A family is driving to a nearby city. If they traveled 224.4 miles for 3.3 hours how fast were they traveling?

Answer:

Use friction

Explanation:

Friction is the force that stops something in motion. It also heats up something, creating a gravitational heat! A match striked against the lighter will create a flame, because of friction :)

Answer:

Location x is experiencing daytime because it is facing directly to the sun.

Explanation:

From a background understanding of the solar system, the side of the planet facing the sun will be experiencing daytime while the other side of the planet will be experiencing either partial or total darkness depending on the location.

From the diagram given above, we can see clearly that location x is facing the sun and as such, light rays from the sun lightens the location. When this happens, location x will be experiencing daytime.

In conclusion, location x is experiencing daytime because it is facing directly to the sun.

Answer:

The correct answer on edge for 2021 is C. None.

Explanation:

We know this is correct because the solution is heterogenous after it has been stirred: the substance is not soluble in water.

The solution is heterogeneous after it has been stirred. The cornstarch is not soluble in water. Therefore, option C is correct.

Any mixture of one or more solutes that have been dissolved in a solvent is referred to as a solution. To create a homogenous mixture, a solute must dissolve in a solvent. To create a homogenous mixture, a solute must dissolve in a solvent.

Whereas homogenous mixtures seem consistent throughout, heterogeneous mixtures have clearly discernible components. A solution, which can be a solid, liquid, or gas, is the most typical kind of homogenous mixture.

No matter how you sample a homogenous solution, it often has the same characteristics. Sources of water, saline solution, certain metals, and bitumen are homogenous mixes. Examples of heterogeneous combinations are chicken noodle soup, sand, and oil, and water.

Thus, option C is correct.

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Answer:

b.location in the sky (If the question is saying:The H-R diagram is useful in

studying all of these about a star except for)

Explanation:

The theoretical HR diagram plots the temperature of the star vs their luminosity (brightness) and the observational HR diagram plots color of the stars vs the absolute magnitude. Depending on mass, stars will also go through specific evolutionary stages that can be seen through the location of the star on the HR diagram. However, the HR diagram will not have data on the location of the star in the sky.

Answer:

red

Explanation:

red shows if solution is acidic

Answer:

so mucjsuat least amount of soduim is will be 25percent

Answer:

1375 J/kg.°C

Explanation:

From the question First question,

Q = cm(Δt)................... Equation 1

Where Q = Heat released, c = specific heat capacity of the unknown metal, m = mass of the unknown metal, Δt = Change in temperature.

make c the subject of the equation

c = Q/mΔt.................. Equation 2

Given: Q = -5500 J (Since heat is released, Q is negative), m = 200 g = 0.2 kg, Δt = 10-30 = -20°C

Substitite these values into equation 2

c = -5500/[0.2×(-20)]

c = -5500/-4

c = 1375 J/kg.°C

The statement which best defines the theoretical yield of a reaction is the maximum amount of product that can be obtained.

Yield of any chemical reaction gives idea about the amount of product that will be produced by the chemical reaction between reactants.

Theoretical yield gives idea about the how much maximum yield of any product will be produced in the given chemical reaction by using the stoichiometry of the reaction.

Hence theoretical yield is the maximum amount of product that can be obtained.

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Answer:

B. Ionic Compound

Explanation:

An ionic compound is that compound which contains a positively charged ion called CATION and a negatively charged ion called ANION. The cation loses or transfers electrons to the anion, hence, making the former (cation) positive and the latter (anion) negative.

A polyatomic ion is an ion that contains more than one type of atom e.g OH-, NO3²-, CO3²- etc. A polyatomic ion usually has an overall charge formed from the charges of the individual atoms that makes it up. For example, in OH-, the overall charge is -1.

Since a polyatomic ion can have an overall positive or negative charge, it must enter a reaction with another ion that complements it i.e. a negative polyatomic ion will react with a positive ion to neutralize its charge. Hence, this forms an IONIC COMPOUND. This is why most compounds with polyatomic ions are IONIC COMPOUNDS.

For example, CaCO3 is an ionic compound formed when Ca²+ (cation) reacts with the polyatomic anion: CO3²-

Answer:

the acid used to neutralize the base in oder to form a salt and water

Answer:

FOr question 5, the answer is 80 gramas.

Explanation: According to the graph, when the salt is being dissolved in 100 ml of water at 90 degrees 40 grams had been dissolved. If you double the amount of water, the amount of solubility will also increase.

(Will come back later for edits)

According to the graph, when the salt is being dissolved in 100 ml of water at 90 degrees 40 grams had been dissolved. If you double the amount of water, the amount of solubility will also increase.

The graph shows the solubility curve of an unknown salt. The four points on the diagram represent four solutions of the unknown salt.The ratio of a constituent's abundance to the total volume of a mixture is called concentration. Mass concentration, molar concentration, number concentration, and volume concentration are four different categories of mathematical description.

Salt in freshwater is less than that in salt water, and the concentration of salt in the Dead Sea is greater than the concentration of salt in the oceans. The Dead Sea has a salinity of 33.7 percent, and the second-saltiest lake in the world is the Dead Sea.

Therefore, According to the graph, when the salt is being dissolved in 100 ml of water at 90 degrees 40 grams had been dissolved. If you double the amount of water, the amount of solubility will also increase.

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Answer:

p wave

Explanation:

The P wave is designated the primary preliminary wave because it is the first to arrive at a seismic station after an earthquake. It travels at a speed usually less than 6 kilometers per second in the Earth's crust and jumps to 13 kilometers per second through the core.

Answer:

400ml

Explanation:

To raise the temperature of 250.0 g of mercury by 52°C with a specific heat capacity of 4.18 J/ g°C the heat required is 5.434×10¹ kJ.

For a substance, it's specific heat capacity is the amount of energy required to raise the temperature of unit mass of that substance by 1°C.

If, specific heat capacity (c) = 4.18 J/ g°C

Mass of the substance (m) = 250.0 g

Change in temperature (ΔT) = 52°C

Energy (Q) = ?

Then mathematically the relation could be represented as

  c = [tex]\frac{Q}{ \ m \ (\Delta\ T )}[/tex]

Therefore,  [tex]Q = m\times c \times (\Delta\ T)[/tex]

                   [tex]Q = 250 \times 4.18 \times 52[/tex]

                   [tex]Q = 54,340 J\\Q = 5.434 \times 10^1 kJ[/tex]  

So, to raise the temperature of 250.0 g of mercury by 52°C with a specific heat capacity of 4.18 J/ g°C the heat required is  5.434×10¹ kJ.

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We convert the masses of our reactants to moles and use the stoichiometric coefficients to determine which one of our reactants will be limiting.

Dividing the mass of each reactant by its molar mass:

(10 g C2H6)(30.069 g/mol) = 0.3326 mol C2H6

(10 g O2)(31.999 g/mol) = 0.3125 mol O2.

Every 2 moles of C2H6 react with 7 moles of O2. So the number of moles of O2 needed to react completely with 0.3326 mol C2H6 would be (0.3326)(7/2) = 1.164 mol O2. That is far more than the number of moles of O2 that we are given: 0.3125 moles. Thus, O2 is our limiting reactant.

Since O2 is the limiting reactant, its quantity will determine how much of each product is formed. We are asked to find the number of grams (the mass) of H2O produced. The molar ratio between H2O and O2 per the balanced equation is 6:7. That is, for every 6 moles of H2O that is produced, 7 moles of O2 is used up (intuitively, then, the number of moles of H2O produced should be less than the number of moles of O2 consumed).

So, the number of moles of H2O produced would be (0.3125 mol O2)(6 mol H2O/7 mol O2) = 0.2679 mol H2O. We multiply by the molar mass of H2O to convert moles to mass: (0.2679 mol H2O)(18.0153 g/mol) = 4.826 g H2O.

Given 10 grams of C2H6 and 10 grams of O2, 4.826 g of H2O are produced.

Answer:

B. A method of obtaining an emission spectrum from a sample

Explanation:

Flame test is a method of obtaining an emission spectrum from a sample.

Emission spectrum is defined as a spectrum of a chemical compound or substance composed of frequencies of electromagnetic radiation. Radiations which are emitted while electron make transition from higher to lower energy level.

Energy of photon is equal to the difference between the two energy states . There are many possible electronic transitions in an atom and every transition has a specific wavelength.Flame test is characteristic for each element as that of an emission spectrum.

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Answer:

a) pH = 13.447

b) pH = 13.176

Explanation:

Ba (OH)₂ is a strong base and ionizes completely in solution to give barium amend hydroxide ions.

The equation of the dissociation of Ba(OH)₂ is given below:

Ba(OH)₂ ----> Ba2+ + 2OH-

1 mole of Ba(OH)₂ produces 2 Moles of OH- ions

a) Before the addition of HCl, i.e.,when 0.00 mL of HCl has been added;

Concentration of hydroxide ions, [OH-] = 0.140 x 2 = 0.a) [OH-] = 0.100 x 2 = 0.280

pOH = -log [OH-]

pOH = -log (0.280)

pOH = 0.553

pH = 14 - 0.553= 13.447

b) pH when 15.0 mL HCl has been added

Moles Ba(OH)₂ = concentration × volume

Volume of Ba(OH)₂ = 82.0 mL = 0.082 L, concentration = 0.140 M

moles of Ba(OH)₂ = 0.082 x 0.140 = 0.01148 moles

moles OH- produced by 0.01148 moles of Ba(OH)₂ = 2 x 0.01148= 0.02296

moles HCl = 0.0150 L x 0.560 = 0.0084

moles of H+ produced by 0.0084 HCl = 0.0084

0.0084 H+ willnreact with 0.0084 moles of OH-

moles OH- left after the reaction = 0.02296 - 0.0084 = 0.01456 moles

total volume of new solution = (82 +15) mL = 97 mL => 0.097 L

Concentration of OH- ions = moles / volume

[OH-] = 0.01456 / 0.097 = 0.1501

pOH = -log [OH-]

pOH = -log (0.150)

pOH = 0.824

pH = 14 - 0.824

pH = 13.176

Explanation:

PH=14-POH

=14-2.6

=11.4

Answer:

Initial temperature, T1 = 15°C

Explanation:

Given the following data;

Initial volume, V1 = 250 mL to Liters = 250/1000 = 0.25 L

Final temperature, T2 = 30°C

Final volume, V2 = 0.5 L

To find the initial temperature T1, we would use Charles' law.

Charles states that when the pressure of an ideal gas is kept constant, the volume of the gas is directly proportional to the absolute temperature of the gas.

Mathematically, Charles is given by;

[tex] \frac {V}{T} = K[/tex]

[tex] \frac{V1}{T1} = \frac{V2}{T2}[/tex]

Making T1 the subject of formula, we have;

[tex] T_{1}= \frac{V_{1}}{V_{2}} * T_{2}[/tex]

Substituting into the formula, we have;

[tex] T_{1}= \frac{0.25}{0.5} * 30[/tex]

[tex] T_{1}= 0.5 * 30 [/tex]

Initial temperature, T1 = 15°C

1. Accept and celebrate differences. One of the biggest challenges we experience in relationships is that we are all different. We can perceive the world in many ways. Certainly astumbling block that we come across when we try to build relationships is a desire or an expectation that people will think like we do and, in this way, it is so much easier to create a rapport. We feel more comfortable when we feel that people “get” us and can see our point of view. Life, however, would be very dull if we were all the same and, while we may find it initially easier, the novelty of sameness soon would wear off. So accepting and celebrating that we are all different is a great starting point.

2. Listen effectively. Listening is a crucial skill in boosting another person’s self-esteem, the silent form of flattery that makes people feel supported and valued. Listening and understanding what others communicate to us is the most important part of successful interaction and vice versa.

Active or reflective listening is the single most useful and important listening skill. In active listening, we also are genuinely interested in understanding what the other person is thinking, feeling, wanting, or what the message means, and we are active in checking out our understanding before we respond with our own new message. We restate or paraphrase our understanding of their message and reflect it back to the sender for verification. This verification or feedback process is what distinguishes active listening and makes it effective.

3. Give people your time. Giving time to people is also a huge gift. In a world where time is of the essence and we are trying to fit in more than one lifetime, we don’t always have the time to give to our loved ones, friends, and work colleagues. Technology has somewhat eroded our ability to build real rapport and we attempt to multi-task by texting and talking at the same time.

Being present in the time you give to people is also important, so that, when you are with someone, you are truly with someone and not dwelling in the past or worrying about the future. The connection we make with other people is the verytouchstone of our existence, and devoting time, energy, and effort to developing and building relationships is one of the most valuable life skills.

Answer:

Conduction

Explanation:

Conduction can be regarded as transfer of thermal energy which exist

between two or more objects that are in contact with each other. From the question, the spoon touches the hot liquid and heat is transferred to the spoon through conduction

Answer:

Like signs.

Explanation:

When two charges are like signs, a repelling force will occur.

Answer:

Explanation:

a is a physical change you could put the peices back together

b is a chemical change because you cant unburn wood  

c is a chemical change because you cant unbake it

d is a physicl change you could te your time and unmix it

Answer:

Blank 1: 1

Blank 2: 2

Blank 3: 1

Blank 4: 1

Explanation:

Assuming this is to balance the equation, write out the amount of each element you have on the reactants side and on the products side

Reactants                                                   Products

Ca 1                                                             Ca 1

C 2                                                              C 2

H 2                                                              H 4

O 1                                                               O 2

Comparing the two, we can see that hydrogen and oxygen have different amounts between reactants and products. Therefore, we need to multiply by some number to get the two equal. If we multiply the reactants by 2 we will get the correct amount in the products. So we put a 2 in front of the H₂O to signify this.

The balanced chemical reaction is

CaC₂ + 2 H₂O --> C₂H₂ + Ca(OH)₂

Answer:

In order to increase the temperature of 1 g of aluminium by 1∘C , you need to provide it with 0.90 J of heat

Explanation:

Answer:

For (a): The substances are known as acids and bases.

For (b): The color of the litmus for pH = 10 will be blue.

For (c): The color of the litmus for pure water will be purple.  

Explanation:

pH determines the acidity or basicity of a solution. There are three types of solution classified based on the pH:

Litmus paper is used as an indicator to know the type of solution. There are 2 types of litmus paper:

(a):

An acid is defined as the chemical species that produces hydrogen ions in the solution while a base is defined as the chemical species that produces hydroxide ions in the solution.

(b):

Given pH value = 10

The solution is basic in nature, thus the color of litmus will be blue.

(c):

Pure water is neutral in nature and has a pH of 7.

Thus, the solution of litmus would be purple.

Answer:

There are 5 steps/rules of the ideal gases based on kinetic theory.

Explanation:

1. Particles in a gas are constant moving in random motion.

2. combined volume of the particles is negligible.

3. particles exert no forces on one another

4. any collisions between the particles are completely elastic

5. the average kinetic energy of particles is proportional to temperature in kelvins.

(I had help explaining steps from Sal Khan. I hope this helps! Have a great day!)

Answer:

amylase

Explanation: