Which of these is an example of a physical property?

A. Iron combines with oxygen to rust.

B. Potassium reacts in water to form a base.

C. Sodium metal is soft and malleable.

D. Sodium ignites when placed in water.​

Answers

Answer 1

Option C. Sodium metal is soft and malleable is an example of a physical property.

What is a physical property?

A physical property can be defined as any feature of a substance that can be really observed and also measured without changing its chemical composition such as for example, the color, density of a metal, boiling point, conductivity, etc.

Therefore, with this data, we can see that physical properties have a significant impact on the performance and use of a given chemical product and they are associated with intrinsic features of the chemical material that forms molecules.

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Related Questions

how many grams of hexane(C6H14) would be need to make 562 of carbon dioxide

Answers

The mass of hexane, C₆H₁₄ that would be needed to produce 562 grams of carbon dioxide, CO2 is 183 g

How do I determine the mass of hexane, C₆H₁₄ needed?

We'll begin by writing the balanced equation for the reaction.

2C₆H₁₄ + 19O₂ → 12CO₂ + 14H₂O

The following are obtained from the equation:Molar mass of C₆H₁₄ = 86 g/molMass of C₆H₁₄ from the balanced equation = 2 × 86 = 172 g Molar mass of CO₂ = 44 g/molMass of CO₂ from the balanced equation = 12 × 44 = 528 g

From the balanced equation above,

528 g CO₂ were produced from 172 g of C₆H₁₄

With the above information, we shall determine the mass of hexane, C₆H₁₄ needed to produce 562 g CO₂. Details below:

From the balanced equation above,

528 g CO₂ were produced from 172 g of C₆H₁₄

Therefore,

562 g of CO₂ will react to produce = (562 × 172) / 528 = 183 g of C₆H₁₄

Thus, the mass of hexane, C₆H₁₄ needed is 183 g

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3. Silances are more reactive than alkanes. Explain.

Answers

The lower bond energy of the silicanes make them more reactive than the alkanes.

What are the silicanes?

We know that the members of group four has the ability to catenate and this is a property that characterizes all the elements that we can find in the group. However the extent to which the members of the group can be able to catenate is what we use to determine the stability of the bonds.

The alkanes are composed of the bonds that exist between carbon and hydrogen and the alkanes can be able to form very long chains and this can be used to explain the fact that you can be able to find the alkanes in various kinds of applications.

However, the bond energy of the silicanes is less than that of the alkanes hence they tend to be more reactive  then the alkanes.

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O
Question 2 of 10
Which of the following values best classifies a bond between 2 atoms as
being covalent?
A. An electronegativity difference of greater than 2.7 between the
atoms
B. An electronegativity difference of greater than 1.7 between the
atoms
C. An electronegativity difference of less than 1.7 between the atoms
D. An electronegativity difference of less than 2.7 between the atoms
← PREVIOUS
SUBMIT

Answers

A bond between 2 atoms as being covalent an electronegativity difference of greater than 1.7 between the atoms.

What is bond?

Bond is a debt instrument, which is issued by governments and corporations. These bonds are used to raise capital for various projects and investments. Bonds are a form of loan and investors are usually paid a fixed interest rate for lending their money. Bonds are typically issued for a fixed period of time, usually for a period of 5-30 years, and have a fixed maturity date. Investors receive interest payments at regular intervals and receive the principal amount of the bond at the end of the period.

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How many moles of gas are present if P=1atm, V=1L, T=1K?
it depends on the chemical's molar mass
O.12
8.314
01

Answers

The number of moles of the ideal gas is 0.12 moles. Option A

What is the number of moles?

In the context of the problem that we have here, we are looking at the ideal  gas equation. When we look at the idea gas equation, we can tell that we would have the pressure of the gas, the volume of the gas as well as the temperature of the gas in view as is the case that we have here.

Thus, the idea that we are asked to pass across in the question is that we should be able to find out the number of moles that we have in the compound that have the variables that have been listed here.

Pressure (P) =  1 atm

Volume (V) = 1 L

Temperature (T) = 1 K

Number of moles (n) = ?

