Aluminum has a density of 2.70 g/cm 3 . Boron has a density of 2.08 g/cm 3 . Predict the density of gallium. Explain your answer.

6 M is the molarity of the HCl solution with volume 1 liter.

Molarity (M) of solution is define as the number of moles (n) of solute present in per liter (V) of solution, i.e. M = n/V.

Given chemical reaction is:

2HCl + Ca(OH)₂ → CaCl₂ + 2H₂O

Given volume of HCl = 1 L

Given volume of Ca(OH)₂ = 2 L

Molarity of Ca(OH)₂ = 1.50M

Moles of Ca(OH)₂ = 1.50 × 2 = 3 moles

From the stoichiometry of the reaction:

1 mole of Ca(OH)₂ = react with 2 moles of HCl

3 mole of Ca(OH)₂ = react with 2×3=6 moles of HCl

Molarity of HCl will be calculated by using the above given formula as:

M = 6/1 = 6M.

Hence, option (4) is correct i.e. 6 M.

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Answer:

D

Explanation:

trust

[tex]\\ \rm\Rrightarrow pH=-log[H^+][/tex]

[tex]\\ \rm\Rrightarrow pH=-log(2.4\times 10^{-6})[/tex]

[tex]\\ \rm\Rrightarrow pH=-log2.4-log10^{-6}[/tex]

[tex]\\ \rm\Rrightarrow pH=-0.38+6[/tex]

[tex]\\ \rm\Rrightarrow pH=5.62[/tex]

Answer:

The bulk of carbon dioxide is carried chemically combined with the amino acids of hemoglobin as carbaminohemoglobin in the RBCs.

Answer

changing from liquid to gas

Explanation

changing from liquid to gas

Answer 1 :

[tex]\green{\sf{D \: and \: E}}[/tex]

Step-by-step explanation:

As per graph, the highest lines are D and E. They are increasing.

Answer 2:-

[tex]\sf{\blue{B \: and \: C}}[/tex]

Step-by-step Explanation:

It is because the line between B and C is straight, indicating that it is steady.

Answer 3:-

[tex]\sf{\pink{2 \: m/s}}[/tex]

Step-by-step Explanation:

Its because the interval between line CD can be taken as-

[tex]\sf{40-50 = 1 m/s} \\ \sf{50-60 = 2 m/s}[/tex]

Hence, 2 m/s.

Answer 4:

[tex]\sf{\red{A \: and \: E}}[/tex]

Step-by-step Explanation:

We can see from the graph that the change in lines us occurring between initial and final points, i.e., between A and E.

Answer 5:

[tex]\sf{\purple{1m/s}}[/tex]

Step-by-step Explanation:

This is because, we can consider the interval between points D and E as :-

[tex]\sf{60-70=1m/s}[/tex]

Answer:

hydrogen bond exists between nucleotides

Answer:

phosphodiester

Explanation:

Noncovalent hydrogen bonds connect the nucleotides that make up each DNA strand. Individual hydrogen bonds are weaker than covalent bonds like phosphodiester bonds. But they are so numerous that they strongly connect the two DNA polymers.

I hope this helps you

:)

Answer:

Energy is first released then arbsorbed the eventually it dissappears

Explanation:

Answer:

Explanation:

Salt + water gives an adequate conductor. It is not absolutely wonderful like silver, but it will conduct electricity to varying degrees depending on the depth of salt water that the conductor is held at.

I'd say A.

Explanation:

use the diagram above to understand it

Answer:

Humans :)

Explanation:

Humans have killed so many species of wolves, deer, tigers, lions and bears oh my!

In the food chain, we, humans are at the top because of this

Answer:

Oxygen is one of the most abundant elements on Earth. Oxygen accounts for 20.9% of the atmosphere, 45% of the Earth's crust (as oxide minerals) and also accounts for almost all of the mass of water on Earth (89%). It is found in a huge number of natural minerals including sulfates, phosphates, carbonates and oxides.

Explanation:

Hope this helps

Answer:

1.76g of N

Explanation:

5.04g x 1mol/16mol x 2mol/5mol x 14.01g/1mol = 1.76g

Newton's third law

Explanation:

Answer:

6 Energy levels

Explanation:

First Energy Level: 2

Second Energy Level: 8

Third Energy Level: 18

Fourth Energy Level: 25

Fifth Energy Level: 8

Sixth Energy Level: 2

Hope this helps.

