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Answer:

410

Explanation:

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Answer:

Not sure.

Explanation:

Give me some time.

Answer:

About 300 million years ago, 

Explanation:

Col. Edwin Drake

Answer:

Oil was formed from the animals and plants that lived millions of years ago and the creator is John D Rockefeller and others in 1870

Answer:

14500.

Explanation:

1) Avlgadro's number is 6.022*10²³;

2) 1 mol is 6.022*10²³ atoms of Hellium, then 8.7*10²⁷ atoms is

[tex]3) \ \frac{87*10^{26}}{6*10^{23}}=14.5*10^3=14500[moles].[/tex]

Answer:

B) Solvent

Explanation:

The substance being dissolved is called the solute and the liquid doing the dissolving is called the solvent. In order for a substance to dissolve, the molecules of the solute need to interact with the molecules of the solvent.

Answer:

c could someone try to do the page for me please i will really appreciate it I'll mark brainliest i need it by the end of my geometry class

Answer: The correct answer is (a)combination.

Explanation: Direct combination and synthesis are the same process in which two reactants form to make a product

Answer: Chlorine & Bromine

Explanation:

Periodic table is important because it provides information, make easier to study and know about relationship between elements.

The periodic table is very important because it provides a huge amount of information about elements and their relationship to one another. The table can be used to know about the properties of elements.

So we can conclude that periodic table is important because it provides information, make easier to study and know about relationship between elements.

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Answer:

I think what you are looking for is below

Explanation:

CO2 + 2 NH3 →  (NH2)2CO + H2O

Answer:

If 3.4 moles of carbon dioxide (CO2) form at the end of the reaction, 1.7 moles of oxygen gas

(02) and 3.4 moles of carbon monoxide (CO) entered the reaction

Explanation:

The rule of three or is a way of solving problems of proportionality between three known

values and an unknown value, establishing a relationship of proportionality between all of

them. That is, what is intended with it is to find the fourth term of a proportion knowing the

other three. Remember that proportionality is a constant relationship or ratio between different

magnitudes.

If the relationship between the magnitudes is direct, that is, when one magnitude increases, so

does the other (or when one magnitude decreases, so does the other), the direct rule of three

must be applied. To solve a direct rule of three, the following formula must be followed:

ab

cx

So

C*b

T =

a

In this case, it is possible to use the reaction stoichiometry of the reaction (that is, the

relationship between the amount of reagents and products in a chemical reaction) and the rule

of three to calculate the quantities of moles requested:

.

,

If by stoichiometry 2 moles of CO2 are formed by 1 mol of O2, if 3.4 moles of CO2 are

formed, how many moles of O2 are needed?

molesofo2 = 3.42

=

moles of O2=1.7 moles

• If by stoichiometry 2 moles of CO2 are formed by 2 moles of CO, if 3.4 moles of CO2 are

formed, how many moles of CO are needed?

molesof CO =

=

3.4*2

2

moles of CO=3.4

Answer:

2%

Explanation:

.2 g  / 10 g    * 100% = 2%

Answer:

[tex]c = 0.441mol{dm}^{ - 1} [/tex]

Explanation:

[tex]m = 25.22g \\ v = 2.2l = 2.2 {cm}^{3} \\ mm(lif ) = 7 + 19 \\ = 26g {mol}^{ - 1} \\ number \: of \: moles(n) = \frac{m}{mm} \\ = \frac{25.22g}{26g {mol}^{ - 1} } \\ = 0.97mol \\ concetration(c) = \frac{n}{v} \\ = \frac{0.97mol}{2.2 {cm}^{3} } \\ c = 0.441mol {dm}^{ - 3} [/tex]

Answer:

Hydrogen bonding

Explanation:

Molarity, M = (n x 1000) / vol (in ml)

M = 17.2 x 1000/ 2000

M = 8.6 mol/L

The required pH of the solution is 4.2 which means solution is acidic in nature.

pH of the solution is define as the negative logarithm of the concentration of the hydronium ion, and it is represented as:

pH = -log[H⁺]

Given concentration of H₃O⁺ ion = 6.25×10⁻⁵ M

On putting this value on above equation, we get

pH = -log(6.25×10⁻⁵) = 4.2

Hence required pH of the solution is 4.2.

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Commercial agriculture can often lead to water-quality problems in the following ways:

Water quality refers to the state of a water body that encompasses it's physical, chemical and biological characteristics.

The water quality of a water body is crucial to its suitability for domestic or drinking purpose.

Commercial agriculture greatly affects water quality in the following ways:

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Answer:

B

Explanation:

Phosphofructokinase-1

Answer:

The s stands for the phase of that element or compound. The phase solid is represented by (s). In this problem it is saying solid sodium (Na) is reacting with Bromine (Br) gas to form sodium bromide.

Explanation:

[tex]27 ~\text{cal} = \dfrac{27}{1000} ~ \text{kcal} = 0.027~ \text{kcal.}[/tex]

The regression equation supports the hypothesis by showing associations between sets of scientific data (in this case, half life cycle and radioactivity).

The regression equation is a type of mathematical tool employed to determine the association between variables.

The regression equation can help to understand the relationships between independent and dependent variables.

In conclusion, the regression equation supports the hypothesis by showing associations between sets of scientific data.

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Answer:

Quite Strongly

Explanation:

Got it right 2022 edge

Answer: Arsenic

Explanation:

Arsenic is in column 15 of the periodic table, which means that it has 5 valence electrons.

Answer:  How much heat is required to convert 29 g of ice at -4.0 ˚C to water vapor at 105 ˚C (report your answer to three significant figures)? Answer all five parts, showing your detailed calculations: i) Heat to warm ice from -4.0 to 0 oC: ii) Heat to convert ice to liquid: iii) Heat to warm liquid to boiling: iv) Heat to convert liquid to gas

Explanation:

e

The answer is the half life of phosphorus-32 is of 14 days .

The half-life of a radioactive isotope is the amount of time it takes for one-half of the radioactive isotope to decay.

The half-life of a specific radioactive isotope is constant; it is unaffected by conditions and is independent of the initial amount of that isotope.

Mass of atoms initially,

N₀ =2.0 g

Mass after 42 days,

N =0.25 g

mass left undecayed we have,

[tex]\rm\dfrac{N}{N_{0}} = \dfrac{1}{2^{n}}[/tex]

where  n  is number of half lives occured (the number of times it disintegrated into half of original)

[tex]\rm\dfrac{0.25}{2} = \dfrac{1}{2^{n}}[/tex]

[tex]\rm\dfrac{1}{8} = \dfrac{1}{2^{n}}[/tex]

[tex]\rm\dfrac{1}{2^{3}} = \dfrac{1}{2^{n}}[/tex]

n= 3

number of half lives occured in 42 days is 3

if half life is  [tex]\rm t_{\frac{1}{2} }[/tex]

then

3* (  [tex]\rm t_{\frac{1}{2} }[/tex]  )  = 42

[tex]\rm t_{\frac{1}{2} }[/tex] = 14 days

Therfore the half life of phosphorus-32 is of 14 days .

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Answer:

Calcium hydroxide is a white precipitate, too, and it won't dissolve if more sodium hydroxide is added to the solution. No significant precipitate will be formed between calcium ions and ammonia.

Answer:

Cl

Explanation:

In a covalent bond between Cl and H, (Cl) tends to attract electron density from the other element in the bond.

Chlorine is more electronegative than hydrogen. In general, elements towards the top-right of the periodic table are more electronegative. This is because these elements are desperate for a few more electrons to fill their outermost shell (and have a full octet). The more electronegative an element is, the more it wants electrons. As a result, highly electronegative atoms have a greater pull on the electrons in a covalent bond.

The equilibrium constant (Keq) is given for the reversible reactions. The concentration of hydrogen iodide will be 1.58 M.

The equilibrium constant (Keq) is the proportion of the ratios of the concentration of the products to the reactants.

The balanced chemical reaction is shown as:

2HI  ⇔ H₂ + I₂

The equilibrium expression for the reaction can be given as:

Keq = [H₂] [I₂] / [HI]²

Given,

Equilibrium constant = 1.6 × 10⁻⁴

Concentration of dihydrogen = 2  × 10⁻³ M

Concentration of iodine = 2 × 10⁻³ M

The concentration of hydrogen iodide is calculated as:

1.6 × 10⁻⁴ = [ 2  × 10⁻³ M][2  × 10⁻³ M] ÷ [HI]²

[HI]² = 4  × 10⁻⁶ ÷ 1.6 × 10⁻⁴

= 2.5 M

[HI] = 1.58 M

Therefore, 1.58 M is the concentration of hydrogen iodide.

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The student, begins emphasis, most, ends emphasis, likely trying to answer How does temperature affect the physical state of water.

A usually reversible change in the physical properties of a substance, like size or shape: Freezing a liquid is a physical change.

The temperature has a direct effect on whether a substance exists as a solid, liquid or gas. Generally, increasing the temperature turns solids into liquids and liquids into gases; reducing it turns gases into liquids and liquids into solids.

Hence, option D is correct.

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Answer:

how was enacting the GI bill Like teaching someone how to fish

Answer: hydrogen bonding

Explanation:

When hydrogen atoms bond with oxygen atoms, there is hydrogen bonding.