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4 years ago

Why are thermometers filled with alcohol instead for water?

2 answers:

8 0

Hello. Most thermometers would use mercury, but some use alcohol thanks to its freezing points. Alcohol freezes at -114 Celsius, while water freezes at 0 Celsius. If it was freezing outside, the water would freeze too, making the thermometer useless.

PilotLPTM [1.2K]4 years ago

8 0

Most thermometers are filled with mercury, but some are filled with alcohol. The reason we use alcohol instead of water is that alcohol has a lower freezing point (-114°C) than water (0°C).

Also, alcohol doesn't condensate on the top unlike water, which makes the reading of the thermometer easier to read.

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A student obtains a mixture of the chlorides of two unknown metals, X and Z. The percent by mass of X and the percent by mass of

Aleksandr-060686 [28]

Answer: The additional information that is helpful in calculating the mole percent of XCl(s) and ZCl(s) is the molar masses of Z and X

Explanation:

To calculate the mole percent of a substance, we use the equation:

$\text{Mole percent of a substance}=\frac{\text{Moles of a substance}}{\text{Total moles}}\times 100$

Mass percent means that the mass of a substance is present in 100 grams of mixture

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

We require the molar masses of Z and X to calculate the mole percent of Z and X respectively

Hence, the additional information that is helpful in calculating the mole percent of XCl(s) and ZCl(s) is the molar masses of Z and X

8 0

3 years ago

1. Give examples of a catalyst and the reaction it catalyses. 1

DENIUS [597]

Answer:

Explanation:

Iron Haber process = (making ammonia)

Vanadium (V) oxide = Contact process (a stage in making sulfuric acid)

Manganese dioxide = Decomposition of hydrogen peroxide (produces water and oxygen)

5 0

3 years ago

2.3 x 10²¹ particles H = __________ mol H (round to the nearest thousandth)

Natalka [10]

Taking into account the definition of avogadro's number, 3.82×10⁻³ moles of H are 2.3×10²¹ particles of H.

<h3>Avogadro's Number</h3>

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

Then you can apply the following rule of three: if 6.023×10²³ particles are contained in 1 mole of H, then 2.3×10²¹ particles are contained in how many moles of H?

amount of moles of H= (2.3×10²¹ particles × 1 mole)÷ 6.023×10²³ particles

amount of moles of H= 3.82×10⁻³ moles

Finally, 3.82×10⁻³ moles of H are 2.3×10²¹ particles of H.

Learn more about Avogadro's Number:

brainly.com/question/11907018?referrer=searchResults

brainly.com/question/1445383?referrer=searchResults

brainly.com/question/1528951?referrer=searchResults

7 0

3 years ago

Fe(ii) can be precipitated from a slightly basic aqueous solution by bubbling oxygen through the solution, which converts fe(ii)

strojnjashka [21]

0.0340 g O2

Step 1. Write the balanced chemical equation

4Fe(OH)^(+) + 4OH^(-) + O2 + 2H2O → 4Fe(OH)3

Step 2. Calculate the moles of Fe^(2+)

Moles of Fe^(2+) = 50.0 mL Fe^(2+) × [0.0850 mmol Fe^(2+)/1 mL Fe^(2+)]

= 4.250 mmol Fe^(2+)

Step 3. Calculate the moles of O2

Moles of O2 = 4.250 mmol Fe^(2+) × [1 mmol O2/4 mmol Fe^(2+)]

= 1.062 mmol O2

Step 4. Calculate the mass of O2

Mass of O2 = 1.062 mmol O2 × (32.00 mg O2/1 mmol O2) = 34.0 mg O2

= 0.0340 g O2

8 0

3 years ago

Albinism is a condition found in all vertebrates, such as the frog pictured below. This mutation prevents or reduces the product

lisov135 [29]

Organisms with albinism hard to find in nature because Albino coloration reduces an organism's chance of survival. The correct option is B

Explanation:

The congenital defect in which there is an absence of any pigmentation in organism or plant is termed albino. Tyrosinase enzyme controls the dose of melanin in the skin if there is a defect in Tyr gene the albinism occurs.

They are unable to protect itself from UV rays and are unable to protect itself from predators as they lack camouflage (in case of alligators). The beautiful colour of skin makes them prey for poaching.

The person with albinism have pink or red eye as the pigment of iris is also absent.

The albinism can be due to mutation. Heredity, diet, environment or disease.

In plants lack of chlorophyll is a condition of albinism which prevents photosynthesis and hence no survival.

6 0

4 years ago