Engineering chemistry

Answers

Answer 1

Answer:

it wont let me see it

Explanation:


Related Questions

What is the mass of 0.5 moles of hydrogen gas

Answers

Answer:

1G

Explanation:

Which of the following is a compound? *
A. aluminum
B. carbon
C. oxygen
D. sugar

Answers

CARBON IS A COMPOUND

Answer:

C. OXYGEN

Explanation:

What happens when white light passes through a blue then a yellow filter
Answer quick

Answers

Answer:

At the end, no light passes through.

Explanation:

First, when white light enters a blue filter, only blue light is allowed to pass through, and all the other components of light are absorbed. When blue light then reaches the yellow filter, it absorbs the blue light, because it is designed to allow only the yellow component of the light to pass through. White light consists of the seven rainbow colours: red, orange, yellow, green, blue, indigo and violet.

why is there no base unit for volume

Answers

Answer: Volume. Litre (L) and millilitre (mL) are non-SI units, but because they are easier to write and pronounce, they are in common use.

Explanation: I think the explanation is the answer also

Please help me ASAP I couldnt copy paste the table so I added a screenshot Please I really need help!!!

Answers

Answer:

2.04 Thermal Energy and Chemical Change Lab Report

Explanation:

The crystal size of an igneous rock is described as its _____.​

Answers

Explanation:

The crystal size of an igneous rock is described as it's texture

The city council of a small town wanted to add fluoride to their water so that all the residents would have healthier teeth. The mayor had read that ionic compounds must be used to get the fluoride into water. He looked up fluorine-containing compounds and came up with the following list. ​
NaF NF3 SiF4 CaF2 NH4F​

Using academic vocabulary in paragraph form, discuss the following: ​

Explain which compound(s) could produce fluoride ions in the water. In your response, be sure to include: ​
° which of the listed compounds are ionic and which are covalent. ​
° how ionic and covalent compounds are different. ​
° why only ionic compounds would produce fluoride in water.​

Answers

Answer:NaF is ionic. NF3 is covalent. SiF4 is ionic. CaF2 is Ionic and  NH4F is also ionic. Ionic compounds transfer electrons whereas covalent compounds share electrons hence the word "co". Also, ionic compounds are formed with metal and nonmetal. Where a covalent is with 2 nonmetals. Only ionic compounds would produce fluoride in water because ionic compounds can dissolve in water and covalent compounds cant.

The compounds that can be used for the release of fluorine in water are NaF, [tex]\rm SiF_4[/tex], [tex]\rm CaF_2[/tex], and [tex]\rm NH_4F[/tex].

The ionic compounds are formed by the transfer of electrons between the atoms of the compounds. The ionic bonds are weaker and are easy to dissociate in the aqueous solution.

The covalent compounds are formed by the sharing of electrons between the atoms. Since there is sharing, there has been a strong bond, that has been hard to dissociate.

The Mayor has to release Fluoride in the water, thus ionic compounds are preferred that have the easy release of fluorine.

From the given compounds:

NaF = Ionic compound[tex]\rm NF_3[/tex] = Covalent compound[tex]\rm SiF_4[/tex] = Ionic compound[tex]\rm CaF_2[/tex] =  Ionic compound[tex]\rm NH_4F[/tex] =  Ionic compound

Thus the compounds that can be used for the release of fluorine in water are NaF, [tex]\rm SiF_4[/tex], [tex]\rm CaF_2[/tex], and [tex]\rm NH_4F[/tex].

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Choose the names of the substances for reactants of the equation
2H2 + O2—— 2H2O

Answers

the reactants are hydrogen and oxygen NOT water, WATER is the product

The names of the substances for the reactants in the chemical equation 2H₂ + O₂ → 2H₂O are; Hydrogen gas (H₂) and Oxygen gas (O₂). Option A and C is correct.

Hydrogen gas (H₂) - This is the molecular form of hydrogen, consisting of two hydrogen atoms bonded together.

Oxygen gas (O₂) - This is the molecular form of oxygen, consisting of two oxygen atoms bonded together.

