What is one difference between Group 2 and Group 15 of the Periodic Table of Elements?

answer

1.1 Carbon is the sixth element in the periodic table.

(IV A)

1.2 electric configuration: O⁸ (He²) 2s² 2p⁴ .

atomic number: 8

1.3 protons= 8 , electron = 7

1.4 oxygen has 6 valence electrons .

carbon has 4 valence electrons.

1.5 the answer is in the photo.

Answer:

Option D

Explanation:

The nucleus of an atom consists of both protons and neutrons

Answer:

d

Explanation:

the nucleus of an atom contains protons and neutrons.

Answer:

Independent: sizes of nails

Dependent: number of paper clips

Controlled: Battery, wire and type of nails

Explanation:

An independent variable is a variable which when changes does not the effect the results of the experiment. It does not depends upon the dependent variable.

A dependent variable is defined as a variable which is affected when the independent variable is changed by the researcher or the experimenter. It depends greatly upon the independent variable.

While a controlled variable is that variable whose value is not changed in an experiment. It contains all the constants.

In the context,

the independent variable are : sizes of nails

the dependent variables are : number of paper clips

the Controlled variables are: Battery, wire and type of nails

Answer:

so what is the question?

where is the question?

thank you for free points. GBU.

Answer:

Why science communication is important? In the world we live in, not only does pursuing science matter but communicating about it effectively is important as well. Communicating about science is crucial, whether we communicate about it online or face to face, communication about the scientific facts is vital for the scientific community. This is especially important now when many question scientific methods, research, and results. We are not only talking about communication about science between academics, scientists and corporations, but we are also talking about the gap between the scientific world and non-scientific community.

true

The given statement is true.

• The atomic model of Bohr was based on the model given by Rutherford as he clarified the location of electrons.

• Based on Bohr's model, the electrons only at the fixed distances from the nucleus orbit around it known as the energy levels.  

• The work of Bohr illustrates the significance of communication in science as it would not be possible without the contribution of other scientists.  

• The atomic model of Bohr was built upon the atomic models of other scientists, mainly Rutherford.  

Thus, the given statement is true.

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Answer:

oxygen as it has 6 valence electrons

Answer:

.0787 moles

Explanation:

I'm assuming you mean moles of gold present as the "amount."

This is a moles to moles calculation, so we set it up as such:

*Note that 15.5g Au is given to us, and 197 g / mol of Au is gold's molar mass.

15.5g Au * (1 mol Au / 197 g Au) = ?

We can evaluate the equation to get 15.5 / 197 to get .0787 moles of Au.

Answer:

B. the study of electricity in chemistry

Explanation:

Electrochemistry is the study of chemical processes that cause electrons to move. This movement of electrons is called electricity, which can be generated by movements of electrons from one element to another in a reaction known as an oxidation-reduction ("redox") reaction.

Answer:

B => Study of electricity in chemistry

Explanation:

Electrochemistry is the study of electricity associated with chemical oxidation-reduction reaction. It is divided into two distinct disciplines; electrolysis and Galvanic Process.

Electrolysis is a nonspontaneous process requiring an outside power source (typically a battery) to drive the chemical reactions. Applications include metal refining and generation of various gases (for collection) by chemical process.

Galvanic Process is a spontaneous chemical process generating electrical energy by taking advantage of the different properties of metals.  Applications include batteries for many devices such as flash lights (Leclanche dry cell), alkaline button batteries for hearing aids, automobile batteries (lead storage batteries), the H₂/O₂ Fuel Cell battery, etc.

In general,

Electrolysis => Uses electrical energy (batteries) to drive chemical reactions

or,

Galvanic Process => Using chemical reactions to generate electrical energy

Answer: Electrons

Explanation: The electrons are found outside the nucleus and orbit it.

Explanation:

Anions and cations have different atomic sizes than the neutral atoms.

When the bromine atom becomes an anion, it ______ in size.

Anions involves gaining extra electrons. This basically leads to increased repulsion between the electrons and thereby increasing the size. Anions are always larger than the neutral atoms.

