help plz will mark brainliest xD

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:

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:

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:

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.

Learn more about

Charles's law:

https://brainly.com/question/4147359

STP conditions:

brainly.com/question/26364483

brainly.com/question/8846039

brainly.com/question/1186356

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Answer:

Avogadro's number or Avogadro's constant.

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: 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)

Answer:

The ions have a normal, repetitive structure called an ion lattice. The lattice is formed when the ions attract each other and form a regular sequence of oppositely charged ions next to each other. ... This is why solid ion compounds form crystals with normal shapes.

How are ion crystals formed?

Ions bound together by electrostatic attraction form ion crystals. ... The plain cubic crystal lattice has ions that are evenly distributed in 3D at 90° angles. The stability of ion solids relies on the lattice energy that is emitted in the form of heat as two ions are brought together to form a solid.

Explanation:

Ion crystals are made up of ions that are electrostatically attracted to one another. Ions in the simple cubic crystal lattice are uniformly dispersed in three dimensions at 90° angles. Ion solids are dependent on the lattice energy, which is released as heat when two ions are brought together to form a solid.

Ionic bonds, also known as electrovalent bonds, are a type of connection created in a chemical molecule by the electrostatic attraction of ions with opposing charges. One atom's valence (outermost) electrons are permanently transferred to another atom to create this type of connection.

Ions (cations) are negatively charged when an atom obtains electrons whereas ions (cations) are positively charged when an atom loses electrons (anion). The compounds created between nonmetals and the alkali and alkaline-earth metals are the greatest examples of ionic, or electrovalent, compounds, which are the outcome of ionic bonding.

The electrostatic forces of attraction between opposing charges and repulsion between comparable charges arrange the ions in these types of ionic crystalline solids so that every positive ion is surrounded by a negative ion, and the converse is true. In other words, because of the way the ions are structured, the positive and negative charges alternate and balance one another, leaving the substance overall with no charge. In ionic crystals, electrostatic forces have a considerable magnitude. These chemicals thus tend to be solid and nonvolatile.

Therefore, ion crystals are made up of electrostatically attracted ions. Ions are uniformly distributed in 3D at 90° angles in the simple cubic crystal lattice. Ion solids rely on the lattice energy that is released as heat when two ions are brought together to form a solid for their stability.

Read more about ionic compounds, here

https://brainly.com/question/9167977

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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:

oxygen as it has 6 valence electrons

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:

6. 350kg

7. 800kg

8.600 meters

Explanation: I don’t like Stealing point but this is what I think I should give you and I don’t know how your teacher learn you this...

Answer:

6 is 350kg

7 is 800kg

8 is 600 meters

Explanation:

Thanks btw

Answer:

i have no clue

Explanation:

Answer:

??????????

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

Answer: Electrons

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

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:

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

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:

.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:

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:

its metal because its metal

Answer:

V₂  = 1866.32 mL

Explanation:

Given data:

Initial temperature = 27.8°C (27 + 273.15 K = 300.15 k)

Initial volume = 1500 mL

Final volume = ?

Final temperature = 100.0°C (100.0 + 273.15 K = 373.15 K)

Solution:

The given problem will be solve through the Charles Law.

According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

Now we will put the values in formula.

1500 mL / 300.15 k = V₂ / 373.15 K

V₂  = 1500 mL× 373.15 K/ 300.15 k

V₂  = 560175 mL. K /300.15 k

V₂  = 1866.32 mL

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.