For your experiment in part B, which factors would you keep constant?
Heating Different Amounts of a Substance

The color of the indicator will correspond to the pH values of either acidic or basic substances.

pH values are values which are obtained from taking the negative logarithm to base ten of the hydrogen ions concentration of a substance.

pH values of acidic substances are less than 7 while the pH of basic or alkaline substances are greater than 7.

An indicator is an organic dye which changes colour according to the pH of a substance.

Examples of indicators are methyl orange and phenolphthalein.

Therefore, the color of the indicator will correspond to pglh values of either acidic or basic substances.

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[tex]2 HCl + Mg(OH)_2[/tex] → [tex]2 H_2O + MgCl_2[/tex]

[tex]3 Ca(ClO)_2[/tex] → [tex]2 CaCl_2[/tex] + [tex]Ca(ClO_3)_2[/tex]

[tex]2 KBr + Ca(NO_3)_2[/tex] →[tex]2 KNO_3 + CaBr_2[/tex]

[tex]2Al +6HCl[/tex] → [tex]2AlCl_3 +3H_2[/tex]

[tex]2C_2H_6+7O_2[/tex] → [tex]4CO_2+6H_2O.[/tex]

A balanced chemical reaction is an equation that has equal numbers of each type of atom on both sides of the arrow.

Balanced chemical equation:

[tex]2 HCl + Mg(OH)_2[/tex] → [tex]2 H_2O + MgCl_2[/tex]

[tex]3 Ca(ClO)_2[/tex] → [tex]2 CaCl_2[/tex] + [tex]Ca(ClO_3)_2[/tex]

[tex]2 KBr + Ca(NO_3)_2[/tex] →[tex]2 KNO_3 + CaBr_2[/tex]

[tex]2Al +6HCl[/tex] → [tex]2AlCl_3 +3H_2[/tex]

[tex]2C_2H_6+7O_2[/tex] → [tex]4CO_2+6H_2O.[/tex]

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David runs a 100-m dash while pushing a stroller with a force of 25N.  The work done by David is 2500 Nm.

Force is a power that changes the motion of the object.

The displacement is 100 m

The force is 25 N

Work done = force x displacement

25 x 100 = 2500 Nm

Thus, the work done by David is 2500 Nm.

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From the Dalton's law of partial pressures, the pressure of the hydrogen gas is 91.83 kPa.

In a mixture of gases, the total pressure is the sum of the pressures of the individual gases in the mixture according to the Dalton's law of partial pressures.

In this case, the partial pressure of the hydrogen gas is Phydrogen, the partial pressure of water is Pwater and the total pressure is PT.

Hence;

Phydrogen = PT - Pwater

95 - 3.17 = 91.83 kPa

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Answer: Tree and Grass are the two correct answers here

Explanation:  Producers are photosynthesizing organisms. They are any kind of green plant that make their food by taking sunlight and using the energy to make sugar.

Answer:

Tree, grass

Explanation:

Producers make their own food. Trees and grass can make their own food using sunlight (photosynthesis). Monkey is consumer (eats other things like bananas- made by plants - for survival). Mold (like fungus) eat dead stuff and thus are decomposers (not producers).

HCl(acid)+C₄H₈ (butene)⇒ addition reaction

name of the product: 2-cloro butane

Answer:

.0987 moles

Explanation:

Ideal gas law     PV = n RT       R = .082057 L-atm/mol-K

7 ( .347) = n (.082057) (300)       n = .0987 moles

A tightly sealed jar will form liquid and water equilibrium but the drinking glass will not.

The liquid and water vapor establish equilibrium in a tightly sealed container but not in the drinking glass because in the tightly sealed jar, the water can't go into the atmosphere but in the drinking glass the water will evaporate.

So we can conclude that a tightly sealed jar will form liquid and water equilibrium but the drinking glass will not.

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[tex]2\text{Ca} + \text{O}_2 \rightarrow 2\text{CaO}[/tex]

Answer:

2.2 moles H2O

Explanation:

[tex]35g O_2 \mbox{ \cdot }\frac{1mol}{32g/mol} \mbox{ \cdot }\frac{2mol H_2O}{1mol O_2}= 2.1875[/tex], which rounds to about 2.2

According to the research, the body systems work together to perform a common function through the coordination of endocrine substances and nerve impulses.

They are the different sets of organs that make up the body, collaborating in each case with the fulfillment of some specific type of functions.

This simultaneous and juxtaposed set of systems involves various organs, ducts, tissues and various glands, all coordinated by endocrine substances and nerve impulses, so as to operate more or less autonomously as the case may be.

Therefore, we can conclude that according to the research, the body systems work together to perform a common function through the coordination of endocrine substances and nerve impulses.

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Answer:

D. K3PO4

Explanation:

K3PO4 would dissolve into 3 potassium ions and one phosphate ions thus total of 4 items added in water. Freezing point is depressed by high amounts of stuff. NaCl would add 2 items (one Na and one Cl). Glucose would not break apart, thus 1 item. MgCl2 would break into One Mg and two Cl ions (thus 3 things.)..

Overall, K3PO4 dissolves into most components, thus would depress the freezin point most.

Using the ideal gas equation and Gay Lussac's law, the volume of the passenger's collapsed bottle after landing is 0.0075 L.

The ideal gas equation shows the relationship between temperature, pressure, volume and number of moles.

The volume of the passenger's collapsed bottle after landing is 0.0075 L.

