Based on the graph, describe what is happening between 4 and 6 seconds. The object is moving away from the start at a constant speed. The object is not moving. The object is returning to the start at a constant speed. The object is changing speed.

Answer:

weak acids have a pH of less than 2

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Answer:

C. Number of outer shell electrons.

Explanation:

Groups consist of the vertical columns of the periodic table, such as 1A, 2A, etc. (Not including transition metal groups) which depict the number of valence electrons, or the number of electrons in the atom's outer shell.

For example, Oxygen, which is in group 6A, contains 6 valence (outer shell) electrons.

Answer:

number of outer shell electrons.

Explanation:

Answer: In their bonded, solid states, molecules like salt don't conduct electricity. But when they're dissociated in a solution or through melting, they can carry a current. This is because electrons can't move freely through water (in the same way they do in a conductive wire), but ions can move freely

Explanation:

Answer:

Correct, because B it is reported to the nearest miligram

Explanation:

4.6 rounded up is 5

Answer:

The evidence goes against A. Expanding Earth and B. Contracting Earth

A chemical reaction has the equation 2NaCl(aq) + F₂ → 2NaF(s) + Cl₂ (g). The reaction type occur between NaCl and F₂ is Single displacement.

Hence, Option (B) is correct answer.

A chemical reaction is a process in which chemical bonds between atoms to break and reorganize, to form other new substances.

Now lets check all options one by one

Option (A): Double displacement

A double displacement is a chemical reaction in which elements are exchange between the two compounds.  In the given reaction F₂ is not a compound. so this reaction cannot occur

Hence, option (A) is incorrect.

Option (B): Single displacement

A Single displacement reaction is a chemical reaction in which one element replaces the another element in a compound.

In the given reaction F₂ element replaces with the element Na in a compound NaCl. So this reaction occur.

Hence, option (B) is correct.

Option (C): Synthesis

A synthesis reaction is a chemical reaction where two or more substances react to produce a new compound.

In the given reaction two products are formed NaF which is a compound and Cl₂ which is element. So this reaction cannot occur.

Hence, option (C) is incorrect.

Option (D): Decomposition

A decomposition reaction is a chemical reaction in which one reactant breaks down to form a two or more products.

In the given reaction two reactants are given NaCl and F₂. So this reaction cannot occur.

Hence, option (D) is incorrect.

Thus, from above conclusion we can say that The reaction occurs between NaCl and F₂ is single displacement reaction.

Hence, Option (B) is correct answer.

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Answer:

Ammonia is gas.

Explanation:

If not moistened, there will be no change in color of litmus paper. That is why littmus paper is being moistened before testing the pH of a gas.

Hope it helps.

Answer:

Fluorine will not give up electrons when forming a chemical bond because since it is so electronegative, it pulls electrons from other elements closer to it. Fluorine also has seven valence electrons and needs just one electron to fill its outer shell and gain stability.

Hope this helps. :)

The information regarding the element fluorine is explained below:

The following information should be considered:

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Answer:

We can seprate oil and water by the process of seprating funnel

Answer: Plasma

Explanation: Plasma is the state of matter where the substance is ionized and has no definite shape or volumen. The fact of being ionized makes the substance a good electrical conductor.

Matter generally exists in three physical states, namely solid, liquid and gaseous states. The three states mainly differ in the arrangement of particles and the force of attraction among the constituent particles. Here plasma is characterized by ionized particles. The correct option is C.

Plasma is a hot ionized gas which contains equal numbers of positively and negatively charged electrons. The characteristics of plasmas are significantly different from those of ordinary neutral gases so that it is considered as the fourth state of matter.

Since plasma are made up of electrically charged particles, they are strongly influenced by electric and magnetic fields while neutral gases are not. Like gases plasmas have no fixed shape or volume and are less dense than solids or liquids.

Plasma is a superheated matter, so hot that the electrons are ripped away from the atoms forming ionized gas. It comprises over 99% of the visible universe.

Thus the correct option is C.

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Answer:

60.7 mole

Explanation:

for every 4 moles of iron 3 moles of oxygen is used.

So, moles of oxygen = [tex]\frac{3 * 80.9}{4}[/tex] = 60.675

Answer: D.  It is the currently accepted atomic model.

Explanation:

It is the mordern atomic model, also known as the Electron Cloud Model. Indicating that the nucleus of an atom is surrounded by a cloud of electrons.

Answer:

Explanation:

d

Answer:

D. 1:1

Explanation:

For every 1 mole of chlorine (Cl₂), there is one mole of calcium chloride (CaCl₂).

So, the mole ratio of chlorine to calcium chloride is 1:1.

Hope this helps. :)

The mole ratio of chlorine to calcium chloride in the given chemical reaction is 1:1.

Stoichiometry of the reaction gives idea about the relative amount of moles of reactants and products present in the given chemical reaction.

Given chemical reaction is:

Ca + Cl₂ → CaCl₂

From the stoichiometry of the given reaction it is clear that,

1 mole of chlorine = reacts with 1 mole of calcium chloride

So, mole ratio = Chlorine / calcium chloride = 1:1

Hence required mole ratio is 1:1.

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Answer:

Four ways to test a copper penny are given below:-

Explanation:

Answer:

Nitrogen

Explanation:

Each arrow counts as one electron so in total you have 7 arrows = 7 electron. From periodic table, we know Nitrogen has 7 electrons so the element here is nitrogen.

Answer:

Nitrogen

Explanation:

1 arrow is 1 electron. In total you have 7 arrows which means you have 7 electron. Nitrogen has 7 electrons.

Answer:

[tex]= 3.75m {s}^{ - 1} \\ [/tex]

Explanation:

[tex]velocity = \frac{displacement}{time} \\ = \frac{15m}{4s} \\ = 3.75m {s}^{ - 1} [/tex]

Answer:

3

Explanation:

Answer:

Cl₂ > Br₂ > I₂

Explanation:

An oxidizing agent gains electron for itself by removing electrons from other reactants during a reaction. Oxidation is the loss of electrons. Chlorine can take electron from bromine and chlorine while bromine can take electron from iodine, therefore chlorine is a more oxidizing agent than bromine and iodine while bromine is a more oxidizing agent than iodine.

Oxidizing ability decreases down the group.

Therefore Cl₂ > Br₂ > I₂

Answer:

Option A, Tectonic plates above the currents move toward each other.

Option C, One plate will submerge beneath another plate.

Option D, A convergent boundary is formed at the site of the collision.

Explanation:

The convection currents are the ones responsible for the movement of the tectonic plates, thus shaping the Earth's appearance with their movement, as well with the structures created by the movement. If the convection currents move toward each other, than the tectonic plates are moving toward each other. That will cause collision between the continents, and convergent boundaries will be formed. If the collision is between two or more continental plates, than they will merge, and from the pressure mountain ranges will start to form, but if there an oceanic plate involved as well, than the oceanic plate will be subducting beneath the continental plate or plates.

Answer:

- Tectonic plates above the currents move toward each other;

- One plate will submerge beneath another plate;

- A convergent boundary is formed at the site of the collision;

The convection currents are the ones responsible for the movement of the tectonic plates, thus shaping the Earth's appearance with their movement, as well with the structures created by the movement. If the convection currents move toward each other, than the tectonic plates are moving toward each other. That will cause collision between the continents, and convergent boundaries will be formed. If the collision is between two or more continental plates, than they will merge, and from the pressure mountain ranges will start to form, but if there an oceanic plate involved as well, than the oceanic plate will be subducting beneath the continental plate or plates.

Answer:

A. Argon

Explanation:

Argon is a nonmetal. It is a noble gas with an atomic number of 18.

Based on the periodic table of chemical elements, the atom which is not a metal is the atom with an atomic number (number of protons) of 18.

Given the following data:

An chemical element can be defined as a pure substance which is made up of atoms that are having the same atomic number (number of protons) in its atomic nucleus.

This ultimately implies that, an atomic number is equal to the number of protons in the nucleus of an atom of a chemical element.

In Chemistry, the following chemical elements have this atomic number:

Note: Both group 1 and 2 chemical elements are metals.

However, an atom with an atomic number of 18 is in group 8 of the periodic table and as such isn't a metal but a noble gas.

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Answer : The correct option is, (C) 26.5 L

Explanation :

The combustion of ethylene is:

[tex]C_2H_4(g)+3O_2(g)\rightarrow 2CO_2(g)+2H_2O(g)[/tex]

First we have to calculate the number of moles of water vapor.

From the balanced chemical reaction, we conclude that:

As, 1 mole of [tex]C_2H_4[/tex] react to give 2 moles of [tex]H_2O[/tex]

So, 0.535 mole of [tex]C_2H_4[/tex] react to give [tex]2\times 0.535=1.07mol[/tex] moles of [tex]H_2O[/tex]

Now we have to calculate the volume of water vapor.

Using ideal gas equation:

[tex]PV=nRT\\\\V=\frac{nRT}{P}[/tex]

where,

P = pressure of gas = 100 kPa

V = volume of gas = ?

T = temperature of gas = [tex]25^oC=273+25=298K[/tex]

R = gas constant = 8.314 L.kPa/K.mol

n = number of moles of gas = 1.07 mol

Now put all the given values in the above formula, we get:

[tex]V=\frac{nRT}{P}[/tex]

[tex]V=\frac{1.07 mol\times 8.314 L.kPa/K.mol\times 298K}{100kPa}[/tex]

[tex]V=26.5L[/tex]

Therefore, the volume of water vapor is, 26.5 L.

Answer:

12%

Explanation:

Answer:

it is 90.0

Explanation:

Answer:

i think its false because heat is defined as the sum of kinetic enegry present in the molecules of substances.

Answer:

52. The alcohol USED => methanol, CH3OH

The carboxylic acid USED => propanoic acid, CH3CH2COOH.

53. The alcohol USED => Ethanol, CH2CH3OH

The carboxylic acid USED => Formic acid, HCOOH.

Explanation:

52. To obtain Methyl propanoate, CH3CH2COOCH3, we simply react propanoic, CH3CH2COOH and methanol, CH3OH together as shown below:

CH3CH2COOH + CH3OH —> CH3CH2COOCH3 + H2O

The alcohol used: methanol, CH3OH

The carboxylic acid used: propanoic acid, CH3CH2COOH.

53. To obtain Ethyl methanoate, HCOOCH2CH3, we simply react

Formic acid, HCOOH and ethanol, CH3CH2OH together as show below:

HCOOH + CH3CH2OH —> HCOOCH2CH3 + H2O

The alcohol USED => Ethanol, CH2CH3OH

The carboxylic acid USED => Formic acid, HCOOH.

Answer:

The lattice energy increases as cations get smaller, as shown by LiF and KF.

Explanation:

Lattice energy is the change in internal energy that accompanies the formation of one mole of the solid from its constituent gas phase ions at 0 K. In calculating the lattice energy, we assume an electrostatic model where the ions are regarded as point charges.

The size of the ions determines the magnitude of the lattice energy. If the anion is the same, then the magnitude of the lattice energy depends on the the size of the cation, the smaller the cation the greater the lattice energy.

Since Li^+ is smaller than K^+, it is expected that LiF will have a greater lattice energy than KF, hence the answer.

The statement about crystal lattice energy that is supported by the information in the table is A. The lattice energy increases as cations get smaller, as shown by LiF and KF.

It should be noted that lattice energy simply means the change in internal energy that occurs after the formation of one mole of the solid from its constituent gas phase ions.

The magnitude of the lattice energy is determined by the size of the ions. From the table, the lattice energy increases as cations get smaller, as shown by LiF and KF.

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Answer:

Solar elevation.

Ozone.

Cloud cover.

Ground surface reflectivity.

Altitude.

Aerosols and pollutants.

Direct and diffuse UV.

I'm not sure if this was what you were looking for, but if it helps please mark me as brainliest.

Answer:The mole, symbol mol, is the SI base unit of amount of substance. The quantity amount of substance is a measure of how many elem

Explanation:

Answer:

34.08 g

Explanation:

Take the atomic mass of N=14.0, H=1.0/

no. of moles=mmass/molar mass

no. of moles of N2 used = 28.02 / (14x2)

=1.0007mol

From the equation, the mole ratio of N2 : NH3 = 1: 2,

so one mole of N2 produces 2 moles of NH3.

Using this ratio, we can deduce that the no. of moles of NH3 = 1.0007x2

= 2.001428mol

mass = no. of moles x molar mass

Hence,

mass of NH3 produced = 2.001428 x (14+1x3)

= 34.03

≈C

Answer:

A. Pascals

Explanation:

A unit Pascal is an SI unit used for internal pressure.

Centimeters cubed is volume.

Liters is measurement.

Kelvin is temperature.

Answer: A. Pascals

Explanation: Founders Educere answer