Rob is conducting an experiment in which he measures a person's body temperature in response to changes in air temperature. What is the independent variable that is manipulated in the experiment?

Answer:

No

Explanation:

Two letters on the top, and two letters on the left. (one letter per square)

Answer:

No, it is not.

Explanation:

To draw a Punnett Square, it can only have 4 letters on 2 sides.

I added an image which is an example.

Answer:

The answer to your question is: Letter D.

Explanation:

To have a balanced reaction, the number of elements in the reactants, must be equal to the number of elements in the products.

So, count the number of elements in each side.

                                                __Al + __O2 → __Al2O3

                      reactants                elements         products

                            1                              Al                      2

                            2                             O2                     3

It's unbalanced

Write a coefficient 4 in Al       4 Al +   3O2 →   2Al2O3

                               3 in O2

                              2 in Al2O3

And count again the number of elements

                        reactants                elements         products

                              4                              Al                      4

                              6                             O2                     6

Now, the reaction is balanced

The balanced equation for the formation of aluminum oxide from aluminum and oxygen is 4Al + 3O2 → 2Al2O3, where the ratio of Al to O2 to Al2O3 is 4:3:2. The correct option that reflects these coefficients is (D).

The coefficients that would balance the chemical equation for the formation of aluminum oxide (Al2O3) from aluminum (Al) and oxygen (O2) are found by ensuring that the number of atoms of each element is the same on both sides of the equation. The balanced chemical equation will have the following form:

4Al + 3O2 → 2Al2O3

To balance the equation, we assign coefficients to make sure that the number of aluminum atoms and oxygen atoms are the same on both sides. After placing the coefficients, we confirm that for aluminum, 4 Al atoms on the reactants side balance with 4 Al atoms as part of the 2 units of Al2O3 on the products side. For oxygen, 3 O2 molecules on the reactants side provide 6 O atoms, which balance with the 6 O atoms in the 2 units of Al2O3 on the products side. Therefore, the correct option is (D).

Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.

Ex: cutting a paper, gaining weight, cutting hair

Physical changes end result handiest in a trade in the shape (i.e., strong, liquid, gasoline) or look of a substance, however no longer the chemical composition of the substance.

The substance will still in the end be the same. as soon as a bodily change occurs, it could be reversed.

Modifications within the length or form depending are examples of bodily trade. Physical changes consist of transitions from one country to another, together with from stable to liquid or liquid to gasoline. cutting, bending, dissolving, freezing, boiling, and melting are some of the tactics that create bodily changes.

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Answer:

30 The atomic number is the number of protons

Explanation:

Answer:

An uncharged  zinc atom have 30 protons.

Explanation:

Each chemical element is characterized by the number of protons in its nucleus, which is called the atomic number Z. But in the nucleus of each element it is also possible to find neutrons, the number of which can vary. The atomic mass (A) is obtained by adding the number of protons and neutrons of a given nucleus.

In this case, an atom of the element zinc has an atomic number of 30 and a mass number of 65. So, you can know that Z=30 and A=65.  Then, the number of protons is 30.  And knowing that the number of protons plus the number of neutrons is 65, it is possible to say that the number of neutrons is 35.

Finally, an uncharged  zinc atom have 30 protons.

Answer:

c) volume

Explanation:

mL is a unit of volume

Answer:

Explanation:

D. 2 Fe's, 3 O's

An atom is the smallest indivisible particle of a substance. Most notations of elements in actual sense depicts the combining atoms.

In Fe₂O₃, the subscript gives the idea of the number of combining atoms and their combining ratios. Here, weh have 2 atoms of Fe and 3 atoms of Oxygen.

Activated carbon filters use chemical means to seperate impurities from air:

Chemical reactions occurs when compounds are formed. Activated carbon filters are made up of activated carbons in which impurities have been removed and the pores of the carbon structure have become widened. This leaves the carbon with much surface area for chemical reaction to occur between impurities and the carbon in form of chemical adsorption. One important thing to note is that, in chemical change, it is difficult to resolve the reactants after the product is formed. In physical change, simple seperation techniques are used to seperate the reactants out.

Answer:

All of the above

Explanation:

A star is a hot, giant, massive body that is located millions of miles away. These stars appears to be shiny because of its high temperature that glows producing light. They are comprised of gases such as hydrogen and helium, and they release a huge amount of energy when two hydrogen atoms undergoes fusion.

They generally look star shaped (circular type) from earth but they are somewhat spherical in shape due to their gravity that forces them to get bulge at its equator during its rotation around its own axis.

They have a core that contains iron in them and they progressively formed after the exhaustion of the hydrogen and helium fuel.

Hence, all the given options are correct.

Answer:

The answer is A, C, E for E2020 users. I just took the unit test review.

Explanation:

Answer:

Carbon dioxide is produced, and as a gas, it was not captured to measure its mass.

Explanation:

Answer:

Carbon dioxide is produced, and as a gas, it was not captured to measure its mass.

Explanation:

Answer:

Explanation:

Given parameters:

Mass of calcium carbonate = 1.73g

Mass of sodium carbonate = 2.34g

Mass of magnesium sulfate = 1.93g

Unknown:

Percentage of calcium carbonate in the mixture

Solution:

The mixture consists of :

   calcium carbonate + sodium carbonate + magnesium sulfate:

To find the percentage of calcium carbonate, we must first find the mass of the mixture by summing the masses of the different compounds that makes up the mixture:

            Mass of the mixture = 1.73 + 2.34 + 1.93 = 6.00g

Therefore,

percentage of calcium carbonate = [tex]\frac{mass of calcium carbonate}{mass of mixture}[/tex] x 100

Percentage of calcium carbonate = [tex]\frac{1.73}{6}[/tex] x 100 = 28.83%

28.83 % of calcium carbonate is present.

Calcium carbonate [tex]\rm (CaCO_{3})[/tex] is the compound found in aragonite and calcite and is the major element of shells and skeletons. It is also used as a dietary supplement.

Given,

The total mass of the mixture will be:

[tex]\begin{aligned}\rm Mass \;of \;mixture} &= \rm \;mass\; of \;CaCO_{3} + \rm \;mass \;of \;NaCO_{3} + \rm \;mass \;of\; MgSO_{4}\\\\&= 1.73 \rm \;g + 2.34 \rm \;g + 1.93 \rm \;g \\\\&= 6.00 \rm \;g \end{aligned}[/tex]

The percentage of a compound or an element in a mixture can be  calculated as:

[tex]\% \text{of substance} = (\dfrac{\text{mass of substance} }{\text{mass of mixture}}) \times 100[/tex]

Now substitute values in the formula:

[tex]\begin{aligned}\% \text{of substance} &= (\dfrac{\text{1.73 g} }{\text{6.00 g}}) \times 100\\\\&= 28.8 \%\end{aligned}[/tex]

Therefore, 28.83 % of calcium carbonate is present.

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Answer:

4 sig figs

Explanation:

There are 4 because they are all # 1 or above.

0 has special rules on whether or not it is significant.

0 being between two other sig figs no matter how far apart makes it a sig fig.

example: 101 is 3 sig figs

0 that is at the end of a non decimal number are not significant.

example: 110 is 2 sig figs

0 that are after a decimal are significant as long as they after another sig fig.

example: 1.000 and .1000 are both 4 sig figs

extra examples:

110.01 is 5 sig figs

110.1 is 4 sig figs

.0001 is 1 sig figs

Answer:

The energy of an electron in many–electron atom is determined by both principal quantum number (n) and azimuthal quantum number (l)

Answer:

Chemicals can affect our lives positively and negatively.

Explanation:

Positively: can help cleaning be easier, can keep bugs from eating plants, etc.

Negative: They can burn you if it is dangerous and your skin is exposed, can be hazardous to your health.

Answer:

Explanation:

Chemicals can affect lives positively and negatively.

Positively: The chemicals are the source of food for building up body and maintaing energy in it.

The chemicals can be in the form of insecticide or pesticide which kill pests, and disease causing insects.

Negatively: The chemicals are in the form of posionous gases like carbon dioxide, sulphur dioxide and others can be responsible for respiratory problems and even death.

Final answer:

A cylinder is a 3-dimensional geometric shape with two parallel circular bases and a curved surface. It has applications across disciplines, including biology and physics, where its volume calculation (V = A*h) is crucial, and its shape influences resistance in electric circuits and the properties of capacitors and sound.

Explanation:

The definition of a cylinder in mathematics refers to a 3-dimensional geometric shape with two parallel circular bases connected by a curved surface. This surface is perpendicular to the bases and extends the same distance from every point on one base to the corresponding point on the other base. Cylinders can be found in various applications, from everyday objects like pipes and cans to biological structures and fluid dynamics.

In biology, cylinders are significant structures for mobility in organisms. For example, stolons in plants and rhizomorphs in fungi have cylindrical shapes that allow them to spread and cover territory effectively. Similarly, in physics, the concept of a cylinder is used to understand resistance in electric circuits and fluid mechanics. The volume of a cylinder is calculated by multiplying its cross-sectional area A by its height (V = A*h), which is a crucial factor in determining its capacity or the amount of substance it can hold.

In addition, when discussing capacitors or sound in physics, a cylindrical shape is a fundamental part of the structure affecting their properties. These examples demonstrate the importance of understanding cylindrical geometry in both theoretical and practical applications.

Answer:

Biotic components, or biotic factors, can be described as any living component that affects another organism or shapes the ecosystem. This includes both animals that consume other organisms within their ecosystem, and the organism that is being consumed

Explanation:

also you spelt it wrong

The  matching of each of the following element symbols to its name, atomic mass, or atomic number can be done as;

Sulfur is a chemical element with the atomic number 16 and the symbol S. Sulfur is a solid at ambient temperature and is categorized as a nonmetal.

Tin is a Group 14 (the carbon family) element with mostly metallic characteristics. Tin has an atomic mass of 118.710 atomic mass units and an atomic number of 50.

Tin is the element listed as Sn in the periodic table. Stanum is the latin name of the metal from which Sn is derived.

Se is a group 6 element and is selenium. It is a member of the same group as tellurium, oxygen, and sulfur. The atomic weight of this material is 78.96 g/mol.

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Answer:

initially it will form precipitate and with excess of ammonia it will form soluble product.

Explanation:

The reaction of nickel with ammonia is:

With aqueous ammonia nickel precipitate out as green gelatinous Ni(OH)₂:

[light green][tex]Ni^{+2}(aq) + 2 OH^{-}(aq)--->2 Ni(OH)_{2}(s)[/tex] (green colored).

If we add further more of ammonia, it will dissolve to form blue solution as:

[tex]Ni(OH)_{2}(s) + 6NH_{3}(aq) <==> [Ni(NH_{3})_{6}]^{+2}(aq) + 2OH^{-}(aq)[/tex]

So initially it will form precipitate and with excess of ammonia it will form soluble product.

Answer:

26,167.47m

Explanation:

Problem:

We are to solve this problem using dimensional analysis:

  from the given conversion factors-

      0.621mi = 1.00km

       1km = 1000m

From the problem, we are groing from miles to metres:

      16.25mi x [tex]\frac{1km}{0.621mi}[/tex] x [tex]\frac{1000m}{1km}[/tex]

The mi will cancel out and also the km. This leaves us with the desired unit we want which is meters, m.

       =  26,167.47m

Answer:

The number of grams of CO that can react with 0.400 kg of [tex]Fe_2 O_3[/tex] is 210 g.

Explanation:

The balanced chemical equation is

[tex]$F e_{2} \boldsymbol{O}_{3}(s)+3 \boldsymbol{C} \boldsymbol{O}(\boldsymbol{g})>2 \boldsymbol{F e}(\boldsymbol{s})+3 \boldsymbol{C} \boldsymbol{O}_{2}(\boldsymbol{g})$[/tex]

[tex]$0.400 \mathrm{kg} \mathrm{Fe}_{2} \mathrm{O}_{3} \times \frac{1000 \mathrm{g} \mathrm{Fe}_{2} \mathrm{O}_{3}}{1 \mathrm{Kg} \mathrm{Fe}_{2} \mathrm{O}_{3}} \times \frac{1 \mathrm{mol} \mathrm{Fe}_{2} \mathrm{O}_{3}}{159.7 \mathrm{gFe}_{2} \mathrm{o}_{3}} \times \frac{3 \mathrm{molCO}}{1 \mathrm{molFe}_{2} \mathrm{o}_{3}} \times \frac{28 \mathrm{g} \mathrm{CO}}{1 \mathrm{mol} \mathrm{CO}}$[/tex]

=210g CO is the Answer

The number of grams of CO that can react with 0.400 kg of [tex]Fe_2 O_3[/tex] is 210 g.

Answer:

They are physical changes.

Explanation:

This is because there in no chemical reaction taking place, just a physical change.

A physical change in a change in which the chemical structure of the substance does not change. Ice, water and steam are all the same on a molecular level, thus changing from ice to water or from water to steam are physical changes.

A chemical change is a change in which the chemical structure of the substance undergoes a change, since this does not happen going for A to B or B to C they are not chemical changes.

Answer:

The symbols on the right of the arrow in a chemical reaction is called the "products". The symbols to the left of the arrow is called the "reactants".

Final answer:

In a chemical reaction, the substances to the right of the arrow are known as the 'products.' They are the new compounds formed as a result of the reactants undergoing the chemical reaction.

Explanation:

In a chemical reaction, the substances that appear to the right of the arrow are called the products. These substances are the result of the reactants undergoing a chemical change during the reaction. For example, in the chemical equation:

Zn + S =ZnS

Zinc (Zn) and sulfur (S) are the reactants found on the left side of the arrow, and zinc sulfide (ZnS) is the product found on the right side. During the reaction, zinc and sulfur combine to form zinc sulfide. It is important to note that in reversible reactions, indicated by a double arrow, the terms 'reactant' and 'product' can change based on the direction of the reaction. Overall, the standard convention for writing chemical equations involves reactants on the left, an arrow indicating the direction, and products on the right.

Characteristics of a solid is that they have a "definite mass, volume and shape." Also who's molecules are closely packed together barely moving. Any object could be a example of a solid as long as it has mass, volume, and shape.

Hope this helps.

Answer:

silver

Explanation:

Silver is a metal at room temperature.

The physical state of matter can help us know which of these substances will be the most dense. Density deals the amount of substances per unit volume.

Solids are packed closely and have a definite and ordered arrangement of their atoms. From the list above only Silver is a solid at room temperature.

Bromine is a liquid at room temperature while chlorine and oxygen are gases at room temperature. Liquids and gases do not have more substances per unit volume compared to solids. Therefore, silver should be the most dense.

Answer:

The answer is silver. Silver is the most dense, it's a solid so it is more compact and is obviously the most likely to have more mass to it. option D

Explanation:

Answer:

Approximately 5.00 × 10⁸ tons per day. (Rounding error: less than 1.1%.)

Explanation:

How many cubic feet of water flows over this waterfall each day?

The question gives only the number of cubic feet of water that flows over each second. To find the volume for each day, start by finding the number of seconds in a day.

There are 60 seconds in a minute and 60 minutes in an hour. That translates to [tex]60 \times 60[/tex] seconds in an hour.

There are 24 hours in a day. Each hour contains [tex]60 \times 60[/tex] seconds. That means that there are [tex]24 \times 60 \times 60[/tex] seconds in a day.

[tex]2.02 \times 10^{5}[/tex] cubic feet of water flows over this waterfall every second. Therefore, [tex]24 \times 60 \times 60\times 2.02 \times 10^{5}[/tex] cubic feet of water flows over this waterfall every day.

The weight of one cubic foot of water is [tex]62.4[/tex] pounds. The weight of [tex]24 \times 60 \times 60\times 2.02 \times 10^{5}[/tex] of cubic feet of water will be [tex]24 \times 60 \times 60\times 2.02 \times 10^{5}\times 62.4[/tex] pounds.

It takes 2,200 pounds to make a ton.   [tex]24 \times 60 \times 60\times 2.02 \times 10^{5}\times 62.4[/tex] will translate to [tex]\displaystyle \frac{1}{2200}\times 24 \times 60 \times 60\times 2.02 \times 10^{5}\times 62.4[/tex] tons.

