Help plz 11 points i need help plz give me TWO not one TWO
!!

Help Plz 11 Points I Need Help Plz Give Me TWO Not One TWO!!

Answers

Answer 1
Carbon and hydrogen

Related Questions


Explain how atomic
radius, valence electrons
and effect nuclear charge
creates the trend for metal
reactivity.

Answers

Answer:A higher effective nuclear charge causes greater attractions to the electrons, pulling the electron cloud closer to the nucleus which results in a smaller atomic radius. Down a group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital.

Answer:

A higher effective nuclear charge causes greater attractions to the electrons, pulling the electron cloud closer to the nucleus which results in a smaller atomic radius. Down a group, the number of energy levels increases, so there is a greater distance between the nucleus and the outermost orbital.Explanation:

Which is a pure substance?

They are chemically bonded together.
They can be classified as pure substances.
They have fixed ratios between their components.
They can be separated by physical processes.

Answers

Answer: C. They have fixed ratios between their components.

Law of Universal Gravitation (what factors affect gravity and how?)

Answers

Explanation:

Hey there!

According to the law of gravitation, the factors that affects the gravity are:

Mass of the heavenly bodies.Distance from the centre of the body to next body.

Mass of heavenly bodies:The mass of heavenly bodies affect the gravity. We know that gravity is directly proportional to the mass of heavenly bodies. so, when the mass is more there is more gravity and where there is less mass there is less gravity.

Distance from the centre of the body to next body: It is one of the factor to influence gravity. When there is more distance there is less gravity and where there is distance more force is there. Is means gravity is inversely proportional to the distance between the bodies.

Hope it helps...

Which stage in a frog's life cycle is most similar to a plant seed?
A Eggs
B. Tadpole
C. Froglet
D. Adult Frog

Answers

A egg because it’s the earliest stage and still had much growth to come to it if properly taken care of

An object with a
mass of 7 g and a
volume of 10 mL is
most likely what
substance?

Answers

Answer:

Ethanol

Explanation:

Given parameters:

Mass of the object  = 7g

volume of the object  = 10mL

Unknown:

The kind of substance it is = ?

Solution:

Since from the parameters, we can determine the density of the object. Density is an intensive property of substances.

So, we simply find the density and check a density table for the type of substance it is.

  Density is the mass per unit volume.

        Density  = [tex]\frac{mass}{volume}[/tex]

Let us take the volume to cm³;

             10mL  = 10cm³

      Density  = [tex]\frac{7}{10}[/tex] = 0.7g/cm³

This is most likely ethanol

How many protons, neutrons, and electrons does 35/17 Cl ^ 1- have?

Answers

Answer:

In accordance to the pic

The number of protons in Cl-35 is 17 and the number of neutrons is 18. The number of Cl is 17 whereas the chloride ion Cl⁻ have 18 electrons.

What is chlorine?

Chlorine is 17th element in periodic table. Cl is includes in the 17th group of p -block. Cl contains 7 valence electrons and it needs one more electron to attain complete configuration.  It is highly electronegative and will easily gain an electron to achieve octet.

Atoms in neutral state have equal number of electrons and protons and this number is equal to the atomic number. The mass number is the sum of number of protins and neutrons.

The atomic number of Cl is 17. Hence the number of protons is 17 and the  mass number is 35. So that number of neutrons is 35 - 7 =18. When Cl gains an electron it forms the anion Cl⁻. Hence, the number of electrons in Cl⁻ is 18.

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An elemental metal contains how many types of atoms?
a. 1
b. 2
c. 3
d. 4

Answers

Answer:

a

Explanation:

all elemental metals are made up of only one type of element

Answer:

It is 1.

Explanation:

Which part of the immune system can be "trained" using vaccines?

Answers

The adaptive immune system, because it is more specific to the foreign substances in the body and adapts to remove or fight them

help please I need help with these two questions answer truthfully get brainliest?!!​

Answers

Answer:

1. 3x-3=18

Value of x=7

2. 4x-5=23

value of x=7

Answer:

b 7 for one

a 3 for two

Explanation:

Potassium Phthalate, KC8H604, is a main source of whistle fuel for many fireworks. A standard firework had 25g of potassium phthalate.​ Calculate the following:
The molar mass of the compound.
How many molecules of fuel there are
The number of moles of Carbon

Answers

Answer:

Explanation:

The given compound is:

           KC₈H₆O₄

Mass of the compound = 25g

Molar mass of the compound

KC₈H₆O₄

   Atomic mass of K  = 39

                             C  = 12

                             H = 1

                             O = 16

Molar mass of the compound  = 39 + 8(12) + 6 (1) + 4(16)

                                                   = 205g/mol

Number of molecules of fuel there in:

Find the number of moles then convert this to number of molecules;

    Number of moles  = [tex]\frac{mass}{molar mass}[/tex]  

    Number of moles  = [tex]\frac{25}{205}[/tex]   = 0.12mol

1 mole of a compound contains 6.02 x 10²³ molecules

 0.12 mole of the phthalate will contain 0.12 x 6.02 x 10²³ =

              7.34 x 10²²molecules

Number of moles of Carbon

  1 mole of the phthalate contains 8 mole of carbon

  0.12 mole of the phthalate will contain 0.12 x  8  = 0.96mole of carbon

How many atoms are in a sample containing 4.000 moles of carbon?
A)6.022 x 10
23
atoms
B)2.408 x 10
24
atoms
O
24
C)7.233 x 10 atoms
D)2.893 x 10
25
atoms

Answers

Answer:

c I think but that's only what i think

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 24.088×10²³ atoms of carbon are in sample containing 4.000 moles of carbon. The correct option is option B.

What is mole?

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

number of atoms/molecules/ formula units of carbon= number of moles of carbon × 6.022×10²³

number of moles of carbon= 4 moles

substituting all the given values in the above equation, we get

number of atoms/molecules/ formula units of carbon= 4 × 6.022×10²³

number of atoms/molecules/ formula units of carbon=2.4088×10²⁴ atoms of carbon

There are 2.4088×10²⁴ atoms of carbon

Therefore, 24.088×10²³ atoms of carbon are in sample containing 4.000 moles of carbon. The correct option is option B.

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Balance this equation.
_Mg +_Cl2 -->_MgCl2

Answers

Answer:

1Mg + 1Cl2 = 1MgCl2

Explanation:

Hi! When balancing an equation, you want to make sure that there are equal amounts of each element on both sides. When looking at the equation that you provided in the question, look and count how many of each element are on each side. I can see that there is 1 Mg ion on the left and 1 Mg ion on the right. There are also 2 Cl ions on the left and 2 Cl ions on the right. Because they are already equal, the coefficients in front of each compound will be 1. If the amounts were different on each side, that is when you would need to add different coefficients.

Hope this helps! Let me know if you have any other questions about this!

1.86 g of ethanol reacts with 10.0 g of oxygen. What is the total volume of gas present (in L) after the reaction is complete, assuming the reaction takes place at 1.00 atm and 25oC?

Answers

Answer:

See explanation

Explanation:

The equation of the reaction is;

C 2 H 6 O(l)  +  3 O 2 (g)  → 2 CO 2 ( g )  +  3 H 2 O(l )

Next we have to determine the limiting reactant, this reactant gives the least number of moles of product.

Number of moles of C 2 H 6 O = mass/molar mass = 1.86g/ 46.07 g/mol = 0.04 mols

From the equation;

1 mol of ethanol yields 2 mols of CO2

0.04 moles of ethanol yields 0.04 * 2/1 = 0.08 mols of CO2

For water;

1 mol of ethanol yields 3 mols of water

0.04 moles of ethanol yields 3 * 0.04/1 = 0.12 mols of water

Also;

Number of moles of oxygen= 10g/32g/mol = 0.31 moles

3mols of O2 yields 2 moles of CO2

0.31 moles of O2 yields 0.31 * 2/3 = 0.21 moles of CO2

For water;

3 moles of O2 yields 3 moles of water

0.31 moles of O2 yields 0.31 * 3/3 = 0.31 moles of water

Hence ethanol is the limiting reactant.

From  PV=nRT

Volume of CO2 is;

V = nRT/P

V = 0.08 * 0.082 *298/1 = 1.95 L

Volume of water;

V = nRT/P

V= 0.12 * 0.082 * 298/1

V= 2.93 L

Total volume of gases after reaction = 1.95 L + 2.93 L = 4.88 L

Which of the physical processes below result in the formation of metamorphic rocks

Answers

i dont see any processes below

Answer:

Heat and pressure

Explanation:

got it on study island

Calculate the energies of the n=2 and n=3 states of the hydrogen atom in Joules per
atom

Answers

Answer:

See Explanation

Explanation:

Positional Energy for electron as function of principle energy level (n)

=> Eₙ = -A/n²; A = 2.18x10⁻¹⁸J

Positional Energy for electron in n=2 => E₂ = -2.18x10⁻¹⁸/(2)² = -5.45x10⁻¹⁹J

Positional Energy for electron in n=3 => E₃ = -2.18x10⁻¹⁸/(3)² = -2.42x10⁻¹⁹J

ΔE(n=3→2) = -5.45x10⁻¹⁹J - (-2.42x10⁻¹⁹J) =   -3.03x10⁻¹⁹J

How can the rate of a reaction be increased?

(A) decreasing the amount of reactants

(B) having more surface area

(C) diluting a solution

(D) lowering the temperature

Answers

Explanation:

Rate of reaction can be increased by having more surface area.

Therefore,

Option B is correct✔

Answer:

b

Explanation:

How does adding a lone pair affect the position of existing atoms and lone pairs

Answers

Answer:

How does adding a lone pair affect the position of existing atoms and lone pairs? It decreases the angles between the atoms - the atoms are moving closer because they are being repelled further away from the lone pairs then they are from the other atoms

Explanation:

hope it helps!

