height of item (using side A)

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Answer:

When the sun's rays strike Earth's surface near the equator, the incoming solar radiation is more direct (nearly perpendicular or closer to a 90˚ angle). Therefore, the solar radiation is concentrated over a smaller surface area, causing warmer temperatures.

Explanation:

Answer:

Monoatomic ions:  Li⁺, Be²⁺, Cr²⁺, Pb²⁺, Cl⁻, O²⁻

Polyatomic ions:  H₃O⁺, OH⁻, SO₄²⁻, Hg₂²⁺

Explanation:

Polyatomic ions have more than one atom.  Monoatomic ions have only one atom.

Monoatomic ions are Li⁺, Cl⁻, Be²⁺, Pb²⁺, Hg₂²⁺, Cr²⁺, O²⁻and polyatomic ions are SO₄²⁻, OH⁻, ClO⁻, H₃O⁺

The species that is made up of only a single atom per ion is known as monatomic ion whereas polyatomic ions are composed of many atoms per ion. These ions can be either cations or anions. Both monatomic and polyatomic ions can form ionic compounds by having electrostatic attractions with the ions of opposite electrical charge.

Polyatomic ions are covalently bonded groups of atoms and having a positive or negative charge caused by the formation of an ionic bond with another ion.

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Answer:

Calcium

Explanation:

The symbol for the element with a mass number of 27 is actually Al for Aluminum instead of Co for Cobalt. Mass number refers to atomic mass, not atomic number.

Aluminum has an atomic mass of 26.982 or 27.

The letters to unscramble are I, M, C, Al, U, and C.

The mystery element is Calcium.

Hope that helps.

Taking into account the reaction stoichiometry, if 10.3 g of Ca(OH)₂ reacts, 5.01 grams of H₂O are formed.

The balanced reaction is:

2 H₃PO₄ + 3 Ca(OH)₂  → 6 H₂O + Ca₃(PO₄)₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 222 grams of Ca(OH)₂ form 108 grams of H₂O, 10.3 grams of Ca(OH)₂ form how much mass of H₂O?

mass of H₂O= (10.3 grams of Ca(OH)₂ ×108 grams of H₂O)÷ 222 grams of Ca(OH)₂

mass of H₂O= 5.01 grams

Finally, 5.01 grams of H₂O are formed.

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Answer: Infusion time is 5.5 h

Explanation:   Time is   470 ml / 85 ml/h =  5.5 h

Answer:

If the earth did not tilt on its axis we would not have 4 seasons, and it would be hooall the time since when we rotate around the sun the earth with become Hot all the way around.

Explanation:

Human activities have a tremendous impact on the carbon cycle. Burning fossil fuels, changing land use, and using limestone to make concrete all transfer significant quantities of carbon into the atmosphere. ... This extra carbon dioxide is lowering the ocean's pH, through a process called ocean acidification.

The arrow in a chemical equation represents the direction of the reaction. It indicates the conversion of reactants into products. The arrow points from the reactant side to the product side, symbolizing the flow of the reaction.

The purpose of the arrow is to visually represent the chemical transformation occurring in the reaction. It shows the relationship between the reactants and products and the direction in which the reaction proceeds. The arrow implies that the reactant molecules are being rearranged and transformed into new substances with different properties.

Chemical equations are used to describe the stoichiometry and balance of reactions. The arrow helps convey this information by illustrating the overall process taking place. It serves as a crucial element in understanding the reaction's composition, reaction conditions, and the substances involved.

Furthermore, the arrow also implies that the reaction can occur in both directions. In reversible reactions, the arrow can be represented as a double-headed arrow, indicating that the reaction can proceed in either direction depending on the conditions.

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Answer:

you need to multiply your number of half-lives by how many years are in one half-life. This gives you an age of 2 x 5730 = 11,460 years. Your fossil is of an organism (maybe human) that died 11,460 years ago

Explanation:

These are problems related to mixing different solutions to obtain a desired concentration.

Problem 1: 200 g of 17% solution, mix 100 g of 15% solution with 100 g of 20% solution.

Problem 2: 54 g of 18% solution and 246 g of 5% solution are needed.

Problem 3: The mass percentage of the final solution is (20015 + 35020) / (200 + 350) = 18.33%

Problem 4: The mass percentage of the final solution is (30015 + 35) / (300 + 35) = 13.23%

Problem 5: The mass percentage of the final solution is (40025) / (400 + 150) = 21.74%

Mass is a fundamental physical property of matter and is defined as the amount of matter that an object contains. It is usually measured in units of grams (g) or kilograms (kg). Mass is related to but different from weight, which is the force exerted on an object by gravity. In chemistry, mass is often used to express the amount of a substance in a sample or reaction.

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The manner in which the transfer of energy would be different if the bars were in an open system is as follows: Energy transfer would occur between the copper bars and the surroundings (option B).

The law of conservation of energy principle stating that energy may not be created or destroyed.

An isolated system exchanges neither energy nor matter with the surroundings. According to this question, two copper bars at different temperatures transfer energy until both are at the same temperature.

However, in an open system, some of the energy would be transferred to the surroundings.

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True. The principle of "safer solvents and auxiliaries" is one of the 12 principles of green chemistry.

This principle aims to reduce or eliminate the use of auxiliary substances, such as solvents and separation agents, in chemical processes whenever possible. The use of these substances can have negative environmental and health impacts, such as toxicity, flammability, and the production of waste.

Therefore, chemists should aim to find alternative, safer methods and materials that can replace or reduce the need for these substances. This can include using water as a solvent, which is a safer and more environmentally friendly option compared to organic solvents, or using catalysts to minimize the need for separation agents. By implementing this principle, chemists can help minimize the environmental impact of chemical processes and promote more sustainable practices.

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1 quart = 946 mL is an example of unit conversion in volume.

The unit conversion of a substance is the process through which the unit of the substance is converted from one form to another.

The expression 100 cm/1 m is called a conversion factor, and it is used to formally change the unit of a quantity into another unit.

For example, converting the volume of a substance from one unit to another, we make use of conversion factor such as 1 L/1000 mL, 1 m³/1,000,000 cm³, etc.

There different units in the volume of a substance or liquid is measured and they include the following;

The unit of volume can be converted from one unit to another as shown in the given example.

1 quart = 946 mL

Thus, we can conclude that 1 quart = 946 mL is an example of unit conversion in volume, from quart to milliliters.

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Answer:

23.1%

Explanation:

To find the weight percent (aka. mass percent), you need to use the following equation:

                                   mass of solute (g)
Weight Percent  =  ----------------------------------  x  100%
                                  mass of solution (g)

In this case, the solute is sugar and the solution is the sugar and water. You can find the weight percent by plugging the given values into the equation and solving. The final answer should have 3 sig figs like the given values.

mass of solute = 15.0 g

mass of solution = 15.0 g + 50.0 g = 65.0 g

                                   15.0 g solute
Weight Percent  =  -------------------------  x  100%
                                     65.0 g soln

Weight Percent  =  0.231  x  100%

Weight Percent  =  23.1%

Nitrogen G is a colorless, tasteless gas that is the most plentiful element in Earth's atmosphere and is a constituent of all living matter of nitrogen.

Nitrogen is an essential gaseous element with an atomic number of 7 and an atomic weight of 14.0067. Nitrogen gas has two particles of Nitrogen therefore, the molecular formula of this gas is N2. It is a non-metallic element that settled Group 15

nitrogen. [ nī′trə-jən ] N. A nonmetallic element that constructs up about 78 percent of the atmosphere by capacity, Nitrogen is a nonmetal and the lightest member of group 15 of the periodic table

So we can conclude that Nitrogen is the chemical element with the symbol N and atomic number 7.

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We must take into consideration the balance of atoms and charges in order to balance the half-reaction for the conversion of S2O3 2- to S4O6 2- in acidic solution.

Write the imbalanced half-reaction as the first step.

S2O3 S4O6 2- (aq)

Step 2: Align the atoms, with the exception of hydrogen and oxygen.

2S4O6 2-(aq) = S2O3 2-(aq)

Step 3: Add water (H2O) to balance the oxygen atoms.

2S4O6 2- (aq) + H2O = S2O3 2- (aq)

Step 4: Add hydrogen ions (H+) to balance the hydrogen atoms.

2S4O6 2- (aq) + H2O = S2O3 2- (aq) + 4H+ (aq)

Step 5: Add more electrons (e-) to balance the charge.

2S4O6 2- (aq) + H2O = S2O3 2- (aq) + 4H+ (aq) + 2e-

The balanced half-reaction in acidic solution is:

S2O3 2- (aq) + 4H+ (aq) + 2e- → 2S4O6 2- (aq) + H2O

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Exothermic refers to chemical interactions that aerobic respiration. Combustion reactions release higher energy. Endothermic refers to atoms and molecules that either use or absorb reactive power.

A chemical process known as an endothermic releases energy as heat or light. It is an endothermic reaction's opposite. Chemical equation expressed as reactants + products + energy. An reaction mechanism is one in which electricity is given off as light or warmth.

A response is deemed to be exothermic if it produces heat while also undergoing a net decrease in basic enthalpy change. Samples include those type of combustion, iron rust, including water froze. Exothermic processes are those that discharge heat and energy into the surroundings.

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As per the balanced reaction of Al and oxygen gas, 4 moles of Al needs 3 moles of oxygen gas. Hence, 7 moles of Al needs 5.2 moles of O₂.

Aluminum metal is more reactive towards oxygen and it forms oxides on its surface. The balanced chemical equation of the reaction between Al and oxygen is written as follows:

\(\rm 4 Al + 3O_{2}\rightarrow2 Al_{2}O_{3}\)

As per this reaction, 4 moles of aluminum needs 3 moles of oxygen molecule. Then, the number of moles oxygen molecule required to react with  7 moles of Al is :

no.of moles of O₂  = (7×3)/4 = 5.2

Therefore, 5.2 moles of oxygen gas is required to completely react with 7 moles of aluminum metal.

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A transformation of chemical energy to electrical energy occurs when there is a chemical reaction between metals and nonmetals.

The movement of electrons from one atom to another is what results in electrical energy.

A battery is a device that converts chemical energy contained within its active materials directly into electric energy by means of an electrochemical oxidation-reduction (redox) reaction. This type of reaction involves the transfer of electrons from one material to another via an electric circuit.

Hence, option C is correct.

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• An ion is a charged molecule or atom .

• If the atom has more protons than electrons, then we say it is a positively charged ion.

The best diagram to represent N2O is the second diagram.

The Lewis diagram is used to represent the way two or more atoms bond. This is possible by using lines to represent bonds and dots to represent electrons.

In the case of the molecule N2O bonding occurs in the following way:

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Answer:

l

Explanation:

Based on the action-reaction forces, the skateboard will most likely move towards west when she jumps off.

Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.

It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.

The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.

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The inorganic compound copper(II) sulfate, also referred to as copper sulphate, has the molecular formula CuSO4. Copper sulphate's aqueous solution has an acidic pH.

The following chemical equation describes the reaction between a CuSO4 solution as well as an iron nail. CuSO4+Fe→FeSO4+Cu. (a) Describe the reduction reaction that is occurring. (a) Explain why Cu was pushed out of the CuSO4 solution by Fe.

Water dissolves CuSO4 to produce Cu+2 and SO42. Since H+ ions are produced in this condition, this solution was slightly acidic, which causes its blue litmus paper to turn red.

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Answer:

so so

Explanation:

this your question?? <_>

Answer: D.

Explanation: I got it right and the dude above me is spreading fake news

Answer:

The value is \(k =66\%\)

Explanation:

From the question we are told that

The mass of toluene \( m_t =0.73 \ g \)

The mass of potassium permanganate is \( m =2.0 \ g \)

The volume of potassium hydroxide V = 7.0 mL

The concentration of potassium hydroxide C = 6 M

The mass of benzoic acid is \(m_b = 0.633 \ g\)

Generally the % yield of benzoic acid is mathematically represented as

\(k = \frac{m_b}{Z} * 100\)

Here Z is the theoretical yield which is mathematically represented as

\(Z = \frac{E}{W} * m_t \)

Here W is the molecular weight of product (benzoic acid) with value  

       W  = 92.14 \ g

E is the molecular weight of reactant (toluene)with a constant value  of  

    E =  122.12 g

So

     \(Z =  \frac{122.12 }{92.14}  *  0.73 \)

=>    \(Z = 0.968 \  g  \)

So

     \(k  =  \frac{0.633}{0.968}  * 100\)

=>   \(k  =66\%\)

The percent yield of the HF is 20%.

We can see that the equation of the reaction have been shown ere and that would give us a good start as we start to solve the problem.

Now;

Number of moles of the ammonia = 69.10 g/17 g/mol

= 4.1 moles

Number of moles of fluorine = 69.10/38 g/mol

= 1.8 moles

If 2 moles of ammonia gives 5 moles of fluorine

4.1 moles of ammonia would give  4.1 moles * 5 moles/2 moles

= 10.25 moles

Hence the fluorine is the limiting reactant

If 5 moles of fluorine gives 6 moles of HF

1.8 moles of fluorine gives  1.8 moles * 6 moles/5 moles

= 2.16 moles

Theoretical yield of the HF = 2.16 moles * 20 g/mol

= 43.2 g

Now percent yield= Actual/Theoretical * 100/1

=  8.630 g/43.2 g * 100

= 20%

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Answer: unlike, will not scatter

Explanation:

Colloids are unlike solutions because their dispersed particles are much larger than those of a solution. The dispersed particles of a colloid cannot be separated by filtration, but they scatter light, a phenomenon called the Tyndall effect.