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3 years ago

6

Suppose a thermometer has marks at every one degree increment and the mercury level on the thermometer is exactly between the 25

and 26 degree Celsius marks. We should properly report the temperature measurement as:

1 answer:

alekssr [168]3 years ago

5 0

Answer: 25.5°C

Explanation: take the average of the reading i.e (25 + 26)/2= 25.5

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The periodic table is based on an element's

nasty-shy [4]

Answer:

Atomic number

Explanation:

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3 years ago

What does atomic mass on the periodic table represent?

neonofarm [45]

The atomic mass on the periodic table represents the sum of number of protons and number of neutrons.

Atomic mass = Number of protons + number of neutrons

Hope this helps!

6 0

3 years ago

Give the Unabbreviated electron configuration for barium

Shalnov [3]

Answer:

Ba: 1s² 2s²2p⁶ 3s²3p⁶ 4s²3d¹⁰4p⁶ 5s²4d¹⁰5p⁶ 6s²

Step-by-step explanation:

Step 1. Locate barium in the Periodic Table.

It's in Period 6, Group 2: Element 56 (highlighted blue in the Periodic Table below).

Step 2. Add 54 electrons to the energy levels

You add then in the order shown in the diagram below.

The complete electron configuration is:

Ba: 1s² 2s²2p⁶ 3s²3p⁶ 4s²3d¹⁰4p⁶ 5s²4d¹⁰5p⁶ 6s²

n = 2 + 8 + 8 + 18 + 18 + 2 = 56

8 0

3 years ago

12. When a chlorine atom forms an ion its radius increases, but when a sodium atom forms an ion its radius decreases. Explain th

Lana71 [14]

Explanation:

When a chlorine atom forms an ion, it gains electrons, making it negative. A neutral chlorine will become a chlorine with a -1 charge. When it gains an electron, the radius increases.

When a sodium atom forms an ion, it loses electrons, making it positive. A neutral sodium will become a sodium with a +1 charge. When it loses an electron, the radius decreases.

4 0

3 years ago

A 0.500 g sample of a gas has a pressure of 0.230 atm at 25.0 °C in a 0.750 L bulb. What is the molar mass of the gas?

ANTONII [103]

The molar mass of the gas is 0.04192 M.

<h3>What is molar mass?</h3>

Molar mass is the actual weight of any element or chemical compound.

The mass of the sample is 0.500 g

The pressure is 0.230

The temperature is 25.0 C

The volume is 0.750 L

Step1 – calculate the moles

$PV = nrt\\\\0.230 \times 0.750 = n \times 0.0823 \times25.0\\n = \dfrac{0.0823 \times25.0}{0.230 \times 0.750} = 11.927\;mol$

Step2 – calculate the molar mass

$\rm Molar\;mass = \dfrac{mass}{number\;of\;moles} \\\\\rm Molar\;mass = \dfrac{0.500}{11.927} =0.04192$

Thus, the molar mass of the gas is 0.04192 M.

Learn more about molar mass

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2 years ago