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3 years ago

For which of the following can the composition vary?

Chemistry

2 answers:

Mice21 [21]3 years ago

6 0

Answer:

Option a. both homogeneous and heterogeneous mixture.

Explanation:

This can be explained as a mixture is the combination of more than one substances mixed together while retaining their identities or chemical properties.

Homogeneous mixtures in which the components are mixed in the same amounts or proportion, i.e., it has uniformity in it.

Heterogeneous mixtures in which the constituents are not mixed in uniform proportion and are separable.
Pure elements are those which have the a stable isotope or the atomic number of which are same.
Thus the composition can only vary in homogeneous and heterogeneous mixtures.

Margarita [4]3 years ago

5 0

Answer: Option (a) is the correct answer.

Explanation:

A homogeneous mixture is defined as a mixture that contains evenly distributed solute particles into the solvent.

For example, NaCl dissolved in water is a homogeneous solution.

On the other hand, a solution in which solute particles are not evenly distributed into the solvent is known as a heterogeneous mixture.

For example, when sand is added to water then it forms a heterogeneous solution.

Thus, we can conclude that for both homogeneous and heterogeneous mixtures the composition vary.

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If you drop.the soap in the shower is It still dirty

Illusion [34]

No it's not still dirty

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3 years ago

At 3pm a dry-bulb thermometer reading is 66F the wet-bulb reading is 66F what is the relative humidity explain? Plzzzz help <

BARSIC [14]

Answer:

100 %

Explanation:

<em>Relative humidity</em> (RH) is the amount of water vapour in the air compared to the maximum amount it can hold, expressed as a percentage.

RH is measured by a device that has wet- and dry-bulb thermometers.

If the air is unsaturated, water will evaporate from the wet bulb and cool it. The wet-bulb temperature will be less than that of the dry bulb.

If the wet-bulb temperature is the same as the dry-bulb temperature, it means that water cannot evaporate from the wet bulb.

The atmosphere already holds as much water as it possibly can, so the relative humidity is 100 %.

5 0

4 years ago

Why is there no gas pressure in a vacuum?

kramer

no gas pressure in a vacuum - like space

nothing to 'contain' the gas

we have air pressure because of gravity -
air is like waves over the earth - i.e. high and low pressure
high means a lot of air
low means a little and a hurricane or stormy weather is imminent

all the best

4 0

3 years ago

#15 fill in the following table regarding ions

Natasha_Volkova [10]

Answer:

$P^{3-}$ Anion Gained 3 18

$Sr^{2+}$ Cation Lost 2 36

$Fe^{3+}$ Cation Lost 3 23

Explanation:

Looking at the ionic notation, the negative symbol (-) indicates that there are more electrons than protons and the positive symbol (+) indicates that there are more protons than electrons.

The number tells you how many was gained or lost.

To determine how many electrons are left, you base this off how many protons there are. The number of protons in an atom is expressed by the atomic number. In a stable atom, you have an equal number of protons and electrons.

Ions occur when electrons are gained or lost.

A cation is positively charged because it LOST an electron. Since there are more protons than electrons, the charge would be positive.

An anion is negatively charged because it gained an electron. Since there are more electrons than protons, the charge would be negative.

Using the explanation above, you can see how the answers were obtained. As for the last column, just use basic math to do this.

The atomic number of Phosphorus (P) is 15, so this means that there are 15 protons. Since it gained 3 electrons, just add 3 to 15:

15 + 3 = 18

Sr has an atomic number 38. Since it lost 2 electrons, just subtract 2 from the atomic number.

38-2 = 36

Fe has an atomic number 26. It lost 3 electrons, so we subtract again.

26-3 = 23

7 0

3 years ago

Define a physical change

Arte-miy333 [17]

Answer: A physical change is a change that can be undone.

Explanation: An example of this is mixing red blocks, green blocks, and blue blocks. You can easily separate them.

6 0

3 years ago

Read 2 more answers