Which problem can NOT be answered by experiment?

A) Do ultraviolet rays cause skin cancer

B) Does a certain drug kill the AIDS virus

C) Which wavelength of light has the most energy

D) Did continental drift cause the extinction or the megalodon?

Answer:

This is an oxidation-reduction (redox) reaction

Explanation:

P4

O2

Names: Dioxygen source: wikidata, accessed: 2019-09-07, Oxygen source: ICSC, accessed: 2019-09-04source: wikidata, accessed: 2019-09-07, Oxygen (liquefied) source: ICSC, accessed: 2019-09-04

Appearance: Odourless compressed gas source: ICSC, accessed: 2019-09-04; Liquefied gas. colourless-to-blue extremely cold liquid source: ICSC, accessed: 2019-09-04

Products:

P2O3

Names: Phosphorus trioxide source: wikipedia, accessed: 2019-09-27, Phosphorus(III) oxide source: wikipedia, accessed: 2019-09-27, Phosphorus sesquioxide source: wikipedia, accessed: 2019-09-27

Appearance: Colourless monoclinic crystals or liquid source: wikipedia, accessed: 2019-09-27

Answer:

Answer below:)

Explanation:

5.37 * 10^19 atoms of Iron (mol/6.022 *10^23)= 8.92 *10^-5

Answer:

Physical change

Explanation:

Dissolution of salt in water is a typical example of physical change and not a chemical change.

In a chemical change new products are formed which are different from the reactants.

In a physical change, the state of matter changes from one form to another.

Dissolving epsom salts in water and observing the crystals that are left behind after the water evaporates is not a chemical change.

CHEMICAL CHANGE:

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Answer:

that's ur answer cumulus clouds I hope it helps

Answer:

corona is increasing

.......

Explanation:

.....

The temperature : 154.73 K

Given

mass = m = 5 g of Cl2

P = 900 mmHg = 1,18421 atm

V = 0.75 L

Required

Temperature

Solution

mol Cl2 = mass : MW = 5 : 71 = 0.07

Ideal gas law : PV = nRT

P = pressure, atm  

V = volume, liter  

n = number of moles  

R = gas constant = 0.082 L.atm / mol K  

T = temperature, Kelvin  

T = PV/nR

Input the value :

T = 1.18421 x 0.75 / 0.07 x 0.082

T = 154.73 K

Answer:

Molarity = 0.002 M

Explanation:

Given data:

Mass of calcium chloride = 0.321 g

Volume of water = 1.45 L

Molarity of solution = ?

Solution:

Molarity = number of moles / volume in litter.

We will calculate the number of moles of calcium chloride first.

Number of moles = mass/molar mass

Number of moles = 0.321 g/ 110.98 g/mol

Number of moles = 0.003 mol

Molarity:

Molarity = 0.003 mol / 1.45 L

Molarity = 0.002 M

Answer:

fluorine

Explanation:

hope it helps

The toy is being squished

Answer and Explanation:

I think it's balanced only if they are using the same force. If they are balanced then it stays in place but if they are not it moves in the direction that has the most force...

Answer: the amount of energy needed to move an electron from one zone to another is a fixed, finite amount. At the lowest energy level, the one closest to the atomic center, there is a single 1s orbital that can hold 2 electrons

Explanation:

Answer:

exosphere thermosphere mesosphere stratosphere troposphere

Answer: 29.16%

Explanation:

The total of 2 percentages need to equal 100% so we subtract the percent they gave us from 100.

Answer:

Our sun is an averaged size star compare to other stars.. And the Iron are the heaviest element they can form.

Answer:

Our sun is an averaged size star compare to other stars.. And the Iron are the heaviest element they can form.

Answer )In hot water, the food coloring diffuses (spreads out) through the water quickly. In cold water, the food coloring diffuses (spreads out) through the water slowly. The hot water causes the food coloring to diffuse faster. At higher temperatures, particles move faster.

i hope it is helpful

The atoms and molecules are matter. Therefore, option A and B are correct.

