Please help...Thank so much!!

I had this question on a test in K12

The answer is By increasing the number of coils in the wires of the electromagnet.

increasing coil wires is correct, like the other person answered.

Answer:

S=Solid

Mg=Solid

B=Solid

Ca=Solid

Ar=Gas

H=Gas

Cs=Solid

Zn=Solid

Br=Liquid

Sb=Solid

N=Gas

Hg=Liquid

Explanation:

Answer:

47

Ag

Silver

107.87

Explanation:

Answer: Potassium Chloride

Explanation:

Answer:

1.

CH4 + Cl2 → CH3-Cl + HCl

2CH3-Cl +2Na → C2H6

2.

CH3-CH2-OH ---(conc. H2SO4)----> CH2=CH2 + H2O

Explanation:

1. Conversion of methane to ethane

Step 1 - Treat methane with chlorine gas presence of ultraviolet light

CH4 + Cl2 → CH3-Cl + HCl

Step 2 - Treat chloromethane formed in step 1 with the sodium metal and dry ether  (Wrutz synthesis)

2CH3-Cl +2Na → C2H6

2. On treating ethanol with excess of concentrated sulfuric acid, it converts into ethene

CH3-CH2-OH ---(conc. H2SO4)----> CH2=CH2 + H2O

Answer:

B for sure

Explanation:

Because they all consume

Answer: It is molecular

Explanation: The reason it is molecular is because it has no ions in the formula it only has the molecular mass which is the reason why it is in fact molecular

Answer: The number of protons in cation is more than the number of electrons

Explanation:

cations are positive ions that means that they lose electrons to be stable nd have electron configuration (atomic number ) equivalent to the preceding noble gas

as : sodium 11 , it loses on electron to be stable and its electron configuration is equivalent to neon 10

so ,the number of protons in cation is more than the number of electrons

i hope it helps!

Answer:

Its called contraction.

Explanation:

Answer:

Gravity is your answer

Explanation:

Gravity hopes this helps

Answer: a: 0.04

b: 0

c: x

d: x

e: x

f: 0.04

Explanation:

Answer:

1. 35g NaCl.

2. 234g sugar.

3. 0.506L of concentrated nitric acid are needed.

4. 1.67L of 9.0M copper (II) sulfate are needed

Explanation:

Molarity is defined as the ratio between moles of solute and the volume of the solution.

1. 1.00L * (0.60mol / L) = 0.60 moles NaCl are dissolved

To convert moles to mass we must use its molar mass:

0.60mol NaCl * (58.44g/mol) =

35g NaCl

2. 2L * (0.342mol / L) = 0.684 moles Sugar = moles sucrose

0.684 mol * (342.30g / mol) = 234g sugar

3. 4L of a 2.0M are:

4L * (2.0mol/L) = 8moles

8mol * (1L / 15.8mol) = 0.506L of concentrated nitric acid are needed

4. 3.0L  * (5.0 mol / L) = 15.0 moles copper (II) sulfate.

15.0mol * (1L / 9.0mol) = 1.67L of 9.0M copper (II) sulfate are needed

An illustration of a mixture is Chex Mix. It is made out of a variety of blended ingredients, including Chex cereal, pretzels, almonds, and spices.

A mixture is a grouping of two or more compounds that are physically mixed but are not chemically bound in chemistry. Each component of the combination keeps its unique characteristics and can be physically separated from it using techniques like filtration or distillation. Both homogeneous and heterogeneous mixtures exist. Homogeneous mixtures, like seawater, have a consistent composition throughout, whereas heterogeneous combinations, like oil and water, have separate phases and an unequal distribution. An illustration of a mixture is Chex Mix.

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Answer:

Ba

Explanation:

The trend for atomic radius is that it increases as you go down and decreases as you go right.

Answer:

5 piece of ribbon

Explanation:

Because ther are a piece of ribbon is shade

Answer:

I2 + 2S2O3^2- --------> S4O6^2- + 2I^-

Explanation:

The correct equation is;

2Na2S2O3 + I2 → Na2S4O6 + 2NaI

Oxidation half equation;

2S2O3^2- --------> S4O6^2- + 2e-

Reduction half equation;

I2 + 2e ----------> 2I^-

Overall balanced redox reaction equation;

I2 + 2S2O3^2- --------> S4O6^2- + 2I^-

Answer:

During the fractional distillation of crude oil: heated crude oil enters a tall fractionating column , which is hot at the bottom and gets cooler towards the top. vapours from the oil rise through the column. vapours condense when they become cool enough.

