Juno, Melissa, and Anna have skateboards that are the same mass. They were playing with their skateboards on a flat street when another skateboard came along and bumped their skateboards, but not from the same direction. Each skateboard changed speed as a result of being bumped. Use the information in the diagram to answer. Which skateboard(s) experienced the strongest force when bumped? How do you know?

Answer:

The above equation follows law of conservation of mass.

Explanation:

Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.

This also means that total mass on the reactant side must be equal to the total mass on the product side.

The chemical equation for the decomposition of calcium carbonate follows:

CaCO_3\rightarrow CaO+CO_2CaCO3→CaO+CO2

We are given:

Mass of calcium carbonate = 100 grams

Mass of calcium oxide = 56 grams

Mass of carbon dioxide = 44 grams

Total mass on reactant side = 100

Total mass on product side = 56 + 44 = 100 g

Hence, the above equation follows law of conservation of mass.

The amount of stock solution that would be needed to prepare the required solution would be 0.06 L.

The problem can be solved using the dilution principle. According to this principle, before and after diluting a particular solution, the number of moles of solutes in the solution must remain the same.

The dilution principle is expressed as an equation as shown below:

[tex]m_1v_1[/tex] = [tex]m_2v_2[/tex]

Where:

[tex]m_1[/tex] = molarity before dilution (in this case, 13%)

[tex]v_1[/tex] = volume before dilution (what we want to determine)

[tex]m_2[/tex] = molarity after dilution (in this case, 0.5%)

[tex]v_2[/tex] = volume after dilution ( in this case, 1.6 L)

Using the provided information, the volume of the stock solution to be taken can be calculated as follows:

[tex]v_1[/tex] =  [tex]m_2v_2[/tex]/[tex]m_1[/tex]

    = 0.5 x 1.6/13

    = 0.06 L

In other words, 0.06 L of the stock solution would be required. This volume will be diluted to the 1.6 L mark with water in order to have the desired solution.

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Someone who is suffocating will have a higher concentration of volatile class of acids.

These are essentially the saprophytes waste materials. Short-chain fatty acids like acetic, propionic, and butyric acids are some of these waste products. Because they can be distilled at atmospheric pressure, these substances are known as volatile acids.

Chemical substances that quickly vaporize are called volatile acids. The high vapor pressure at standard room temperature causes this quick evaporation. As a result, volatile acids can vaporize without the use of heat or any other external force.

HCl has the lowest boiling point and is the most volatile.

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Take 0. 4h NaOH in a beaker. Dissolve it Hilly by adding a touch amount of water. Then, once more add water to make it 100ml.0.1 mole of NaOH is present in the 1. 0 L.

Sodium hydroxide is a corrosive white crystalline stable and when diluted in a 50% solution can neutralize acids in diverse commercial strategies. it may additionally be used to fabricate many ordinary merchandises, including paper, aluminum, business drain, oven cleaners, and soap and detergents.

Sodium hydroxide, also known as lye and caustic soda, is an inorganic compound with the system NaOH. it's miles a white solid ionic compound such as sodium cations Na⁺ and hydroxide anions OH⁻.

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From the equation, MgSO₄ is the limiting reagent and the mass of Magnesium Hydroxide produced is 48.3g.

It is given that the mass of MgSO₄ is 100g and the mass of Sodium Hydroxide is 70g. Then the number of moles of Magnesium Sulfate and Sodium Hydroxide is given by,

Moles of MgSO₄ = 100/120

Moles of MgSO₄ = 0.833 mol

Moles of NaOH = 70/40

Moles of NaOH = 1.75 mol

It is given that 1 mol MgSO₄ needs 2 mol of NaOH, then 0.833mol of MgSO₄ needs 2x0.833 mol of NaOH which is given by 1.67mol. This is less than 1.75 mol of NaOH.

Thus, MgSO₄ is the limiting reagent. To find the mass of Magnesium Hydroxide the following steps are to be taken,

1mol of MgSO₄ forms 1mol of Magnesium Hydroxide

Then 0.833mol of MgSO₄ forms 0.833mol of Magnesium Hydroxide

Therefore, the mass of Magnesium Hydroxide is the product of moles and molar mass which is given by,

Mass of Magnesium Hydroxide = 0.833x58

Mass of Magnesium Hydroxide = 48.3g

Therefore the mass of Magnesium Hydroxide is 48.3g

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Answer:

Explanation:

Equation for the reaction ;

AgNO3 + HCl → AgCl + HNO3

Since AgNO3 is taken in excess, the limiting reactant/agent here is HCl.

Concentration (molarity) of HCl = 0.110 M

Amount of HCl in 1 litre (1000 mL) solution = 0.110 mol

Amount of HCl in 50 mL = (0.110 x 50)/1000 = 0.0055 mol

As per the reaction equation, the consumption of HCl and the formation of AgCl are in the molar ratio 1 : 1.

Moles of AgCl formed = moles of HCl used = 0.0055

Molar mass of AgCl = 107.8 + 35.5 = 143.3 g/mol

The grams solutes ini 835 mL of 0.390 M KBr is 38.75 g.

The grams can be calculated as follows:

The first you should calculate the molar

Times the molar of KBr by its valume to get moles

n = Molar x volume

n = 0.390 M x 0.835L

n = 0.32565 moles

thus, you should calculate molar mass so you can calculate the gram

Mass of potasium = 39.10 g/mol

Mass of Bromine = 79.904 g/mol

mass molar = 39.1 g/mol+79.9 g/mol = 119 g/mol

The next step is calculate the gram by time the moles to  its mass molar

gram = n x mass molar

gram = 0.32565 moles x 119 g/mol= 38.75 g.

so, The grams solutes ini 835 mL of 0.390 M KBr is 38.75 g.

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Through a stronger attraction of electrons, a greater nuclear charge reduces energy.

The outside of the nucleus is surrounded by electrons, which are negatively charged particles. Scientists may have trouble observing them since they rotate so quickly. The tiniest particles in an atom, with 2000 of them fitting into a proton, they are drawn to the protons' positive charge.

The negatively charged atom's electrons are responsible for this. An atom's total negative charge, which is produced by all of its electrons, counteracts the positive charge of the protons inside the atomic nucleus. In comparison to all the other atom's constituents, electrons are quite tiny.

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To solve such this we must know the concept of chemical reaction. Therefore the correct option is option C that is the properties and identity of the reacting substances.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

A change in the properties and identity of the reacting substances means that a chemical reaction has occurred.

Therefore the correct option is option C.

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0.085 moles of Al are required to form 23.6 g of AlBr₃.

Solution:

2 Al(s) + 3 Br₂ (1) → 2 AlBr3?

23.6 x [tex]\frac{1mol}{266.69g} = 0.885mol[/tex]

The molar ratio of Al to AlBr 3 is as follows. is 2:2. The amount required to form 0.0885 moles of AlBr 3 is 0.0885 moles. The molar Al required is:

[tex]0.885molAlbr_{3} * \frac{2ol Al}{2molAlbr_{3}} = 0.085molAl[/tex]

0.085 moles of Al are required to form 23.6 g of AlBr₃.

Aluminum bromide is formed by a redox reaction in which aluminum is reduced and bromine is oxidized. The product of this reaction is the neutrally charged ion AlBr3. Aluminum chloride is a neutral ionic compound consisting of aluminum ions and chloride ions. The total charge of aluminum chloride is zero. Aluminum chloride is covalent because the aluminum ion has a high charge density and the chloride ion is relatively polarizable.

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The mass of water initially present in the system containing water and ice is 8 grams

We'll begin by obtaing the mass needed to melt the ice. This is shown below:

Q = m × Hf

1330 = m × 333

Divide both sides by 333

m = 1330 / 333

m = 4 g

Finally, we shall determine the mass of water. This can be obtained as follow:

Mass of water = (Mass of ice and water) - (Mass of ice)

Mass of water = 12 - 4

Mass of water = 8 grams

Thus, the mass of water is 8 grams

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Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. Therefore, by loosing 2 electron calcium become Ca²⁺ ion.

Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc. Therefore, by loosing 2 electron calcium become Ca²⁺ ion.

Cation is the species that loose electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.

Electronic configuration of calcium is [Ar] 4s². So to make it Ca²⁺ ion, we need to remove two electron from 4s² by providing suitable ionization energy.

Therefore, by loosing 2 electron calcium become Ca²⁺ ion.

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The concentration of acetic acid in the initial solution is 0.267M

Concentration is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution

Here given data is

Acetic acid = 35.00 mL

8.75 mL of 0.0500 M Sr(OH)₂ for its neutralization

We have to calculate concentration of acetic acid in the initial solution = ?

So the reaction is

CH₃CO₂H + NaOH → CH₃CO₂Na + H₂O

That means the moles of NaOH added = moles acetic acid in the solution

So, to solve this problem we need to find the moles of NaOH added to find the mole of acetic acid and its concentration using its volume as follow

Moles of NaOH

18.75 mL = 0.01875 ×(0.0500mol/L) = 0.009375 mole of NaOH = mole of acetic acid

So the molarity of acetic acid =  0.009375 mole /0.035L = 0.267M

So the concentration of acetic acid in the initial solution is 0.267M

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The  vibrations of different parts of a molecule when that molecule is exposed to IR light are:

When a molecule is exposed to IR radiation, it will take in the rays that have the same frequency as one of its bonds vibrating. The bond can vibrate a little bit more thanks to the absorbed IR radiation, increasing the vibration's amplitude, but the vibration's frequency won't change.

When a molecule is exposed to infrared light of these frequencies, the molecule absorbs energy and is excited. When the molecule eventually returns to its initial (ground) state, the absorbed energy is released as heat.

Interatomic chemical connections in molecules have the ability to extend like springs. As a result, molecules absorb infrared light and vibrate because the energy associated with these stretching vibrations is similar to that of infrared light.

Therefore, the fact that molecules absorb particular frequencies that are distinctive to their structure is taken advantage of in infrared spectroscopy. These absorptions have resonance frequencies, meaning that the frequency of the radiation absorbed coincides with the frequency of the vibrating bond or group.

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The volume in liters of a 0.320M Mg(NO₃)₂ solution that contains 45.0g is 0.95L.

Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

Molarity can be calculated by dividing the number of moles of the substance by its volume as follows;

Molarity = no. of moles ÷ volume

no. of moles = 45.0g ÷ 148.3 g/mol

no of moles = 0.303mol

Volume = 0.303mol ÷ 0.320M

Volume = 0.95L

Therefore, 0.95L is the volume of the magnesium nitrate solution.

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In alpha decay, a helium nucleus is ejected from the nucleus. This removes 2 protons and 2 neutrons from the mother nucleus, thus reducing the mass number by 4 and the atomic number by 2. The daughter isotope is thorium 234, atomic number 90.

When the nucleus emits beta particles it loses electrons. The atomic mass of the mother nucleus is the same as that of the daughter nucleus since the mass of electrons is very small compared to the mass of protons and neutrons. The atomic number of the daughter nucleus is one higher than that of the mother nucleus.

In a nuclear decay reaction also called radioactive decay an unstable nucleus emits radiation and transforms into the nucleus of one or more other elements. The resulting daughter nucleus has lower mass and energy than the decaying parent nucleus. The atomic number and mass number of the daughter nucleus must be calculated by subtracting the atomic number and mass number.

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The formula of the hydrated compound based on the mole ratio is MoS.H₂O.

Hydrated salts are salts that contain water molecules in a molecule of the compound.

In hydrated compounds, a molecule of the compound combines with a given number of moles of water.

The formula of the hydrate is calculated as follows:

Mass percentage of the anhydrous compound, MoS = 86.7%

Moles of MoS = 86.7% / 128

moles of MoS = 0.68

Mass percentage of water is 13.3%

Moles of water = 13.3 / 18

moles of water = 0.74

Mole ratio is 1 : 1

Formula of compound is MoS.H₂O

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The Lewis structure shows the ways that electrons are bonded in a compound.

We define the Lewis structure as the diagram that shows the number of electrons and the bonds that are found in a compound. We know that electron pairs of the bond are shared between the bonding atoms and this is shown as a single dash.

The procedure for writing the Lewis structure are;

Draw the skeletal structure of the compound.

Draw a single bond between the central atom and each of the surrounding atoms.

Count the total number of valence electrons

Complete the octets of the atoms bonded to the central atom.

If the central atom has fewer than 8 electrons add double/triple bonds to the central atom, using lone pairs on outer atoms to complete the octet.

If negative charges are present, add them to the total. If positive charges are present, subtract them.

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The reflected light is responsible for the white cast often seen with mineral sunscreens, he says. The absorbed light gets radiated as heat.

They sit on the exterior of the skin and reflect UV rays away from your skin, “a lot like aegis or mirror would,” George says. Chemical absorbers: Chemical (or organic, meaning carbon-carry) sunscreen ingredients form a thin protective film that sucks up UV radiation before it penetrates the skin. Sunscreen works by blocking and mopping up UV rays through a combination of physical and chemical particles. Physical particles, such as zinc oxide and titanium dioxide, are used to mirror UV radiation from the skin sunscreen can either absorb UV rays or scatter them off your skin. Sunscreens that scatter UV light often contain titanium.

So we can conclude that  If you've been following sunscreen discourse (evidently this is a thing now) you'll know that mineral sunscreens mostly work by absorbing UV.

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The amount of potassium nitrate that can be dissolved in 200 g of water at  60°C is 101 gm/ml.

The solubility graph is a completely beneficial tool as it tells you the amount of potassium nitrate that may be dissolved consistent with

one hundred mL, of water on the way to have a saturated answer of potassium nitrate at a given temperature.

In an effort to discover the solubility of the salt at

60∘C, begin from the

60∘C

Mark on the graph and move up till you intersect the curve. on the factor of intersection, move left till you intersect the

the y-axis and study the cost that you land on.

In this situation, you could estimate that the solubility of potassium nitrate in water at

60∘C is the same as about

solubility ≈ a hundred and ten g / 100 mL water.

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1. The reactant is a white chalky solid salt while the one the product is an acidic gas while the other is a white crystalline basic solid.

2. Yes, the equation shows the conservation of matter.

3. The equation shows the conservation of matter because the mass of the reactant is equal to the mass of the products. Also, the number of moles of the elements involved in the reaction is conserved.

The law of the conservation of matter states that matter is neither created nor destroyed but can change from one form to another.

The law of conservation of matter is applied in chemical reactions.

For example, consider the reaction of the decomposition of calcium carbonate:

CaCO₃ (s) ----> CaO (s)  + CO₂ (g)

From the equation of the reaction;

1 mole of Ca atoms are present on the reactant and product side of the reaction.

1 mole of C atoms are present on the reactant and product side of the reaction.

3 moles of O atoms are present on the reactant and product side of the reaction.

Hence, the sum of the moles of reactants is equal to the sum of moles of products.

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Answer: C

Explanation:

[tex]2Li_3PO_4+3Co(OH)_2 = Ca_3(PO_4)_2_(5)+6LOH[/tex]  is a  double displacement  balanced equation reaction

To balance chemical equations, stoichiometric coefficients for the reactants and products are required. This is important because a chemical equation must follow the rules of conservation of mass and constant proportions, which dictate that the same number of atoms of each element must be avail on two of the reactant and product sides of the equation.

Chemical equations use the relevant chemical formulae to symbolically express the reactants and products of a chemical process. To the left of the sign "," and to the right of the arrow symbol, respectively, is the part of the chemical equation that is on the reactant side.

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Answer: Cl O3 F

Explanation:

Taking into account the definition of calorimetry, the mass of iron that must be added is 531.556 grams.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

When heat added or removed from a substance causes a temperature change in it without affecting its molecular structure, it is called sensible heat.

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing in the expression to calculate heat exchanges:

For iron: Qiron= 0.450 J/(g°C) × mass of iron× (65 °C - 100 °C)

For water: Qwater= 4.186 J/(g°C) × 50 g× (65 °C - 25 °C)

If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.

Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:

- Qiron = + Qwater

- 0.450 J/(g°C) × mass of iron× (65 °C - 100 °C)= 4.186 J/(g°C) × 50 g× (65 °C - 25 °C)

Solving:

15.75 J/g × mass of iron= 8372 J

mass of iron= 8372 J÷ 15.75 J/g

mass of iron= 531.556 grams

Finally, the mass of iron necessary is 531.556 grams.

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The hybridization of the central atom in each  specie are

a) sp

b) [tex]sp^3d^2[/tex]

c) [tex]sp^{3}[/tex]

d) [tex]sp^{3} d[/tex]

When we talk about hybridization we are talking about the way that there could be a mixing of two or more orbitals in such a way that an orbital that has sufficient energy can be used in the process of bonding.

Now we know that the orbitals that are used in the process of the bonding are those that can be able to be combined in such a way that the energy requirement of the bond is least.

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The hybridization states of each of the central atoms are;

a) BeH2- sp

b) SF6 - sp³d²

c) PO43 - sp³

d) PC15" - sp³d

The notion of hybridization is what is said about the mixing of the orbitals in order that one could attain the orbitals that have the kind of energy that is demanded so as to have s reaction.

For this reason, the hybridization of the central atom would amount to the shape of the molecule and this is crucial to know.

To determine the hybridization of the atoms of the compound above, count the number of atoms connected to it. Only the number of pairs attached to it. Add these two numbers together.

Then apply these numbers:

If it's 4, your atom is sp3.

If it's 3, your atom is sp2.

If it's 2, your atom is sp

Therefore, the correct answer is as given above

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