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Leya [2.2K]
3 years ago
9

What element is used in bright flashing advertising signs

Chemistry
1 answer:
Sergeu [11.5K]3 years ago
4 0
The element used in advertising signs is neon.
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Carbon dioxide (CO2) is a gas at room temperature and pressure. However, carbon dioxide can be put under pressure to become a "s
Lunna [17]

Answer:

The mass of this 25 mL supercritical CO2 sample has a mass of 11.7g

Explanation:

Step 1: Given data

The supercritical CO2 has a density of 0.469 g/cm³ (or 0.469 g/mL)

The sample hasa volume of 25.0 mL

Step 2: Calculating mass of the sample

The density is the mass per amount of volume

0.469g/cm³ = 0.469g/ml

The mass for a sample of 25.0 mL = 0.469g/mL * 25.0 mL = 11.725g ≈ 11.7g

The mass of this 25 mL supercritical CO2 sample has a mass of 11.7g

5 0
3 years ago
Im doing a science project and need examples and non-examples of an Atom. some examples of an atom is neon, hydrogen, argon, etc
gogolik [260]

Answer:

Anything not on the periodic table is an element non example! ... So, for a substance to be an element, all of its atoms must have the same number of protons. Examples of elements include hydrogen, lithium, nickel, and radium.

Explanation:

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3 years ago
Please Help!!!!!!!!!!!!!!!!!!!!
Alekssandra [29.7K]

Answer: first one

Explanation:

5 0
3 years ago
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Which of the following is ignored when determining the relative mass of atoms? (2 points)
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The atomic mass is determined by the number of protons and neutrons in a atoms for example oxygen has eight protons and neutrons which gives oxygen and atomic mass of 16
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One important function of the atmosphere is to provide the Earth and its people with the water needed for life.
exis [7]
False because that’s not it’s function
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