This means the answer is A. Increase

When the strontium atom becomes a cation, it ______ in size.

Cations involves losing valence electrons. This basically leads to a decrease in electron shells and electron repulsion thereby reducing the size. Cations are always larger than the neutral atoms.

This means the answer is B. Decrease

Answer:

Carbon dioxide

Water

Glucose

Answer:

Answer: it's easy just think about it:

Explanation:

weight: the weight of an object is the force acting on the object due to gravity.

mass: Mass is the amount of matter or substance that makes up an object.

in total: The mass of an object is a measure of the object's inertial property, or the amount of matter it contains. The weight of an object is a measure of the force exerted on the object by gravity, or the force needed to support it.

Happy to help!

Feel free to ask any questions!

answer: mass is the amount of matter in a material(m)

and weight is a measure of how the force of gravity acts upon that mass(m*g)

The percentage composition of this compound : 40%Ca, 12%C and 48%O

Given

20.0 g of calcium,

6.0 g of carbon,

and 24.0 g of oxygen.

Required

The percentage composition

Solution

Total mass of compound :

=mass calcium + mass carbon + mass oxygen

=20 g + 6 g + 24 g

=50 g

Percentage composition :

[tex]\tt \dfrac{20}{50}\times 100\%=40\%[/tex]

[tex]\tt \dfrac{6}{50}\times 100\%=12\%[/tex]

[tex]\tt \dfrac{24}{50}\times 100\%=48\%[/tex]

Answer:

Vitamin A is important for normal vision, the immune system, and reproduction. Vitamin A also helps the heart, lungs, kidneys, and other organs work properly. There are two different types of vitamin A. The first type, preformed vitamin A, is found in meat, poultry, fish, and dairy products.

Answer:

Vitamin A helps form and maintain healthy teeth, skeletal and soft tissue, mucus membranes, and skin. It is also known as retinol because it produces the pigments in the retina of the eye. Vitamin A promotes good eyesight, especially in low light. It also has a role in healthy pregnancy and breastfeeding.

:-))

Answer:

Answer:

Acronym  Elements Symbols

He Hydrogen H

has Helium He

light Lithium Li

brain Beryllium Be

but Boron B

can Carbon C

not Nitrogen N

offer Oxygen O

full Fluorine Fl

nine Neon Ne

subjects Sodium Na

must Magnesium Mg

all Aluminium Al

silly Silicon Si

people Phosphorus P

stop Sulphur S

calling Chlorine Cl

a Argon Ar

pope Potassium K

christ Calcium Ca

Answer:

Explanation:

Element   Symbol   Atomic Mass   # of Atoms   Mass Percent

Lithium Li 6.941 2 12.626%

Oxygen O 15.9994 4 58.209%

Sulfur S 32.065 1 29.165%

Answer:

D. 4 Valence Electrons and 4 Energy shells

Explanation:

Hello!

In this case, since finding the number of valence electrons and energy shells require the determination of the electron configuration for the element, knowing that germanium has 32 electrons (atomic number), we have:

[tex]1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^{10},4p^2[/tex]

We can see that the outermost energy shell is 4 which storages 4 electrons (2 from 4s and 2 from 4p); therefore, we infer it has 4 valence electrons and 5 energy shells, so the answer is:

D. 4 Valence Electrons and 4 Energy shells.

Best regards!

Answer:

i have no clue

Explanation:

Answer:

??????????

Explanation:

Answer:

The organism has a nucleus

Explanation:

According to this question, a student makes a claim that an observed organism is not a Bacteria. Organisms have been classified into two major domains based on their nucleus. Eukaryotic organisms have a well-defined double membrane nucleus while prokaryotes do not.

The organism being observed in this question posseses a nucleus and many chloroplasts meaning that the organism is most likely an EUKARYOTE. The observations that backs the student claim is that the organism has a nucleus. Bacteria is an example of prokaryotic organisms with no nucleus in their cell.

Answer:

Heterozygous refers to having inherited different forms of a particular gene from each parent.

