CHEMISTRY HIGH SCHOOL

Which diatomic molecule is formed when thetwo atoms share six electrons?
(1) H2
(2) N2
(3) O2
(4) F2

Answers

Answer 1

Answer:

Answer: (2) $N_2$

Explanation:

1) $H_2$ is a diatomic molecule which is formed by sharing of two electrons between two hydrogen atoms.

2) $N_2$ is a diatomic molecule which is formed by sharing of six electrons between two nitrogen atoms.

3) $O_2$ is a diatomic molecule which is formed by sharing of four electrons between two oxygen atoms.

4) $F_2$ is a diatomic molecule which is formed by sharing of two electrons between two fluorine atoms.

Answer 2

Answer: I believe the correct answer from the choices listed above is option 2. The diatomic molecule that is formed when the
two atoms share six electrons would be N2. It has five valence electrons, so it needs three more valence electrons to complete its octet.

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Do x-rays travel slower than infrared

Answers

No, x-rays do not travel slower than infrared radiation or even the opposite. Both are travelling in vacuum therefore they travel at same speed. They differ in the frequency of the electromagnetic waves.

What is the energy required to remove an electron from an atom in the gaseous state called

Answers

Answer:

The energy required to remove the the electrons from gaseous atom is called ionization energy.

Explanation:

Ionization energy:

The amount of energy required to remove the electron from gaseous atom is called ionization energy.

Trend of ionization energy in periodic table:

Along period:

The atomic size tend to decrease in same period of periodic table with increase of atomic number because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.

Along group:

Atomic size increases with increase of atomic number from top to bottom. The nuclear attraction on valance shell became weaker and thus it becomes easy to remove an electron from valance shell and this can be done with less amount of energy. That's why ionization energy decreases from top to bottom.

The energy required to remove an electron from an atom in the gaseous state is called the ionization energy.

What is ionization energy.

Ionization energy, also known as ionization potential, refers to the minimum amount of energy required to remove an electron from an atom or ion in its gaseous state, resulting in the formation of a positively charged ion.

The ionization energy can vary depending on the specific electron being removed (valence electron or inner shell electron) and the atom or ion involved. Generally, it requires more energy to remove electrons from atoms with higher nuclear charges or tighter electron configurations.

Read moter on ionization energy. here brainly.com/question/30831422

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The half-life of a radioactive isotope is 20.0 minutes. What is the total amount of a 1.00-gram sample of this sample of this isotope remaining after 1.00 hour?

Answers

The amount remaining is obtained using the half life data. The total amount remaining after one hour is equal to 1/( e^ (ln2/(20/60))*1). The final answer is 0.125 grams.

Answer: 0.125 grams

Explanation:

Radioactive decay follows first order kinetics.

Half-life of give isotope = 20 minutes

$\lambda =\frac{0.693}{t_{(1)/(2)}}=(0.693)/(20)=0.03465min^(-1)$

$N=N_o* e^(-\lambda t)$

N = amount left after time t= ?

$N_0$ = initial amount = 1.0 g

$\lambda$ = rate constant

t= time = 1 hour = 60 min

$N=1.0* e^{- 0.03465mi^(-1)* 60min}$

N=0.125g

Thus amount left after 1 hour is 0.125 grams

The change of state from liquid to gas is called

Answers

When liquid surface particles transition into gas phase, evaporation occurs. The process of change of state from liquid to gas is called as evaporation.

What is evaporation ?

The process of evaporation turns liquid water into gaseous water (water vapor). Evaporation is how water gets from the surface of the Earth to the atmosphere. Heat energy causes the bonds holding the water molecules together to fall apart, which causes evaporation.

When liquid surface particles transition into gas phase, evaporation occurs. Only the liquid particles near the surface have enough energy to separate from the remainder of the liquid and exit into a gaseous phase, making it a surface phenomenon.

The water cycle includes evaporation, which is a crucial step. The evaporation process is driven by solar energy, or heat from the sun. It absorbs moisture from both the largest oceans and lakes as well as garden soil.

Thus, The change of state from liquid to gas is called as evaporation.

To learn more about evaporation, follow the link;

brainly.com/question/5019199

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The change of state from liquid to gas is called evaporation because solid to liquid is called melting and liquid to solid is called freezing and solid to gas is called sublimation and gas to solid is called deposition. So liquid to gas is called evaporation......hope it helped :)

In the same science fair,Tina ask the question "does caffeine increase the heart rate of an earthworm?" In test 1,she measures the heart rate by looking at the earthworm under a microscopes, the heart rate if 50 beats per minute. In test 2,she places a few drops of caffeine on the earthworms skin and measures the rate again.in this test the heart rate is 68beats per minuteWhat is the independent variable in this experiment
What is the dependent variable in this experiment
Tina's experiment should have included a hypothisis .in a complete sentence,suggest a hypothesis for Tina's experiment

Answers

The independent variable is the one that does not change depending on other variables - so here it would be the presence or the absence of caffeine - this is dependent on Tina's actions, but not on other variables in the experiment. The dependent variable is the heart rate - it is assumed to depend on the presence or absence of caffeine. A hypothesis could be that "Caffeine causes an increase of heart rate in earthworms" - and this hypothesis is what the experiment is testing.

The recommended daily requirement of calcium is1,000 mg. Tap water in a Midwestern city contains approximately 150 mgCa/L. A person living in the city who drinks two liters of water in oneday would receive ________ percent of his/her RDA of calcium. A. 3
B. 7.5
C. 15
D. 30