Given that;

PV = nRT

n = PV/RT

Hence:

P = 0.75 atm;

V = 0.5 L;

T = 295 K;

R = 0.082 atmL/K.mol

n = 0.75 * 0.5 / 0.082 * 295

n = 0.015 moles

If the pressure after landing was 1.0 atm;

V1n1 = V2n2

V2= V1n1/n2

V2 = 0.5 L *  0.015 moles/ 1 mole

V2 = 0.0075 L

The volume of the passenger's collapsed bottle after landing is 0.0075 L.

Missing parts;

A passenger on an airplane finished a 0.5 L bottle of water during the flight

and replaced the lid. The cabin pressure and temperature were maintained at

0.75 atm and 295 K during the flight. After landing, he noticed his empty water

bottle had collapsed. (12 points)

i. How many moles of gas were in the water bottle?

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The element that can bond with titanium (Ti) to form a polar covalent bond is Nitrogen (N).

In this type of bond, the atoms of the element share only one electron. As an example, we can mention the chlorine gas Cl2, in which the two chlorine atoms share an electron to achieve chemical stability.

Hence, we can see that to bond with Titanium, there needs to be an element that would form a polar covalent bond and this is Nitrogen and this is because of their electronegativity difference.

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Answer:

the first question's answer is 10.7g and the follow up question is 47.7g.

Explanation:

it makes you drag the object onto the scale and then displays it on the green rectangle.

One mole Hydrogen need 1/2mol O_2 .

Moles of Hydrogen

Moles of O_2

[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]

Let's get to the reaction first ~

[tex] \qquad \qquad \rm 2H_2 + O_2 \rightarrow 2H_2O[/tex]

Here, we can infer that if we need 1 mole oxygen gas to react with 2 moles Hydrogen gas.

So, the number of Oxygen gas molecules we need to react should be half the number of Hydrogen gas molecules.

Number of Hydrogen gas molecules is :

[tex]\qquad \sf  \dashrightarrow \: \dfrac{30}{2} [/tex]

[tex]\qquad \sf  \dashrightarrow \: 15[/tex]

Number of Oxygen gas molecules needed is :

[tex]\qquad \sf  \dashrightarrow \: \dfrac{15}{2} [/tex]

Number of Oxygen atoms needed :

[tex]\qquad \sf  \dashrightarrow \: \dfrac{15}{2} \times 2[/tex]

[tex]\qquad \sf  \dashrightarrow \: {15} \: atoms[/tex]

One atom of Oxygen weight 16 u, so 15 atoms weight ~

[tex]\qquad \sf  \dashrightarrow \: {15} \times 16[/tex]

[tex]\qquad \sf  \dashrightarrow \: 240 \: u[/tex]

So, we need 240 u of Oxygen atoms to react completely with 30 u of Hydrogen atoms.

Answer:

acceleration

learnt this in 8th grade

acceleration

Newton's second law : F = m.a

F proportional to m and a

F > than a >

Answer:

750 g of phosphorus is 750 g of phosphorus

Answer:

I didn't draw this but I think they're asking you to draw this

Explanation:

Ion particles are present in water solutions of electrolytes while neutral molecules are present in case of non electrolytes.

Electrolytes are compounds that dissociate into ions when dissolved in a solution, resulting in the solution becoming conductive to electricity. These substances are usually made up of ionic compounds or acids that dissolve in water, producing positively and negatively charged ions. These ions can move freely within the solution and transport electric charge, thereby transforming the solution into a conductor of electricity.

When we talk about water solutions of electrolytes, it's important to note that the solute particles are present in the form of ions. These ions are essentially atoms or molecules that have a net electric charge as a result of gaining or losing electrons. The presence of these charged particles allows for conductivity within the solution, making them capable of carrying an electric charge. Some common examples of electrolytes include table salt (also known as sodium chloride), acids, and bases.

When it comes to solutions in water that contain non-electrolytes, the solute particles are made up of neutral molecules or compounds that lack an overall electric charge and therefore, cannot facilitate electrical conductivity within the solution. Sugar, alcohol, and urea are a few examples of non-electrolytes.

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Answer: The butterfly effect

Explanation:

Answer:

A certain portion of the land will be set aside as wildlife habitat

Answer:

frequency

Explanation:

because a wave is equally a frequency

Atoms are the unit of the molecule of the compound. The 3.01 x 10²⁴  atoms of oxygen are present in 5 moles of water and 3 moles of carbon dioxide in the sample.

Atoms are the smallest fundamental unit of the compounds that can be given by Avogadro's number.

For calculating the oxygen atoms in 5 mole water:

If 1 mole = 6.02 × 10²³

Then, 5 moles = 5 ×  6.02 × 10²³

Hence, 3.01 x 10²⁴ atoms of oxygen are present in 5 moles of water.

Moles of carbon dioxide in the sample is calculated as:

If 1 mole of carbon dioxide = 6.02 × 10²³ molecules

Then moles in 1.8 x 10²⁴ molecules will be,

(1.8 x 10²⁴ molecules) ÷ (6.02 × 10²³ molecules)  = 3 moles

Hence, 3 moles of carbon dioxide is present in the sample.

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Answer:

-

Explanation:

As the piece of metal skitters across the surface of the water in a beaker and — particularly in the case of potassium — it appears to catch fire, it is not obvious that the explanation for both phenomena lies in the production of hydrogen gas.

Answer:

Polar molecules occur when there is an electronegativity difference between the bonded atoms. Nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each other out.

Explanation:

hope it's helps

The error in the student's reasoning happened as they get confused between the beta minus decay and beta plus decay.

A neutron is converted into a proton in beta minus, increasing the atomic number of the atom.

In the given question beta minus decay is not occur as atomic number of the daughter nuclei does not increases. Rather than this in the given decay atomic mass of the daughter nuclei is less than the parent nuclei means plus beta decay is happened there.

Hence the error is in predicting the correct particle with charge.

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