If 3.00 g of limestone reacted, what mass of calcium chloride would be produced?A) Calcium chloride
B) Carbon dioxide
C) water

Answers

Answer 1

Answer: a) CaCO₃ + 2 HCl = CaCl₂ + H₂O + CO₂
↓ ↓
1 mole 1 mole

molar mass :

CaCO₃ = 100.0 g/mol CaCl₂ = 111 g/mol

100 g CaCO₃ ------------- 111 g caCl₂
3.00 g CaCO₃ --------------- ?

3.00 * 111 / 100 =

333 / 100 = 3.33 g of CaCl₂
________________________________________

b) molar mass CO₂ = 44.0 g/mol

100 g CaCO₃ ---------- 44.0 g CO₂
3.00 g CaCO3 ------------- ?

3.00 * 44 / 100 =

132 / 100 = 1.32 g of CO2
____________________________________

c) molar mass H₂O = 18.0 /mol

100 g CaCO3 ------- 18.0 g
3.00 g CaCO3 ------- ?

3.00 * 18.0 / 100 =

54 / 100 = 0.54 g of H₂O
___________________________________

hope this helps!

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An atom is determined to contain 12 protons, 10 electrons, and 12 neutrons. What are the mass number and charge of this atom or ion? Select one: a. mass number: 24, charge: +2 b. mass number: 22, charge: neutral c. mass number: 34, charge: -2 d. mass number: 34, charge: +2
A student records the mass of a piece of iron. The iron is then left outside until it rusts. What type of reaction occurs, and how does the mass of the object after rusting compare with its original mass?

When iron reacts with oxygen to form rust, each iron atoma. loses three ions.
c. gains three ions.
b. loses three electrons.
d. gains three electrons.

Answers

Iron rust is the oxidation process that affects iron. Iron reacting with oxygen loses three electrons to form rust. Thus, option b is accurate.

What are oxidation and reduction?

Oxidation is the redox process that raises the oxidationnumber by losing the electron of the species and the reduction will decrease the oxidation state by accepting the electrons.

The iron loses its three electrons when reacts with the atmospheric oxygen in rusting and gets oxidized. The metal oxide is produced as a result of the rust.

Therefore, option b. losing threeelectrons to produce rust is correct.

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When iron reacts with oxygen to form rust, each iron atom loses three electrons. Hope this helps :D

Use the following table to answer the question. Strong acids Weak acids Weak bases Strong bases HBr CH3COOH NH3 NaOH HCl HF NH4OH KOH H2SO4 HCN Cu(OH)2 Ca(OH)2 Which of these salts has the highest pH? K2SO4 Cu2SO4 NH4Cl NaCH3COO

Answers

Answer: D. NaCH3COO

Explanation:

Let's go through each of these salts and think about the reactions behind them. Keep in mind that the salt with the highest pH is the most basic.

(The underlined atoms can match the chemical formula for the salt. By matching the atoms, we can reason which bases and which acids reacted to produce a given salt.)

A. K2SO4

Using the table, we can assume that this salt was produced by with the reactants of the strong baseKOH and the strong acid H2SO4
A strong base and strong acid react to produce a more neutral salt, so this is likely the incorrect answer

B. Cu2SO4

Using the table, we can assume that this salt was produced by with the reactants of the weak baseCu(OH)2 and the strong acid H2SO4
A weak base and strong acid react to produce a more acidic salt, so this is likely the incorrect answer

C. NH4Cl

Using the table, we can assume that this salt was produced by with the reactants of the weak baseNH4OH and the strong acid HCl
A weak base and strong acid react to produce a more acidic salt, so this is likely the incorrect answer

D. NaCH3COO

Using the table, we can assume that this salt was produced by with the reactants of the strong baseNaOH and the weak acidCH3COOH
A strong base and weak acid react to produce a more basic salt, so this is likely the CORRECT answer

Final answer:

Sodium acetate (NaCH3COO) has the highest pH among the given salts because it is derived from a strong base and a weak acid, resulting in a basic solution upon dissolution in water.

Explanation:

The question asks which salt among K2SO4, CuSO4, NH4Cl, and NaCH3COO has the highest pH. To determine this, we consider the acidic or basic nature of the ions in each compound.

Sodium acetate (NaCH3COO) is formed from sodium hydroxide (NaOH), a strong base, and acetic acid (CH3COOH), a weak acid. When this salt dissolves in water, it produces Na+ ions and CH3COO- ions. The acetate ion can react with water to produce a small amount of OH- (hydroxide ions), causing the solution to be basic.

Ammonium chloride (NH4Cl) is derived from the weak base ammonia (NH3) and hydrochloric acid (HCl), a strong acid. This salt in solution will lower the pH due to the production of H+ ions from NH4+.

Potassium sulfate (K2SO4) and Copper(II) sulfate (CuSO4) are salts of sulfuric acid (H2SO4), a strong acid, and strong bases (KOH and Cu(OH)2 respectively). Since both strong acids and strong bases completely dissociate, the resulting salts typically do not affect the pH significantly.

Of these, NaCH3COO will have the highest pH because it creates a basic solution when dissolved in water.

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What is the speed of a man that travels 2 meters in 6.5 seconds?

Answers

Answer:

≈ 0.31 m/s

Explanation:

v = d/t

= 2m/6.5s

= 0.3079 m/s

≈ 0.31 m/s

Answer:

0.305556 m / s

Explanation:

Speed = distance / time

2 metres = 0.002 km

6.5 sec = 0.00180556 hrs

Therefore,

Speed = 0.002 / 0.00180556

= 1.1 km / hr

= 0.305556 m / s

The various components of a mixture or do not combine chemically true false

Answers

im pretty sure the answer is false

If element x has 55 protons how many electrons does it have

Answers

Answer: 55

Explanation: A atom consists of a nucleus and electrons.Nucleus contain neutrons with no charge and protons with positive charge. The electrons bearing negative charge revolve around the nucleus.

An electrically neutral atom contains equal number of protons and electrons. Thus if a neutral element X contains 55 protons, it also contains 55 electrons.

If the element has 55 protons it is celcium and it also has 55 electrons. It has an atomic mass of 133 (132.9) so to get the number of neutrons you subtract the atomic mass and the number of protons.

How far can a cough travel?

Answers

Traveling upwards of 200 mph or 320 km/h, and accelerating in a matter of seconds, germs from a cough or sneeze can travel a great distance very quickly.

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A 1.00 g sample of a hydrogen peroxide (H2O2) solution is placed in an Erlenmeyer flask and diluted with 20 mL of 1 M aqueous sulfuric acid. To this solution is added 0.0200 M KMnO4 solution via a buret, until a pale purple color persists. This requires 22.50 mL of KMnO4 solution. What is the percent by mass of hydrogen peroxide in the original solution? (A) 0.613% (B) 1.53% (C) 3.83% (D) 7.65%