The step of scientific method that would come after testing is?

Answer:

They have three to six valence electrons, so they can lose or gain electrons.

Explanation:

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Metalloids are metal like elements showing intermediate properties of gases and metals. They have three to six valence electrons, so they can lose or gain electrons. That's why they are conducting.

Metalloids are elements showing properties intermediate to that of metals and non-metals. They are located in the periodic table in between metals and nonmetals.

Metalloids appear as metals. They are shiny and conducting. However, their conductivity is low compared to metals and they are classified as semiconductors and they are all brittle in nature.

Boron, silicon, germanium, arsenic etc. examples of metalloids. They contains three to six valence electrons which can be delocalized or lost from the atoms.

These elements can lose electrons as well they can gain more electrons as per the bonding type. The delocalized valence electrons make them conducting. Hence option D is correct.

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Answer:

The proton and electrons are equal,

15protons and 15electrons

Explanation:

An atom is the smallest electrical neutral particle of an element so it means that every atom have same number of protons and electrons.

Answer:

The correct answer is B) They created new treaties and reservations that defined specific boundaries for each tribe

Explanation:

One of such acts which was used to reallocate the Native American Land was the General Allotment (Dawes) Act of 1887.

It gave permission to the Federal Government to modify the size and ownership structure of land belonging to the Native Americans. The end result was that the total amount of land originally belonging to the Native Americans reduced drastically over the next 500 years.

Cheers!

Answer:

This question is incomplete

Explanation:

The question is incomplete because of the absence of the table but since the question says there are data from an investigation about a plant growth and five other plants (making six) of the same type, the best way to display this type of data for analyst is to use the grouped bar chart. The grouped bar chart will display the data obtained (from an investigation on plant growth) from different students on each of the six plants (of the the same type).

Colours are usually used to identify the bars (of a group) or could be used to separate the group from other groups but in this case, colours are better used to identify the bars of a group.

Answer:

O₂ = 0.141

CO = 0.282

CO₂ = 0.577

Explanation:

The reaction of graphite with Oxygen is:

C(s) + O₂(g) → CO₂(g) + CO

All 5 moles of C(s) reacts producing CO₂ and CO. You can write:

5 moles = CO₂ + CO (1)

And, as pressure increased by 16.4% and initial moles of oxygen are 5.00 moles. Final moles (Moles of three gases) are:

5.00moles + 5.00moles*16.4% =

5.82 moles = O₂ + CO₂ + CO (2)

Also, there are 10 moles of oxygen in the container, that is:

10 moles = O₂*2 + CO₂*2 + CO (3)

From (2) and (1), moles of O₂ are:

O₂ = 0.82 moles

Replacing in (3)

10 mol = 0.82*2 + CO₂/2 + CO

8.36 moles = CO₂*2 + CO

5 moles = CO₂ + CO

By the sum of these equations:

3.36 moles = CO₂

And

5.0 moles - 3.36 moles = CO

1.64 moles = CO

As total moles are 5.84 moles, mole fraction of the gases is:

Answer:

In this simulation, you will be able to “see” several different forms of energy and the changes(transfers) that can occur between them.You are also able to work with a system where you canmanipulate the energy input, observe the process of electrical energy generation and manipulatethe output.Click on the “Energy Systems” tab.We will do all of our work here. Be sure to clickthe “Energy Symbols” box so the different types of energy will be visible throughout the process

We have that for the Question "Which energy output objects work with the solar panels" it can be said that  the energy output object that works with the solar panels is the

From the question we are told

Which energy output objects work with the solar panels?

Generally

Inverter

A Inverter is a device used in a solar installation system,with its primary work being conversion from DC(Direct current) to AC(Alternating Current)

Therefore

the energy output object that works with the solar panels is the

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Answer:

I'm not sure about this question but I think it C

Answer:

The correct answer is 0.6 mL.

Explanation:

We use the mathematical expression:

Ci x Vi = Cf x Vf

Where Ci is the initial concentration (5 M); Cf and Vf refers to final concentration (0.002 M) and final volume (1500 mL). With the given data, we calculate the initial volume (Vi):

Vi = (Cf x Vf)/Ci = (0.002 M x 1500 mL)/(5 M) = 0.6 mL

Therefore, we need 0.6 mL of 5 M NaCl to prepare the solution with the requested dilution.

Answer:

Boiling point: 63.3°C

Freezing point: -66.2°C.

Explanation:

The boiling point of a solution increases regard to boiling point of the pure solvent. In the same way, freezing point decreases regard to pure solvent. The equations are:

Boiling point increasing:

ΔT = kb*m*i

Freezing point depression:

ΔT = kf*m*i

ΔT are the °C that change boiling or freezing point.

m is molality of the solution (moles / kg)

And i is Van't Hoff factor (1 for I₂ in chloroform)

Molality of 50.3g of I₂ in 350g of chloroform is:

50.3g * (1mol / 253.8g) = 0.198 moles in 350g = 0.350kg:

0.198 moles / 0.350kg = 0.566m

Replacing:

Boiling point:

ΔT = kb*m*i

ΔT = 3.63°C/m*0.566m*1

ΔT = 2.1°C

As boiling point of pure substance is 61.2°C, boiling point of the solution is:

61.2°C + 2.1°C = 63.3°C

Freezing point:

ΔT = kf*m*i

ΔT = 4.70°C/m*0.566m*1

ΔT = 2.7°C

As freezing point is -63.5°C, the freezing point of the solution is:

-63.5°C - 2.7°C = -66.2°C

The the two important transport tissues in plants are xylem and phloem. The human body system which is like xylem is circulatory system.

An important transport tissue which is found in the vascular plants along with the phloem is defined as the xylem. The major role of xylem is to transport all the essential nutrients and water to leaves and stems from the roots.

There are mainly two types of xylem, they are primary and secondary. The xylem which is found during the primary growth of the plant is called the primary xylem and the secondary xylem is found in the plant's secondary growth.

The xylem transport the substances through passive transport which does not need any external energy. The vessel elements present in the xylem are found to be similar to the blood vessels in the human body.

The blood vessels of the circulatory system carries nutrients to all the organs and removes wastes from the organs. The arteries carry blood away from the heart and veins carry blood to the heart.

Thus the blood vessels in the circulatory system is analogous to the Xylem.

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Answer:

M = 87.71 amu

Explanation:

The masses of 4 isotopes of Strontium with abundance is as follows :

84 (abundance 0.50%), 86 (abundance of  9.9%), 87 (abundance of 7.0%), and 88 (abundance of 82.6%). Let M is the atomic mass of  Strontium. So,

[tex]M=0.50\%\ \text{of}\ 84+9.9\%\ \text{of}\ 86+7\%\ \text{of}\ 87+82.6\%\ \text{of}\ 88\\\\M=\dfrac{0.5}{100}\times 84+\dfrac{9.9}{100}\times 86+\dfrac{7}{100}\times 87+\dfrac{82.6}{100}\times 88\\\\M=87.71\ \text{amu}[/tex]

So, the  atomic mass of  Strontium is 87.71 amu.

Answer:

they are the same element because they have the same number of protons and electrons,but a different number of neutrons

Answer : The correct chemical equation is:

[tex]2NaBr(aq)+Pb(NO_3)_2(aq)\rightarrow PbBr_2(s)+2NaNO_3(aq)[/tex]

Explanation :

Balanced chemical equation : It is defined as the equation in which the atoms of individual elements present of reactant side must be equal to the product side.

According to the question, when sodium bromide reacts with lead nitrate then it reacts to give sodium nitrate and lead bromide as a products.

The balanced chemical equation will be:

[tex]2NaBr(aq)+Pb(NO_3)_2(aq)\rightarrow PbBr_2(s)+2NaNO_3(aq)[/tex]

Answer:

7.82*10^5

Explanation:

In scientific notation, there is only one number before the decimal and two numbers after, anything after that is counted towards the exponent next to the 10.

Because you move the decimal to the left 5 times to get one number before the decimal (7) your exponent is 5

Hope this helped,

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Answer:

Radon

Explanation:

n 1908 Ramsay and Gray, who named it niton, isolated the element and determined its density, finding it to be the heaviest known gas. It is essentially inert and occupies the last place in the zero group of gases in the Periodic Table. Since 1923, it has been called radon.

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. The correct option is option C.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.

In the two figure the number of electrons in the outermost shell or valence shell is 2. The group of periodic table that has valency 2, is the alkaline earth metals. So, the group number, the two atoms have in common.

Therefore, the correct option is option C.

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Explanation:

I know only P2O5 = Phosphorus pentoxide

When a saturated hydrocarbon loss a hydrogen involve an unsaturation it oxidises. Thus, when an organic molecule loses hydrogen atoms it is said to be oxidised.

Oxidation is the process of loss of electron or loss of hydrogen to change into the higher oxidation state. It can also said that reaction with oxygen is oxidation.

The gain of one or more electrons or hydrogen atoms is called reduction . Reduction make a reactant species in lower oxidation state. The species which is reduced is called reductant and the species which  is oxidised is called oxidant.

The group or atom which accepts a hydrogen or electrons from other species and oxidise them is called oxidising agents and the groups which give off their hydrogen or electron to other to reduce them is called reducing agents.

Hence, when an organic molecule loses hydrogen atoms it is said to be oxidised.

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Answer:

Explanation:

The direct reaction of a carboxylic acid with an amine would be expected to be difficult because the basic amine would deprotonate the carboxylic acid to form a highly unreactive carboxylate.

Answer:

48 minutes i think

Explanation:

Answer:

A cat that falls out of the window even if it seems to be doing well, must urgently go to a veterinary clinic in order to be placed under surveillance for at least 24 to 72 hours

Explanation:

Answer:

Explanation:

In the qualitative analysis of metal salts , we see that in group I , metal chlorides are precipitated out . It is so because their metal chlorides are insoluble in water  .

In this group following metal ions are present

Ag+,

Hg₂²⁺

Pb²⁺

Answer:

Global warming occurs a result of human activities which affects the environment negatively . It usually occurs over a long period of time. The global warming causes climate changes as a result of the ozone layer depletion.

If society took the threat of global warming seriously there will be changes in how humans handle the environment and the resources. Carbon emissions would be greatly reduced. Forest resources such as trees would also be treated specially and there would have been a reduction in mass deforestation as a result of urbanization

Answer:

1363cm

Explanation:

1m=100cm

13.63m= 13.63•100cm

13.63m=1363cm

water is watching over you

Answer:

it means the higher the water content in the air, the more moderate (less extreme) the climate is.

Answer:

See the answer below

Explanation:

The correct answer would be that the solute particles lower the solvent's vapor pressure, thus requiring a higher temperature to cause boiling.

Dissolving a solute particle in a solvent leads to a decrease in the vapor pressure of the solvent above the resulting solution when compared to the pure solvent. The lower the vapor pressure of a liquid, the higher the temperature required for the liquid to boil and vice versa. Hence, a higher temperature would be needed to boil a solvent with dissolved solutes.

Answer:

-184.6 KJ/mole

Explanation:

H2(g) + Cl2(g) ------------> 2HCl(aq)    

Δ H0 rxn = Δ H0f products - Δ H0f reactants

= 2×-92.3 - (0 + 0)

= -184.6KJ/mole

H2(g) + Cl2(g) ------------> 2HCl(aq)       Δ H0rxn   = -184.6KJ/mole

Given :

Hydrogen gas,[tex]H_2[/tex] , reacts explosively with gaseous chlorine, [tex]Cl_2[/tex], to form hydrogen chloride, HCl(g).

The standard enthalpy of formation of HCl(g) is −92.3 kJ/mol.

[tex]H_2(g)+Cl_2(g) - >2HCl(g)[/tex]

To Find :

The enthalpy change for the reaction of 2 mole of [tex]H_2(g)[/tex] with 2 mole of [tex]Cl_2(g)[/tex] if both the reactants and products are at standard state conditions .

Solution :

We know ,

[tex]\Delta H^o_{rxn}=\Delta H^{o}f_{products}-\Delta H^of_{reactants}\\\\\Delta H^o_{rxn}=2\times (-92.3)-(0+0)\\\\\Delta H^o_{rxn}=-184.6\ kJ/mol[/tex]

( Since , [tex]H_2[/tex] and [tex]Cl_2[/tex] are their most elementary form . So their enthalpy of formation is 0 kJ )

Therefore , the enthalpy change for the reaction of 2 mole of [tex]H_2(g)[/tex] with 2 mole of [tex]Cl_2(g)[/tex] if both the reactants and products are at standard state conditions is -184.6 kJ/mol .

Hence , this is the required solution .

Answer:

1. The oxidation half-reaction is: Mn(s) ⇄ Mn²⁺(aq) + 2e⁻

2. The reduction half-reaction is: Ag⁺(aq) + 1e⁻ ⇄ Ag(s)  

Explanation:

Main reaction: 2Ag⁺(aq) + Mn(s) ⇄ 2Ag(s) + Mn²⁺(aq)

In the oxidation half reaction, the oxidation number increases:

Mn changes from 0, in the ground state to Mn²⁺.

The reduction half reaction occurs where the element decrease the oxidation number, because it is gaining electrons.

Silver changes from Ag⁺ to Ag.

1. The oxidation half-reaction is: Mn(s) ⇄ Mn²⁺(aq) + 2e⁻

2. The reduction half-reaction is: Ag⁺(aq) + 1e⁻ ⇄ Ag(s)  

To balance the hole reaction, we need to multiply by 2, the second half reaction:

Mn(s) ⇄ Mn²⁺(aq) + 2e⁻

(Ag⁺(aq) + 1e⁻ ⇄ Ag(s)) . 2

2Ag⁺(aq) + 2e⁻ ⇄ 2Ag(s)  

Now we sum, and we can cancel the electrons:

2Ag⁺(aq) + Mn(s) + 2e⁻ ⇄ 2Ag(s) + Mn²⁺(aq) + 2e⁻

a plant that has flowers and fruits

Answer:

D.) Paper will burn

Explanation:

The first three are physical properties of paper, but the last one is a chemical property of paper