Look at the periodic table below. Which of the following lists of elements forms a group on the periodic table?

periodic table

Group of answer choices

Sc, Ti, V, C

Answer:

3 moles

Explanation:

Answer:

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:

1) The light microscope. The common light microscope used in the laboratory is called a compound microscope because it contains two types of lenses that function to magnify an object. The lens closest to the eye is called the ocular, while the lens closest to the object is called the objective. Most microscopes have on their base an apparatus called a condenser, which condenses light rays to a strong beam.

2) Other light microscopes. In addition to the familiar compound microscope, microbiologists use other types of microscopes for specific purposes. These microscopes permit viewing of objects not otherwise seen with the light microscope.

3) The fluorescent microscope uses ultraviolet light as its light source. When ultraviolet light hits an object, it excites the electrons of the object, and they give off light in various shades of color. Since ultraviolet light is used, the resolution of the object increases. A laboratory technique called the fluorescent‐antibody technique employs fluorescent dyes and antibodies to help identify unknown bacteria.

Answer:about 10,000 years b maybe

Explanation:Strontium-90 and cesium-137 have half-lives of about 30 years (half the radioactivity will decay in 30 years). Plutonium-239 has a half-life of 24,000 years. High-level wastes are hazardous because they produce fatal radiation doses during short periods of direct exposure.

The radioactive waste from nuclear plants is radioactive for 10,000 years and the correct option is option B.

The waste produced by a nuclear power plant or lab is referred to as radioactive waste. They include radioactive substances that are dangerous to the environment and the majority of biological forms. The wastes degrade over time.

Radioactive wastes are stored to-

Therefore, the radioactive waste from nuclear plants is radioactive for 10,000 years and the correct option is option B.

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Answer: Here goes ur answer

CO2

Explanation:

Answer:

Calcium

Explanation:

is a silver-gray metal which takes its name from the Latin word calx, which means lime. It is the fifth most abundant element in the earth's crust and is widely distributed as limestone (CaCO3), quicklime (CaO) and calcium fluoride.

Alkaline earth metals are present on the left of the periodic table. Therefore, calcium is the alkaline earth metal is the components of quick lime​.

Metals are those elements which is hard, conduct electricity, ductile, lustrous and malleable.

The properties of metals are:

1.Since metals have free electrons that's why they can conduct electricity

2. Since atoms in metals are very closely packed in a definite crystal so these are solid. It is not brittle that is it can not be broken down easily

3. It does not react with water easily.

4.It is denser than water hence it sink in water.

The formula for quick lime is quicklime (CaO). The alkaline earth metal that is component of quick lime is calcium Ca. Quick lime is used in white washing.

Therefore, calcium is the alkaline earth metal is the components of quick lime​.

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Answer: A when going down the periodic table your atomic radius will get bigger same if you got to the side. B Moving left to right within a period or upward within a group, the first ionization energy generally increases

Explanation:

Answer:

calcium hydroxide.............

The Alkaline earth metal present in the following materials like lime stone , slaked lime , quicklime and gypsum is Calcium and the Alkaline earth metal present in Epsom salt is Magnesium.

The alkaline earth metals are those elements that correspond to group 2 in the modern periodic table which includes beryllium, magnesium, calcium, strontium, barium, and radium. The elements in this group are quite similar in their physical and chemical properties.

For above information, Calcium is the [tex]20^t^h[/tex]element and Magnesium is the [tex]12^t^h[/tex] element in the periodic table.

Chemically, the given materials which are mentioned above is represented in following manner.

Limestone is Calcium Carbonate -[tex]CaCO_3[/tex]

Slaked Lime is Calcium Hydroxide - [tex]Ca(OH)_2[/tex]

Quicklime is Calcium Oxide - CaO

Gypsum is Calcium Sulfate Dihydrate - [tex]CaSO_4.2H_2O[/tex]

Epsom salt is Magnesium Sulfate - [tex]MgSO_4[/tex]

Thus, the Alkaline earth metal present in the following materials like lime stone , slaked lime , quicklime and gypsum is Calcium and the Alkaline earth metal present in Epsom salt is Magnesium.

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The above question is incomplete. Completed question is Which alkaline earth metal is the components of the following. Materials lime stone , slaked lime , quick lime , gypsum , Epsom salt.

Answer:

Joseph Black discovered carbon dioxide.

Explanation:

Answer:

In anaerobic respiration, glucose breaks down without oxygen. The chemical reaction transfers energy from glucose to the cell. Anaerobic respiration produces lactic acid, rather than carbon dioxide and water. Unfortunately this can lead to painful muscle cramps.

please mark my anSwEr as brainlist

Answer:

In anaerobic respiration, glucose breaks down without oxygen. The chemical reaction transfers energy from glucose to the cell. Anaerobic respiration produces lactic acid, rather than carbon dioxide and water. Unfortunately this can lead to painful muscle cramps.

Explanation: Living things need energy for everything they do, including growing and reproducing. This energy comes from glucose. All animals and humans get glucose through eating it, but plants need to make their own glucose during photosynthesis.

Plants and animals transport glucose and oxygen to tiny structures in their cells, called mitochondria. Here, the glucose and oxygen take part in a chemical reaction. The reaction is called aerobic respiration, and it produces energy which transfers to the cells.

Aerobic respiration makes two waste products:carbon dioxide and water. Animals remove carbon dioxide from their bodies when they breathe out. In daytime, plants use some of this carbon dioxide for photosynthesis. At night, they release the carbon dioxide to their surroundings.

Answer:

5

Explanation:

Sorry, don't have one

Hope this helps and I get brainliest <3

Answer:

40.06 amu.

Explanation:

From the question given above, the following data were obtained:

Isotope A (K-39)

Mass of A = 39 amu

Abundance of A = 23%

Isotope B (K-40)

Mass of B = 40 amu

Abundance of B = 48%

Isotope C (K-41)

Mass of C = 41 amu

Abundance of C = 100 – (23 + 48)

Abundance of C = 100 – 71

Abundance of C = 29%

Average mass =?

Average mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100]

= [(39 × 23)/100] + [(40 × 48)/100] + [(41 × 29)/100]

= 8.97 + 19.2 + 11.89

= 40.06 amu

Thus, the average mass of potassium is 40.06 amu

Answer:

Density = mass/volume

Density = 500 kg/0.185m3

Density = 2702.7 kg/m^3

Hope this helps!

Answer:

2702.7 kg/m3

Explanation:

d= 500kg / 0.185m3

d=2702.7 kg/m3

Answer:

81 x as bright

Explanation:

The intensity of light is dependent on distance according to this simple equation:

(90/10)^2 = 9^2

                = 81

This was derived from the inverse-square law. Respectively a light that is 10 m away from you is 81 x as bright.

Answer:

factor

Explanation:

Answer:

something pushes or pulls it to a stop.

Answer:

171°F is the answer of this question

Answer:

a. KCl

Explanation:

a. KCl - made of 2 elements

b. NH4Cl

c. KClO3

d. NH4ClO3

Answer:

Exothermic reaction

Explanation:

Exothermic reaction is a reaction in which energy is evolved from the reaction to the surroundings

Answer:

The bonds between nitrogen and oxygen are covalent bonds made from sharing electron pairs. The electronegativity of oxygen is 3.5.

Answer:

omg i love grass hopperszszszs

Explanation:

you should give it a mate

Answer:

8.25 g HNO3 (please correct me if I'm wrong!)

The correct answer is 7.31 g HNO₃.

Nitric acid is used for the production of ammonium nitrate, a major component of fertilizers. It is also used for producing explosives like nitroglycerin and trinitrotoluene (TNT) and for oxidizing metals.

Please check the attached file for an explanation.

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Answer:

1) A. NO

2) B. 4

3) D. 8

Explanation:

Answer: Habers process is the industrial process used for the production of ammonia

[tex]N_2(g)+3H_2(g)\rightarrow 2NH_3(g)[/tex]

Explanation:

Habers process is the industrial process used for the production of ammonia. It uses hydrogen from natural gas and nitrogen mainly from atmosphere under extremely high pressures (150-200atm) and moderately high temperatures [tex](400-450^0C)[/tex].

The catalyst used in Habers process is iron.

The balanced chemical reaction is:

[tex]N_2(g)+3H_2(g)\rightarrow 2NH_3(g)[/tex]

Answer:

natural flame,oxidising flame

Explanation:

[tex] \boxed{ \text{States \: of \: matter}}[/tex]

Matter exists in three physical states. They are :

✰ [tex] \underline{ \text{Characteristics \: of \: solid}} : [/tex]

[ Stones , bricks etc are some of the examples of solid ].

✰ [tex] \underline{ \text{Characteristics \: of \: liquid}} : [/tex]

[ Water , Ink , Milk , Cooking oil , petrol etc are some of the examples of Liquid ] .

✰ [tex] \underline{ \text{Characteristics \: of \: gas}} : [/tex]

[ Air , oxygen , carbon dioxide etc are some of the examples of gas ] .

Hope I helped ! ♡

Have a wonderful day / night ! ツ

# [tex] \underbrace{ \tt{Carry \: On \: Learning}}[/tex] ! ✎

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Answer:

eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

Explanation:

Answer:

7.71 ×10²⁴ atoms (3 s.f.)

Explanation:

Please see the attached picture for the full solution.

☆ or number of atoms, or fundamental units

(this is sometimes written as number of particles)

Further explanantion:

(☆:) Here, we are looking at the number molecules since H₂ is a molecule.

1 mole of a substance is the amount of substance which contains the same number of particles. Thus, when using Avogadro's Constant, the units that we are looking at follows the units of the question. Then, look at what the question is asking for and answer accordingly.

The 2nd picture shows an example of another molecule, H₂O.

Some other examples would be:

1 mole of Na (an atom) --- 6.022 ×10²³ atoms

1 mole of CO₂ (a molecule) --- 6.022 ×10²³ molecules

1 mole of Na+ --- 6.022 ×10²³ ions

Thus, if we look at the 2nd image again, we can say that 1 mole of H₂O contains 6.022 ×10²³ molecules since H₂O is a molecule. However, if the question is asking for the number of atoms, it is not right to say that there are 6.022 ×10²³ atoms. Instead, there are 1.2044 ×10²⁴ H atoms and 6.022 ×10²³ O atoms, giving us a total of 1.8066 ×10²⁴ atoms in 1 mole of H₂O.