The healing of a cut finger. Is it a physical or chemical change? Explain.

Answer:

Explanation:

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

From the question

Density = 3.20 g/mL

volume = 15.0 mL

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

That's

mass = 3.20 × 15

We have the final answer as

Hope this helps you

Answer:

The acid will be neutralized overtime

Explanation:

The presence of the pyrites leads to the leaching of large amounts of sulphuric acid, however the basic carbonates neutralizes the acid according to the reaction equation;

CaCO3 + H2SO4 ---> CaSO4 + CO2 + H2O.

This will prevent all the deleterious consequences associated with the leaching of the acid in the abandoned coal mine.

Answer:

B.  Na

Explanation:

To identify an atom, you simply need to look at the number of protons.  This atom has 11 protons.  On the periodic table, you can see that the element with 11 protons is sodium (Na).

Answer: crushing a can, boiling water, breaking a glass

Explanation:

Answer:

Answer would be that boiling points and melting points are similar because they both involve the change in a state of a material, but they are different because boiling point involves a change from a liquid to a gas and melting point involves a change from a solid to a liquid. Boiling and melting are phase changes that can happen to a substance however they differ in the process that happens.

Explanation:

Two physical properties of matter can be best compared as boiling points and melting points are similar because both involve the change in a state of matter. But they are different because melting point involves a change from a solid to a liquid and boiling point involves a change from a liquid to a gas.

A boiling point of a liquid can be described as the temperature at which the vapour pressure is equal to the atmospheric pressure of the liquid. The liquid is changed into a vapour at this temperature.

With the addition of heat, the liquid will change into vapour without any increase in temperature. The vapour pressure of the gas increases until it is equal to the pressure of the gas surrounding it. Bubbles are formed within the liquid and rise to the surface.

The melting point of a substance can be described as the temperature at which it transforms the state from solid to liquid. At the melting point, the solid phases and liquid phases exist in equilibrium. The melting point depends on pressure and is generally specified at a standard pressure such as 1 atmosphere.

Learn more about melting and boiling point, here:

https://brainly.com/question/25777663

#SPJ6

Your question is incomplete, but most probably complete question was,

Which statement best compares and contrasts two physical properties of matter?

A) Density and solubility are similar because they both involve water, but they are different because density involves dissolving a material and solubility involves floating or sinking a material. Density and solubility are similar because they both involve a material’s mass and volume, but they are different because density involves floating materials and solubility involves sinking materials.

B) Boiling points and melting points are similar because they both involve changing the heat of a material, but they are different because boiling point involves adding heat to a material and melting point involves removing heat from a material. Boiling points and melting points are similar because they both involve the change in a state of a material, but they are different because boiling point involves a change from a liquid to a gas and melting point involves a change from a solid to a liquid.

Answer:

5

Explanation:

you have two zeros that are sandwiched in between and one following a signifincant figure after the decimal.

Dimensional analysis is the unitary method that is used to determine the values by multiplication. The cost of the ice cream sandwiches for the barbecue is 367.5 $.

Dimensional analysis has been defined in maths, physics, and chemistry to solve the problem by multiplying the given numbers to determine the values of the other data. It uses the base quantities to estimate the derived values.

Given,

Number of people at barbecue = 175

Cost of ice cream sandwiches = $1.68 per dozen

The average number of sandwiches per person = 1.25

The cost to buy ice cream sandwiches for the barbecue is estimated by the dimensional analysis as:

12 ice cream sandwiches = $1.68

1.25 ice cream sandwiches = $2.1

If it costs $2.1 for each person then 175 people costs:

$2.1 × 175 = $367.5

Therefore, it will cost 367.5 $ for the barbecue.

Learn more about dimensional analysis, here:

https://brainly.com/question/13078117

#SPJ2

Answer:

I'm not sure but I think the answer is Cathodic protection.

Answer:

Im pretty sure the answers b

Explanation:

Because if its talking about overall tempature the it means ihas tension with high surface.

Answer: D. All of the above

Answer:

B. Alpha Particles

Explanation:

P: Have a Nice Day!

Answer:

he oxygen ion you have with 8 protons attracting 10 electrons is larger, ... As a result, the 3Al3+ ion will be smaller than the Si element, which has ... O<Al3+<Si<Al<O2-<Ag<Rb<Cs ... It is fairly easy to arrange the atoms according to atomic size. ... I would put it between Al and Ag .

Explanation:

the  Answer is C

Both the atomic mass and the atomic number increase from left to right.

Answer: is C

Explanation:

Both the atomic mass and the atomic number increase from left to right

Answer:

formed at earths surface

Explanation:

so easy

Answer:

3). Chemical potential energy

1). lower in charcoal than in coal.

Explanation:

Chemical potential energy is defined as the energy that can be absorbed or stored in a substance's chemical bonds. It can be released when there is a change in the number of particles of the substance.

As per the question, coal releases more heat than charcoal because 'the chemical potential energy of charcoal is lower than the coal' and hence, the latter would release more heat on burning i.e. the energy that was absorbed in the chemical bonds of the substance. Hence, option 3 and 1 are the correct answers.

Answer: because the very polar water molecules attract both the positively charged sodium ions and the negatively charged chloride ions.

Answer:

The total measurements of the oil is 3.45mL

Explanation:

Given

1.5 mL, 0.75 mL, and 1.2 mL.

Required

Determine the total

To get the total, we simply add the given volumes together.

[tex]Total = 1.5 mL+ 0.75 mL + 1.2 mL[/tex]

[tex]Total = 3.45mL[/tex]

Hence;

The total measurements of the oil is 3.45mL

Answer:

3.4x10 to the power of 5

Explanation:

Answer:

My answer to the question is 3.4×10^-5.

Answer: The density of the rock is 2g/mL. Hope this helped! :)

Explanation:

V= 3.0mL                                                               D=M/V

M= 6.0g

D=6.0g/3.0mL

D= 2.0g/mL

Probably because they think it is more accurate.

Hope it helps.

Answer:smashing an object into many pieces is a physical change

Explanation:

becauseee i’m not sure i’m getting points

Answer:

smashing an object into many pieces is a physical change

Explanation:

Answer:

Explanation:

6CO₂ + 6 H₂O ⇄ C₆H₁₂0₆ + 6O₂

This is the chemical equation given .

1. The equation shows a __Chemical equation_______the breaking and forming of chemical bonds that leads to a change in the composition of matter.

2. In the equation, CO₂ is a___reactant_____.

3. In the equation, C₆H₁₂0₆ is a ___product________.

4. In O₂, the type of bond that holds the two oxygen atoms together is a_nonpolar_covalent bond_________.

5. In H₂O, the type of bond that holds one of the hydrogen atoms to the oxygen atom is a__polar_hydrogen bond____.

6. The number of oxygen atoms on the left side of the equation is__equal to_________ the number of oxygen atoms on the right side.

Answer:

The dependent variable is the variable being tested and measured in an experiment, and is 'dependent' on the independent variable.

Answer:

variable   whose value depends on that of another Explanation:

Answer:

adding or removing protons

Explanation:

Elements are defined by the number of protons they have. If you add or subtract protons then that changes and makes a new element.

Answer:

by changing the number of protons in the nucleus

Answer:

(simple differences)Biodegradable substances are those that degrades or break down naturally...

Non-biodegradable substances are those that do not degrades easily...

Answer:

Biodegradable substances are those that degrades or break down naturally

Non-biodegradable substances are those that do not degrades easily

Answer:

A.  Peroxide breaking down into water and oxygen

Explanation:

Generally when it comes to changes, there are physical and chemical changes. In physical changes, there are no new substances been formed, however in chemical change new substances are formed.

A.  Peroxide breaking down into water and oxygen

This is a chemical change.

B . Bubbles forming when a pot of water is heated

This is a physical change

C. A pair of jeans soaked in water drying after hanging outside

This is a physical change

D . A block of ice decreasing in size due to a change in temperature

This is a physical change.

Only option A is different from the rest,hence this is the answer.

Answer:

Explanation:a

Scientific predictions are best described as consistent data that are presented in the form of if and then. It is a solution to the problem that may be identified. Thus, option a is correct.

Scientific prediction is a statement that describes the events of the future that are not always correct or incorrect. In scientific research, the experiment is conducted based on the hypothesis to draw conclusions and results that are expected.

The expected results are said to be scientific predictions when they are represented in the form of "if and then" before the analysis of the experimental method and its result are done. It is an account of the events that may possibly take place under specific conditions.

Therefore, option A. scientific prediction is an expected problem.

Learn more about scientific predictions, here:

https://brainly.com/question/20101086

#SPJ2

Answer:

Explanation:

There are 3 types of plastids :-

1) Chloroplasts:- The green plastids which contain chlorophyll pigments for photosynthesis.

2) Chromoplasts:-The coloured plastids for pigment synthesis and storage.

3) Leucoplasts:- The colourless plastids for monoterpene synthesis found in non- photosynthetic parts of the plants.

They are of three types:-  

a) Amyloplasts- stores starch.

b) Proteinoplasts-  stores proteins.

c) Elaioplasts- stores fats and oils.

Answer:

scientists benefit the society because they prove many theories, plus they are always finding new solutions to new things

Explanation:

Answer:

The scientist uses specialized training to help solve problems

faced by society.

Explanation:

A P E X

Answer:

8.3334%

Explanation:

You have two masses. To find the percent of sodium chloride in water by mass, you divide the mass of NaCl by water. First, make both units the same. Easiest is to convert kg into g. 1.5kg = 1500g

125g NaCl/1500g H2O = 0.0833333333 ==> 8.3334%