CHEMISTRY HIGH SCHOOL

Which is an example of a chemical change?mixing of poster colors
formation of clouds
metal corroding in salt water
sugar dissolving in water
separating salt from seawater

Answers

Answer 1

Answer: metal corroding in salt water corrosion is a chemical change

Answer 2

Answer:

Answer: C. metal corroding in salt water

Explanation:

Related Questions

Why are atoms always bonded
Which is true about the temperature of a gas?At a higher temperature, the particles have a higher average kinetic energy. At a higher temperature, the volume of the gas is smaller. At a lower temperature, there are more particles in the gas. At a lower temperature, the particles in the gas move faster.
Is zinc coMpund Plz help me
Which of the following molecules has polar bonds but is a nonpolar molecule?a. H₂ b. H₂O c. NH₃ d. NaCl e. CO₂ Can anyone explain this one?
What kind of reaction occurs when a molecule of glucose reacts with oxygen to give carbon dioxide and water?A. an exothermic reactionB. an endothermic reactionC. a synthesis reactionD. an irreversible reaction

The point at which a substance is at complete equilibrium is called? User: a hydrogen bond is a special form of what type of bond

Answers

I don't know what the answer to your first question is. All of my teachers have only called it the equilibrium point. However for your second question, a hydrogen bond is a special type of dipole-dipole attraction. Only oxygen, nitrogen, and fluorine are able to make them when bonded with hydrogen. Hydrogen bonding is what makes water have such a high boiling point considering how light the molecule is.

What turns colour in an acid and base

Answers

Answer:

Chemists use a solution called Universal Indicator to identify acids and bases. ... The Universal Indicator Color Guide shows that Universal Indicator turns red when it is added to a strong acid, it turns purple when it is added to a strong base, and it turns a yellowish-green when it is added to a neutral solution.

Explanation:

Answer:

Phenolphthalein

Explanation:

I Need Help With These.

Answers

You have to use the equation P₁V₁=P₂V₂ for the first 2 questions and V₁/T₁=V₂/T₂ for the third one.

1) Since you have to find the final volume you have to solve the equation above for V₂ to get V₂=P₁V₁/P₂
P₁=1atm
V₁=2.00L
P₂=6x10^4atm
when you plug everything in you should get 3.33x10^-5 L

2) You are again trying to find V₂ so use the equation V₂=P₁V₁/P₂
P₁=1.2atm
V₁=15000L
P₂=250atm
when you plug everything in you should get 72L

3) we are trying to find the final volume so use the equation V₂=V₁T₂/T₁
V₁=2.2L
T₁=14.2°C (convert this into 287.2K since most gas law equations require the use of kelvin)
T₂=38.98°C (tern this to 311.98K for the same reason as above)
when you plug everything in you should get 2.39L

I hope this helps. Let me know in the comments if anything if anything is unclear.

1. The speed limit on most city streets is (25 miles). How many meters per minutehour
is this?
This is a conversion.

Answers

Answer:

$Speed = 670.56 (m)/(min)$

Explanation:

Given

$Speed = (25 mi)/(hr)$

Required

Convert to meters per minutes

$Speed = (25 mi)/(hr)$

Start by converting the speed from miles to meters

$1\ mile = 1609.34\ meters.$

So, we have:

$Speed = (25 * 1609.34\ m)/(hr)$

$Speed = (40233.5\ m)/(hr)$

Next, we convert time from hours to minutes

$1\ hour = 60\ minutes$

So, we have:

$Speed = (40233.5\ m)/(60\ min)$

$Speed = 670.56 (m)/(min)$

Hence, the equivalent of 25 miles per hour is 670.56 meters per minutes

Table salt, NaCl, is an example of an amorphous solid.
TRUE
FALSE

Answers

Answer:

False

Explanation:

Before answering the question, it is important to understand;

An amorphous solid is any noncrystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. Such solids include glass, plastic, and gel. Emphasis on the word noncrystalline.

Table salt on the other hand is an ionic solid made up of Ions of opposite charges (Sodium ion and Chlorine ion) strongly attract each other; those of like charges repel. As a result ions in an ionic compound are arranged in a particular manner.

The ions in NaCl are ordered hence are referred to as crystalline solids and not amorphous.

False, it is an example of an Ionic solid

A 115.0-g sample of oxygen was produced by heating 400.0 g of potassium chlorate. 2KClO3 mc019-1.jpg 2KCI + 3O2 What is the percent yield of oxygen in this chemical reaction?

Answers

The balanced equation that describes the reaction of heatinf potassium chlorate to produce potassium chloride and oxygen is expressed 2KClO3 = 2KCI + 3O2. For a 400 g potassium chloride, using stoichiometry, the mass oxygen produced is 156.67 grams oxygen. The actual product weighed 115.0 grams. Yield is equal to 115/156.67 or 73.74%

Answer:

The percent yield of oxygen in this chemical reaction is 73.71 %.

Explanation:

Experimental yield of oxygen gas = 115.0 g

Theoretical yield:

$2KClO_3rightarrow 2KCI + 3O_2$