All categories

3 years ago

Density is given in ____. a. Pa/cm3 c. g/s2 b. N/m2 d. g/cm3 Please select the best answer from the choices provided A B C D

Chemistry

2 answers:

Ray Of Light [21]3 years ago

7 0

Density is given in Mass/Volume so the answer is D

serg [7]3 years ago

7 0

Indeed Density (d) is in fact given in
$g \div {cm}^{3}$
Answer [D].

Since density (d) is a measurement of a substance's mass per volume, or d = m/v, we can see that units would be in g, kg, etc for mass and mL, L, etc for volume. And then where does
${cm}^{3}$
come from?? Well 1 mL of water occupies a cylindrical space of 1 cubic cm.

You might be interested in

A double replacement reaction can be best described as a reaction in which

ExtremeBDS [4]

<h3>Answer </h3>

Option C= ions are exchanged between two compounds.

<h3>Explanation </h3>

A double displacement reaction, also known as a double replacement reaction or metathesis, is a type of chemical reaction where two compounds react, and the positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products. For example,

Na2S + 2HCl → H2S + 2NaCl

Option D is incorrect because electrons are exchanged between the atoms in oxidation –reduction reactions.

3 0

3 years ago

A mixture of gases with a pressure of 800.0 mm hg contains 60% nitrogen and 40% oxygen by volume. what is the partial pressure o

klasskru [66]

Hello!

<span>We have the following statement data:
</span>
Data:
$P_{Total} = 800 mmHg$
$P\% N_{2} = 60\%$
$P\% O_{2} = 40\%$
$P_{partial} = ? (mmHg)$

<span>As the percentage is the mole fraction multiplied by 100:

</span> $P = X_{ O_{2} }*100$

<span>The mole fraction will be the percentage divided by 100, thus:
</span><span>What is the partial pressure of oxygen in this mixture?
</span>
$X_{ O_{2} } = \frac{P}{100}$
$X_{ O_{2}} = \frac{40}{100}$
$\boxed{X_{ O_{2}} = 0.4}$

<span>To calculate the partial pressure of the oxygen gas, it is enough to use the formula that involves the pressures (total and partial) and the fraction in quantity of matter:
</span>
In relation to $O_{2}$ :

$\frac{P O_{2} }{P_{total}} = X_O_{2}$
$\frac{P O_{2} }{800} = 0.4$
$P_O_{2} = 0.4*800$
$\boxed{\boxed{P_O_{2} = 320\:mmHg}}\end{array}}\qquad\quad\checkmark$
<span>
Answer:
</span><span>b. 320.0 mm hg </span>

7 0

3 years ago

Compare and contrast alpha beta and gamma radiation

Evgen [1.6K]

There are usually 3 topics used to compare types of radiation:

Ionising ability
Penetrative power
Range in air

Ionising ability
Alpha radiation has strong ionising ability, while beta only has moderate ionisation and gamma is very weakly ionising.

Penetrative power
Alpha particles are weakly penetrating, stopped by paper, while beta particles have stronger penetrating ability, stopped by skin and gamma radiation is very strongly penetrating, stopped only by thick layers of lead.

Range in air
Alpha particles- range of only a few centimetres
Beta - range of up to one meter
Gamma- infinite range in air.

Hope this helps:)

8 0

3 years ago

Define velocity and state what it is meant by uniform acceleration

Arlecino [84]

Velocity- It is basically the speed of an object but with a particular direction.

Uniform Acceleration- It is a type of motion in which the velocity of a object changes by an equal amount in every equal period of time.

7 0

3 years ago

Change 0.00765 kL into mL

bagirrra123 [75]

Answer:

7650

Explanation:

formula- multiply the volume value by 1e+6

4 0

3 years ago

Read 2 more answers