help me pleaseee, if you do tyy :)

Answer:

14

Explanation:

Atomic mass = protons + neutrons

6 + 8 = 14

Answer:

Explanation:

2

Explanation:

When water changes state from liquid to gas, this is Evaporation. (C)

When you apply heat to liquid water it will convert into gas. This process is called evaporation.

Answer:

water is a compound and nitrogen is an element

Explanation:

water is a compound and also a molecule because it is a combination of two different element, while nitrogen is an atom or an element

Answer:  Water is a compound and nitrogen is an element.

Explanation:

Water = H20 = 2 Hydrogen atoms and 1 Oxygen atom

Nitrogen (N) element of Group 15 of the periodic table

Answer:

Ethanoic Acid

Explanation:

Answer:

1. 40 grams

2. 20 grams

Explanation:

every 10 years, divide by 2

year 0; 80

year 10; 40

year 0; 80

year 10; 40

year 20; 20

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Answer:

80 grams

Explanation:

Normality is one of the units of concentration and it is derived by dividing the gram or mole equivalent of the solute in a solution by the volume (in liters) of the solution.  

The equivalent weight of NaOH is derived by dividing the molecular weight of the compound by 1. Hence, the equivalent weight of NaOH in 1 normal solution is 40/1 = 40 g.

If 1 normal NaOH solution contains 40 g of NaOH in 1 liter of the solution, then a binormal (2 normal) solution of NaOH would contain;

   2 x 40 = 80 g of NaOH.

The integumentary system functions to retain body fluids, protect against disease, eliminate waste products, and regulate body temperature. Cell membrane performs the same function as the integumentary system. Therefore, option A is correct.

The cell membrane performs a function that is similar to the integumentary system. The cell membrane is a thin, flexible layer that surrounds the cell and acts as a barrier between the cell and its external environment.

It helps to regulate the movement of substances in and out of the cell, maintain the balance of fluids and electrolytes, and protect the cell from harmful substances.

The cell membrane can also play a role in temperature regulation, as it helps to maintain the proper internal environment of the cell.

Thus, option A is correct.

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Answer:

4k^2-4k+1

Explanation:

Plx give brainlyest

Answer:

D) CH2

Explanation:

The empirical formula of propene is CH₂ as it has chemical formula of C₃H₆ which on division of subscripts give empirical formula as CH₂.

Empirical formula of a compound is defined as the simplest whole number ratio of atoms which are present in a compound.It does not make any mention of the arrangement of atoms or the number of atoms. The empirical formula gives information about the ratio of number of atoms which are present in a compound.

Molecular formula is determined from the empirical formula by dividing the molar mass of a compound by the empirical formula mass. The resultant which should be a whole number or very close to the whole number , then the subscripts are multiplied by the whole number to get the molecular formula.

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Answer:

because the minerals in the rock can't be used until they are separated

Answer:it’s 12.8cm^2 and I saw that last anwser and he’s not wrong but yeah I had trouble figuring it out but it’s just force divided by area for both tires multiply that by 2

Explanation:

A bicycle weighs 780. pounds. If the pressure exerted by its tires on the ground is 30.5 pounds per square centimeter, the area of one of the two tires that's in contact with the road is 12.8cm².it’s just force divided by area for both tires multiply that by 2.

Pressure is defined as the force applied perpendicular to an object's surface per unit area over which that force is distributed. Gauge pressure is the pressure in relation to the surrounding atmosphere. Pressure is expressed using a variety of units.

Pressure is defined as force per unit area of surface; the SI unit of pressure is the pascal (Pa), which is defined as one newton per square metre (N/m2). An object's pressure is proportional to the force it exerts and inversely proportional to the area over which the force is exerted.

The physical force exerted on an object is defined as pressure. The force applied per unit area is perpendicular to the surface of the objects. F/A is the basic pressure formula (Force per unit area).

Thus, the area of one of the two tires that's in contact with the road is 12.8cm².

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Answer:

Ketchup is not a change, it is a sauce.

Explanation:

Answer:

There is no change in the tomatos structure its "state of matter" you could say is changed, but the actual chemical compoud is the same.

I am sorry I don't know, points are points though

Answer:

754

Explanation:

Answer:

Please provide answer options. :)

Answer:

yes

Explanation:

Answer:

It is the first one.

Explanation:

Because yeah.

Answer:

chickens

Explanation:

we are more related to chickens as for we dont fly such like bats. chickens genes are closer to us. we cant be able to be upside down as long as bats can and we dont have their really good r=hearing either.

Answer:

B. How much energy it takes to heat a substance

Explanation:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

The substances with higher value of specific heat capacity require more heat to raise the temperature by one degree as compared the substances having low value of specific heat capacity. For example,

The specific heat capacity of oil is 1.57 j/g. K and for water is 4.18 j/g.K. So, water take a time to increase its temperature by one degree by absorbing more heat while oil will heat up faster by absorbing less amount of heat.

Consider that both oil and water have same mass of 5g and change in temperature is 15 K. Thus amount of heat thy absorbed to raise the temperature is,

For oil:

Q = m.c. ΔT

Q = 5 g× 1.67 j/g K × 15 K

Q = 125.25 j

For water:

Q = m.c. ΔT

Q = 5 g× 4.18 j/g K × 15 K

Q = 313.5 j

we can observe that water require more heat which is 313.5 j to increase its temperature.

Answer: D. Exactly one reactant is a solid, and exactly one product is a gas.

Explanation: PLATO

In the given reaction, there is only one reactant in solid state, that is copper carbonate and one gaseous product carbon dioxide. Hence, option D is the correct statement.

Copper carbonate is an ionic compound formed by the combination of copper metal and carbonate group. Copper metal loses two electrons to the carbonate group. It is a white powder and sparingly soluble in water.

The states of reactants and products in a reaction is represented  in brackets with the chemical formula of each compound. The reaction in which all the reactants are in same phase is called homogeneous.

The given reaction is an example of heterogeneous replacement reaction. The reaction includes the combination of solid copper carbonate with aqueous  HCl giving copper chloride solution and carbon dioxide gas. Thus, option D is correct.

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Answer:

B. Energy Molecule

Explanation:

Adenosine triphosphate, or ATP, is the primary carrier of energy in cells. The water-mediated reaction known as hydrolysis releases energy from the chemical bonds in ATP to fuel cellular processes. Adenosine triphosphate (ATP), energy-carrying molecule found in the cells of all living things.

Answer:

B. Energy Molecule

Explanation:

It is used for storing and transferring energy in cells.

Answer:

Answer is A

Explanation:

this is because selective breeding means selecting plants or animals having desired characteristics and let them breed with each other to reproduce an offspring having desired characteristics from both parents.

Answer:

A

Explanation:

Answer:

Anything below 7.0 is acidic, and anything above 7.0 is alkaline, or basic. pH scale, ranging from 0 (very acidic) to 14 (very basic/alkaline) and listing the pH values of common substances.

Explanation:

PRESS THE CROWN

The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic.

Explanation:

Answer:

The second choice.

Explanation:

The products often have completely different properties than the reactants.

The first and third are wrong because matter is always preserved in a chemical reaction.

The last is not true.

Answer:

Metal atoms and non-metal atoms do different things when they ionise. Metal atoms lose the electron, or electrons, in their highest energy level and become positively charged ions. Non-metal atoms gain an electron, or electrons, to become negatively charged ions.

Explanation: