Please please help me

Answer:

Explanation:

whats the qustion?

Answer:

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Explanation:

Explanation:

(formula)

Answer: 1. A, 2.B, 3. D, 4. B, 5. C

Explanation:

i have P.E. too lol have a great day!

Answer:

C) Carbon dioxide is the answer.

Answer:

C. Carbon Dioxide

Carbon is absorbed by plants and chemically converted to oxygen via photosynthsis.

Hope this helps!

Answer:

1. Rubidium metal reacts very rapidly with water to form a colorless basic solution of rubidium hydroxide (RbOH) and hydrogen gas (H2).

2. Rubidium sinks because it is less dense than water. It reacts violently and immediately, with everything leaving the container. Rubidium hydroxide solution and hydrogen are formed.

Answer:

"100" is the molarity of solution.

Explanation:

The given values are:

Moles of solute,

= 5 mol

Liters of solution,

= 0.05 L

Now,

The molarity of a solution will be:

=  [tex]\frac{Moles \ of \ solute}{Liters \ of \ solution}[/tex]

On substituting the values, we get

=  [tex]\frac{5}{0.05}[/tex]

=  [tex]100[/tex]

The molarity is an important method to calculate the concentration of a solution. The molarity of calcium chloride of 16.4 g in 750.0 mL of solution is 0.196 mol L⁻¹.

The molarity of a solution is defined as the number of moles of the solute present per litre of the solution. It is mainly employed in calculating the molarity of a binary solution. It is represented as 'M' and unit is mol L⁻¹.

The equation used to calculate the molarity is given as:

Molarity = Number of moles of the solute / Volume of the solution in litres

Molar mass of CaCl₂ = 110.98 g/mol

Given mass = 16.4 g

Number of moles = 16.4 / 110.98 = 0.147

750.0 mL = 0.75 L

Molarity = 0.147 / 0.75 = 0.196 mol L⁻¹

Thus the molarity is 0.196 mol L⁻¹.

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Answer:

19.4 mL Ba(OH)2

Explanation:

H2(g) + Cl2(g) --> 2HCl(aq) (make sure this equation is balanced first)

At STP, 1 mol gas = 22.4 L gas. Use this conversion factor to convert the 100. mL of Cl2 to moles.

0.100 L Cl2 • (1 mol / 22.4 L) = 0.00446 mol Cl2

Use the mole ratio of 2 mol HCl for every 1 mol Cl2 to find moles of HCl produced.

0.00446 mol Cl2 • (2 mol HCl / 1 mol Cl2) = 0.00892 mol HCl

HCl is a strong acid and Ba(OH)2 is a strong base so both will completely ionize to release H+ and OH- respectively. You need 0.00892 mol OH- to neutralize all of the HCl. Note that one mole of Ba(OH)2 contains 2 moles of OH-.

0.00892 mol OH- • (1 mol Ba(OH)2 / 2 mol OH-) • (1 L Ba(OH)2 / 0.230 M Ba(OH)2) = 0.0194 L = 19.4 mL Ba(OH)2

The first step in answering this reaction is to write down the required reaction equations and then answer the questions from stoichiometry(mass-mole relationship).

The first equation is;

[tex]H2(g) + Cl2(g) ------->2HCl(g)[/tex]

The second equation is

[tex]2HCl(g) + Ba(OH)2(aq) -------> BaCl2(aq) + 2H2O(l)[/tex]

From stoichiometry;

1ml = 1cm3

Since hydrogen is in excess, chlorine is the limiting reactant

1 mole of Cl2 occupies 22400cm3

x moles of Cl2 occupies 100cm3

x = 1 * 100/22400

x = 0.00446 moles of Cl2

According to the reaction equation;

1 mole of Cl2 yields 2 moles of HCl

0.00446 moles of Cl2 yields 0.00446 * 2/1

= 0.00892 moles of HCl

From the reaction equation;

2 moles of HCl reacts with 1 mole of Ba(OH)2

0.00892 moles of HCl reacts with 0.00892 * 1/2 = 0.00446 moles of Ba(OH)2

Since 0.00446 moles of Ba(OH)2 reacted

number of moles = concentration * volume

number of moles =  0.00446 moles

concentration = 0.230M

Let the volume in ml be V

0.00446 =  0.230 * V/1000

V = 0.00446 * 1000/ 0.230

V = 19.39 ml

Volume in ml = 19.39 ml of Ba(OH)2

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Explanation:

Benzal .....

Molecular Formula: C11H12O4

The molar mass of aspartic acid is 133.05g/mol.

The molar mass is the mass per unit amount of substance of a given chemical entity. It is denoted by a symbol M. The SI unit of molar mass is kg/mol.

Aspartic acid is one of the building-block of amino acids which is responsible for synthesizing proteins and regulating hormones in the human body.

The chemical formula of aspartic acid is C4H7NO4.

Atomic mass of C = 12.011u, H = 1.007u, N = 14.006u, O = 16u

Molar mass of C4H7NO4 = 4(12.011)+7(1)+14.006+4(16)

                 = 48.044+7+14.006+64

                 = 133.05g/mol

Hence, the molar mass of aspartic acid is 133.05g/mol.

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Answer:

a. True

Explanation:

Hello there!

In this case, since the dose-response method is crucial concept in toxicology as it exhibits the result of exposures to toxic chemical compounds with changes in body functions or health, this statement is a. True , as this analysis is understood by means of the relationship -the higher the dose, the more severe the response-, and of course, it is based on observed data from controlled experiments in animal, human clinical, or cell studies, in the light of the determination of the toxicity of the analyzed chemical.

Regards!

Answer: I'm going to say it's Antartica because the only seasons it have is summer and winter and it doesn't change.

Explanation:

Answer:

Im gonna go with.... B. False

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Yes it is true. That physical chemistry is a bridge between physics and chemistry. Because here we study the physical behaviours of the chemical reactions.

Answer:

ethyl ethernal

Explanation:

no explanation

Answer:

0.42 J/gºC

Explanation:

We'll begin by calculating the heat energy used to heat up the water. This can be obtained as follow:

Mass (M) of water = 560 g

Initial temperature (T₁) = 22.7 °C

Final temperature (T₂) = 80.3 °C.

Specific heat capacity (C) of water = 4.18 J/gºC

Heat (Q) absorbed =?

Q = MC(T₂ – T₁)

Q = 560 × 4.18 (80.3 – 22.7)

Q = 2340.8 × 57.6

Q = 134830.08 J

Finally, we shall determine the specific heat capacity of the burner. This can be obtained as follow:

Mass (M) of burner = 699 g

Initial temperature (T₁) = 482.0°C

Final temperature (T₂) = 22.7 °C

Heat (Q) evolved = – 134830.08 J

Specific heat capacity (C) of the burner =?

Q = MC(T₂ – T₁)

–134830.08 = 699 × C (22.7 – 482.0)

–134830.08 = 699 × C × –459.3

–134830.08 = –321050.7 × C

Divide both side by –321050.7

C = –134830.08 / –321050.7

C = 0.42 J/gºC

Therefore, the specific heat capacity of the burner is 0.42 J/gºC

Answer: Model B. I have included a graph for this question. Model D is incorrect because that is a model for plasma as liquid doesn't contain ionized particles. Model C is incorrect as that represents a solid. Model A is incorrect because that is showing a gas; the particles are moving very freely

According to the forces of attraction, model B  communicates the kinetic energy and particle arrangement of a liquid.

Forces of attraction is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Your question is incomplete  but most probably your full question was, The models show the phases of a substance at various temperatures. Which model BEST communicates the kinetic energy and particle arrangement of a liquid? A. Model D, because it has high kinetic energy so the particles in the model have ionized B. Model B, because it has some kinetic energy and the particles have a free flowing shape C. Model C, because it has high kinetic energy so the particles in the model have no definite shape D. Model A, because it has some kinetic energy and the particles move freely

Answer:

velocity

Explanation:

because he is going 30 miles west

Answer:

S is [Ne] 3s²3p⁴

Cl is [Ne] 3s² 3p⁵

Explanation:

Both animal X and animal Y begin life as a tadpole and change form as they develop

Answer:

it is c, for those who want an answer fast

Explanation:

Answer:

i think it wil be 567489

Explanation:

ik im right :)

Answer:

Chromosomes are duplicated in the "s phase" of interphase.

Answer:

c

Explanation:

factor can cause more collision and increase the rate of reaction