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3 years ago

Who can help me on this one ?

Chemistry

1 answer:

Bogdan [553]3 years ago

6 0

Answer:

eight strong bonds to the atoms that it touches and six weaker bonds to the atoms it almost touches. This makes it easier to understand why a metal might prefer the body-centered cubic structure to the hexagonal or cubic closest-packed structure.

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When exposed to very high temperature metals like iron can be turned into fluids that flow and can be poured into molds what hap

Rudik [331]

Answer:

Explanation:

7 0

3 years ago

To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 4.6-L bulb, then filled

snow_tiger [21]

Answer:

The chemical formula of the gas is $N_2$ .

Explanation:

The difference between the container with gas and empty container is equal to the mass of the gas.

Let the gas be $X_2$

Mass of the gas = m

Molar mass of diatomic gas = M

Pressure of the gas = P = 1.80 atm

Volume of the gas = V = 4.6 L

Temperature of the gas= T = 27.0 C = 27.0 + 273 K = 300 K

Moles of diatomic gas = n = $\frac{m}{M}$

Using ideal gas equation:

$PV=nRT$

$PV=\frac{m}{M}RT$

$M=\frac{mRT}{PV}=\frac{9.5 grams \times 0.0821 atm L/mol K\times 300 K}{1.80 atm\times 4.6 L}=28.26 g/mol\approx 28 g/mol$

Atomic mass of the element X = $\frac{28 g/mol}{2}=14 g/mol$

The element is nitrogen and the diatomic gas is $N_2$ .

5 0

3 years ago

A buffer solution contains 0.11 mol of acetic acid and 0.13 mol of sodium acetate in 1.00 L. What is the pH of this buffer?

aleksley [76]

Answer:

Henderson Hasselbalch equation: pH = pKa + log [salt]/[acid]

You need to know the pKa for acetic acid. Looking it up one finds it to be 4.76

(a). pH = 4.76 + log [0.13]/[0.10]

= 4.76 + 0.11

= 4.87

(b) KOH + CH3COOH =>H2O + CH3COOK so (acid)goes down and (salt)goes up. Assuming no change in volume, you have 0.10 mol acid - 0.02 mol = 0.08 mol acid and 0.13 mol salt + 0.02 mol = 0.15 mol salt

pH = 4.76 + log [0.15]/[0.08]

= 4.76 + 0.27

= 5.03

5 0

4 years ago

Do you think creativity can contribute to scientific inquiry and investigation? Provide an example and explain your answer.

frez [133]

Creativity is often defined as the ability to generate innovative ideas and manifest them from thought into reality. Any science experiment that is being done for the first time is creative because it's an innovative idea that's being transformed into reality by creating/doing the experiment.

8 0

4 years ago

Dustin is mixing concrete. A formula for concrete calls for 3/8 gal of water. Dustin wants to make 7/9 more concrete than the fo

slava [35]

We can use a ratio to solve this question. Lets refer to the amount formed by the formula as a serving
1 serving needs 3/8 gal
We want to create 7/9 servings extra, so
1 + 7/9 = 16/7
1 : 3/8
16/7 : x
1/(3/8) = (16/7) / x
8 / 3 = 16x / 7
x = 7/6
He needs to use 7/6 gallons of water.

5 0

3 years ago