All categories

3 years ago

These questions are based on the attached photo. The experiment is about burning magnesium metal with oxygen.

Chemistry

1 answer:

Annette [7]3 years ago

4 0

did you ever get the answers for these ??

You might be interested in

Calculate the amount of heat needed to boil 159.g of water

MissTica

Okay I did the math and I'm guessing around 18*C

5 0

3 years ago

10. If 3.5 kJ of energy are added to a 28.2 g sample of iron at 20°C, what

igor_vitrenko [27]

Answer:

569K

Explanation:

Q = 3.5kJ = 3500J

mass = 28.2g

∅1 = 20°C = 20 + 273 = 293K

∅2 = x

c = 0.449

Q = mc∆∅

3500 = 28.2×0.449×∆∅

3500 = 12.6618×∆∅

∆∅ = 3500/12.6618

∆∅ = 276.4220

∅2 - ∅1 = 276.4220

∅2 = 276.4220 + ∅1

∅2 = 276.4220 + 293

∅2 = 569.4220K

∅2 = 569K

3 0

3 years ago

A 10.0 mL sample of calcium hydroxide solution required 26.85 mL of 0.225 M hydrochloric acid for neutralization. The balanced e

xxMikexx [17]

Answer:

$C_{base}=0.302M$

Explanation:

Hello,

In this case, we can evidence that when calcium hydroxide solution reacts with hydrochloric acid solution, the balanced neutralization reaction turns out:

$2HCl(aq)+Ca(OH)_2\rightarrow CaCl_2(aq)+2H_2O(l)$

Moreover, the concentration of neutralized calcium hydroxide can be computed by using the 2:1 mole ratio between the base and the acid:

$C_{acid}V_{acid}=2*C_{base}V_{base}\\\\C_{base}=\frac{C_{acid}V_{acid}}{2*V_{base}} =\frac{0.225M*26.85mL}{2*10.0mL}\\ \\C_{base}=0.302M$

Regards.

6 0

3 years ago

Name the following compound: CH3 – CH2 – CH2 – CH2 – CH3

Oliga [24]

Answer:

Pentane

Explanation:

6 0

3 years ago

Why would a line graph be better to show the relationship between predator and prey birds in an ecosystem than a circle graph?

Murrr4er [49]

Answer:

Explanation:

Line graphs are better to show the relations between over time, as circle shows the amount or present of something in a cert time

7 0

3 years ago