25.07grams is the theoretical yield of magnesium hydroxide if the resulting solution has a volume of 2. 82 liters.

Mass of any substance will be calculated from moles as:

n = W/M, where

W = given or required mass

M = molar mass

Given chemical reaction is:

2NaOH + MgCl₂ → Mg(OH)₂ + 2NaCl

From the stoichiometry of the reaction, it is clear that:

2 moles of NaOH = produce 1 mole of Mg(OH)₂

1 mole of NaOH = produce 1/2 mole of Mg(OH)₂

Given concentration of NaOH = 1.35M

Given volume of NaOH = 637mL = 0.637L

Moles of NaOH will be calculated as:

M = n/V

n = 1.35M × 0.637L = 0.859 moles

So, 0.859 moles of NaOH = produce 0.859×1/2 = 0.429 moles of Mg(OH)₂

Now, we convert this moles into grams by using the above formula:

0.429 = W/58.31 g/mole

W = 25.07grams

Hence, 25.07grams is the theoretical yield of magnesium hydroxide.

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The amount of heat required to purify the Al is 25.94 * 10^3 J

The term heat capacity refers to the amount of heat required to raise the temperature of a substance by 1K. The aluminum was heated from 298 K to 933 K then it melted.

The total heat required is;

H = ncdT + nL

H = (1 * 24 * (933 - 298)) + (1 * 10.7 * 10^3)

H = 15.24 * 10^3  J + 10.7 * 10^3 J

H = 25.94 * 10^3 J

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6.15 grams of carbon dioxide is form when 8.94 g of oxygen is completely react.

Mass of any substance will be calculated from moles as :

n = W/M, where

W = required mass

M = molar mass

Given combustion reaction is:

CH₄ + 2O₂ → CO₂ + 2H₂O

Given mass of O₂ = 8.94 g

Molar mass of O₂ = 32.00 g/mole

Moles of O₂ = 8.94 / 32 = 0.279 mole

From the stoichiometry of the reaction, it is clear that:

2 moles of O₂ = produce 1 mole of CO₂

0.279 moles of O₂ = produce 1/2×0.279 = 0.139 moles of CO₂

Molar mass of CO₂ = 44 g/mole

Required mass of CO₂ will be calculated as:

W = n × M

W = 0.139 × 44 = 6.15 grams

Hence, option (2) is correct i.e. 6.15 grams.

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Answer:

Option 2/ B. 6.15 grams on edge.

Explanation:

S/o to the person above me, got it because of them.

Answer: They are the same species and have the same traits.

Explanation: These horses are well, the same species because they are horses.  They have very similar traits.  

Let me know if this is right!

Answer:

1.) Cu(NO₃)₂ + 2 NaOH --> Cu(OH)₂ + 2 NaNO₃

2.) CuO + 2 HCl --> H₂O +  CuCl₂

Explanation:

Both of these reactions are substitution/double displacement reactions. The base reaction looks like this: AX + BY --> AY + BX. In other words, the negative ion of the first molecule bonds to the positive ion of the second molecule, and vice versa.

The products of the first equation are:

Cu(NO₃)₂ + NaOH --> Cu(OH)₂ + NaNO₃

The OH⁻ and the NO₃⁺ are polyatomic ions, meaning they stay together in these types of reactions. When determining the products, make sure to take note of the charges on the ions because subscripts may be necessary to balance them out.

Now you need to balance the coefficients. When balancing equations, begin with an element that is not present in more than one molecule on either side (ex. the oxygen is in two molecules on the reactant side). Keep in mind that the subscripts should be multiplied by the coefficients when determining the number of some elements.

The balanced first equation is:

Cu(NO₃)₂ + 2 NaOH --> Cu(OH)₂ + 2 NaNO₃

The process for the second equation is nearly identical to the first. The balanced second equation is:

CuO + 2 HCl --> H₂O +  CuCl₂

Answer:

initiated the comprehensive discovery and cataloguing of a 'parts list' of most human genes 

Explanation:

Answer:

that's not good

Explanation:

microbes???? not good for a sewage system

Answer:

the pOH of a solution is the negative logarithm of the hydroxide-ion concentration. by this yields a [OH − ] of 1.0 × 10 -10 M. Finally the pOH of the solution equals -log(1.0 × 10 -10 ) = 10.Explanation:

The concentration of hydroxide ion of a solution whose pOH value is equal to 2.86 is 1.38×10⁻³ M.

Concentration of hydroxide ion will be calculated by using the pOH value by using the below equation as:

pOH = -log[OH⁻]

[OH⁻] = [tex]10^{-pOH}[/tex]

Given that value of pOH = 2.86

On putting values we get,

[OH⁻] = [tex]10^{-2.86}[/tex]

[OH⁻] = 0.00138 = 1.38×10⁻³ M

Hence concentration of hydroxide ion is 1.38×10⁻³ M.

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The mass, in metric tons, of carbon in the methane is 1.83 metric tons

From the question, we are to determine the quantity of carbon in the methane

The mass of carbon in the methane can be calculated from

Mass of carbon in the methane = [tex]\frac{Mass\ of\ carbon\ in\ a\ molecule\ of \ methane}{Mass\ of\ a\ molecule\ of \ methane}\times Total\ mass\ of\ the\ methane[/tex]

Mass of carbon in a molecule of methane = 12 g

Mass of a molecule of methane = 16 g

Therefore,

Mass of carbon in the methane = [tex]\frac{12}{16} \times 2.44[/tex]

Mass of carbon in the methane = 1.83 metric tons

Hence, the mass, in metric tons, of carbon in the methane is 1.83 metric tons

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Answer:

C3H8

Explanation:

1 1.5mol

2 0.75mol

3 0.667mol

Questions 1.2

1 16.7mol

2 8.3×10−3mol

Questions 1.3

1 9

2 11

3 12

4 24

5 22

Questions 1.4

1 a) 151.9

b) 162.1

c) 60.0

d) 132.1

e) 388.8

2 a) 0.5mol

b) 2.5mol

c) 0.6mol

d) 2.0mol

e) 0.38mol

3 a) 180.6g

b) 44.46g

Questions 1.5

1 Mr = 277.9 moles of oxygen = 11

2 Mr = 474.3 moles of oxygen = 20

Questions 1.6

1 Cu2S

2 C3H8

3 CaFe2O4

Questions 1.7

1 a) 2H2 + O2 → 2H2O

b) I2 + 3Cl2 → 2ICl3

c) NaOH + Al(OH)3 → NaAlO2 + 2H2O

d) 2H2S + SO2 → 3S + 2H2O

e) 4NH3 + 3O2 → 2N2 + 6H2O

2 a) MgCO3 → MgO + CO2

b) Pb(s) + 2AgNO3(aq) → Pb(NO3)2(aq) + 2Ag(s)

c) Na2O(s) + H2O(l) → 2NaOH(aq)

d) 2FeCl2 + Cl2 → 2FeCl3

e) Fe2(SO4)3 + 6NaOH → 2Fe(OH)3 + 3Na2SO4

Questions 1.8

1 17.0g

2 60.7g

3 51.1%

Questions 1.9

1 1.2dm3

2 Volume of SO2 = 50cm3; mass of sulfur = 0.20g

Questions 1.10

1 a) 2.67moldm−3

b) 0.025moldm−3

c) 0.833moldm−3

2 a) 0.75mol

b) 0.044mol

c) 0.010mol

Answer:

B, E

Explanation:

Edge

Answer:

Explanation:

i) Red as Methyl orange shows red color in acidic medium and hyrdochloric acid is acidic.

ii) In 10cm^3 of 0.100 mole/dm^3 of hydrochloric acid, there are:

10/1000*0.1 = 1.00x10^(-3) moles of hydrochloric acid were used.

Graphite is a fantastic lubricant and a powerful electrical conductor because of these unbound electrons.

Unbound can serve as a caching server, it can also perform recursion, store records obtained from other DNS servers, and provide an authoritative service, such as if you only have a few zones.

As a result, it can act as a "glue" server or host a small zone with only a few domains, making it ideal for a lab.

Why need to utilize Unbound DNS?

With its harden-glue, access control, maximum randomization for request ID and ports, response scrubbing, case preservation, plus Denial of Service or DoS prevention capabilities, Unbound is feature-rich with DNS Security. These are only a few.

Therefore, graphite is a fantastic lubricant and a powerful electrical conductor because of these unbound electrons.

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