determines the weight of a molecule

B. it determines what elements are in a molecule

C. it determines oxidation states present in a molecule

D. it determines how the molecule functions

It should be d

3 0

3 years ago