could someone answer the first one for me, i’ll give brainliest. thx!

Answer:

i believe its 1.56

Explanation:

Answer:

Solid

Explanation:

because their molecules are tightly packed.

According to the forces of attraction, at  room temperature, the greatest attractive forces exist between particles of a solid.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Answer:

t(half-life) = 1600 yrs

Explanation:

All radio decay follows 1st order kinetics and therefore can be applied to the expression A = A₀e^(-kt)

A = current activity

A₀ = initial activity

k = decay constant

t = time of decay

Half-Life = 0.693/k

k = ln(A/A₀) / -t = ln(0.25) / -3200yrs = 4.33x 10⁻⁴ yrs⁻¹

Half-Life => t(1/2) = (0.693/4.33 x 10⁻⁴)yrs⁻¹ = 1600 yrs.

Answer:

you have to divide it

Explanation:

Answer:

whats the volume u can't find the density without dividing the mass by the volume

Answer:

ΔT = 0.78 °C

Explanation:

Given data:

Mass of Al = 9.5 g

Specific heat capacity of Al = 0.9 J/g.°C

Temperature change = ?

Heat added = 67 J

Solution:

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

67 J = 9.5 g × 0.9 j/g.°C × ΔT

67 J = 85.5 j/°C × ΔT

ΔT = 67 J  /  85.5 j/°C

ΔT = 0.78 °C

According to the forces of attraction,adding heat changes liquid to gas;  and removing heat  changes liquid to solid.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Answer:

Mount Saint Helens erupted

Answer: The correct answer is option A. [tex]Na^+\text{ and }Cl^-[/tex]

Explanation:

An ionic compound is defined as the compound formed by the complete transfer of electrons from one element (forming cation) to another element (forming anion)

Sodium (Na) is an element having atomic number 11 and its electronic configuration is [tex]1s^22s^22p^63s^1[/tex]

It will loose 1 electron to form [tex]Na^+[/tex] ion (cation)

Chlorine (Cl) is an element having atomic number 17 and its electronic configuration is [tex]1s^22s^22p^63s^23p^5[/tex]

It will gain 1 electron to form [tex]Cl^-[/tex] ion (anion)

The ionic compound so formed will have the chemical formula of NaCl.

Hence, the correct answer is option A. [tex]Na^+\text{ and }Cl^-[/tex]

Answer:

2Mg+O2 = 2MgO is the balanced equation of this reaction. When Mg +O2 reacts MgO is formed. The number of atoms of each element on reactant and product side must be equal

Explanation:

Ur welcome

Answer:

2Mg+O2 ⇒ 2MgO

Answer:

292.5

Explanation:

65x4=260

65 divded  by 2 = 32.5

260+32.5=292.5

Answer:

Molarity = 1.5 M

Explanation:

Given data:

Molarity of solution = ?

Number of moles of NaCl = 0.30 mol

Volume of water = 200 mL (200/1000 = 0.2 L)

Solution:

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles of solute / L of solution

Molarity = 0.30 mol / 0.2 L

Molarity = 1.5 M

Answer:

An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions. Ionic bonds are formed between a cation, which is usually a metal, and an anion, which is usually a nonmetal. A covalent bond involves a pair of electrons being shared between atoms.

Answer:

Parasitism. A symbiotic relationship between two species in which one benefits and the other is harmed.

Explanation:

:)

Answer: Option (a) is the correct answer.

Explanation:

pH is the negative logarithm of concentration of hydrogen ion.

That is,    pH = -log [tex][H^+][/tex]

Hence, pH of solution with [tex][H^+] = 1 \times 10^{-11}[/tex] is calculated as follows.

         pH = -log [tex][H^+][/tex]

               = -log [tex](1 \times 10^-{11})[/tex]

               = 11

Therefore, pH of solution with [tex][H^+] = 1 \times 10^{-11}[/tex] is 11.

1. 18 L

2. 20.832 L

Given

Combustion of ethane

Required

Volume of CO₂

Solution

Avogadro's Law :

In the same T,P and V, the gas contains the same number of molecules  

So the ratio of gas volume will be equal to the ratio of gas moles  

V₁/n₁=V₂/n₂

1. From equation, mol ratio of C₂H₆ : CO₂ ⇒ 2 : 6

so the volume of CO₂ :

= 6/2 x 6 L

= 18 L

2. mol ethane (MW=32 g/mol) :

= mass : MW

= 10 g : 32 g/mol

= 0.31

mol CO₂ :

= 6/2 x 0.31

= 0.93

The volume CO₂(assume at STP) = 20.832 L

Answer:

the chemical equation is balanced ❤

Answer:

Na

Explanation:

Na Because it's exist in group 1

Answer:

la tabla de la derecha muestra una lista de los elementos ordenados por su energía de ionización. El elemento de mayor energía de ionización es el Helio, y el de menor el Cesio. La unidad de energía de ionización es el electrón voltio (eV).

