A chemist uses hot hydrogen gas to convert chromium(III) oxide to pure chromium. How many grams of hydrogen are needed to convert 76
grams of chromium(III) oxide, Cr203?
Cr2O3 + H2Cr + H2O

Answer:

NO2=Nitrogen dioxide

KCL=potassium chloride

NH3=Ammonia

The number of moles of HCl produces 400.0 mL of 1.5M MgCl₂ is equal to 1.20 moles. Therefore, option (C) is correct.

A mole can be defined as a standard unit that is used to find a huge number of quantities of molecules, atoms, ions, or other particular particles.

The number of entities in one mole was found to be equal to 6.023 × 10²³ which is called Avogadro’s constant.

The chemical equation of magnesium and HCl is:

Mg (s) + 2HCl (aq) →  MgCl₂ (aq)  +  H₂(g)

The volume of the MgCl₂ solution, V = 400 ml = 0.4 L

The concentration of MgCl₂ = 1.5 M

The number of moles of MgCl₂ = 1.5 × 0.4 = 0.6 moles

One mole of MgCl₂ is produced from HCl = 2

0.6 moles of MgCl₂ is produced from HCl = 2 × 0.6 = 1.20 moles

Therefore, 1.20 moles of HCl will be reacted to produce 0.6 moles of MgCl₂.

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Answer: D. 434 K

Explanation:

To calculate the final temperature of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]

where,

[tex]V_1\text{ and }T_1[/tex] are the initial volume and temperature of the gas.

[tex]V_2\text{ and }T_2[/tex] are the final volume and temperature of the gas.

We are given:

[tex]V_1=606ml\\T_1=35^oC=(35+273)K=308K\\V_2=854ml\\T_2=?[/tex]

Putting values in above equation, we get:

[tex]\frac{606}{308}=\frac{854}{T_2}\\\\T_2=434K[/tex]

Thus  temperature necessary for the  gas to have a volume of 854 ml is 434 K

Answer:

The environment can affect an organisms through natural evolution. Example: Spotted moths camouflage with the bark on trees, but black moths do not. So the black moths are eaten and the spotted moths survive. The white moths then pass on their genes to their offspring, so their offspring will also be spotted. Eventually most moths will be spotted. But when the industrial revolution occured, the bark of the trees changed to a darker colour. Therefore the spotted moths were easily seen by predators and were eaten. But the black moths blended in with the bark so they survived. The black moths then passed on their genes to their offspring so most of the moth population had black wings.

Answer:

when a substance is cool the particles in the substance contracts, but when heated the particles expand and pressure becomes high that way the particles tend to move faster in the container, in other to escape.

Answer:

It is not dependent on the salt solute at all but the solute does have an affect.

Explanation:

in the equation you maybe aware of the I factor which represents the ions present in the solution. a non ionic will always have a I value of 1 a ionic can be 2 like in NaCl. What this means that all non ionic will lower the temperature  depression but ionics will have a greater affect because for example salt breaks into Na and Cl will essentially hae more impurities than glucose which doesnt dissociate and will have a I value of 1

Answer:

a) acidic; [H+] = 10^-2.5 = 3 x 10^-3

b) basic; [H+] = 10^-11.7 = 2 x 10^-12

c) slightly acidic (almost neutral); [H+] = 10^-6.8 = 1.6 x 10^-7

d) acidic; [H+] = 10^-3.31 = 4.9 x 10^-4

Explanation:

pH < 7 is acidic; pH > 7 is basic; pH = 7 is neutral

[H+] = 10^-pH

A is acidic, B is basic, C is slightly acidic, and D is acidic.

What is pH?

pH, quantitative measure of the acidity or basicity of aqueous or other liquid solutions.

a) Acidic; [[tex]H^+[/tex]] = [tex]10^-^2^.^5[/tex] = [tex]3 X 10^-^3[/tex]

b) Basic; [[tex]H^+[/tex]] = [tex]10^-^1^1^.^7[/tex] = [tex]2 X 10^-^1^2[/tex]

c) Slightly acidic (almost neutral); [[tex]H^+[/tex]] = [tex]10^-^6^.^8[/tex]= [tex]1.6 X 10^-^7[/tex]

d) Acidic; [[tex]H^+[/tex]] = [tex]10^-^3^.^3^1[/tex]= [tex]4.9 X 10^-^4[/tex]

pH < 7 is acidic; pH > 7 is basic; pH = 7 is neutral

Hence, a is acidic, b is basic, c is slightly acidic, and d is acidic.

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Answer:

False, i think

Explanation:

Answer:

Egg is heterogeneous.

Ranch Dressing is heterogeneous

Windex is homogeneous.

Answer:

1. By praying in the day or meditating

Being successful in your life will start with deciding to change in order to Learn. To make this happen, you need a good attitude and discipline. If you are already in the place where you are writing, it cannot be said because you probably like other things in your life very much. Make it a habit to start your day by praying or meditating. This will help you feel that you are more than who you think you are, thus showing that you can make it physical than you think you can and be in a different place in life than the one you are facing right now. Connect with yourself, be confident, and understand that you see better.

