Please help me with this chemistry

Answer:   The iron will sink and the sulfu will float

Explanation:  The iron/sulfu mixture only mixes the two elements.  Unless one ignites them, they will remain elements and can be separated based on the difference in their densities.

Answer:

1. is 50...

75/1.5 = 50

2. is 600...

300/5 is 600

3.

Part A: 45 minutes= 0.75 hours

Part B: 5.3

Explanation:

Don't agree? The calculator says other wise....

i checked it its correct.

Answer:

For the distance range 50 to 500 km, the S-waves travel about 3.45 km/s and the P-waves around 8 km/s.

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Answer:

For the distance range 50 to 500 km, the S-waves travel about 3.45 km/s and the P-waves around 8 km/s.

Answer:

Chemical change

Explanation:

Answer:

1. The compound 2NaCl consists of:

» B. 1 atom of chlorine element.

» D. 1 atom of sodium element.

2. The valency of iron in iron (III) sulphate is:

» A. 3 [ valency of only iron ]

» B. 2 [ valency of only sulphate ion ]

3.The systematic name of the compound CuSO4:

» B. Copper (II) sulphate

Explanation:

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Answer:

1) A.

2) A.

3) A.

Answer:

Energy . ......

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The characteristic of science that is missing from this experiment is that "the results are not reliable because the airplanes were only tested one time".

In conclusion, the correct option is D.

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Answer:

D

Explanation:

Answer:

Solids, Gasses, Liquids

Explanation:

Solids are rigid structures that have a definite share and volume.

Gasses will continue to spread indefinitely until pressure prevents further spreading.

Liquids have a volume but take the shape of the container they are in.  

Answer:

Explanation:

water

H. 2. O is the chemical formula for water, meaning that each of its molecules contains one oxygen and two hydrogen atoms

Answer: Rubber source, temperature, thinkness, thread design, driving pattenrs, weather, etc.

Explanation: There are many variables. Here are a few I would include in a tire lifetime study:

1. Type of rubber, including source

2. Thickness of tire

3. Design of tire thread

4. Life as a function of average speed and road surface

5. Expected outside temperature and wet conditions

6. Driving conditions of speed and both acceleration and deceleration parameters (e.g., tire life when slamming on the brakes or accelerating quickly)

Answer:

Mass is a Physical quantity

Explanation:

It is a fundamental physical quantity because it cannot be derived from other physical quantities.

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.

.

Hope it helps

Answer:

A, C, and E. I hope you have a good day.

Explanation:

Answer:

1, 3, and 5

Explanation:

Answer:

8

Explanation:

Electronic configuration of Calcium = 2, 8, 8, 2

M shell = 3rd energy level

Maximum number of shells in m shell is 8

Explanation:

A single-replacement reaction replaces one element for another in a compound.

A double-replacement reaction exchanges the cations (or the anions) of two ionic compounds.

A precipitation reaction is a double-replacement reaction in which one product is a solid precipitate.

Solubility rules are used to predict whether some double-replacement reactions will occur.

Answer:

The molar mass of a substance is calculated as the mass of a given chemical compound or substance, which is then divided by the amount of the substance. The mass is calculated in grams and the amount of the substance is calculated in mol. Thus, the standard unit for molar mass is g/mol.

Explanation:

According to the given question, the reaction between iron chloride and sodium carbonate will be given as:  

[tex]\text {3Na_{2}CO_{3}\text} \;\[+\] \;\text{ 2FeCl_{3} \text}\; \rightarrow\; \text {6NaCl}\; \[+\] \;\text { Fe_{2} (CO_3)_{3} \text}[/tex]

Now, to calculate the mass of iron carbonate formed in the above chemical reaction, it will be given as:

[tex]{ \text Moles\;of}\text \;\text {FeCl_{3} \text} \[=\dfrac{0.15 \;\text {moles} \times 0.015\; \text L}{1.0 { \;\text L}\text}[/tex]

                          [tex]=\;0.00225\; \text {moles}\text[/tex]

Similarly, for sodium carbonate

[tex]\text Moles\; of\; Na_{2}CO_{3}}\te \[=\]\dfrac{0.15 \;\text {moles} \times 0.020\; \text L}{1.0 { \;\text L}\text}\\[/tex]

                             [tex]\[=\]\;0.0003\; {\text moles \text}[/tex]

Limiting reactant is [tex]\text {FeCl_{3} \text}[/tex]

Now, calculating iron chloride mass:

[tex]=\dfrac{0.00225 \times 1\;\text{moles}\;\text{Fe}_2 {(\text{CO}_3)}}{2\;\rm{moles\;of\;}Fecl_3}[/tex]

[tex]=0.001125 \;\text {moles }[/tex]

Now, molar mass of the [tex]\text{Fe}_{2}\text{CO}_{3}[/tex]  will be  [tex]=291.71679\;\text{g/ mol}[/tex]

[tex]\begin{aligned}\text{Mass}&=\frac{\text{Moles}}{\text{Molar mass}}\\\\&=\frac{0.001125\;\text{moles}}{291.71679\; \text{g/mol}} \\\\&=3.85648\times10^{-6} \end{aligned}[/tex]

Answer:

technology scientific methods

Answer:

[tex]⚪ \: { \sf{law}}[/tex]

Answer:

Increases, higher

Explanation:

Remember that the formula for Density is D=mass/volume.