In a chemical equation, the reactants are the substances that undergo a chemical reaction to form new products. In this case, the reactants are hydrogen gas (H₂) and oxygen gas (O₂). The arrow (→) in the equation represents the direction of the reaction, indicating that hydrogen gas and oxygen gas react to form water (H₂O).

The coefficient 2 in front of H₂ and H₂O indicates that two molecules of hydrogen gas react with one molecule of oxygen gas to produce two molecules of water. The balanced chemical equation shows the stoichiometry of the reaction, indicating the number of molecules of each reactant and product involved in the reaction.

Hence, A. C. is the correct option.

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--The given question is incomplete, the complete question is

"Choose the names of the substances for reactants of the equation

2H₂ + O₂ → 2H₂O Options; A) Hydrogen B) Water C) Oxygen."--

What is the mass in grams of 0.0015 mol of aspirin (C9H8O4)

Answers

Answer:

116.1 g

Explanation:

Answer:

Answer is 0. 508grams I'm not sure if I'm right but it might be the answer.

When hydrogen sulphide is burnt in oxygen to form sulphur(is) oxide and what. How does the oxidation number of sulphur change?

Answers

Answer:

Explanation:

Hydrogen sulphide burns in air to form sulphur dioxide: 2H2S + 3O2 → 2H2O + 3SO2. In this reaction, the sulphur is oxidized from -2 to +4. In the reaction H2S + 2O2 → H2SO4 + 790 kJ/mol, the oxidation is from -2 to +6.

When hydrogen sulphide is burnt in oxygen to form sulphur dioxide and water (H₂O), the oxidation number of sulfur changes from -2 in H₂S to +4 in SO₂.

When hydrogen sulfide (H₂S) is burnt in oxygen (O₂) to form sulfur dioxide (SO₂) and water (H₂O), the oxidation number of sulfur changes from -2 in H₂S to +4 in SO₂.

The balanced chemical equation for the reaction is:

2 H₂S + 3 O₂ → 2 SO₂ + 2 H₂O

In hydrogen sulfide (H₂S), sulfur has an oxidation number of -2 because hydrogen has an oxidation number of +1, and the overall molecule is neutral (since it is uncharged).

In sulfur dioxide (SO₂), sulfur has an oxidation number of +4 because oxygen has an oxidation number of -2, and the overall molecule is neutral.

The change in the oxidation number of sulfur can be seen as follows:

H₂S (initial state) → SO₂ (final state)

-2 (initial oxidation number of sulfur) → +4 (final oxidation number of sulfur)

During the reaction, sulfur is oxidized from an oxidation state of -2 in hydrogen sulfide to +4 in sulfur dioxide. This means that sulfur loses electrons during the reaction, leading to an increase in its oxidation number. The oxygen molecules in the oxygen gas (O₂) act as the oxidizing agent, causing sulfur to undergo oxidation and form sulfur dioxide.

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What is the initial concentration of a solution if 40.0 mL is diluted to make 720 mL of a 0.45 M solution?

Answers

Answer:

8.1 M

Explanation:

What is the initial concentration of a solution if 40.0 mL is diluted to make 720 mL of a 0.45 M solution?

LET Y = INITIAL CONCENTRATION

SO

Y TIMES 40/720 = 0.45 m

SO

Y= (0.45) X 720/40=

0.45 X 72/4 =

0.45 X 18 =8.1 M

Concentration is related to the mass and volume. 8.1 M  initial concentration of a solution is required if 40 ml is diluted to make 720 ml of a 0.45 M solution.  

What is initial concentration ?

The first measured concentration of a compound in a substance is called as initial concentration. Initial concentration also measure with the help of molarity.

Write out the equation C = m ÷ V, where m is the mass of the solute and V is the total volume of the solution. Substitute  the values you found for the mass and volume, and divide them to find the concentration of your solution.  

Let X is the initial concentration,

so, X times 40 ÷ 720 = 0.45

X = ( 0.45 ) × ( 720÷40)

= 0.45 × 18

= 8.1 M

Hence, 8.1 M  initial concentration of a solution is required .

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classification of animals is done why​

Answers

Answer:

in order to reduce and simplify the study of the animals

to be able to group animals in their appropriate groups

Explanation:

when we classify organisms that means that we take a large number of organisms and group them to a single and correct group that will help the scientists across the world to identify organisms easily

Please help me out !!

Answers

27Hq)+3816(7/ 23q09)

Calculate the number of moles in 400g of Tio2

Answers

Answer:

5.01 moles

Explanation:

Calculate the number of moles in 400g of Tio2

first, write the formulas correctly

Calculate the number of moles in 400g of TiO2

capitalize the first letter of your elements

the molar mass of TiO2 is

47.88 +2X16.00 =47.88  +32.00 = 79.88 gm/mole

(to 3 sig fig = 79.9 gm/mole

400 gm/79.9 gm/mole = 400/79.9 mole gm/gm =

400/79.9 moles = 5.01 moles

3. Explain how the body uses electrolytes to regulate fluid balance. Describe Acid-base balance in the body.

Answers

Answer:

Explanation:

1 Electrolytes, particularly sodium, help maintain fluid balance through osmosis. Osmosis is a process where water moves through the wall of a cell membrane from a dilute solution (more water and fewer electrolytes) toward a more concentrated solution (less water and more electrolytes).

2 acid base balance in the body

our body's pH balance, also referred to as its acid-base balance, is the level of acids and bases in your blood at which your body functions best. The human body is built to naturally maintain a healthy balance of acidity and alkalinity. The lungs and kidneys play a key role in this process.

How does a vaccine impact the individuals who receive it?
O They will likely still develop the disease but will not die from i
O They will not be able to get the disease but can still pass it or
O Their bodies will remember the disease and be able to fight it
O They will become sick with the illness but then recover.
Answer fast pls

Answers

Answer:

I want to say (A) but i also want to say (C) but i can be wrong. most likely (C)

Explanation:

hope this helps lol and have a great day

Answer:

honestly this is kind of an opinionanated question because some people think that the vaccine dosen't work. Like I think that, but some other people might think differently so im gonna go with answer c.

Explanation:

please help!!!

The sky is blue because blue light is scattered in the sky. What does
scattering mean?
A. dust particles are refracting light
B. dust particles are absorbing light
C. dust particles are transmitting light
D. dust particles are reflecting light

Answers

Correct Option

B. dust particles are absorbing light

Explanation:

When light travels through a medium, it interacts with the medium and this causes the scattering of light. - Photons are absorbed by molecules in the medium, and this causes the molecules to vibrate and then re-emit the photons. ... - The scattering of light increases with frequency

Answer:

C

Explanation:

the answer is C. dust particels are reflecting light. hope this helps

Why must protein digesting enzymes be stored in the inactive form

Answers

Answer:

To shield the organs and glands from the enzymes' digestion, protein digesting enzymes are released in an inactive state. If they are discharged in an active state, they begin digesting the glands that transport them as well as the release site.

Explanation:

11. Which is the solubility product expression for Na3PO4(s)?

Answers

Answer: B

Explanation: the 3 in Na3PO4(s) belong to the sodium atom (Na). so in any of these equations, the 3 would have to be with Na.

A- the 3 is along w the PO4, which would make it part of that bond

C- there is no 3 at all for Na in this choice, making it incorrect

D- Again, the 3 is placed on the other half of the bond

Why is the spectroscope scale illuminated?

Answers

Answer:

The spectroscope scale is illuminated so that one can know exactly where the wavelengths of the lines are falling along.

GIVING BRAINLY
The speed of sound waves in air is 340 m/s. Its frequency is 750 Hz. What is its wavelength ?

Answers

Answer:

wavelength is 0.77 m

Explanation:

wavelength is y is equal to FB is equal to 44 0340

A diver breathes a heliox mixture with an oxygen mole fraction of 0.050. What must the total pressure (in atm) be for the partial pressure of oxygen to be 0.21 atm?

Answers

Answer:

4.2 atm

Explanation:

Dalton’s Law of Partial Pressures

PA = XA(PT)

Partial pressure of A = mole factor of gas A x total pressure of all gases

PA = 0.21 atm

XA = 0.050

PT= ?

0.21atm= 0.050(PT)

0.21/0.050 = PT

PT = 4.2 atm

The total pressure of gases must be 4.2 atm for the partial pressure of oxygen to be 0.21 atm.

How to calculate partial pressure?

The partial pressure of a gas can be calculated using Dalton's law of partial pressure equation as follows:

PA = XA(PT)

Where;

PA = partial pressure of oxygen XA = mole factor of oxygenPT = total pressure of all gases

Based on the information given in this question;

PA = 0.21 atmXA = 0.050PT= ?

0.21 atm = 0.050 (PT)

0.21/0.050 = PT

PT = 4.2 atm

Therefore, the total pressure of gases must be 4.2 atm for the partial pressure of oxygen to be 0.21 atm.

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How would you gather data to in order to determine the density of a marble

Answers

The average mass of a marble can be determined by dividing the total mass of the marbles by the total number of marbles: average mass of a marble.

To find the density of any object, you need to know the Mass (grams) of the object, and its Volume (measured in mL or cm³). Divide the mass by the volume in order to get an object's Density.

Use the formula p=m/V, or density (p) is equal to mass (m) divided by volume (V).

To determine the density of a marble, we must know its mass and volume.

In order to determine the density of any substance we need to know its mass and volume.

Let's understand "Density".

The density of a substance is its mass per unit volume. It is represented with "ρ" this symbol.It can be given by the formula which is shown below: ρ= [tex]\frac{m}{V}[/tex] where m is the mass of the substance and V is the volume.Density indicates how much of a substance occupies a specific volume at a defined temperature and pressure. The density of a substance can be used to define the substance.

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how does a battery get its power?

Answers

Answer:

Batteries get its power from the stored energy inside it- chemical energy- which is then converted into electrical energy. The flow of the electrons allow the electric current to do work.

Explanation:

chemists use solution concentration units to

Answers

…Indicate the number of moles of solute per liter of solution. This helps identify the molarity or the the value of solute inside the solution.

Spirit of Australia, a hydroplane boat, made speed records by traveling 239 miles in 0.75 hours (45 minutes). What is its record- breaking speed?

Answers

Using the imperial system of measurement (in miles per hour):

239 miles per 0.75 hours
239 miles / 45 minutes = 5.3111 miles per minute
5.3111 miles per minutes X 60 minutes per hour = 318.67 miles per hour ~ 319 mph

Answer:

the answer is 319 mph

Explanation:

you do 239/.75 (45 minutes will get you a different answer)

U ever get an answer

Answers

yesn’t. they are either wrong or links

A vapor volume of 1.17 L forms when a sample of liquid acetonitrile, CH3CN, absorbs 1.00 kJ of heat at its normal boiling point (81.6 °C and 1 atm). What is Hvap in kilojoules per mole of CH3CN?​

Answers

The heat of vaporization of CH3CN is obtained from the question as 25 KJ/mol.

We can obtain the number of moles from;

PV = nRT

P = 1 atm

V = 1.17 L

n = ?

R = 0.082 atm LK-1mol-1

T = 81.6 °C + 273 = 354.6 K

n = PV/RT

Substituting values;

n =  1 atm × 1.17 L/0.082 atm LK-1mol-1 × 354.6 K

n = 0.04 moles

Using; q = n·ΔHv

q = Heat absorbed

n = number of moles

Hv  = Heat of vaporization

ΔHv = q/n

ΔHv = 1.00 × 10^3/0.04

ΔHv = 25 KJ/mol

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if 10.5 grams of liquid water is boiled how many grams of water vapor will then form ?

Answers

Answer:

It depends

Explanation:

This could vary depending on the exact temp, time and minerals. something with alot of salt boils quicker than something without it, so 10.5 grams?