2.Be fully present when you are with your family

Family life is the area most associated with work-life balance. Having a good family life is like being at the top of your work-life balance. After all, your family will always be with you in your good and bad days. Friendships may end, but family relationships last. Start making changes in your life by making it in your family life. Make it a habit to spend quality time with them. Be more involved in their life, physically and spiritually.

3.Thank you to people you already know

Good connections are essential in business. It causes you to do more and better work. Good and strong connections in your personal life, on the other hand, allow you to develop yourself in different areas of life. This is another way to achieve balance. Developing your environment and making strong connections helps you learn from other people, broaden your perspective, and even broaden your vision of life. Communicate with the least person you know every day. It's always easier for you to start expanding your network with people you know. Tell him what you are busy with, ask him what he is busy with and if he needs help. Asking for help for yourself will also build trust. And it's okay to ask him if he knows other people who can help you

4.Do something creative

Although the left brain right brain dominance theory has been debunked, the world still cares more about activities attributed to the left brain, such as logic and measurement. Most businesses prefer analytical to creative thinking. And many people decide that creative thinking is impractical and discard it. Whatever your job is, you shouldn't give up your creative qualities. As an employee or employer, you have to be creative for more customers, more work and more marketing. Notice how your blood is pumping and how your adrenaline rises. Only right brain activities and creativity affect your lives. More importantly, the way to improve your vision and create new opportunities for your business and social life is through creativity. If your artist side is dominant, you should devote more time to activities such as painting, music, animation, and literature; maybe even consider starting a blog for yourself. This will help you to balance and add color to your life after a long and monotonous 'left-brain' weighted day.

5.30-minute walks

The first five items consisted of things you need to focus on every day for your emotional, relational, and personal success. But in order to develop and enjoy this success, you must also improve your Physical health. Make it a habit to move. Walk for half an hour a day, go to the gym, or even stretch your body every hour you sit down. Physical activities have many alternatives and benefits. Choose the most convenient and tasteful for you.

Explanation:İYİ GÜNLER

Answer:

flourine

Explanation:

im not sure the answer

answer:

the student who answers the riddle will get the prize

explanation:

Answer:

8.02

Explanation:

Answer:

I think its false hope I helped pliz mark brainlist

Answer:

I am so sorry I do not know this

Explanation:

Answer:

2x - 9y = 23

5x - 3y = -12x - 9y = 23

5x - 3y = -1

Explanation:

Answer:

Explained below.

Explanation:

Formula when magnesium reacts with hydrochloric acid is given by;

Mg(s) + 2HCl(aq) = MgCl2(aq) + H2(g)

So, from the equation, we can see that the gas formed is hydrogen.

This hydrogen gas is collected by a method known as water displacement.

This gas can be tested for by holding a burning splint near to the top of the test container. The resulting effect should be a high pitched pop sound because the hydrogen gas will react with the oxygen gas in the air to result in a small explosion.

Answer:

[tex]\boxed {\boxed {\sf d= 25 \ g/mL}}[/tex]

Explanation:

Density is equal to mass over volume.

[tex]\rho=\frac{m}{v}[/tex]

This is the formula used.

The mass is 50 grams and the volume is 2 milliliters.

[tex]m= 50 \ g \\v= 2 \ mL[/tex]

Substitute the values into the formula.

[tex]\rho =\frac{50 \ g }{2 \ mL}[/tex]

Divide.

[tex]\rho= 25 \ g/mL[/tex]

The formula used is ρ=m/v and density is 25 grams per milliliter.

sugar would be a dependent factor

Answer:

Stannic nitride, Sn3N4

Explanation:

Answer:

14.3 Litres

Explanation:

Standard temperature and pressure denotes that a gas has the following:

P = 1 atm

T = 273K

According to this question, the mass of CO2 is 28g.

Using mole = mass/molar mass

Molar mass of CO2 = 12 + 16(2)

= 12 + 32

= 44g/mol

Mole = 28/44

= 0.64mol

To calculate the volume of CO2 at STP, we use the general gas law equation as follows:

PV = nRT

R = Gas law constant = 0.0821 Latm/molK

V = nRT/P

V = 0.64 × 0.0821 × 273/ 1

V = 14.3/1

V = 14.3 Litres

Answer:

its chlorine

Explanation:

beacuse 3+ is a positive ion so we have 20 electrons - 3 electrons=17elecrons

an element with 17 electrons is cl

Answer:

Electrons, with a charge of -1.

Explanation:

The nucleus of the atom is composed of protons and neutrons.

The nucleus is where the bulk of the mass of an atom is found.

Electrons orbit the nucleus in various energy levels.

Protons have a charge of +1, neutrons have no charge, and electrons have a charge of -1.

Answer:

I think it's 1

Explanation:

As the balloon rises the gas inside the balloon expands because the pressure surounding the balloon drops.