Which need, want value, or interest was most likely involved in the
development of the device shown?
A. A lack of parking spaces for cars
B. A way to read license plates from afar
C. A safe and fair driving environment
D. A well-funded police department
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Answer:

exosphere thermosphere mesosphere stratosphere troposphere

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

Answer:

C. It increases to 4 times its original magnitude.

Explanation:

If the distance between two objects is cut in half, the gravitational force between them is increased by 4 times the original magnitude.

From Newton's law of universal gravitation, the gravitational force of attraction between two bodies is directly proportional to the product of their masses and inversely proportional the the square of their masses.

lt the original distance  = 4

Fg  = [tex]\frac{x }{4^{2} }[/tex]

New distance  = 3

  Fg = [tex]\frac{x}{2^{2} }[/tex]  

So;

          [tex]\frac{x}{2^{2} }[/tex]  /    [tex]\frac{x }{4^{2} }[/tex]  = 4

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:

30.06904

Explanation:

C3H4: Mass % C = 36.033 x 100 / 40.0641 = 89

Answer:

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

Explanation:

the other one didnt pop up

Answer:

B: Helium is 0.316x faster

If equal amounts of helium and argon are placed in a porous container and allowed to escape, helium will diffuse 3.16x faster than argon.

According to Graham's law of diffusion of gases, the rate of diffusion of a gas is inversely related to the square root of its molecular weight.

Mathematically, when two gases are being compared;

            r1/r2 = √m2/√m1

Where r1 = diffusion rate of gas 1, r2 = difussion rate of gas 2, m1 = molar weight of gas 1, and m2 = molar weight of gas 2.

Molar weight of helium = 4

Molar weight of argon = 39.9

Hence,

              r helium/r argon = √39.9/√4

                                      = 6.317/2

                                        = 3.16

Therefore, 3.16 x r argon = r helium.

In other words, helium will diffuse 3.16x faster than argon.

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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:

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:

crumpling of a piece of paper

Explanation:

chemical change cannot be reversed or gootten back

Answer:

Baking brownies!

Explanation:

The mixture of the ingredients undergoes a chemical change when it's heated and the substance changes very much so, melting a candle may seem like a similar change, but the wax is the exact same when it cools back down

Answer:

4Fe  +  3O₂   →   2Fe₂O₃

Explanation:

The chemical reaction is given as:

          Fe  +  O₂   →   Fe₂O₃

To balance an equation implies that the number of atoms and moles must be conserved.

  using the coefficients a,b and c, let use a mathematical approach to balance the expression;

           aFe  +  bO₂   →   cFe₂O₃

Conserving Fe: a  = 2c

                     O: 2b  = 3c

let c  = 1, a  = 2 , b  = [tex]\frac{3}{2}[/tex]  

  multiply through by 2 ;

         a  = 4, b  = 3 and c = 2

                  4Fe  +  3O₂   →   2Fe₂O₃

Answer: C - The iron becomes harder and stronger

Explanation:

The pure iron when mixed with the carbon then steel is formed which is the interstitial alloy of iron. About 0.002%- 2.1% (m/m) of carbon. The carbon atoms being smaller than the iron atom occupy the interstitial spaces or interstices in between the iron atoms. Thus these carbon atoms introduce imperfections in the iron crystal layer. The iron crystal layers become harder and they slide past one another and the iron becomes harder.

Answer:

Nonmetals and Nonmetals

Explanation:

Covalent bonding is when atoms share valence electrons. Nonmetals typically have 4, so two atoms can bond to have the total of 8.

Covalent bonds are most likely to form between atoms of this type of chemical elements: D. non-metals and non-metals.

A covalent bond can be defined as a bond that exists in chemical compounds and it typically involves the sharing of electrons between the atoms of a non-metallic chemical element.

In Chemistry, there are two (2) main types of covalent bond and these include:

Generally, a covalent bond is a type of bond that is commonly formed between two (2) non-metals while an ionic bond is usually formed between metals and non-metals.

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Answer:

fluorine

Explanation:

hope it helps

Answer:

k

p

p

k

k

I believe.. ............

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:

²⁰²Hg₈₀ ----> ²⁰²Tl₈₁ + ⁰₋₁e

Explanation:

The radioactive decay of the atom of an element by the emission of a beta-particle is equivalent to the splitting of a neutron in the nucleus of the radioactive element into an electron and a proton. The proton is retained by the nucleus whereas the electron is emitted as a beta-particle. This retention of the proton results in an increase of the atomic number by 1. A beta-particle is an electron. The electron is a very light particle and its loss makes no significant change in the mass number of the atom involved.

The beta decay of Hg-202 results in an increase of the atomic number from 8-0 to 81. Hence, Hg-202 is transformed to Tl-202. the balanced nuclear equation is given below:

²⁰²Hg₈₀ ----> ²⁰²Tl₈₁ + ⁰₋₁e

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 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:

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:

It's A

Explanation:

Answer:

C. Involves a metal and a nonmetal.

Explanation:

Ionic compound involves a metal and a non-metal. Ionic compounds have electrovalent bonds between them.

These compounds are usually made up of metals and non - metals combining to form a unit.

Answer:

Oxygen and positive charge.

Explanation:

The value of electronegativities of oxygen is higher than hydrogen due to which a slight negative charge occur on its oxygen atom and a slight positive charge on its hydrogen atoms of water molecule. The water is polar in nature because oxygen attract the shared pair of electron that leads to partial negative charge on oxygen while on the other hand, the hydrogen atom has acquire partial positive charge.

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

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:

Explanation:

Love the pfp

Answer: the answer is think it yourself

Explanation:

Answer:

See explanation

Explanation:

A reaction in which heat and light are produced is a combustion reaction. Combustion is said to have occurred when a substance is burnt in oxygen.

The balanced equation of the reaction is;

4Li(s) + O2(g) ------->2Li2O(s)

This reaction is exothermic because heat was produced. The reaction has a low activation energy as the metal easily burst into flames in oxygen. A catalyst is not needed in this reaction because it has a low activation energy.

According to the law of conservation of mass. Atoms are neither created nor destroyed in a chemical reaction. What this means is that in a chemical reaction, the number of atoms of each element on the left hand side must be the same as the same as the number of atoms of the same element on the right hand side.

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

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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