To calculate the rounding error, evaluate

[tex]\displaystyle \frac{\text{Rounded Value} - \text{Actual Value}}{\text{Actual Value}}\times 100\%[/tex] and drop the negative sign if there is one. Rounding the final result to [tex]5.00\times 10^{5}[/tex] gives a rounding error of approximately [tex]1.0\%[/tex].

Water flowing over a particular waterfall at a rate of 2.02 x 10⁵ ft³/s is equivalent to 4.95 × 10⁸ ton/day.

First, we will convert 2.02 x 10⁵ ft³/s to ton/s using the following conversion factors:

[tex]\frac{2.02 \times 10^{5} ft^{3} }{s} \times \frac{62.4lb}{1ft^{3} } \times \frac{1ton}{2200lb} = 5.73 \times 10^{3} ton/s[/tex]

Then, we will convert  5.73 × 10³ ton/s to ton/day using the following conversion factors:

[tex]\frac{ 5.73 \times 10^{3} ton}{s} \times \frac{3600s}{1h} \times \frac{24h}{1day} = 4.95 \times 10^{8} ton/day[/tex]

Water flowing over a particular waterfall at a rate of 2.02 x 10⁵ ft³/s is equivalent to 4.95 × 10⁸ ton/day.

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Answer:

Infrared radiation

Explanation:

The elecromagnetic spectrum is a group of waves that results from electromagnetic vibrations.

In the spectrum, the frequency of the waves increases as their wavelengths decreases. The spectrum is shown below:

Radio waves  Microwaves Infrared Visible light  Ultraviolet Xrays

Answer:

agree

Explanation:

Answer:

Mass states that mass is neither created nor destroyed in a chemical reaction or a physical transformation

Explanation:

Answer:

mass of CO2 = 88 g

Explanation:

It is stated in question that 18.7 g of oxygen remained unreacted which means that carbon is limiting reactant. Thus the amount of carbon dioxide produced depend upon the amount of carbon.

Given data:

mass of carbon = 24 g

total mass of oxygen 82.7 g

mass of unreacted oxygen = 18.7 g

mass of carbon dioxide = ?

Solution:

First of we will calculate the moles of carbon.

number of moles of carbon = mass of carbon / atomic weight

number of moles of carbon = 24 g/ 12 g/mol = 2 mol

Chemical equation:

C + O2 → CO2

now we compare the number of moles of carbon and carbon dioxide,

  C   :  CO2

  1    :    1

 2    :    2

Now we will calculate the mass of carbon dioxide from moles.

number of moles of CO2 = mass of CO2 / molar mass of CO2

2 mol × 44 g/mol = mass

mass of CO2 = 88 g

Answer:

Explanation:

The density of pure lead is 10.49g/cm³

Given parameters:

Volume of water displaced by the crown = 238.1ml

Mass of crown = 2.50kg

Solution

We would simply find the density of the discovered crown and compare with that of the standardized density of lead.

Density is an intensive property of matter and it is the same for any form of matter. It is amount of substance per unit volume:

               Density = [tex]\frac{mass}{volume}[/tex]

We need to convert the given parameters to standard unit,

                                 1ml = 1cm³

         Therefore, the volume of water displaced is 238.1cm³

Also,

                       1kg  = 1000g

                       2.5kg = 2500g

    mass of the crown is 2500g

Density = [tex]\frac{2500}{238.1}[/tex] = 10.49g/cm³

The crown is made of silver because the density matches with that of pure silver.

Answer:

19. g/mL

Explanation:

77.0-50.0=27 mL

d=521g over 27mL or d=521g/27mL

=19.2962963 g/mL

turns into 19. g/mL

hoped this helped! (and that its right-_-)

Answer: A. a battery is an example of a voltaic cell

Choice A is the correct option in this question.

Explanation:

When the Silver Nitrate and copper are put in a container then redox reactions takes place which is the reason behind production of charge in a voltaic cell.

In case of battery also the same reaction takes place but it in a greater magnitude Hence a battery can be said to be a combination of several voltaic cells or we can also say that a battery is a bigger voltaic cell that produces current in a much larger magnitude than a simple cell.

Answer:

a battery

Explanation:

Plato