1 sodium bromide

2 scandium

3 aluminium selenide

4 sodium fluoride

5 potassium chloride

6 strontium fluoride

7 magnesium bromide

8 sodium oxide

9 lithium oxide

10

11 lithium fluoride

12 calcium bromide

13 methyl beta-d-glucopyeanoside

14

15sodium chloride and 16 sodium nitrate

(hope it helped) ❄️❄️❄️

Answer:

a. Grow

b. Reproduce

c. Use energy

e. Produce waste

Explanation:

A single-celled organism is an organism which has only one cell while a multicellular organism possess more than one cell that has differentiated into performing more specific roles. However, irrespective of the difference in number of cells between a single celled and multicellular organism, all cells must possess certain characteristics that prove that they are living.

Some of these characteristics include:

- Growth: All living cells including must undergo growth, characterized by the increase in height and width of the organism.

- Reproduction: All living cells are capable of replicating themselves to form new organisms. This is called reproduction.

- Use energy: Cells, whether single celled or multicellular, make use of energy derived by the process of cellular respiration to perform their cellular functions.

- Produce waste: All cells remove waste in a process called EXCRETION.

However, not all organisms are capable of getting their own food. This is a characteristics of autotrophic organisms, and it's not a function of whether an organism is single celled or multicellular.

Answer:

Answer 1

light energy from the sun.

answer 2

Microscopic organisms are tiny life forms, often consisting of a single cell. ... Algae — these are single celled plants also known as phytoplankton (from the Greek, meaning drifting plants)

answer 3

Some phytoplankton are bacteria, some are protists, and most are single-celled plants. Among the common kinds are cyanobacteria, silica-encased diatoms, dinoflagellates, green algae, and chalk-coated coccolithophore

Explanation:

it uses light to convert water and carbon dioxide molecules into glucose (sugar molecule) and oxygen

Answer:

It's called a theory because it has not been proven yet. so we can not claim it to be a fact without proof.

Answer: There is no concrete evidence.

Explanation: If we could do an experiment and create the Big Bang and watch it happen and study it, it would be law. It's for the same reason that evolution is considered a theory. We are not watching it take place and there is no eye witness account of evolution happening because evolution happens over millions and millions of years. If we could sit here and watch the universe be created without need for simulations or theories, then it would be law.

Answer:

P =  14.1 atm    

Explanation:

Given data:

Mass of methane = 64 g

pressure exerted by water vapors = ?

Volume of engine = 24.0 L

Temperature = 515 K

Solution:

Chemical equation:

CH₄ + 2O₂      →      CO₂ + 2H₂O + energy

Number of moles of methane:

Number of moles = mass / molar mass

number of moles = 64 g/ 16 g/mol

Number of moles = 4 mol

Now we will compare the moles of water vapors and methane.

              CH₄          :            H₂O  

                 1            :             2

                 4            :         2/1×4 = 8 mol

Pressure of water vapors:

PV = nRT

R = general gas constant = 0.0821 atm.L/mol.K

P = 8 mol × 0.0821 atm.L/mol.K× 515 K / 24.0 L

P = 338.25 atm.L/ /  24.0 L

P =  14.1 atm      

Answer:

products

Explanation:

chemical reaction is the process in which atoms present in the starting substances rearrange to give new chemical combinations present in the substances formed by the reaction. These starting substances of a chemical reaction are called the reactants, and the new substances that result are called the products.

Answer:

Molecules are made of two or more atoms

Molecules are made of atoms of the same element or different elements.

Molecules range in size.

Explanation:

A molecule is formed whenever two or more atoms combine. Hence we can define a molecule as a combination of two or more elements that are combined chemically and can not be separated by any physical means.

Molecules may be composed of the same atoms as in O2, F2 etc or different atoms as in CO2, H2O, etc.

The sizes of molecules differ. Some molecules are quite small in size while others are quite large in size.

Answer:

Molecules are made of two or more atoms

Molecules range in size

Molecules are made of atoms of the same element or different elements.

Answer:

See explanation

Explanation:

In the Rutherford experiment, alpha particles were directed at the same spot on a thin gold foil.

As the alpha particles hit the foil, most of the alpha particles went through the foil. In Rutherford's interpretation, most of the particles went through because the atom consisted largely of empty space.

However, some of the alpha particles were deflected through large angles, in Rutherford's interpretation, the deflected alpha particles had hit the dense positive core of the atom which he called the nucleus.

This accounted for their scattering through large angles throughout the foil in all directions.

Answer:

B

Explanation:

hope this helps :)

Explanation:

In order to produce CuCl2 crystals, there have to be copper and chlorine atoms.

Copper oxide (CuO) has copper atoms. We need the acid to have chlorine atoms.

Out of HCl, HNO3 and H2SO4, only HCl has chlorine atoms.

CuO + 2HCl => CuCl2 + H2O.

Hence the answer is Hydrochloric acid.

The statement that describes what happens as you rub your hands together is Kinetic energy is converted to heat energy. The correct option is B.

Kinetic energy is the energy that is used when doing some work. It is possessed when an object is in motion. To move a  body from its resting position to its motion position, kinetic energy is used. When a certain object moves with a certain speed, then it is maintaining its kinetic energy.

When someone is rubbing his hands, it means his hands are in motion, so kinetic energy is in use. Rubbing produced friction which produces heat, so the rubbing hands will convert the kinetic energy into heat energy.

Thus, the correct option is B. Kinetic energy is converted to heat energy.

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