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Answer:

Molecules must collide in order to react. In order to effectively initiate a reaction, collisions must be sufficiently energetic ( kinetic energy ) to break chemical bonds; this energy is known as the activation energy.

Explanation:

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Answer:

When the Tower formed around 50 million years ago, it was one to two miles below the Earth's surface. The harder igneous rock of the Tower is more resistant to erosion, and the gray columns of Devils Tower began to stand out above the surrounding landscape.

Explanation:

Answer:

lose

Explanation:

its lose because if its positive, assume the electron is a person who has already eaten, theyre full and dont want more, therefore they would want to lose the weight, so its lose.

Answer:

The moons orbit around planets.

Mass is the force that holds people ans objects to earths surface.

Explanation:

Answer:

A, C, E, G

Explanation:

I think they are your answer

Can I have brainliest

Answer:

the second 1

Explanation:

Answer: the covalent atomic radius is half the internuclear distance in a molecule with two identical.

Explanation:

Answer:

I would say 3 but I not exactly sure

Answer:

The universe is composed of gases like nitrogen, oxygen, and made of atoms

Explanation:

I would combine all of these simple gases to create more complex components and life forms

Answer:

a. and d.

Explanation:

H₂O and CO are reactants in the following chemical equation which are water and carbon monoxide respectively.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Answer:

n California there are two plates - the Pacific Plate and the North American Plate. The Pacific Plate consists of most of the Pacific Ocean floor and the California Coast line. The North American Plate comprises most the North American Continent and parts of the Atlantic Ocean floor. The primary boundary between these two plates is the San Andreas Fault. The San Andreas Fault is more than 650 miles long and extends to depths of at least 10 miles. Many other smaller faults like the Hayward (Northern California) and the San Jacinto (Southern California) branch from and join the San Andreas Fault Zone.

The Pacific Plate grinds northwestward past the North American Plate at a rate of about two inches per year. Parts of the San Andreas Fault system adapt to this movement by constant "creep" resulting in many tiny shocks and a few moderate earth tremors. In other areas where creep is NOT constant, strain can build up for hundreds of years, producing great earthquakes when it finally releases.

Explanation:

Answer: yellow

When you mix solutions of lead (II) nitrate and potassium iodide. The precipitate is yellow in colour and the compound is lead (II) Iodide. Pb (NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq). Yes, it is a double displacement reaction.

Explanation:  The lead nitrate solution contains particles (ions) of lead, and the potassium iodide solution contains particles of iodide. When the solutions mix, the lead particles and iodide particles combine and create two new compounds, a yellow solid called lead iodide and a white solid called potassium nitrate. When a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube, the precipitation of a yellowish solid is observed. This yellowish solid is lead iodide. Potassium nitrate is formed along with lead iodide.  When lead nitrate is mix with potassium iodine, a precipitation reaction occurs and yellow precipitate of lead iodide is formed.

Answer:

2.499 mol HCl

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

1.505 × 10²⁴ atoms HCl (Hydrochloric acid)

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

[tex]1.505 \cdot 10^{24} \ atoms \ HCl(\frac{1 \ mol \ HCl}{6.022 \cdot 10^{23} \ atoms \ HCl} )[/tex] = 2.49917 mol HCl

Step 4: Check

We are given 4 sig figs. Follow sig fig rules and round.

2.49917 mol HCl ≈ 2.499 mol HCl

Answer:

The independent variable here is the types of soil

Explanation:

An independent variable is the variable that is not affected by the outcome of other variables in a given experiment. This variable is the variable that is intentionally altered/changed (directly or indirectly) by the researcher in order/expected to produce a result for the experiment. Thus, the independent variable here is the types of soil. This is because the soil was intentionally changed/varied by the researcher and it's expected to determine the heights of the bean plants grown.

Answer: Im not sure if you are doing this in your class.

Explanation:

So... for the element of MAGNESIUM, you already know that the atomic number tells you the number of electrons. That means there are 12 electrons in a magnesium atom. Looking at the picture, you can see there are two electrons in shell one, eight in shell two, and two more in shell three

Explanation:

Protons are the positively charged particles in an atom

Neutrons do not carry any charges

Electrons carry negative charges

 Particles     Charge         Actual Mass       Relative mass compared to proton

 Electrons        -ve             9.11 x 10⁻³¹kg                        [tex]\frac{1}{1840}[/tex]

 Protons           +ve             1.67 x 10⁻²⁷kg                        1

 Neutrons            0              1.68 x 10⁻²⁷kg                       1

Answer:

B

Explanation:

Answer:

C is the answer to the question

Answer:

C. Diffusion or simple diffusion

Explanation:

I took the test

Answer: the eukaryotic cell

Explanation: Animal cells are typical of the eukaryotic cell, enclosed by a plasma membrane and containing a membrane-bound nucleus and organelles. Unlike the eukaryotic cells of plants and fungi, animal cells do not have a cell wall.

