Multiple choice!
:D god

Answer:

Correct: B

Explanation:

The first block wont move because:

Σf=3-3=0N.

The second block will move because:

Σf:5-3=2N (direction to the right).

The third block will move because:

Σf=3N (direction to the right).

A system's equilibrium will move to the right, or toward the side of the products, in accordance with Le Chatelier's principle, if more reactants are added. ... The equilibrium will move to the left if we add more product to a system, producing more reactants.

Solution: By increasing the number of reactants, the equilibrium moves to the right and in the direction of the products.

Thus, if a reactant is added, equilibrium shifts to the right, away from the reactant. Equilibrium shifts to the left, away from the product, when a product is added. If we take away the product, equilibrium returns and produces the product. Reactant is created if reactant is removed, breaking the equilibrium.

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Answer:

P2 = 1.94 kPa

Explanation:

Given the following data;

Initial pressure = 2.36 kPa

Initial temperature = 62°C

Standard temperature = 0°C

Conversion:

Kelvin = 273 + C

Kelvin = 273 + 62 = 335 K

Kelvin = 273 + 0 = 273 K

To find the final pressure, we would use Gay Lussac's law;

Gay Lussac states that when the volume of an ideal gas is kept constant, the pressure of the gas is directly proportional to the absolute temperature of the gas.

Mathematically, Gay Lussac's law is given by;

\( PT = K\)

\( \frac{P1}{T1} = \frac{P2}{T2}\)

Making P2 as the subject formula, we have;

\( P_{2}= \frac{P1}{T1} * T_{2}\)

\( P_{2}= \frac{2.36}{335} * 273 \)

\( P_{2}= 0.0071 * 273 \)

P2 = 1.94 kPa

Answer:

E- an ion is positive if it has more protons than it has neutrons

The correct answer is "It determines how difficult it is to start the reaction." (Option B)

Answer:

Ice carving. It's still ice, it's not water, and it changes shape while not changing it's matter

Explanation:

From a climate perspective, the term that applies to carbon dioxide, methane, and nitrous oxide is greenhouse gases, option D.

Due to minute concentrations of water vapour (H₂O), carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O) in the atmosphere, the Earth has a natural greenhouse effect. These gases allow solar light to reach the Earth's surface, but they also absorb infrared radiation that the Earth emits, warming the planet's surface. The augmented greenhouse effect must be distinguished from the natural greenhouse effect. The natural greenhouse effect, which is essential to life, is brought on by the levels of greenhouse gases that occur naturally. The Earth's surface would be around 33 °C colder in the absence of the natural greenhouse effect.

The extra radiative forcing brought on by higher greenhouse gas concentrations brought on by human activity is known as the enhanced greenhouse effect. In the lower atmosphere, ozone, carbon dioxide, methane, nitrous oxide, hydrochlorofluorocarbons (HCFCs), and hydrofluorocarbons (HFCs) are the principal greenhouse gases whose concentrations are growing.

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Complete question:

From a climate perspective, what term applies to carbon dioxide, methane, and nitrous oxide.

A. fossil fuels

B. ozone layer

C. inert gases

D. greenhouse gases

2.02 g mass of oxygen are produced during the decomposition of 4.04 g of potassium nitrate.

According to the law of conservation of mass, the total mass of the reactants in a chemical reaction is equal to the total mass of the products. Therefore, we can use this law to determine the mass of oxygen produced in the decomposition of potassium nitrate.

Let's assume that x grams of oxygen (O2) are produced during the decomposition of 4.04 g of potassium nitrate (KNO3). The balanced chemical equation for the decomposition of KNO3 is:

2 KNO3 --> 2 KNO2 + O2

From the equation, we can see that 2 moles of KNO3 produce 1 mole of O2. We can use this information to set up a proportion to solve for x:

2 mol KNO3 / 1 mol O2 = 4.04 g KNO3 / x g O2

Solving for x, we get:

x = (1 mol O2 / 2 mol KNO3) x (4.04 g KNO3) = 2.02 g O2

Therefore, 2.02 g of oxygen are produced during the decomposition of 4.04 g of potassium nitrate using law of conservation of mass.

