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3 years ago

Examining the figure, how many orders of magnitude larger is a person than a bacterial cell?

1 answer:

4 0

This question is repeated. I will copy the same answer provided by myself.

Well you did not show the figure, but I can show you how to do it.

Suppose the person is 6 feet tall and the bacteria cell is 1 micrometer in length.

So, put both magnitudes in the same units. I will use meter.

Person: 6 feet * 0.3048 m / foot = 1.8288 m, which in orders of magnitud is about 2 m

Bacteria cell: 1 micrometer * 1 m / 1,000,000 micrometer = 1 * 10 ^ -6 m.

Now divide: 2m / 10^ -6 m = 2,000,000

So a person is about 2 million times larger than a bacteria cell.

If the numbers in your figure are different you can use the same method to get a new result according to your figure.

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Balance the following equation: * 1, 1, 1 1, 3, 1 2, 3, 2 1, 3, 2

alexira [117]

1,3,2

The coefficient multiplied by the subscript will give you how many atoms of the element there are.

So, if we plug in 1,3,2
There will be 2 Nitrogen and 6 Hydrogen in the reactants side of the equation. To balance this on the other side, we must put a 2 in order to get 2 Nitrogen and 6 Hydrogen again.

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3 years ago

Would you classify the atoms in the table as pure substances?

ivann1987 [24]

Answer:

Yes

Explanation:

Atoms are generally classified as pure substances. A pure substance has the following properties:

All parts are the same throughout i.e. homogeneous
They have definite composition
The cannot easily be broken down into simpler substances by physical means.
Separation by physical methods is not easy.
They have unique sets of physical properties.

Elements and compounds are generally classified as pure substances. Since atoms are the building blocks of pure substances, they can be classified as one.

3 0

3 years ago

1 calorie is equal to ______ Joules.

leonid [27]

1 calorie is equal to 4.184 Joules.

7 0

3 years ago

Read 2 more answers

16) How many grams are in 1.2 x 1024 molecules of CO? a. 28 b. 6.02 c. 56 d. 1.2

EastWind [94]

Answer:

c. 56

Explanation:

Convert molecules --> moles --> grams

1.2 x 1024 molecules CO * 1 mol/6.022 x 1023 molecules * 28.01 g/1 mol = 55.8153438

Rounded is 56

Let me know if you need further explanation!!

3 0

3 years ago

PH is a logarithmic scale used to indicate the hydrogen ion concentration, [H+], of a solution: pH=−log[H+] Due to the autoioniz

ruslelena [56]

Answer:

A) pH = 2.42
B) pH = 12.00

Explanation:

The dissolution of HCl is HCl → H⁺ + Cl⁻

To solve part A) we need to calculate the concentration of H⁺, to do that we need the moles of H⁺ and the volume.

The problem gives us V=2.5 L, and the moles can be calculated using the molecular weight of HCl, 36.46 g/mol:

$0.35g_{HCl}*\frac{1mol_{HCl}}{36.46g_{HCl}} *\frac{1molH^{+}}{1mol HCl}$ = 9.60*10⁻³ mol H⁺

So the concentration of H⁺ is

[H⁺] = 9.60*10⁻³ mol / 2.5 L = 3.84 * 10⁻³ M

pH = -log [H⁺] = -log (3.84 * 10⁻³) = 2.42

The dissolution of NaOH is NaOH → Na⁺ + OH⁻
Now we calculate [OH⁻], we already know that V = 2.0 L, and a similar process is used to calculate the moles of OH⁻, keeping in mind the molecular weight of NaOH, 40 g/mol:

$0.80g_{NaOH}*\frac{1mol_{NaOH}}{40g_{NaOH}} *\frac{1molOH^{-}}{1mol NaOH}$ = 0.02 mol OH⁻

[OH⁻] = 0.02 mol / 2.0 L = 0.01

pOH = -log [OH⁻] = -log (0.01) = 2.00

With the pOH, we can calculate the pH:

pH + pOH = 14.00

pH + 2.00 = 14.00

pH = 12.00

5 0

3 years ago