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4 years ago

Paper is stable at room temperature in the presence of oxygen (O2) because it requires ____________ to start the reaction.

Chemistry

1 answer:

larisa86 [58]4 years ago

8 0

Answer:

Energy

Explanation:

Paper is oxidized in the presence of oxygen. This reaction however proceeds very slowly until energy is supplied to the system. This implies that the reaction is not spontaneous at room temperature. A spontaneous reaction takes place without any need for external supply of energy.

The need for supply of external energy must be as a result of the high activation energy required for the reaction to go to completion. If a chemical reaction has a high activation energy, it will require an external supply of energy in order for such reaction to occur.

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How many grams of NaCl are required to make 150.0mL of a 5.000 m solution

Yanka [14]

The number of grams of NaCl required to make 150.0 ml of a 5.000m solution is 43.875 grams

calculation

Step 1: calculate moles of NaCl

moles= molarity x volume in liters

volume in liters = 150.0 ml/1000= 0.15 l

moles is= 5.000mol/l x0.15 l =0.75 moles

Step2 : find mass

mass= moles x molar mass

molar mass of NaCl= 23 +35.5 = 58.5 g/mol

mass= 0.75 moles x58.5 g/mol = 43.875 grams

6 0

4 years ago

Which actions are part of a system of methodical tests and refinements specific to technological design? 1 documenting, tinkerin

telo118 [61]

Answer:

1. documenting, tinkering, testing

Explanation:

Technological design is defined as the process of study, design and development of new technologies.

There are some action in the methodical tests and refinements specific to technological design include documenting, tinkering, testing.

Documenting includes collecting all the information about the design and develop the product, tinkering involves repairing or adjust the issues found in the development, and testing helps to evaluate if the product is ready to work as it is supposed to.

Hence, the correct answer is "1."

6 0

3 years ago

: If you know that a ∝ b and a ∝ c, then you can also say that a ∝ bc, or the product of b and c. Take the above three proportio

aleksley [76]

Answer:

V ∝ abc

Explanation:

This task is a joint variation task involving only direct proportionality:

Direct variation is one in which two variables are in direct proportionality to each other. This means that as one increases, the other variable also increases and vice - versa.

Joint variation is one in which one variable is dependent on two or more variables and varies directly as each of them.

In this exercise:

If a ∝ b and a ∝ c, then a ∝ bc

Taking the above three proportionalities,

V ∝ a ∝ b ∝ c

V ∝ a ∝ bc

V ∝ abc

3 0

3 years ago

2 NaClO3→ 2 NaCl + 3 O2 How many moles of O2 are produced when 40g of NaCl are formed?

Y_Kistochka [10]

Answer:

75.6

Explanation:

7 0

3 years ago

An aqueous NaClNaCl solution is made using 111 gg of NaClNaCl diluted to a total solution volume of 1.20 LL .Calculate the molal

Aliun [14]

Answer:

The answer to your question is m = 1.6

Explanation:

Data

mass of NaCl = 111 g

volume of water = 1.2 L

Molality = ?

Formula

Molality = number of moles / volume (L)

Process

1.- Calculate the moles of NaCl

Molecular mass = 23 + 35.5 = 58.5 g

1 mol of ------------------- 58.5 g

x -------------------- 111 g

x = (111 x 1) / 58.5

x = 1.897 moles of NaCl

2.- Calculate the mass of water

density of water = 997 kg/m³

mass = volume x density

mass = 0.0012 x 997

mass = 1.19 kg

3.- Calculate molality

m = 1.897/1.19

m = 1.6

7 0

3 years ago