Drag each tile to the correct location on the table.

Classify the sentences based on whether they describe a physical change or a chemical change.

Bubbles form when a can of soda is
opened.

Bubbles form when baking soda is
added to vinegar.

The shape of an ice cube kept on a
kitchen counter changes.

The shape and color of a sugar cube
change on burning.

Bubbles are seen in water when it is
heated.

The independent variable, also known as manipulated, is the one that changes and causes an effect on the depenedent variable. The manipulated variable is temperature. Option D.

Independent variables are those modified or changed by the researcher to study how this change affects another variable (the dependent one) and hence the results.

It also receives the name of the manipulated variable because the researcher alters its value or state to analyze its effect. These variables are voluntarily manipulated by the researcher.

In the exposed example,

Goal: To determine the effect of temperature on reaction rates.

Independent (manipulated) variable: Temperature

Dependent variable: time it takes the tablet to dissolve.

Temperature is what affects the time in which the tablet dissolves. The researcher changes temperature levels to analyze how much the time changes.  

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Complete question,

A group of students conducts an experiment to determine the effect of temperature on reaction rates. They perform three separate trials in this experiment.

In the first trial, they drop an antacid tablet into a beaker of water at a temperature of 40 °C and record how long it takes the tablet to completely dissolve.

In the second and third trials, they use the same type and amount of antacid, but they change the temperature of the water to 25 °C for the second trial and 5 °C for the third trial.

The manipulated variable in this experiment is the

A. type of antacid used

B. amount of antacid used

C. time it takes for the reaction to occur

D. temperature at which the reaction occurs

A simple way to calculate the mass of the atom based on Chadwick's discovery is to add the number of neutrons to the number of protons.

Chadwick in 1932 discovered that the atom is also composed of neutral particles found in the nucleus. These neutral particles together with protons account for the mass of the atom. The neutral particles were called neutrons.

The mass of an atom can now be calculated as the sum of the number of neutrons and protons following Chadwick's discovery.

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Answer:

An atom is a chemical substance which exist freely in nature without any reaction .

The measure of the total energy radiated by a star in one second is called luminosity.

Luminosity represents the intrinsic brightness of a star and is a measure of the total power output in terms of energy. It is an important characteristic of a star that indicates its size and temperature.

Luminosity is typically expressed in units of watts or solar luminosities (the luminosity of our Sun). Flux, on the other hand, refers to the amount of energy received per unit area per unit time, and it is influenced by the distance between the star and the observer. Apparent magnitude and absolute magnitude are measures of a star's brightness as observed from Earth and at a standard distance, respectively, and they are related to luminosity but not the direct measure of energy radiated.

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Answer: Metals: Li, Be, Na, Mg, Al, K, Ca, Sc, Ti, V, Mn, Fe, Co, Ni, Cu, Zn

Non-metals: H, He, C, N, O, F, Ne, Si, P, S, Cl, Ar

Metalloid: B

Explanation: The first 30 elements are H, He, Li, Be, B, C, N, O, F, Ne, Na,

Mg, Al, Si, P, S, Cl, Ar, K, Ca, Sc, Ti, V, Mn, Fe, Co, Ni, Cu, Zn

Metallic elements are more electropositive (tending to form ions by donating electrons) with fewer electrons in their outer shell

Non-metallic elements are more electronegative (tending to form ions by accepting electrons) with more electrons in their outer shell

Metalloids are elements somewhere between, but without any specific clear boundary between them and metals/non-metals

group1 and group2 elements, with one or two outer electrons, are all metals: Li, Na, K, Be, Mg, Ca

similarly the transition metals 21-30 are all electropositive and metals.

The noble gases He, Ne, Ar are gases that have completed outer shells and are non-metallic, likewise the halogens F, Cl with 7 outer electrons, and  O and S with 6 are non-metals. N and P (5 outer electrons) are non-metallic as are C and Si (4 outer electrons).

This leaves H, B, Al. H, with its single electron close to the nucleus is a non- metallic gas. Al (3 outer electrons) is metallic, but B, has its 3 electrons close to the nucleus and has the in-between character of a metalloid.

The cathodic protection of Cu(s) can be provided if it is connected galvanically to Zn.

