a change of matter is a physical change
True or False​

Answer:

6.054×10²⁵

Explanation:

1)find number of moles of zinc

2)multiply the mole of zinc with 2

3)use the formula mol = number of particle/ avogadro constant

Total, 97.64 moles of hydrochloric acid (HCl) must have reacted.

To determine the number of moles of hydrochloric acid (HCl) that reacted, we first need to find the molar ratio between zinc (Zn) and hydrochloric acid (HCl) from the balanced chemical equation:

Zn(s) + 2 HCl(aq) → ZnCl₂(aq) + H₂(g)

From the equation, we see that 1 mole of Zn will reacts with 2 moles of HCl.

Given that 29.39 × 10²⁴ atoms of zinc reacted, we need to convert this quantity to moles. We can do this by using Avogadro's number:

1 mole of any substance = 6.022 × 10²³ atoms

Number of moles of zinc reacted = (29.39 × 10²⁴ atoms) / (6.022 × 10²³ atoms/mol)

Number of moles of zinc reacted ≈ 48.82 moles (rounded to 3 significant figures)

Now, using the molar ratio from the balanced equation, we can determine the number of moles of hydrochloric acid (HCl) that reacted:

Number of moles of HCl reacted = 2 × Number of moles of zinc reacted

Number of moles of HCl reacted ≈ 2 × 48.82 moles

≈ 97.64 moles

Therefore, approximately 97.64 moles of hydrochloric acid (HCl) must have reacted.

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Answer:

b- 4.4 * 10^-12.

Explanation:

Hello.

In this case, as the reaction:

A + 2B → 3C

Has an equilibrium expression of:

[tex]K_1=\frac{[C]^3}{[A][B]^2}=2.1x10^{-6}[/tex]

If we analyze the reaction:

2A + 4B → 6C

Which is twice the initial one, the equilibrium expression is:

[tex]K_2=\frac{[C]^6}{[A]^2[B]^4}[/tex]

It means that the equilibrium constant of the second reaction is equal to the equilibrium constant of the first reaction powered to second power:

[tex]K_2=K_1^2[/tex]

Thus, the equilibrium constant of the second reaction turns out:

[tex]K_2=(2.1 * 10^{-6})^2\\\\K_2=4.4x10^{-12}[/tex]

Therefore, the answer is b- 4.4 * 10^-12.

Best regards.

Answer:

[tex]Total = 50.6\ moles[/tex]

Explanation:

Given

[tex]Propane = C_3H_8[/tex]

Represent Carbon with C and Hydrogen with H

[tex]C = 13.8[/tex]

Required

Determine the total moles

First, we need to represent propane as a ratio

[tex]C_3H_8[/tex] implies

[tex]C:H = 3:8[/tex]

So, we're to first solve for H when [tex]C = 13.8[/tex]

Substitute 13.8 for C

[tex]13.8 : H = 3 : 8[/tex]

Convert to fraction

[tex]\frac{13.8}{H} = \frac{3}{8}[/tex]

Cross Multiply

[tex]3 * H = 13.8 * 8[/tex]

[tex]3 H = 110.4[/tex]

Solve for H

[tex]H = 110.4/3[/tex]

[tex]H = 36.8[/tex]

So, when

[tex]C = 13.8[/tex]

[tex]H = 36.8[/tex]

[tex]Total = C + H[/tex]

[tex]Total = 13.8 + 36.8[/tex]

[tex]Total = 50.6\ moles[/tex]

Answer:

Electrons

Explanation:

This is because electrons barely contribute to the mass so only protons and neutrons are added.

Answer:

any of the seven chemical elements that make up Group 18 (VIIIa) of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og). :)

Explanation:

Answer:

For edge, the answer is;

D. Xe

(Xenon)

Explanation:

edg- answers ;p

Answer: 1.13 x 10^5

Explanation:

Answer:

A - Atom ---> molecule or compound.

Answer:

true

Explanation:

I'm not sure why cause I dont know how to explain but it's TRUE

Answer:

True  

Explanation:

The particles moving faster in a substance the hotter it gets.

Answer:

We know that there are 6.022 * 10²³ atoms in 1 mole of any element

So, that means that there are 6.022 * 10²³ atoms in 1 mole of Li (Lithium)

Atoms in 3.7 Moles:

atoms in one mole = 6.022 * 10²³

atoms in 3.7 moles = 6.022 * 10²³ * 3.7

atoms in 3.7 moles = 22.28 * 10²³

atoms in 3.7 moles = 2.228 * 10²⁴

Answer:

B. Aluminum is a good conductor of heat

Explanation:

Physical properties are usually those that can be observed using our senses such as color, luster, freezing point, boiling point, melting point, density, hardness and odor. The Physical Properties of Aluminum are as follows: Color : Silvery-white with a bluish tint.

Answer:

I know that it is D for sure

Answer:

25.82°C

Explanation:

Based on the reaction, 1 mole of HCl and 1 mole of NaOH reacts, that means the reaction is 1:1. The moles of each compound are:

Moles HCl:

0.025L * (0.144mol/L) = 0.0036 moles HCl

Moles NaOH:

0.020L * (0.132mol/L) = 0.00264 moles NaOH

Thus, moles of reaction are 0.00264 moles

The heat released in a calorimeter is obtained using the equation:

Q = m*c*ΔT

Where Q is heat released in the reaction:

0.00264 moles * (-57.62kJ/mol) = 0.1521kJ = 152.1J of reaction

m is mass of the solution:

25.0mL + 20.0mL = 45mL * (1.04g/mL) = 46.8g

c is specific heat of the solution:

3.93J/gºC

And ΔT is change in temperature.

Solving for ΔT:

Q /mc = ΔT

151.2J / 46.8g*3.93J°C = 0.82°C = ΔT = Final temperature - Initial temperature.

Final temperature = 0.82°C + 25°C =

Answer:

179.05 g/mol

Explanation:

simple called the percentage of the molecular mass of each isotope and add them together. their sum is the mass of Halfnium.

thus

Hf --- 74/100 × 180 = 133.2

Hf --- 17/100 × 176 = 29.92

Hf --- 9/100 × 177 = 15.93

total mass = 133.2+29.92+15.93

= 179.05 g/mol

Answer:

The equilibrium concentration of NO is 0.02124 M.

Explanation:

Given that,

Initial concentration of NOBr = 0.878 M

[tex]k_{c}=3.07\times10^{-4}[/tex]

Temperature = 24°C

We know that,

The balance equation is

[tex]2NOBr\Rightarrow 2NO+Br_{2}[/tex]

Initial concentration is,

[tex]0.878\Rightarrow 0+0[/tex]

Concentration is,

[tex]-2x\Rightarrow 2x+x[/tex]

Equilibrium concentration

[tex]0.878-2x\Rightarrow 2x+x[/tex]

We need to calculate the value of x

Using formula of concentration

[tex]k_{c}=\dfrac{[NO][Br_{2}]}{[NOBr]^2}[/tex]

Put the value into the formula

[tex]3.07\times10^{-4}=\dfrac{[2x][x]}{[0.878-2x]^2}[/tex]

[tex]2x^2=3.07\times10^{-4}\times(0.878)^2+3.07\times10^{-4}\times4x^2-2\times2x\times0.878\times3\times10^{-4}[/tex]

[tex]2x^2=0.0002367+0.001228x^2-0.0010536x[/tex]

[tex]2x^2-0.001228x^2+0.0010536x-0.0002367=0[/tex]

[tex]1.998772x^2+0.0010536x-0.0002367=0[/tex]

[tex]x=0, 0.01062[/tex]

We need to calculate the equilibrium concentration of NO

Using formula of concentration of NO

[tex]concentration\ of\ NO=2x[/tex]

Put the value of x

[tex]concentration\ of\ NO=2\times0.01062[/tex]

[tex]concentration\ of\ NO=0.02124[/tex]

Hence, The equilibrium concentration of NO is 0.02124 M.

Answer:

1.     CaCO3 + 2HCl → CaCl2 + H2O + CO2

2.    C6H12O2 + 8O2 → 6CO2 + 6H2O

Explanation:

The balanced chemical equation is (i) CaCO3+2HCl⟶CaCl2+CO2+H2O

(ii) C6H12O2+ 8O2⟶CO2+6H2O

An equation with equal amounts of every atom of an element on both endpoints of the arrow was called a balanced equation.

Given chemical equation is:

(i) CaCO3+HCl⟶CaCl2+CO2+H2O

It can be seen that in left side of the chemical equation count of chlorine atom is one while right side of the chemical equation it is two. So, by multiplying 2 as a coefficient in the right side of the equation. Balanced chemical equation will be

CaCO3+2HCl⟶CaCl2+CO2+H2O

(ii) C6H12O2+O2⟶CO2+H2O

It can be seen that, there are 12 hydrogen in the left side of the reaction while it is two hydrogen in the right side of the reaction. By multiplying 6 as a coefficient of hydrogen. Hence, the balanced chemical equation will be

C6H12O2+ 8O2⟶CO2+6H2O

The balanced chemical equation is

(i) CaCO3+2HCl⟶CaCl2+CO2+H2O

(ii) C6H12O2+ 8O2⟶CO2+6H2O

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Answer: 0 I think

Explanation:

pretty sure its zero because  i learned it last year but im in middle school so you might want to look it up.

Answer:

witch one witch species witch bone of 1 and 2

Answer:

Yes, process 1 has an advantage over process 2 for the planarian worm. Process 1 requires only one parent. If the planarian can’t find a mate, the life cycle will continue because it can still reproduce.

Explanation:

i did it

Answer:

Inductive reasoning

Explanation:

Inductive reasoning is based on making broad generalizations from specific observations. We draw conclusions from the data we have. This is the opposite of deductive reasoning, which starts with a general statement and aims to reach a specific conclusion.

Based on this, we can conclude that, if an investigator uses their knowledge, training, experience, and expertise to reach a conclusion, they are using inductive reasoning.

Answer:

Explanation:

Noble gas notation: [Xe] 6s2

Complete Electron Configuration: 1s22s22p63s23p63d104s24p64d105s25p66s2.

(ik kinda hard to understand but i looked it up ant it works)

Answer:

Complete Electronic Configuration:

1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²

Electronic Configuration in Noble Gas Notation:

[Xe] 6s²

Answer:

X indicates proteins Y indicates lipids

Explanation:

X shows membrane bound proteins. Y shows lipids in the plasma membrane.

Answer:

I think that x indicates proteins and y indicates lipids

Explanation:

Proteins often are channels that help things get in and out of the cell, and x looks like one.

Membranes are made of phospholipids, which are types of lipids. Y is a lipid.

Answer:

The cell on the left is animal, The cell on the right is a plant cell.

Explanation:

1: cell membrane

2: chloroplast

3: cell wall

4: vacuole

5: mitochondria

6:nucleus

7: lysosome

8: cytoplasm

Things to remember, only plant cells have cell walls. Plant cells are the only ones that have chloroplast.

Answer:

From fastest to slowest its: (4)A to B, (1)E to F, (3)C to D, (2)D to E

Explanation:

The steeper the line is the faster she went. D to E she didn't make any progress because the line is straight. Sry I'm terrible at explaining things.

Answer:

Radioactive decay

Explanation:

Answer:

D. Radioactive decay

Explanation:

Answer:

1L of hot water just below the Boling point

Explanation:

asking questions is best to learn please ask more questions

Answer:

its 1kg of boiling water

Explanation:

Answer:

Is like for solving for the solution for both equations??