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romanna [79]
3 years ago
8

A. On the Periodic Table of Elements, columns are called ______________________; all of these

Chemistry
2 answers:
Anestetic [448]3 years ago
7 0
1. Groups
2. They have the same number of electrons in their outer shell
3. Periods
4. They have the same number of shells
Vesnalui [34]3 years ago
4 0

Answer:

A. On the peridic table of elemets, columns are called groups; all of these elements have the same number of electrons in the outer orbital.

B. On the periodic table of elements, rows are called periods; all of these have the same number of atomic orbitals.

<em>I think this is right sorry if i'm wrong!</em>

<em></em>

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An erlenmeyer flask contains 15.00mL of 0.030 M HCI before titration. 5.00 mL of 0.050 of M NaOH is added to the HCI in the flas
e-lub [12.9K]

Answer:

1.1

0.050*0.005

0.00025

Explanation:

8 0
3 years ago
What structure what structural feature of cells can allow molecules to flow directly from the inside of one cell to the inside o
Rufina [12.5K]
The answer is A. Plasmodesmata. It's a narrow pathway between cells.
3 0
3 years ago
How many times greater is the hydronium ion concentration in rainfall (pH = 5.0) compared to pure water (pH = 7.0)?
joja [24]
Hydronium ion is H3O(+)

pH is log 1 / [H3O(+)] = - log [H3O(+)]

Rainfall: pH = 5.0 = - log [H3O(+)] => [H3O(+)] = -antilog (- 5.0) =  10^-5

Water; pH = 7.0 = - log [H3O(+)] => [H3O(+)] = - antilog (-7.0) = 10^ -7

Divide hidronium conentration of rainfall by hidrodium concentration of water:

10^-5 / 10^-7 = 10^2 = 100.

Then, hidronium concentration in rainfall is 100 times hidronium concentration in water.

Answer: option a. 100 times.
3 0
3 years ago
A cable raises a mass of 158.0 kg with an acceleration of 1.8 m/s2. What force (in N) of tension is in the cable?
ki77a [65]

Answer:

Force of Tension = 1832.8  N

Explanation:

Any mass of object supported or pulled by a rope or cable  is subject to a force of tension. Since the mass is raised by a cable, tension is involved.

Mathematically,

Tension = mass × gravity(9.8 m/s²)

Tension can be represented as

T = (m × g) + (m × a)

Where g is the acceleration due to gravity of the object the cable is supporting and a is the acceleration on the object the cable is supporting. And m is the mass of the object.

mass = 158 kg

a = 1.8 m/s²

g = 9.8 m/s²

T = mg + ma

T = m(g + a)

T = 158(9.8 + 1.8)

T = 158 × 11.6

T = 1832.8  N

8 0
3 years ago
Which of these substances are greenhouse gases? Check all that apply. Oxygen carbon dioxide helium methane nitrous oxide.
taurus [48]

The greenhouse gases are carbon dioxide, methane, and nitrous oxide.

The greenhouse effect has been defined as the entrapment of the sun's energy by the gases that result in the earth becoming warmer and a better place to live.

The gases present in the atmosphere that has been able to entrap the heat energy has been termed the greenhouse gases.

The greenhouse gases have been carbon dioxide, methane, and nitrous oxide.

For more information about  greenhouse gases, refer to the link:

brainly.com/question/11595872

3 0
3 years ago
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