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2 years ago

Identify the phrases that generally apply to molecular compounds a contain metals and nonmetals

Chemistry

2 answers:

LiRa [457]2 years ago

4 0

Ionic compounds/bonds are between metals and non metals

galben [10]2 years ago

3 0

often are gases or liquids
have low melting points
use covalent bonding

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A gas is initially at a pressure of 0.43 atm, and a volume of 11.7 liters. Then the pressure is raised to 3.61 atm and the volum

lukranit [14]

Answer:

D. 91.98K

Explanation:

The General Gas Law equation is given by,

$\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}$

From the question,

the initial pressure,

$P_1 = 0.43 \: atm$

the initial volume,

$V_1 = 11.7 \: litres$

the final temperature,

$T_2=627K$

the final pressure,

$P_2=3.61atm$

the final volume,

$V_2=9.5litres$

Making

$T_1$

the subject of the expression, we obtain

$T_1= \frac{P_1V_1T_2}{P_2V_2}$

By substitution,

$T_1= \frac{0.43 \times11.7 \times627}{3.61 \times9.5}$

$T_1=91.980K$

Hence the initial temperature was 91.98 K

4 0

1 year ago

Read 2 more answers

A buffer is prepared by adding 100 mL of 0.50 M sodium hydroxide to 100 mL of 0.75 M propanoic acid. Is this a buffer solution,

Yanka [14]

The answer: is yes, It is a buffer solution.

first, we need to get moles of sodium hydroxide and propanoic acid:

moles NaOH = molarity * volume

= 0.5M * 0.1 L = 0.05 moles

moles propanoic acid = molarity * volume

= 0.75 M * 0.1 L = 0.075 moles

[NaOH] at equilibrium = 0.05 m

[propanoic acid ] at equilibrium = 0.075 - 0.05 = 0.025 m

when Pka for propanoic acid (given) = 4.89

so by substitution:

∴PH = Pka + ㏒[NaOH]/[propanoic acid ]

∴ PH = 4.89 + ㏒ 0.05 / 0.025

= 5.19

7 0

1 year ago

In the equilibrium system described by: PO43-(aq) + H2O(1) = HPO42-(aq) + OH-(aq) Brønsted-Lowry theory would designate: A) PO43

Kamila [148]

Answer:

The correct option is: B) H₂0 and OH⁻ as a conjugate pair

Explanation:

According to Brønsted-Lowry theory, the acids are the chemical substances that form a conjugate base by donating a proton and bases are the chemical substances that form conjugate acid by accepting a proton.

In the given chemical reaction: PO₄³⁻(aq) + H₂O(l) ⇄ HPO₄²⁻(aq) + OH⁻(aq)

According to Brønsted-Lowry theory, PO₄³⁻ and OH⁻ are bases. Whereas, H₂O and HPO₄²⁻ are acids.

Also, PO₄³⁻ and HPO₄²⁻ are the conjugate acid-base pair; and H₂O and OH⁻ are the conjugate acid-base pair.

6 0

2 years ago

Convert 3.8 Km/sec to miles/year

weqwewe [10]

We are asked to convert from units of kilometer per second to units of miles per year. To do this, we need a conversion factor which would relate the different units involved. We either multiply or divide this certain value to the original measurement depending on what is asked. From literature, we will find that 1 mile is equal to 1609 meters and 1000 m is equal to 1 kilometer. Also, we will find that 3600 s is equal to 1 hr, 24 hr is equal to 1 day and 365 days is equal to 1 year. We do the conversion as follows:

3.8 km / s ( 1000 m / 1 km ) ( 1 mile / 1609 meters ) ( 3600 s / 1 hr ) ( 24 hr / 1 day ) ( 365 days / 1 year ) = 74479055.3 miles per year

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1 year ago

3 ways of improving the quality of an indigenous soap

Monica [59]

Answer : Below are three ways described in brief for improving the quality of indigenous soap.

1) Add virgin coconut oil which serves as a softener and betel leaf extract. It is used to improve the quality of soap as an antimicrobial agent.

2) Add activated charcoal black granules or powder to the soap, it removes maximum dirt from the skin.

3) Adding a filler which will increase the shelf life of usage of the soap will also improve its quality.

4 0

1 year ago