Are these correct?? Help please

Answer:

The answer is 24 in total

Explanation:

This is a 2:1 ratio. The formula of it is C6 H12 O6

Mass of iron chloride (FeCl₂) : 22.68 g

Proust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements

In the same compound, although from different sources and formed by different processes, it will still have the same composition/comparison

With this law, we can calculate how many grams an element is needed to make a compound with a certain mass, as desired

[tex]\tt mass~Fe=\dfrac{Ar~Fe}{MW~FeCl_2}\times mass~FeCl_2[/tex]

The iron ions in 50 g mixture :

[tex]\tt 20\%\times 50~g=10~g[/tex]

[tex]\tt 10=\dfrac{56}{127}\times mass~FeCl_2\\\\mass~FeCl_2=22.68~g[/tex]

Answer: Yes it's correct.

Explanation: i hoped that helped!!

Answer:

yes this is correctly done

Hi, you've asked an incomplete question. However, I assumed you are referring to the article found on the Scientific American website.

Explanation:

Remember, according to that article we are told that scientists notice that these insects have a long nymphal (immature form before becoming adults) stage, one that can last up to 13 to 17 years on the ground before they leave the ground looking for mating partners.

Because it is only after mating occurs at this point that their eggs are laid, that is why scientists believe that cicadas only reproduce every 13 or 17 years.

Answer:

the partial of colloidal are smaller and they are not heavy whereas the partial of suspension are larger but they are heavy and less movement thus they settle down due to gravity

I think it's Heat and pressure

Answer:

heat and pressure did on edge

Explanation:

Answer:

Explanation:

10^-2

Answer:

Low Tides

Explanation:

Took the test

100%

Answer:

No and yes

Explanation:

Xenon is a noble gas and beryllium is a metal

Answer: no and yes i also agree

Xenon is a noble gas and Beryllium a metal

Explanation:

Answer:

7x+5

Explanation:

4x+15-3x+10

-10 -10

--------------------

4x+5-3x

+3x. +3x

---------------------

7x+5

Answer: The mole ratio of [tex]PCl_3[/tex] to [tex]PCl_5[/tex] is 1: 1

Explanation:

According to the balanced chemical equation ,the number of atoms of each element has to be same on reactant and product side. The stoichiometric coefficients of the species represent their number of moles.

[tex]PCl_3+Cl_2\rightarrow PCl_5[/tex]

Thus in the reactants, there is 1 mole of [tex]PCl_3[/tex] and 1 mole of [tex]Cl_2[/tex] molecule. And thus there is 1 mole of [tex]PCl_5[/tex] in the product as well.

Thus the mole ratio of [tex]PCl_3[/tex] to [tex]PCl_5[/tex] is 1: 1

Answer:

The pressure increases

Explanation:

In this action it is best to apply Boyle's law to resolve the problem. This is an interplay between Volume, Pressure and Temperature.

Answer:

J. Their momentum is conserved

Explanation:

According to the diagram, the best statement that describes what happens when two astronauts collides in space is that their momentum is conserved.

The momentum before collision is 320kgkm/hr and after collision it is 320kgm/s

 This collision is an inelastic collision;

    momentum before  = momentum after

              m₁v₁ + m₂v₂     =       v(m₁ + m₂)

m₁ = 80kg

v₁  = 4km/hr

m₂ = 80kg

v₂  = 0

v  = 2km/hr

 Insert the parameters;

              (80 x 4) + (80 x 0)    = 2(80 + 80)

                    320                      = 320

Answer:

I think its false

Explanation:

Any energy is important

Hope this helps <3

Answer:

In any study of energy, energy conversion is not important.  Heat energy that is lost cannot usually be used to produce work.

Explanation:

Hope this helps!

If so, please mark BRAINLIST!!

thx

Answer:

The arm that was not sprayed with anything

Explanation:

The control group would be the arm that was not sprayed with anything.

The control group during an experiment is a group that forms the baseline for comparison in other to determine the effects of a treatment. The control group does not include the variable that is being tested and as such, it provides the benchmark to measure the effects of the tested variable on the other group - the experimental group. In this case, the experimental group would be the arm that was sprayed with the repellent.

[tex]\huge\boxed{Option C}[/tex]

Calorimeter is device used for the measurement of heat. In a calorimeter we can use the temperature change of water to quantify an amount of heat.  A calorimeter just captures all the energy released (or absorbed) by a reaction in the water. So Option A and B are wrong as calorimeter don't have anything to do with providing the heat or letting the the heat in, as it is the insulated calorimeter too.

In the formation of any bond there is equal amount of heat required as to break that bond. It means Energy released in the making of bond is equal to the energy required in the breaking of the bond. So Option D is wrong as it says we need more energy in making then breaking.

Enthalpy is the total heat content of the system. As we provide energy to the reactants and the product is formed, so The enthalpy(heat content) of product is more than the Enthalpy of the reactant, Thus Option C is correct.

Enthalpy is denoted by H or Q, its formula is,

                                       H = U + PV

Where,

           U is internal energy

           PV is equals to Work done ; P = Pressure, V = Volume

Answer:

I don't know the answer you can search it on Google you will get it and don't forget to follow me and mark me as brainlest please I will follow u back really if u follow me back

Answer:

It is chemical Change

Explanation:

Because you are changing the substance.

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

Answer:

Kinetic energy

Explanation:

Answer:

The radius of an atom can only be found by measuring the distance between the nuclei of two touching atoms and then halving that distance. Measuring the atomic radii of chemical elements is a complicated task as the size of an atom is of the order of 1.2×10-10 m. The electron cloud forming the shell of an atom does not have any fixed shape which makes it difficult to determine the atomic size of an atom. So we can say that practically we cannot determine the size of an individual atom.

Atomic Radius:

Atomic radius is the distance from the center of the nucleus to the outermost shell containing electrons.

Explanation:

Answer:

Thecinically it is both because and  an un opened bottle of soda is homogeneous and an opened bottle of soda is herterogeneous. I hope this helps please reward branlist.

Answer:

D.

Explanation:

Because i just copied the person above tbh, and i also got it right in the quiz

To solve such this we must know the concept of redox reaction. Therefore, the correct option is option D that is an oxidation and reduction reaction.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

Redox reaction is a chemical reaction where oxidation and reduction takes place simultaneously. Oxidation is loss of electrons and reduction is gain of electrons. The electron transfer from oxidant to reductant.

Therefore, the correct option is option D that is an oxidation and reduction reaction.

Learn more about the chemical reactions, here:

https://brainly.com/question/3461108

#SPJ2

Answer:

see attachment......

Answer:

Ionization

Melting

Vaporization

Explanation:

▶Ioniztion changes the charge of an electron,  this usually happens between a chemical reaction. It takes a small amount of energy. Most of the time energy is absorbed instead of expelled!

▶ Melting changes the shape of the item and takes about 334 Joules/gram of energy.

▶ Vaporization changes the state of matter that the item is in and  requires 2260 Joules/gram.

Brainliest is much appreciated! Hope I helped!

Answer:

See explanation

Explanation:

The question is incomplete but i will try to answer it to the best of my ability.

An element of configuration  2.8.6 is in group 16. This element will form a divalent anion Z^2-

Z is a nonmetal which combines with metals to form ionic bonds. Z can also react with other non metals to form covalent compounds.

Z is expected to have high electronegativity and electron affinity since it is a nonmetal of group 16.

The oxides of Z will dissolve in water to yield acidic solutions.

The molarity of a hydrochloric acid solution : 0.32 M

Titration is a procedure for determining the concentration of a solution by reacting with another solution which is known to be concentrated (usually a standard solution).

Titrations can be distinguished including acid-base titration, depositional titration, and redox titration. An acid-base titration is the principle of neutralization of acids and bases is used.  

Acid-base titration formula  

Ma. Va. na = Mb. Vb. nb  

Ma, Mb = acid base concentration  

Va, Vb = acid base volume  

na, nb = acid base valence  

1 ⇒HCl (valence=1, HCl ⇒H⁺+Cl⁻, one H⁺)

2⇒Ca(OH)₂(valence=2, Ca(OH)₂⇒Ca²⁺+2OH⁻, two OH⁻)

M₂=0.1 M

V₂=48 ml=0.048 L

V₁=30 ml=0.03 L

[tex]\tt M_1.V_1.n_1=M_2.V_2.n_2\\\\M_1\times 0.03\times 1=0.1\times 0.048\times 2\\\\M_1=0.32[/tex]

Answer:

T(K) = 373.15 K

Explanation:

The kelvin is the base unit of temperature in the International System of Units (SI). The symbol used to express temperature in kelvins is K.

The temperature of zero kelvins is called the absolute zero. It is considered to be the lowest possible temperature, although nothing has reached it. The absolute zero (0K) is - 273.15 degrees Celsius.

This is the equation we can use to solve this question:

 [tex]T(K) = T(C) + 273.15[/tex]

We have 100*C.

[tex]T(C) = 100 C[/tex]

[tex]T(K) = 100C + 273.15[/tex]

[tex]T(K) = 373.15 K[/tex]