Pl help it’s for a grade

Answer:

5/4 I think this is my first anser

Answer:

2NH3 --> 3H2 + N2

Explanation:

It's hard to explain how I got these coefficients  but I recommend watching Tyler DeWitt on Youttube. He explains tons of chemistry concepts in an easy and clear way. I always watch his videos when I don't understand something.

I would type in "How to balance chemical equation" by Tyler DeWitt

Here you go I hope this helps

Answer:

Since the temperature of the water made the air hot, i believe that after the video if the experiment continued it would have just made the air a little warmer but not too hot.

Explanation:

Answer:

Periodic table of elements

Explanation:

Answer:

the answer is D

Explanation:

because I had a test that had this question and I got it correct

Answer:

A balanced chemical equation not only describes some of the chemical properties of substances—by showing us what substances react with what other substances to make what products—but also shows numerical relationships between the reactants and the products.

Answer: 4.0 moles of sodium will react with water to produce 2.0 mol of hydrogen

Explanation:

The balanced chemical equation is:

[tex]2Na(s)+2H_2O(l)\rightarrow 2NaOH(aq)+H_2(g)[/tex]  

According to stoichiometry :

1 mole of [tex]H_2[/tex] is produced by = 2 moles of [tex]Na[/tex]

Thus 2.0 moles of [tex]H_2[/tex] are produced by =[tex]\frac{2}{1}\times 2.0=4.0moles[/tex]  of [tex]Na[/tex]

Thus 4.0 moles of sodium will react with water to produce 2.0 mol of hydrogen

this is ur answer

plzzz mark me as brainliest

Answer:

A) Charging by contact

Explanation:

Transfer of heat by direct contact, Heat energy is conducted from the hotter medium to the cooler medium

Answer: A

Explanation:

Answer:

J. J. Thomson

Explanation:

This is called the plum pudding model which was proposed by J. J. Thomson.

Answer:

C the answer is c

Explanation:

ITS C

Answer:

E) All of these descriptions are true

Answer:

See Explanations

Explanation:

The Empirical Gas Laws include ...

Boyles Law => P₁V₁ = P₂V₂

Charles Law => T₁/V₁ = T₂/V₂

Gay-Lussac's Law => P₁/T₁= P₂/T₂

Avogadro's Law => V₁/n₁ = V₂/n₂

Combined Gas Law => P₁V₁/T₁ = P₂V₂/T₂

Ideal Gas Law => PV = nRT; R = 0.08206 L·Atm/mol·K

One only needs to learn the 'Combined Gas Law' in that it embodies all of the gas law problems.

Start with a simple table for P, V & T and enter given data. If a variable is not given, assume it is constant. Set up P₁V₁/n₁T₁ = P₂V₂/n₂T₂ and substitute given data. Solve for unknown.

Your Problems:

1. P₁ = 1 Atm        P₂ = 3 Atm

  V₁ = 300ml      V₂ = ?

  T₁ = Constant  T₂ = T₁

   n₁ = Constant  n₂ = n₁

P₁V₁/n₁T₁ = P₂V₂/n₂T₂  

=> (1Atm)(300ml)/(Constant)(Constant) = (3Atm)(V₂)/(Constant)(Constant)

=> (1Atm)(300ml) = (3Atm)V₂

=> V₂ = (1Atm)(300ml)/(3Atm) = 100ml

2. P₁ = 1 Atm        P₂ = ?

   V₁ = Constant  V₂ = V₁

   T₁ = 273K         T₂ = 82K

   n₁ = Constant  n₂ = n₁

P₁V₁/n₁T₁ = P₂V₂/n₂T₂

=> (1Atm)(Constant)/(273K)(Constant) = (P₂)(Constant)/(82K)(Constant)

=> (1Atm)/(273K) = (P₂)/(82K)

=> P₂ = (1Atm)(82K)/(273K)

=> P₂ = 0.3 Atm (1 sig-fig)

3. P₁ = 101.25kPa     P₂ = 506kPa

   V₁ = 5 Liters         V₂ = ?

   T₁ = Constant       T₂ = T₁

   n₁ = Constant  n₂ = n₁

P₁V₁/n₁T₁ = P₂V₂/n₂T₂

=> (101.25kPa)(5L)/(Constant)(Constant) = (506kPa)(V₂)/(Constant)(Constant)

=> (101.25kPa)(5L) =  (506kPa)(V₂)

=> V₂ = (101.25kPa)(5L)/(506kPa)

=> V₂ = 1.00 Liter

4. P₁ = Constant       P₂ = P₁

   V₁ = 3.2 Liters      V₂ = ?

   T₁ = 273°C + 273 = 546K       T₂ = 400°C + 273 =673K*

   n₁ = Constant  n₂ = n₁

*Note => be sure to convert all temps to Kelvin when working empirical gas law problems. K = °C + 273

P₁V₁/n₁T₁ = P₂V₂/n₂T₂

=> (Constant)(3.2L)/(Constant)(546K) = (Constant)(V₂)/(Constant)(673K)

=> (3.2L)/(546K) = (V₂)/(673K)

=> V₂ = (3.2L)(673K)/(546K)

=> V₂ = 3.944 Liters ≅ 3.9 Liters (2 sig-figs)

Answer:

B

Explanation:

it transports water from roots to the leafs

Answer:

Li

Explanation:

F is a strongest electronegative element and it will combine with an element with low electronegativity. From the list provided, the element is Li.

Answer:

Very!

Explanation:

Very phat!

Explanation:

chemical analysis of a compound shows that it contains 0.99g lead ,0.154g sulfur and 0.306g oxygen. what is the empirical formula of the compound.

Chemical analysis of a compound shows that it contains 0.99g lead ,0.154g sulfur and 0.306g oxygen. what is the empirical formula of the compound.

This can be solved by using one of the different gas laws. This is shown below:

PV / T

Given:

P1 = 0.98 atm

V1 = 212 cm^3

T1 = 293 K

P2 = ?

V2 = 196 cm^3

T2 = 308K

Substituting to the relation:

P1V1/T1 = P2V2/T2

(0.98 * 212)/293 = (P2 * 196)/308

P2 = 1.114 atm

For this we use general equation for gases. Our variables represent:

p- pressure

v-volume

t- temperature

P1V1/T1 = P2V2/T2

in this equation we know:

P1,V1 and T1, T2 and V2.

We have one equation and 1 unknown variable.

P2 = T2P1V1/T1V2 = 1.1atm

We know that when two lines cross each other forming four angles, such that, each pair of opposite angles are equal to each other. This pair of angles are known as Vertical opposite angles.

Similarly, ∠KML = ∠JML = 25°.

Therefore, Chemical analysis of a compound shows that it contains 0.99g lead ,0.154g sulfur and 0.306g oxygen. what is the empirical formula of the compound.

Learn more about oxygen on:

https://brainly.com/question/13370320

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Answer:

True

Explanation:

Answer:

N20

Explanation:

Answer:

100°C And will be same. Your best bet is to calculate your answer. Explanation:

Answer:

See Explanation

Explanation:

                     8Fe        +        S₈                =>        8FeS

Given:            10g                  10g

moles      10g/56g/mol     10g/256g/mol

                = 0.179mol Fe   = 0.039mol S₈

Reduce => divide mole values by respective coefficients; smaller value is Limiting Reactant.

                 0.179/8 = 0.022      0.039/1 = 0.039  

       => Fe is limiting reactant

                       8Fe        +               S₈                   =>         8FeS    

Given:     10g/56g/mol          10g/256g/mol

               = 0.179mol              = 0.039 mol                  0.179mol FeS produced

                                          1/8(0.179)mol S₈ used        (coefficients are equal,

                                          = 0.022 mol S₈ used       => moles Fe = moles FeS)

                                         = (0.039 - 0.022)mol S₈     = 0.179mol FeS

                                         remains in excess              =(0.179mol)(88g/mol)

                                         = 0.0166 mol S₈ (excess)  = 15.8 g FeS  

                                         = (0.0166mol)(256g/mol)           (Theoretical Yield)

                                         = 4.26g S₈ in excess

Answer:

I cant really see the individual problems very well but i hope this helps

Explanation:

Decomposition = one thing -> 2 or more things

Synthesis= 2 or more things -> 1 thing

Answer:

62.15 m (squared)

Explanation:

We know that the Area of the square is 5.5 x 4= 22

so 90 degree to 30 degree is divide by 3

so u divide 22 by 3 and get 7.3 wich is the semi circle thing

now 7.3 x 5.5 = 40.15

22 + 40.15 = 62.15 m (squared)

Look im not really sure but I think this is the answer

Please mark as brainliest

Have a great day, be safe and healthy

Thank u  

XD

Answer:

1. The area of the rectangle is 22 but I'm not sure the area of the shape above sorry.

A. 28 m

B. 672 m

Explanation:

A. 6 + 6 + 8 + 8 = 28 or 2(6+8) = (2)14 = 28

B. 28 * 24 = 672

Answer: pizza crust, Vegetables, Dairy, Meat, and Dairy

Explanation:

The pizza crust is important, not only to deliver those mouthwatering toppings to your anxiously waiting taste buds, but to provide vital nutrients from grains. Vegetables are a common and delicious topping for pizza. These toppings provide an array of nutrients and including multiple servings of vegetables in your diet every day is a necessary part of a healthy lifestyle. If you get meat on your pizza, it is an excellent source of protein. All meat is high in protein and iron, which are necessary to build muscle. Cheese is a good source of the calcium we all need for strong bones and teeth. Cheese is also a good source of protein.

A bread crust contains carbohydrate, vegetables contains vitamins, cheese contain calcium and protein, meat contain protein.

Nutrients are the substance that makes a body healthy.

Food material contain different nutrients that help in growth of the body.

In pizza, we get all type of nutrients

A bread crust contains carbohydrate which provide energy.

Vegetable contains vitamins to keep the body parts healthy.

Cheese contain calcium and protein which maintain the growth and repairing of the body.

Meat contain protein, good for muscles.

Thus, A bread crust contains carbohydrate, vegetables contains vitamins, cheese contain calcium and protein, meat contain protein.

Learn more about nutrient, here:

https://brainly.com/question/1268939

Explanation:

When mixed together, baking soda and vinegar undergo a chemical reaction. Carbon dioxide, water, and sodium acetate are formed during the reaction.

Answer:

It’s baking soda and vinegar

And the products in the reaction are carbon dioxide, water, and sodium acetate

Explanation:

Trust

Answer:

Hey mate....

Explanation:

This is ur answer.....

Equation : Cellular Respiration: C6H12O6 + 6O2 → 6CO2 + 6H2O.

Hope it helps u,

Mark me as the brainliest....

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Answer:

C6H12O6 + 6O2 → 6CO2 + 6H2O.

Explanation: