Which is not an example of a compound?
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Answer:

Group 1 metals and transition metals are different from each other, mainly based on the colour of the chemical compounds that they form. The key difference between group 1 metals and transition metals is that the group 1 metals form colourless compounds, whereas the transition metals form colourful compounds.

The amount of Mg(OH)2  present after the reaction is complete is 0.136 moles of Mg(OH)2.

The equation of the reaction is;

2HNO3(aq) + Mg(OH)2(aq) -------> Mg(NO3)2(aq) + 2H2O(l)

Number of moles of Mg(OH)2 = 8.00 g/58 g/mol = 0.138 moles

Number of moles of HNO3 = 0.205 M × 24.2 mL/1000 = 0.00496 moles

Given that;

2 moles of HNO3 reacts with 1 mole of Mg(OH)2

0.00496 moles of HNO3 reacts with 0.00496 moles ×  1 mole /2 moles = 0.00248 moles of Mg(OH)2

Hence, Mg(OH)2 is the reactant in excess.

The amount of Mg(OH)2 remaining = Amount present - Amount reacted

Hence; 0.138 moles - 0.00248 moles = 0.136 moles of Mg(OH)2

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Answer:

6 Electrons r smaller than a proton or a neutron

Answer:

1st and last one

Explanation:

you will divide 36 by 1 and multiply 2 on both sides which makes 72 by 2 so 2into 1 is 2 and 2 into 36 is 72

Answer:

110.91982

The element is probably Barium

The atomic number of an atom is equal to the number of protons it has. In this case, the ion has 56 protons. Therefore, the atomic number of the ion is 56.

The atomic number or nuclear charge number (symbol Z) of a chemical element is the charge number of an atomic nucleus. For ordinary nuclei composed of protons and neutrons, this is equal to the proton number (np) or the number of protons found in the nucleus of every atom of that element. The atomic number can be used to uniquely identify ordinary chemical elements. In an ordinary uncharged atom, the atomic number is also equal to the number of electrons.

For an ordinary atom which contains protons, neutrons and electrons, the sum of the atomic number Z and the neutron number N gives the atom's atomic mass number A. As there are 56 protons thus the atomic number of the ion is 56.

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The medullary index of hair is the ratio of medullary diameter to the diameter of hair. Thus the medullary  of  hair with 110 microns and medulla diameter of 58 microns is 0.533. This is an animal hair.

Medullary index of hair is the ratio of diameter of the medullary part and the diameter of the hair strand. From this value, we can identify whether the sample hair is of humans or animals.

Hair is made proteins called keratin. The protein structure of hair vary from human to  human even one hair strand to the other and similar way it is different in animal hair too.

The hair strand of humans are thin than the hair strands of animals. Thus the medullary index of humans is 0.333 or less. If the index is 0.50 or greater it is of animals.

Here the diameter of hair is 110 microns and that of medulla is 58 microns thus medullary index is 58/110 = 0.55 microns. Which means that it is an animal hair.

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Answer:

a combination of two or more elements that are combined in a certain ratio

Explanation:

A chemical compound is a chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds. A molecule consisting of atoms of only one element is therefore not a compound.

Answer:

Well 50 of course

Explanation:

5 days per tasks is like saying 10 times 5 which is 50.

Answer:

NH4+ ammonium ion hydroxide ion

SO32- sulfite ion perchlorate ion

NO3- nitrate ion chlorate ion

NO2- nitrite ion chlorite ion

Answer:

A

Explanation:

I just did learned all about this

Answer:

: Each has four valence electrons, but germanium will at a given temperature have more free electrons and a higher conductivity. Silicon is by far the more widely used semiconductor for electronics, partly because it can be used at much higher temperatures than germanium

Explanation:

have a great day

Explanation:

Solids have a definite shape and volume. Liquids have a definite volume, but take the shape of the container. Gases have no definite shape or volume.

The kinetic theory of matter (particle theory) says that all matter consists of many, very small particles which are constantly moving or in a continual state of motion.

Answer:

Option D

Explanation:

Solubility is the amount of a substance in a solvent that dissolves at a specific temperature. So knowing this you would know that generally when you increase the temperature it also increases the solubility of a substance which means the answer is option D or "Solubility generally increases with heat.​"

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Answer:

D.) Solubility generally increases with heat

Explanation:

I got it correct on founders edtell

Answer: The answer is 457.9

Explanation: Realistically all you have to do is add both of the temperatures and then you can figure out the original heat. Since the heat drops 426.7 degrees and it comes to 31.2 degrees its 426.7 + 31.2 = 457.9.

Answer & Explanation:

For the water to H2 and O2 problem:

1) Reactant is H20, it is to the left of the arrow.

2) Products are H2 (gas) and O2 (gas) because it is to the right and what is created.

For the CO2 + water -> Glucose + Oxygen problem:

1) Reactant is CO2 and H2O, it is to the left of the arrow and what is being changed.

2) Products are C6H12O6 (glucose) and O2 (gas) because it is to the right and what is created.

Answer:

A Force.

Explanation:

A force is a push or pull upon an object resulting from the object's interaction with another object. ... Forces only exist as a result of an interaction.

Answer:

1800g

Explanation:

b/c d=m/v

m=dv

m=300×6=1800g

The mass of the liquid in the container is equal to 1800 g.

The density of an object can be described as the mass per unit volume of the object. The average density of any substance equals the total mass of the substance divided by its total volume.

The mathematical formula of the density can be expressed as follows:

The density of material = Mass/Volume

Mass = density × Volume

The S.I. unit of the density of any substance is Kg/m³ and it is an intrinsic property. If the size of the substance increases, the mass increases as well but the density of the substance will stay constant.

Give, the density of the liquid, d = 6.0 g/cm³

The volume of the container, V = 300 cm³

The mass of the liquid = 6 ×300 = 1800 g

Therefore, the mass of the liquid is equal to 1800 g.

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Explanation:

Endogenous pathway for lipid metabolism: VLDL is formed in the liver from triglycerides and cholesterol esters. ... In the liver, LDL is converted into bile acids and secreted into the intestines. In non hepatic tissues, LDL is used in hormone production, cell membrane synthesis, or stored.

Answer:

heat energy

Explanation:

heat give energy so heat carriers energy

Nitrogen is one of the major elements that are cycled in nature. The major sink for nitrogen in nature is the atmosphere.

Biogeochemical cycles in nature show the diverse ways that elements move through the various spheres on earth.

Nitrogen is trapped from the atmosphere by nitrogen- fixing bacteria that live in the root noodles of leguminous plants which convert atmospheric nitrogen to nitrates. This nitrogen is transferred to living organisms when they eat those plants and become incorporated into biomass.

Decomposition returns this nitrogen in biomass to the soil. The action of denitrifying bacteria converts nitrates in soil back to atmospheric nitrogen. Also several anthropogenic sources release nitrogen into the atmosphere as NOx.

The atmosphere consists of 78% nitrogen hence it serves as the largest sink for nitrogen in nature.

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Answer: B. It is based on multiple observations.

Explanation:

Newton's first law of motion is considered  a law  and not a theory because it is based on multiple observations.

Observations are defined as a set of statements or facts which are recorded while conducting an experiment.Observations are made through sensing changes in the variables of the experiment.

It is specifically defined as an act of knowing or recording the changes in the variables of the experiment.Recording observations holds importance as recording observations avoid the experiment to be repeated over and over again.

It is important to note down observations so that the testing of hypothesis is made easier.There are four types of observations .Observations need to be descriptive and must be written in complete sentences and should include all the numerical data of the experiment.

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The titration using permanganate in acidic solution because it can be act as behave indicator.

Titration is a typical quantitative chemical analysis procedure used in laboratories to quantify the concentration of a specified analyte. The titrant or titrator is a substance that is manufactured as a standard solution with a given concentration as well as volume.

Permanganate titrations must be performed in a strong acid solution. Because [tex]HNO_{3}[/tex] and HCl might involve in competing for a redox reaction, lowering the accuracy of the titration, sulfuric acid is commonly utilized. Titration permits food manufacturers to calculate the amount of a reactant present in a sample.

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Answer:

Answer:

Because all machines lose input work to friction, one way to improve the efficiency of a machine is by reducing friction. Oil is used to reduce friction between the moving parts of car engines. The use of oil makes engines more efficient. Another machine that loses input work is a bicycle.

Explanation:

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The factor which increases as the efficiency of a machine increases is: work output.

Efficiency can be defined as a ratio of work (energy) output to work (energy) input.

Mathematically, the efficiency of a machine is given by the formula:

[tex]Efficiency = \frac{W_O}{W_I} \times 100[/tex]

Where:

Work can be defined as the amount of energy required to move an object from one point to another.

Hence, the work done by a machine is the product of the perpendicular force acting on the machine and the distance it covers or travels.

Ideally, the work output of a machine is highly dependent on its efficiency and as such, it is a factor which increases as the efficiency of a machine increases

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