Helpppppp ASAP I will give correct answer brainliest 

P1: 741 mmHg

V1: 3.49 L P1 x V1 / P2= (741 mmHg) (3.49 L) / 760 mmHg = 3.40 L

P2: 760 mmHg

V2: ? L

Answer: b

Explanation: alpha decay or particle consist of two protons and two neutrons hence it is a helium nucleus.

An alpha particle [tex]\binom {4} {2}[/tex]He is produced in alpha decay reactions, while the parent nucleus' atomic number and mass number drop by 2 and 4 correspondingly.

Therefore, the final answer is "Option B".

Find out more about the alpha decay here:

brainly.com/question/14081292

Answer:

Gas – In a gas, particles are in continual straight-line motion. The kinetic energy of the molecule is greater than the attractive force between them, thus they are much farther apart and move freely of each other. In most cases, there are essentially no attractive forces between particles.

Explanation:hopes this helps:)

Answer: 0.11 g H2

Explanation: just took test and got it right

Answer: There are 576.46 number of grams present in 16.95 mol hydrogen peroxide [tex](H_{2}O_{2})[/tex].

Explanation:

Number of moles is defined as the mass of substance divided by its molar mass.

The molar mass of [tex]H_{2}O_{2}[/tex] is 34.01 g/mol. Hence, mass of hydrogen peroxide present in 16.95 moles is calculated as follows.

[tex]Moles = \frac{mass}{molarmass}\\16.95 mol = \frac{mass}{34.01 g/mol}\\mass = 576.46 g[/tex]

Thus, we can conclude that there are 576.46 number of grams present in 16.95 mol hydrogen peroxide [tex](H_{2}O_{2})[/tex].

Answer:

2.20*4.5=?? you have to solve the multiplication ok, or its not learning

Explanation:

Answer:

259.6kPa

Explanation:

because it is big

Answer:

A solution with a pH of 2

Explanation:

The lower a pH is in a liquid, the more acidic it is. 7 is the neutral pH for a liquid. We usually drink around that pH for water. A pH higher than 7 expresses that the liquid is a base.

Answer:

A solution with a pH of 2 is more acidic.

Explanation:

The solution with a pH of 2 is more acidic because on the pH scale as you get closer to zero, the more acidic the solution becomes.

Answer:

When one reactant is in excess, there will always be some left over. The other reactant becomes a limiting factor and controls how much of each product is produced. While using excess reactants can help to increase percentage yields, this is at the expense of atom economy.

Explanation:

Any molecule can be represented by a formula that lists all the atoms in that molecule. Each element is represented by its atomic symbol in the Periodic Table – e.g. H for hydrogen, Ca for calcium. If more than one atom of a particular element is present, then it’s indicated by a number in subscript after the atomic symbol — for example, H2O means there are 2 atoms of hydrogen and one of oxygen.

If there is more than one of whole groups of atoms, then that’s shown with a bracket around them. For example, calcium hydroxide has one calcium (Ca) for every two hydroxides (OH), so is written as Ca(OH)2.

If a charge is present, it’s indicated in superscript, with a sign (+/-) and a number if more than one charge is present. For example, calcium ions have two positive charges so are written Ca2+.

Sometimes a formula can be written in a way that gives an indication of the structure. A chemical equation shows a reaction taking place. On the left-hand side are the reactants, the molecules that take part in the reaction. On the right-hand side are the products, the molecules that are created in the reaction. Each side must contain the same number of each kind of atom. An arrow between them indicates the direction the reaction is expected to occur:

Ca + Cl2 → CaCl2

Calcium + chlorine → Calcium chloride

If there are two or more of any molecules, that’s indicated with a number in front of the molecule:

CH4 + 2O2 → CO2 + 2H2O

One methane molecule + two oxygen molecules → one carbon dioxide molecule and two water molecules

An equation may sometimes specify which phase each molecule is in – whether it’s solid, liquid, or gas, or if it’s dissolved. This is written in brackets after the molecule – (s) for solid, (l) for liquid, (g) for gas, and (aq) for ‘aqueous’, meaning dissolved in water. For example, solid calcium carbonate reacts with carbonic acid in water to form calcium bicarbonate, which is much more soluble so becomes dissolved in water:

CaCO3 (s) + H2CO3 (aq) → Ca(HCO3)2 (aq)

Solid calcium carbonate + dissolved carbonic acid → dissolved calcium bicarbonate

All chemical reactions can actually proceed in either direction. Most of the time, one direction is expected to take place more strongly, so the arrow is written in that direction. However, many common reactions happen in both directions simultaneously, creating an equilibrium where the reactions are taking place but there is no net change in concentration from one side to the other. This is indicated with the symbol ⇌.

For example, carbonic acid in water is continually breaking down into bicarbonate and hydrogen ions – but the ions are also continually joining back together.