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Answer:

Nobles Gases Are the group of elements which are generally unreactive

Answer:

43.5

Explanation:

there are 43.5 moles of N2

The mass of potassium chromate that will dissolve in 200g of water at 50°C depends on the solubility of potassium chromate in water at that temperature.

To determine the mass of potassium chromate that will dissolve in 200g of water at 50°C, we need to know the solubility of potassium chromate in water at that specific temperature. The solubility of a compound represents the maximum amount of that compound that can dissolve in a given amount of solvent at a particular temperature.

Unfortunately, the provided information does not include the solubility of potassium chromate in water at 50°C. Solubility values are typically provided in grams of solute per 100 grams of solvent (usually water) at a specific temperature.

To calculate the mass of potassium chromate that will dissolve, we would need to know the solubility data for potassium chromate at 50°C. With that information, we could use the solubility value to determine the maximum mass of potassium chromate that can dissolve in 200g of water at that temperature.

Without the solubility data, it is not possible to provide a specific value for the mass of potassium chromate that will dissolve.

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The question is incomplete, the complete question is;

As Danny was pouring cereal for his breakfast, he noticed that the cereal box says that the cereal contains 5 milligrams of iron per serving. Danny decided to perform an experiment to test this claim. He found that the cereal contains 4.6 milligrams of iron per serving. Based on Danny's measurement, the value reported on the label is ( CORRECT OR INCCORECT) because A: (IT IS DIFFERENT FROM THE VALUE DANNY MEASURED) B: (IT IS REORTED TO THE NEAREST MILLIGRAM) C: (IT USES THE SAME UNITS THAT DANNY USED).

Answer:

CORRECT because IT IS REORTED TO THE NEAREST MILLIGRAM

Explanation:

In mathematics, values may be rounded up or down as required. In the case of this measurement of cereals by Danny, it is customary to measure the amount of iron per serving to the nearest milligram.

As such, even though Danny found out that the actual amount of iron per serving in the cereal is 4.6 milligrams, the value reported on the cereal box is still correct because it was reported to the nearest milligram hence the value had to be rounded up.

Elements that are in the same group have the same number of electrons in their outer shell. These outer electrons are so important in determining the chemical properties of an element that a special way to represent them has been developed. A(n) electron dot diagram uses the symbol of the element and dots to represent the electrons in the outer shell.

The elements in the same group have the same number of electrons in their outer shell because they have the same number of valence electrons. These valence electrons are responsible for the chemical properties of an element, which is why elements in the same group have similar chemical properties. The symbol of the element is used in the electron dot diagram to represent the element, and the dots are used to represent the valence electrons in the outer shell. This diagram is a useful tool for understanding the chemical behavior of an element and for predicting how it will react with other elements.

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Answer:

La respuesta está en la explicación

Explanation:

Los átomos que no poseen ___CARGA____ son conocidos como ____ÁTOMOS____ ____NEUTROS_____. Los átomos que poseen carga se denominan ___IONES____, aquellos con carga positiva de llaman ____PROTONES____ y son aquellos que __PIERDEN__ electrones. Los ______ANIONES____ son aquellos con carga negativa y son los que _____GANAN___ electrones. Para todos los casos el valor de _MASA__ y _NÚMERO ATÓMICO_ permanecen iguales y son los que sacamos de la tabla periódica.

If the theoretical yield of a reaction is 24.8 g and the actual yield is 18.5 g,  The percent yield that we get is 74.6%

Percent yield is the percent ratio of actual yield to the theoretical yield. It is calculated to be the experimental yield divided by the theoretical yield multiplied by 100%. If the actual and theoretical yield ​is the same, the percent yield is 100%

Here it is given the actual yield is 18.5g and the theoretical yield is 24.8g

Formula to calculate percent yield:

Percent yield = actual yield/ theoretical yield × 100

                      = 18.5 / 24.8 × 100

                      = 74.6 %

Therefore the percent yield is 74.6%

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Answer:

Explanation:

D

The cellular organelle that is most affected by CO poisoning is mitochondria (option B).

Mitochondria is a cellular organelle found in eukaryotic cells and responsible for the production of energy in form of ATP.

Carbon monoxide (CO) is a common environmental pollutant released when fossil fuels are burned. The major target of this pollutant is the mitochondria.

Carbon monoxide (CO) binds to cytochrome oxidase of the electron transport chain in the mitochondria, thereby, blocking oxidative phosphorylation and ATP production. As ATP declines, there is no energy to drive the breathing muscles.

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The pH of the solution is 1.52 and the concentration of C6H6O62- is 2.2 * 10^-7 M.

We know that;

H₂C6H6O6 ⇔HC6H6O6^-(aq)    +   H^+(aq) ----- (1)

Ka1 = 7.9 x 10^-5

Again;

HC6H6O6^-(aq) ⇔ C6H6O6^2-(aq)  +   H^+(aq) ------- (2)

Ka2 = 1.6 x 10^-12

Given that Ka2 <<<< Ka1 we have to apply equation 1 to obtain H^+ hence;

Ka1 = [HC6H6O6^-] [H^+]/[H₂C6H6O6]

Let  [HC6H6O6^-] = [H^+] =x

7.9 x 10^5 =x^2/0.1 - x

But x <<< 0.1 thus;

7.9 x 10^5 =x^2/0.1

x = √7.9 x 10^-5  * 0.1

x = 0.03 M

pH = -log(0.03 M)

pH = 1.52

To obtain  C6H6O6^2-;

Ka2 = [ C6H6O6^2-] [ H^+]/[HC6H6O6^-]

Also;

[ C6H6O6^2-] = [ H^+]= x

Now;

1.6 x 10^-12 = x^2/0.03 -x

But x<<<0.3

Hence;

1.6 x 10^-12 = x^2/0.03

x = √1.6 x 10^-12 * 0.03

x = 2.2 * 10^-7 M

The concentration of C6H6O6^2- is  2.2 * 10^-7 M.

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Considering the definition of electronic configuration and valence shell, the number of core electrons is 1, because the valance shell is the third energy level.

The Electronic Configuration of the elements is the arrangement of all electrons of an element in energy levels and sub-levels (orbitals).  

There are 7 energy levels, numbered from 1 to 7, and in which electrons are distributed, logically in order according to their energy level. Electrons with less energy will be spinning at level 1.

Each level is divided into sub-levels. These sub-levels into which each level is divided can be up to 4. These 4 sub-levels are called: s, p, d, f.

Aufbau's principle is a principle of atomic physics, which explains how electrons are accommodated in their orbits around the nucleus of the atom.

This principle states that the filling of these orbitals occurs in increasing order of energy, that is, from the orbitals of lower energy to those of higher energy.

The simplest of the sub-levels is 1s. If you fill the 1s you can start filling the 2s. After the 2s sub-level is satisfied, the 2p can begin to fill and so on.  

The valence shell is the one where the outermost electrons are found, those electrons that are in the last level. Because it is the outermost shell, it is also the farthest from the atomic nucleus.

The valence shell is one whose electrons are responsible for the chemical properties of an element.

In this case, an atom has 2 electrons in the first energy level, 8 electrons in the second energy level, and 1 electron in the third energy level. So, the number of core electrons is 1, because the valance shell is the third energy level.

Learn more:

The disadvantage of increasing our use of solar energy is that unfortunately currently, the production and storage of solar energy is bit as cost efficient when compared to obtaining the same quantity of energy from fossil fuels.



Answer: The density of the rock is 2g/mL. Hope this helped! :)

Explanation:

V= 3.0mL                                                               D=M/V

M= 6.0g

D=6.0g/3.0mL

D= 2.0g/mL

To make 500ml of a 0.250m phosphate buffer at ph 7.6, mix 125 ml of 0.5 M sodium phosphate monobasic (NaH₂PO₄) and 375 ml of 0.5 M sodium phosphate dibasic (Na₂HPO₄).

To make a 0.250 M phosphate buffer at pH 7.6, mix the two sodium phosphate salts in the correct ratio to give a pH of 7.6. The Henderson-Hasselbalch equation can be used to calculate the required ratio of the two salts:

pH = pKa + log([base]/[acid])

where pKa is the dissociation constant of the weak acid, [base] is the concentration of the conjugate base, and [acid] is the concentration of the weak acid.

For the phosphate buffer system, the pKa is 7.2, and we want a pH of 7.6, which is 0.4 pH units above the pKa. Using the Henderson-Hasselbalch equation, we can solve for the ratio of [base]/[acid]:

7.6 = 7.2 + log([base]/[acid])

0.4 = log([base]/[acid])

[base]/[acid] = 10^(0.4)

[base]/[acid] = 2.5119

Now, we can use this ratio to calculate the amounts of each salt needed:

Let x be the volume of 0.5 M sodium phosphate monobasic (NaH₂PO₄) needed

Then, the volume of 0.5 M sodium phosphate dibasic (Na₂HPO₄) needed would be (500 ml - x)

The moles of NaH₂PO₄ in solution would be 0.5x/1000

The moles of Na₂HPO₄ in solution would be 0.5(500-x)/1000

To get a buffer concentration of 0.250 M,

0.250 = [NaH₂PO₄]/(NaH₂PO₄] + [Na₂HPO₄]) = (0.5x/1000)/(0.5x/1000 + 0.5(500-x)/1000)

0.250 = 0.5x/(0.5x + 0.5(500-x))

0.250 = 0.5x/(250)

x = 125 ml

Therefore, we need to mix 125 ml of 0.5 M sodium phosphate monobasic (NaH₂PO₄) and 375 ml of 0.5 M sodium phosphate dibasic (Na₂HPO₄) to make 500 ml of a 0.250 M phosphate buffer at pH 7.6.

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Answer:

neutrons in c,o,b,h

Explanation:

i think so

Answer:

6860

Explanation:

The final concentration of cells in the diluted culture is 3.6 x 108 cfu/ml

To calculate the final concentration, the formula was used

V1 . C1 = V2. C2

Where

V1 = initial volume

C1 = initial concentration

V2 = final volume

C2 = final concentration

V1 . C1 = V2. C2

Clearing C2 we get

C2 = V1 . C1/V2

Data

V1 = 0.05ml

C1 = 3.6 x 10∧6 cfu/ml

V2 = 0.05ml + 4.95ml = 5ml

Subsequently, the data is replaced in the formula

C2 = V1 . C1/V2

C2 = 0.05 . 3.6 x 10∧6 / 5ml

C2 = 3.6 x 10∧8 cfu/ml

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Explanation: B.

Bees pollinate in order to sweeten their seed

Answer:

A

Explanation:

Bees make excellent pollinators because most of their lives is spent collecting pollen which acts as a protein to feed their offspring

Answer:

b:  

Jacque could check if the rock layer has fossils in it.

Explanation:

!!!!!! that's what 4 of my teachers said

A claim about the arrangements of electrons and properties within a family of elements is described below:

Families of elements refer to elements that are found in the same group in the periodic table.

Elements that belong to the same family have the same arrangement of electrons.

The families of elements are found in the vertical columns knowns as groups. They have the same physical properties because they have the same number of e; electrons in their outermost shell.

For example, elements belonging to group 1 have one valence electron and show similarity in their chemical properties.

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