If volume remains the same, as mass increases the density will also increase as the numerator of this math problem increases while the denominator remains the same.

(a) At constant pressure and volume, the density of a gas increases as the molar mass increases.

(b) A gas made of heavier particles will have a greater density than a gas composed of lighter particles under the same conditions of temperature and pressure.

The relationship between density and molar mass is given in the following equations;

PV = nRT

PV = (m/M) RT

PV = (ρV/M)RT

P = (ρ/M)RT

P = (ρRT)/M

PM = ρRT

where;

Thus, we can conclude that, at constant pressure and volume, the density of a gas increases as the molar mass increases.

A gas made of heavier particles will have a greater density than a gas composed of lighter particles under the same conditions of temperature and pressure.

Learn more about density of gases here: https://brainly.com/question/18992505

Answer:

Once ignited, a ribbon of magnesium metal burns freely in air to form solid magnesium oxide in the form of a white powder. The reaction is plainly spontaneous even though ΔS is negative.

Answer: its blank???

Explanation:

Answer:

In chemistry, an element is a pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei. Unlike chemical compounds, chemical elements cannot be broken down into simpler substances by chemical means. Wikipedia

Answer: mass is the amount of matter in one object or substance

Explanation:

Answer:

The fact that the green ink separated from the rubbing alcohol proves that it is indeed a mixture.

Answer:

Cocoa butter, the fat in chocolate, can crystallize in any one of 6 different forms (polymorphs, as they are called). Unfortunately, only one of these, the beta crystal (or Form V), hardens into the firm, shiny chocolate that cooks want. Form VI is also a stable hard crystal, but only small amounts of it form from the good beta (Form V) crystals upon lengthy standing. When you buy commercial chocolate it is in the form of beta crystals.

When you melt chocolate and get it above 94° F, you melt these much desired beta crystals and other types of crystals can set up. If you simply let melted chocolate cool, it will set up in a dull, soft, splotchy, disgusting-looking form. Even the taste is different. Fine chocolate has a snap when you break it and a totally different mouthfeel from the other cocoa butter forms.

Answer:

When you melt chocolate and get it above 94° F, you melt these much desired beta crystals and other types of crystals can set up. If you simply let melted chocolate cool, it will set up in a dull, soft, splotchy, disgusting-looking form. Even the taste is different. Fine chocolate has a snap when you break it and a totally different mouthfeel from the other cocoa butter forms.

Explanation:

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Explanation:

1 grams Ammonia to mol = 0.05872 mol

mass of ammonia = 2.75÷ 0.05872

mass of ammonia=46.8324250681 gm

Answer:

[tex]\boxed {\boxed {\sf 46.8 \ g \ NH_3}}[/tex]

Explanation:

We are asked to calculate the mass of 2.75 moles of ammonia.

We convert moles to grams using the molar mass or the mass of 1 mole of a substance. These values are equivalent to the atomic masses on the Periodic Table, but the units are grams per mole instead of atomic mass units.

Look up the individual elements in the compound of ammonia: NH₃

Notice that there is a subscript of 3 after H in the chemical formula. There are 3 moles of hydrogen in 1 mole of ammonia. We must multiply hydrogen's molar mass by 3 before adding nitrogen's molar mass.

We convert using dimensional analysis. First, set up a ratio using the molar mass.

[tex]\frac {17.031 \ g \ NH_3}{ 1 \ mol \ NH_3}[/tex]

We are converting 2.75 moles of ammonia to grams, so we multiply the ratio by this value.

[tex]2.75 \ mol \ NH_3 * \frac {17.031 \ g \ NH_3}{ 1 \ mol \ NH_3}[/tex]

The units of moles of ammonia cancel.

[tex]2.75 * \frac {17.031 \ g \ NH_3}{ 1}[/tex]

[tex]46.83525 \ g \ NH_3[/tex]

The original measurement of moles (2.75) has 3 significant figures, so our answer must have the same. For the number we calculated, that is the tenth place. The 3 in the hundredth place tells us to leave the 8 in the tenth place.

[tex]46.8 \ g \ NH_3[/tex]

There are approximately 46.8 grams of ammonia in 2.75 moles of ammonia.

Answer:

freezing

Explanation:

hope it is helpful

Answer:

freezing. b.

Explanation:

Answer:

i think correct

Explanation:

i am not sure but i hope it will help you

Answer:

Iron, as well as iron alloys, rusts because of a chemical reaction known as oxidation. When iron is exposed to moisture or oxygen, oxidation occurs. During this chemical reaction, iron is converted into iron oxide. ... Both oxygen and moisture are catalysts for rusting.

Answer:

Iron rusts because of of a chemical reaction known as oxidation. During the chemical reaction iron is converted to iron oxide, if it is left unaddressed, the iron oxide will spread, thereby jeopardizing the physical integrity of the iron.