The particular temperature, the passage of time, and the minerals could all affect the amount of grams of liquid water.

What are minerals?

Minerals are defined as a naturally crystallized element or chemical compound that was created through geological processes. Natural materials are those that form on their own, such as minerals. Minerals don't droop, melt, or evaporate since they are solids. In contrast to the carbon compounds found in living organisms, minerals are inorganic. Minerals are crystalline: They have a unique atomic composition and arrangement.

Temperature is defined as a measure of hotness or coldness expressed in terms of any number of arbitrary scales that shows the direction that heat energy will naturally flow, i.e., from a hotter body to a colder body. The three temperature scales that are now in use are Kelvin, Celsius, and Fahrenheit. Food, beverages, agriculture, and medical care for both people and animals all depend heavily on temperature.

Thus, the particular temperature, the passage of time, and the minerals could all affect the amount of grams of liquid water.

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Your private gas collection consists of the four following gases, with each gas in a separate container, and exactly 1.0 g of each gas: CO2(g). Ne (g), Cl2
(g), and H2S (g). Which of your prized gases occupies the smallest volume at standard temperature and pressure (STP)?
H2S (g)
CO2 (g)
Cl2 (g)
Ne (g)

Answers

Answer:Cl2

Explanation:each gas is 1 gm and has the same P andT. The gas with the highest molar mass will have the lowest volume with least moles. Cl2 wins the prize

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The functions r and s are defined as follows.r(x) = -x +1s(x)=2x2-1Find the value of r(s(4)).numeral composition of functions will giv ebrainliest if 20 articles cost $90,then the cost of 9 articles is Imagine that you are getting ready to open up your own restaurant. You have been working for months to get the space ready, decorated, and equipped with all of the best cooking tools, tableware and cutlery, and dcor. Youve hired a great team of employees, printed the menus, and are so close to being ready for your grand opening.There is just one thing left to pick out, order, and properly storethe food!!For this lab, you will use a combination of information from the unit as well as online research to create a plan for the food items you will need. This will be your master list/plan that will help you take your restaurant from almost ready to totally ready!First and foremost, while you do not need to create an entire menu for your restaurant, you should identify the type of restaurant that you are opening. This will help guide your list and plan for the foods that you will need to stock.For each of the following items, you will need to list at least five examples from that food category, describe how often you will need to purchase more of that item, and how you will store them. You may need to do extra research to see how often typical restaurants with menus similar to yours restock their items:Produce (fruits and vegetables)Proteins (meats, fish, legumes)Dry goods (legumes, pastas, flours)Seasonings (herbs, spices, oils, vinegars) At the start of the school year, sportswriter say that your schools football team has a 40% of being the best team in the league A seed sprouted and grew 2/3 of a foot in 3 months. What was its rate of growth in feet per month? What does it mean that " memory is organized in semanticnetworks What is the first step in solving this equation?3(2x + 6) - 4x = 2(5x - 2) + 6Use the subtraction property of equality to subtract 6 from both sides.Use the addition property of equality to add 4x to both sides.Combine the like terms on each side of the equation.O Use the distributive property on each side of the equation. Simon is driving his car on a highway at a constant speed. The below table shows the relationship between the amount ofgasoline left in his car and the distance traveled on the highway. Order , 16, 3 from greatest to least Solve the math problem Can anyone fr help me with this? How did epigenetics develop What is the equation of the line?? A liability created by buying goods or services on credit is typically recorded to: please helpppppppppppppp Write an expression that represents the perimeter of the triangle. need help, im confused Write the following equation in the general form Ax + By + C = 0.1/2 y - 1/3x - 1 = 0-2x + 3y - 6 = 02x - 3y - 6 = 02x - 3y + 6 = 0 A bag with 10 marbles has 2 yellow marbles, 4 red marbles, and 4 blue marbles. A marble is chosen from the bag at random. What is the probability that it is not yellow?Write your answer as a fraction in simplest form.