given the symbol below, how many protons are in the nucleus?

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: 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:

2 curies

Explanation:

This is actually pretty easy to explain.

The Radium-226 which is an isotope of the radium, have an activity of curie. This is basically used in radioactivity of certain elements.

As in both cases we have Radium -226 and we are only varying the mass of the Radium, then, we can just do a rule of 3 to calculate this:

1 g Ra-226 --------> 1 Curie

2 g Ra-226 -------->  X Curie

Solving for X:

X = 2 g * 1 Curie / 1 g

You can also see this by taking 2 grams of Ra per separate. On one side you have 1 g of Ra-226 and on the other side, you have another 1 g of Ra-226. Both have 1 Cury of activity. If you put both on the same side, you will have 1 Cury of 1 isotope plus 1 cury of the other isotope, final result? 2 curies.

Hope this helps

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: Potassium Chloride

Explanation:

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:

47

Ag

Silver

107.87

Explanation:

Explanation:

From top to bottom

transfer

substance

cooler

good

energy

metal

insulator

wood

heat

particles

particles

hotter

gases

convection

energy

Answer:

number 7 or 3,5

Explanation:

sana po makatulong po sa inyo

Answer:

Gravity is your answer

Explanation:

Gravity hopes this helps

Answer:

5 piece of ribbon

Explanation:

Because ther are a piece of ribbon is shade

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:

Explanation:Destructive interference occurs when the maxima of two waves are 180 degrees out of phase: a positive displacement of one wave is cancelled exactly by a negative displacement of the other wave. The amplitude of the resulting wave is zero.

If two waves that are completely out phase if meet they results in destructive interference. Hence, their intensities decreases for the resultant wave.

A wave of greater, lower, or the same amplitude is created when two waves merge through interference by combining their displacements at all points in space and time.

The interaction of waves that are coherent or correlated with one another, either because they originate from the same source or because their frequencies are similar or almost identical, leads to both constructive and destructive interference.

All sorts of waves, including light, radio, acoustic, surface water waves, gravity waves, and matter waves, can exhibit interference effects. In constructive interference, the waves are in single phase forms a resultant wave with higher amplitude.

When waves from out of phase meets, the resultant wave will have an amplitude less than the individual amplitudes.

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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:

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:

2

Explanation:

it is #2. the answer is 2

Answer:

Hope this will help you.... Take care

Answer:

it is D

Explanation:

because it is a substance that participants in a chemical reaction.

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

23.458 g

Given

Reaction

H2SO4 + 2NaNO2 → 2HNO2 + Na2SO4

24.14714 g of Na2SO4

Required

mass of NaNO2

Solution

mol Na2SO4 :

= 24.14714 : 142,04 g/mol

= 0.17

From the equation, mol NaNO2 :

= 2/1 x mol Na2SO4

= 2/1 x 0.17

= 0.34

Mass NaNO2 :

= 0.34 x 68,9953 g/mol

= 23.458 g

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:

D. chemical energy

Explanation:

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

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: 13.1

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

The products in the reaction HCI + NaOH → NaCl + H20, are C. NaCl and H20.

The reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) is a neutralization reaction, which means that it produces a salt and water. In this case, the salt is sodium chloride (NaCl) and the water is H2O.

The other options are not correct because they do not include all of the products of the reaction. Option (A) includes HCl and NaOH, but it does not include H2O. Option (B) only includes HCl and NaOH. Option (D) only includes NaOH and H2O.

In conclusion, option C is correct.

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Answer: The partial pressure of oxygen in the tank is 82.95 kPa.

Explanation:

According to Raoult's law, the partial pressure of a component at a given temperature is equal to the mole fraction of that component multiplied by the total pressure.

[tex]p_{O_2}=x_{O_2}\times P[/tex]  

where,

[tex]p_{O_2}[/tex] = partial pressure of oxygen

[tex]x_{O_2}[/tex] = mole fraction  of oxygen  

[tex]P[/tex] = Total pressure  

[tex]x_{O_2}=\frac{n_{O_2}}{n_{O_2}+n_{He}}[/tex],

where [tex]n_{O_2}[/tex] = moles of oxygen =[tex]\frac{68g}{32g/mol}=2.125[/tex]

[tex]n_{He}[/tex] = moles of Helium =[tex]\frac{32g}{4g/mol}=8[/tex]

[tex]x_{O_2}=\frac{2.125}{2.125+8}=0.210[/tex]

[tex]p_{O_2}=0.210\times 395kPa=82.95kPa[/tex]  

Thus the partial pressure of oxygen in the tank is 82.95 kPa.

Answer:

3m/s²

Explanation:

Force applied to an object can be calculated thus;

F = ma

Where;

F = force applied (Newtons)

m = mass of substance (kg)

a = acceleration (m/s²)

According to the information provided in this question, F = 12.0 newtons, m = 4.0 kg, a = ?

Derived from F = m.a

We have; a = F/m

a = 12/4

a = 3

The resultant acceleration of the object is 3m/s².

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...