Explanation:

Answer:

[tex]\boxed {\boxed {\sf 592,826,303.6 \ moles \ of \ Ca }}[/tex]

Explanation:

To convert from moles to particles, we must Avogadro's Number.

[tex]6.022*10^{23}[/tex]

This number tells us the number of particles (atoms, ions, molecules, etc.) in 1 mole of a substance. In this case, it is the particles of calcium in 1 mole of calcium.

[tex]6.022*10^{23} \ particles \ Ca / mole \ Ca[/tex]

We can use Avogadro's Number as a ratio or fraction.

[tex]\frac{6.022 *10^{23} \ particles \ Ca}{1 \ mol \ Ca}[/tex]

Multiply this by the given number of particles (3.57*10³²).

[tex]3.57*10^{32} \ particles \ Ca*\frac{6.022 *10^{23} \ particles \ Ca}{1 \ mol \ Ca}[/tex]

Flip the fraction so the particles of calcium will cancel out.

[tex]3.57*10^{32} \ particles \ Ca*\frac{1 \ mol \ Ca}{6.022 *10^{23} \ particles \ Ca}[/tex]

[tex]3.57*10^{32} *\frac{1 \ mol \ Ca}{6.022 *10^{23} }[/tex]

[tex]\frac{3.57*10^{32} \ mol \ Ca}{6.022 *10^{23} }[/tex]

[tex]592826303.6 \ mol \ Ca[/tex]

There are 592,826,303.6 moles of calcium in 3.57*10³² particles of calcium.

Answer:

its metal because its metal

Given that,

Mass, m = 1 kg

Mass of the Earth, [tex]M=6\times 10^{24}\ kg[/tex]

Radius of Earth, r = 6378  km

To find,

The gravitational force.

Solution,

The formula for the gravitational force is given by :

[tex]F=\dfrac{GmM}{r^2}\\\\F=\dfrac{6.67\times 10^{-11}\times 1\times 6\times 10^{24}}{(6378 \times 10^3)^2}\\\\F=9.83\ N[/tex]

So, the required force is 9.83 N.

Answer:

This law states that the volume and temperature of a gas have a direct relationship: As temperature increases, volume increases, when pressure is held constant. Heating a gas increases the kinetic energy of the particles, causing the gas to expand.

Explanation:

Considering the Charles's law and STP conditions, the volume of the gas at standard temperature is 12.61 L.

Charles's law establishes the relationship between the volume and temperature of a gas sample at constant pressure.

This law says that for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases. That is, the volume is directly proportional to the temperature of the gas.

Mathematically, Charles's law states that the ratio between volume and temperature will always have the same value:

[tex]\frac{V}{T} =k[/tex]

Considering an initial state 1 and a final state 2, it is fulfilled:

[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C (or 273 K) are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

In this case, you know:

Replacing in the definition of Charles's law:

[tex]\frac{13.4 L}{290 K} =\frac{V2}{273 K}[/tex]

Solving:

[tex]V2= 273 K\frac{13.4 L}{290 K}[/tex]

V2= 12.61 L

Finally, the volume of the gas at standard temperature is 12.61 L.

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Charles's law:

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STP conditions:

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Answer:

1) contraction

2) 1.54 liters

3) 150°C

4) The gas expands proportionally to the increase in temperature

5) false

6) true

7)pentane

8) it has a boiling point around 35°

Explanation:

Answer:

b) 49.48% C, 5.19% H, 28.85% N, and 16.48% O

Explanation:

we find the mass for each element in one mole by multiplying the number of atoms in one molecule with the atomic mass

mC=8Ac=8*12=96g

mH=10AH=10*1=10g

mN=4AN=4*14=56g

mO=2AO=2*16=32g

by adding the masses together we find the molar mass of the molecule

M=mC+nH+mN+mO=96+10+56+32=194g/mole

we apply the rule of threes to find the percentage of each element

194g..96gC..10gH...56gN....32gO

100g....a...........b...........c.............d

a=(100*96)/194=49.48%C

b=(100*10)/194=5.19%H

c=(100*56)/194=28.85%N

d=(100*32)/194=16.48%O