What is the sign of a chemical reaction

Answer:

2365 g

Explanation:

The mass of CaCl₂ will be 110.98 grams, this can be calculated by using the molarity formula.

It is defined as the ratio of a number of moles of solute to the volume of solution in liters.

It is given by:

M= n/V

What information do we have?

V= 1.0 L

M= 1.0 M

Molar mass of CaCl₂  = 110.98g/mol

To find:

m=?

M= n/V

n= M/V

n= 1 mole

A Number of moles is the ratio of mass over the molar mass.

n = m/ M

1 mole= m / 110.98 g/mol

m= 110.98 grams

Thus, the mass of calcium chloride is 110.98 grams.

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Answer:

56

Hope this helps :)

Answer:

Most Likely A High Pressure Center

Explanation:

is most likely high pressure Center because on a weather map over the southern western Pennsylvania there's mostly high pressure over there. The descending air diverges and spreads out from the center and their is a Coriolis effect which causes the Diverging air to rotate in a clockwise direction.

Answer:

0.181 M

Explanation:

Begin by finding the total moles by using the volume and molarity given:

[tex]\frac{3.25 mol}{1000 mL} x \frac{25.0 mL}{1} = 0.08125 mol[/tex]

(Remember molarity is mol/L, which is equal to mol/1000 mL.)

Divide the moles by the volume after dilution:

[tex]\frac{0.08125 mol}{450.0 mL} x \frac{1000 mL}{1 L} = \frac{0.181 mol}{L} = 0.181 M[/tex]

The concentration of the diluted solution is 0.181 M.

Answer:  [tex]2C_{12}H_{26}(l)+37O_2(g)\rightarrow 24CO_2(g)+26H_2O(g)[/tex]

2.  369 L

Explanation:

1. Combustion is a chemical reaction in which hydrocarbons are burnt in the presence of oxygen to give carbon dioxide and water.

The balanced chemical reaction is:

[tex]2C_{12}H_{26}(l)+37O_2(g)\rightarrow 24CO_2(g)+26H_2O(g)[/tex]

2. To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{220g}{170.3g/mol}=1.29moles[/tex]

According to stoichiometry :

2 mole of dodecane produces = 24 moles of carbon dioxide

Thus 1.29 moles of dodecane produces = [tex]\frac{24}{2}\times 1.29=15.5 moles[/tex] of carbon dioxide

According to ideal gas equation:

[tex]PV=nRT[/tex]

P = pressure of gas = 1 atm

V = Volume of gas = ?

n = number of moles = 15.5

R = gas constant =[tex]0.0821Latm/Kmol[/tex]

T =temperature =[tex]17^0C=(17+273)K=290K[/tex]

[tex]V=\frac{nRT}{P}[/tex]

[tex]V=\frac{15.5\times 0.0821L atm/K mol\times 290K}{1atm}=369L[/tex]

Thus the volume of carbon dioxide gas that is produced is 369 L

Answer: Options 1,3,6

Answer: A) More base is likely required to reach the endpoint for the diprotic acid than for the monoprotic acid under these conditions

Explanation:

The monoprotic acid (HA) has a valency of 1 and diprotic acid  [tex](H_2A)[/tex] has a valency of 2.

As the concentration and volume of the diprotic acid and the monoprotic acids are equal.

The neutralization reaction for monoprotic acid is:

[tex]HA+BOH\rightarrow BA+H_2O[/tex]

The neutralization reaction for diprotic acid is:

[tex]H_2A+2BOH\rightarrow B_2A+2H_2O[/tex]

Thus more number of moles of base are required for neutralization of diprotic acid and thus the volume required will be more as concentration and volume of the diprotic acid and the monoprotic acids are equal.

Answer:

The correct answer is a. True

Explanation:

The main components of cell membranes are lipids and proteins. Lipids are responsible to form the structural barrier with the surroundings. The general structure of the membrane is made up of phospholipids, which have a part of the molecule with affinity to other lipids, and another part with affinity to water. The most common and abundant phospholipids are glycerophospholipids.

Therefore, the sentence is true.  

Calcium also be called the calcium of citric acid because calcium citrate malate contains the calcium salt of citric acid and malic acid.

Citric acid is an organic compound with a chemical formula [tex]HOC(CO_2H)[/tex].

Calcium citrate malate is a water-soluble calcium supplement. It is the calcium salt of citric acid and malic acid with variable composition.

Hence, calcium is also called the calcium of citric acid.

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Answer:

temperature

Explanation:

hope this helps

Answer:

HCI+Ca(OH)2

Explanation:

Answer:

B

Explanation:

don't try to do that at home

Answer:

the correct answer to your question is b

Answer:

White blood cells are cells of the system, which play a neighborhood in protecting the body against infectious diseases and foreign bodies. These cells flow with the blood throughout the body then scavenge and kill the parasites and foreign bodies. Hence, they are called soldiers of the body.

I hope it's helpful!

Answer: H2o

Explanation:

because oxygen is in the air

Answer: [tex]CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2[/tex]

Explanation:

Neutralization is a chemical reaction in which acid and base combine to form salt and water. Acids donate[tex]H^+[/tex] and bases donate [tex]OH^-[/tex]  in water which combine to form water molecules.

The chemical reaction between calcium carbonate and hydrochloric acid forms calcium chloride , water and carbon dioxide.

The balanced chemical equation is:

[tex]CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2[/tex]

Answer:

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Explanation:

owa owa owa owa owa owa owa

Answer:

0.648 g

Explanation:

Step 1: Write the balanced equation

2 Na(s) + 2 H₂O(l) ⇒ 2 NaOH(aq) + H₂(g)

Step 2: Calculate the partial pressure of H₂

The total pressure (P) is equal to the sum of the partial pressures of hydrogen and water vapor.

P = pH₂O + pH₂

pH₂ = P - pH₂O

pH₂ = 759 mmHg - 23.8 mmHg = 735 mmHg

Step 3: Convert "pH₂" to atm

We will use the conversion factor 1 atm = 760 mmHg.

735 mmHg × 1 atm/760 mmHg = 0.967 atm

Step 4: Convert "25°C" to K

We will use the following expression.

K = °C + 273.15 = 25°C + 273.15 = 298 K

Step 5: Calculate the moles of hydrogen (n) formed

We will use the ideal gas equation.

P × V = n × R × T

n = P × V/R × T

n = 0.967 atm × 8.11 L/(0.0821 atm.L/mol.K) × 298 K = 0.321 mol

Step 6: Calculate the mass corresponding to 0.321 moles of hydrogen

The molar mass of H₂ is 2.02 g/mol.

0.321 mol × 2.02 g/mol = 0.648 g

Answer:

pH = 3.34

Explanation:

We can calculate the pH using Henderson-Hasselbach's equation:

for HCOOH, pKa = 3.75.

We can calculate [HCOO⁻] and [HCOOH] using the given number of moles for each one and the final volume:

Then we proceed to calculate the pH:

The pH of the resulting solution is 3.34.

Since  

Final Volume = 44.12 mL + 250 mL = 294 mL

Now

= 294 mL / 1000

= 0.294 L

Now

[HCOO⁻] = 0.036 mol / 0.294 L = 0.122 M

[HCOOH] = 0.091 mol / 0.294 L = 0.310 M

So, the pH should be

= 3.75 + log0.122/0.310

= 3.34

hence, The pH of the resulting solution is 3.34.

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Answer:

C. digestive; circulatory

Explanation:

It is the correct answer..

Answer:

Vaccines include a variety of ingredients including antigens, stabilizers, adjuvants, antibiotics, and preservatives. They may also contain residual by-products from the production process.

Answer:

C. Sebum

Explanation:

C. Sebum

Answer:false

Explanation:false

Answer:

true

Explanation:

hoping for the brainliest

Answer:

13414 years

Explanation:

From;

0.693/ t1/2 = 2.303/t log No/N

t1/2 = half life of  C-14

t = age of the sample

No= initial amount of C-14

N = present amount of C-14

From the question, N = 0.2 No

Hence;

0.693/5700 = 2.303/t log No/0.2No

1.2 * 10^-4 = 2.303/t log 1/0.2

1.2 * 10^-4 = 1.6097/t

t = 1.6097/1.2 * 10^-4

t = 13414 years

Answer:

The technique is called weighing by difference

Answer:

Because The white gene is the recessive gene and the brown gene is the dominant gene hence all the offspring being brown instead of white :)

Explanation:

Thank me later!

Answer:

Wymień różnice między systemem palowym a systemem wiązkowym rośliny