Using;

PV = nRT

n = PV/RT

n = 1 * 1/0.082 * 1

n = 0.12 moles

The moles of the gas is 0.12 moles.

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Why do some elements not take part in chemical bonds?

Answers

Answer:

Because there is some element which is already in an octet state and has no need to achieve it, they have a full electron in their outermost shells such as helium, argon etc.

What is the ratio between the numbers 30 and 90

Answers

the answer is 1:3 ……
30:90
1:3

you can divide it

an oxygen atom, the number of nucleons is 16. What is its atomic mass?​

Answers

Answer:

oxygen-16 is a stable isotope of oxygen, having 8 neutrons and 8 protons in its nucleus. It has a mass of 15. u

CHEMISTRY - DOES ANYONE KNOW HOW TO DO THIS QUESTION???

Answers

Cathode: 2 Ag+ (aq) + 2 e- → 2 Ag (s). Anode: 2 H+ (aq) → H2 (g) + 2 e-.

What is cathode ?

A cathode is an electrode in an electrical circuit from which electrons flow out. It is usually made of metal and is negatively charged. Cathodes are commonly used in electronic devices such as batteries, lamps, and vacuum tubes. In a battery,

the cathode is the terminal which provides a negative charge and is usually connected to the negative terminal of the battery. In a vacuum tube, the cathode is the source of electrons which flow through the tube to the anode, which is the positive terminal.

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Rank the following fibers on the degree to which a dye will bind to the fabric and resist fading.
rank the following fibers on the degree to which a dye will bind

Answers

Answer:

polymer mear least receptive to dye

,

Please help me fill in the blanks

Answers

Sublevels are indicated by letters s, p, d, and f.

How do write Electronic configuration?

Electron configurations have a standard notation that tells you the principle energy levels and sublevels that electrons occupy. here is Sulphur:

The atomic number of Sulphur is 16.

the electronic configuration of Sulphur is 1s2 2s2 2p6 3s2 3p4.

The 4s sublevel has lower energy than the 3d sublevel,

so, it fills next.

Which four different electron configurations are there?

One orbital can house a maximum of two electrons, and there are four different types of orbitals (s, p, d, and f). More electrons can be held in the p, d, and f orbitals since they contain various sublevels. According to its location on the periodic table, each element's electron configuration is distinct.

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What is the molecular weight of (NH4)2SO4

Answers

The molecular weight of [tex](NH_4)_2SO_4[/tex] would be 132 g/mol.

Calculation of molecular weights

The molecular weight, otherwise known as the molar mass of substances is the sum of the molar weights of individual atoms that make up the substance.

[tex](NH_4)_2SO_4[/tex] is made up of 2 atoms of N, 8 atoms of H, 1 atom of S, and 4 atoms of O.

Molar weight of N is 14 g/molMolar weight of H is 1 g/molMolar weight of S is 32 g/molMolar weight of O is 16 g/mol

Thus, the molecular weight of [tex](NH_4)_2SO_4[/tex] = (14x2) + (1x8) + 32 + (16x4)

                                                                     = 132 g/mol

In other words, the molecular weight of [tex](NH_4)_2SO_4[/tex] is 132 g/mol.

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C(s) + O2(g) → CO2(g) ΔHº = -94.6 kJ

H2(g) + \scriptsize \frac{1}{2}O2(g) → H2O(l) ΔHº = -286.0 kJ

2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O (l) ΔHº = -2598.8 kJ

calculate the value of ΔHº for the final reaction:

2C(s) + H2(g) → C2H2(g) ΔHº = kJ

Answers

The value of enthalpy(ΔHº) for the final reaction (2C(s) + H₂(g) → C₂H₂(g) ) is  -1932.8KJ.

Enthalpy change: what is it?

A system's enthalpy is its heat capacity. A reaction's enthalpy change is roughly equivalent to how much energy is lost or gained throughout the reaction. If the enthalpy of the system decreases over the reaction, the reaction is preferred.

C(s) + O₂(g) → CO₂(g) ΔHº = -94.6 kJ --- (1)

H₂(g) + O₂(g) → H₂O(l) ΔHº = -286.0 kJ ---(2)

2C₂H₂(g) + 5O₂(g) → 4CO₂(g) + 2H₂O (l)  ΔHº = -2598.8 kJ ---(3)

The value of ΔHº for the final reaction,

2C(s) + H₂(g) → C₂H₂(g)

ΔH₄° = 2× ΔH₂º +  ΔH₃º - ΔH₁º
ΔH₄° = 2× -286.0 + ( -2598.8) - (- 94.6)

ΔH₄° = 2× -286.0 -2598.8 + 94.6

ΔH₄° = 666 - 2598.8

ΔH₄° = -1932.8KJ.

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8. Jill conducted an experiment to investigate which plant food would make her
plants grow faster. She tried four different plant foods on plants of the same
type and age. Jill concluded that the plant that was fed Brand A grew the
fastest. Jill did not realize that the plant that was fed Brand A also received
more sunlight. (SC.7.N.1.5.3)
What error did Jill make in her experiment?
a) She used the wrong kind of plant.
b) She used too much plant food.
c) She did not control the variables.

Answers

the answer is cccccc
c) She did not control the variables.

In her experiment, Jill did not take into account the fact that the plant that was fed Brand A also received more sunlight. This means that there is another variable, besides the plant food, that could have affected the growth rate of the plant. By not controlling this variable, Jill's conclusion that Brand A was the best plant food may not be accurate. To properly control variables and make a valid conclusion, Jill should have ensured that all plants received the same amount of sunlight, or use other methods to control this variable as well.

What is the name of the charge that orbits the nucleus called?

Answers

Answer:

Electrons

Explanation:

"An electron is a negatively charged particle that orbits the nucleus of an atom."

"Electrons are negatively charged particles arranged in orbits around the nucleus of an atom"

Please help me I really need the help

Answers

Thermal energy is the sum of all the potential and kinetic energy of the atoms within a system that is responsible for its temperature.

How to conclude the Electro negativity?

Friction transforms other forms of energy into thermal energy. Atoms are the building blocks of matter. Atoms are composed of subatomic particles called protons, neutrons, and electrons.Periodic trends are patterns on the periodic table that illustrate elements’ characteristics.Significant trends are atomic radius, metallic reactivity, electronegativity, electron affinity, and ionization energy.

Atomic radius and metallic reactivity trends: They increase when they move down a group and left across a period.Electronegativity, electron affinity, and Ionization energy trends: They increase when they move up a group and right across a period.

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what is van't hoff factor?
state the formulas to calculate " i " during association or dissociation.

tysm! :)​

Answers

The relationship between the calculated concentration of a material and the actual concentration of particles is known as the Van't Hoff factor.

I is the difference between a typical or theoretical colligative quality and an observable one.

What does the connection van t Hoff factor mean?

The van 't Hoff factor is the difference between the concentration of a material determined by its mass and the concentration of particles actually formed when the substance is dissolved. The van 't Hoff factor is virtually 1 for the majority of non-electrolytes dissolved in water.

What does Van t Hoff factor mean in terms of connection and dissociation?

For dissociation, association, and the non-electrolyte solute, the Van't Hoff factor value is more than one, less than one, and equal to one respectively.

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The half-life of Po-218 is three minutes. How much of a 2.0 gram sample remains after 15 minutes? Suppose you wanted to buy some of this isotope, and it required half an hour for it reach you. How much should you order if you need to use 0.10 gram of this material?

Answers

(2)(½^(15/3)) = 0.0625 (5 half-lives) 102.4 grams order

What is the half-life of an isotope?A radionuclide's half-life is the amount of time it takes for half of its radioactive atoms to decay. A good rule of thumb is that you will have less radiation than 1% of the original amount after seven half-lives.Knowing an element's alpha, beta, or gamma decay can help someone properly protect their body from excessive radiation. Within one half-life, the amount of radioactive nuclei present at any particular time will be reduced to half.Each radioisotope has a set half-life that can be anywhere between a few milliseconds (for example, 215At at 0.1 milliseconds) and billions of years (e.g.,238U at 4.468 billion years). Both stable and radioactive isotopes can exist for an element.The period of time needed for something to go from 50% to 50%

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Why don’t different varieties of corn plants grow to the same size under similar growing conditions?

Answers

Because they were planted at different times in different conditions

What is the molecular weight of H2O

Answers

Answer:

18.015

Explanation:

Using the periodic table of the elements to find atomic weights, we find that hydrogen has an atomic weight of 1, and oxygen's is 16. In order to calculate the molecular weight of one water molecule, we add the contributions from each atom; that is, 2(1) + 1(16) = 18 grams/mole.

Which statement is true about the potential energy diagram for an endothermic reaction? (5 points)
The potential energy of the products is equal to the potential energy of the reactants.
It starts at a higher energy value and ends at a lower energy value.
The energy value remains the same throughout the diagram.
Products have more potential energy than reactants.

Answers

In an endothermic reaction,  potential energy of products  is greater than that of the reactants. Reactants in endothermic reaction are absorbing enough heat energy to overcome this barrier potential. Hence, option  d is correct.

What is an endothermic reaction?

An endothermic reaction is the one in which heat energy is absorbed by the reactants from the surroundings. In endothermic reactions, the enthalpy change is positive.

The minimum energy that the reactants have to acquire for effective collision and reaction is called the activation energy. By absorbing heat energy reactants becomes  more energetic and overcome this activation potential.

Therefore, in an endothermic reaction, the activation potential of products will be higher than that of the reactants . Hence, option d is correct.

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EXPLAIN Before medical images are taken, radioisotopes are often injected into a vein in a patient’s arm, or the patient drinks a solution containing the radioisotopes. Why do
you think atoms in the body usually do not emit radiation?

Answers

Answer: adioisotopes, are species of chemical elements that are produced through the natural decay of atoms. Exposure to radiation generally is considered harmful to the human body, but radioisotopes are highly valuable in medicine, particularly in the diagnosis and treatment of disease.

Explanation:

What is the density of a 1209 kg object that is 1.94 m3 in size?

Answers

Answer:

623 kgm^-3

Explanation:

Density = Mass/Volume

Mass = 1209 kg

Volume = 1.94 m^3

Density = 1209 / 1.94 kgm^-3

             = 623.1958763 kgm^-3

             = 623 kgm^-3 (3sf)

how do you test the methods of cleaning an oil spill while not risking the lives of the organisms

Answers

Answer:

Get a controlled environment, such as a pool or even a bowl. Pour some oil in it then you can test your solutions without causing any damage.

Explanation:

What is the hybridization of all the atoms (other than hydrogen) in each of the following species?
Drag the appropriate items to their respective bins.

Answers

The hybridization of C in HCN is sp because, carbon is triple bonded to the nitrogen. Hybridization of N in HCN is also sp. Hybridization of nitrogen in NH₄ is sp³.

What is hybridization?

When tow atoms combines to form a molecules, the energy of individual atomic orbitals redistribute to form  hybrid orbitals of  equivalent energy. The type of hybridization s based on the on the involvement of s, p or d orbitals of the atom.

In HCN, carbon is triple bonded to nitrogen. Here, both s and p orbital contribution is 50%. Hence, both C and N in HCN in sp hybridized.

In NH₄, the nitrogen is sigma bonded to each hydrogen and the hybridization of N is sp³ here since, 3 p orbitals of nitrogen and one s orbital are involved.

In CH₃-,  C is sp² hybridized and in CH₃⁺ , C is sp³ hybridized. The C in C(CH₃)₄ is also sp³ hybridized where carbon involves sigma bonds with the methyl groups.

N in NH₃ is sp³ hybridized. Oxygen in water is sp² hybridized. When water abstracts one more proton forming H₃O⁺ , oxygen forms sp³ hybridized orbitals.

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Are all antigens foreign substances?

Answers

No, not all antigens are foreign substances.

An antigen is any substance that can trigger an immune response, including the production of antibodies. Some antigens are naturally present in the body and are called "self" antigens which are usually not harmful, but in some cases, the immune system can mistakenly recognize them as foreign and attack them which can lead to autoimmune diseases.

Antigens bind together with antibodies and promote the elimination of harmful pathogens present in the body. They alert other parts of the immune system to take over which helps to neutralize the threat from pathogens.

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Use the data in the table below to calculate the heat of vaporization (AHvap) in kJ/mol of pinene.
Vapor Pressure
(torr)
760
515
340
218
135


Temperature
(K)
429
415
401
387
373
kJ/mol
Use the value of AHyap determined in Part 1 to calculate the vapor pressure of pinene (in torr) at room temperature (23°C)
760
torr

Answers

Answer:

41 kJ/mol4 torr

Explanation:

Given pinene has a (temperature, vapor pressure) relation (K, torr) = {(373, 135), (429, 760)}, you want the heat of vaporization in kJ/mol and the vapor pressure at room temperature (23 °C).

Clausius–Clapeyron Equation

The Clausius–Clapeyron equation can be used to find the heat of vaporization:

  [tex]\ln{P}=-\dfrac{\Delta H_{\text{vap}}}{R}\left(\dfrac{1}{T}\right)+C[/tex]

Solving for ∆H, we find ...

  [tex]\Delta H_{\text{vap}}=-\dfrac{R\cdot\ln{\dfrac{P_1}{P_2}}}{\dfrac{1}{T_1}-\dfrac{1}{T_2}}\\\\\\\Delta H_{\text{vap}}=-\dfrac{8.314\cdot\ln{\dfrac{760}{135}}}{\dfrac{1}{429}-\dfrac{1}{373}}\approx 41052.8[/tex]

The heat of vaporization of pinene is about 41 kJ/mol.

Vapor pressure

Rearranging the above equation to give P1, we have ...

  [tex]\ln{\dfrac{P_1}{P_2}}=-\dfrac{\Delta H_\text{vap}}{R}\left(\dfrac{1}{T_1}-\dfrac{1}{T_2}\right) \\\\\\P_1=P_2\cdot e^{-\frac{\Delta H_\text{vap}}{R}\left(T_1^{-1}-T_2^{-1})}[/tex]

Using the same P2 and T2 as above, we find the vapor pressure at room temperature (296.15 K) to be ...

  P1 ≈ 4.349 . . . . . torr

The vapor pressure of pinene at room temperature is about 4 torr.

A student placed four magnets of equal size and mass each the same distance from an electromagnet. She turned the electromagnet on and then quickly turned it off. The diagram below shows how far each magnet traveled toward the electromagnet when the circuit was closed.

four magnets near an electromagnet
What is the order of the magnets by strength from strongest to weakest?

magnet W
magnet X
magnet Y
magnet Z
You have to put them in order

Answers

Four magnets near an electromagnet What is the order of the magnets by strength from strongest to weakest. magnet W,magnet X,electromagnet,magnet Y,magnet Z.

What is electromagnet?

An electromagnet is a type of magnet in which the magnetic field is generated by an electric current. It usually consists of a coil of wire that is wrapped around a core of magnetic material such as iron or steel.

When an electric current passes through the wire, a magnetic field is created around the core, making it a magnet. Electromagnets are used in many different applications, such as motors, generators, and speakers.

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Question (1 point)
Given the model, answer the following questions regarding effusion. The orange spheres have a greater root-mean-square speed than the blue spheres. Assume the balloon has a tiny opening for gas molecules to escape.
1st attempt
Part 1 ( 0.5 point)
See Periodic Table See Hint
Which balloon, A or B, most accurately illustrates the effusion of a gas from the central balloon?
Calculate the relative rate of effusion for the orange to blue spheres. The root-mean-square speed for the orange spheres is 495.0m/s. The root-meah-5quare speed for the blue spheres is 380.0m/ s.

Answers

According to the claim, Balloon A, which has more blue and less orange, exhibits accurate effusion at a relative effusion rate of 1.303. (orange is 1.303 times more effused than blue).Relative rate of effusion for the orange to blue spheres = 1.531.

What is effusion ?

The process of effusion is when a gas escapes from a container through a hole that is significantly smaller in diameter than the molecules' mean free path.

Gas molecules flow through a small opening in one container and into another by effusion. Graham's law allows rates of effusion to be compared at the same temperature. Diffusion is the random molecular motion-based movement of gas molecules through one or more other types of gas.

Rate of effusion of Orange / Rate of effusion of blue

= [Mblue / Morange]^1/2

Vrms = sqrt [(3RT/M)]

Vorange / Vblue = [ Mblue / Morange]^1/2

Rate of effusion of Orange / Rate of effusion of blue

= 565/ 369

= 1.531

Thus,  Balloon A, which has more blue and less orange, exhibits accurate effusion at a relative effusion rate of 1.303.

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No Constant Variable
A 2.00L sample of gas at STP is heated to 500K and compressed to 200 kPa. What is
the new volume of the gas?
I’ll give you all my points

Answers

The new volume of the gas will be 1.85L.

The three gas laws are what?

According to Boyle's Law, as pressure lowers, gas volume grows. According to Charles' Law, when the temperature rises, the volume of the gas also rises. Avogadro's Law also states that as the amount of gas increases, so does the volume of the gas.

Given, initial volume of gas V1 = 2L

initial temp T1 = 273K

initial pressure P1 = 101.3 kPa

final temperature, T2 = 500K

Final pressure, P2 = 200 kPa

let final or new volume be V,

now for a constant moles of gas,

by using ideal gas equation,

P1×V1/T1 = P2×V/T2

101.3×2/273 = 200×V/500

202.6/273 = 2V/5

V = 0.742×5/2

V = 1.85 L

The new volume of the gas will be 1.85L.

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The reaction below shows the combustion of propane (C3H8). Why is the mole ratio (3 moles CO2/1 mol C3H8) used to determine the amount of carbon dioxide (CO2) produced when propane (C3H8) combusts in excess oxygen? (1 point) C3H8 + O2 yields CO2 + H2O + heat Propane has a mass that is 3 times greater than that of CO2, so only 1 mole of C3H8 is needed to produce 3 moles of CO2. When the chemical equation for propane combustion is balanced, 1 mole of C3H8 is needed to produce 3 moles of CO2. During combustion, CO2 is approximately 3 times more reactive than C3H8, so less C3H8 will participate in the reaction. Carbon dioxide has a volume of about one-third that of C3H8, so 3 moles of CO2 are needed to react with each mole of C3H8.

Answers

One mole of the propane produces three moles of the carbon dioxide from mole ratio.

What is the mole ratio?

When we talk about the mole ratio, we mean the ratio of the species that can be found in the reaction. We can be able to get the mole ratio from the balanced reaction equation and we apply it to solve problems from the stoichiometry of the reaction.

Given the fact that we have the reaction as it has been written in the question, it is clear that we would need about one mole of the propane to produce three moles of carbon dioxide.

We can see that there are three atoms of carbon in the propane and the implication of this is that we are going to produce three atoms of carbon dioxide in the product.

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an object of mass m experiences a gravitational acceleration from a planet of mass M. If the objects mass is doiubled what are the twenty adjectives? I need help on this For each of these variables, which of the mean, median, or mode would be the best choice to describe the typical behavior of the variable? Why?Sales prices of housesAge of 1st gradersHeights of women Cecily is a member of an LLC that's selling some property, and Cecily is the listing agent. What must she make sure to do Iris Rosales is an unmarried college student age 21, and is claimed as a dependent on her married parents' tax return. 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Identify the situations shaped by racial ideologies the white house plays host to a magnicificnet tree ever year. in which year did its first official christmas tree In a particular crash test, an automobile of mass 1759 kg collides with a wall and bounces back off the wall. The x components of the initial and final speeds of the automobile are 12 m/s and 2.2 m/s, respectively. If the collision lasts for 0.11 s, find the magnitude of the impulse due to the collision. Answer in units of kg m/s. Calculate the magnitude of the average force exerted on the automobile during the collision. Answer in units of N. To Vaccinate or Not to Vaccinate The debate over whether people should receive vaccinations has been around for a long time. Public resistance to vaccinations has occurred for as long as vaccinations have been available. People who are opposed to vaccines worry that they cause health issues in individuals, especially children. Medical professionals worldwide, however, agree that vaccinations are safe, effective, and necessary. A vaccine is a substance used to create antibodies and boost the immune system against certain diseases. The ingredients in a vaccine may contain a very small piece of a disease-causing germ, or they may contain a form of the germ that is dead or very weak. Because vaccines contain strains of a disease, some people think that they might catch the disease or become ill. However, that is not the case. The germs in vaccines do not pose a risk. The human body reacts to the vaccine by making antibodies. This is helpful because antibodies help fight diseases that are caused by germs. Some people claim that vaccines are not safe because they contain harmful ingredients. People worry that the mercury and aluminum found in some vaccines are linked to life-threatening side effects. However, public health organizations such as the Centers for Disease control (CDC) and the Food and Drug Administration (FDA) stress that the ingredients in vaccines are safe. The amount of chemical additives in a vaccine is very small, and the ingredients are controlled by scientists. Vaccines contain only trace amounts of chemical additives, so they pose little or no risk to the majority of people. In fact, on a daily basis, people are exposed to more bacteria, viruses, and toxins than what is contained in a vaccine. Parents should however be aware of the ingredients in a vaccine just in case their children have had a prior history of allergic reactions. Ultimately, people should take the time to educate themselves about the pros and cons of vaccines. The evidence will show that the risks are minuscule and only pose a risk to a very small portion of the population. Statistics show that most vaccines are more than 90% effective in preventing diseases. Vaccines save millions of children every year from preventable diseases. When most of the population is vaccinated against contagious diseases, the entire community will be more protected. Polio and smallpox are two examples of diseases that have been eliminated through widespread vaccination. However, when people are not vaccinated, they are at risk of catching diseases that others are immune to. These people can also spread contagious diseases and put the entire community at risk.3Select ALL the correct answers.Which two statements best describe the author's point of view? Most young children should be vaccinated against common childhood diseases. More research should be done to develop vaccines without germs to protect children. The choice of whether or not to vaccinate is an individual rather than social concern. It is not necessary for parents to think about the ingredients in vaccinations. Parents should research specific risks related to vaccinating their children. PracticeExample 1Use the graphs to determine the number of solutions the systemhas. Then state whether the system of equations is consistent orinconsistent and if it is independent or dependent.1. y=x-1y = -x + 13. y = x + 42x - 2y = 25. y = 0.5xy=x+27. 2x - 2y = -4-10x - 5y = 152. x-y=-4y=x+44. y=2x-32x - 2y = 26. 4x+6y=122x + 3y = 68. 2x + 3y = 104x + 6y = 12PeriodGO Practice Spiral Review Extra PracticeExamples 2 and 3Graph each system and determine the nu.2x+3y=6y=x+4x-y=-4Ay=x-1y=2x-32x+3y=10y=x+2Date2x-2y=-4.2x-2y=2y=-x+y=0.5x4x+6y=12-10x-5y=15 what is another feature of the night sky? find the value of X.L,MKN You buy clothing at a sale. You buy sneakers at 2 3 of their original price of $60, a sweater at 7 10 of its original price of $35, and a jacket at 5 6 of its original price of $45. Answer each question and show all your work. How much money did you spend A business journal reports that the probability that Internet users in the United States will use a mobile payment app is 0. 60. The journal claims this indicates that out of 5 randomly selected Internet users, 3 will use the mobile payment app. Is this business journal interpreting the probability correctly? A promissory note can best be described as __________., a. an interest-bearing IOU, b. a guarantee of a line of credit, c. a commitment to lend money to someone, d. a government-backed bondThose are your only choices simon Bolivar contributed to the South American revolution by following the philosophycof Jon Locke as an instrument for social and political change Which region has the lowest overall quality of medical services, based on government health care expenditures, thenumber of available hospital beds per 10,000 people and the number of doctors per total population?