There are two kinds of motion that earth possess, one is rotation and other is revolution. Therefore,  earth does not stay in one place throughout the year. The earth revolves and spins around the sun. The Earth is situated between Venus and Mars.

The motion of the earth around its axis is known as rotation. Revolution refers to the motion of the earth about the sun in a fixed route or orbit. The earth's axis, which is an invisible line, forms a 6612° angle with its planet's orbit.

No, the earth does not remain stationary throughout the year. The Earth revolves around the sun. The earth revolves and spins around the sun. The Earth is situated between Venus and Mars, therefore it is neither too hot nor too cold.

Therefore,  earth does not stay in one place throughout the year. The earth revolves and spins around the sun. The Earth is situated between Venus and Mars.

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Answer:

electrolytes yes it is

Explanation:

i'm built different

Answer:

Explanation:

Likewise, the rate of a chemical reaction is a measure of how much reactant is consumed, or how much product is produced, by the reaction in a given amount of time. The rate of reaction is the change in the amount of a reactant or product per unit time.

Answer:

New volume V2 = 92.7 Liter (Approx)

Explanation:

Given:

V1 = 106 l

T1 = 45 + 273.15 = 318.15 K

P1 = 740 mm

T2 = 20 + 273.15 = 293.15 K

P2 = 780 mm

Find:

New volume V2

Computation:

P1V1 / T1 = P2V2 / T2

(740)(106) / (318.15) = (780)(V2) / (293.15)

New volume V2 = 92.7 Liter (Approx)

The final volume will be  44.69 L

Initial volume V₁ = 106.0 L

Initial pressure P₁ = 740.0 mm of Hg

Initial temperature T₁ = 45.0⁰C

Final pressure P₂ = 780.0 mm of Hg

Final temperature T₂ = 20.0⁰C

It is required to calculate the final volume V₂

The ideal gas equation is formulated as:

PV = nRT.

In this equation, P refers to the pressure of the ideal gas, V is the volume of the ideal gas, n is the total amount of ideal gas that is measured in terms of moles, R is the universal gas constant, and T is the temperature.

Applying the ideal gas equation considering the gas inside the balloon to be ideal, to get the new volume.

So, from ideal gas law, we get,

[tex]\frac{PV}{T} = constant[/tex]

where P = pressure, V= Volume, T= temperature.

So,

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]

[tex]V_2 = \frac{P_1V_1T_2}{P_2T_1}[/tex]

On substituting the values;

[tex]V_2=\frac{106.0\times740.0\times20.0}{780.0\times45}[/tex]

V₂ = 44.69 L

Hence, The final volume will be  44.69 L

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Answer:c

Explanation:

A valley will be carved out due to erosion.

Answer:

it was c

Explanation:

1. Box A

2. Box B

Explanation:

Box A has the greatest mass. As mass is directly proportional to Work. ie. Work= Force * Distance and Force= mass* acceleration. So,

Work = Mass* Acceleration * Distance

Box B reaches the end first as according to newtons second law, acceleration is inversely proportional to mass.Since, box B has the less mass, it will have higher acceleration and cover more distance.(Distance is directlyproportionalto speed)

Answer:

Visible Light

Explanation:

Answer:

I believe that the answer is visible light

Answer: Colds are caused by viruses and are easy to treat. They are usually caused by germs too.

Explanation:

Answer:

Answer: Colds are caused by viruses and are easy to treat. They are usually caused by germs too.v

Explanation:

Answer:

-304.1

Explanation:

Just took it on Edge 2020

The enthalpy change for the target reaction is obtained as -304.1 kJ.

The Hess law of constant heat summation states that; the heat of reaction can be obtained as the sum of the heat of several reactions.

In this case, the enthalpy change for the target reaction can be identified as; -198.9 + 142.3 + (-247.5) = -304.1 kJ.

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Answer:

For some reason all of those look like they are true