i need help with these three

Answer:

The answer is

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume of copper = 14.75 cm³

Density = 8.96 g/cm³

The mass is

mass = 8.96 × 14.75

We have the final answer as

Hope this helps you

Answer:

yes

Explanation:

mmmm

Answer:

68 degrees fahrenheit

Explanation:

Answer: C- they alternately compress and pull apart the particles in matter

A -they ate the first waves detected after and earthquake

Explanation:

Answer:

A&C

Explanation:

APEEXX

Answer:

The percentage of salt in the mixture 24.84%

Explanation:

In this problem we are required to solve for the percentage of salt in the mixture of salt and water

Step one :

We can proceed by first solving for the total mass of the mixture

Which is given as

mass of mixture =mass of salt +mass of water

Mass of mixture = 1.17+3.54

Mass of mixture = 4.71 lb

Step two :

Now let us calculate the percentage of salt present in the mixture which is

=(mass of salt/mass of mixture) *100

=(1.17/4.71)*100

=0.248*100

=24.84%

Answer:

a :Chemical  b : compound

Explanation:

a : it had to be a chemical change because it says "There is no change in

the appearance of the solid, but the reactivity of the material changes.

b : well it would be a compound because it would have to be to make a reaction

There is no change is the appearance of the solid, but the reactivity of the material changes.  In case of question a :Chemical changes occur and in case of question   b : The original material is compound.

A compound is defined as the material that is composed up of two or more elements by chemically combined with each other in a fixed proportion by their mass.

Examples are Water, Sodium Chloride,  Ammonium Chloride etc; They have a fixed melting and  boiling points, a compound can be  changed in chemical reaction and hence the components are mixed in a fixed proportion.

Two primary types of compounds are covalent and ionic compounds as it is bonded  by covalent and ionic bond, the formation of covalent bond occur between two nonmetals, like water or methane. These molecules are neutral and weak.

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Answer:

1.34 cubic centimeter

Explanation:

v = m/d

Answer:

Boiling point: physical

Density: physical

Ductility: physical

Heat of combustion: chemical

Explanation:

Chemical properties can only be analyzed by putting the substance through a chemical reaction, such as combustion.

Physical properties can be analyzed without altering the substance chemically. With that in mind:

Boiling point is the physical property, density is the physical property, ductility is also a physical property but combustion of heat is a chemical property.

A physical property is the characteristic of a substance or compound that is observed without any change in the identity of the particular substance.

The physical properties of a substance is its colour, hardness, density, and melting as well as boiling points.

A physical property is a characteristic of matter that involves in physical change and physical changes are reversible and there is no production of any new substance.

The chemical change is the property of a substance due to which new substances are formed and it is non reversible change.

The chemical properties are flammability, toxicity, heat of combustion, coordination number, enthalpy of formation, and oxidation states.

Therefore, Boiling point is the physical property, density is the physical property, ductility is also a physical property but combustion of heat is a chemical property.

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(a). law (states a consistently observed phenomenon, can be used for prediction); (b). theory (a widely accepted explanation of the behavior of matter); (c). hypothesis (a tentative explanation, can be investigated by experimentation)

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Answer:

The subscript next to the letter "C" will always tell you the number of carbon atoms.

Answer:

Explanation:

Because it's in your hands and there so small that a  scientist would need a  full scan from the body

Answer:

The correct answer is 1.1 kg

Explanation:

From the data provided:

Weight (cup + water)= 2.58 kg

Weght (cup) = 1.50 kg

Thus, we simply calculate the difference between the full cup and the empty cup to obtain the net weight of water:

Weight (water) = Weight (cup + water) - Weght (cup)

                         = 2.58 kg - 1.50 kg

                         = 1.08 kg ≅ 1.1 kg

Answer: chemistry f sucks

Explanation:

bc it's f stupid

Answer:

im thinking  its 362x

Explanation:

Answer:

Option B.

Explanation:

Isotopy is a phenomenon where by two or more atoms have the same atomic number (proton) but different mass number due to the difference in neutron present in the atoms. The atoms that exhibit Isotopy are isotopes.

With the above information, we can obtain the right answer to the question given above as follow:

For option A:

Isotope >> atomic no >> Mass no

16 8X >>> 8 >>>>>>>>> 16

16 6X >>> 6 >>>>>>>>> 16

Since they have the different atomic number, they are not isotope.

For option B:

Isotope >> atomic no >> Mass no

16 8X >>> 8 >>>>>>>>> 16

17 8X >>> 8 >>>>>>>>> 17

Since they have the same atomic number but different mass number, they are isotope.

For option C:

Isotope >> atomic no >> Mass no

12 6X >>> 6 >>>>>>>>> 12

14 7X >>> 7 >>>>>>>>> 14

Since they have different atomic number, they are not isotope.

For option D:

Isotope >> atomic no >> Mass no

6 26X >> 26 >>>>>>>>> 6

26 6X >>> 6 >>>>>>>>> 26

Since they have different atomic number, they are not isotope.

From the above illustration, only option B contains isotopes because the atoms have the same atomic number but different mass number

Answer:

The correct answers are:

a) 180 g

b) 93.7 cm³

Explanation:

The density of a substance is the mass of the substance per unit of volume. So, it is calculated as follows:

density= mass/volume

From the data provided in the problem:

density = 0.8 g/cm³

a) Given: volume= 225 cm³

mass= density x volume = 0.8 g/cm³ x 225 cm³ = 180 g

b) Given: mass= 75.0 g

volume = mass/density = 75.0 g/(0.8 g/cm³)= 93.75 cm³≅ 93.7 cm³

Taking into account the definition of density:

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

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

From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

In this case, you know that:

Replacing in the definition of density:

[tex]0.8 \frac{g}{cm^{3} } =\frac{mass}{225 cm^{3} } [/tex]

Solving:

mass= 0.8 [tex]\frac{g}{cm^{3} } [/tex] ×225 cm³

mass= 180 g

In summary, the mass of 225 cm³ of ethanol is 180 g.

In this case, you know that:

Replacing in the definition of density:

[tex]0.8 \frac{g}{cm^{3} } =\frac{75 g}{volume} [/tex]

Solving:

0.8 [tex]\frac{g}{cm^{3} } [/tex] ×volume= 75 g

volume= 75 g÷ 0.8 [tex]\frac{g}{cm^{3} } [/tex]

volume= 93.75 cm³

Finally, the volume of 75.0 g of ethanol is 93.75 cm³.

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Answer:

The atom

Explanation:

amount of mass in a given volume

Amount of mass in a given volume perfect describes the meaning of density. Hence option C is correct.

Density is the term used to describe the relation between the mass of the body and their volume. Density is a property that can be used to identify substances. Each substance has a unique density.

Example: wood ball density is less as compared to metal ball because wood ball is less than metal ball.

It describes how much matter is packed into a certain volume.

D = M/V

M =Mass (gram); V = Volume (ml or cm3); D = Density (gram/cm3)

Amount of mass in a given volume perfect describes the meaning of density. Hence option C is correct.

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Answer:

200 meters

Explanation:

if u swim for each end 4 times, and its 50 meters long, 50 x 4 = 200 meters

Explanation:

hope this will help you

Answer:

B

Explanation:

Hellium is a gas...

Solids are particles that are packed together

liquids are particles that are together but conforme to their container

gas have space between them and conform to their holder

Answer:

.4543

Explanation:

Answer:

0.927 i just did it on edg. 2020

Explanation:

Answer:

the answer is 35mg and 58ml

Answer:

air that moves from high pressure to low pressure

Answer:

Atoms of same element can combine in more than one ratio to form two or more compounds. Atoms are the smallest unit of matter that can take part in a chemical reaction. The law of definite proportions states that a chemical compound always contains exactly the same proportion of elements by mass.

Explanation:

Hope this helps :)

Answer:

17

Explanation:

We are given the equation:

[tex]5(3x)- 7y^2[/tex]

and asked to solve when x=3 and y=2. Therefore, we must plug 3 in for x and 2 in for y.

[tex]5(3(3))-7(2)^2[/tex]

Solve according to PEMDAS: Parentheses, Exponents, Multiplication, Addition and Subtraction.

Solve the exponent first.

⇒ (2)²= 2*2=4

[tex]5(3(3))-7(4)[/tex]

Multiply 3 and 3.

⇒3*3=9

[tex]5(9)-7(4)[/tex]

Multiply 5 and 9.

⇒5*9=45

[tex]45-7(4)[/tex]

Multiply 7 and 4.

⇒ 7*4=28

[tex]45-28[/tex]

Subtract 28 from 45.

[tex]17[/tex]

5(3x)-7y² when evaluated for x=3 and y=2 is 17

Answer:

calcium=20

gold=79

copper=29

iron=26

Explanation: