True or false. (Pls help)

Answer:

Mass = 154.67 g

Explanation:

Given data:

Mass of aluminum chloride produced = ?

Mass of chlorine = 123.2 g

Solution:

Chemical equation:

2Al + 3Cl₂  →   2AlCl₃

Number of moles of chlorine:

Number of moles = mass/molar mass

Number of moles = 123.2 g/ 71 g/mol

Number of moles =1.74 mol

Now we will compare the moles of aluminum chloride and chlorine.

                          Cl₂              :              AlCl₃

                            3               :                 2

                           1.74            :          2/3×1.74 = 1.16 mol

Mass of AlCl₃:

Mass = number of moles × molar mass

Mass =  1.16 mol × 133.34 g/mol

Mass = 154.67 g

90 grams. When the state of an object changes, the mass doesn’t change.

*edited*

Answer:

0.303kg/m

Explanation:

Density=m/v where m is mass

and v is volume

we then convert m in grams to kg

= 34.16/1000

=0.0342kg

converting ml to m

=11.3/100

=0.113m

then density=0.0342/0.113

=0.303kg/m

Answer:

human-F

chicken-D

rabbit-E

tortoise-C

salamander-B

fish-A

Explanation:

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Answer:

D Tortoise

B Salamander

A Fish

C Chicken

F Human

E Rabbits

Explanation:

I Really have an Explanation

Phosphine is an example of a polar molecule with non-polar bonds

Answer:

Voltage is the pressure from an electrical circuit's power source that pushes charged electrons (current) through a conducting loop, enabling them to do work such as illuminating a light.

Explanation:

I hope this is right i found it off a website called fluke!

Answer:

Since the gastropod is not unique, it cannot be an index fossil. An index fossil must be found over a wide area of the Earth. Since the gastropod is widely spread, it cannot be an index fossil.

Explanation:

Answer:

down below

Explanation:

NO

H20

P4O10

SO3

1. NO

2. H2O

3. P4O10

4. SO3

Answer:

car is in the driveway

water is flowing in the river

a man is. walking in the road

a bird is flying in the sky

a tiger is running in the jungle

a tiger is running to eat a breakfast

Answer:

4.D. 2KJ

5.B. close to 0 degree celsius

Explanation:

heat absorbed= heat given out

100g * 4.2 * (x-0)= 400g * 4.2* ( 20-x) where x is the new temp reached

then x= 20

i.e. the temperature of ice increases to 5 degree celsius and the temperature of water decreases to 5 degree celsius .

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Answer:Evaporation

Explanation:

The suns heat speeds the movement of water molecules, until the molecules move fast enough that they jolt out the surface of the water individually. Overtime the water gradually evaporates into water vapor.

Answer:

Heat

Explanation:

Heat will always flow from the warmer object to the colder object. The heat transfer will stop when the two objects are at the same temperature and reach thermal equilibrium.

Hope this helps!

Answer:

when both object are the same temperature

Explanation:

Answer: cooling

Explanation:

Answer:

cooling

Explanation:

Answer

involving electrical charges: electrical

involving energy stored in chemical

bonds: thermal

involving the position and motion of

an object: mechanical

involving the motion of atoms: chemical

Explanation:

almost 100 this is right, sorry if this is wrong :)

water into vapor is the answer

Answer:

liquid water turning into vapor

Explanation:

because physical changes alter only the size

Answer:

Sound waves and light waves need to change places.

Explanation:

Given table:

           Mechanical waves                        Electromagnetic waves

          Ocean water                                      Sound waves

          Light waves                                        Radiation waves

          Earthquake waves                             X-ray waves

From the given table, to be correct, light and sound waves must change their position.

Light wave is an electromagnetic wave

Sound wave is a mechanical wave

 An electromagnetic wave does not require a material medium for propagation.

  Mechanical waves require material medium for their propagation.

        Mechanical waves                        Electromagnetic waves

          Ocean water                                     Light waves waves

          Sound waves                                         Radiation waves

          Earthquake waves                                 X-ray waves

Answer:

Sound waves and light waves need to change

Explanation:

Answer:

Its positive charge is attracted to the negative charge of Cl-

Note: The correct question is given below:

Which best describes why NH4+ can form an ionic bond with Cl-?

Its outermost shell gains one or more electrons from Cl-.

Its positive charge is attracted to the negative charge of Cl-.

It has a negative charge that is spread over the entire ion.

It has a nitrogen atom that is strongly attracted to Cl-.

Its positive charge is attracted to the negative charge of Cl-.

Explanation:

An ammonium ion is a positively charged ion which is composed of a molecule of ammonia and a hydrogen ion which are in a coordinate covalent bond due to the lone pair of electrons of the nitrogen atom in the molecule ammonia. The chloride ion however, has an extra electron which gives it a negative charge.

An ionic bond is formed between two oppositely charged ions by a transfer of electrons from one atom to another. It usually occurs between non-metals and metals. However, that formed between ammonium ion and chloride ion is between non-metals entirely.

Due to electrostatic attraction between the oppositely charged ions, an ionic bond is formed between ammonium ion, NH4+, and chloride ion, Cl-.

Answer:

Explanation:

For 4 all you have to do is take the -log(H3O+) and then use your PH values to identify if it's acidic or basic

a. 2.06 - acidic

b. 8.4 - basic

c. 6.67 - acidic

d. 5.85 - acidic

Answer:

Kinetic energy

Explanation:

Answer:

7.6125

Explanation:

multiply 7.5 with 1015

yll got 76125 divide it by 1000 to get answer in grams

The mass in grams of 7.5 × 10¹⁵ molecules of ammonia is 21.08 × 10⁻⁸ g.

Mass of any substance from moles will be calculatd as:

n = W/M , where

W = required mass

M = molar mass

We know that in 1 mole of any substance 6.022 × 10²³ particles of that sybstance are present.

No. of moles in 7.5 × 10¹⁵ = 7.5 × 10¹⁵molecules / 6.022 × 10²³ molecules per mole

No. of moles in 7.5 × 10¹⁵ = 1.24 × 10⁻⁸ moles

Molar mass of ammonia = 17 g/mol

Now we put the requred values on the first equation to get the mass as:

W = (1.24 × 10⁻⁸mol)(17 g/mol)

W = 21.08 × 10⁻⁸ g

Hence required mass of ammonia is 21.08 × 10⁻⁸ g.

To know more about moles, visit the below link:

https://brainly.com/question/24639749

Answer:

The number "1.25" is already at a number that shouldn't be determined using scientific notation. Do you want 1.25ml----> liters ? If so, here

Explanation:

1.25 × [tex]10^{-3}[/tex]

is the amount of liters

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Answer:

mabey c or d

Explanation:

color, odor, density, melting temperature, boiling temperature, and solubility are examples of physical properties. Physical properties can be used to identify a pure substance.

Answer:

B. Molecules of different types of atoms that are not attracted to each other.

Explanation:

On a broad basis, matter can be subdivided into pure or distinct substances and impure substances (mixtures);

Pure substances are distinct substances having the following properties:

From this criteria, we see that the second choice is nullified. This is because pure substances have their molecules attracted to each other.

Answer:

Topping the list of concerns is hydrogen burns. In the presence of an oxidizer -- oxygen is a good one -- hydrogen can catch fire, sometimes explosively, and it burns more easily than gasoline does.

Answer:

hydrogen burns

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Hello there :) here are the answers and hope you a GREAT Thanksgiving :)

0.043 grams

Answer:

Don not sure if you got my last email I sent you a text but different question