CHEMISTRY MIDDLE SCHOOL

If a certain gas occupies a volume of 10 L when the applied pressure is 5.0 atm , find the pressure when the gas occupies a volume of 2.5 L .

Answers

Answer 1
Answer:

We assume the change in volume occurs at constant temperature and so we  use the Boyle's law formula P_1V_1=P_2V_2.

We are given the initial volume and pressure as well as as final volume, the question wants the final pressure P_2

So we make P_2 the subject of the formula

P_2= (P_1 V_1)/(V_2) = (5*10)/(2.5)= 20 atm

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What is 'Lo Salt' used for?I already know it can be used in exactly the same way as regular salt, and that it can be used to supplement your potassium intake. I was wondering if there are any more for me to write down. Thanks to anyone who replies!

Answers

It offers a route to reducing sodium intake.

Hope I helped.

The box in the picture begins motionless, and then both forces are applied at the same time. Describe the resulting motion of the box. A) The box will not move. B) The box will move to the left. C) The box will move to the right. D) The box will move to the left and then the right.

Answers

It seems that you have missed to attach the given image for us to answer this question, but anyway, here is the answer. Based on the picture of a box which is motionless, the resulting motion of the box would be option B. The box will move to the left. Hope this answer helps.

The force being applied toward the right is greater. So the box will move in the direction of the greater force being applied. The box will move toward the right. Hope this helps!!!

C. If 62.9 g of lead (II) chloride is produced, how many grams of lead (II) nitrate werereacted?

Answers

Answer:

Mass = 76.176 g

Explanation:

Given data:

Mass of lead(II) chloride produced = 62.9 g

Mass of lead(II) nitrate used = ?

Solution:

Chemical equation:

Pb(NO₃)₂  +  2HCl     →     PbCl₂ + 2HNO₃

Number of moles of lead(II) chloride:

Number of moles = mass/molar mass

Number  of moles = 62.9 g/ 278.1 g/mol

Number of moles = 0.23 mol

Now we will compare the moles of lead(II) chloride with Pb(NO₃)₂ from balance chemical equation:

                            PbCl₂        :          Pb(NO₃)₂

                               1             :             1

                             0.23         :            0.23

Mass of Pb(NO₃)₂:

Mass = number of moles ×  molar mass

Mass = 0.23 mol × 331.2 g/mol

Mass = 76.176 g

The model is made of an ionic compound of aluminum and chlorine. Aluminum has an oxidation number of 3 and chlorine has an oxidation number of -1. Based on the evidence, predict the chemical formula, chemical name and properties of the compound between aluminum and chlorine.

Answers

Answer:

                    Chemical Formula: AlCl₃

                    Chemical Name: Aluminium Chloride

                    Properties are given below.

Explanation:

Chemical Formula:

                              Chemical formula depicts the total number of elemants forming a particular compound. It is common that all compounds are neutral in nature despite of the internal charges they contain. As given Aluminium has a + 3 charge while Chlorine has a -1 charge, therefore, to make a neutral compound we will require 3 Cl⁻ ions to neutralize one Al³⁺ ion hence, the chemical formula will be AlCl₃.

Chemical Name:

                              According to rules ionic compounds are named by naming the positive part first followed by negative part. In this case Al³⁺ being is name d first followed by Cl⁻ (remember the -ine in anions is replaced by -ide) hence, this compound will be name as Aluminium Chloride.

Properties:

                 Few physical and chemical properties of AlCl₃ are;

 (i) It melts at 192.4 °C

 (ii) Highly Soluble in water

 (iii) It has a density of  2.48 g/cm³

 (iv) Poor conductor of electricity

 (v) It is used as catalyst in many organic reactions

 (vi) Reacts with silver nitrate to form silver chloride and Aluminium Nitrate

Identify some of the signs that has a chemical change has occurred

Answers

The object can no longer be returned to its original self, like ashes can't turn back to wood. The color changes, and bubbles.Also odor change, and gas formation.

How many moles of cobalt (Co) atoms are there in 6.00 times 10 to the 9th power cobalt atoms?

Answers

Answer:

In 6.00 * 10^9 of cobalt atoms there are 6.00 * 10^9 mol Co

Explanation:

Step 1 : Identify the relationship between 1 mole Cobalt  and Avogadro's number of atoms.

1 \text{mole Cobalt } = 6.022 * 10^(23) \text{ atoms of cobalt }

Avogadro’s number is  number of units present in one mole of any substance (defined as its molecular weight in grams)

Step 2:  Divide the given atoms of cobalt by the number of atoms per mol.

Given atoms of cobalt is  6.00 * 10^9

Now by performing division

Number of moles of cobalt (Co) atoms in  6.00 * 10^9  cobalt atoms is

= (6.00 * 10^9)/(6.022 * 10^(23))

= 0.996 * 10^9 * 10^(-23)

= 0.996 * 10^(9 -23)

=0.996 * 10^(-14)
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