Using prior knowledge to forecast what will happen next

. When a newspaper is left in direct sunlight for a few days, the paper begins to turn yellow. The yellow

34kurt

Physical Change

It is being changed by the sun

6 0

3 years ago

Identify the correct mole ratio for lithium sulfide

Zolol [24]

Can you send a picture of the work so I can help you out ?

7 0

4 years ago

On hot days, you may have noticed potato chip bags seem to inflate, even though they have not been opened. If I have a 250 mL ba

MrRa [10]

The first law here is Charles's law and the new volume will be 285.08 mL

Converting degree celsius to kelvin when solving gas laws problem.

kelvin = degree celsius + 273.15

Kelvin = 19 + 273.15 = 292.15 K

Kelvin = 60 + 273.15 = 333.15 K

Given Data:

V1 (initital volume) = 250 ml

T1 (initial temperature) = 19°c or 292.15 K

V2 (final volume) = unknwon ?

T2 (final temperature) = 60°c or 333.15 K

Charles' law which states that volume is directly proportional to temperature when the amount and pressure of the gas are constant.

Applying the formula, we get

V2 = V1T2 / T1

= 250 ml × 333.15 K / 292.15 K (cancel kelvin unit)

= 83287.5 ml / 292.15

= 285.08 ml

The new volume will be 285.08 ml

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6 0

1 year ago

Consider a mixture of NaCl and NaNO3 that is 31.8% Na by mass. Calculate the percentage by mass of NaCl in the mixture.

lutik1710 [3]

Answer: The percentage by mass of NaCl in the mixture is 38.5 %

Explanation:

To calculate the mass percentage of element in compound, we use the equation:

$\text{Mass percent of element}=\frac{\text{Mass of element}}{\text{Mass of compound}}\times 100$ .......(1)

For NaCl:

Mass of sodium element = 23 g

Mass of NaCl = 58.5 g

Putting values in equation 1, we get:

$\text{Mass percent of sodium element}=\frac{23g}{58.5g}\times 100=39.32\%$

Mass fraction of sodium metal in NaCl = 0.3932

For $NaNO_3$ :

Mass of sodium element = 23 g

Mass of $NaNO_3$ = 85 g

Putting values in equation 1, we get:

$\text{Mass percent of sodium element}=\frac{23g}{85g}\times 100=27.1\%$

Mass fraction of sodium metal in sodium nitrate = 0.271

Let us assume the mass fraction of NaCl in the mixture is 'x'

So, the mass fraction of $NaNO_3$ in the mixture will be '(1-x)'

We are given:

Percent by mass of Na in the mixture = 31.8 %

Mass fraction of Na in the mixture = 0.318

Evaluating the mass fraction of NaCl in the mixture:

$[(x\times 0.3932)+((1-x)\times 0.271)]=0.318$

x = 0.385

Percent by mass of NaCl in the mixture will be = $(0.385\times 100)=38.5\%$

Hence, the percentage by mass of NaCl in the mixture is 38.5 %

4 0

3 years ago

Which of the following is a property of an ionic compound?

svet-max [94.6K]

Ionic compound is a chemical compound composed of ionsheld together by electrostatic forces termed ionic bonding. The compound is neutral overall, but consists of positively charged ions called cations and negatively charged ions called anions. These can be simple ions such as the sodium (Na+) and chloride (Cl−) in sodium chloride, or polyatomic species such as the ammonium (NH+
4) and carbonate (CO2−
3) ions in ammonium carbonate. Individual ions within an ionic compound usually have multiple nearest neighbours, so are not considered to be part of molecules, but instead part of a continuous three-dimensional network, usually in a crystalline structure.

Ionic compounds containing hydrogen ions (H+) are classified as acids, and those containing basic ions hydroxide (OH−) or oxide (O2−) are classified as bases. Ionic compounds without these ions are also known as salts and can be formed by acid–base reactions. Ionic compounds can also be produced from their constituent ions by evaporation of their solvent, precipitation, freezing, a solid-state reaction, or the electron transfer reaction of reactivemetals with reactive non-metals, such as halogen gases.

Ionic compounds typically have high melting and boiling points, and are hardand brittle. As solids they are almost always electrically insulating, but when melted or dissolved they become highly conductive, because the ions are mobilized.

This is answer

high melting point
malleable

3 0

4 years ago