Lithium, the number-three element on the periodic table, has a mass that is twice that of hydrogen. true or false?

Answers

Answer 1

Answer: The correct answer is false. Lithium has a mass that is not twice that of hydrogen or any other element rather it is approximately half the mass of a carbon atom. Lithium has a mass of 6.941 g / mol while carbon has a mass of 12.01 g / mol

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Use the ideal gas law to calculate the pressure in atmospheres of 0.21 mol of helium (He) at 16°C & occupying 2.53 L. You must show all of your work to earn credit. **Don't forget to convert your Celsius temperature to Kelvin***picture attached !!*

Answers

Answer:

The answer to your question is 2.32 atm

Explanation:

Data

P = ?

n = 0.214

V = 2.53 L

T = 61°C

R = 0.082 atm L/mol°K

Formula

PV = nTR

solve for P

P = nRT/V

Process

1.- Calculate the temperature in K

°K = °C + 273

°K = 61 + 273

= 334

2.- Substitution

P = (0.214 x 0.082 x 334) / 2.53

3.- Simplification

P = 5.86/2.53

4.- Result

P = 2.32 atm

The molar mass of I2 is 253.80 g/mol, and the molar mass of NI3 is 394.71 g/mol. How many moles of I2 will form 3.58 g of NI3?

Answers

The balanced chemical reaction is:

N2 +3 I2 = 2NI3

We are given the amount of product formed. This will be the starting point of our calculations.

3.58 g NI3 ( 1 mol NI3 / 394.71 g NI3 ) ( 3 mol I2 / 2 mol NI3 ) = 0.014 mol I2.

Thus, 0.014 mol of I2 is needed to form the given amount of NI3.

Which electrons are removed first when forming cations of Period 4 transition elements?

Answers

Electrons are always removed from the valence electron shells and from the valence orbitals within the shell when forming a cation. For example, Cr has a electronic configuration of 1s2 2s2 2p6 3s2 3p6 3d5 4s1
When forming the ion Cr3+, the new electronic configuration will be 1s2 2s2 2p6 3s2 3p6 3d3. We can see that 3 electrons are removed from the valence shell following the order of the highest energy orbitals to lower energy.

What is the name of cells that have the ability to develop into different
kinds of cells?

Answers

Answer:

stem cells

Explanation:

hope it helps

What allows a gas to fill a container? A. the shape of the particles in a gas
B. the size of the particles in a gas
C. the constant motion of the particles in a gas

Answers

Answer: Option (A) is the correct answer.

Explanation:

It is known that particles of a gas are held by weak Vander waal forces, therefore, there is no force of attraction between gas molecules.

As a result, these particles are in random motion.

Thus, we can conclude that out of the given options, the constant motion of the particles in a gas allows a gas to fill a container.

The elements that do not ordinarily form compounds area. elements in the carbon family.
b. metals.
c. halogens.
d. noble gases.

Answers

The elements that do not ordinarily form compounds are noble gases as they have complete octet.

What are elements?

An element is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.

Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.

The number of protons in the nucleus is the defining property of an element and is related to the atomic number of the element.All atoms with same atomic number are atoms of same element.

Learn more about element,here:

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Noble gases, the have all 8 valence electrons so they do not have a need to bond

Other Questions

Any substance composed of two or more elements that are chemically combined in a fixed proportion is(1) an isomer (3) a solution(2) an isotope (4) a compound

Some substances cannot exist in liquid form at normal atmospheric conditions.True or False ?

Consider the following reversible, exothermic chemical reaction: 2C2H2(g) + 5O2(g) ↔4CO2(g) + 2H2O(g) All BUT one of the conditions will cause equilibrium to shift right and produce more of the products. Which change will cause the reaction to shift to the left? A) adding oxygen B) adding CO2 C) increasing the pressure D) decreasing the temperature

Mintu wants to increase the heat transfer between a metal iron and another piece of metal he wants to shape. He decides to increase the time the two metals are in contact, use a larger metal iron, and use a new metal material with a higher specific heat. Where is Mintu's error?A:Mintu should have decreased the size of the metal ironB:Mintu should have decreased the time he touches the two metalsC:Mintu should have chosen a material with a lower specific heatD:Mintu should have chosen a material the same temperature as the iron.