which of these characteristics of all animal cells ? check all that apply
they contain a nucleus .
they are eukaryotic.
they lack member-bond organelles.
they lack in nucleus.
they are prokaryotic.
they contain member-bond organelles.

Explanation:

Polyatomic ions are ions which consist of more than one atom. For example, nitrate ion, NO3-, contains one nitrogen atom and three oxygen atoms. The atoms in a polyatomic ion are usually covalently bonded to one another, and therefore stay together as a single, charged unit.

The chemical compound's empirical formula is NS.

The chemical compound's molecular formula is N4S4.

learn more about empirical formula here

https://brainly.com/question/1603500

#SPJ4

the question you are looking for is

A compound containing only sulfur and nitrogen is 69.6% S by mass; the molar mass is 184 g/mol. What are the empirical and molecular formulas of the compound?

Answer:

A. ocean winds can carry moisture with them and can bring rain and fog over inland areas

Explanation:

It's "A. ocean winds can carry moisture with them and can bring rain and fog over inland areas' for K12 (OHVA to be exact)

Answer:

ocean currents regulate global climate, helping to counteract the uneven distribution of solar radiation reaching Earth's surface

Considering the definition of atomic mass, isotopes and atomic mass of an element, the average atomic mass of element x is 91.16759 amu.

The atomic mass is obtained by adding the number of protons and neutrons in a given nucleus of a chemical element.

Isotopes of the same element are those atoms where the atomic numbers are the same, but the number of neutrons is different.

The atomic mass of an element is the weighted average mass of its natural isotopes, taking into account the relative abundance of each of them.

In this case, you know:

Then, the average mass of the element x can be calculated as:

average mass= 89.90470 amu×0.5145 + 90.90565 amu×0.1122 + 91.90504 amu×0.1715 + 93.90632 amu×0.2018

Solving:

average mass= 91.16759 amu

Finally, the average atomic mass of element x is 91.16759 amu.

Learn more about average atomic mass:

brainly.com/question/4923781

brainly.com/question/1826476

brainly.com/question/15230683

brainly.com/question/7955048

#SPJ1

Answer:

b) Ar

Explanation:

Given data:

Mass of sample gas = 120.00 g

Volume of gas = 67.2 L

Identity of gas = ?

Solution:

We will calculate the molar mass do identify the sample:

Number of moles of gas:

PV = nRT

1 atm×67.2 L = n×0.0821 atm.L/mol.K×273 K

67.2 atm.L = n × 22.42atm.L/mol

n = 67.2 atm.L / 22.42atm.L/mol

n = 3 mol

Molar mass of gas:

Number of moles = mass/molar mass

Molar mass = 120.00 g/3 mol

Molar mass = 40 g/mol

The given sample of a gas is Ar.

John Dalton's original atomic theory contained the following key ideas and the incorrect one is that elements are made of tiny indivisible particles called atoms and is denoted as option A.

This is defined as the smallest unit of matter which forms a chemical element and Dalton proposed that it was indivisible which was later proved wrong.

It was later discovered that atom is made up of sub atomic particles such as proton, electron and neutron. This was therefore the reason why option A was chosen as the most appropriate choice.

Read more about Atom here https://brainly.com/question/6258301

#SPJ1

The options include:

A. elements are made of tiny indivisible particles called atoms

B. Atoms are unchanged in chemical reaction

C. Atoms can join together in whole number ratios to form compounds.

D. The atoms of each element are unique

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{8.32 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 13.820598...[/tex]

We have the final answer as

Hope this helps you

The molar mass of B(NO₃)₃ - Boron nitrate : 196.822 g/mol

In stochiometry therein includes  

Relative atomic mass (Ar) and relative molecular mass / molar mass (M)  

So the molar mass of a compound is given by the sum of the relative atomic mass of Ar  

M AxBy = (x.Ar A + y. Ar B)  

The molar mass of B(NO₃)₃ - Boron nitrate :

M B(NO₃)₃ = Ar B + 3. Ar N + 9.Ar O

M B(NO₃)₃ = 10.811 + 3. 14,0067 + 9. 15,999

M B(NO₃)₃ = 196.822 g/mol

Answer: A.ionic

Explanation:

Got it right

Answer:

Ionic

Explanation:

Answer:

Explanation:

The density is measured by: D=mV . Therefore, for the piece of wood in question the density could be calculated by: D=mV=57g125cm3=0.46gcm3 .

Answer:

Solute=the substance which a solvent dissolve to produce homogeneous mixture

Solvent= the substance in which a solute dissolve to produce homogeneous mixture

Explanation:

solvent: The liquid in which a solute is dissolved to form a solution.

solute: The component in a solution, dissolved in the solvent.

Answer: When an atom becomes a positive ion it pulls it's electrons closer, decreasing it's radius moreover, when it becomes a negative ion, it pulls it's electrons closer and decreases the radius

I hope this helps :)

Answer:

Ionization energy is the energy required to remove the most loosely bound electron from an isolated gaseous atom.

The ionization energy decreases as the size increases. The electrons get added to the new shell and the nuclear charge increases. But the effect of addition of new sheels overcomes the increase of nuclear charge.The valence shell moves far from the nucleus.

Thus the valence electron gets less tightly held by the nucleus and thus less energy is required to remove the valence electron.

Shielding effect can be defined as a reduction in the effective nuclear charge on the electron cloud, due to a difference in the attraction forces of the electrons on the nucleus. Thus as the size increases and the electrons move away from nucleus, the attractive forces decrease.

Answer:

V₂ = 106.5 mL

Explanation:

Given data:

Initial volume =200 mL

Initial pressure = 2 atm

Initial temperature = 35 °C (35 +273 = 308 K)

Final temperature = 55°C (55+273 = 328 K)

Final volume = ?

Final pressure = 4 atm

Formula:  

P₁V₁/T₁ = P₂V₂/T₂  

P₁ = Initial pressure

V₁ = Initial volume

T₁ = Initial temperature

P₂ = Final pressure

V₂ = Final volume

T₂ = Final temperature

Solution:

V₂ = P₁V₁ T₂/ T₁ P₂  

V₂ = 2 atm ×200 mL × 328 K / 308 K ×4 atm

V₂ = 131200 atm .mL. K / 1232 K.atm

V₂ = 106.5 mL

Explanation:

sugar is a compound because the elements are chemically combined but it also can be dissolved, tho the sugar itself isn't a solution, only when added to water

Answer:

If the fault develops in a situation of compression, then will be a first fault due to the fact that compression causes the hanging wall to be pushed up relative to the footwall.

Answer:

the Potential Energy that is happened are all actions.

Explanation:

Potential energy is a property of a system and not of an individual body or particle; the system composed of Earth and the raised ball, for example, has more potential energy as the two are farther separated.

in other words

In physics, potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors

Answer:

Explanation:

mjiio[mk'pk oikiom[,l

Answer:

The bigger marble may hold more momentum

Explanation:

Answer:

Nepal is rich in biodiversity

Answer:

Li3PO4 + Sn(CH3COO)2 ------> LiSnPo4 + Li2(CH3COO)2

Explanation:

Answer:

if the value of volume doubles but the mass stays the same, the value for density will be 1

pH of mixed solution = 4.3

A buffer solution is a solution that can maintain a good pH value due to the addition of a little acid or a little base or dilution.  

The buffer solution can be acidic or basic  

Acid buffer solution consists of weak acids and their salts.  

[tex]\tt \displaystyle [H^+]=Ka\times\frac{mole\:weak\:acid}{mole\:salt\times valence}[/tex]

valence according to the amount of salt anion  

mol CH₃COOH = 25 ml x 0.9 = 22.5 mlmol

mol NaOH = 25 ml x 0.45 = 11.25 mlmol

ICE method :

Reaction

NaOH + CH₃COOH ---> CH₃COONa + H₂O

11.25       22.5

11.25       11.25                       11.25        11.25

               11.25                        11.25        11.25

mol acid = 11.25, mol salt = 11.25, Ka CH₃COOH = 5.10⁻⁵

Then [H⁺]=

[tex]\tt [H^+]=5.10^{-5}.\dfrac{11.25}{11.25\times 1}\rightarrow salt~valence=1\\\\(H^+]=5.10^{-5}\\\\pH=5-log5=4.3[/tex]

If Justin drives 3 miles north and 1.5 miles to the east to get to school and takes him 45 minutes, his average speed/velocity is 6 miles/hour north east.

Speed is the amount of distance traveled by an object per unit of time. On the other hand, velocity is the amount of speed and the direction it is moving. Speed is a scalar quantity while velocity is a vector quantity.

To get the speed of Justin driving from home to his school, divide the distance he traveled by the amount it took him.

speed = (3 miles + 1.5 miles) / 45 minutes(1hr/60 minutes)

speed = 6 miles/hour

Taking note of the direction he traveled, the velocity will be:

velocity = 6 miles/hour north east

Learn more about velocity here: https://brainly.com/question/80295

#SPJ4

Answer:

A)

over time, the amount of atmospheric carbon dioxide increases

Explanation:

Answer: a) over time, the amount of atmospheric carbon dioxide increases

Explanation:

Answer:

Graphene is a nanomaterial that is often used with other compounds to desalinate and decontaminate water.

The electrical behavior of semiconductor devices and electronics can be engineered using a process called Doping

Explanation:

The limiting reactant​ : Fe

Reaction

3Fe + 4H₂O ⇒ Fe₃O₄ + 4H₂

mass of H₂O = 10 g

mol H₂O (MW=18 g/mol) :

[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{10}{18}=0.56[/tex]

mass of Fe = 16.8 g

mol Fe(MW=56 g/mol) :

[tex]\tt mol=\dfrac{16.8}{56}=0.3[/tex]

Limiting reactant : the smallest ratio between mol : reaction coefficient

Fe :

[tex]\tt \dfrac{0.3}{3}=0.1[/tex]

H₂O :

[tex]\tt \dfrac{0.56}{4}=0.14[/tex]

Fe as limiting reactant

Answer:

Temperature measures thermal energy (kinetic energy), and heat is the flow of thermal energy.

Explanation:

The difference between heat and temperature is that temperature measures thermal energy (kinetic energy), and heat is the flow of thermal energy.

Temperature is the measure of cold or heat, often measurable with a thermometer while heat is the flow of thermal energy from a substance with higher temperature to that with a lower temperature.

Temperature is a scalar quantity while heat is a vector quantity. This suggests that temperature has no direction while heat posseses direction.

Therefore, the difference between heat and temperature is that temperature measures thermal energy (kinetic energy), and heat is the flow of thermal energy.

Learn more about heat and temperature at: https://brainly.com/question/11464844

#SPJ2

Answer:

Explanation: Liquid from the lakes may have evaporated and seeped into the surface; scientists suspect seasonal changes — from winter to summer — also played a role in the lakes' disappearance. This infrared-color mosaic of data from the Cassini Visual and Infrared Mapping Spectrometer (VIMS) shows the north pole of Titan