They get closer together, the bond angle decreases, etc.

all of the following are properties of ionic compounds except:

A. Ionic compounds have low melting points,

B. Ionic compounds have high boiling points

C. Ionic compounds conduct electricity when dissolved in water

D. Ionic compounds are solid at room temperature

Answers

Answer:

A

Explanation:

They have generally high melting point compared to covalent compounds because they are formed by electrostatic force of attraction between two opposite charge is not easy to melt them in low melting point.

Ionic compounds have high melting and boiling points. Therefore, option A is not a property of ionic compound. Hence, option A is the correct answer.

Ionic compounds are neutral compounds. Ionic compounds are formed from cations and anions. Positively charged ion (cation) and negatively charged ion (anion) are held together with strong ionic bond.  Some main properties of ionic compounds are,

High melting point and boiling pointsHave definite size and shapeConduct electricity in molten statesoluble in water and not soluble in organic solvents

Thus, we can conclude ionic compounds have high melting and boiling points. Hence, option A is the correct answer.  

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d = 7 V = 950 cm M = 95 g
0.1 g/cm3
0.1 cm3
90,250 g
90,250 g/cm3

Answers

Answer:

daddy chill

Explanation:

What happens to molecular energy(heat) in water when water vapor becomes a liquid?
Group of answer choices
Water vapor gives up heat energy.

Water vapor absorbs heat energy.

As water's mass increases it absorbs energy.

Water vapor retains the same heat energy.

Answers

Answer:

Water vapor retains the same heat energy.

Answer:

water vapor gives up heat energy.

Explanation:

Took a quiz and got it right

What is immigration and emigration

Answers

immigration is moving from current place to somewhere else whereaese emigration is reverse of it .

Answer:

well for me I think

Explanation:

immigration is the movement which involves an individual moving from a present place to another environment

That is going out

WHILE

Emigration is the process where a person comes into a particular environment

That means coming in

What type of reaction occurs between an element and a compound?

Answers

Answer:

exothermic reaction

Explanation:

because it occurs in the presence of heat

Will give brainliest

Answers

Answer:

C

Explanation:

The concept behind, is mole ratio of Al:FeO

as we go down a group
the number of valence electrons?
a Increases
b Decreases
C Remains the same
d None of the above

Answers

Answer:

Number of valence electrons stays the same

remains the same

it remains teh same

Which of the following would be most useful in trying to obtain procedural information to replicate an experiment previously published?

Answers

Answer: Peer-reviewed journal article is the most useful because the information in them had been carefully scrutinized and aproved by people who are experts in that particular field.

A paint chip is placed in ethanol and curls what type of paint is it

Answers

Answer:

it is probably acrylic or latex

Explanation:

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the type of paint is  acrylic or latex.

What is chemical Compound?

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.  If the chip remains flat when put in ethanol, it is probably an oil-based paint. If the chip curls, it is probably acrylic or latex. So, The type of paint is  acrylic or latex.

Therefore, the type of paint is  acrylic or latex.

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15
Question 56 (1 point)
What is the name of the compound with the chemical formula SnSnO3?

Answers

Answer: sodium sulfite

Explanation:

Which event would most likely lead to a thunderstorm g i v i n g b r a i n l e s i t HELP
--

Answers

Answer:

A

Explanation:

hope it helps

Answer:

A

Explanation:

I got right

An ideal gas sample is confined to 3.0 L and kept at 27 °C. If the temperature is raised to 77 °C and the initial pressure was 1500 mmHg, what is the final pressure?

Answers

The gas is confined in 3.0 L container ( rigid container) ⇒ the volume remains constant when the temperature is increased from from 27oC to 77oC and therefore V1=V2 .

Hope it helps you please mark as brainlist

Ideal gas law is valid only for ideal gas not for vanderwaal gas. Ideal gas is a hypothetical gas. Vanderwaal gas can behave as ideal gas at low pressure and high temperature. Therefore the final pressure is 1,750 mmHg.

What is ideal gas equation?

Ideal gas equation is the mathematical expression that relates pressure volume and temperature.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of gas

V= volume of gas

n =number of moles of gas

T =temperature of gas

R = Gas constant = 0.0821 L.atm/K.mol

At constant volume, the above equation can be rearranged as

P₁/T₁ = P₂/T₂

Substituting all the given values in the above equation, we get

1500 ÷300= P₂÷350

P₂ =1,750 mmHg

Therefore the final pressure is 1,750 mmHg.

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Describe the reaction of zinc with sulphuric acid​

Answers

Answer:

Zinc reacts with dilute sulphuric acid to produce hydrogen gas (H2) and zinc sulphate. This is an example of displacement reaction of a non-metal by a metal. ... ZnSO4 is different in chemical composition and chemical properties than Zn and H2SO4 so it is a chemical change.

Answer:

Reaction of Zinc with Dilute Sulphuric Acid

Zinc is more reactive than hydrogen and it displaces hydrogen from dilute acids. Zinc reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas is evolved. This is a single displacement reaction of a non-metal by a metal. ... So, this reaction is a chemical change.

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