CHEMISTRY MIDDLE SCHOOL

Water (H2O) and hydrogen peroxide (H2O2) are both clear liquids. Which description most accurately describes the relationship between water and hydrogen peroxide?A.
They are two different elements.

B.
They are two different compounds that include different elements.

C.
They are two different compounds that include the same elements in different arrangements.

D.
They are two different mixtures that include the same elements in different arrangements.

Answers

Answer 1

Answer:

The answer to this question is C.

Answer 2

Answer:

Answer:

Explanation:

Hydrogen peroxide

Hydrogen peroxide is a chemical compound with the formula H₂O₂. In its pure form, it is a very pale blue liquid, slightly more viscous than water. It is used as an oxidizer, bleaching agent, and antiseptic. Concentrated hydrogen peroxide, or "high-test peroxide", is a reactive oxygen species and has been used as a propellant in rocketry. Its chemistry is dominated by the nature of its unstable peroxide bond.

Chemical formula: H2O2

Density: 1.45 g/cm³

Boiling point: 302.36°F (150.20°C)

Average Molar mass: 34.01 g/mol

Melting point: 31.23°F (-0.43°C)

Legal status: Over-the-counter drug · Not evaluated by FDA

Water

Water is an inorganic, transparent, tasteless, odorless, and nearly colorless chemical substance, which is the main constituent of Earth's hydrosphere and the fluids of all known living organisms. It is vital for all known forms of life, even though it provides no calories or organic nutrients. Its chemical formula is H₂O, meaning that each of its molecules contains one oxygen and two hydrogen atoms, connected by covalent bonds. Two hydrogen atoms are attached to one oxygen atom at an angle of 104.45°.

Boiling point: 212°F (100°C)

Melting point: 32°F (0°C)

Chemical formula: H2O

Average Molar mass: 18.02 g/mol

IUPAC ID: Water

Cited sources

Hydrogen peroxide(wiki)

Water(wiki)

Other

So probably C or D i dont know

Sorry if it is wrong

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How would you measure the pH of a coloured substance such as red ink.why?

Answers

There are 3 possible ways of determining pH.
1. A pH meter, 2. Litmus paper/ pH test strips or 3. Titrations.

1. A pH meter works by sending a small electric current through the solution. An electrical current can only be created if there are free-moving particles such as H+ ions from an acid or OH- ions from a base. The pH meter can determine the pH by how high the conductivity is.

2. Litmus Paper or pH test strips are strips that turn a specific colour under a specific pH. This colour can then be compared to a colour chart which will tell you the pH. The downfall of this method is that the red ink will stain the strip and you will be unable to get an accurate reading.

3. A titration is the best method, if done properly, for determining pH.

During science lab, Jacob mixes together sodium hydroxide (NaOH) and hydrochloric acid (HCl). The two chemicals react to form sodium chloride (NaCl) and water (H2O).Which of the following are reactants in the chemical reaction described above?

Answers

Answer: NaOH and HCl are the reactants for the reaction described.

Explanation:

Reactants of a chemical reaction is defined as the substances which take part in a chemical reaction and undergoes a chemical change. These are written on left side of the arrow.

Products are defined as the substance which are formed at the end of the chemical reaction. These are written on the right side of the arrow.

For the reaction of sodium hydroxide and hydrochloric acid, the equation represents:

$NaOH+HCl\rightarrow NaCl+H_2O$

Here, NaOH and HCl are reactants.

The above reaction is a type of neutralization reaction.

NaOH(sodium hydroxide) and HCl( hydrogen chloride) are reactants.

Which requires the removal of heat, melting or freezing?Is it evaporation? What is it? Why?

Answers

Freezing. If you take away energy from something, (lower its temperature), it will freeze. If you add heat to something, it will melt if it is a solid and evaporate if it is a liquid.

When you add energy to something, the atoms which comprise the substance jiggle and vibrate, meaning that on a large scale, a solid will become a liquid, and a liquid will become a gas.

Freezing, just think about it, the colder it gets the more likely there is going to be snow/ hail/ ice

What happens to the molecules in a gas when it condenses?