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2 years ago

PLEASE HELP!!!

Chemistry

2 answers:

umka21 [38]2 years ago

7 0

Answer:

the answer is A

Explanation:

physical changes does not change the property of matter.

Serhud [2]2 years ago

5 0

Answer: A

Explanation:

A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance.

According to this statement the option A that is, melting point is a physical property of matter because when a substance melts, it changes from a solid to a liquid but it still the same substance explains a specific character of a physical property

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Elabore el balance de la ecuación por oxido reducción enumerando cada paso

Rasek [7]

Answer:

${ \rm{5CaC _{2}O _{4(aq)}+ 2KMnO _{4(aq)} + 8H _{2} SO _{4(aq)} → 5CaSO _{4(s)}+ 2Mn SO _{4(aq)}+ K _{2} SO _{4(s)} + 10CO _{2(g)} + 8H _{2} O _{l} }}$

Explanation:

This is a redox reaction formed by combining two half equations.

Check the image above, sorry if my handwriting is poor :(

8 0

2 years ago

You use 10.0 mL of solution A, 10.0 mL of solution B, and 70.0 mL of water for your first mixture. What is the initial concentra

Katena32 [7]

Complete Question

The complete question is shown on the first uploaded image

Answer:

The initial concentration is $C_f = 0.0022 \ M$

Explanation:

From the question we are told that

The volume of solution A is $V_i = 10.0 mL$

The concentration of A is $C_i = 0.0200 \ M$

The volume of solution B is $V_B = 10.0mL$

The volume of water is $V_{w } = 70.0 mL$

Generally the law of dilution is mathematically represented as

$C_i * V_i = C_f * V_f$

Where $C_f$ is the concentration of the mixture

$V_f$ is the volume of the mixture which is mathematically evaluated as

$V_f = 10 + 10 + 70$

$V_f = 90mL$

$C_f = \frac{C_i * V_i}{ V_f}$

substituting values

$C_f = \frac{0.0200 * 10 }{90}$

$C_f = 0.0022 \ M$

Note the mixture obtained is $KIO_3$

7 0

3 years ago

Which describes the role of oxygen in photosynthesis?

Basile [38]

Photosynthesis is the process utilized in the chloroplasts of plant cells, where carbon dioxide and water undergo a chemical process with radiant energy, usually from the sun. The resulting products are energy stored in the form of a glucose molecule, and oxygen, which is given off as a waste product.

5 0

3 years ago

Read 2 more answers

One of the advantages of nylon over rayon is that nylon:

daser333 [38]

- is a natural fibre
- has low elasticity
- is wrinkle free.

3 0

2 years ago

What specifically determines how much energy is available in a molecular

HACTEHA [7]

C The number and types of bonds within the molecule.

Explanation:

In a molecule, the number and types of bonds present determines the amount of available energy therein.

When bonds are broken or formed, energy is usually released.

Elements combine with one another in order to attain stability in this state.
Through this process, they form bonds by attraction.
Where atoms exchange their valence electrons by losing or gaining it, electrovalent bonds form.
In covalent molecules, electrons are usually shared between atoms.
An attraction result from this type of interaction.
The bond formed stores energy in the process.
When bonds are broken, energy is usually released. The energy accrues when the bond was being formed.
In molecules, we have covalent bond.

Learn more:

Bond brainly.com/question/7213980

Covalent bonds brainly.com/question/5258547

#learnwithBrainly

4 0

3 years ago