Matter is defined as anything that occupies space and has mass—in other words, the "stuff" of the universe. All matter is composed of substances known as elements, which have distinct chemical and physical properties and cannot be broken down into other substances via ordinary chemical reactions.

Matter is defined as anything that occupies space and has mass. Water and air are examples of matter, whereas feelings and sound are not.

Physical and chemical properties can be used to classify matter. Matter is defined as something that occupies space and has mass. Solid, liquid, and gaseous are the three states of matter. The conversion of a material from one state of matter to another without changing its chemical composition is referred to as a physical transition.

Thus, option A and B are correct.

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Answer:

C.

Explanation:

The question is incomplete, the complete question is;

Ideally speaking, bonds tend to form between two particles such that they are separated by a distance where _______ net force is exerted on them, and their overall energy is _________.

A.zero, maximized

B. a negative, minimized

C. a positive, minimized

D. a positive, maximized

E. zero, minimized

F. a negative, maximized

Answer:

E. zero, minimized

Explanation:

Chemical bonding occurs when there is a dynamic equilibrium between the attractive and repulsive forces. This means  that the magnitudes of the attractive and repulsive forces are equal and the net force is zero.

Also, at the point where bonding occurs, the energy of the system is minimum. The point on the potential energy curve that represents the bonding energy is the lowest point on the curve.

Ideally speaking, bonds tend to form between two particles such that they

are separated by a distance where zero net force is exerted on them, and

their overall energy is minimized.

For chemical bonding to occur there must be dynamic equilibrium. This is

formed from  magnitude of the attractive and repulsive forces being equal

which translates to the net force being zero.

The overall energy at the exact point of bonding is at the minimum which is

to allow easy transfer or sharing of electrons in the formation of a compound.

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Answer:

The answer is B

Explanation:

Protons and electrons have to be equal numbers for it to be neutral

Answer:b

Explanation:

Answer:

True

Explanation:

Units obtained by combining SI units are called derived units.

Fundamental units are base units and these units are:

Derived units are a combination of one or more fundamental units.

For example:

 Speed  = [tex]\frac{distance}{time }[/tex]  

   The unit of speed is m/s and this obtained from length and time

Explanation:

boiling of water  - Physical changes

curdling of milk   - Chemical changes  

photosynthesis   - Chemical changes

melting of wax​  - Physical changes

A physical change is a change that alters the physical properties of matter particularly the form and state. In many of such cases, the change is easily reversible.

Examples are boiling of water and melting of wax

A chemical change is a change in which a new kind of matter is formed. It is always accompanied by energy changes. The process is not easily reversible.

Examples are curdling of milk and photosynthesis.

Answer: the answer is think it yourself

Explanation:

Answer:

the planets would drift away from the sun into outer space

Explanation:

All celestial objects are attracted to each Other by gravity

Answer:

The planets would drift away from the Sun into outer space.

Explanation:

Answer:

the change in the system internal energy is 20 J

Explanation:

The computation of the change in the system internal energy is as follows:

Since the volume remains constant so the work done would be zero

Now the change in the internal energy is

= Heat given to system - work done

= 20 J - 0

= 20 J

hence, the change in the system internal energy is 20 J

The same is to be considered

Answer:

Atomic Number: 27 (Co, Cobalt)

Explanation:

4s2 is before 3d7*

Answer:

a) filtrate: a liquid which has passed through a filter.

Explanation:

the other one didnt pop up

Answer:

differences

Any compound with a pH value between zero to seven is considered acidic, whereas a pH value between seven to fourteen is a base. An acid is called a proton donor, while a base is called a proton acceptor (Kolb, 1978).

examples are:

baking soda is basic (pH = 9.0).

Orange juice is mildly acidic (pH = approximately 3.5)

The environment in your stomach is highly acidic (pH = 1 to 2).

Explanation:

hope that helps.... thanks

Answer:

A, B, D, E

Explanation:

did it on edg

Answer:

A. Making laundry detergent

B. Making dish detergent

D. De-hairing hides

E. Making paper

Explanation:

Answer:

It's A

Explanation: