HELPPPPPPPPPP/AYUDAAAAAA

Answer:

Louis braille was a french educator and inventor of a sytem of reading and writing for use use by the blind or visually impaired . his system remains virtually unchanged to this day and is know worldwide simply as braille

Answer:

have different properties from the elements they are made from

Explanation:

Compounds have different properties from the elements they are made from. Compounds are substances composed of two or more kinds of atoms/elements joined together in a definite grouping.

Answer:

Que?

Explanation:

Answer:

A. catalyst.

Explanation:

Catalyst is something that causes things to decay. I think catalyst is the right answer from what i know from Miraculous Ladybug... Did you know the show was originally going to be an anime?

Answer:

measured

Explanation:

no way can they pin point exactly when something lived when its in the millions

Answer:

UMMMMMMMMMMM

Explanation:

Answer:

3729

Explanation:

Answer:

Cyclopropane has a planar carbon back bone while propane does not

Explanation:

We have to recognize that in straight chain saturated organic compounds, carbon atoms have a tetrahedral geometry. Each carbon atom is bonded to four other atoms.

However, carbon atoms in cyclic compounds are also sp3 hybridized with each carbon bonded to only four other atoms but the ring system is highly strained.

Cyclopropane is a necessarily planar molecule with a bond angle that is far less than the expected tetrahedral bond angle due to strain in the molecule. Hence, the carbon atoms may have have a "planar backbone".

The mole fraction of the other gases : 0.52

Given

P tot = 2.5 atm

P x = 1.2 atm, n = 0.85 moles

Required

mole fraction

Solution

P tot = P gas X + P other gases

mol fraction = mol x : mol total

P gas X = mol fraction gas X x P total

1.2 atm = mol fraction gas X x 2.5 atm

mol fraction gas X = 0.48

mol fractionof the other gases = 1 - 0.48 = 0.52

Or we can use

P other gases = 2.5 - 1.2 = 1.3 atm

mol fraction the other gases = 1.3 : 2.5 = 0.52

Answer: Body plans change as new challenges arise.

Explanation:

The mollusks are the invertebrate animals. They live marine environment. They live in shallow waters. They have been found in variety of marine habitats so this indicates their adaptiveness to different conditions. They have body plan that comprises of shell, mantle, radula and muscular foot that helps in survival and adaptation in different conditions. The shell and mantle are hard structures which protect these animals from predators and also help them to camouflage. Also the muscular foot helps in locomotion. Radula helps in feeding. Oysters, snails are some examples of mollusks.

Answer:

2.66 g of Fe, can be obtained from the reaction

Explanation:

Let's think the reaction:

2Fe₂O₃   +  6CO  →   4Fe +  6CO₂

Ratio is 2:4, so If i have x moles of iron (III) oxide, I will produce the double of moles of Fe.

Mass / Molar mass = Mol

3.80 g / 159.7 g/m = 0.0237 moles

0.0237 moles . 2 = 0.0475 moles

Molar mass Fe = 55.85 g/m

Mol . Molar mass = Mass → 0.0475 m . 55.85 g/m = 2.66 grams

Explanation:

The mole fraction of cation (Al)=0.4

Given

1 M of Aluminium sulphate​

Required

The mole fraction of cation

Solution

Ionization of the Aluminum sulfate solution( assume 1 L solution ) :

mol Al₂(SO₄)₃ = M x V = 1 M x 1 L = 1 mol

Al₂(SO₄)₃⇒2Al³⁺ + 3SO₄²⁻

1 mol          2 mol   3 mol

From this equation, total mol in solution = 2+3 = 5 moles

Mol fraction Al(as a cation) :

= 2/5=0.4

Answer:

E

Explanation:

Anything going down Column 1 is going to be more reactive than anything else.

So the only contenders that are in column 1  are Li and Cs. The most reactive ones are the ones going down.

Cs is at the bottom of column 1. The answer is E

Answer:

KBr

Explanation:

A metal has a very high melting point. Aluminum is a metal.

Ionic solids do not conduct electricity in the solid state. However, when the solids are melted, they conduct electricity.

KBr is an ionic substance, it can only conduct electricity in molten form because the ions are locked up in the solid.

Explanation:

First determine the weight of the density bottle(A1) when it's empty.

Then fill it with the liquid you want to determine the density.

Then determine the weight of the bottle with the liquid(A2).

Then the weight of the liquid is equal to (A2 - A1)

You already know the volume of the bottle.

Apply them to density = weight/volume

Make sure to mention the temperature you measured it because density varies from one temperature to another.

Answer:

wave length=speed*frequency

=36*6

=216 m

Answer:

The manner in which objects will move is determined by the answer to this question. Unbalanced forces will cause objects to change their state of motion

Explanation:

Since these two forces are of equal magnitude and in opposite directions, they balance each other.

Answer:

balance force are those force whose resultant force is zero and unbalanced force are those whose resultant are non zero

Which of the statements about liquids and gases are true?

The particles in liquids and gases can move past one another freely.

Which of the statements about liquids and gases are true?

Both liquids and gases have a definite volume.

The particles in liquids and gases can move past one another freely

Both liquids and gases have a definite shape.

Neither liquids nor gases have a definite shape.

The particles in liquids and gases can move past one another freely.

Answer:

2Al + 6HCl -----> 2AlCl3 + 3H2

Reaction of acid with metals

Cu(OH)2. -----> H2O. + CuO

Dissociation of coper hydroxide / dissociation of base

Explanation:

Answer:

D

D...............DDDDDDD

Answer: D

Explanation:

The answer is D as it is the only correctly balanced equation.

Answer:

436.55841 grams.

Explanation:

The molecular formula for Iron(III) Iodide is FeI3. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Iron(III) Iodide, or 436.55841 grams.

You use the 1 / 436.55841 conversion rate. This is different for each element, according to the stoichiometry tables. Iron(II) oxide would be 2/3 of the 1/436.55841 conversion rate, that is, multiplying the fraction to denominator.

Answer:

3.51m/s

Explanation:

Given parameters:

Distance   = 20miles

         Miles to meters:

             1 mile  = 1609m

              20miles  = 20 x 1609  = 32180m

Time  = 153minutes

             1 min  = 60s

           153min  = 60 x 153  = 9180s

Unknown:

Average speed  = ?

Solution:

To solve this problem;

        Average speed  = [tex]\frac{distance }{time taken}[/tex]  

         Average speed  = [tex]\frac{32180}{9180}[/tex]   = 3.51m/s

Answer:

12.73 L

Explanation:

Given that,

Initial temperature, [tex]T_i=20^{\circ}=20+273=293\ K[/tex]

Initial volume, [tex]V_i=10\ L[/tex]

We need to find the volume on the gas when the tank is heated to 100 degrees celsius or 373 K.

We know that volume is directly proportional to the temperature of the gas. Using above relation,

[tex]\dfrac{V_i}{T_i}=\dfrac{V_f}{T_f}\\\\V_f=\dfrac{V_iT_f}{T_i}[/tex]

Putting all the values,

[tex]V_f=\dfrac{10\times 373}{293}\\\\V_f=12.73\ L[/tex]

So, the final volume of the gas is 12.73 L.

Answer:

63.6g

Explanation:

The reaction expression is given as:

    Fe  + CuCl₂  →   FeCl₂   +   Cu

Given:

Number of moles of Fe  = 1 mole

Unknown:

Mass of copper that would be produced;

Solution:

From the balanced reaction expression:

           1 mole of Fe will produce 1 mole of Cu;

So;

  Mass of Cu produced  = number of moles x molar mass

  Mass of Cu  = 1 mole x 63.6g/mol  = 63.6g

Answer:

is there a picture or something?

Explanation:

Explanation:

Your question is incomplete please update it.

Answer:

See explanation

Explanation:

Given that;

E = hc/λ

h = 6.63 * 10^-34 Js

c = 3 * 10^8 ms-1

λ = ?

E = 3.978 * 10^-19 J

λ = hc/E

λ = 6.63 * 10^-34 * 3 * 10^8 /3.978 * 10^-19

λ = 19.89 * 10^-26/3.978 * 10^-19

λ = 5 * 10^-7 m The colour is green

2. E = hc/λ

E=  6.63 * 10^-34 * 3 * 10^8 /1000 * 10^-9

E = 1.989 * 10^-19 J

But

E = hf

f = E/h

f =  1.989 * 10^-19/6.63 * 10^-34

f = 3 * 10^14 Hz The radiation is infrared

3. E = hc/λ

λ= hc/E

λ= 6.63 * 10^-34 *  3 * 10^8 /2.0 * 10^-14

λ= 995 * 10^-14 m This is gamma radiation

4. E = hc/λ

E=6.63 * 10^-34 *  3 * 10^8 /620 * 10^-9

E = 3.2 * 10^-19 J

5. E = hf

E= 6.63 * 10^-34 * 2 * 10^17

E = 1326 * 10^-19 J

E = hc/λ

λ= hc/E

λ= 6.63 * 10^-34 * 3 * 10^8 /1326 * 10^-19 = 15 * 10^-9

This is ultraviolet radiation

Answer:

Answer 1: The correct answer is b. convergent continental-continental boundary.

A convergent continental-continental boundary refers to a convergent plate boundary where two continental plates meet or come together. When this happens, a forceful collision occurs, and structures like mountains start to form. The Himalaya mountain range is formed as a result of the convergence of the Indian and Eurasian continental plates.

Answer 2: The correct answer is d. convergent oceanic-oceanic boundary.

Volcanic island arcs refers to a curved line of volcanoes formed from the subduction (sinking) of one oceanic plate below another plate. Examples of volcanic island arcs include Japanese Islands and Alaskan Islands

Answer:

i think it would be c

Explanation:

sorry if it is wrong

Answer:

2NaClO₃ -> 2NaCl + 3O₂

Explanation:

The number of atoms in the reactants has to equal the number of atoms in the products.

Hope that helps.

Answer:

During Glycolysis, there is one step where NADH + H+ is formed from NAD+ O F-6-P - F- 1,6-BP O PGAL – 1,3-BPGA O 2-PGA - PEP O 3-PGA → 2-PGA.