What is the order of decreasing reactivity of these 4 metals?

Answer:selenium

Explanation:

Answer: Nether

Explanation: Because if you have one pound of Calcium and one pound of selenium there both the same weight  

presence of heat can change solid tu liquid

and liquid to gas

Answer:

Devin's problem can be solved by exploiting the activity series of metals.

Explanation:

This determines what metals are more reactive and would be readily displaced in a reaction.

Seeing as they are both metals scraps of similar sizes, filtration isn't a solution.  But since Copper is lower on the activity series than Aluminium, adding an acidic solution (say tetraoxosulphate VI solution) to the mixture, would have aluminium in solution and Cu as residue which can then be filtered off.

I hope this was helpful.

Answer:

Liquids and gases show random movements because of potential and kinetic energy.

It happens when heat is applied to the particles and they gain more potential and kinetic energy and move around faster. With gases, they have the most energy.

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Answer:

The particles show random motion because liquid and gas particles do not have a rigid structure, unlike solid particles. They are free to go anywhere.  

Explanation:

Answer:

1/2

Explanation:

According to this question, the gene coding for fur color in rabbits contains two alleles viz: alelle for brown fur ( B) is dominant, while the allele for black fur ( b) is recessive. This means that an heterozygous rabbit (Bb) will have brown fur.

Based on the question, one rabbit has the dominant allele for brown fur and the recessive allele for black fur i.e genotype Bb, another rabbit has two recessive alleles i.e. genotype bb. If these two rabbits cross i.e. Bb × bb, the proportion of the offsprings produces will have Bb, Bb, bb and bb genotype.

Bb is dominant, hence, 1/2 of the offsprings will be brown furred.

one species of rabbit, . the two rabbits have offspring, what are the

Answer:

For CH3Br, there are a total of 14 valence electrons. Hydrogen always goes on the outside, and since Carbon is less electronegative than Bromine, we'll put the Carbon in the center and the Bromine on top. We have 14 valence electrons for the CH3Br Lewis structure. Put two between atoms to form chemical bonds.

Explanation:

Answer:

A polypeptide chain!

Explanation:

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Amino acids are the fundamental building blocks of proteins. In the cell, amino acid molecules combine to form polypeptide chain or protein.

The term amino acids are defined as the building block of the protein. Amino acids are the fundamental building blocks of proteins. Their molecule contains both an amino and a carboxylic group.

Alpha-amino acids are amino acids that have an amino and a carboxyl group attached to the same carbon atom, i.e., an alpha-carbon atom. Glycine, Alanine, etc.

Proteins are made up of monomers called amino acids. A protein is composed of one or more linear chains of amino acids, each of which is referred to as a polypeptide.

Thus, In the cell, amino acid molecules combine to form polypeptide chain or protein.

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Answer:

the 2 means there are 2 al and the 3 means there are 3 o

Explanation:

I hope this helps

Answer:

False

Explanation:

Water molecules are spread up but slightly, enough that none of the molecules actually move freely around each other. Only gas and plasma molecules are very spread apart.

Answer:

wind and water erosion

Answer:

C is the answer

Answer:

See explanation

Explanation:

The general formula used to obtain the frequency of a wave is;

v=λf

where;

v = speed of the wave

λ= wavelength of the wave

f= frequency of the wave.

Now, the speed and wavelength of light in various media are known.

If we plug the value of the speed of light and the wavelength of light into the formula given above, we can obtain the frequency of light.

The frequency of a photon of light can also be obtained from Plank's equation;

E= hf

where;

E =energy of the photon of light

h = Plank's constant

f= frequency of the photon.

This is used when the energy of the photon of light is supplied or can be calculated using the wavelength of light provided in the problem.

Answer:

solid

liquid

Gas

plasma

Highest to lowest energy : plasma, gas, liquids, solids

Answer: Proteins are known as biomolecules and biomolecules are made of the elements Carbon, Hydrogen, Nitrogen, and Oxygen and the monomers of proteins are known as amino acids.

Answer:

In order for people to survive, we need water. If we wanted to live on the moon, we would need water.

Answer:

Gravity

Explanation:

So water on the moon turns into fine ice dust, when you pour it.

Hey there!:

Mass = 17.92 g

Volume = 2.00 mL

Density =  ??

Therefore:

D = m / V

D = 17.92 / 2.00

D = 8.96 g/mL

Hope this helps!

The density of an object is obtained as the ratio of mass of an object to its volume.

