All categories

4 years ago

Which is most likely to stay solid at room temperature

Chemistry

2 answers:

LuckyWell [14K]4 years ago

5 0

What are your options

aleksandr82 [10.1K]4 years ago

4 0

Answer:

Food

Explanation:

Food is likely to stay solid at room temperature

You might be interested in

Which compound contains a radical? NaOH CO CO2 NaCl

Anna35 [415]

NaOH compound contains a radical.

<h3>Extra information:-</h3>

NAOH is the chemical formula of sodium hydroxide.

Sodium hydroxide is commonly known as caustic soda.

Uses of NAOH :-

Sodium hydroxide is used in the manufacturer of paper.

It is used for making detergents and soaps.

It is also used for making artificial textile fibers.

8 0

3 years ago

Consider a solution that contains both C6H5NH2 and C6H5NH3+. Calculate the ratio [C6H5NH2]/[C6H5NH3+] if the solution has the fo

Tcecarenko [31]

The question has incomplete information. The pH values are not discriminated. Let's do, as an example, to pH = 4.69.

Answer:

For pH = 4.69, [C₆H₅NH₂]/[C₆H₅NH₃⁺] = 0.708

Explanation:

C₆H₅NH₂ is a base, and, when in aqueous solution, forms a conjugate acid, which is C₆H₅NH₃⁺. The equilibrium between these two species makes a buffer, a solution that prevents the change in pH by the addition of base or acid.

The pH of a buffer can be calculated by the equation of Handerson-Halsebach:

pH = pKa + log[conjugate base]/[acid]

Where pKa = -logKa, and Ka is the equilibrium constant of the acid. For the base, the equilibrium constant, Kb, is equal to 7x10⁻¹⁰, and

Ka*Kb = Kw

Where Kw is the equilibrium constant for water 1.00x10⁻¹⁴, so Ka for the conjugate acid is:

Ka = 1.00x10⁻¹⁴/7.00x10⁻¹⁰

Ka = 1.43x10⁻⁵

pKa = 4.84

pH = 4.84 + log [C₆H₅NH₂]/[C₆H₅NH₃⁺] (By this step, the pH values given by the question must be substituted)

4.69 = 4.84 + log[C₆H₅NH₂]/[C₆H₅NH₃⁺]

log[C₆H₅NH₂]/[C₆H₅NH₃⁺] = - 0.15

[C₆H₅NH₂]/[C₆H₅NH₃⁺] = $10^{-0.15}$

[C₆H₅NH₂]/[C₆H₅NH₃⁺] = 0.708

8 0

3 years ago

(a) Calculate the density of a 374.5-g sample of copper if it has a volume of 41.8 cm3. (b) A student needs 15.0 g of ethanol fo

o-na [289]

Answer:

For a: The density of the sample of copper is $8.96g/cm^3$

For b: The volume of ethanol needed is 19.0 mL

For c: The mass of mercury is 340. grams

Explanation:

To calculate density of a substance, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$ ......(1)

For a:

Mass of copper = 374.5 g

Volume of copper = $41.8cm^3$

Putting values in equation 1, we get:

$\text{Density of copper}=\frac{374.5g}{41.8cm^3}\\\\\text{Density of copper}=8.96g/cm^3$

Hence, the density of the sample of copper is $8.96g/cm^3$

For b:

Mass of ethanol = 15.0 g

Density of ethanol = 0.789 g/mL

Putting values in equation 1, we get:

$0.789g/mL=\frac{15.0g}{\text{Volume of ethanol}}\\\\\text{Volume of ethanol}=\frac{15.0g}{0.789g/mL}=19.0mL$

Hence, the volume of ethanol needed is 19.0 mL

For c:

Volume of mercury = 25.0 mL

Density of mercury = 13.6 g/mL

Putting values in equation 1, we get:

$13.6g/mL=\frac{\text{Mass of mercury}}{25.0mL}\\\\\text{Mass of mercury}=(13.6g/mL\times 25.0mL)=340.g$

Hence, the mass of mercury is 340. grams

5 0

3 years ago

What is the name of the force exerted by blood on the walls of arteries

Digiron [165]

The name of the force exerted by blood on the wall of the arteries is blood pressure. Blood pressure is the force of blood against the walls of the arteries.

The answer is: Blood pressure.

3 0

3 years ago

What is the function of a mordant in gram staining?

Anna71 [15]

The function of mordant in the gram staining is to expose grams positive cell to the decolorizer which dissolves the lipids in the cell wall thus allowing the crystals violent-iodine to leach out of the cell. This facilitate the cell subsequently be stained by with safranin.

5 0

3 years ago

Read 2 more answers