CHEMISTRY MIDDLE SCHOOL

Calcium hydroxide reacts with a substance to produce calcium carbonate
name the substance

Answers

Answer 1
Answer: Calcium Hydroxide (Ca(OH)2) reacts with the Carbon Dioxide (CO2) present in the Air to form Calcium Carbonate (CaCO3) and Water (H2O).

The equation looks something like this -->

Ca(OH)2 + CO2 = CaCO3 + H2O
Answer 2
Answer: Let the substance be p

CaOH + p = CaCO3

following the laws of chemical reactions and law of conservation of mass, p will be 1 atom of carbon dioxide and 2 atoms of oxygen. Thus, the p will be CO2.

Thus, CaOH + CO2 = CaCO3

Please note that during this process, water will also be produced.

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Which notations represent different isotopes of the element sodium?(1) 32S and 34S (3) Na+ and Nao
(2) S2- and S6+ (4) 22Na and 23Na

Answers

The notations representing the different isotopes of the element sodium are:

4) 22Na and 23Na

The total number of recognized isotopes of sodium is 20. It starts from 18Na upto 37Na with two isomers (22mNa and 24mNa).

23Na is considered as monoisotopic element meaning it has a single stable isotope making it primordial isotope. 23Na is a single isotope since earth was formed. It has a standard atomic mass of 22.989 769 28(2) u.

22Na, a positron-emitting isotope with a long half life = 2.605 years. It is used to create test objects and point sources for PET or positron emission tomography.

What is a chemical property

Answers

any of a material's properties that becomes evident during, or after, a chemical reaction; that is, any quality that can be established only by changing a substance's chemical identity.
Material's feature  that becomes visible in a chemical reaction.

1. Aqueous solutions of chromium(III) iodide and sodium hydroxide react to give a chromium(III) hydroxide precipitate and aqueous sodium iodide.2. Aqueous solutions of iron(II) sulfate and barium nitrate react to give a barium sulfate precipitate and aqueous iron(II) nitrate.

Express your answer as a chemical equation. Identify all of the phases in your answer. Enter noreaction if there is no reaction.

Answers

1- The original equation of the reaction is :
CrI3 + NaOH → Cr(OH)3 + NaI 
but this is not a balanced equation so we have to balance it :
-first, we have 3 I atoms on the left side and 1  I atom on the right side 
so to makes the no.of atoms on both sides equal we put 3NaI instead of NaI
CrI3 + NaOH → Cr(OH)3 + 3NaI
- then no.of Na atoms on the left side is 1 and on the right side is 3 so, we put 3NaOH instead of NaOH
CrI3 + 3NaOH → Cr(OH)3 + 3NaI
now we have :
Cr atoms = 1 on both sides
I atoms = 3 on both sides
Na atoms = 3 on both sides
O&H atoms = 3 on both sides
So the final balanced equation of our reaction is:
CrI3(aq) + 3NaOH(aq) → Cr(OH)3(s) + 3NaI(aq)

2 - the chemical equation of the second reaction is :
FeSO4 + Ba(NO3)2 → BaSO4 + Fe(NO3)2
let's see if it is the balanced equation or not?
we have:
no of Fe atom on both sides = 1
no of (SO4) atom on both sides are equal
 no of Ba atom on both sides = 1
no of (NO3) group on both sides= 2 
so this is our balanced equation, so the final equation for this reaction is:
FeSO4(aq) + Ba(NO3)2(aq) →BaSO4(s) + Fe(NO3)2(aq)

What are the 2 main factors that affect how quickly a coastline erodes?

Answers

How strong the tides are and the type of material the water is hitting.

How many pairs of homologous chromosomes are found in human body cells

Answers

There are 22 pairs of homologous chromosomes are found in human body cells.

Coal, oil, and natural gas A.
are renewable natural resources.

B.
are in very short supply for consumers.

C.
release carbon dioxide when they are burned.

D.
are clean fuels that contribute little to pollution.

Answers

Coal, oil, and natural gas C) release carbon dioxide when they are burned. They are non-renewable resources, but they are in large supply to consumers, and they are also NOT clean fuels and contribute greatly to pollution. 

answer- release carbon dioxide when burned

coal, oil, and natural gas release carbon dioxide when they are burned and definitely contribute to air pollution.
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