Hope it helps you :)

The fractionating column's crystal clear glass beads provide such a vast surface area for heated vapors to cool and condensed continuously.

The fractionating column is inserted into the mouth of the distillation flask, which contains the saturated solution to be separated.

Heated crude oil is pumped into a tall fractionating column that is heated at the bottom and cools as it rises.

The oil fumes ascend through the column. When vapors cool down sufficiently, they condense. Various heights are used to lead liquids out of the columns.

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Answer:

Since there's only 1 hour before your next dose, you skip the missed ... It happens when bacteria adapt to withstand one or more antibiotics.

Explanation:

Answer:

D. chemical energy

Explanation:

Food contains chemical energy as chemical energy is stored in bonds.

Explanation:

All atoms naturally want to have a completely full outermost shell of electrons.Howevee, elements in that first column of the periodic table all have one electron in their outermost shell. ..."since the alkali metals only have one valence electron,they typically achieve this state by giving up that electron.

I hope it's helpful!

Answer:

7.98 × 10^3grams.

Explanation:

To find the mass of fluorine in the number of atoms provided, we first divide the number of atoms by Avagadros number (6.02 × 10^23atoms) to get the number of moles in the fluorine atom. That is;

number of moles (n) = number of atoms (nA) ÷ 6.02 × 10^23 atoms

n = 2.542 × 10^26 ÷ 6.02 × 10^23

n = 0.42 × 10^ (26-23)

n = 0.42 × 10^3

n = 4.2 × 10^2moles

Using mole = mass ÷ molar mass

Molar/atomic mass of fluorine (F) = 19g/mol

mass = molar mass × mole

Mass (g) = 19 × 4.2 × 10^2

Mass = 79.8 × 10^2

Mass = 7.98 × 10^3grams.

Beryllium (Be) will form an ionic compound with nitrogen with the general formula M[tex]_3[/tex]N[tex]_2[/tex]. Therefore, the correct option is option D.

Metal refers to any of a class of substances that have excellent electrical and thermal conductivity, malleability, flexibility, or light reflection. Metals account for over 75% of any and all chemical elements currently known.

Aluminum, iron, salt, potassium, and magnesium are the most abundant elements in the Earth's crust. Most metals can be found in ores, while some, such as copper, gold, platinum, even silver, are frequently found in their free state because they do cannot easily react with other elements. Beryllium (Be) will form an ionic compound with nitrogen with the general formula M[tex]_3[/tex]N[tex]_2[/tex].

Therefore, the correct option is option D.

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Answer:

b)

Explanation:

A substance that cannot be broken down into simpler substances by chemical means. An element is composed of atoms that have the same atomic number, that is, each atom has the same number of protons in its nucleus as all other atoms of that element.

Answer:

Figure B show element

Explanation:

Element is made up of same type of atoms and in figure b only one type of atom is present

Answer: 13.1

Explanation: just round the .06 to 1 creating three sig figs.

Explanation:

ok, forest ecosystem always recycle its resources;

dead animals are always returned to the ground, providing fertility of trees & other vegetation for the animals that consume its harvest...this ecosystem provides natural remedies for human ailments, rich soil provides farming, and re using of such, as long as it is not over harvested. The Indians that live there have vast knowledge of their surroundings...

Explanation:

From top to bottom

transfer

substance

cooler

good

energy

metal

insulator

wood

heat

particles

particles

hotter

gases

convection

energy

Answer:

c.atomic mass

Explanation:

The total number of protons plus neutrons is called the atomic mass number for the atom.

Moles Fe₂O₃ produced : 1.16 moles

Given

2.32 moles of iron

Required

moles of Fe2O3

Solution

The reaction coefficient in a chemical equation shows the mole ratio of the reacting compounds (reactants and products)

Reaction

4 Fe + 3 O₂ ⇒  2 Fe₂O₃

From the equation, mol ratio Fe : mol Fe₂O₃ = 4 : 2, so mol Fe₂O₃ :

= 2/4 x mol Fe

= 2/4 x 2.32

= 1.16 moles

Answer:

6.022×1023 atoms

Explanation: