CHEMISTRY MIDDLE SCHOOL

Please help!!!The reaction of sulfuric acid (H2SO4) with potassium hydroxide (KOH) is described by the equation below. Suppose
0.06 L of KOH with unknown concentration is placed in a flask with bromthymol blue indicator. A solution of 0.20 M
H2504 is dripped into the KOH solution. After exactly 0.017 L of H2SO4 is added, the Indicator changes from blue to
yellow. What is the concentration of the KOH? You must show all of your work to earn credit. (4 points)
H2SO4 + 2KOH → K2SO4 + 2H20

Answers

Answer 1

Answer:

Answer:

$\large\boxed{\large\boxed{1M}}$

Explanation:

1. Reaction

$H_2SO_4+2KOH\rightarrow K_2SO_4+2H_2O$

2. Mole ratio

$(2molKOH)/(1molH_2SO_4)$

3. Sulfuric acid

$Molarity=(moles)/(volume(liters))$

$Moles=Molarity* Volume(liters)$

$Moles=0.20M* 0.017liter=0.034molH_2SO_4$

4. Potassium hydroxide

$(2molKOH)/(1molH_2SO_4)* 0.034molH_2SO_4=0.068molKOH$

$Molarity=(0.068mol)/(0.06liter)=1.13M\approx 1M$

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Which of these processes take place at the same temperature?freezing and condensation
melting and sublimation
condensation and vaporization
sublimation and boiling

Answers

Answer:

Condensation and vaporization

Explanation:

At a given temperature, molecules of a liquid move into the gas phase (vaporization) and the molecules of the vapour can move back into the liquid phase (condensation).

Answer:

condensation and vaporization

Calculate the number of molecules in a sample of carbon dioxide with a mass of 168.2 grams

Answers

Answer: 2.30x10²⁴ molecules CO2

Explanation: Solution:

Convert mass of CO2 to moles

Convert moles of CO2 to molecules using Avogadro's number.

168.2 g CO2 x 1 mole CO2 / 44 g CO2 x 6.022 x10²³ molecules CO2 / 1 mole CO2

= 2.30 x10²⁴ molecules CO2

Final answer:

The sample of carbon dioxide weighing 168.2 grams contains approximately 2.30 x 10^24 molecules. This is calculated by first converting the sample mass to moles, and then multiplying by Avogadro's Number.

Explanation:

To calculate the number of molecules in a sample, you need to know the formula for the substance and the molar mass of the substance. For carbon dioxide (CO2), the molar mass is 44.01 grams/mole.

The sample mass is 168.2 grams, so to calculate the number of moles, we divide the mass of the sample by the molar mass:

Number of moles = Sample Mass / Molar Mass =168.2 grams / 44.01 grams/mole = 3.82 moles (rounded to two decimal places).

The number of molecules is then calculated by multiplying the number of moles by Avogadro's Number (6.022 x 10^23 molecules/mole):

Number of molecules = Number of Moles x Avogadro's Number = 3.82 moles x 6.022 x 10^23 molecules/mole = 2.30 x 10^24 molecules (rounded to two decimal places).

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Write a balanced equation for double replacement of KOH+ZnCl2

Answers

Answer :

Double replacement reaction : It is a type of reaction in which a positive cation and a negative anion of the reactants react to give a new compound as a product.

$AB+CD\rightarrow AD+CB$

In this, A and C are the cations and B and D are the anions.

When one mole of potassium hydroxide react with the one mole of zinc chloride to give one mole of zinc hydroxide and 2 moles of potassium chloride.

The balanced chemical reaction is,

$KOH+ZnCl_2\rightarrow Zn(OH)_2+2KCl$

Scientists classify rocks into three different types. What is the main basis for the classification system they chose?

Answers

Answer:

The main basis for the classification system is the way rocks were formed. With these criteria there are three different types of rocks:

Igneous rocks : formed through the cooling and solidification of magma or lava

Sedimentary rocks : formed by the accumulation or deposition of small particles

Metamorphic rocks: formed by the transformation of existing rock types by heating and pressure

1. color of the rock
2. shape of the rock
3. how the rock is formed
4. who discovered the rock
that is it

How are chemical changes of matter related to the organization of the periodic table

Answers

Chemical changes of matter are related to electronic configuration which is same along a group in case of valence shell in the periodic table.

What is periodic table?

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.

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The elements are organized in groups, and the groups have the same chemical properties, therefore having similar chemical changes.

An object was measured by a worker as 17.4cm long, however, the manufacturer specifications list the length of the object at 17.9cm. What is the percent error in the workers measurements? ( In chemistry)

Answers

Answer:

Percent error = 2.8

Explanation:

Given data;

Actual value = 17.9 cm

Measured value = 17.4 cm

Percent error = ?

Solution:

Formula:

Percent error = [actual value - measured value / actual value] × 100

Now we will put the values in formula:

Percent error = [17.9 cm - 17.4 cm / 17.9 cm] × 100

Percent error = [0.5 cm /17.9 cm] × 100

Percent error = 0.028 × 100

Percent error = 2.8

Answer:

2.79%

Explanation:

I clicked on 2.79% and it was correct.

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