CHEMISTRY MIDDLE SCHOOL

What group of elements are the most reactive group of conductive
solids?

Answers

Answer 1
Answer:

Answer: group 1(alkali metal)

Explanation:
Answer 2
Answer:

Answer:

the answer is the alkali metals

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4. Which of the following is a pseudo-noble-gas electron configuration?O A 1s22s22p3s23p%3d10
OB 1s22s22p63s23p6
OC 1s22s22p63s2305
OD 1s22s²2p63s23d10452

Answers

Answer:

1s2 2s2 2p6 3s2 3d5  is a pseudo-noble-gas electron configuration

Explanation:

It is the technetium with atomic number 43. Being the lightest element having isotopes with all radioactive and no one are more stable as compared to that of technetium which is in fully ionised state i.e. 97 Tc. This element is mostly used for gamma ray emission in medical treatment. Also found to be used as corrosion inhibitor in case of steel, when present in small amount gives better result. This metal is silver grey colour that is found to discoloration when comes in contact with moist air. Its isotopes are radioactive.

Answer:

1s2 2s2 2p6 3s2 3p6 3d10

Explanation:

A pseduo noble gas configuration refers to charged species with electron configurations that are almost identical to that of one of the noble gases.

The noble gas (n-1)d^10 (where n refers to the principal quantum number of the outer s orbital) configuration of ions is commonly known as a pseudo noble gas configuration. The configuration stated in the answer is for Cu^+ ion. n in the case of Cu^+ ion is 4(since copper metal has a 4s1 level).

Note that; 1s2 2s2 2p6 3s2 3p6 is the electron configuration for argon, followed by 3d^10. Hence our definition for a pseudo noble gas.

What kind of mistake has a scientist made if he accidentally spills a chemical that causes invalid conclusions? Is it a honest mistake or a biased mistake

Answers

honest mistake because he accidentally spilled it

1. What is the wave speed of a wave that has a frequency of 100 Hz and a wavelength of 0.30 m?

Answers

The wave speed of a wave consist of  frequency of 100 Hz and a wavelength of 0.30 m is 30 m/s.

What is Wave speed of a wave?

Wave speed is referred to the distance a wave travels in a particular amount of time, such as the number of meters it travels per second.

Speed = wavelength (λ) × frequency (ν).

Given wavelength = 0.30 m and frequency= 100 Hz

Wave speed = 0.30 × 100 = 30 m/s

So, the wave speed of the wave is 30 m/s.

Learn more about wavelength, here:

brainly.com/question/7143261

Answer: The wave speed of the wave is 30 m/s

Explanation:

Wave speed is defined as the product of its wavelength and frequency.

Mathematically,

\text{Wave speed}=\lambda* \nu

where,

\lambda = wavelength of the wave = 0.30 m

\nu = frequency of the wave = 100 Hz = 100s^(-1)

Putting values in above equation, we get:

\text{Wave speed}=0.30m* 100s^(-1)\n\n\text{Wave speed}=30m/s

Hence, the wave speed of the wave is 30 m/s

Why do we ignore noble gases usually when we discuss electronegativity values?

Answers

Because they don’t have charges

the mass of a 125 cm3 piece of material is 82.75 g. determine the density of this material . please explain

Answers

you would do 82.75 divided by 125 cm3 and get 0.6620 g/cm3 because to find density you mist divide mass and volume and grams is always mass and cm3 or mL is always volume. hope i helped!

Why does water with salt in it freeze much more slower than water without it ? Explain

Answers

When you add salt to water, you lower to freezing point of the substance.

So for example, normal water freezes at 0°C. But water with salt in it won't freeze at 0°C, because its freezing point is lowered. 

In answer to the question. It takes longer for water with salt in it to freeze because the substance requires a lower temperature than normal water to freeze.
The more salt in the water, the lower the freezing point will be. When freshwaterfreezes, water molecules of hydrogen and oxygen have bonded together into a crystalline structure of ice. The presence of salt makes it harder for water molecules to bond to the ice structure, because ice naturally repels salt molecules.
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