Which is correct?
a
Electrons in a p sublevel can shield the s electrons that are in the same
principal energy level.
b
Electrons in an s sublevel can shield the p electrons that are in the same
principal energy level.
с
Both a and b are true.
d
Neither a nor b are true.

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:

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:

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:

the elements are listed in order of increasing atomic number. The atomic number is the number of protons in the nucleus of an atom.In a periodic table arranged in order of increasing atomic number, elements having similar chemical properties naturally line up in the same column.

The elements on the periodic table are arranged on the basis of highlighting similarities between elements. Thus, the correct option for this question is A.

The elements on the periodic table are basically arranged on the basis of increasing their atomic number. These atomic number is represented by the number of protons in the nucleus of an element.

According to the question, the elements possessing identical chemical properties are arranged in the same group. For example, group 17 is known as the halogen group. Among this group, the elements bear one electron short to fulfill their octet.

The whole periodic table comprises of 18 groups and 7 periods.

Therefore, the elements on the periodic table are arranged on the basis of highlighting similarities between elements. Thus, the correct option for this question is A.

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Answer:

+27 66 514 3800

Explanation:

Use the edit icon to pin, add or delete clips.

Answer:

1. The graph is showing the monthly rainfall between April to July.

2. The month is on the X axis.

3. The inches of the monthly rainfall is on the Y axis.

Answer:

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

Explanation:

Answer:

1, 3, and 5

Explanation:

Answer:

i think correct

Explanation:

i am not sure but i hope it will help you

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:

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:

Chemical change

Explanation:

Answer:

0.162 mol

Explanation:

n=m/M

M= 20*3 + 15*2 + 8*4*2

M=154 g/mol

n=25g/154g/mol

n=0.162 mol

The number of moles in 25 grams of calcium phosphate is 0.162 mol.

Mole is a SI unit that is used to measure the quantity of any substance in a specific amount. To calculate the moles, we will divide the mass of the substance by the molar mass of that substance.

n = m/M

Calcium phosphate is a chemical compound that contains calcium and phosphorus or phosphoric acid, and it is used to treat the low calcium in the body and thyroid and parathyroid.

The molar mass of calcium sulfate is 154 g/mol

The mass of calcium sulfate is 25 grams

Putting the value in the equation

n = m/M

n = 25g / 154 g/mol = 0.162 mol

Thus, the moles of calcium sulfate are 0.162 mol.

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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)

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:  Heterogeneous Catalyst

Explanation:  The word heterogeneous means "different phases" or insoluble in science.  

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:

[tex].[/tex]

Answer:

1) A.

2) A.

3) A.

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.

Answer:

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

Answer:

Energy . ......

Hope this helps you!

Answer:

In his 1805 work, "A New System of Chemical Philosophy," Dalton propounded the tenets of his atomic theory: The chemical elements are made of atoms. The atoms of an element are identical in mass. Atoms of different elements have different masses.

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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:

freezing

Explanation:

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Answer:

freezing. b.

Explanation:

Answer:

407.5 g

Explanation:

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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: its blank???

Explanation:

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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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