7. DNA is essential to living organisms because it O is a spiral helix can prevent disease O carries the genetic code O can break apart​

(19) The potential energy of the piano is 14700 J.

(20) The height of the cannon ball is 35.71 m.

This can be defined as the energy of a body due to its position in the gravitational field.

(19) To calculate the potential energy of the piano, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values intyo equation 1

(20) To calculate the heigth of the cannon ball we use the formula below.

From the question,

Given:

Substitute these values into equation 2

Hence, (19) The potential energy of the piano is 14700 J and (20) The height of the cannon ball is 35.71 m

Learn more about potential energy here: https://brainly.com/question/14427111

#SPJ1

Answer:

B) Lose electrons to form positive ions

Explanation:

Answer:

30 grams

Explanation:

I got 40 wrong so I picked 30

Answer:

30 grams

Explanation:

I did the ck12

Answer:

One mole of calcium is present in one mole of calcium carbonate

Explanation:

Because its formula is CaCO3

Ca contains 2+ charge and CO3 contains 2- charge

Answer:

Jupiter would have the strongest gravitational pull on a satellite.

Gravity is directly proportional to mass.

Jupiter is the most massive, so it will have a stronger gravitational pull.

Explanation:

Answer:

The answer is "Igneous".

Explanation:

Igneous rock (or magmatic rock) is one of the 3 main forms of stone, the other metamorphic and sedimentary, derived from Latin "ignis", which denotes flame, which is formed through magma or lava melting and reasserting.  

This hardening of liquid-solid rock shapes the inglorious rock. Its diabasic, peridotite, gabs, quartz, pegmatites, or peridotite are examples of intrusive igneous rocks. Exceptional ignorant stones burst mostly on the surface, cooling fast and forming small crystals.

Answer:

Answer: The mass of product left in the test tube will be less than the initial measured mass of the reactants.

Explanation: This is because one of the products of the reaction is a gas (hydrogen) and it escapes as the reaction happens in an open system.

This is the reaction,

Mg(s) + 2HCl(aq) --------> MgCl2(aq) + H2(g)

So, evidently, only MgCl2 is left in the reaction test tube together with unreacted reactants.

But, the hydrogen gas that escapes accounts for the lesser mass at the end of the reaction.

The mass in the test tube at the end of the reaction +

the mass of Hydrogen gas that escapes = the mass of reactants before the reaction; consolidating the law of conservation of mass.

Answer:

1) The number of the listed compounds that have ionic bonds between them are 5 compounds

2) Their formulas showing their charges within the compounds are;

NaCl ↔ Na⁺+Cl⁻

MgO ↔ Mg²⁺+O²⁻

K₂O ↔ 2K⁺+O²⁻

LiF ↔Li⁺+F⁻

CaO ↔ Ca⁺+O²⁻

3) The major reason they were selected is because they are compounds formed by the combination of a metal and a nonmetal

Explanation:

1) An ionic bond involves the transfer of an atoms valence to another atom, such that the ions formed by the ionic chemical bond will be oppositely charged

Therefore, metals, which are elements that mainly have a few electrons in their outermost shell, loses their valence electrons and become positively charged, while non metals, which require a few electrons to complete the stable octet electronic configuration, receive the electrons from the metallic atoms and become negatively charged

Therefore, the compounds formed between a metal and a nonmetal in the list are the the compounds containing ionic bonds, including

NaCl, MgO, K₂O, LiF, and CaO

Therefore, 5 compounds contain ionic bonds between them;

2) Their formulas are;

NaCl, MgO, K₂O, LiF, and CaO

3) The major reason that the chosen compounds contain ionic bonding between them is because they involve the combination of a metal and a nonmetal as follows;

a) NaCl → Na⁺ (metal ion) + Cl⁻(nonmetal ion)

b) MgO → Mg²⁺ (metal ion) + O²⁻(nonmetal ion)

c) K₂O → 2K⁺ (metal ion) + O²⁻(nonmetal ion)

d) LiF → Li⁺ (metal ion) + F⁻(nonmetal ion)

e) CaO → Ca⁺ (metal ion) + O²⁻(nonmetal ion)

The concentration in volume-volume percent of the solution is: 1.6 %

To solve this problem the formula and the procedure that we have to use is:

% v/v = v(solute)/v(solution) * 100

Where

Information about the problem:

Applying the concentration formula  we get:

% v/v = v(solute)/v(solution) * 100

% v/v = (4 ml/250 ml) * 100

% v/v = 0.016 *100

% v/v =1.6 %

In chemistry a solution is known as a homogeneous mixture of two or more components called:

Learn more about chemical solution at: brainly.com/question/13182946 and brainly.com/question/25326161

#SPJ4

Answer: element symbol: Eu.   Element Atomic Number: 63.  

Europium

Europium (Eu), chemical element, a rare-earth metal of the lanthanide series of the periodic table.

Hope this helps..... Stay safe and have a great weekend!!! :D

Answer:

Translation: Air resistance is a force that is caused by air. The force acts in the opposite direction to an object moving through the air.

Data are characteristics or information, usually numerical, that are collected through observation. In a more technical sense, data are a set of values of qualitative or quantitative variables about one or more persons or objects, while a datum (singular of data) is a single value of a single variable.

a physical phenomenon produced by the motion of electric charge, which results in attractive and repulsive forces between objects.

Answer:

Dispersion forces are manifested as instantaneous charge differences due to molecular interactions

Explanation:

No, neon normally does not form any compounds because neon has eight electrons in its outermost shell and is unreactive.

Neon belongs to the Group 18 of the periodic table.

The other elements(Helium, argon, krypton, radon, xenon) along with neon present in group 18 are known as noble gases.

All the elements of this group are unreactive and gases.

All these gases except Helium have 8 electrons in their outermost level, which is a stable electronic configuration.

As they have a stable electronic configuration, they don’t have any tendency to accept electrons from other elements or donate their electrons, which makes them unreactive.

Thus, neon normally does not form any compounds because neon has eight electrons in its outermost shell and is unreactive.

To know more about "noble gases", refer to the link given below:

https://brainly.com/question/11764545?referrer=searchResults

#SPJ4

The balanced equation :

8Al + 3Fe₃O₄→ 4Al₂O₃ + 9Fe

You just have to look for which element is in bold because the question is not clear

Equalization of chemical reaction equations can be done using variables. Steps in equalizing the reaction equation:

1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c etc.

2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index between reactant and product

3. Select the coefficient of the substance with the most complex chemical formula equal to 1

Reaction

Al + Fe₃O₄→ Al₂O₃ + Fe

give a coefficient

aAl + Fe₃O₄→ bAl₂O₃ + cFe

O, left=4, right=3b⇒3b=4⇒b=4/3

Al, left=a, right=2b⇒a=2b⇒a=2.4/3⇒a=8/3

Fe, left=3, right=c⇒c=3

The equation becomes :

8/3Al + Fe₃O₄→ 4/3Al₂O₃ + 3Fe x3

8Al + 3Fe₃O₄→ 4Al₂O₃ + 9Fe

Reduction potential is a measure of the ability of a substance to be reduced

Reduction potential (Eo) can simply be defined as as that tendency of a chemical species or a substance to be reduced by gaining an electron.

Generally, the reduction potential of any chemical species can be determined by subtracting the standard reduction potential for the reaction occurring at the anode from the standard reduction potential for the reaction occurring at the cathode.

So therefore, reduction potential is a measure of the ability of a substance to be reduced

Learn more about reduction potential:

https://brainly.com/question/2731940

#SPI1

Answer: c. a measure of the ability of the substance to be reduced

Explanation:

Answer:

ionic bonding occurs when unstable atoms donates one or more valence electrons to a unstable atom

Explanation:

Answer:

c

Explanation:

There are four boxes so each are 25%.

Red = 25%

Red and White = 50%

White = 25%

Answer:

A

Explanation:

By nature, a hybrid has one dominante allele and one recessive allele

Answer:

Me and my friends were going to do a science experiment. Jonny’s job was to make the HYPOTHESIS. He said the “ If we mix baking soda and vinegar together, the TEMPERATURE will go down.”

So then Molly mixed the baking soda and vinegar together and checked the TEMPERATURE. We all OBSERVED as the thermometer’s TEMPERATURE went down. “ your THEORY/ HYPOTHESIS was correct!” Exclaimed Molly.

Then the whole science GROUP let out with a cheer! And wrote the information down on their EXPERIMENTAL info chart. They took a microscope and looked at the mixture because they wanted to the the little PARTICLES in the mixture. Lily CONTROLED the microscope she zoomed in and out to see the particles.

Explanation:

i hope this helps:)

Answer:

Photo?

Explanation:

Answer:

Transition metals can have multiple oxidation states because of their electrons. The transition metals have several electrons with similar energies, so one or all of them can be removed, depending the circumstances. When they attach to other atoms, some of their electrons change energy levels.

Explanation:

Answer:

Plants, bacteria, and algae

Explanation: Plants are known to gather food from the sun, algae is a type of plant, and bacteria gather food from the sun while they are in the air.

Answer:

Solution - (a) Brine . Suspension - (c) sand and water, (g) chalk and water​ Colloid - (e) air,  (f) smoke , (d) soda , (b) milk

Explanation:

A solution is an homogeneous mixture of two or more compounds.

A suspension is a heterogeneous mixture of two or more compounds while a colloid is a homogeneous mixture of two or more compounds with suspended particles which do not settle.

So, under these definitions, the classifications are as follows-

Solution - (a) Brine .

Suspension - (c) sand and water, (g) chalk and water​

Colloid - (e) air,  (f) smoke , (d) soda , (b) milk

Answer:

are gases at room temperature

usually do not react with other elements

are in a group called the noble gases

are nonmetals

Explanation:

The elements in group 18 or group O are the inert elements. They have completely outermost shell and are not reactive. Every atom reacts with another in order to be like the noble gases.

It should be noted that group 17 elements are very reactive compared to the group O elements.