hi help me pls i don't know this ​

Answer:

a: graphite.

Explanation:

According to the forces of attraction, graphite has  weak dispersion forces in between layers.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Answer:

1. B

2. C

Explanation: The law that the properties of the elements are periodic functions of their atomic numbers. And the second one is, most of the air we breathe is made of oxygen.

Answer:

New volume = 150 mL

Explanation:

Initial temperature, T₁ = 35°C

Initial volume, V₁ = 350 mL

We need to find the change in volume when the temperature drops to 15°C.

The relation between the temperature and the volume is given by Charle's law. Let new volume is V₂. It can be given by :

[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}\\\\V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{350\times 15}{35}\\\\V_2=150\ mL[/tex]

So, the new volume is 150 mL.

Answer:

About 7.89g/cm^3, I think.

Explanation:

Find the volume. Divide the mass by the volume.

There are three light bulbs shown in the diagram, additional component that are present in the circuit is one battery, two switches and two resistors

Circuit diagram is also known as electrical diagram or elementary diagram which is a graphical representation of electrical circuit.

In the given diagram, two resistance is present which are represented by the zig zag symbol. One battery is also present which is represent on the right right at the vertical part and two switches are present which are present on the top right side and one on the left side below bulb.

Hence, one battery, two switches, two resistors are present in the circuit.

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Answer:

one atom of iron and three atoms of chlorine.

Explanation:

I just took the test and made a 100 and im really good that this because it so easy.

The compound FeCl₃ is made of one atom of iron and three atoms of chlorine.

Let's consider the chemical formula for iron (III) chloride: FeCl₃.

Let's consider which of the following is true for iron (III) chloride.

The compound FeCl₃ is made of:

The compound FeCl₃ is made of one atom of iron and three atoms of chlorine.

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Answer: The forensic examination of substances involve a preliminary flame test.

Explanation:

The forensic chemical analysis of samples involves the flame testing which is one of the preliminary test. The materials are burned on a flame and the color of the flame is considered indicative of the elements present in the material.

The substances like Borax (sodium borate), Copper(II) sulfate, and boric acid burn with a characteristic green flame.

Answer:

Both are only physical changes

Answer:

24 electrons

Explanation:

In order to write the Chromium electron configuration we first need to know the number of electrons for the Cr atom (there are 24 electrons). Once we have the configuration for Cr, the ions are simple.

I hope this is correct!

Answer:

physical

Explanation:

no chemical reaction is happening

The trends in electron configuration in the periodic table can be explained in the given way.

The number of valence electrons:

Increases from left to right across a period.

Remains the same from the top to the bottom of a group.

Electrons are added into the outermost:

In Groups 1 and 2 (Alkali metals and Alkaline earth metals).

Electrons are added in the outermost:

In Groups 3 through 12 (Transition metals).

Electrons are added in the outermost:

In Groups 13 through 18 (Boron group through Noble gases).

Hence, the trends in electron configuration in the periodic table are discussed above.

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Answer:

radiant

Explanation:

Radiant Energy

This should do it.

O - Oxide

N - Nitride

Cl - Chloride

Br - Bromide

Sulfide - S^2-

Iodide - I^-

Phosphide - P^3-

Flouride - F^-

When you have a non-metal, it ends in -ide when you place it into a chemical bond. These are all diatomic molecules (apart from phosphorus) and as such you take the element name, remove the suffix, and add -ide. When converting back, look at the electronegativity levels on your periodic table in the upper right corner of each element. (if you don't have them, google "nyc regents chemistry reference table" and go to page 6 of the first result.) The first charge in that spot is what the charge will be.

Answer:

its A

Explanation:

Answer: pseudoscience

Explanation:

Edge 2020

Answer: pseudoscience

Explanation: It is an opinion that is subjective.

Answer:

[tex]\boxed {\boxed {\sf Ionic \ bond}}[/tex]

Explanation:

First, let's look at the Periodic Table.

We see that aluminum is a metal, while oxygen is a non-metal.

Now, let's recall three types of bonds

Since we have a metal (Al) and a non-metal (O), aluminum oxide must have an ionic bond.

Answer:

What kind of properties result in the substance changing into a new substance?

A) Liquid Properties

B) Physical Properties

C) Chemical Properties

D) Real Properties

Edit: I don't like that question, so here another one instead...

Which of the following statement is incorrect for a chemical reaction?

A) Heat may be given out but never absorbed.

B) Sound may be produced.

C) A color change may take place.

D) A gas may be evolved

Explanation:

Answer:

Which of the following matches the correct definition to an example?

A. Chemical Change: My foot changes color

B. Physical Change: My microwave exploded

C. Chemical Change: My dog ate my homework

D. Physical Change: My homework burned in a fire

Also can u pls mark me brainliest im new pls

A "cell" might be a better name for the torch battery. A "battery" is a collection of connected cells. Another example of an electric cell is a lemon with two strips of different metals (for instance, zinc & copper) inserted into it. The correct option is B.

A primary cell in a dry-cell battery is one that cannot be recycled. Each dry-cell battery has a cathode and an anode for operation. Remote controls, clocks, and calculators are a few examples of modern-day items that employ dry-cell batteries.

Alkaline and lithium batteries are the two most typical types found in flashlights. A "dry" cell used in a torch has a finite lifespan.

Thus the correct option is B.

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Answer:

c

Explanation:

Answer:

Boron and Carbon

Explanation:

They both are in Group 14 in the Periodic Table of Elements.

Answer:

A

Explanation:

Hopefully this helps.

Answer:

Many scientists view biofuels as inherently carbon-neutral: they assume the carbon dioxide (CO2) plants absorb from the air as they grow completely offsets, or “neutralizes,” the CO2 emitted when fuels made from plants burn.

Explanation:

put in your own words, happy to help

To solve such this we must know the concept of combustion reaction. Therefore, the missing word is neutral that is Biofuels are therefore described as being carbon neutral.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

When biofuels are burned they release the same amount of carbon dioxide as was removed from the atmosphere by the plant. Biofuels are therefore described as being carbon neutral. the products of combustion reaction are carbon dioxide and water.

Therefore, the missing word is neutral.

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Answer:

11.9 g S

General Formulas and Concepts:

Chem

Explanation:

Step 1: Define

2.23 × 10²³ atoms S

Step 2: Define conversions

Avogadro's Number

Molar Mass of S - 32.07 g/mol

Step 3: Dimensional Analysis

[tex]2.23 \cdot 10^{23} \ atoms \ S(\frac{1 \ mol \ S}{6.022 \cdot 10^{23} \ atoms \ S} )(\frac{32.07 \ g \ S}{1 \ mol \ S} )[/tex] = 11.8758 g S

Step 4: Check

We are given 3 sig figs. Follow sig fig rules.

11.8758 g S ≈ 11.9 g S

Answer:

molecular collisions that have very specific orientations

Explanation:

Based on the collision theory, a high frequency of effective collision is dependent on the molecular collisions that have very specific orientations.

Answer:

C. molecular collisions that have very specific orientations

Explanation:

Answer:

7.85 g/cm³

Explanation:

Density is Mass/Volume

The mass is 212 grams

The volume is 27 cm³ (3 x 3 x 3 = 27)

212/27 = 7.851851852

We can estimate this to 7.85 g/cm³

Density is simply defined as the mass of a substance per unit volume of substance. It is expressed mathematically as:

[tex]Density = \frac{Mass }{Volume }[/tex]

To solve the question given above, we'll begin by calculating the volume of the iron. This can be obtained as follow:

Dimension = 3.0 cm by 3.0 cm by 3.0 cm

Volume = 3 × 3 × 3

Thus, the volume of the iron is 27 cm³

Finally, we shall determine the density of the iron as follow:

Mass of iron = 212 g

Volume of iron = 27 cm³

[tex]Density = \frac{Mass}{Volume } \\\\Density = \frac{212}{27}[/tex]

Therefore, the density of the iron is 7.85 g/cm³

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Answer:

V = 16.81 L

Explanation:

Given data:

Number of moles = 0.75 mol

Temperature = standard = 273 K

Pressure = 1 atm

Volume of balloon = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will rearrange the formula.

V = nRT/P

V = 0.75 mol ×0.0821 atm.L/mol.K ×273 K / 1 atm

V = 16.81 atm.L/ 1 atm

V = 16.81 L

Answer:

True

Explanation:

Answer:

The noble gases(neon, helium, argon)

Explanation:

In the ground state, noble gas atom has a completely filled valence electron shell. Space makes up the majority of an atom.

The smallest unit of matter that may be split without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. Electric forces, which link electrons towards the nucleus of atoms, cause them to be drawn to any positive charge.

Space makes up the majority of an atom. The remainder is made up of a cloud of negatively charged electrons around a positively charged nucleus made up of protons and neutrons. Compared to electrons, that are the smallest charged particles in nature, the nucleus is tiny and dense. In the ground state, noble gas atom has a completely filled valence electron shell.

Therefore, in the ground state, noble gas atom has a completely filled valence electron shell.

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Answer:

I think the answer is c)

Explanation:

Answer:

it is D. Reactant

Explanation:

Answer:

D

Explanation:

A chemical reaction is a process in which one or more substances, also called reactants.

Answer:

Explanation:

Groundwater spread over the years