Can you please help me this is due today and I really need help.

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.

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:

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:

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:

Atomic Number: 27 (Co, Cobalt)

Explanation:

4s2 is before 3d7*

Answer:

Explanation:

Love the pfp

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:

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 answer is think it yourself

Explanation:

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:

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:

fluorine

Explanation:

hope it helps

Answer:

C.

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:

Answer below:)

Explanation:

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

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:

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.

More on diffusion rate of gases can be found here: https://brainly.com/question/2967915

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:

It's A

Explanation:

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:

Learn more at: https://brainly.com/question/23693316?referrer=searchResults

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:

The answer is B

Explanation:

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

Answer:b

Explanation:

Answer:

exosphere thermosphere mesosphere stratosphere troposphere

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.

To learn more about the matter, follow the link;

https://brainly.com/question/3764450

#SPJ2

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:

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

Explanation:

the other one didnt pop up

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:

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