CAN SOMEONE THATS GOOD AT CHEM PLEASE HELP ME?!?!

I’LL GIVE 50 POINTS!!!
AND A BRAINIEST!!!

PLEASE I HAVE OTHER HW TO DO:(

Answer:

9. 122.4 yards

10. 45.395 litres

Answer:

sdfs

Explanation:

dfsdfsdfs

Answer:

element is the smallest particles which cannot be broken down.

Answer:

Temperature is a measure of the average kinetic energy of the particles in a substance.

Moles HCl reacted : 0.0135

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

[tex]\large {\boxed {\bold {M ~ = ~ \dfrac {n} {V}}}[/tex]

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

So to find the number of moles can be expressed as

n = V x M

The volume of HCl 30 cm³=3.10⁻² dm³

Molarity of HCl = 0.45 mol/dm³

so moles HCl reacted :

[tex]\tt n=3.10^{-2}\times 0.45=0.0135[/tex]

Answer:

iron (Ar) 3d^6 4s^2 and cobalt (Ar) 3d^7 4s^2

Based on the electron configuration of elements Fe and Co can likely form ions with multiple charges.

Electron configuration of an element describes how electrons are distributed in its atomic orbitals. Electron configurations of atoms follow a standard notation in which all electron-containing atomic subshells (with the number of electrons they hold written in superscript) are placed in a sequence.

Electron configuration can be written according to the following rules-

1. Aufbau Principle

2. Pauli's exclusion principle

3. Hund's rule

Electrons will be filled according to the increasing order of the energy as per the n+l rule.

Given,

a) zinc [Ar] 3d¹⁰4s²

b) iron [Ar] 3d⁶4s²

c) sodium [Ne] 3s¹

d) cobalt [Ar] 3d⁷ 4s²

e) silver [Kr] 4d¹⁰ 5s¹​

Except Co and Fe, all the elements when loose 1 or 2 electrons form full filled electrons, Fe and Co show +2, +3, +4 etc oxidation states.

Therefore, Based on the electron configuration of elements Fe and Co can likely form ions with multiple charges.

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Explanation:

molecular formula

....

Formaldehyde, CH20, and acetic acid, C2H4O2, have the same empirical formula but different molecular formulas. Therefore, option D is correct.

A chemical formula lists the elements that comprise the compound as well as the number of atoms of each element in the compound's smallest unit, whether a molecule or a formula unit. Knowing the elements' names and a few basic rules allows us to name simple compounds given a chemical formula.

Chemical formulas are classified into three types: empirical, molecular, and structural.

Empirical formulas depict the simplest whole-number ratio of atoms in a compound, whereas molecular formulas depict the number of each type of atom in a molecule and structural formulas depict how the atoms in a molecule are bonded to each other.

Thus, Formaldehyde, CH20, and acetic acid, C2H4O2, have the same empirical formula but different molecular formulas, option D is correct.

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Answer:

helium is denser than air

Answer:

For air, which has a molar mass of 29.0 g/mol, this gives a density of 1.18 g/l. Helium, which has a mass of 4.00 g/mol, has a density of 0.164 g/l.

Answer:

c

Explanation:

Sunlight heating the sand on the beach on a hot summer day is an example of radiation which is electromagnetic radiation.

The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.

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Answer:

you did not show the whole page

Explanation:

Answer:

D

Explanation:

Because sub-shell p have maximum no. of electrons I. E. 6

I think it's Heat and pressure

Answer:

heat and pressure did on edge

Explanation:

Answer:630000x

Explanation:

6.3x×100000

Answer:

A cold surface I think.

Explanation:

Answer:

a

Explanation:

Prevailing winds can cause a milder climate with heavy rain is the change that affects the short-term climate in a region, hence option A is correct.

Concentrated areas of winds are known as air currents. They primarily result from variations in the temperature or atmospheric pressure.

The horizontal and vertical currents are present at the mesoscale, whereas horizontal currents predominate at the synoptic scale.

A region's short-term climate can be dramatically impacted by changes in wind currents. As they move moisture from one place to another, prevailing winds can result in a milder climate with heavy rain.

As a result, the impacted area may see higher precipitation and a more temperate environment.

Therefore, prevailing winds can cause a milder climate with heavy rain can impact the short-term climate in a region.

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1. Q=112.8 kJ

2. Q=5.01 kJ

The heat required for phase change :

Q = mLf

Lf=latent heat of fusion

Q = mLv

Lv=latent heat of vaporization

1.

m=50 g=0.05 kg

Lv (water) = 2256 kJ/kg

[tex]\tt Q=0.05\times 2256=112.8~kJ[/tex]

2.

m=15 g=0.015 kg

Lf for water = 334 kj/kg

[tex]\tt Q=0.015\times 334=5.01~kJ[/tex]

Answer:1 alloys 2 main

Explanation: Brass and bronze are both constructed from copper because copper is the main component in brass

Answer:

Initially, the aluminum atom had a charge of +13 + (−13) = 0; in other words, its charge was neutral due to the equal numbers of protons and electrons. When it becomes an ion, it loses 3 electrons, leaving behind only 10. Now the charge is +13 + (−10) = +3.

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Answer:

25 protons, 25 electrons, 30 neutrons. ......... manganese is the identity

Explanation;

x = atomic number -# of protons

The number of neutrons = x + 5

The mass number (sum of protons + neutrons) = 55.

x + (x + 5) = 55

2x + 5 = 55

2x = 50  

x = 25; atomic number 25 = manganese (Mn)

so ;

25 = Protons

30=Neutrons  

25=Electrons

Answer:

Wall, cup, mug, plastic spoon

Explanation:

Because all of those are glass and it is important to us to make sure that if you are touching this brle careful

Answer:

Example aflask that is made in plastic,a plastic jag

Explanation:

they share some of the things in common such us

1.the height

2. the density

In order of  increasing percent water content:CoCl₂.6H₂O, Ba(OH)₂.8H₂O, MgSO₄.7H₂O

[tex]\tt \%element=\dfrac{Ar~element}{MW~compound}\times 100\%[/tex]

CoCl₂.6H₂O.MW=237.90 g/mol

6H₂O MW = 6.18=108 g/mol

[tex]\tt \%H_2O=\dfrac{108}{237.9}\times 100\%=45.4\%[/tex]

MgSO₄.7H₂O.MW=246.48 g/mol

MW 7H₂O = 7.18=126 g/mol

[tex]\tt \%H_2O=\dfrac{126}{246.48}\times 100\%=51.1\%[/tex]

Ba(OH)₂.8H₂O MW=315.48 g/mol

MW 8H₂O = 8.18=144 g/mol

[tex]\tt \%H_2O=\dfrac{144}{315.48}\times 100\%=45.6\%[/tex]

Answer:

When you wash your hands with soap, it dislodges the dirt, grease, oils, and disease-ridden fecal matter particles on your hands by creating these micelles. Surrounded by the soap, the oil molecules become suspended and distributed in the water rather than stubbornly clinging to your skin.

Explanation:

Answer:

true

Explanation:

Answer: true

Explanation: it absorbs heatt

Answer: I would say it would move 70 N right

Explanation: Well lets say its mass is heavy from the looks of the picture its a big box, anyways the girl with have all of her 30 newtons into it making it easier to move for the boy with 40 newtons plus 10 newtons left doesnt make sense neither does the 70 N left but why would it only move 10 to the right is 70 newtons are being used

on it?

Answer:

Ionic formula: KMnO4

Explanation:

Pottasium permanganate (KMnO4) is an ionic compound that contains a combination of pottasium cations (K+) and permanganate anion (MnO4-). The pair of ions that make up the ionic compound cancel out each other to make it neutral.

K+ (aq) + MnO4- (aq) → KMnO4 (aq)

MnO4- contains 1 atom of manganese with a (+7) charge and four atoms of oxygen with a (-2) charge each. This forms a +7 for Mn and -8 for O4, hence, a net total of -1.