What forces hold molecular solids together?
A. Intermolecular forces
B. Forces from ionic bonds
C. Forces from covalent bonds
D. Forces from metallic bonds

Answer:

a

Explanation:

Answer:

4.457 × 10²⁴ molecules H₂S

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

252.3 g H₂S

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of H - 1.01 g/mol

Molar Mass of S - 32.07 g/mol

Molar Mass of H₂S - 2(1.01) + 32.07 = 34.09 g/mol

Step 3: Convert

[tex]252.3 \ g \ H_2S(\frac{1 \ mol \ H_2S}{34.09 \ g \ H_2S} )(\frac{6.022 \cdot 10^{23} \ molecules \ H_2S}{1 \ mol \ H_2S} )[/tex] = 4.45688 × 10²⁴ molecules H₂S

Step 4: Check

We are given 4 sig figs. Follow sig fig rules and round.

4.45688 × 10²⁴ molecules H₂S ≈ 4.457 × 10²⁴ molecules H₂S

Answer:

[tex]\boxed {\boxed {\sf 4.457*10^{24} \ molecules \ H_2S}}[/tex]

Explanation:

First, find the molar mass of H₂S

Use the Periodic Table to find the mass of hydrogen and sulfur.

To find the molar mass of H₂S, multiply the molar mass of the elements by the number of atoms of the element.

Add.

Next, find the number of moles in the sample (252.3 g)  Use the ratio of grams to moles.

[tex]252.3 / g * \frac{1 \ mol \ H_2S}{34.086 \ g }[/tex]

Multiply. The grams will cancel each other out.

[tex]\frac{252.3 / mol }{34.086 \ }=7.40186587 \ mol[/tex]

Finally, found the number of molecules using Avogadro's number (There are 6.022*10²³ molecules in 1 mole).

[tex]7.40186587 \ mol \ H_2S*\frac{6.022*10^{23} molecules \ H_2S}{1 \ mol \ H_2S}[/tex]

Multiply. The mole (mol) will cancel each other out.

[tex]7.40186587*{6.022*10^{23}\ molecules \ H_2S} = 4.45740363 *10^{24} \ molecules \ H_2S[/tex]

Round to the correct number of significant figures. The sample had 4 sig figs (2, 5, 2, 3), so round to 4 sig figs.

[tex]4.457*10^{24} \ molecules \ H_2S[/tex]

There are about 4.457 * 10²⁴ molecules of H₂S

Answer:

B

Explanation:

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Answer:

Identify the limiting reactant (limiting reagent) in a given chemical reaction.

Calculate how much product will be produced from the limiting reactant.

Calculate how much reactant(s) remains when the reaction is complete.

Answer:

Calculate the number of moles of oxygen required to react exactly with 4.30 ... How many moles of NH3 can be made from 2.00 moles of Nz if you have excess Hz? ... 10. How many grams of water are made when 3.00 moles of butanol is combusted? ... If 50.0 g of calcium oxide were produced, how many grams of calcium ...

Answer:

41.44 g

Explanation:

First of all, we must put down the equation of the reaction;

[tex]CaO + H2O ----->Ca(OH)2[/tex]

Number of moles of CaO = 33g/56 g/mol = 0.59 moles

Number of moles of H20 = 10g/18 g/mol = 0.56 moles

Since the reaction is in 1:1 mole ration, H2O is the limiting reactant

Hence;

mass of Ca(OH)2 produced = 0.56 moles * 74 g/mol = 41.44 g

Answer:

E--> mc2

E--> 0.007 x (3x108)2

E--> 6.3 x 1014J

Explanation:

Answer:

glucose and galactose

concentration of the enzyme

temperature and pH

glucose and galactose

Explanation:

Enzymes are biological catalysts. They catalyze various biochemical reactions in the  body. Enzymes are proteins.

The enzyme responsible for the breakdown of lactose is lactase. This enzyme catalyzes the breakdown of lactose to glucose and galactose. Galactose is about 65% as sweet as sucrose.

The rate of enzyme reaction is influenced by the concentration of the enzyme.  As the concentration of the enzyme is increased, the velocity of the reaction proportionately increases.

Temperature and pH are important environmental factors that affect the rate of enzyme catalyzed reaction because they influence the activity of the enzyme and may even denature the enzyme.

Answer:

An anion has more electrons than protons, consequently giving it a net negative charge .

hope it helps!

Explanation:

In CO₂ there's 2 double bonds.

Structure:

O=C=O (linear) (180°)

Therefore,

Option C is correct✔

Answer:

there are elemental molecules, made from one type of atom (pure), example: oxygen and there are compound molecules, made from more then one type of atom, for example carbon dioxide

Answer:

The reactants of photosynthesis are Carbon Dioxide and water. The products are Glucose (or starch/sugar) and Oxygen. The autotroph uses light energy from the sun in order to complete this process. In the formula, the arrow is the light energy.

Explanation:

Answer:

I've inserted an image.

Explanation:

Hope this helps!

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Answer:

Rows and columns.

Explanation:

Each atom gives up some of its electrons to create a kind of sea of these randomly moving charged particles. It's these free-flowing electrons that make metals conductive.

Explanation:

Crystals often form in nature when liquids cool and start to harden. Certain molecules in the liquid gather together as they attempt to become stable. They do this in a uniform and repeating pattern that forms the crystal. In nature, crystals can form when liquid rock, called magma, cools.

Answer: Crystals often form in nature when liquids cool and start to harden. Certain molecules in the liquid gather together as they attempt to become stable. They do this in a uniform and repeating pattern that forms the crystal. In nature, crystals can form when liquid rock, called magma, cools.

Explanation: Can i have BrainLiest

Answer:

16.49g

Explanation:

Given parameters:

Mass of Chlorine gas = 7.82g

Unknown:

Mass of NaI  = ?

Solution:

The reaction equation is given as:

            2NaI  + Cl₂  →  2NaCl + I₂  

To solve this problem, find the number of moles of the known specie first;

 Number of moles of Cl₂  = [tex]\frac{mass}{molar mass}[/tex]  

   Molar mass of Cl₂   = 2(35.5)  = 71g/mol

  Number of moles = [tex]\frac{7.82}{71}[/tex]   = 0.11mole

From the balanced reaction equation;

            2 mole of Cl₂ will react with 2 mole of NaI

          0.11 mole of Cl₂ will also react with 0.11mole of NaI

Mass of NaI  = number of moles x molar mass

  Molar mass of NaI  = 23 + 126.9  = 149.9g/mol

Mass of NaI  = 0.11 x 149.9 = 16.49g

Answer: 12 moles of tin is 1,400 or D

It might also be C

Explanation:one mole of tin is 118.71 so that times 12 is equal 1,424 . Round 1,424 and it is 1,400

Answer:

It must be a part of a eukaryote

Explanation:

Eukaryotic cells are larger than prokaryotic cells and have a “true” nucleus, membrane-bound organelles, and rod-shaped chromosomes. The nucleus houses the cell's DNA and directs the synthesis of proteins and ribosomes.

Answer:

I think its digestive

Explanation:

............

Answer:

fitness. the ability of an organism to survive and reproduce in its environment. adaptation. the inherited characteristic that increases an organism's chance of survival.

An inherited characteristic of an organism is called a heredity.

The term heredity refers to the genetic heritage passed down by our biological parents. It is the transmission of traits from one generation to another generation. These traits can be physical, such as eye colour, blood type or a disease, or behavioral.

Heredity is also called biological inheritance, is the exiting of of traits from parents to their offspring either through asexual reproduction or sexual reproduction.

Heredity is a process in which organisms develop characteristics from their parents. These characteristics are called traits. Inheritance is the transmission of information from one generation of individuals to the next.

Thus, An inherited characteristic of an organism is called a heredity.

To learn more about the heredity, follow the link;

https://brainly.com/question/869836

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Answer:

(a) An experiment was conducted, response variable is the concentrations of the chemical

Explanation:

According to Oxford dictionary; an experiment is; "a scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact."

The aim of the entire study is to discover the concentration of a certain chemical at various depths of the river. This means that the entire procedure was undertaken for the purpose of discovery. Hence it is an experiment.

The independent variable here is the depth of the river while the response variable is the concentration of the chemical of interest at each depth.

A responding variable changes as changes are made in the independent variable. The variable that is manipulated in an experiment is the independent variable.

Answer:

compounds , because they're combined

Answer:

The answer is A.) Compounds

Explanation:

Compounds are when the atoms of elements combine. When combined it creates a compound.

Answer:

the students are pushing with equal force

Explanation:

Answer:

Protium

Explanation:

The hydrogen atom is the simplest of all atoms: it consists of a single proton and a single electron. In addition to the most common form of the hydrogen atom that is called protium, two other isotopes of hydrogen exist deuterium and tritium.

Answer: Hydrogen is a atom of the chemical element hydrogen.

Explanation:

The molarity of the diluted solution : 1.1 M

Dilution is the process of adding solvent to get a more dilute solution.

The moles(n) before and after dilution are the same.

Can be formulated :

[tex]\tt n_1=n_2\\\\M_1.V_1=M_2.V_2[/tex]

M₁ = Molarity of the solution before dilution  

V₁ = volume of the solution before dilution  

M₂ = Molarity of the solution after dilution  

V₂ = Molarity volume of the solution after dilution

M₁=5

V₁=0.75

V₂=3.5

[tex]\tt M_2=\dfrac{M_1.V_1}{V_2}\\\\M_2=\dfrac{5\times 0.75}{3.5}\\\\M_2=1.07\approx 1.1[/tex]

Answer:

46.839728  grams of water

Explanation:

1 mole is equal to 1 moles H2O, or 18.01528 grams

18.01528 times 2.6 = 46.839728

There are 46.839728  grams h20 in 2.60 mol of the compound

Answer:

Explanation

hope this helps!

Answer:

Ca-197

Ga-135

Cu-128

Fe-126

Br-114