All categories

3 years ago

Someone please help me with question 4 ! EXTRA POINTS

Chemistry

2 answers:

Aleks04 [339]3 years ago

6 0

1. B
2. C
3. A
That should do it

Elden [556K]3 years ago

6 0

Cell Wall- B

Vacuole- C

Chloroplast- A

You might be interested in

How does the density of one penny compare with the density of two pennies

Mice21 [21]

Density increases.......

6 0

3 years ago

Which of the following definitions characterizes an element?

Amanda [17]

The answer is A because an elements only consists of one type of atom. Example. the element H (hydrogen) only contains 1 hydrogen atom. I hope this helps!!

6 0

3 years ago

Arrange the elements in decreasing order of first ionization energy.

just olya [345]

Answer:

The decreasing order of first ionization energy: Se > Ge > In > Cs

The decreasing order of first ionization energy: x > y > z

Explanation:

Ionization energy refers to the energy needed to completely pull out an electron from the valence shell of a neutral gaseous atom.

First ionization energy is the energy involved in the removal of first valence electron.

In the periodic table, down the group, as atomic radius of elements increases, the ionization energy decreases

Whereas, across a period, as atomic radius of elements decreases, the ionization energy increases.

PART (A):

Position of the given elements in the periodic table:

Indium (In): Group 13, period 5

Germanium (Ge): Group 14, period 4

Selenium (Se): Group 16, period 4

Caesium (Cs): Group 1, period 6

Thus, the increasing order of atomic radius: Se < Ge < In < Cs

Therefore, the decreasing order of first ionization energy: Se > Ge > In > Cs

PART (B):

Given elements:

element x: radius = 110 pm

element y: radius = 199 pm

element z: radius = 257 pm

Thus, the increasing order of atomic radius: x < y < z

Therefore, the decreasing order of first ionization energy: x > y > z

5 0

3 years ago

What type of plate boundary is shown in the diagram below?

ryzh [129]

Answer : The second one

8 0

2 years ago

When methane, CH4, is combusted, it produces carbon dioxide, CO₂, according to the unbalanced equation: CH4 +0₂ - CO₂ + H₂O.

nevsk [136]

The balanced equation will be $CH_4 + 2O_2 --- > CO_2 + 2H_2O$

<h3>Stoichiometric problems</h3>

The balanced equation of the reaction would be as follows:

$CH_4 + 2O_2 --- > CO_2 + 2H_2O$

The mole ratio of methane to carbon dioxide is 1:1.

10 grams of methane will give 10/16 = 0.625 moles

0.625 moles of carbon dioxide would give 0.625 x 44.01 = 27.506 grams.

Thus, 10 grams of methane will produce approximately 27 grams of carbon dioxide stoichiometrically.

The reaction obeys the law of conservation of mass because the atoms of all the elements before and after the reaction are balanced.

More on stoichiometric problems can be found here: brainly.com/question/14465605

#SPJ1

3 0

2 years ago