In science, density is defined as mass per unit volume. The volume of an object is the same as the volume of water displaced by the object.

Since the volume of water rose by 2.00 mL, then the volume of copper is 2.00 mL.

The density is now; mass/volume

Mass = 17.92 g

Density = 17.92 g/2.00 mL

= 8.96 g/ml

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Answer:

Pizza is difintly a mixture the other i have no idea..im pretty sure CO2 is a substance btw im sorry I wish I could help more Hope this helps! :)

Explanation:

Answer:

Mixture

?

Pure

Pure

Pure

Pure

Mixture

Mixture

Pure

Pure

Mixture

Pure

Explanation:The answers are on google. Im not sure what they mean by hunter.

Answer:

The law of conservation of mass states that no atoms are lost or made in a chemical reaction. Instead, the atoms join together in different ways to form products . This is why, in a balanced symbol equation, the number of atoms of each element is the same on both sides of the equation.

Answer:

Protons and neutrons

Explanation:

The particles to forms the nucleus of an atom are the protons and neutrons of the atoms.

These materials are located in the tiny nucleus and contributes the most mass of the atom.

Answer:

Calculate the rate of decay constant for U-238 if its half-life is 4.468 × 109 years. Answer: If the problem is referring to the half-life, then the ratio of = 0.5 because half of the original sample has already undergone decay.

Explanation:

Answer: The results of the experimental observations should coincide with the facts of the current theories.

Explanation:

The scientific theory can be defined as the well defined as supported explanation for a natural phenomena. It is based upon the facts observed and also supported by the evidences obtained from the experimental trials.

If the experimental observations do not match with the concept of current scientific theory then the scientific either perform the experiment with the same scientific methodology or can switch to another scientific methodology to satisfy the facts of the current theories.

Answer:

19. Physical

20. Physical

21. Chemical

22. Physical

23. Chemical

24. Chemical

25. Physical

Explanation:

Answer:

[tex]711\ \text{mmHg}[/tex]

Explanation:

[tex]P_{total}[/tex] = Total pressure = 751 mmHg

[tex]P_{water}[/tex] = Vapor pressure = 40 mmHg

[tex]P_{gas}[/tex] = Pressure of gas

The total pressure in a system is given by Dalton's law

[tex]P_{total}=P_{gas}+P_{water}\\\Rightarrow P_{gas}=P_{total}-P_{water}\\\Rightarrow P_{gas}=751-40\\\Rightarrow P_{gas}=711\ \text{mmHg}[/tex]

The partial pressure of the hydrogen is [tex]711\ \text{mmHg}[/tex]

Answer:

80°F

Explanation:

Lukewarm means moderately warm. 80°C (176°F) water is extremely hot and could burn someone. 80°F (26 2/3°C) is moderately warm.

Answer:

bf v

Explanation:

bgf

Answer:

λ = 4.2x10^-13 m

Explanation:

c = λν

c is speed of light 3x10^8 m/s

λ is wavelength

ν is frequency

3.10^8 = λ . 7.13 × 10^20

λ = 4.2x10^-13 m

Answer:

B.

City residents will have adequate health care and hospital services.

Explanation:

the correct answer for edg 2020

Answer:

B

Explanation:

Answer:

"Earth-centered," or "geocentric" Ptolemy thought that all celestial objects — including the planets, Sun, Moon, and stars — orbited Earth. Earth, in the center of the universe, did not move at all.

Explanation:

Answer:

Geocentric

Explanation:

Its the belief that earth was the center of the solar system instead of the sun

Explanation:

Because the panthers live in the southeastern region of the United states they have increased in population in that region. They have been able to gain more food and have adapted more to there environments. Which allows to increase and reproduce more. That is why the Panthers in the southeastern United states have increased In population.     I hope this works for you and that it helps. I don't mind helping someone who has a question! From, me.

A population of panthers lives in the southeastern United States. Over 50 years, the size of the panther population in the region increased. More panthers were born than died explains the increase in the size of the panther population.

The jaguar, also known as the panther, tigre, or onza, is the world's largest and most powerful cat. Human activities endanger this cat, as they do the Florida panther (Puma concolor).

Because the anteater population will have fewer energy storage molecules available due to the smaller ant population, the anteater population will reproduce less.

Panthers can be found in the southeastern United States. The region's panther population has grown over the last 50 years. Because no animal eats panthers, the panther population is always growing.

Thus, More panthers were born than died explains the increase in the size of the panther population.

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Answer:

magnesium + water == magnesium oxide + hydrogen