CHEMISTRY HIGH SCHOOL

How do the nuclei of different isotopes of an element vary?Isotopes of an element have nuclei with the same number of protons, but a different number of neutrons.
Isotopes of an element have nuclei with the same number of protons and the same number of neutrons.
Isotopes of an element have nuclei with a different number of protons, but the same number of neutrons.
Isotopes of an element have nuclei with a different number of protons, but the same number of electrons.

Answers

Answer 1
Answer:

Answer:isotopes of an element has same number of proton but different number of neutron.

Explanation:

Isotope: The atoms of element having same atomic number but different mass number are called isotope.

Hydrogen has three isotopes called as

1.protium

2.duetrium

3.tritium

All of the isotopes of hydrogen have same atomic number but different masses 1,2,3 respectively.

Isotopes have same outermost shells there for having same chemical properties.

Isotopes have different nuclie due which they have different physical properties.

Tritium the 3rd isotop having diffrent prton to neutron ration emitts radiation there it in traces.

Answer 2
Answer:

Answer: its neutrons

your welcome

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Why for thousand of years people believed that stars moved across earth sky

Answers

Because the earth rotates. and the stars and constellations are in their exact same spots in the universe. its the same as the sun. some people can argue that the sun moves east to west, but in reality, its because the earth is rotating. :) 

btw, this is more like an earth science question, not chemistry.
Because they did not have the proper technology. Hope my answer was useful.

All of the questions

Answers

1. Oxygen
2. CO2 and H2O
3. Oxygen

Blanks...
Oxygen, nasal passage or mouth, nostrils, larnyx, trachea, bronchi, bronchioles, alveoli, chest cavity, diaphragm.

Using ohm's law, explain how voltage changes in relation to current, assuming that resistance remains constant.

Answers

1.) Ohm's law is understood as I = V/R. Given that resistance is constant, then voltage changes directly proportional to current.

In which block of the periodic table is chromium (Cr) found?

Answers

The correct answer for above statement:

chromium is in group 6 d-block

Explanation:

The d-block elements are designated transition metals and have valence electrons in d orbital's. The f-block elements, observed in the two rows at the ground of the periodic table, are called inner transition metals and have valence electrons in the f-orbital's.

Chromium is a synthetic element with symbol Cr and atomic number 24. It is the first component in group 6. It is a steely-gray, glistening, dense and brittle metal which takes a high polish, resists smudging, and has a great melting point.
 chromium is in group 6 d-block

Calculate the decrease in temperarure when 2.00 L at 20.0 degrees celsius is compressed to 1.00 L.

Answers

I suspect that the pressure of this change is constant therefore

The equation is used from the combined gas law. (When pressure is constant both P's will cancel out P/P = 1)
V/T = V/T
Initial   Change

Initially we have 2L at 20 degress what temperature will be at 1L.

2/20 = 1/T
0.1 = 1/T
0.1T = 1
T = 1/0.1
T = 10 degress celsius.

Hope this helps if you won't be able to understand what is the combined gas law just tell me :).

Final answer:

Using Charles's law, the calculation indicates a decrease in temperature by about 146.58 degrees Celsius when a 2.00 L volume of gas at 20.0 degrees celsius is compressed to 1.00 L.

Explanation:

To calculate the decrease in temperature due to compression, we can utilize Charles's Law, provided we are ignoring any changes in pressure. Initially, we have a volume (V₁) of 2.00 L at a temperature (T₁) of 20.0 degrees celsius which is equivalent to 293.15 K (converting to Kelvin). The volume is then compressed to 1.00 L (V₂) and we need to find the new temperature (T₂).

According to Charles' Law (V₁/T₁ = V₂/T₂), after we input the values from the problem, we can isolate T₂, resulting in following equation: T₂ = (V₂* T₁)/ V₁. Substituting the given values, we get T₂ = (1.00L*293.15 K)/2.00 L = 146.57 K.

However, we want to find the decrease in temperature in celsius. Difference in temperature in Celsius and Kelvin scales are the same. So, the decrease in temperature (ΔT) = T₁ - T₂ = 20.0°C - (-126.58°C) = 146.58°C. So, when the volume of the gas is compressed from 2.00 L to 1.00 L, the temperature decreases by about 146.58 degrees Celsius.

Learn more about Charles's Law here:

brainly.com/question/16927784

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What is a chemical bond? A. The attraction of two atoms that holds the atoms together
B. A substance that's composed of atoms
C. A representation of chemical properties
D. The force that holds together the elements in a compound

Answers

A., I believe. It's either an ionic, covalent, or hydrogen bond

Chemical bond is the attraction of two atoms that holds the atoms together.
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