can someone help me with this question its confusing
ASAP

Answer:

heating point for water - 100°

The melting point (MP) of a substance is the temperature at which it melts. A solid's melting point is a physical characteristic that can be used to identify a substance. Here the correct option is B.

The melting point of a solid is the temperature at which it begins to liquefy. A substance's normal melting point is its melting point under atmospheric pressure. Ice often melts at 0 degrees Celsius.

A physical process called melting or fusing causes a substance to change its phase from a solid to a liquid. This happens when the solid's internal energy rises, usually as a result of heat or pressure being applied, which raises the substance's temperature to the melting point.

Thus the correct option is B.

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Answer:

group 2

Explanation:

because they are the only alkalines earth metals on the periodic table

Answer:

b

Explanation:

1. Structure of an atom:-

The basic structure of an atom includes a tiny, relatively massive nucleus, containing at least one proton and usually one or more neutrons.Outside of the nucleus are energy levels (also called shells), which contain one or more electrons.

Properties of an atom:-

The neutrons have the greatest mass and have no charge. The protons have slightly less mass than the neutrons and are positively charged. The electrons have almost no mass and are negatively charged. The chemical properties of the atom are determined by the number of protons, in fact, by number and arrangement of electrons.

2. Elements and their chemical symbols :-

1) Sodium - Na

2) Carbon - C

3) Magnesium - Mg

4) Aluminium - Al

5) Silicon - Si

6) Chlorine - Cl

7) Potassium - K

8) Calcium - Ca

9) Copper - Cu

10) Iron - Fe

3. ionic bond

Covalent bond

Metallic bond

4. pH scale used to specify the acidity or basicity of an aqueous solution. Acidic solutions are measured to have lower pH values than basic or alkaline solutions

5. There are four natural states of matter: Solids, liquids, gases and plasma.

6. Law of conservation of mass :

The 'law of conservation of mass' says that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. The mass of the products in a chemical reaction must equal the mass of the reactants.

Law of conservation of energy :-

According to the law of conservation of energy, energy can only be transformed from one form to another. It can neither be created nor destroyed. The total energy before and after the transformation always remains constant.

Answer: mass

Explanation:

Answer:  microbe Rickettsia prowazekii

Explanation:

Answer: analyze the question so that you can get a correct answer

Explanation:

Answer:

2.cohesion 3.adhesion 4. polar molecule 5. changing states 6. condensation 7.capilary action 8.adhesion 9. changing state 10. evaporation

Answer:

80

Explanation:

W know that, the atomic no of lead (Pb) is 82. The no of protons is equal to the atomic no.

No of protons = 82

It has a charge of +2. It means that its lacks 2 electrons. No of electrons is :

e = 82-2

e = 80

Hence, Pd will have 80 electrons now.

Answer:

subatomic particles are smaller then atoms

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 53.137 g

volume = 7.11 cm³

We have

[tex]density = \frac{53.137}{7.11} \\ = 7.473558368...[/tex]

We have the final answer as

Hope this helps you

Answer:

5

Explanation:

they are all significant All non-zero numbers ARE significant

Answer:

The Answer Is Quarks

Explanation:

Its mad up of Quarks

i hope this helps

pls make me brilliant or something

The particle that is labeled with a question mark (?) in the diagram is Quarks

Quarks are elementary particles and fundamental constituents of matter. They are considered the smallest known particles that make up protons and neutrons, which are the building blocks of atomic nuclei. Quarks are classified as fermions, which means they follow the rules of quantum mechanics and obey the Pauli exclusion principle.

There are six known types, or flavors, of quarks: up (u), down (d), charm (c), strange (s), top (t), and bottom (b). Each quark flavor has a unique set of properties, including mass, electric charge, and the way they interact with other particles through the strong nuclear force. The up and down quarks are the lightest and most common, while the top quark is the heaviest.

One notable property of quarks is that they possess a fractional electric charge. The up quark has a charge of +2/3 (e/3), while the down quark has a charge of -1/3 (-e/3), where "e" represents the elementary charge carried by an electron. Quarks are never found in isolation due to the confinement principle, which means they are always bound together in composite particles called hadrons.

Quarks interact through the strong nuclear force, which is mediated by particles called gluons. This force binds quarks together to form protons and neutrons, and also governs the interactions within atomic nuclei.

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Answer:

C.

Explanation:

Invasive species are the non-native species in a particular area, society or environment causing more havoc than good. Invasive species are introduced into the environment through many means which might be intentional and which might not.

One of the reason behind the presence of invasive species in Georgia is to augment the native specie present in Georgia at that time for instance, one of the invasive species mentioned in the question that is "kudzu" was introduced to the environment in Georgia as specie for controlling erosion.

Although some invasive species were introduced into Georgia by mistake, some invasive species were also introduce because of the need for new Specie in the environment.

Answer:

It's D

Explanation: i just took did it in USATESTPREP.

Answer:

2.05 atm

Explanation:

From ideal gas equation;

PV=nRT

Making P the subject of the formula;

P= nRT/V

Substituting values;

P= 1 × 0.0821 × 294/ 0.5

P= 48.27 atm

Real gas pressure;

(P + an^2/v^2) . (V - nb) = nRT

(P + 1.345 × 1^2/0.5^2) . (0.5 - 1 × 0.03219) = 1 × 0.0821 × 294

(P + 5.38) . (0.46781) = 24.1374

(P + 5.38) = 24.1374/0.46781

(P + 5.38) = 51.5966

P= 51.5966 - 5.38

P= 46.22 atm

Difference = Pideal - Preal

Difference = 48.27 - 46.22

Difference = 2.05 atm

Answer:

independent variable: a variable (often denoted by x ) whose variation does not depend on that of another.

dependent variable: a variable (often denoted by y ) whose value depends on that of another.

Explanation:

Answer:

For a material to be considered as building material, it should have required engineering properties suitable for construction works. These properties of building materials are responsible for its quality and capacity and helps to decide applications of these material. Such properties of building materials are categorized as follows. 1. Physical properties 2. Mechanical properties 3. Chemical properties 4. Electrical properties 5. Magnetic properties 6. Thermal properties

Explanation:

Answer:

₈₈Ra²²⁶  →   ₈₆Rn²²²  + ₂He⁴  + energy

Explanation:

Alpha beta and gamma radiations are the examples of ionizing radiations.

Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles having  two proton and two neutrons. It is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number less than 4  and atomic number less than 2 as compared to parent atom.

For example:

₈₈Ra²²⁶  →   ₈₆Rn²²²  + ₂He⁴  + energy

Properties of alpha radiation:

Alpha radiations can travel in a short distance.

These radiations can not penetrate into the skin or clothes.

These radiations can be harmful for the human if these are inhaled.

These radiations can be stopped by a piece of paper.

Another example:

₉₂U²³⁸   →   ₉₀Th²³⁴  + ₂He⁴  + energy

Answer:

a. [Ar] 4s2 3d7

Explanation:

Answer:

When cosmetics companies use chemicals to make their products, they could dump their waste into rivers and oceans, causing water pollution to occur. The wildlife that lives in these habitats will probably die from them, causing some species to die out and become extinct.

Explanation:

Also, greenhouse gases could be released into the atmosphere, which would cause global warming.

Answer:

See explanation

Explanation:

Oxide has a 2- charge.

Copper (I) Oxide = Cu2O

Copper (II) Oxide = CuO

The formula CuO can not be used to represent both copper I oxide and copper II oxide.

The formula of an ionic compound takes into account the oxidation state and valency of the the metal cation which is usually shown as a Roman numeral in the name of the compound.

For the compound copper I oxide, the correct representation of the compound is Cu2O. This shows that oxygen has a valency of 2 while copper has a valency of 1 in the compound.

The correct representation of copper II oxide is CuO. In the compound, both copper and oxygen have valency of 2.

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Answer:

They are all in Group 11.

Explanation:

Look at the periodic table!

The elements gold, silver, sodium, aluminum are all metals. Gold and silver is transition metals. Sodium is in s  block and  aluminum is a p block elements in periodic table.

Metals are electropositive elements able to conduct electricity and because of the presence of a pool of free electrons.

Metallic elements forms ionic bonds with non-metals. Gold and silver are transition metals or d-block elements. They are highly conducting and silver is a common component in electrical devises.

Aluminum is a p-block element it is in 13th group and sodium is a first group element and is called as an alkali metal. Hence, all the given elements are metals.

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Answer:

Explanation:

It remains the same!

Answer:

D

Explanation:

More protons in the nucleus pull the electrons in, making the atomic radius smaller. Therefore, the correct option is option D.

The atomic radius is determined by the nucleus's balance between the attracting force of positively charged protons and the repelling force of electrons.

The most crucial element in calculating the average atomic radius is not Option A. Although atomic mass typically increases with time, increasing nuclear charge has a greater impact on atomic size.

Over time, Option B has no discernible impact on atomic radius. Although the number of valence electrons changes over time, increasing nuclear charge has the biggest impact on atomic size. The valence shell is the outermost electron shell.

The gradual decrease in atomic radius is unaffected by Option C. The most frequent electron pairing occurs within orbitals of the same energy level, and it has little impact on atomic size over a period.

Therefore, the correct option is option D.

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Answer:

1.006 * 103

Explanation:

Add the number between 1 and 9 and add a decimal accordingly . so the answer is 1.006 multiplied by 10 raised to power 3

Answer:

Krypton (Kr)

Explanation:

Krypton's melting point is -157.36°c

Answer:

V = l * w * h

V = 150.00 mm x 1cm/10 mm x 10.00 cm x 0.95 m x 100 cm/1 m = 1.4 x 104 cm3 D = M/V

M = D * V = 19.3 g/cm^3 * 1.4 * 104 cm^3 = 2.7 x 10^5 g = 270000 grams

Answer: Wash your hand Througly

Explanation:The things you handle in a lab can be dangerous and seeing as though it is a common habit to touch your skin and your face the things handled can make you and others sick. Washing your hands after every science lab session is essential to lab and outside lab safety.

Answer:

transverse and longitudinal

Answer:

Its constructive and destructive

Explanation:

Explanation: