what trend in the periodic table should be expected as the atomic number of the halogens increase from fluorine to iodine

Answers

Answer 1

Answer: Well one can expected many trends
1) Reactivity and Electronegativity decreases
2)Melting and Boiling point increases
3)There is an increase in colour intensity due to the progressive shift to longer wavelengths in the spectrum of light
4) The intramolecular attraction increase and as such there is a progressive shift from gas to solid
5)Increase in oxidising power
6) Atomic and ionic radii increases
7) Electrode potential decreases

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The element carbon is found on the right side of the periodic table and is known as a _________, which means that it is normally a poor conductor of heat and electricity and is dull and brittle.

Which must be a mixture of substances?
1. solid
2. liquid
3. gas
4. solution

Answers

the one that must be a mixture of substance is : 4. Solutionhere are some examples that proof option 1 - 3 could consist only with a single substance :Solid = Fe ( most commonly known as iron)Gas = He ( Most commonly known as helium)Liquid = Hg (most commonly known as mercury)

4.Solution

Further explanation

Mixtures are materials composed of two or more kinds of substances that still possess their original properties. Mixtures can also be said to represent a combination of several substances, elements or compounds

There are two types of mixtures, i.e., homogeneous mixture (or solution) and heterogeneous mixture.

Homogeneous mixture: mixture which each part contains a similar amount of solute, for example, vinegar acid solution, sugar solution, and salt solution.
Heterogeneous mixes: mixtures of which each part contains an unequal amount of solute, for example, river water, sewage water, and coffee drinks.

The solution is a homogeneous mixture of two or more substances that dissolve one another and each of the constituent substances cannot be distinguished physically anymore.

The solution consists of two components, i.e., solute and solvent.
For example, a salt solution consists of salt as a solute and water as a solvent.

In chemistry, we already know the phase of matter or state of matter, i.e., solid (s), liquid (l), gas (g), and aqueous (aq). Every chemical solution in a reaction is labeled as an aqueous phase, e.g, $\boxed{ \ NaCl_((aq)) \ }$ as a salt solution.

Consider the following examples:

$\boxed{ \ Fe_((s)) \ }$ as a solid metal iron, an element.
$\boxed{ \ H_2O_((l)) \ }$ as liquid water.
$\boxed{ \ H_2O_((s)) \ }$ as ice solids.
$\boxed{ \ H_2O_((g)) \ }$ as water vapor with a gaseous phase.
$\boxed{ \ H_2O_((l)), H_2O_((s)), H_2O_((g)) \ }$ are compounds of the same chemical formula but different phases.

Learn more

About the mass and density of substances brainly.com/question/4053884
Calculating the pH value of weak base brainly.com/question/9040743
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Keywords: which must be, a mixture of substances, solid, liquid, gas, solution, homogeneous, heterogeneous, phase of matter, state, aqueous, salt, water

Which organic compound is most soluble in water? A) ethyne B) benzene C) butane D) ethanol

Answers

I think it's between B) Benzene and C) Butane

Which of these pairs would form an ionic bond?-K and Br-C and H-H and O-Cu and Cu

Answers

The pair K and Br would form an ionic bond because K is a metal and Br is a non metal.

To answer your question about which of these pairs would form an ionic bond, let's look at each pair:

1. K (Potassium) and Br (Bromine) - K is a metal and Br is a non-metal. Metals tend to lose electrons, while non-metals tend to gain electrons. This transfer of electrons results in an ionic bond. Therefore, K and Br would form an ionic bond.

2. C (Carbon) and H (Hydrogen) - Both are non-metals, so they tend to share electrons, forming a covalent bond instead of an ionic bond.

3. H (Hydrogen) and O (Oxygen) - Both are non-metals, and they also tend to share electrons, forming a covalent bond rather than an ionic bond.

4. Cu (Copper) and Cu (Copper) - Since they are the same element and both are metals, they do not form an ionic bond.

In summary, the pair K and Br would form an ionic bond.

To understand what is ionic bond : brainly.com/question/957239

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Limestone is primarily a crystal form of caco 3 . How many moles of oxygen are in a 1.25 mol sample of caco 3 ? Only include the numerical value in your answer. Do not include units.

Answers

There are 3.75 moles of oxygen in a 1.25 mol sample of CaCO₃.

Limestone is primarily a crystal form of CaCO₃ (calcium carbonate). According to its chemical formula, the molar ratio of CaCO₃ to O is 1:3. The moles of oxygen in 1.25 moles of CaCO₃ are:

$1.25 mol CaCO_3 * (3molO)/(1molCaCO_3) = 3.75molO$

There are 3.75 moles of oxygen in a 1.25 mol sample of CaCO₃.

You can learn more about molar ratios here: brainly.com/question/9408497

As the molecular formula of CaCO₃ suggested, that there are 3 moles of oxygen are there in 1 mole of CaCO₃.

So in 1.25 mol of CaCO₃ contains=1.25 ×3 moles of oxygen

=3.75 moles of oxygen

So there are 3.75 moles of oxygen are there in 1.25 mol of CaCO₃.

Each glucose molecule consists only of carbon, hydrogen, and oxygen atoms. If each molecule contains 53.3% oxygen and 6.7% hydrogen by mass, what percentage of each glucose molecule is made up of carbon?

Answers

53.3% + 6.7% = 60%, 100% - 60% = 40%. 40% of glucose is made of carbon. Since there are only three types of atoms in glucose, and the amount of hydrogen and oxygen is already given, this means that whatever percentage is left (40%) has to be carbon.

In addition to white blood cell,_____ also help fight bacteria and disease.

Answers

The white blood cells are the ones who leave the blood and enter tissues to fight off pathogens and invaders. They are not platelets because platelets help the healing of wounds and prevent it from bleeding by forming blood clots on the wounded area. They are not red blood cells because they carry oxygen all throughout the body organs. And they are not capillaries because capillaries are the ones that transports the oxygenated blood into the arteries.

antibodies is your answer

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