On the periodic table, all of the elements in Group 1 are ____________
a) considered pure.
b) do not form chemical bonds.
c) have the same number of valence electrons. ​

Answer:

true

Explanation:

the mass of the temperature changes as well so it'll decrease and increase

Answer is C my g. Don't really know how to explain it.

Liters are used to measure water and a liter is about as much as a big pop bottle. Moles measure large quantities of small entities, and grams measure small things like salt.

It’s the liter

Answer:There are total 118 elements in world as about marbale

Explanation:

Answer:

A

Explanation:

Photosynthesis is reverse combustion, thus, water and carbon dioxide should be reactants. Photosynthesis also needs sunlight, so A it is.

Answer:

In a synthesis reaction, two or more chemical species combine to form a more complex product.

Explanation:

Answer:

they are either donated to or taken by another atom to achieve octet arrangement

Explanation:

for example Na+ and Cl- .. they both have one extra and one less electron .

so they donate and receive one electron to/from each other to achieve the octet arrangement ..

Explanation:

tala it is also called myopia lekhnu hai

Äni Arko MA it is also called hypermetropia .

Answer:

Im not 100% sure but i think its option two or 1

Explanation:

Answer:

Human cells are eukaryotic which means they are more complicated, bacteria cells are prokaryotic which means they are simpler and viruses are not even cells at all, they are just genetic material in a protein shell. Not all bacteria make us sick, most actually help us have emunity to the virus. Hope this helps

Explanation:

Answer:

Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. Cells have many parts, each with a different function.

Explanation:

Answer:

They used atomic number instead of atomic mass to organize the elements. From an element's location in the periodic table, you can predict: ... The elements have similar properties.

Answer:

As the temperature of a liquid increases, the kinetic energy of its molecules also increases. As the kinetic energy of the molecules increases, the number of molecules transitioning into a vapor also increases, thereby increasing the vapor pressure.

Answer:

c

Explanation:

it is corundum now please follow me

Answer: corundum

Explanation: Both are made of alumina and oxygen, but they just differ in color. When a corundum is red, it is classified as a ruby, and when it’s blue, it is called a sapphire.

Answer : The molecular formula of benzoyl peroxide is [tex]C_{14}H_{10}O_4[/tex]

Explanation :

Empirical formula : It is the simplest form of the chemical formula which depicts the whole number of atoms of each element present in the compound.  

Molecular formula : it is the chemical formula which depicts the actual number of atoms of each element present in the compound.  

For determining the molecular formula, we need to determine the valency which is multiplied by each element to get the molecular formula.

The equation used to calculate the valency is :

[tex]n=\frac{\text{Molecular mass}}{\text{Empirical mass}}[/tex]

As we are given that the molar mass of compound is, 0.242 kg/mol.

Molecular mass = 0.242 kg/mol = 242 g/mol      (1 kg = 1000 g)

The empirical mass of [tex]C_7H_5O_2[/tex] = 7(12) + 5(1) + 2(16) = 121 g/eq

[tex]n=\frac{\text{Molecular mass}}{\text{Empirical mass}}[/tex]

[tex]n=\frac{242}{121}[/tex]

[tex]n=2[/tex]

Molecular formula = [tex](C_7H_5O_2)_n[/tex] = [tex](C_7H_5O_2)_2[/tex] = [tex]C_{14}H_{10}O_4[/tex]

Thus, the molecular formula of benzoyl peroxide is [tex]C_{14}H_{10}O_4[/tex]

Answer:

Water

Explanation:

When water freezes it forms a crystal lattice shape

Copper chloride would form a crystal lattice. Therefore, option D is correct.

In crystallography, a crystal lattice can be described as a description of the ordered arrangement of atoms, ions, or molecules in a crystalline material. Ordered structures take place from the intrinsic nature of the particles to form symmetric that repeat along the principal directions of 3-D space in matter.

The smallest group of atoms in the material that constitutes this repeating pattern is known as the unit cell. The unit cell fully reflects the symmetry and structure of the crystal, which is built up by the repetition of the unit cell along its principal axes.

The lengths of the principal axes of the unit cell and the angles are the lattice constants called lattice parameters. The symmetry properties of the crystal are based on the concept of space groups.

The crystal structure and symmetry determine many physical properties, such as electronic band structure, cleavage, and optical transparency.

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Answer:

A

Explanation:

Bc ik

The number of atoms in 1 mole of carbon = the number of atoms in 1 mole of boron is not true about one mole.

It is untrue to say that one mole of fluorine gas weighs more than one mole of oxygen gas. Fluorine gas has a molar mass of 38 grams per mole, whereas oxygen gas has a molar mass of 32 grams per mole, based on their relative molar masses.

A mole of a substance is equal to 6.022 × 10²³ of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is referred to as "Avogadro's number" or "Avogadro's constant."

Since boron has a different molar mass than carbon, the statement that there are the same number of atoms in each mole is untrue.

The ratio of the substance's mass to its molar mass is used to express the number of moles of an element.

Moles  = Mass/Molar mass

Given that the molar masses of carbon and boron differ, the statement that the number of atoms in a mole of carbon is equal to the number of atoms in a mole of boron is false.

Therefore, the correct answer is option c) the number of atoms in 1 mole of carbon = the number of atoms in 1 mole of boron.

The complete question is:

Which of the following is not true about one mole?

a) the mass of 1 mole of carbon atoms = the mass of

b) 1 mole of boron atoms

one mole contains 6.02 x 1023 particles

c) the number of atoms in 1 mole of carbon = the number of atoms in 1 mole of boron

d) 12 g of carbon equals one mole of carbon atoms

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Answer:

the answer is A.

i think:/

Explanation:

Moles of Butane combusted : 0.4982

Given

55.8 water vapour at STP

Required

moles of Butane

Solution

Reaction(Combustion of Butane) :

2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O

1 mol at STP = 22.4 L, so mol of H₂O for 55.8 L :

=55.8 : 22.4

=2.491 moles

mol H₂O based on Butane as a limiting reactant(excess  Oxygen)

From the equation, mol ratio Butane-C₄H₁₀ : H₂O = 2 : 10, so mol Butane :

[tex]\tt =\dfrac{2}{10}\times 2.491\\\\=0.4982[/tex]

Answer:

exothermic reaction

Explanation:

your welcome :)

Answer:

Explanation: I can't give you the answer you with the sentence but i will help you the best i can

One qualitative measure of the strength of an acid or a base solution is the pH scale A logarithmic scale that relates the concentration of the hydrogen ion in solution.

CO2 dissolving in bodies of water forms carbonic acid which causes the pH to decrease.

Hope this helps! Please correct me if im wrong! :)

Answer:C. Carbonic Acid; decrease

Explanation:

Carbonic acid is formed and acid decrease pH

Answer:

3) iron (iii) hydroxide

Explanation:

Answer:

a. They are staying at the same speed

Explanation:

IF CORRECT PLSPLSPLS GIVE BRAINLIEST WOULD APPRECIATE :)

Answer:

a. They are staying at the same speed