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3 years ago

Which is an example of a chemical reaction

1 answer:

7 0

Answer:iron and oxygen combining to make rust. vinegar and baking soda combining to make sodium acetate, carbon dioxide and water

Explanation:

You might be interested in

How many grams of NaCI per kilogram of water are present in a 2.7 molal aqueous solution

navik [9.2K]

Answer:

157.79 g

Explanation:

The definition of molality is:

molality = moles of solute / kilogram of solvent

This means that in a 2.7 molal solution, there are 2.7 moles of NaCl per kilogram of water.

So now we convert those 2.7 moles of NaCl to grams, using its molar mass:

2.7 mol * 58.44 g/mol = 157.79 g

5 0

3 years ago

NEED HELP FAST!!!!!!!!!!!!

erma4kov [3.2K]

Covalent for the first one

8 0

3 years ago

Calculate the mass of chromium metal produced when 425.0mL of 0.25M chromium(ll) nitrate reacts with a strip of zinc that remain

Reil [10]

The balanced chemical equation for the production of chromium metal from the reaction of chromium(ll) nitrate reacts with a strip of zinc is:

3 Zn + 2 Cr(NO₃)₃ → 2 Cr + 3 Zn(NO₃)₂

This is a redox reaction, which is a chemical reaction in which one or more electrons are transferred between the reagents, causing a change in their oxidation states. In the proposed reaction, Cr oxidation state goes from +3 to 0, becoming metallic chromium, while Zn goes from being Zn⁰ to Zn²⁺.

The mass of chromium metal produced in the above reaction will be,

425.0 mL x $\frac{1 L}{1000 mL}$ x $\frac{0.25 mol Cr(NO_{3})_{3} }{1 L}$ x $\frac{2 mol Cr }{2 mol Cr(NO_{3})_{3} }$ x $\frac{51.9961 g Cr}{1 mol Cr}$ = 5.52 g

So, the mass of chromium metal produced when 425.0mL of 0.25M chromium(ll) nitrate reacts with a strip of zinc that remains in excess is 5.52 g of Cr.

6 0

3 years ago

Make a good chain with arrows include these organisms white shark,bacteria,kelp,sun,sea urchin,otter

MakcuM [25]

Sun to kelp

kelp to sea urchin

sea urchin to otter

otter to shark

kelp,sea urchin,otter,shark to bacteria

bacteria back to kelp

8 0

3 years ago

Help i give more point this time

dmitriy555 [2]

Answer:

It's a type of chemical bond that emerges because of electrostatic force between electrons and positive metal charges.

Explanation:

I don't know if this is what you are looking for but i don't mind if you copy it.

3 0

3 years ago