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3 years ago

Please Help ASAP!! Will mark brainliest!!

Chemistry

1 answer:

Vinvika [58]3 years ago

3 0

Answer:

its pretty easy if u think about it the reason why is because your supposed to do that

Explanation:

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PLEASE HELP(2 questions)!!!!! BRAINLIEST IF FIRST AND CORRECTLY ANSWERED!!!

professor190 [17]

D
B
those are the correct answers

8 0

3 years ago

A 50.0 mL sample of waste process water from a food processing plant weighing 50.1 g was placed in a properly prepared crucible

RideAnS [48]

Answer:

TS (total solid, mg/L) = 57,174 mg/L

VS (volatile solid, mg/L) = 24,088 mg/L

Explanation:

First step to solve this problem is to know data and questions:

Data:

Sample volume = 50 mL

Sample weight = 50.1 g

P1 (weight empty crucible) = 17.1234 g

P2 (weight after drying a 103º in oven) = 19.9821 g

P3 (weight after incinatrion 550º) = 18.7777 g

Questions:

TS = ?

VS = ?

Formula:

We need to use formulas to calculate total solid (TS) and volatile solid (VS), these are:

$TS =\frac{(P2-P1)*\frac{1,000 mg}{1g} }{Sample volumen (L)}$

$VS = \frac{(P2-P3)*\frac{1,000 mg}{1g} }{Sample volume (L)}$

We have to transform mL to L so we will divide mL by 1,000 the sample volume:

$Sample Volumen (L) = 50 mL * \frac{1L}{1,000 mL} = 0.05 L$

In the formula the value of 1,000 results by the convertion factor to transform grams to miligrams (we have to multiplie by 1,000)

Now we need to replace data on previous formulas and we will get TS and VS expressed in mg/L:

$TS = \frac{(19.9821 g-17.1234g)*\frac{1,000 mg}{1g} }{0.05L} = 57,174mg/L$

$VS = \frac{(19.9821g-18.7777g)*\frac{1,000mg}{1g} }{0.05L}=24,088 mg/L$

We divide TS and VS formula by sample volume because the exercise is asking us to express the results in mg/L.

4 0

3 years ago

Why is thermal energy from the sun transferred to Earth through electromagnetic waves, instead of any other type of thermal ener

nlexa [21]

Answer: B) Electromagnetic waves can travel through empty space.

Explanation:

Conduction: This type of heat transfer happens when there is direct contact between the two object. Example: heating a pan on stove.

Convection: This type of heat transfer happens when there is a movement of fluid (liquid or gas) due to the movement of hot layers to the top and cold layers to the bottom which leads to convection currents. Example: Heating of swimming pool.

Radiation: This type of heat transfer happens when there is direct transfer of energy through empty space.The electromagnetic radiation from the surface of an object which is due to the object's temperature is radiation. Example: Heating of earth's surface.

4 0

3 years ago

What is the difference between a substance and mixture ?

snow_lady [41]

Explanation:

Matter can be categorized into substances and mixtures.

Matter is anything that has mass and occupies spaces.

Substances are distinct matter with the following properties:

All parts are the same throughout i.e homogeneous
Their composition is definite
They cannot be easily separated or broken down into simpler substances by physical means
Separation by physical means is not easy
They have a unique set of physical properties.

Mixtures have the following properties:

Their composition is indefinite i.e they consist of two or more elements and/or compounds in any proportion by mass
Their constituents retains their identity
They can easily be separated by physical means
They have a broad range of physical properties.

Learn more:

Mixtures brainly.com/question/1446244

#learnwithBrainly

6 0

4 years ago

What is most Lily true about the attractive forces between ions in a compound that is very soluble in water compared to a compou

vivado [14]

Answer:

Opposite poles of attract each other and make bonds.

Explanation:

Those compounds are soluble in water which have polar nature means that make poles with other atoms while on the other hand, those compounds which doesn't have polar nature are dissolve in non-polar solvent. The polar nature of compounds is due to their difference in electronegativities so in polar compounds opposite poles attract one another and make bonding with each other.

7 0

3 years ago