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3 years ago

Characteristics of matter that cannot be changed are called

1 answer:

5 0

It is called Mass.

Among the physical characteristics of a matter which includes Weight, Mass, Volume, and Density the only characteristic that does not change is the mass. The mass of an object never change from place to place. All the objects have a mass and that is why there is a weight but it changes depends on the gravity. Mass don't.

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What is the percent by mass of oxygen in carbon dioxide (CO2)? Use mc008-1. Jpg. 27. 29% 57. 12% 72. 71% 79. 99%.

castortr0y [4]

The percent by mass of oxygen in carbon dioxide ( $CO_2$ ) is 72.71%.

<u>Scientific data:</u>

Molar mass of oxygen gas = 32 g/mol.

Molar mass of carbon = 12 g/mol.

To calculate the percent by mass of oxygen in carbon dioxide ( $CO_2$ ):

First of all, we would calculate the molar mass of carbon dioxide ( $CO_2$ );

$CO_2 = 12 +(16\times 2)\\\\CO_2 = 12 +32\\\\CO_2 = 44\;g/mol$

For the percent by mass of oxygen:

$O_2 = \frac{Mass\; of \;O_2}{Mass\; of \;CO_2} \times 100$

Substituting the parameters into the formula, we have;

$O_2 = \frac{32}{44} \times 100\\\\O_2 = 0.7271 \times 100$

Percent mass of oxygen = 72.71%

Read more on percent mass here: brainly.com/question/15182450

5 0

3 years ago

Which of these best explains why a paper clip can float on water ? A.Water has a very high specific heat. B.water molecules at t

Virty [35]

d) water molecules near the surface produce more buoyant force than water molecules within liquid.

hope this helps!

3 0

3 years ago

Read 2 more answers

Which of the following elements would be classified as a nonmetal

Greeley [361]

Sulfur would be classified as a nonmetal.

Sulfur is a very important element on the periodic table of elements. It was originally known as brimstone and was discovered by Antoine Lavoisier in the year of 1789.

8 0

3 years ago

Read 2 more answers

Why is the answer C for this problem?

pshichka [43]

Answer:

$\boxed{\text{(C) X}$_{3}$P$_{2}}$

Explanation:

Step 1. Identify the Group that contains X

We look at the consecutive ionization energies and hunt for a big jump between them

$\begin{array}{crc}n & IE_{n} & IE_{n} - IE_{n-1}\\1 & 730 & \\2 & 1450 & 720\\3 & 7700 & 6250\\4 & 10500 & 2800\\\end{array}$

We see a big jump between n = 2 and n = 3. This indicates that X has two valence electrons.

We can easily remove two electrons, but the third electron requires much more energy. That electron must be in the stable, filled, inner core.

So, X is in Group 2 and P is in Group 15.

Step 2. Identify the Compound

X can lose two valence electrons to reach a stable octet, and P can do the same by gaining three electrons.

We must have 3 X atoms for every 2 P atoms.

The formula of the compound is $\boxed{\text{X}$_{3}$P$_{2}}$}$ .

4 0

3 years ago

A 40.5 g sample of aluminum is cooled 7.5°C. The specific heat capacity of aluminum is

sweet-ann [11.9K]

Q=mc\Delta T
Q= 40.5g x 0.900 J/g degree Celsius x 7.5
Q= 273.4 J.
Even if it is cooled , we use the same temperature as heating it.

3 0

3 years ago