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docker41 [41]
3 years ago
11

Which of these is a typical property of a substance that is composed of atoms that are held together by covalent bonds?

Chemistry
1 answer:
ExtremeBDS [4]3 years ago
8 0
Electricity is conducted by free electrons or ions, such as delocalised electrons in metallic compounds or free moving cations and anions in aqueous solutions of ionic compounds.

atoms held together by covalent bonds do not contain free moving electrons or ions, so they do not conduct electricity in any state.
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25 g of a chemical is dissolved in 75 g of water. What is the percent by mass concentration of this chemical
Zanzabum

Answer:

300

Explanation:

4 0
3 years ago
The pressure of a sample of helium in a 200. ml. container is 2.0 atm. If the 5 points
just olya [345]

The pressure of the gas = 40 atm

<h3>Further explanation</h3>

Given

200 ml container

P = 2 atm

final volume = 10 ml

Required

Final pressure

Solution

Boyle's Law  

At a fixed temperature, the gas volume is inversely proportional to the pressure applied  

\tt \rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}

Input the value :

P₂ = P₁V₁/V₂

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3 0
3 years ago
List the properties of metals and nonmetals
kondor19780726 [428]

Lustrous (shiny)

Good conductors of heat and electricity.

High melting point.

High density (heavy for their size)

Malleable (can be hammered)

Ductile (can be drawn into wires)

Usually solid at room temperature (an exception is mercury)

Opaque as a thin sheet (can't see through metals)

3 0
3 years ago
Read 2 more answers
What is a litmus solution? How is it obtained?​
belka [17]
Litmus solution is generally a purple dye. The solution of Litmus is extracted from lichens. The Litmus solution is used as an indicator to determine the acidic and basic nature of a solution.Lichens plants belonging to the class of Thallophyta. The litmus solution method involves the grinding and crushing of lichens. In order to get the desired litmus solution, such dyes are then introduced to neutral water.

7 0
3 years ago
The mass % of C in methane CH4 is a) 74.87 b) 7.743 c) 133.6 d) 25.13 €) 92.26 159
Iteru [2.4K]

Answer:

a) 74.87 % carbon

Explanation:

Molecular mass of CH₄ is 16.042 g / mole.

Now we divide the following reasoning for 1 mole of methane:

if in        16.042 g of CH₄ there are 12.01 g of carbon

then in  100 g of CH₄ there are X g of carbon

X = (100 × 12.01) / 16.042= 74.87 % carbon

8 0
3 years ago
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