PLEASE MY TEACHER DIDNT TEACH ME THIS PLEASE

Answer:

enr are those resources which are present in limited quality and can be use completely used up by human activities are called enr .example coal petrol

Answer:

Manipulated (independent) Variable and Responding (Dependent) Variable

Answer:

the electron is outermost

Explanation:

shell of a flourine are closer together .

Answer:

The electron gain enthalpy of chlorine is more negative than fluorine. This is because fluorine is smaller in size than chlorine. Thus the extent of electron-electron repulsion would be more in fluorine than in chlorine. Because of this, the incoming electron would face more repulsion in fluorine than in chlorine.

Explanation:

Answer:

Explanation:

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

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

Making mass the subject we have

From the question

Density of silver = 10.50 g/cm³

Volume = 105 cm³

Substitute the values into the above formula and solve for the mass

That's

mass = 10.5 × 105

We have the final answer as

mass = 1102.50 g

Hope this helps you

Answer:

Heat Energy... I am pretty sure?

Explanation:

There is a law called conservation of energy which states that energy can neither be created nor be destroyed. It can be only transferred from one form to another form. Therefore, heat energy  is released when we burn natural gas.

Energy transfer is a phenomenon in which energy transfer from one matter to another matter. Energy can be transferred in two forms that are by doing work or by transferring heat.

Heat can be transferred by three ways conduction, convention and radiation. In conduction, when two object are in direct contact, transfer of molecules takes place. Convection is the flow of heat from one layer of liquid to another layer. Heat energy  is released when we burn natural gas. This reaction is called combustion reaction.

Therefore, heat energy  is released when we burn natural gas.

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a = d/(b + c)

a(b + c) = d

a = d/(b + c)

Answer:

[tex]\huge \boxed{a= \frac{d}{b+c} }[/tex]

[tex]\rule[225]{225}{2}[/tex]

Explanation:

[tex]a(b+c)=d[/tex]

Dividing both sides by (b + c).

[tex]\displaystyle a= \frac{d}{(b+c)}[/tex]

[tex]\rule[225]{225}{2}[/tex]

Answer:

There are 1.253*10²⁴ particles in 2.080 moles

Explanation:

Avogadro's number is called the number of particles that make up a substance (usually atoms or molecules) that can be found in the amount of one mole. In other words, Avogadro's number is the number of molecules that one mole of any substance contains.  Its value is 6.023 * 10²³ particles per mole.

So, you can apply a rule of three as follows: if 1 mole has 6.023*10²³ particles, then 2.080 moles, how many particles does it have?

[tex]amount of particles=\frac{2.080 moles*6.023*10^{23}particles }{1 mole}[/tex]

amount of particles= 1.253*10²⁴ particles

There are 1.253*10²⁴ particles in 2.080 moles

Answer:

In a conventional optical microscope, objects less than about 200 nanometers apart cannot be distinguished from one another. ... Although electron microscopes produce a detailed image of very small structures, they cannot provide an image of the proteins that make up those structures.

Answer:

b. transmission electron microscope

Explanation:

Answer:

Explanation:

Density of a substance can be found by using the formula

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

From the question

mass = 32g

To find the density we must first find the volume of the block

From the question the block is a cuboid

Volume of cuboid = length × width × height

length = 8 cm

width = 4 cm

height = 2 cm

Volume of block = 8 × 4 × 2 = 64 cm³

Substitute the values into the above formula and solve for the density

That's....

[tex]Density = \frac{32}{64} \\ = \frac{1}{2} [/tex]

We have the final answer as

Density = 0.5 g/cm³

The block will float because it's density is less than the density of water which is

1 g/cm³

Hope this helps you

Answer:

d= 0.5 g/ cm³

The block will float in water.

Explanation:

The density of an object can be found using the following formula:

[tex]d=\frac{m}{v}[/tex]

where [tex]m[/tex] is the mass and [tex]v[/tex] is the volume. We know the block has a mass of 32 grams. We don't know the volume, therefore we must calculate it.

Let's assume the block is a cube. The volume of a cube can be found using the following formula.

[tex]v=l*w*h[/tex]

The length is 8 cm, the width is 4 cm and the height is 2 cm.

