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3 years ago

7

Which of the following choices is an example of gathering evidence

1 answer:

-BARSIC- [3]3 years ago

3 0

Answer: Taking measurements

Explanation:

Apex

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A ball is rolling straight across the floor into Bradley kicks it what slow motion is this

aivan3 [116]

Could you clarify the question? It seems you’re trying to say “A ball is rolling straight across the floor until Bradley kicks it. What kind of motion is this”. To answer that, its kinetic energy from the ball rolling, chemical energy is turned into kinetic energy for the kick, and the ball is now given more kinetic energy focused in a different direction.

7 0

4 years ago

g Suppose you are titrating vinegar, which is an acetic acid solution of unknown concentration, with a sodium hydroxide solution

Elza [17]

Answer: The molar concentration of acetic acid in the vinegar is 0.539 M.

Explanation:

The formula used is:

$M_1V_1=M_2V_2$

where,

$M_1$ and $V_1$ are the concentration and volume of base.

$M_2$ and $V_2$ are the concentration and volume of an acid.

Given:

Molar concentration of NaOH = 0.1798 M

Volume of NaOH = 30.01 mL

Volume of acetic acid = 10.0 mL

Now putting all the given values in the above formula, we get:

$M_1V_1=M_2V_2\\\\0.1798M\times 30.01mL=M_2\times 10.0mL\\\\M_2=0.539M$

Thu, the molar concentration of acetic acid in the vinegar is 0.539 M.

4 0

3 years ago

What’s the density of a polypropylene

maria [59]

Answer:

0.92 g/cm³

hope this helps

3 0

3 years ago

Passing an electric current through a sample of water (H2O) can cause the water to decompose into hydrogen gas (H2) and oxygen g

Tema [17]

<u>Answer:</u> The mass of water that must be reacted is 56.28 grams.

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ ....(1)

Given mass of oxygen = 50 g

Molar mass of oxygen = 32.00 g/mol

Putting values in equation 1, we get:

$\text{Moles of oxygen}=\frac{50g}{32g/mol}=1.5625mol$

For the given chemical equation:

$2H_2O\rightarrow 2H_2+O_2$

By Stoichiometry of the reaction:

1 mole of oxygen is produced when 2 moles of water is reacted.

So, 1.5625 moles of oxygen is produced when = $\frac{2}{1}\times 1.5625=3.125mol$ of water is reacted.

To calculate the mass of water, we use equation 1:

Moles of water = 3.125 moles

Molar mass of water = 18.01 g/mol

Putting values in equation 1, we get:

$3.125mol=\frac{\text{Mass of water}}{18.01g/mol}\\\\\text{Mass of water}=56.28g$

Hence, the mass of water that must be reacted is 56.28 grams.

3 0

4 years ago

How many atoms are in 6.3 moles of lead

densk [106]

Answer:

3.79 x 10²⁴atoms

Explanation:

Given parameters:

Number moles of lead = 6.3moles

Unknown:

Number of atoms = ?

Solution:

To solve this problem,

1 mole of a substance contains 6.02 x 10²³ atoms

6.3 mole of Pb will contain 6.3 x 6.02 x 10²³ = 3.79 x 10²⁴atoms

4 0

3 years ago