What is the number of electronsin hydrogen?

​

One way to determine if a rock sample is metamorphic is by "noticing light and dark color bands."

Answer:

D. The one that runs out first in the reaction

Explanation:

Limiting reagent is the one that limit the yield of product because of its lower amount and run out first. Lets take an example,

Mass of calcium carbonate = 25 g

Mass of hydrochloric acid = 13.0 g

Mass of calcium chloride produced = ?

Chemical equation:

CaCO₃ + 2HCl  → CaCl₂  + H₂O + CO₂

Number of moles of CaCO₃:

Number of moles of CaCO₃ = Mass /molar mass

Number of moles of CaCO₃= 25.0 g / 100.1 g/mol

Number of moles of CaCO₃ = 0.25 mol

Number of moles of HCl:

Number of moles of HCl = Mass /molar mass

Number of moles of HCl = 13.0 g / 36.5 g/mol

Number of moles of HCl = 0.36 mol

Now we will compare the moles of CaCl₂ with HCl and CaCO₃ .

                  CaCO₃      :               CaCl₂

                  1               :               1

                 0.25           :            0.25

                HCl              :                CaCl₂

                 2                :                 1

                 0.36            :               1/2 × 0.36 = 0.18 mol

The number of moles of CaCl₂ produced by HCl are less it will be limiting reactant.

Answer:

D. The one that runs out first in the reaction​

Explanation:

it was right

Answer:

begin to move

Explanation:

When electric charges begin to move, this is when magnetism takes place.

Hope this helped!

Answer and Explanation:

Sodium has 11 protons.

To know how many protons are in an element on the periodic table, all you have to do is look at the atomic number. The atomic number is the same as the amount of protons.

The amount of protons defines the element, which is why it appears on the element description as the atomic number.

Hope this helps!

#teamtrees #WAP (Water And Plant)

Answer:

1280J are required.

Explanation:

Heat of fusion is defined as the amount of heat required to change its state from liquid to solid at its melting point at constant pressure.

As heat of fusion of gold is 64J/g, there are required 64J to melt 1g of gold at its melting point. The energy required to melt 20g is:

20g * (64J/g) =

1280J are required

Answer:

B)

Morse code

Explanation:

Morse code is a communication system developed by Samuel Morse, an American inventor, in the late 1830s. The code uses a combination of short and long pulses – dots and dashes, respectively – that correspond to letters of the alphabet.

Answer:

b

Explanation:

I got it right on the exam. Morse code is your answer.

Answer:

In first shell 2 electrons are present and 7 electrons are present in last shell

Explanation:

Answer:

21 mol of O₂ will react

Explanation:

Based on the combustion of ethanol:

C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(g)

1 mole of ethanol, C₂H₅OH reacts with 3 moles of O₂

With this ratio of 1 mol C₂H₅OH / 3 moles O₂ we can solve the moles of O₂ that react with 7mol of ethanol:

7 mol C₂H₅OH * (3mol O₂ / 1 mol C₂H₅OH) =

Answer:

0.0072mole

Explanation:

Given parameters:

Mass of the compound given  = 0.532g

Unknown:

Number of moles  = ?

Solution:

To solve this problem, we need to use the expression below:

       Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

Molar mass of Ca(OH)₂   = 40 + 2(16 + 1)  = 74g/mol

   Number of moles  = [tex]\frac{0.532}{74}[/tex]   = 0.0072mole

Answer:

An Element is a substance made up of only one type of atom as like gold, copper, oxygen, etc.

Copper sulphate with molecular formula [tex](CuSO_4)[/tex], the elements are copper, sulphur and oxygen. It is formed by combination of [tex]Cu^{2+}[/tex] cation and [tex]SO_4^{2-}[/tex] anion.

Copper sulphide with molecular formula [tex](CuS)[/tex], the elements are copper and sulphur. It is formed by combination of [tex]Cu^{2+}[/tex] cation and [tex]S^{2-}[/tex] anion.

Answer:

Describes its potential to undergo some chemical change or reaction by virtue of its composition

Answer:

See explanation

Explanation:

We separate substances based on their important properties such as reaction to heat, solubility in water, magnetic properties, etc.

To separate sodium chloride and potassium trioxonitrateV, we need to heat the solution. KNO3 dissolves at a high temperature and crystallizes out as the solution is cooled.

Hence when we heat the solution, KNO3 dissolves, as we cool the solution, solid KNO3 crystals are obtained while NaCl remains in solution.  We have now separated the two salts in the solution.

Note that the solubility of NaCl is almost independent of temperature.

Answer:

it depends on mass and speed

Answer:

vapor pressure.

Explanation:

Answer:

I think it is vapor pressure or air pressure

Answer:

h

Explanation:

get into

0.6 g NaCl

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[RxN - Balanced] Na₂CO₃ (aq) + CaCl₂ (aq) → CaCO₃ (s) + 2NaCl (aq)

[Given] 0.5 g Na₂CO₃ reacted with excess CaCl₂

Step 2: Identify Conversions

[RxN] Na₂CO₃ → 2NaCl

Molar Mass of Na - 22.99 g/mol

Molar Mass of C - 12.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of Cl - 35.45 g/mol

Molar Mass of Na₂CO₃ - 2(22.99) + 12.01 + 3(16.00) = 105.99 g/mol

Molar Mass of NaCl - 22.99 + 35.45 = 58.44 g/mol

Step 3: Stoichiometry

Step 4: Check

Follow sig fig rules and round. We are given 1 sig fig.

0.551373 g NaCl ≈ 0.6 g NaCl

Explanation:

Why brunojg driftwood makes colored fire... Burning driftwood, especially from the ocean gets a fire with blue and lavender flames. The colored fire comes from excitation of the metal salts that have soaked I to the wood. While the flames arepretty, the smoke give off of the fire is toxic

Answer:

I hope this helps 52.2 g/mol

Explanation:

1) Solve for the moles using PV = nRT:

n = PV / RT

n = [(700.0 mmHg / 760.0 mmHg atm¯1) (48.0 L)] / [(0.08206 L atm mol¯1 K¯1) (293.0 K)]

n = 1.8388 mol

2) Divide the grams given (96.0) by the moles just calculated above:

96.0 g / 1.8388 mol = 52.2 g/mol

Molecular weight of the gas is 52.2 g/mol.

Ideal gas equation is a hypothetical equation which tells about the behavior of the gas under standard condition and it ca be described as:

PV = nRT, where

P = pressure = 700.0 mm Hg (given)

V = volume = 48.0 L (given)

R = universal gas constant = 0.08206 L atm mol¯¹ K¯¹

T = temperature = 20.0 °C = 293 K

On putting theses values in the above equation we get for moles is as:

n = (700 × 48) / (0.08206 × 293) = 1.8 moles

We know that moles can be represented as:

n = W / M, where

W = given weight = 96g

M = molecular weight = to find?

Putting values in the mole equation, we get

M = 96 / 1.8 = 52.2 g/mol

Hence, molecular weight of gas is 52.2 g/mol.

To know more about ideal gas equation, visit the below link:

https://brainly.com/question/1056445

Answer:

____________________________________________________________________________

Answer:

The frequency of the wave is 2Hz.

Explanation:

The frequency of a wave is the number of waves that pass a fixed point in a given amount of time. It can be measured by counting the number of crests that pass the point in a given time period. The higher the number is, the greater is the frequency of the wave.

So, by counting the number of times the coils in the spring are widely spaced, which is 2 times in 1 second, we get the frequency of the wave.

Answer:

The answer is 2.

Explanation:

Hope this helps ;)

Answer:

26. Single Displacement

27. Synthesis

28. Decomposition

29. Combustion

30. Double Displacement

31. Combustion

32. Double Displacement

33. Decomposition

Explanation:

Hope it helped!

Answer:

b

Explanation:

because the correct answer

The pressure is doubled(2 atm)

Given

50 L of CO₂ gas at STP

Required

The pressure

Solution

Changing pressure, constant temperature⇒Boyle's Law

At a fixed temperature, the gas volume is inversely proportional to the pressure applied  

[tex]\tt \rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}[/tex]

STP⇒1 atm, T=273 K

The (new) volume of gas in half, so V₂=0.5 V₁ = 0.5 x 50 = 25 L

Because the gas volume is inversely proportional to the pressure than the pressure doubled = 2 atm

Or we can use the formula :

P₂=(P₁V₁)/V₂

P₂=(1 atm x 50 L)/25 L

P₂= 2 atm

Answer:

20%

Explanation:

I HOPE THIS HELPS YOUUUU

Answer:

20%

Explanation: