When equal volumes of 0.5 M HCl and 0.5 M Ca(OH)2 are mixed, the resulting solution is

Answer:

10.9%.

Explanation:

The first thing to do in order to solve this question is to Determine the value for the volume of the the cube. This can be done by taking the cube root of the length of the cube;

The volume of the cube = (length of the cube)^3 = length × length × length = 1.72 × 1.72 × 1.72 =( 1.72)^3 = 5.09cm^3.

The next thing you do is to Determine the exponential density, the can be done by using the formula below;

The exponential density = mass/ volume = 55. 786/ 5.09 = 10.96 g/cm^3.

Therefore, the percent error = (true density of the cube - exponential density of the cube)÷ true density of the cube × 100.

Hence, the percent error = 12.30 - 10.96/12.30 × 100 = 10.9%.

During a chemical reaction nb of atoms and mass is always conserved , so mass of Reactants is equal mass of Products.

Answer: The volume of a saturated solution of X in water that would contain 34.0g of X  is 43.9 ml

Explanation:

Solubility is defined as the amount of solute dissolved per 100 ml of the solvent at a fixed temperatur.

Given :  solubility of ionic compound X  in water at [tex]15^0C[/tex] = 0.776 g/ml

0.774 g of X is contained in = 1 ml

Thus 34.0 g g of X is contained in = [tex]\frac{1}{0.774}\times 34.0=43.9 ml[/tex]

Thus the volume of a saturated solution of X in water that would contain 34.0g of X  is 43.9 ml

Answer:

0.17 atm

Explanation:

Raoult´s law can be applied in solving this problem:

Pa= XaPºa   (a= acetyl bromide in this case)

where Pa = partial pressure acetyl bromide

         Xa = mole fraction of acetyl bromide in the solution

          Pºa=  vapor pressure of pure acetyl bromide = 0.75 atm(given)

Hence we can find the mole fraction of the acetone in the mixture:

Let the number of moles of acetone be a and the number of moles of thiophene be t

Xa = mol of a / ( mol of a + mol of t )        

We now have;

Molar Weight of  a= 112.95 g/mol  

number of moles of a = 51.8 g/mol x 1 mol/122.95 g  =  0.42 moles

Molar Weight of t = 84.14 g/mol  

number of moles of  t = 123 g x  1mol/84.14 g= 1.46 mol

mole fraction of a; Xa = 0.42/ (0.42 + 1.46) = 0.22

Pa = 0.22 x 0.75 atm = 0.17 atm

False.

Arteries are said to be more muscular.

That means Arteries ARE* MUSCLES

Answer:

The number of valence electrons in an atom is reflected by its position in the periodic table of the elements (see the periodic table in the Figure below). Across each row, or period, of the periodic table, the number of valence electrons in groups 1–2 and 13–18 increases by one from one element to the next

The change in the velocity = 4 m/s

Acceleration = 4 m/s²

Given

vo = initial velocity = 4 m/s

vf = final velocity = 8 m/s

t = 1 s

Required

The change in the velocity

Acceleration

Solution

the change in velocity =

[tex]\tt vf-vo=8-4=4~m/s[/tex]

Acceleration = ratio of a change in velocity and the time

[tex]\tt a=\dfrac{\Delta v}{t}= \dfrac{vf-vo}{t}[/tex]

Input the value :

[tex]\tt a=\dfrac{4~m/s}{1~s}=4~m/s^2[/tex]

Mass of Aluminum= 8.829 g

Given

Reaction

2Al + 6HCl → 2AlCl₃ + 3H₂

Required

mass of Aluminum

Solution

At STP, 1 mol gas = 22.4 L

For 11 L of Hydrogen :

= 11 : 22.4

= 0.491

From equation, mol ratio Al : H₂ = 2 : 3, so mol Al :

= 2/3 x mol H₂

= 2/3 x 0.491

= 0.327

Mass Aluminum(Ar=27 g/mol) :

= 0.327 mol x 27 g/mol

= 8.829 g

Answer:each of a number of concentric rings in the cross section of a tree trunk, representing a single year's growth.

Explanation:it tell whats the age of the tree.

Explanation:

Displacement is the distance travelled in a specific direction. Unlike distance, displacement is a vector quantity with both magnitude and directional attribute.

When we specific displacement values, we must indicate the direction of motion to complete its description.

For example, 50m is a distance value. It has a magnitude but no direction.

When we say 50m due south, this is a displacement because both magnitude and direction are accurately specified and defined.

The balanced equation :

2Al₂O₃⇒ 4Al+3O₂

Given

Reaction

Al₂O₃⇒ Al+O₂

Required

Balanced equation

Solution

A chemical reaction is said to be balanced if the number of elements involved in the reaction is the same (either the reactants or the products)

The reaction above is said to be unbalanced because the number of elements Al and O in the reactants and products is not the same.

The balancing step

1. Give a coefficient

Al₂O₃⇒ aAl+bO₂

2. Make an equation

Al, left = 2, right = a⇒a=2

O, left = 3, right = 2b⇒2b=3⇒b=3/2

The equation becomes :

Al₂O₃⇒ 2Al+3/2O₂ x2

2Al₂O₃⇒ 4Al+3O₂

cutting a piece of paper

Explanation:

Answer:

A physical change occurs when a substance changes, but no new substance is formed.

Explanation:

Answer:

D = Mass =  42.6 g

Explanation:

Given data:

Mass of phosphorus react = 33 g

Mass of oxygen needed = ?  

Solution:

Chemical equation:

4P + 5O₂     →      2P₂O₅

Number of moles of phosphorus:

Number of moles = mass/molar mass

Number of moles = 33 g/ 30.97 g/mol

Number of moles = 1.065 mol  

now we will compare the moles of phosphorus and oxygen.  

