what does it mean to have a fair test?​

Answer:

AMBANTOT MO MALIGO KANA

nucleus: controls cell

cell membrane: controls what goes in and out of a cell

cytoplasm: where chemical reactions take place

Answer:

Nucleus: DNA Storage

Mitochondrion Energy production

smooth Endoplasmic Reticulum (SER)   Lipid production; Detoxification

Answer:

alkali metals

Explanation:

alkali metals

The alkali metals, found in group 1 of the periodic table (formerly known as group IA), are very reactive metals that do not occur freely in nature. These metals have only one electron in their outer shell. Therefore, they are ready to lose that one electron in ionic bonding with other elements.

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Answer:

x and y

Explanation:

Answer:

wx

Explanation:

Because the w is going toward the x

Answer:

3.2447

Explanation:

m1v1 = m2v2

12.9 grams of Cl are in a 38.0-g sample of the chlorofluorocarbon C2F3Cl3.

Chlorofluorocarbon is defined as a gas that was previously widely employed in many items (like aerosols), but is thought to harm the ozone layer in the Earth's atmosphere. Halogen exchange using chlorinated methane's and ethane's as the starting point often produces CFCs and HCFCs. The chlorofluorocarbons undergo free-radical reactions to produce the brominated derivatives, which replace C-H bonds with C-Br bonds.

1 Carbon + 3 Fluorine + 1 Chlorine = CF3Cl

1 × (12.011 g/mol) plus 3 x (18.988 g/mol) + [1 x 35.453 g/mol] 104.428 grams per mole

1 mole per 104.428 grams of 38.0 grams equals 0.364 moles. 0.364% CF3Cl moles 1 mole of Cl and 1 mole of CFCl3 in CF3Cl equals 0.364 moles of Cl.

Chlorine weighs 35.453 grams per mole, so 12.9 grams of chlorine are contained in every 38.0 grams of CF3Cl.

Thus, 12.9 grams of Cl are in a 38.0-g sample of the chlorofluorocarbon C2F3Cl3.

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A chemical reaction is a product formation through the reactants. In a reaction the number of atoms, molecules, and mass are conserved. Thus, option D is correct.

A chemical reaction involves a reactant on the left side of the reaction equation that changes to produce reactants. In a reaction, the conservational law of mass is always followed.

The number of atoms and the molecules involved in a reaction is also the same in the reactants and the products formed as can be seen from the stoichiometry coefficient of the balanced equation.

Therefore, option D. mass, atoms, and molecules are conserved in a reaction.

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Hg⁺ with I⁻ forms HgI

Hg⁺ with S²⁻ forms Hg₂S

Hg⁺ with CO₃²⁻ forms Hg₂CO₃

K⁺ with I⁻ forms KI

K⁺ with S²⁻ forms K₂S

K⁺ with CO₃²⁻ forms K₂CO₃

Answer:

Elements that are metals tend to lose electrons and become positively charged ions called cations.

Elements that are nonmetals tend to gain electrons and become negatively charged ions called anions.

Hope it helps:)

Metal are the  family of elements which is most likely to lose electrons. Non metals are the  family of elements which is most likely to gain electrons.

The quantity of protons an element has defines it. An element's atoms all contain the same amount of protons, but its electron and neutron counts might vary. Ions are produced by altering the electron to proton ratio, whereas isotopes are produced by altering the neutron count.

118 known elements are present. A study is being done to create element 120.1. The periodic table will have to be modified to include element 120 after it has been created and validated. Metal are the  family of elements which is most likely to lose electrons.

Therefore,  metal are the  family of elements which is most likely to lose electrons.

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Let's compare the Z, N, and A values for each pair of atoms:
(a) 3H1 and 3He2:
- 3H1: Z=1, N=2, A=3
- 3He2: Z=2, N=1, A=3
The Z and N values are reversed, while the A values are equal.
(b) 14C6 and 15N7:
- 14C6: Z=6, N=8, A=14
- 15N7: Z=7, N=8, A=15
Z values differ by 1, N values are equal, and A values differ by 1.
(c) 19F9 and 18F9:
- 19F9: Z=9, N=10, A=19
- 18F9: Z=9, N=9, A=18
Z values are equal, N values differ by 1, and A values differ by 1.

For the first pair of atoms, 3 H 1 and 3 He 2, the z value (atomic number) is different as hydrogen has 1 proton while helium has 2. The n value (number of neutrons) is also different as helium has one more neutron than hydrogen. However, the a value (mass number) is the same for both, which is 3.
For the second pair, 14 C 6 and 15 N 7, the z value is different as carbon has 6 protons while nitrogen has 7. The n value is also different as nitrogen has one more neutron than carbon. Therefore, the a value is different for both, with carbon having an a value of 14 and nitrogen having an a value of 15.
Finally, for the third pair, 19 F 9 and 18 F 9, the z value is different as fluorine has 9 protons while the other fluorine atom has 1 less proton. However, the n value is the same for both, which is 10. Therefore, the a value is different for both, with the first fluorine atom having an a value of 19 and the second having an a value of 18.
Overall, the z, n, and a values can vary for different pairs of atoms depending on their atomic structure and composition.
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Answer:

B. Ca(NO2)2

Explanation:

Ions (charged atoms) combine with one another to form stable ionic compounds. In this case, calicium ion (Ca2+) is said to react with NO2, which has a charge of -1 i.e. +1-1(2) = 1-2 = -1.

