Name two elements that have properties similar to those of beryllium and have average atomic masses higher than 130

Answer:

CH2

Explanation:

Divide by 2 and you get the answer

atoms are always in motion. i took the test and got it correct

Answer:

The correct answer is (D) Atoms are always in motion is not a part of Dalton's atomic theory because Dalton never sated about atomic motion in his atomic theory. Other options are the part of Dalton's atomic theory.

Explanation:

According to Dalton's atomic theory:

1. Every element is made up of tiny atoms.

2. The atom of the same element shares the same property.

3. The atoms of different elements differ in properties.

4. Atoms cannot be seen and are indestructible.

Dalton never describe the motion of atoms in his theory

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The Celsius temperature required to change the volume of the gas sample to a specific volume at constant pressure can be found using Charles's Law. In this case, the temperature, volume, and initial conditions are given, allowing us to solve for the unknown temperature. By substituting the values into the formula, we find that the required temperature is 316 K.

A volume change caused by a temperature change at constant pressure means we should use Charles's law. Taking V₁ and T₁ as the initial values, T2 as the temperature at which the volume is unknown and V₂ as the unknown volume, and converting °C into K we have:

T₂ = (T₁ * V₂) / V₁

Substituting the given values:

T₂ = (43 + 273) * (2.26 × 10³) / (1.13 × 10³)

T₂ = 316 K

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To change the gas volume from 1.13×10³ L at 43°C to 2.26×10³ L, the required temperature is 359°C. This is calculated using Charles's Law and converting temperatures between Celsius and Kelvin.

Calculating the Required Temperature Using Charles's Law

To solve this, we will use Charles's Law, which states that the volume of a gas is directly proportional to its temperature (in Kelvin) when pressure and the amount of gas are constant. The formula for Charles's Law is:

V₁ / T₁ = V₂ / T₂

First, we convert the temperatures from Celsius to Kelvin:

T₁ = 43°C + 273 = 316 K

Next, we rearrange Charles's Law to solve for T₂:

T₂ = (V₂ × T₁) / V₁

Substitute the known values into the equation:

T₂ = (2.26×10³ L × 316 K) / 1.13×10³ L

T₂ = 632 K

Finally, convert the temperature from Kelvin back to Celsius:

T₂ = 632 K - 273 = 359°C

Thus, the required temperature t₂ is 359°C.

The answer is transition from Y to Z, has a greater energy difference because the red light means higher energy and the blue light means lower energy.

You would be able to find this on the diagram of electromagnetic spectrum.

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The relationship between an element's atomic mass and an element's isotopes is that they have the same number of protons in their respective nuclei.

So, from this, we can conclude that the relationship between an element's atomic mass and an element's isotopes is that they have the same number of protons in their respective nuclei.

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In water Sodium carbonate dissociates to form Sodium hydroxide and carbon dioxide.

The dissociation reaction for Sodium carbonate is

[tex]\rm \bold{ Na_2CO3 \rightarrow 2 Na^(^+^) + CO_3^(^2^-^)}[/tex]

In water the sodium ion will react with [tex]\rm \bold {OH^-}[/tex] ion of water to form Sodium Hydroxide.

[tex]\rm \bold{ Na_2CO3_(_a_q_)+H_2O \rightarrow 2 NaOH + CO_2}[/tex]

Hence we can conclude that in water, Sodium carbonate dissociates to form Sodium hydroxide and carbon dioxide.

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Answer:

Answer:

(an open) (30) (greater than 30) ( 40

Explanation:

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Helium and Sodium are elements, Water and Salt are compounds, while Sedimentary Rock and Air are mixtures.

To correctly classify each substance, we need to understand what elements, compounds, and mixtures are. An element is a pure substance consisting of only one type of atom. A compound is a substance made up of two or more different elements that are chemically bonded. A mixture is composed of two or more different substances that retain their own properties and can be separated physically.

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Answer:

Aluminium reacts with dilute sulfuric acid based on the following reaction:

2Al + 3H2SO4 ..............> Al2 (SO4)3 + 3H2

From the periodic table:

mass of aluminium = 27 grams

mass of hydrogen = 1 gram

mass of oxygen = 16 grams

mass of sulfur = 32 grams

Therefore:

molar mass of aluminium = 27 grams

molar mass of sulfuric acid = 2(1) + 32 + 4(16) = 98 grams

From the balanced chemical equation:

2 moles of aluminium react with 3 moles of dilute sulfuric acid.

This means that 34 grams of Al react with 294 grams of the acid

To get the amount  of aluminium that reacts with 5.890 g of sulfuric acid, we will do cross multiplication as follows:

amount of Al = (5.890 x 34) / 294 = 0.6811 grams

Explanation:

One mole of any substance is equal to Avogadro’s number, 6.023 x 10²³  

A mole of magnesium = a mole of iron = Avogadro’s number, 6.023 x 10 ²³

One mole of any element contains 6.023 x 10²³ number of atoms.  

One mole of any substance contains 6.023 x 10²³ number of atoms, molecules, ions, or formula units.

Explanation:

When zinc chemically reacts with hydrochloric acid in chemical reaction then it leads to the formation of zinc chloride along with evolution of hydrogen gas.

Chemical equation which represents this chemical reaction is as follows.

        [tex]Zn + HCl \rightarrow ZnCl_{2} + H_{2}[/tex]

Number of atoms on reactant side are as follows.

Zn = 1

H = 1

Cl = 1

Number of atoms on product side are as follows.

Zn = 1

H = 2

Cl = 2

Hence, to balance this equation we will multiply HCl by 2 on reactant side. Therefore, the balanced chemical equation is as follows.

              [tex]Zn + 2HCl \rightarrow ZnCl_{2} + H_{2}[/tex]

In a neutral atom, the number of protons equals the atomic number, which also indicates the same number of electrons.

For a neutral atom, the number of protons is also equal to the atomic number. Atoms are neutral in electrical charge because they have the same number of negative electrons as positive protons. Therefore, the atomic number of an atom also tells you how many electrons the atom has. For instance, hydrogen has an atomic number of 1, which means it has 1 proton and 1 electron. Manganese, with an atomic number of 25, has 25 protons and also 25 electrons when neutral. The atomic number not only signifies the number of protons in an atom but also, by default, the number of electrons in a neutral atom.

Your answer would be A. Hope this helps!

The speciality of carbon arises from its ability to form multiple covalent bonds and create complex structures, which are fundamental to organic compounds and therefore, to life. It's the base for a range of compounds due to its bonding capacity with varying elements.

Carbon is special compared to other elements mainly because of its ability to form various structures through covalent bonds, thanks to its four valence electrons. This characteristic enables carbon atoms to bond together forming long chains, or other complex structures, known as carbon skeleton, which is the fundamental feature of organic compounds. However, carbon atoms do not form quadruple bonds and can bond not just with hydrogen and oxygen, but with other elements as well.

Carbon in Organic Compounds:

Organic compounds, which are the basis of life, contain carbon skeletons and hydrogen. Carbon's ability to form covalent bonds with hydrogen, oxygen, and other elements is essential to the diverse structures and functions of these compounds. Also, while carbon can indeed be dissolved in water solutions, so can many other elements.

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Answer: Helium

Explanation:

Answer:

There are two P (phosphorous) atoms and five O (oxygen) atoms.

Explanation:

The subscripts of each element represent the number of atoms of  that element in the molecule.

Atom is the smallest unit of matter. An element is made of identical atoms.

A molecule is made up of more than one different element. And there are more than one atoms of each element in the molecule.

The ability to react with acid is a type of chemical property, therefore the correct answer is option C.

A chemical reaction is a process in which one or more substances, also known as reactants are converted to one or more different substances, known as products.

There are differences between the chemical and physical properties of any material.

The ability to react with acid is a type of chemical property,

While on the other hand ability to conduct heat, the ability to become magnetic, and the ability to conduct electricity are the physical properties of any material.

Thus, the ability to react with acid is a type of chemical property the correct answer is option C.

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Final answer:

The empirical formula of phosphorus selenide is represented as P₂Sen, where 'n' is the number of selenium atoms bonded to two phosphorus atoms. Specific stoichiometry is needed for an exact formula.

Explanation:

The empirical formula of a compound represents the simplest whole-number ratio of the elements within that compound. For phosphorus selenide, we need to look at the actual stoichiometry of the compound to determine its empirical formula. Without specific information on the stoichiometry, we cannot give an exact empirical formula. However, some known phosphorus selenides include P₂Se₃ and P₂Se. To generalize, an empirical formula for phosphorus selenide could be P₂Sen, where 'n' represents the number of selenium atoms that bond with two phosphorus atoms.

The answer to your question is (B) because it does requires the least amount of force for the bicycle to climb the hill.

About 10% of the energy at one trophic level is transferred to the next, with the rest being used for metabolism or lost as heat, explaining why there are typically no more than four trophic levels in a food chain. Hence option A is correct.

The figure that represents the percent of energy transferred from one trophic level to the next is generally about 10%. Energy is passed up a food chain or web from lower to higher trophic levels, and it is depicted by an energy pyramid. The other 90% of the energy is used for metabolic processes or given off to the environment as heat. This significant loss of energy at each step explains why typically there are no more than four trophic levels in a food chain or web, because there isn't enough energy left to support more levels.Hence option A is correct.