               P         :       O₂  

               4         :        5  

        1.065        :        5/4×1.065 = 1.33mol

Mass of oxygen needed:

Mass = number of moles × molar mass

Mass = 1.33 mol × 32 g/mol  

Mass = 42.6 g

Thus, 43.6 g of oxygen needed to react with 33 g of phosphorus.

Answer:

D

Explanation:

Algae produces their own energy through photosynthesis, making them autotrophs. Fish have to consume energy by eating other organisms making them heterotrophs.

Answer:  Light is a transverse, electromagnetic wave that can be seen by the typical human. The wave nature of light was first illustrated through experiments on diffraction and interference

Explanation:

Answer:

Light energy

Explanation:

1.69 × 10²⁴ atoms CaCl₂

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

312 g CaCl₂ (calcium chloride)

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of Ca - 40.08 g/mol

Molar Mass of Cl - 35.45 g/mol

Molar Mass of CaCl₂ - 40.08 + 2(35.45) = 110.98 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

1.69298 × 10²⁴ atoms CaCl₂ ≈ 1.69 × 10²⁴ atoms CaCl₂

Answer:

5162.539 g

Explanation:

Let assume that the volume changes from [tex]4.00 \times 10^6 \ L[/tex] to [tex]4.50 \times 10^6 \ L[/tex].

And if the addition of energy as heat is [tex]1.3 \times 10^8 \ J[/tex]

Then; we can say that the total heat that is taken by the ballon = [tex]1.3 \times 10^8 \ J[/tex]

[tex]= 1.3 \times 10^5 \ kJ[/tex]

The total heat supplied = total heat coming from the combustion of propane

∴

[tex]= \dfrac{100}{50} \times 1.3 \times 10^5 \ kJ[/tex]

[tex]= 2.6 \times 10^5 \ kJ[/tex]

[tex]C_3 H_{8(g)} + 5O_{2(g)} \to #CO_{2(g)} + 4H_2O_{(l)} \ \ \Delta H = -2221 \ kJ[/tex]

If 2221 kJ is produced as a result of the combustion of 44.1 g [tex]C_3H_{8(g)}[/tex]

Then;

[tex]2.6 \times 10^5 kJ[/tex] will produce [tex]= \Big( \dfrac{44.1 \times 2.6 \times 10^5}{2221} \Big ) \ g[/tex]

= 5162.539 g

Thus, the mass of the propane that must be burned = 5162.539 g

Answer:

Magnesium (Mg) and Barium (Ba) are most similar in terms of properties.

Explanation:

The periodic table of elements is organized with elements classified by atomic number. Each column in the table represents elements grouped together by protons in the nucleus and as a result of that also charge. The first column of elements have a +1 charge, while the second column have a +2 charge.

Electronegativity, mass and weight can also be determined by the location of elements in the table, with elements becoming more electronegative from left (least amount) to right (most) and more heavy from top to bottom. Because Magnesium and Barium are in the same column, while gold is in a different column (and assigned a different color) it indicates the element gold is not like the other two and has different properties.

Based on the organization of elements in the  periodic table, the two elements that will be similar are magnesium (Mg), barium (Ba).

The periodic table is arranged in rows called periods and columns called groups.

Elements in the same group of the periodic table are chemically similar because they have the same number of electrons in their outermost shell and consequently undergo the same kind of chemical reactions.

Having said that, Barium and magnesium both belong to group 2 of the periodic table hence they have the similar properties because they are all members of the same group.

Learn more: https://brainly.com/question/11155928

Explanation:

determine the genotypes of the parent organisms.

write down your "cross" (mating)

draw a p-square.

4. " ...

determine the possible genotypes of the offspring by filling in the p-square.

summarize results (genotypes & phenotypes of offspring)

Answer:

The answer is Ytterbium but it is one of it isoptoped so techniacally it would be Ytterbium 102.

Answer:

composition reaction has only one reactant

I hope it helps you

Answer:

one mole or 31.9

Explanation:

I hope this helps

Mass of Mercury(Hg) : 55.8 g

Given

Reaction

2HgO ⇒ O₂ + 2Hg

Required

Mass of Mercury

Solution

Conservation of mass applies to a closed system, where the masses before and after the reaction are the same

So mass of reactants = mass of products

Mass of reactants = mass HgO = 60 g

Mass of products = mass O₂ + mass Hg

60 g = 4.2 g + mass Hg

mass Hg = 60 - 4.2

mass Hg = 55.8 g

Answer:

80.685 feet/second

Explanation:

Answer: water molecules are polar and Os are slightly negative. Na loses its electron to the nearest H and so is positive. The overall reaction is that the single electron of Na attaches to a H, breaking the bond with O. This leaves Na+ and the OH- ions in solution, while the H atoms form H2 and are released as gas.

Explanation:

According to the forces of attraction in molecules where there is attraction between opposite charges the water molecules orient themselves such that their oxygen atoms are facing the sodium.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

Learn more about forces of attraction,here:

https://brainly.com/question/10957144

#SPJ2

Answer :

Dipole moments occur when there is a separation of charge. Dipole moments occur due to atoms electronegativity, where one atom has the ability to attract electrons towards it giving it a negative charge and the one deficient in electrons acquire a positive charge called as the bond moment.

But if the bond moments are equal and opposite in direction , they cancel each other and thus there is no net dipole moment in the molecule.

For example: In carbon dioxide , both the -C=O bonds are polar but as the molecule is linear and the the magnetic moments are equal and oppposite, they cancel each other and the molecule is non polar.