CHEMISTRY MIDDLE SCHOOL

Name two living resources from the ocean

Answers

Answer 1
Answer: Fish and corrals

ARGHHHHHHHHHHHH


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HIGH SCHOOL

Adam found a block made of lead, the density of lead is 11.36 g/cm 3. The lengths of the blocks sides are 5 cm ,1.5 cm, and 3 cm,respectively.How heavy is adams block

Answers

Answer:

The mass of the block made of lead = 255.6 grams

Explanation:

Step 1: Data given

Density of lead = 11.36 g/cm³

length of the block = 5 cm, 1.5 cm and 3 cm

Step 2: Calculate the volume of the block

Volume = length 1 * length 2 * length 3

Volume = 5cm * 1.5 cm * 3 cm

Volume = 22.5 cm³

Step 3: Calculate mass

Mass of the lead block = density of lead * volume

Mass of the lead block = 11.36 g/cm³ * 22.5cm³

Mass of the lead block = 255.6 grams

The mass of the block made of lead = 255.6 grams

HIGH SCHOOL

Question 14 fill in the left side of this equilibrium constant equation for the reaction of acetic acid hch3co2 with water.

Answers

Explanation:

An equilibrium constant of the reaction is the ratio of the concentrations of the products to the concentration of the reactants raised to their power equal to stoichiometrc coefficients in a balanced chemical equation.

Equilibrium constant equation for the reaction of acetic acid with water.

The equilibrium constant of the above reaction will written as:

HIGH SCHOOL

Use the measurements in the table to determine which unidentified metal has the highest density. Metal Volume Mass
A 10.5 cm3 122 g
B 14.2 cm3 132 g
C 16.1 cm3 115 g
D 12.7 cm3 126 g

Answers

ANSWER: A



EXPLANATION:

THE FORMULA FOR DENSITY IS MASS DIVIDED BY VOLUME.


D= M/V


So divide the mass by the volume.

For A, 122 divided by 10.5 is 11.62

For B, 132 divided by 14.2 is 9.295

For C, 115 divided by 16.1 is 7.143

For D, 126 divided by 12.7 is 9.921


A IS THE ANSWER BECAUSE ITS THE LARGEST AMOUNG THE OTHERS.

Answer:

Metal A has the highest density.

Explanation:

Density is defined as mass present in unit volume of the substance.

Density of metal A

Mass of metal = 122 g

Volume of metal =

Density of metal B

Mass of metal = 132 g

Volume of metal =

Density of metal C

Mass of metal = 115 g

Volume of metal =

Density of metal D

Mass of metal = 126 g

Volume of metal =

Metal A has the highest density.

COLLEGE

Which of these is the correct word equation for the reaction, 4 Fe (s) + 3O2 (g) → 2FeO3 (s)? Solid iron reacts with Iron (II) oxide to form oxygen gas.


Solid iron (II) oxide decomposes to form solid iron and oxygen gas.


Solid iron reacts with oxygen gas to form solid iron (II) oxide.


Oxygen gas reacts with iron (II) oxide to form solid iron.

Answers

The correct answer is 
solid iron reacts with oxygen gas to form solid iron (III) oxide.
The state symbol (s) indicates that iron and iron oxide are in the solid state while the state symbol (g) indicates that oxygen gas is present in the gaseous state.
Moreover, the compound formed has iron (III) as the cation because two moles of iron (III) atoms bind with three moles of oxygen atoms.
COLLEGE

A potassium iodide compound is represented by which formula? A) K2I

B) K2I2

C) KI

D) KI2

Thanks <3

Answers

Potassium iodide is represented by the chemical formula KI as it has one potassium and iodine atom with +1 and -1 charge respectively.

What is chemical formula?

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

There are four types of chemical formula:

1)empirical formula

2) structural formula

3)condensed formula

4)molecular formula

Learn more about chemical formula,here:

brainly.com/question/11995171

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It is represented by C) KI

K+
I-

So it's KI
COLLEGE

Calculate the heat of reaction, ΔH°rxn, for overall reaction for the production of methane, CH4.

Answers

The heat of reaction , for the overall production of methane, CH₄ is -74.7 kJ

The heat of reaction for the formation of methane cannot be determined directly.

From Hess's law, which states that the change of enthalpy in a chemical reaction is the same regardless of whether the reaction takes place in one step or several steps.

Then, we will consider the heat of reaction values for the following reactions

(1) C + O₂(g) → CO₂(g)                                    

(2) 2H₂(g) + O₂(g) → 2H₂O(l)                          

(3) CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l)          

Now, since we are interested in the production of methane, CH₄, we will reverse (3) to get  

(4)  CO₂(g) + 2H₂O(l) → CH₄(g) + 2O₂(g)      

Now, add equations (1), (2), and (4), to get equation (5)

(1)   C + O₂(g) → CO₂(g)                                  

(2)  2H₂(g) + O₂(g) → 2H₂O(l)                        

(4)  CO₂(g) + 2H₂O(l) → CH₄(g) + 2O₂(g)        

-----------------------------------------------------------------------------------------

(5) C + 2H₂(g) → CH₄(g)                                  

Hence, the heat of reaction , for the overall production of methane, CH₄ is -74.7 kJ

Learn more here: brainly.com/question/14291475

Answer: The enthalpy of the reaction for the production of is coming out to be -74.9 kJ

Explanation:

Enthalpy change is defined as the difference in enthalpies of all the product and the reactants each multiplied with their respective number of moles. It is represented as

The equation used to calculate enthalpy change is of a reaction is:  

For the given chemical reaction:

The equation for the enthalpy change of the above reaction is:

We are given:

Putting values in above equation, we get:

Hence, the enthalpy of the reaction for the production of is coming out to be -74.9 kJ

MIDDLE SCHOOL

What is the volume of 3.2 moles of chlorine gas (Cl2) at 295 K and 1.1 atm?​

Answers

Answer:

Explanation:

We can use the Ideal Gas Law to solve this problem

pV = nRT

Data:

p = 1.1 atm

n = 3.2 mol

R = 0.082 16 L·atm·K⁻¹mol⁻¹

T = 295 K

Calculation:

HIGH SCHOOL

A piece of aluminum weighing 10.0 grams is placed into a graduated cylinder that has an initial volume (before immersion) of 35.0 mL. After immersion, the volume on the cylinder reads 38.7 mL. What is the density of the metal sample?

Answers

Answer:

The density of the metal sample is 2.70

Explanation:

Density is a magnitude that allows you to measure the amount of mass in a given volume of a substance. Then, the expression for the calculation of density is the ratio between the mass of a body and the volume it occupies:

Density, according to the International System of Units, is usually expressed in kilograms per cubic meter (kg / m3) or gram per cubic centimeter (g / cm3). Although it can also be expressed in any other unit of mass by volume.

So, for the calculation of density you know that:

  • mass of the sample= 10 grams
  • volume of the sample = volume on the cylinder after immersion - volume on the cylinder before immersion= 38.7 mL - 35.0 ml = 3.7 mL

Then:

d=2.70

The density of the metal sample is 2.70

COLLEGE

Which of the following statements is TRUE? A. Endothermic processes decrease the entropy of the surroundings, at constant T and P.
B. Endothermic processes are never spontaneous.
C. Entropy is not a state function.
D. Exothermic processes are always spontaneous.
E. None of the above are true.

Answers

Answer: Option (A) is the correct answer.

Explanation:

Entropy means the degree of randomness present within the molecules of a substance.

And, in an endothermic process heat is absorbed by the reactant molecules. So, when heat is absorbed from the surroundings then there occurs a decrease in heat energy of the surrounding.

As a result, kinetic energy of surrounding elements decreases due to which there is also decrease in the entropy of surroundings.

As spontaneous process is a process that occurs on its own. So, it can be endothermic or exothermic in nature.

A state function is defined as a function that depends on the initial and final states.

Thus, we can conclude that the statement endothermic processes decrease the entropy of the surroundings, at constant T and P, is true.

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