[tex]l= 8 cm \\w= 4cm \\h= 2cm[/tex]

[tex]v= 8 cm * 4 cm * 2cm[/tex]

[tex]v=32 cm^2 * 2cm[/tex]

[tex]v= 64 cm^3[/tex]

Now we know the volume and can substitute it into the formula, along with the mass.

[tex]d=\frac{m}{v}[/tex]

[tex]m= 32 g\\v= 64 cm^3[/tex]

[tex]d=\frac{32 g}{64 cm^3}[/tex]

Divide 32 grams by 64 cubic centimeters.

[tex]d= 0.5 g/cm^3[/tex]

The density of the block is 0.5 grams per cubic centimeter. The density of water is 1.0 g/cm³. Any object with a density that is less than 1 will float in water. 0.5 is less than 1, so this object will float in water.

Answer:

speed is a scalar quantity and velocity is a vector quantity.

Speed is distance/time and velocity is displacement/time

Answer:

Velocity is vector and speed is scalar

Explanation:

Answer:

D

Explanation:

A new substance must form in a chemical change. structure, properties and composition must change in a chemical change.

The creation of a new, solid substance from two liquid substances indicates that a reaction has taken place and altered the original substances.

Reaction is defined as a process in which one or more substances are also called as reactant, are convert to one or more different substance known as product.

There are basically five types of reaction

A new reaction must have chemical change as well as physical change such as structure, properties and composition.

Thus, the creation of a new, solid substance from two liquid substances indicates that a reaction has taken place and altered the original substances.

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Answer:

The answers to your questions are given below

Explanation:

1. KClO3 => Potassium trioxochlorate (V)

Thermal decomposition of KClO3.

When we heat potassium trioxochlorate (V), KClO3, it will slip into two producing potassium chloride, KCl and oxygen gas, O2 as shown below:

2KClO3(s) —> 2KCl(s) + 3O2(g)

Note: the above reaction will occur faster and at a lower temperature in the presence of manganese (iv) oxide as catalyst.

2a. Determination of the number protons and neutrons in Nitrogen–14.

Nitrogen–14 has the following:

Mass number = 14

Atomic number = 7

Proton =?

Neutron =?

Atomic number of an atom is simply the proton number. Therefore,

Proton = Atomic number

Atomic number = 7

Proton = Atomic number = 7

Proton = 7

Mass number = Proton + Neutron

Mass number = 14

Proton = 7

Neutron =?

14 = 7 + Neutron

Collect like terms

Neutron = 14 – 7

Neutron = 7

Therefore, Nitrogen–14 has 7 protons and 7 neutrons.

2b. Determination of the number protons and neutrons in Nitrogen–15.

Nitrogen–15 has the following:

Mass number = 15

Atomic number = 7

Proton =?

Neutron =?

Atomic number of an atom is simply the proton number. Therefore,

Proton = Atomic number

Atomic number = 7

Proton = Atomic number = 7

Proton = 7

Mass number = Proton + Neutron

Mass number = 15

Proton = 7

Neutron =?

15 = 7 + Neutron

Collect like terms

Neutron = 15 – 7

Neutron = 8

Therefore, Nitrogen–15 has 7 protons and 8 neutrons.

Answer:

We have the wavelength which is 10,speed/velocity=340 and frequency=?.

The formula is velocity=frequency × wavelength.

340=f × 10.

340=10f.

frequency=34hertz.

Answer:

34hertz

Explanation:

We have the wavelength which is 10,speed/velocity=340 and frequency=?.

The formula is velocity=frequency × wavelength.

340=f × 10.

340=10f.

frequency=34hertz.

Answer:

Explanation:

The density of a substance is given by

From the question

The mass of the stone is 211 g

It's volume is 72 cm³

Substitute the values into the above formula and solve for the density

That's

Density = 2.930

We have the final answer as

Hope this helps you

Answer: DILUTE SATURATED

Explanation:

Answer:

b. saturated

Explanation:

(:

Answer:

Exposure to oxygen (especially when combined with sunlight) alters the molecular structure of lignin, causing a change in how the compound absorbs and reflects light, resulting in the substance containing oxidized lignin turning a yellow-brown color in the human visual spectrum.

Answer:

The essence including its particular subject is outlined in the following portion mostly on clarification.

Explanation:

and,

chemical energy ⇒ heat energy + light energy + sound energy

Answer:

HOCH₂CH₂OH

Explanation:

You generally assume that polar dissolves polar and nonpolar dissolves nonpolar.  Since water is polar, we are looking for a polar molecular.  

This cancels out CH₃(CH₂)₉CH and CCl₄.

You are left with CHCl₃, CH₃(CH₂)₈CH₂OH, and HOCH₂CH₂OH.  You would pick the third option since it is the most polar.

The compound HOCH2CH2OH having two O - H groups is more likely to interact with water.

A substance is soluble in water if it is capable of interacting in an electrostatic interaction. Water can form hydrogen bonds with other molecules that posses polar O - H bonds.

Hence, looking at the options provided in the question, we will observe that the compound HOCH2CH2OH having two O - H groups is more likely to interact with water.

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Answer:

A. Modern atomic theory is, of course, a little more involved than Dalton's theory but the essence of Dalton's theory remains valid. ... Also, there are different kinds of atoms (differing by their masses) within an element that are known as "isotopes", but isotopes of an element have the same chemical properties.

B. The explanation becomes a scientific theory. In everyday language a theory means a hunch or speculation. Not so in science. In science, the word theory refers to a comprehensive explanation of an important feature of nature supported by facts gathered over time.

Answer:

4 mile : 253440 inches

0.004 grams : 1.814 grams

56 miles/hour : 82.133 feet per second

4.5 ml : 0.45 centilitre

34.g/ml : 74.9571691 lb/liter

30 lb: 480 ounces

Answer:

[tex]6.378*10^{6}m[/tex]

Explanation:

we have zeroes so that can be

[tex]6378*10^{3} m[/tex]

and we can continue moving the decimal point three more times

[tex]6.378*10^{6}m[/tex]

Answer:

•the maintenance of a stable internal environment

Hope this helps :)

Answer:

0.56kg=?mg

0.56kg x (1000 g/1kg) X (1000mg/1g) = 560,000mg

Explanation:

You got it right. Great Job!

Answer:

D. Oxygen

Explanation:

External factors of photosynthesis

Immediate product

Byproduct

Hope this helps ;) ❤❤❤

Answer:

34

Explanation:

Answer:

3500 Ml

Explanation:

1 liter is equal to 1000 milliliters

3.5 liters is equal to 3500 milliliter

Answer:

2.01% to the nearest hundredth.

Explanation:

Percent error =[ (8.96-8.78) / 8.96]* 100

= 0.020089 * 100

= 2.0089 %

The Percent error is 2.01% to the nearest hundredth.

Suppose the actual value and the estimated values after the measurement are obtained. Then we have:

Error = Actual value - Estimated value

To calculate percent error, we will measure how much percent of actual value, the error is, in the estimated value.

[tex]\rm Percent \: Error = |\dfrac{Error}{Actual value}|\times 100 \\\\[/tex]

[tex]Percent \: Error = | \dfrac{\text{(Actual Value - Estimated Value)}}{Actual value}|\times 100 \\[/tex]

(here |x| is such that it makes x non negative, thus, |-5| = 5, and |5| = 5)

WE have been given a cube of pure copper when you calculate the density using your measurements, you get 8.78 grams/cm3. Copper's accepted density is 8.96 g/cm3.

Percent error =[ (8.96-8.78) / 8.96]* 100

= 0.020089 * 100

= 2.0089 %

Hence, the Percent error is 2.0089 %.

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Answer:

Put these atoms in order from most negative overall charge to least negative

overall charge.

11 Atom X: 104 protons, 102 electrons

11 Atom B: 24 protons, 18 electrons

1 Atom Q: 15 protons, 16 electrons

11. Atom P: 7 protons, 10 electrons

Explanation:

What period is the atom in?

1.

What group is the atom in?

What is the name of this atom?

What other atom would have similar

properties to the atom?

Will this atom conduct electricity well