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katovenus [111]
3 years ago
7

HELP ASAP !!!!!

Chemistry
1 answer:
Anna35 [415]3 years ago
3 0

Answer:

Explanation:

Take a random sample of nuts from the jar.  Let's take two handfuls, after shaking the jar and mixing the nuts thoroughly.  Separate the nuts into almonds and cashews.  Count each pile, then do the following calculation (these numbers are random, for example only).

                <u> Count</u>   <u>Percentage %</u>

Almonds       38        (38)/(87)x100

Cashews      <u> 49</u>         49/87x100

                      87          87/87 = 100%

Ratio of Almonds to Cashews:  <u>38/49</u>

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Answer:

C.Echinoderms have radial symmetry and worms have bilateral symmetry

Explanation:

Echinoderms evolved from animals with bilateral symmetry. The larvae of all echinoderms are bilaterally symmetrical but lost during metamorphosis  developing into radial symmetry adult. Examples of echinoderms are  starfish, sea urchins, sand dollars.

Worms are invertebrate animals having bilateral symmetry. They have a definite anterior (head) end and a posterior (tail) end. Worms have brains that help them detect objects, food,  mates, and predators quickly.

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3 years ago
Chose the statements that are TRUE from the list below Group of answer choices Ions exist alone in nature We add calcium carbona
kompoz [17]

Answer:

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The third option is false.

In the fourth option we consider that it is true since the hydrofluoric acid is a weak acid. Hydrogen fluoride actually does dissolve quite freely in water, but the H 3 O + and F - ions are strongly attracted to each other and form the strongly bonded pair, H 3 O + · F -

Explanation:

The third option is considered false since the salts contain an acid and a basic part, where one works as an anion and the other as a cation against dissolution, that is why they are not one or the other, but both chemical characteristics make up the Salt.

There are more or less soluble salts than others, and in turn there are binary, quaternary, tertiary or simple salts.

Y como para contribuir más a la explicación, es importante recordar el grupo de los acidos se clasifica en dons grandes familias, en acidos debiles y fuertes.

Un alcalde ph mas debiles seran, por más tiempo cercano al valor ph: 7 esten menos acidificacion tendran, y cuanto más lejos de la neutralidad este es su numero de ph mas fuertes seran.

5 0
4 years ago
If a 22.4 L volume of a sample of gas has a density of 0.900 grams/L at 1.00 atm and 0.00°C. Given
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Answer:

Formula Weight of gas sample = 20.1 g/mole => Neon (Ne)

Explanation:

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Density = 0.900 grams/L

R = 0.08206 L·atm/mole·K

T = 0.00°C = 273Kfwt = (0.900g/L)(0.08206L·atm/mole·K )(273K)

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4 0
3 years ago
Which of following reactions shows the formation of a hydronium ion? H+ + H2O H3O+ H2O + CO2 H2CO3 NaOH Na+ + OH− H2O + NH3 OHâˆ
lesantik [10]
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7 0
3 years ago
Read 2 more answers
An inflated balloon contains X air molecules.After some time the volume of the balloon is found to be the half at the same tempe
astra-53 [7]

<u>Answer:</u>

(a): The balloon will contain \frac{X}{2} number of molecules now.

(b): The gas law associated with this is Avogadro's law.

<u>Explanation:</u>

Avogadro's law states that the volume of the gas is directly proportional to the number of moles of the gas at constant pressure and temperature

Mathematically,

V\propto n                   (At constant pressure and temperature)

OR

\frac{V_1}{n_1}=\frac{V_2}{n_2}               .....(1)

where,

V_1\text{ and }n_1 = Initial volume and number of moles

V_2\text{ and }n_2 = Final volume and number of moles

We are given:

V_2=\frac{V_1}{2}

Putting values in equation 1, we get:

\frac{V_1}{n_1}=\frac{V_1}{2\times n_2}\\\\n_2=\frac{n_1}{2}

(a):

If n_1 number of moles of gas contains X number of molecules

So, \frac{n_1}{2} number of moles of gas will contain = \frac{X}{n_1}\times {n_1}{2}=\frac{X}{2} number of molecules

Hence, the balloon will contain \frac{X}{2} number of molecules now.

(b): The law used is Avogadro's law.

8 0
3 years ago
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