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4 years ago

What is the correct answer?

Chemistry

2 answers:

miss Akunina [59]4 years ago

7 0

Answer:

The answer is the second option

Explanation:

I'd appreciate brainliest :)

Nina [5.8K]4 years ago

4 0

Answer:

The answer is the second one, the first person who answered is correct

Explanation:

You might be interested in

Which best explains why the auricle is bent and folded?

andrey2020 [161]

Answer:

to increase the surface area

Explanation:

dk not that sure but hope it helps

4 0

3 years ago

Which crust layer is the densest?

ladessa [460]

Answer:

continenetal crust

Explanation:

Magma Page 2 the densest type of crust (3.0 g/cm) and is made up of a metamorphic rock called basalt. Continental crust makes up the continents and rests on top of oceanic crust. Continental crust consists of less dense rock such as granite.

7 0

3 years ago

Directions: Answer the following questions in complete sentences. a. Describe four properties of acids that you learned in this

sladkih [1.3K]

Answer:

see below

Explanation:

a. Describe four properties of acids that you learned in this lesson.

1. Acids taste sour

For instance, taste some lemon juice

2. Acids are corrosive

Acids in contact with organic tissue or metals attack and, eventually, can destroy them. For instance chloric adis and sulfuric acid. Acids burn the skin.

3. Acids react with metals releasing hydrogen gas

For instance:

$2HCl(aq)+2Na(s)\rightarrow 2NaCl(aq)+H_2(g)\uparrow$

4. The pH of acids is below 7.

pH is the negative logarithm of the hydrodium concentration. HIgh concentrations of hydronum yield low pH: For instance:

$[H_3O]=2.0M \impliespH=-log\dfrac{1}{[H_3O^+]}=-log\dfrac{1}{2}=0.3$

5. Acids conduct electricity:

Acids ionize in water, producing hydronium ions. The ions carry charge. The motion or flow of charge is electric current.

b. Describe four of the properties of bases that you learned in this lesson.

1. Bases taste bitter

For instance, taste some soap

2. Bases are caustic and corrosive

Bases also damage organic tissue and attack metals. Thus they are corrosive such as acids. But strong bases are also named caustic. They cause damage similar to burns but in a different way.

3. The pH of bases is above 7.

pOH is the negative logarithm of OH⁻ ion. And pH + pOH = 14

$[OH^-]=1.0\impliespOH=-log(1/1.0)=-log(0.1)=1\\ \\ pH=14-pOH\\\\pH=13$

4. Bases conduct electricty.

Bases ionize in water releasing OH⁻ which carry charge, the flow of charge is current.

c. What are the products produced when an acid and base react together?

Acids and bases react together neutralizing each other, producing salt and water.

For instance:

$HCl+NaOH\rightarrow NaCl(salt)+H_2O(water)\\\\\\HNO_3+NaOH\rightarrow NaNO_3(salt)+H_2O(water)$

d. Examples of acids and bases. Be sure to check in your fridge, medicine cabinet, and in the cleaning supplies.

From fridge (or the food pantry):

Tomato juice: acid
Lemon juice: acid
Orange juice: acid

soda beverages: acid
vinegard: acid

baking soda: base

From medicine cabinet:

aspirin: acid
ibuprofen: acid

Cleaning supplies:

muriatic acid: acid
soap: base
bleach: base
household ammonia: base
lye: base

e. Names or formulas of acids and bases they may contain.

Tomato juice, lemon juice, and orange juice contain citric acid: C₆H₈O₇

Baking soda is sodium bicarbonate: NaHCO₃

Vinegar is diluted acetic acid: CH₃COOH

Soda beverages: contain carbon dioxide CO₂, and some may contain phosphoric acid H₃PO₄

Muriatic acid is diluted hydrochloric acid: HCl

aspiring is actyilsalicylic acid: C₉H8O₄

ibufrofen is isobutylphenylpropionic acid.

soap: chemically they are fatty acids metal salts.

bleach is sodium hypochlorite: ClOH.

Lye is sodium hyroxide: NaOH

Hosehold ammonia: NH₄OH

f. Find at least five acids and five bases for your list, making sure that there are some items on your list that were not mentioned in the lesson. Whenever possible, list the product/item and the formula or name of the acid or base.

Acids:

citric acid: C₆H₈O₇

soda beverages: carbon dioxide, CO₂
vinegard: acetic acid: CH₃COOH
aspirin: acetylsalicylic acid
ibuprofen: isobutylphenylpropionic acid
muriatic acid: HCl

Bases:

baking soda: sodium bicarbonate: NaHCO₃
soap: fatty acid metal salts.

bleach: sodium hypochlorite: HClO
household ammonia: NH₄OH
lye: sodium hydroxide: NaOH

7 0

4 years ago

A flask that weighs 450 g is filled with 145 ml of benzene. The weight of the flask and benzene is found to be 754 g. From this

vaieri [72.5K]

Answer:

Density, $d=2.09\ g/cm^3$

Explanation:

Given that,

Mass of a flask is 450 g

Volume of benzene added to the flask is 145 mL or 145 cm³

The weight of the flask and benzene is found to be 754 g.

We need to find the density of the benzene.

Weight of benzene added = total weight of flask and benzene-mass of flask

m = 754 g - 450 g

m = 304 g

Density = mass/volume

So,

$d=\dfrac{304\ g}{145\ cm^3}\\\\d=2.09\ g/cm^3$

So, the density of the benzene is $2.09\ g/cm^3$ .

7 0

3 years ago

Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the

Gemiola [76]

Answer:

(1) Nonbonding electron pairs are present on the F in the molecule HF. True

(2) The two atoms involved in a multiple covalent bond must always be atoms of the same element. False

(3) A molecule of hydrogen peroxide contains the same number of atoms as a molecule of sulfur trioxide does. True

Two of the three statements are true.

Explanation:

Non bonding electrons are also known as lone pairs. They are electron pairs present on an atom but are not involved in chemical bonding. They are usually localized on the atom of one of the bonding elements. In HF, there are three nonbonding electrons localized on the fluorine atom that do not participate in chemical bonding.

When multiple bonds are formed between atoms, they must not be atoms of the same element, for instance carbon and nitrogen forms multiple covalent bonds in chemical moieties such as they cyanide ion.

A molecule of hydrogen peroxide (H2O2) contains four atoms just as a molecule of sulphur trioxide(SO3) does.

3 0

4 years ago