Four substances are tested for different properties. The results of the tests are in the table below.

Substance
Combustible
Reactivity
Solubility in water
Solubility in ether
Boiling point (ºC)
W
Yes
Yes
Soluble
Insoluble
883
X
Yes
No
Insoluble
Insoluble
2,750
Y
Yes
No
Insoluble
Soluble
196
Z
No
Yes
Soluble
Soluble
98

Which substance is most likely an alkane?
W
X
Y
Z

Answer:

It's funny cause i'm doing the same exact thing as you.

Explanation:

You need to go to the Gizmo, and it explains everything. But When you're looking at "Valence Electrons" thats how many "dots" (electrons) there are on the outermost circle, so Fluorine has 7 Valence Electrons.   To find the valency, you need to first identify the Valence Electrons. Fluorine has 7 valence electrons, and it would be a lot easier for this atom to gain an electron, rather than lose 7. So 8-7 is 1, meaning the Valency of Fluorine will be 1. For the sum, just add the total number, so 7+1 is 8, so the sum of Fluorine will be 8. This is confusing, so I'm sorry if this doesn't make sense.

Answer:

Explanation:

not sure if this is totally correct but checked with classmates and this seems to be around what most got

Answer: 600K and 50kPa

Explanation:

600k as well as 50kPa since the pressure seems to be the lowest as well as the temperature is the greatest throughout this situation.

Under high temperatures and low pressures, actual gases behaved like ideal gases. such as the rule

Even though at high temperatures, the kinetic energy of such gas particles surpasses the intermolecular attractive forces, — in other words this same potential energy of something like the molecules (gaseous).

Thus the above answer i.e., "option 4" is right.

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The Calcium atom has 2 valence electrons but a Calcium ion will have no electrons because it is a cation ion. Meaning that there are more protons than electrons. Also, the normal calcium symbol is Ca but the calcium ion is Ca²⁺

I hope this wasn't too late

Answer:

Low Tides

Explanation:

Took the test

100%

Answer: Yes it's correct.

Explanation: i hoped that helped!!

Answer:

yes this is correctly done

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:

200

Explanation:

Explanation:

take your weight times by the amount of newtons in a pound, which is 4.45

then convert newtons into grams.

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:

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.

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:

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]

[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

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:

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

Answer:

7x+5

Explanation:

4x+15-3x+10

-10 -10

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

4x+5-3x

+3x. +3x

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

7x+5

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

I think it's Heat and pressure

Answer:

heat and pressure did on edge

Explanation:

Answer:

see attachment......

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.

Answer:

first u have to like draw like a number line uk how dey do in math but instead of num u add wht eva da question askin u

Explanation:

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

The periodic table, arranges the chemical elements ascording to their recurring properties. The number of each element corresponds to the number of protons in its nucleus.

There are 8 groups and 7 periods in the periodic table.

_________________________________________________________

Each element within a group has similar physical or chemical properties because of its atom's outermost electron shell. The outermost shell of every element in a specific group has same number of valence shell (most chemical properties are determined by the the outermost valence shell electron). The group number of an element represents the number of electrons in its outermost orbit. This shows that elements arranged in the same group have the same number of electrons in their outermost orbit.

Sodium and Potassium belong to the same group i.e. GROUP 1 which is also called S BLOCK Group or IONIC GROUP. They have the similar properties,

__________________________________________________________

Properties of S block Elements

1- They are soft metals

2- possess low melting and boiling points

3- They have the largest atomic radii in their corresponding periods

4- are good conductors of heat and electricity.

5- They have low values of ionization energies and are hence highly        electropositive.

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:

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#SPJ2

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 limiting reagent is the reactant that is completely used up in a reaction, and thus determines when the reaction stops. ... The limiting reagent is the one that is totally consumed; it limits the reaction from continuing because there is none left to react with the in-excess reactant.

Explanation:

The limiting reagent is the reactant that is completely used up in a reaction, and thus determines when the reaction stops. ... The limiting reagent is the one that is totally consumed; it limits the reaction from continuing because there is none left to react with the in-excess reactant.

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:

sdfs

Explanation:

dfsdfsdfs

Answer:

こんにちは

Explanation:

Answer:

some of the energy is lost entirely

Explanation:

Answer:

Explanation:

iron