When vinegar and baking soda are combined bubbles begin to form. Bubbles are evidence of a chemical reaction because they

Answer:

84.23×10^23

Explanation:

no.of atoms =given wt / gram Mw×avagdro num

Answer:

An independent variable is defines as the variable that is changed or controlled in a scientific experiment. It represents the cause or reason for an outcome. Independent variables are the variables that the experimenter changes to test their dependent variable.

Explanation:

:)

Heres some defs-    a variable (often denoted by x ) whose variation does not depend on that of another. The independent variable is the variable the experimenter changes or controls and is assumed to have a direct effect on the dependent variable. ... The dependent variable is the variable being tested and measured in an experiment, and is 'dependent' on the independent variable.

Answer :

(A) The balanced chemical reaction will be:

[tex]2KBr(aq)+Cl_2(g)\rightarrow 2KCl(aq)+Br_2(l)[/tex]

This reaction is a single replacement reaction.

(B) The balanced chemical reaction will be:

This reaction is a double displacement reaction.

(C) The balanced chemical reaction will be:

[tex]N_2(g)+3H_2(g)\rightarrow 2NH_3(g)[/tex]

This reaction is a combination reaction.

Explanation :

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of an element present on reactant side must be equal to the product side.

Part (A):

The balanced chemical reaction will be:

[tex]2KBr(aq)+Cl_2(g)\rightarrow 2KCl(aq)+Br_2(l)[/tex]

This reaction is a single replacement reaction in which the most reactive element displaces the least reactive element from its solution.

Part (B):

The balanced chemical reaction will be:

[tex]CaBr_2(aq) +H_2SO_4(aq)\rightarrow  CaSO_4(s)+2HBr(g)[/tex]

This reaction is a double displacement reaction in which a positive cation and a negative anion of two reactants exchange their places to form two new products.

Part (C):

The balanced chemical reaction will be:

[tex]N_2(g)+3H_2(g)\rightarrow 2NH_3(g)[/tex]

This reaction is a combination reaction in which the two atoms combine to form a larger molecule.

Answer:

CCCCCCCCCCCCCCCCCCCC THATS THE ANSWER

Explanation:

Answer:

B. The hot water mixes all through the vial

Explanation:

The hot water is able to mix all through the vial because when water is heated, it's molecule are loosed. They are able to speed up and spread, occupying a larger volume. Hot water is less dense than room-temperature water and the hot water can float on room-temperature water.

Answer:

B. Iron

Explanation:

It is element number 26 on the periodic table.

Answer:

Iron is an element because it is a pure substance, air is a mixture, salt and sugar are compounds.

Answer:

They differ in the available amount and rate they are used and replaced.

Explanation:

If one material is replaceable, then it's renewable. If it's not replaceable, then it's non-renewable.

The statement 'they differ in the available amount and rate they are used/replaced' provides an explanation of how renewable and nonrenewable resources differ.

Renewable resources can be defined can natural resources that can be renowned in nature in a given period of time.

In conclusion, the statement 'they differ in the available amount and rate they are used/replaced' provides an explanation of how renewable and nonrenewable resources differ.

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Answer: The answer is “ By dissolving the same number of nmoles of each substance in the same volume of water ”

Explanation:

By dissolving the same number of moles of each substance in the same volume of water. Hence, option D is correct.

Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution.

Adding water to a solution and the number of moles of the solvent stay the same while the volume increases.

If there is no flow of solute into or out of the volume during the addition of the solvent, the number of moles of solute remains the same.

Hence, option D is correct.

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Answer:

Empirical formula = [tex]\mathbf{C_{10}H_{12}N_{2}}[/tex]

Molecular formula = [tex]\mathbf{C_{20}H_{24}N_{4}}[/tex]

Explanation:

From the given information:

we need to estimate the mass of carbon C in 1.321 g of [tex]CO_2[/tex]

before that, the number of moles of C is:

[tex]C = 1.321 \ g \times \dfrac{1 \ mol \ CO_2}{44/010 \ g \ of \ CO_2}[/tex]

c = 0.03002 mol

we know that:

number of moles = mass/ molar mass

mass = number of moles × molar mass

mass = 0.03002  × 12.011g of C

mass of C = 0.3606 g

Similarly; for hydrogen

the number of moles of H = [tex]0.325 g \ of \ H_2O \times \dfrac{ 1\ mol \ H_2O}{18.02g \ of \ H_2O}\times \dfrac{2 \ mole \ of H }{1 \ mol \ H_2O }[/tex]

the number of moles of H = [tex]0.325 g \ of \ H_2O \times \dfrac{2 \ mole \ of H}{18.02g \ of \ H_2O}[/tex]

the number of moles of H = 0.0361 mol of H

mass of H = [tex]0.0361 \ mol \ of \ H \times \dfrac{1.008 g \ of \ H}{ 1 \ mol \ of \ H}[/tex]

mass of H  = 0.0364 g

The mass of N will therefore be the difference the sample burnt with the mass of carbon and hydrogen.

i.e

mass of N = 0.487 g - 0.3606 of C - 0.0364 g of H

mass of N = 0.0900 g

however, the number of moles of nitrogen  = mass/ molar mass

the number of moles = 0.0900 g /14.007 g

the number of moles of nitrogen = 0.00643 mol

Thus, the formula is:  [tex]\mathsf{C_{0.03002}H_{0.0361}N_{0.00643}}[/tex]

If we divide by the smallest number (0.00643); we have:

[tex]\mathsf{C_{\dfrac{0.03002}{0.006432}}H_{\dfrac{0.0361}{0.00643}}N_{\dfrac{0.00643}{0.00643}}}[/tex]

= [tex]\mathsf{C_{4.7}H_{5.7}N}[/tex]

Thus, multiplying the subscript by 2.1,  we have:

 [tex]\mathsf{C_{4.7 \times 2.1}H_{5.7 \times 2.1}N_{1\times 2.1}}[/tex]

Thus, the empirical formula = [tex]\mathbf{C_{10}H_{12}N_{2}}[/tex]

The mass of the empirical formula is:

= (10 × 12.010 u) + (12 × 1.008 u) + ( 2 × 14.007 u)

= 160.21 u

Thus, because the molecular mass 324 g/mol is double the value of the empirical formula, the molecular mass is definitely double the empirical formula;

i.e

Molecular formula = [tex]\mathbf{C_{10\times 2}H_{12\times 2}N_{2\times 2}}[/tex]

Molecular formula = [tex]\mathbf{C_{20}H_{24}N_{4}}[/tex]

a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

A compound is a material formed by chemically bonding two or more chemical elements. The type of bond keeping elements in a compound together may vary: covalent bonds and ionic bonds are two common types. The elements are always present in fixed ratios in any compound.

Chemical element, also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.

is a material made up of two or more different substances which are physically combined.

A chemical formula identifies each constituent element by its chemical symbol and indicates the proportionate number of atoms of each element. I

A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen.

hope this help!

Answer:

Here are the definitions of all of them.

Explanation:

Molecule:

a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

Compound:

A compound is a material formed by chemically bonding two or more chemical elements. The type of bond keeping elements in a compound together may vary: covalent bonds and ionic bonds are two common types. The elements are always present in fixed ratios in any compound.

Element:

Chemical element, also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.

Mixture:

is a material made up of two or more different substances which are physically combined.

Chemical Formula:

A chemical formula identifies each constituent element by its chemical symbol and indicates the proportionate number of atoms of each element. I

Pure substance:

A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen.

Answer:

electron geometry

Tetrahedral for N F 3

Arrangement of bonding and non-bonding electron domains

molecular geometry

Trigonal pyramidal for N F 3

Arrangement of only the atoms in a molecule

Explanation:

According to valence shell electron pair repulsion theory, the shape of a molecule is determined by the number of electron pairs on the valence shell of the central atom in the molecule.

The electron pair geometry refers to the arrangement of bonding and non-bonding electron domains. For NF3, the electron geometry is tetrahedral.

The molecular geometry refers to the arrangement of only the atoms in a molecule. For NF3, the molecular geometry is trigonal pyramidal.

NF₃ has different geometry as per the arrangements of electrons. Tetrahedral and Trigonal bipryamidal are the two geometries.

The shape of a molecule is determined by the number of electron pairs on the valence shell of the central atom in the molecule.

Electron geometry

Tetrahedral for NF₃

Arrangement of bonding and non-bonding electron domains

Molecular geometry

Trigonal pyramidal for NF₃

Arrangement of only the atoms in a molecule

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Given parameters:

Heat of fusion of water  = 334j/g

Mass of ice  = 45g

Temperature of ice =  0.0°c

Unknown:

Amount of heat needed to melt = ?

Solution:

This is simply a phase change and a latent heat is required in this process.

  To solve this problem; use the mathematical expression below;

             H  = mL

where m is the mass

            L is the heat of fusion of water;

              H  = 45 x 334  = 15030J

Answer:

conduction

Explanation:

The type of heat transfer is Oliver experiencing is Conduction.

Heat transfer takes place in three modes,

1. Conduction

2. Convection

3. Radiation

1. Conduction :

Heat energy is transferred through the mechanism of conduction when nearby atoms or molecules collide. In solids and liquids, where particles are more closely spaced, conduction happens more easily than in gases, where particles are more widely spaced.

2. Convection :

Heat is transferred through convection, which is the large-scale movement of molecules inside gases and liquids, fluid motion is responsible for the bulk of the heat transfer.

3. Radiation :

The energy that emanates from a source and moves through space at the speed of light is referred to as radiation.

When Oliver arrives at the beach to meet his friend Farah, the sand feels hot and burns his bare feet as the heat is trapped in the sand and the heat is transferred to Oliver's feet by Conduction.

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Answer:

Dublin is warmed by ocean currents.

Explanation:

Got it right on test

Answer:

B.  Dublin is warmed by ocean currents.

Explanation:

Explanation:

Sr(OH)2 + H3PO4 = Sr3(PO4)2 + H2O - Chemical Equation Balancer.

Answer:

3Sr(OH)2 + 2H3PO4 → Sr3(PO4)2 + 6H2O

Explanation:

please check the image for accurate answer

Answer:

b solution

Explanation:

Answer: Newtons Second Law states that acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated), the greater the amount of force needed to accelerate the object (bullet in our case). Everyone inherently knows that heavier objects require more force to move the same distance as lighter objects.

Explanation:

Answer:

Independent variable: BROOM

Dependent variable: ACCELERATION

Control variable: same distance

Find the definition of replicate below

Explanation:

In an experiment, the independent variable is the variable that is changed or manipulated by the experimenter. In this case, the independent variable is the BROOM.

The dependent variable is the variable that is measured in an experiment. It is the variable that responds to the independent variable. The ACCELERATION is the dependent variable in this case.

The control variable is the variable that is kept constant or unchanged throughout the experiment. In this case, the control variable is the SAME DISTANCE traveled for each broom.

A replicate is a repeated experiment with the expectance of a similar or consistent result. In this case, if the brooms are switched, the acceleration of each broom should be the same in the replicate result.

Answer:

The new volume of gas is 25.7 L.

Explanation:

Given data:

Initial volume = 24.0 L

Initial pressure = 10.0 atm

Initial temperature = 200 K

Final temperature = 300 K

Final volume = ?

Final pressure = 14.0 atm

Formula:  

P₁V₁/T₁ = P₂V₂/T₂  

P₁ = Initial pressure

V₁ = Initial volume

T₁ = Initial temperature

P₂ = Final pressure

V₂ = Final volume

T₂ = Final temperature

Solution:

V₂ = P₁V₁ T₂/ T₁ P₂  

V₂ = 10.0 atm × 24.0 L × 300K / 200 K × 14.0 atm

V₂ = 72000 atm .L. K / 2800 K.atm

V₂ = 25.7 L

The new volume of gas is 25.7 L.

Answer:

See detailed explanation.

Explanation:

Hello.

In this case, since the electron configuration of potassium whose atomic number is 19 turns out:

[tex]K^{19}: 1s^2,2s^2,2p^6,3s^2,3p^6,4s^1[/tex]

We can see that the last level is 4 which has one electron, meaning that potassium has one valence electron. Moreover, since bromine's atomic number is 35, its electron configuration is:

[tex]Br^{35}: 1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^{10},4p^5[/tex]

We can see that the last level is also 4 and it has 2+5 = 7 valence electrons. In such a way, we infer that the valence electrons are computed by the electrons at the outer or last energy level of an element.

Regards.

Answer:

7

Explanation:

Answer:

Thermal Insulators

That's because air, like other gases, is a poor conductor of thermal energy. The particles of gases are relatively far apart, so they don't bump into each other or into other things as often as the more closely spaced particles of liquids or solids

Explanation:

Answer:

Distillation

Explanation:

By using the method of distillation we'll identify if there is other properties of liquid by looking the temperatures,the ordor or the boiling point.

Answer:

Explanation:

In order to find the original volume we use the same for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we are finding the original volume

[tex]V_1 = \frac{P_2V_2}{P_1} \\[/tex]

From the question

P1 = 172 kPa = 172000 Pa

P2 = 85 kPa = 85000 Pa

V2 = 3 L

We have

[tex]V_1 = \frac{85000 \times 3}{172000} = \frac{255000}{172000} = \frac{255}{172} \\ = 1.482558139...[/tex]

We have the final answer as

Hope this helps you

Answer:

[tex]u=4.57x10^5GHz[/tex]

Explanation:

Hello.

In this case, given the formula:

[tex]E=h*u[/tex]

Whereas E is the energy, h the Planck's constant and u the frequency of the photon. Thus, solving for it, we obtain:

[tex]u=\frac{E}{h}=\frac{3.03x10^{-19}J}{6.63x10^{-34}J*s}\\ \\u=4.57x10^{14}s^{-1}[/tex]

Or also:

[tex]u=4.57x10^{14}Hz*\frac{1GHz}{1x10^9Hz}\\ \\u=4.57x10^5GHz[/tex]

Best regards.

The elements in a group containing similar physical properties are

Pair 1 -- K and Li

Pair 2 -- S and Te

Pair 3 -- Br and F

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