:D help please
A,B,C,or D

Answer:

[tex]\lambda=10^{26}\ m[/tex]

Explanation:

It is given that,

The frequency of the electromagnetic radiation, [tex]\lambda=3\times 10^{-18}\ Hz[/tex]

We need to find the frequency of the electromagnetic radiation. The relation between the frequency and wavelength is given by :

[tex]c=f\lambda\\\\\lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3\times 10^8}{3\times 10^{-18}}\\\\=10^{26}\ m[/tex]

So, the wavelength of the electromagnetic radiation is [tex]10^{26}\ m[/tex].

Answer:

A solar eclipse occurs when the moon gets between Earth and the sun, and the moon casts a shadow over Earth. A solar eclipse can only take place at the phase of new moon, when the moon passes directly between the sun and Earth and its shadows fall upon Earth's surface.

Explanation:

The Ancient Egyptians used simple sundials and divided days into smaller parts, and it has been suggested that as early as 1,500BC, they divided the interval between sunrise and sunset into 12 parts. ... Known as a clepsydra, it uses a flow of water to measure time.

Answer:

Ridges

Explanation:

Ridges separate watersheds

Hope this helped!

Answer:

In a chemical reaction, only atoms are present in the reactant and can end up with molecules. No new atoms are created and no more atoms are destroyed. In a chemical reaction, reactants contact with each other and the bond between atoms in the reactant is broken and atoms rearrange and form new bonds to make the product.

Explanation:

Answer:

C. both particle and a wave

Answer: C. Both a Particle and a Wave

Explanation:

Light can travel as particles or like waves. We can see it traveling like particles when a firefly glows. That is still a version of light. It travels as a wave when you turn on your light, faster than sound can. These are the two versions of light, particle and wave. The answer is C. Both a Particle and a Wave

formula p=m/V

Explanation:

0.79

6.35

1.79

To find the density you have to divide the mass by volume

hope it helps!

Answer:

Explanation:

Ionic compounds are compounds that are formed between a metal and non-metal with a significant electronegativity difference. The metals transfers their electrons to the non-metals and the electrostatic attraction of the ions brings about the bonding that forms the compound.

Ionic compounds are diverse in nature and form.

Here are some of their properties:

Answer:

Both A and B will be chemically unreactive

Explanation:

Answer:

C

Explanation:

Answer:

waning gibbous I belive

Explanation:

Answer:

third quarter moon

Explanation:

Answer:

they all have two electrons in their outermost shell

The elements of group 2 are alkaline earth metals that have two electrons in their outermost shell. So they have similar chemical and physical properties and tend to become positive ions in bond formation.

The elements present in group 2 include Beryllium, Magnesium, Calcium, Strontium, Barium, and Radium.  

The elements of group 2 are similar in their physical and chemical properties as all the elements have the same number of valence electrons. All alkaline earth metals are silvery-white-colored solids under normal conditions. They are also shiny and quite reactive.

The general electronic configuration of group 2 elements is ns². The alkaline earth metals have fully filled s-orbital in their valence shells, they tend to lose two electrons to produce cations with +2 charge.

Therefore, the elements of group 2 are electropositive in nature. Therefore, all the given statements about group 2 of the periodic table are true.

Learn more about elements of group 2, here:

https://brainly.com/question/20455446

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Answer:My guess is the gravitational force between the objects or substances.

Answer:

Decrease

Explanation:

The lower you go, the colder because the sun can't reach lower levels of the ocean.

Answer:

decrease

Explanation:

less sunlight will be able to reach the farther down you go and the less sunlight there is the colder it gets

Answer:

0.01504 mol/dm3

Explanation:

Calcium Hydroxide - Ca(OH)2

Hydrochloric acid - HCl

The reaction between both is given as;

2HCl   +   Ca(OH)2   --> CaCl2  + 2H2O

2   :  1

The relationship between the concentration and volume is given as;

CaVa  /  CbVb = na  /  nb

where a = acid (HCl) and b = base Ca(OH)2

Inserting the values;

0.04 * 18.8  /  (Cb * 25)  =  2 / 1

0.752 / 25Cb = 2

Cb = 0.752 / 50  = 0.01504

Answer:

b.) potential energy was transformed into kinetic energy

Explanation:

According to the law of conservation of energy, energy is neither created nor destroyed but transformed from one form to another in a system.

So, in this system, energy is not created neither is it destroyed.

Explanation:

Electrical energy is produced by power plants.

The Light which comes from the Sun.

Chemical energy that is formed in magma.

Nuclear which is stored in the nucleus of an atom.

Geothermal which comes from solar.

Fuel is an inexhaustible resource.

Potential is the energy of position.

Answer: Try mass that’s the best guess I can give off the top of my head

Explanation: An atom is the smallest unit of matter that retains all of the chemical properties of an element. Atoms come together which forms molecules. These molecules interact to form solids, gases, or liquids.

Answer:

One oxygen atom I think..as C10 is 10 atoms of carbon, and H20 is two atoms of hydrogen with one atom of oxygen

Explanation:

Answer:

I believe the answer is A

Explanation:

I hope this helps :)

Answer:

Explanation:

In this chemistry lab, students investigate how to build and launch a simple rocket that uses hydrogen and oxygen gases that will be mixed to propel the rocket (large bulb plastic pipette). Students will understand the principles of combustion reactions, kinetics, stoichiometry of reactions, activation energy, explosive mixtures, rocketry, and different types of chemical reactions. Students will explore and determine the proportions of hydrogen and oxygen mixture that will achieve the best launch results. Students will compare the balanced chemical reaction of hydrogen and oxygen with their lab results; students should discover that the optimal distance occurs when the mixture of hydrogen and oxygen is two to one hydrogen, oxygen mixture ratio and this can be determined theoretically from the balanced chemical reaction equation. Students will perform the lab, collect data, and discuss, compare, and contrast their lab findings with the balanced chemical reaction equation. Students will present their structured inquiry investigations using a power-point presentation. Other groups along with the teacher will assess each group by using a provided rubric. Group assessments will be the deciding assessment for the final lab score. A follow up activity could investigate how NASA scientists launch real rockets into space and propose a procedure to investigate and collect data on a launching a heavier object at the school football field.

Answer:

lipid bilayer

Explanation:

I looked it up .

Answer:

P O 2 = 5.21 atm P C O 2 = 4.79 atm

Explanation:

Hope it helps!

Answer:

3.56x10²³ atoms

Explanation:

To solve this question we need first to determine the moles of iron (II) chloride, FeCl₂, using its molar mass. Then, using Avogadro's number we can solve for the number of atoms:

Moles FeCl₂ - Molar mass: 126.751g/mol-

25g FeCl₂ * (1mol / 126.751g) = 0.1972 moles

Number of atoms:

1 mole of FeCl₂ are 6.022x10²³ molecules of FeCl₂, that means 0.1972moles are:

0.1972mol * (6.022x10²³ molecules / 1mol) = 1.188x10²³ molecules of FeCl₂

In 1 molecule of FeCl₂ there are 3 atoms (1 of Fe and 2 of Cl), in 1.188x10²³ molecules of FeCl₂ there are:

1.188x10²³ molecules of FeCl₂ * (3atoms / molecule) =

Answer:

1. Convection current

2. Convective heat transfer

3. The Atmosphere

4. Air pressure