This means that calcium has a charge of +2 while nitrite ion has charge of -1, hence, when they combine, they exchange their charges, which become their subscript as follows:

Ca2+ + NO2- → Ca(NO2)2

Ca(NO2)2 is a stable ionic compound called calcium nitrite. Notice that it takes two atoms of NO2- to react with one atom of Ca2+.

The percent yield for the reaction is 84.6%.

To calculate the percent yield for the reaction, we first need to determine the theoretical yield of CO₂ based on the balanced chemical equation for the reaction:

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

From the equation, we can see that for every mole of C₃H₈ , 3 moles of CO₂ are produced. So, to determine the theoretical yield of CO2, we need to first convert the mass of C₃H₈ to moles and then multiply that by the stoichiometric ratio for CO₂.

The molar mass of C₃H₈ is 44.1 g/mol, so:

3.66 g C₃H₈ / 44.1 g/mol = 0.083 mol C₃H₈

Using the stoichiometry of the reaction, we can now calculate the theoretical yield of CO₂:

0.083 mol C₃H₈ × 3 mol CO₂ / 1 mol C₃H₈ = 0.25 mol CO₂

And the theoretical mass of CO₂:

0.25 mol CO₂ × 44.01 g/mol = 11.0025 g CO₂

Finally, the percent yield of the reaction can be calculated as:

9.31 g CO₂ / 11.0025 g CO₂ × 100% = 84.6%

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In the standard welding system, the ground clamp or work clamp connects the reference line to the joint or area to be welded.

In welding, the ground clamp (also known as the work clamp) plays a crucial role in the standard welding system. It is used to establish an electrical connection between the welding machine and the workpiece. The ground clamp is typically connected to the reference line, which is usually the welding machine's negative terminal or ground connection.

The purpose of connecting the ground clamp to the joint or area to be welded is to create a closed electrical circuit. When the welding machine generates an electrical current, it flows through the electrode or welding torch, passes through the workpiece, and returns through the ground clamp to complete the circuit. This circuit allows the welding process to occur, with the heat generated by the electrical current melting the workpiece material and forming a weld.

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During each step of the electron transport system, electrons move to a more electronegative carrier, and thus move closer to a more stable state of energy.

Electrons are transferred to more electronegative carrier molecules during the electron transport chain (ETC) of cellular respiration. This creates an electron gradient across the membrane that can be used to produce ATP energy molecules. In the mitochondria of eukaryotic cells, the electron transport chain takes place. The electron transport chain includes several carriers of electrons that are membrane-bound.

NADH and FADH2 transfer electrons and hydrogen ions to the electron transport chain carriers during cellular respiration. These electrons then pass from one carrier molecule to the next, which allows the carriers to pump protons from the mitochondrial matrix to the intermembrane space. This sets up an electrochemical gradient that leads to the creation of ATP by the enzyme ATP synthase.

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Yes, you are correct that lithium-ion batteries contain cobalt, nickel, and other metals. When these batteries are not disposed of properly, there is a risk that these metals can leak into the environment, potentially contaminating groundwater. This can pose serious environmental and health hazards.

To minimize the risks associated with improper disposal of lithium-ion batteries, it is essential to follow appropriate recycling and disposal guidelines. Many communities have designated collection points or recycling programs for batteries and electronic waste, ensuring that the toxic metals are safely contained and managed.
Moreover, research is underway to develop more sustainable alternatives to traditional lithium-ion batteries, including designs that reduce or eliminate the need for cobalt and other potentially harmful materials. This could help lessen the environmental impact of battery production and disposal in the future.
In summary, lithium-ion batteries do contain cobalt, nickel, and other metals that can contaminate groundwater if not properly disposed of. Proper recycling and disposal measures should be taken to minimize this risk, and ongoing research aims to develop more sustainable battery technologies.

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Answer:

Identify the disaccharide that fits each of the following descriptions: a. not a reducing sugar b. composed of two glucose units c. also called milk sugar d. hydrolysis gives glucose and fructose

Answer:

n = 7.86 mol

Explanation:

This question can be solved using the ideal gas law of PV = nRT.

Temperature must be in K, so we will convert 22.5C to 295 K ( Kelvin = C + 273).

R is the ideal gas constant of 0.0821.

(2.24atm)(85.0L) = n(0.0821)(295K)

Isolate n to get:

n = (2.24atm)(85.0L)/(0.0821)(295K)

n = 7.86 mol

Answer:

The heliocentric theory was better supported by data explaining the rotation of the planets and other bodies in the solar system.

Explanation:

Answer: 1.14 M

Explanation:

500 mL is equal to 0.5 L.

So, the molarity is (0.570)/(0.5) = 1.14 M

Suppose a vessel contains HI at a concentration of 0.32 M. The concentration of HI in the vessel 0.88 seconds later is 0.175 M.

Initial concentration of HI = 0.32 M

Time = 0.88 s

Rate is given as 0.684 s⁻¹

The concentration of HI in the vessel 0.88 seconds later. It can be expressed as :

ln (HI) = ln (HI)₀ - (kt)

Where;

(HI)₀ is the initial concentration

k is the reaction rate constant

t is time

Now, we have;

ln (HI) = In (0.32) - (0.684 × 0.88)

ln (HI) = -1.1394 - 0.6019

ln (HI) = -1.7413

(HI) = e^(-1.7413)

(HI) = 0.175 M

Thus, the concentration of HI is 0.175 M.

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This question is incomplete the complete question is :

Consider this reaction: 2 HI(g) ⇄ H₂(g) + I₂(g)

At a certain temperature, this reaction follows first - order kinetics with a rate constant of 0.684 s^(-1). Suppose a vessel contains HI at a concentration of 0.32 M. Calculate the concentration of HI in the vessel 0.88 seconds later. you may assume no other reaction is important. round your answer to significant digits.

Answer:

mechanical digestion is the physical part of digestion

Answer:

mechanical digestion

Explanation:

Answer:

10.875 miles

So 87 minutes

.125 miles per minute

So just multiply int his case

87*.125

You’d get 10.875

Answer:

The shapes of continents fit together like a puzzle.

Explanation:

Just look at the east coast of South America and the west coast of Africa—it's almost a perfect fit! Identical rocks have been found on different continents. These rocks formed millions of years ago before the continents separated.

Answer: condensation, exothermic reaction, freezing

Explanation: Edge

The heating curve could describe processes such as boiling, condensation and freezing.

A heating curve is a plot or graph wherein a substance is subjected to increasing temperature against time to measure the amount of energy it absorbs and changes state with increasing temperature.

Which processes could the heating curve be describing?

The heating curve could describe processes such as boiling, condensation and freezing.

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If more \(H_{2}\) and \(N_{2}\) are added to the reaction 3\(H_{2}\) + N2 → 2\(NH_{3}\) after it reaches equilibrium, two events will occur Shift in Equilibrium and Increased Yield of \(NH_{3}\)

1. Shift in Equilibrium: According to Le Chatelier's principle, when additional reactants are added, the equilibrium will shift in the forward direction to consume the added reactants and establish a new equilibrium. In this case, more \(NH_{3}\) will be produced to counteract the increase in \(H_{2}\) and \(N_{2}\).

2. Increased Yield of \(NH_{3}\): The shift in equilibrium towards the forward reaction will result in an increased yield of \(NH_{3}\). As more \(H_{2}\) and \(N_{2}\) are added, the reaction will favor the production of \(NH_{3}\) to maintain equilibrium. This will lead to an increase in the concentration of \(NH_{3}\) compared to the initial equilibrium state.

It is important to note that the equilibrium position will ultimately depend on factors such as the concentrations of \(H_{2}\), \(N_{2}\), and \(NH_{3}\), as well as the temperature and pressure of the system. By adding more reactants, the equilibrium will adjust to achieve a new balance, favoring the formation of more \(NH_{3}\).

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Answer:

1 taza = 250 ml eso creo

Explanation: Eso creo jejejejeje.

The mass of H₂SO₄ that must dissolved in 1.08 liters of solution to make 2.69M solution is 271.52 grams.

The molarity of the substance is defined as the number of moles of solute per unit volume of solution in liters.

In this case,

The volume of the solution is 1.08 L.

The required molarity of the substance is 2.69M.

So,

we can write,

Molarity = Moles/Volume

Moles = Molariyt x volume

Moles =2.69 x 1.03

Moles = 2.77

Moles = Mass required/molar mass.

Molar mass of H₂SO₄ is 98 g/mol.

Putting values,

2.77=Mass required/98

Mass required = 271.52 grams.

So, 271.52 grams of H₂SO₄ is required to make 2.69M solution.

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i cant understand your question define briefly

There are approximately 1.290 x 10^24 molecules in 48.0 L of oxygen gas (O₂).

To determine the number of molecules in a given volume of gas, we need to use the ideal gas law and Avogadro's principle. The ideal gas law states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin. First, let's convert the given volume of 48.0 L to moles. We can assume the temperature and pressure are constant. The molar volume of any gas at standard temperature and pressure (STP) is 22.4 L/mol.

48.0 L / 22.4 L/mol ≈ 2.143 moles

Now, we need to convert moles to molecules. One mole of any substance contains Avogadro's number of molecules, which is approximately 6.022 x 10^23 molecules/mol.

2.143 moles x 6.022 x 10^23 molecules/mol ≈ 1.290 x 10^24 molecules

It's important to note that this calculation assumes ideal gas behavior, which may not be completely accurate under all conditions. Additionally, the number of molecules may vary depending on factors such as temperature and pressure. However, for practical purposes and standard conditions, this calculation provides a reasonable estimate of the number of molecules in the given volume of oxygen gas.

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