Helpppp me pleaseeee now I’ve been struggling so bad w this

Answer:

The time recorded in the lab notebook is shorter than the true reaction time because the reaction starts the moment the two solutions were mixed

Explanation:

A chemical reaction is "a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction" (Oxford dictionary).

A chemical reaction begins immediately the reactants are mixed together in a reaction vessel because the particles of the reactants immediately begin to collide with each other. There is no lost time before reactions begins!

This implies that, the time recorded in the lab notebook is shorter than the true reaction time because the reaction starts the moment the two solutions were mixed.

Answer:

the first one is B. and E. and the second is A., B., and D. on edge 2023

Explanation:

Answer:

physical

Explanation:

Answer:

1.61 atm

Explanation:

Using general gas law equation as follows:

PV = nRT

Where;

P = pressure (atm)

V = volume (L)

n = number of moles (mol)

R = gas law constant (0.0821 Latm/molK)

T = temperature (K)

From the information provided in this question,

V = 5.00L

T = 350K

mass of O2 = 9.00g

Using mole = mass/molar mass

Molar mass of O2 = 16(2) = 32g/mol

mole = 9/32

mole = 0.28mol

Using PV = nRT

P = nRT/V

P = 0.28 × 0.0821 × 350/5

P = 8.0458/5

P = 1.609

Pressure = 1.61 atm

The pressure of the oxygen gas at the given temperature and volume is 1.61 atm.

The given parameters;

The number of the moles of the given gas is calculated as follows;

[tex]moles = \frac{m}{M} \\\\moles = \frac{9}{32} \\\\moles = 0.28 \ mol[/tex]

The pressure of the gas is calculated as follows;

[tex]PV = nRT\\\\P = \frac{nRT}{V} \\\\P = \frac{0.28 \times 0.0821 \times 350}{5} \\\\P = 1.61 \ atm[/tex]

Thus, the pressure of the oxygen gas at the given temperature and volume is 1.61 atm.

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Answer:

Can you put other picture because the picture is blurry? please

Explanation:

Answer:

≅ 0.240 grams (3 sig. figs.)

Explanation:

Rxn:   CaCO₃  +          2HCl              => CaCl₂ + H₂O + CO₂

Given:    ?g          45.67ml(0.105M)

                            = 0.04567L x 0.105 mole/L

                            =  0.0048 mole HCl

Rxn ratio for CaCO₃ to HCl is 1:2

∴ moles CaCO₃ consumed = 1/2 of moles HCl used

=> 1/2(0.0048)mole CaCO₃ used = 0.0024 mole CaCO₃

mass CaCO₃ = 0.0024 mole CaCO₃  x  100.09 grams CaCO₃/mole CaCO₃

= 0.23998 grams CaCO₃ (calculator answer)

≅ 0.240 grams (3 sig. figs.)

Answer:

Gathering viscosity data on a material gives manufacturers the ability to predict how the material will behave in the real world.

Example:

If toothpaste does not have the correct viscosity, it can either be too difficult to pump out from the tube, or pump out too much.

Answer:

please give me brainlist and follow

Explanation:

Substance in water + 3 mL Benedict's solution, then boil for few minutes and allow to cool. The common disaccharides lactose and maltose are directly detected by Benedict's reagent because each contains a glucose with a free reducing aldehyde moiety after isomerization.

Glucose and maltose give a positive Benedict test because they have a free carbonyl group to undergo oxidation.

Explanation:

So, from this, we can conclude that glucose and maltose give a positive Benedict test because they have a free carbonyl group to undergo oxidation.

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Answer:

10

Explanation:

Each 100 ml should have 5 solid naom to have 5%,

For 200 ml: 200 *5%=10

The grams of Solid NaOH needed is : ( B )  10 grams

Volume of solution = 200 mL

Percentage of solid NaOH in solution = 5.0%

Therefore the grams of solid NaOH required to prepare a 200mL solution that contains 5.0% solid will be :

5% * 200 mL

= 10 grams

Hence we can conclude that the grams of solid NaOH needed is 10 grams

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Answer:

5.29*10^25 molecules CO₂

Explanation:

Use Avogadro's Number: 6.02*10^23

87.8 mol CO₂ x 6.02*10^23 molecules CO₂/1 mol CO₂ = 5.29*10^25 molecules CO₂

Answer:

True

Explanation:

Answer:

Crystalline solids have regular ordered arrays of components held together by uniform intermolecular forces, whereas the components of amorphous solids are not arranged in regular arrays.

Explanation:

Answer:

pH = 12.20

Explanation:

Ca(OH)2 is a strong base, so it dissociates completely. A 0.08 M solution of Ca(OH)2 is 0.16 M OH-, since every mole of Ca(OH)2 has 2 OH-.

Calculate pOH using [OH-] = 0.16 M

pOH = -log(0.16) = 0.80

pH = 14 - pOH = 14 - 0.80 = 12.20

Taking into account the definition of pH and pOH, the pH of a 0.08 M solution of Ca(OH)₂ is 13.21

First of all, pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:

pH= - log [H⁺]= - log [H₃O⁺]

Similarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:

pOH= - log [OH⁻]

The following relationship can be established between pH and pOH:

pOH + pH= 14

A strong base is one that dissociates completely in water, that is, it contributes the maximum number of OH- ions.

Ca(OH)₂ is a strong base that for each Ca²⁺ cation there are two OH⁻ anions and in which for each mole of Ca(OH)₂ two moles of OH⁻ are formed.

So: [OH⁻]= 2×[Ca(OH)₂]

[OH⁻]= 2×0.08 M

[OH⁻]= 0.16 M

Replacing in the definition of pOH:

pOH= - log (0.16 M)

Solving:

pOH= 0.79

Finally, considering the relationship between pH and pOH:

0.79 + pH= 14

pH= 14 - 0.79

pH= 13.21

In summary, the pH of a 0.08 M solution of Ca(OH)₂ is 13.21

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Answer:

it will be 4:00 pm

Explanation:

subtracting eight hours from Coordinated

Answer:

Adaptation 1 is an adaptation to life cycle, Adaptation 2 is an adaptation to physical characteristics.

Explanation:

Answer:

Adaptation 1: A hornwort is a nonflowering plant that produces a large number of spores instead of seeds

by using pro.gram..

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Answer:

2N₂H₄+N₂O₄→3N₂+4H₂O; N₂H₄ gets oxidized, N₂O₄ gets reduced.

Explanation:

They tell us what substances react to form what products, so we can write an unbalanced chemical equation from those substances.

N₂H₄+N₂O₄→N₂+H₂O

To balance this equation, we need to make it so there is an even amount of each element on both sides of the reaction. We can do this by multiplying the amount of each substance by adding a coefficient in front of it.

2N₂H₄+N₂O₄→3N₂+4H₂O

To identify what is being oxidized and what is being reduced, look at the oxidation charges of each element.

N₂H₄ gets oxidized, N₂O₄ gets reduced.

Answer:

The octet rule means that atoms need a total of 8 valence electrons to fill their valence shell. Hydrogen only needs two to fill its valence shell.

Explanation:

All atoms except for hydrogen can hold a total of 8 valence electrons in their outer energy levels (2 in the s level, 6 in the p level). Hydrogen only has two electrons total, so it does not require more than the s level and two electrons to have a full valence.

Answer:

I mean ig it is, but i dk

Explanation:

Answer:

surface currents are caused by winds : deep water currents are caused by difference in water density.

I guess the answer of your question is this

Answer:

Deepwater currents are dependent on temperature and salinity.

Explanation:

Answer: The value of the equilibrium constant Kp for this reaction is [tex]3.3\times 10^3[/tex]

Explanation:

Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. It is expressed as K  

For the given balanced chemical reaction:

[tex]4NH_3(g)+5O_2(g)\rightarrow 4NO(g)+6H_2O(g)[/tex]

The expression for [tex]K_p[/tex] is written as:

[tex]K_p=\frac{[p_{NO}]^4\times [p_{H_2O}]^6}{[p_{NH_3}]^4\times [p_{O_2}]^5}[/tex]

[tex]K_p=\frac{(12.1)^4\times (65.8)^6}{(65.3)^4\times (7.79)^5}[/tex]

[tex]K_p=3.3\times 10^3[/tex]

The value of the equilibrium constant Kp for this reaction is [tex]3.3\times 10^3[/tex]

Answer:

A reaction that can only move towards the right.

Explanation:

For a reversible reaction when one of the products of the reaction is removed the reaction moves towards right hand side. More and more reactants will be converted into products. This will nullify the effect of removal of product.

Answer:

is

Explanation:

the explant

Answer:

25.155 gram

Explanation:

HCl(aq.) + NaOH(aq.) ⇒ NaCl + H2O

According the above equation equal number of moles of reactant are producing same number of moles of products.

Now, no. mole of HCl = 15.7/(1+35.5) = 0.43 moles

no. of moles of NaOH = 27/(23+16+1) = 0.675 moles

Since  the  amount  of  sodium  hydroxide  exceeds  the  amount  of  hydrochloric  acid,  the maximum amount of each substance participating in the reaction is HClν ν  0.43 moles .Therefore, the maximum amount of NaCl  that can be produced is as follow

= (23+35.5)×0.43 = 25.155 gram