H2CO3 ⇌ HCO3– + H+

Carbonic acid ⇌ bicarbonate + hydrogen ions

Explanation:

Entropy also increases when solid reactants form liquid products. Entropy increases when a substance is broken up into multiple parts. The process of dissolving increases entropy because the solute particles become separated from one another when a solution is formed. Entropy increases as temperature increases. S = entropy

k_{b} = Boltzmann constant

\ln = natural logarithm

\Omega = number of microscopic configurations

Answer: symbiotic relationship

Explanation:

The new volume of the gas wii be 4.7 liters.

Answer:

1. A

2. C

3. B

4. D

5. D

6. B

Explanation:

I'm not quiet sure on 5 but I'm pretty sure its correct

Answer:

B. Dispose of pH paper in the trash.

C. Dump the cabbage indicator solution down the drain.

D. Ask your teacher to neutralize the acids and bases before disposal.

Explanation:

Safe disposal of waste means disposal of waste in such a way that it does not pose a threat to the environment.

When pH paper is properly disposed in the trash, it does not constitute any risk to the environment.

When a cabbage indicator solution is disposed down the drain it does not contaminate the environment. It moves directly into the sewers and is properly disposed.

When acids and bases are properly neutralized before disposal, they don't lead to acid or base contamination of the environment.

Answer:

i dont know

Explanation:

because i dont know 45

Answer:

4.6 mol Si

General Formulas and Concepts:

Atomic Structure

Stoichiometry

Explanation:

Step 1: Define

[Given] 2.8 × 10²⁴ atoms Si

[Solve] moles Si

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

4.64962 mol Si ≈ 4.6 mol Si

1.What's the first thought that comes to mind when you hear "nuclear"? nuclear, that's the word. well the first thing that comes into everyone's mind in nuclear and they have to think it then think of words that associate with it.

2.the most important point of something.

3.test site

4.

Answer: refraction

Explanation: this is because during refraction light moves from one medium to another.

Answer:

More particles per unit volume

Explanation:

Concentration means the amount of solute in a solution. Now, the amount of solute also means the number of particles of solute present in a solution.

Hence, when we use the term "high concentration", we imply that the amount of solute present or the number of particles present in a solution is high.

Thus, at high concentration, there are more solute particles than solvent particles in a solution.

Answer:

2H2+2O2=2H2O

Explanation:

hope this helps

Answer:

iodine = I

sodium= Na

oxygen= O2

aluminum = AI

nitrogen=N

sulfur= S

bromine =Br

magnesium =Mg

Answer: Approximately [tex]0.48 \times 10^{-2} \ \text{ mole}[/tex]

============================================================

Explanation:

There are roughly 6.02 * 10^23 atoms in one mole of any element. So we have 6.02 * 10^23 atoms in one mole of nitrogen.

We can then do the following conversion:

[tex]\left(2.9 \times 10^{21} \ \text{ atoms of nitrogen} \right)\times \left(\frac{1 \ \text{ mole}}{6.02 \times 10^{23} \ \text{ atoms}}\right)\\\\\frac{2.9 \times 10^{21}}{6.02 \times 10^{23}} \ \text{ mole}\\\\\frac{2.9}{6.02} \times 10^{21-23} \ \text{ mole}\\\\0.48172757 \times 10^{-2} \ \text{ mole}\\\\0.48 \times 10^{-2} \ \text{ mole}\\\\[/tex]

Answer:

the 4th one is the corrent one

Explanation:

C - 6 atoms

H - 12 atoms

O - 6 atoms + 12 atoms

total number of stoms = 6 + 12 + 6 + 12 = 36

Answer:

.52 M

Explanation:

moles ÷ liters = molarity

2.45 ÷ 4.75 = 0.5157894737

rounding it = .52

Answer:

Limiting reactant is FeCl3; 1.7 g of Mg remain.

Explanation:

From the question;

The equation is;

3Mg(s) + 2FeCl₃(s) → 3MgCl₂(s) + 2Fe(s)

Amount of Mg = 41 g/24.31 g/mol = 1.687 moles

The limiting reactant yields the least amount of MgCl2

3 moles of Mg yields 3 moles of MgCl2

Hence 1.687 moles of Mg yields yields 1.687 moles of MgCl2

FeCl₃ = 175 g/162.2 g/mol = 1.0789 moles

2 moles of FeCl3 yields 3 moles of MgCl2

1.0789  moles of FeCl3 yields 1.0789  * 3/2 = 1.61835 moles of MgCl2

Hence FeCl3 is the limiting reactant

3 moles of Mg reacts with 2 moles of FeCl3

x moles of Mg reacts with 1.0789  of FeCl3

x = 3 * 1.0789  /2 = 1.61835 moles of Mg

Mass of Mg reacted = 1.61835 moles * 24.31 = 39.342 g

Mass of excess Mg = 41 g - 39.342 g = 1.7 g

Answer:

Explanation:

b

Answer:

the changes are physical changes