The metal with the more reduction potential will act as the anode and undergo oxidation, while the metal with the more positive standard reduction potential will act as the cathode and undergo reduction.

As Cu has a greater reduction potential than Zn, it has a greater capacity to reduce than that of Zn. So by galvanically connecting to zn, we can say that the cathodic protection of Cu can be obtained.

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Answer:

answer below

Explanation:

The atomic structure primarily affects the chemical, physical, thermal, electrical, magnetic, and optical properties. The properties of a material offer clues as to the structure of the material. The strength of metals suggests that these atoms are held together by strong bonds.

Answer: 28

Explanation:

mechanial energy is the sum of potential and kinetic energy

All of the given ions (acetate, hydroxide, and copper(II)) are present in the complete ionic equation. In the given precipitation reaction, barium hydroxide(aq) and copper (II) acetate(aq) react to form a precipitate of barium acetate(s) and a soluble product, copper (II) hydroxide(aq).

The complete ionic equation for the reaction would show all the aqueous ions dissociated in the solution. However, since barium acetate is insoluble in water, it will not dissociate into its constituent ions. Therefore, the ion that would not be present in the complete ionic equation is the acetate ion. The other ions, including acetate ion, hydroxide ion, and copper (II) ion, will be present in the complete ionic equation.
The precipitation reaction between barium hydroxide (Ba(OH)2) and copper(II) acetate (Cu(C2H3O2)2) can be represented as:

Ba(OH)2(aq) + Cu(C2H3O2)2(aq) → Ba(C2H3O2)2(s) + Cu(OH)2(s)

In the complete ionic equation, only soluble compounds are separated into ions:

Ba²⁺(aq) + 2OH⁻(aq) + Cu²⁺(aq) + 2C2H3O2⁻(aq) → Ba(C2H3O2)2(s) + Cu(OH)2(s)

Since both Ba(C2H3O2)2 and Cu(OH)2 are insoluble, they are not dissociated into ions. Thus, all of the given ions (acetate, hydroxide, and copper(II)) are present in the complete ionic equation.

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The frequency of the yellow light is obtained as 5.2 * 10^ 14 Hz.

When we talk about light, we have to be thinking much about that form of energy that we can be able to perceive by the use of our optical eyes. If I switch on the bulb in a room that is dark, everyone can be able to see the light by the use of the eye. This light that can be seen by the use of eye can also be referred to as visible light.

The yellow light is part of the visible spectrum since we can be able to perceive the yellow light by the use of the two optical eyes that we have.

Given that;

1 nm = 1 * 10^-9 m

580 nm =  580 nm * 1 * 10^-9 m/ 1 nm

= 5.87 * 10^-7 m

We know that;

speed = wavelength * frequency

Frequency = speed/wavelength

frequency = 3 * 10^ 8 m/s/5.87 * 10^-7 m

= 5.2 * 10^ 14 Hz

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When dye changes its solid state to a liquid state is called melting.

What do you understand by melting point?

The melting point is the temperature at which the solid transforms into liquid under atmospheric pressure.

When any solid whether it is a dye or any other chemical substance in a solid state subjected to high heat, the framework of the bonds within the dye becomes weakens and starts breaking down. So, it converted into a less uniform state which is called liquid or solution.

Hence, the whole procedure is called melting

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The energy that an object gains or loses is related by the equation (Q = m•C•T). since a positive value means that heat was added to the system. The heat can be gained or lost without change in temperature.

by the equation (Q = m•C•T)

m=3.50g

C=35

T=+5°c

Q=3.50*35*(+5oC)=612.5.

An object's heat uptake or loss and the resulting temperature variations are related by the description above and the following equation (Q = m•C•T). We now know that heat can occasionally be gained or lost without a corresponding change in temperature. When the substance is changing states, this is what happens.

the amount of heat needed to raise a substance's temperature by one degree Celsius or one kelvin per unit mass.It has the symbol c. joule per kg kelvin is the SI unit. In the SI system, all types of energy are measured in (J/kg K)joules. Because heat is a form of energy, the SI unit for heat is also joules (J), and it is defined as the quantity of energy required to increase the temperature of a given mass by one degree. This is significant because heat is a form of energy.

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Answer:

Most fire extinguishers work by separating the fuel from the oxygen. The oxygen comes from the air. It is the same oxygen we breathe. Since the oxygen has to be in contact with the fuel, if you can coat the fuel with something that keeps the oxygen away, the fire will go out. Some ways of using fire extinguisher are:

Explanation:

I hope it was helpful...

The K s p of Cu(OH)2 = 3.11 * 10^-5

What is K s p value ?

The equilibrium constant for a solid material dissolving in an aqueous solution is the solubility product constant, K s p. It stands for the degree of solute dissolution in solution. A substance's K s p value increases with how soluble it is.

Solubility of A x B y salt

K s p = \(X^x Y^y S^(x+y)\)

Solubility of Ca(OH)2 = 0.0198M

K s p = 1 * 2^2 * ( 0.0198) ^ 1+2 = 3.11 * 10^-5

K s p = 3.11 * 10^-5

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Answer:

The control in this experiment is the temperature of the water.

The independent variable is the amount of sugar that is put in.

The dependant variable in this experiment is when the water freezes.

Explanation:

Name - Function

The brain regulates a variety of bodily processes, such as movement, sensation, thinking, emotion, and behavior.

Activity and Part of the brain it involves are:

a. Testing a hamburger - Sensory cortex in the parietal lobe

b. Artistic ability - Right hemisphere of the cerebrum

c. Kicking a soccer ball - Motor cortex in the frontal lobe

d. Rate of breathing - Medulla oblongata in the brainstem

e. Tying your shoes - Cerebellum

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Answer:

The acid will be neutralized overtime

Explanation:

The presence of the pyrites leads to the leaching of large amounts of sulphuric acid, however the basic carbonates neutralizes the acid according to the reaction equation;

CaCO3 + H2SO4 ---> CaSO4 + CO2 + H2O.

This will prevent all the deleterious consequences associated with the leaching of the acid in the abandoned coal mine.

Answer:B

Explanation: according  to the law of electrostatics it states that  "unlike charge attract each other and like charges repel each other ".

The given equation represents the process of photosynthesis in living plants. This reaction is endothermic, meaning it requires energy input.

The value of ΔH (enthalpy change) for this reaction is positive because the products (glucose and oxygen) have higher energy than the reactants (carbon dioxide and water). Photosynthesis is an endothermic process as it requires energy from an external source, typically sunlight. The equation shows the conversion of carbon dioxide (CO2) and water (H2O) into glucose (C6H12O6) and oxygen (O2). The positive value of ΔH indicates that energy is absorbed during this reaction. In photosynthesis, plants use light energy to drive the synthesis of glucose and oxygen molecules. This energy is stored in the chemical bonds of glucose, making it a high-energy product.

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Answer:

World Cup .

Olympic games.

Answer:

Explanation:

Moles of Pb(NO3)2 =  mass/molecular mass

= 50.0 grams/(207.20*1 + 14.01*2 + 16*6)

= 50.0 grams/331.22

= 0.15 moles

Moles of NaI

= 30/(22.99+126.9)

= 30/149.89

= 0.2 Moles

A. NaI is less 2x Pb(NO3)2 so NaI is the limiting reagent.

B. The ratio is 1 to 2 so there is 0.15 - 0.2/2 = 0.05 mole

or 16.78 grams of Pb(NO3)2 left.

C. As NaI is limiting, only 0.2 Moles of NaNO3 is formed.

Mass =  Moles * Molecular Mass

Molecular Mass of NaNO3 can be calculated as:  

Na - 22.99

N - 14.01

O - 3(16) = 48

23+14+48 = 85gram / mole

Thus, Mass =  0.2*85  = 17 gram of NaNO3

Mass is conserved in a chemical reaction.

Mass of PbI2 can be calculated as:

50+30-16.78-17

= 46.3 gram of PbI2

Mass =  

12.75

Thus, 12.75g of Sodium Nitrate can be formed

Answer:

Explanation:

Pb(NO3)2 (aq) + 2 NaI (aq) --> PbI2 (s) + 2 NaNO3 (aq)

MM for each compound -

Pb(NO3): 207 + 14x2 + 16x3x2 = 331

PI2: 207 + 127x2 = 461

NaI: 23 + 127 = 150

NaNO3: 23 + 14 + 16x3 = 85

Moles of Pb(NO3)2 = 50/331 = 0.15

Moles of NaI = 30/150 = 0.2

Ratio of moles is 1:2

So NaI is limiting

Limited to 0.2/2 = 0.1 mole of Pb(NO3)2

Excess = 0.15 - 0.1 = 0.05 mole

Mass remains = 0.05x331 = 16.55 grams

Moles of NaNO3 formed = Moles of NaI reacted = 0.2

Mass = 0.2x85 = 17 grams

Moles of PbI2 formed = Moles of Pb(NO3)2 reacted = 0.1

Mass = 0.1x461 = 46.1 grams

If 12 grams of NaNO3 actually formed in the reaction,

percent yield = 12/17x100% = 70.6%

Answer:

6

Explanation:

3x2=6

Metallic sodium and chlorine gas are produced by the electrolysis of molten sodium chloride.

A word equation represents a chemical reaction using the names of the substances involved.

a) Word equation:

Sodium chloride + electrolysis →  Sodium hydroxide + Hydrogen gas, Chlorine gas

b) The following reactions take place during the electrolysis of brine solution :

NaCl =\(Na^+ +Cl^-\)

\(H_2O\) =\(H^+ +OH^-\)

Now there are two cations and two anions which get discharged in the following way :

At cathode : \(2H^+ +2e^-\) = \(H_2\)

At anode: \(2Cl^- - 2e-\)=\(Cl_2\)

The remaining ions

\(Na^+ +OH-\) = NaOH

That's why we get \(H_2\), \(Cl_2\) and NaOH.

c) Balance each equation is:

2NaCl (l)  →   2Na(s) + \(Cl_2\)(g)

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Answer:

i think the answer is c because it says that is all they care

Answer:

The concentration of N2(g) in parts per billion (ppb) in a solution can be calculated as follows:

(mass of N2(g) in solution / total mass of solution) * 10^9 ppb

Plugging in the given values, we have:

(1.5 * 10^-6 g / (7.5 g + 1.5 * 10^-6 g)) * 10^9 ppb = (1.5 * 10^-6 g / 7.5 g) * 10^9 ppb = 200 ppb

So, the concentration of N2(g) in the solution is 200 ppb.

Answer:

I do not know

Explanation:

I am vert sorry but I do not know the answer.

Answer:

Just as wavelength and frequency are related to light, they are also related to energy. The shorter the wavelengths and higher the frequency corresponds with greater energy. So the longer the wavelengths and lower the frequency results in lower energy.

Explanation:

Answer:

Seasonal Winds: Blow in opposite direction of normal winds  and cause droughts in winter.

Prevailing Winds: Blow mainly in one direction and move huge air masses.

Mountain Ranges: force coastal air masses to rise, cool, and  form rain clouds.

Explanation:

Hope this helps you, sorry for responding so late... have an amazing night, day, or evening

The term precipitation implies the falling of rain due to condensation of water vapor in the cloud.

The term precipitation implies the falling of rain due to condensation of water vapor in the cloud.  We must note that several factors affect precipitation in a given area.

The following phrases below are matched with how it affects precipitation;

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The percent sugar concentration in orange soda is approximately 13.24%.

The volume of orange soda is given as 355 mL and its density is given as 1.043 g/mL. According to the nutrition label, there are 49 g of sugar in a 355 mL serving of orange soda.Using the density, we can convert the 355 mL volume into grams as follows:Volume = 355 mL; Density = 1.043 g/mL; Mass = ?To convert mL to g we need to multiply the volume with the density. Thus,Mass = Volume x Density= 355 x 1.043= 369.965 gThus, the mass of a 355 mL serving of orange soda is approximately 369.965 g.Next, we can calculate the percentage of sugar in the beverage as follows:Percent sugar concentration = (Mass of sugar / Total mass of beverage) x 100%Percent sugar concentration = (49 g / 369.965 g) x 100%Percent sugar concentration = 0.1324 x 100%Percent sugar concentration = 13.24%Therefore, the percent sugar concentration in orange soda is approximately 13.24%.

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