If you test an unknown organic compound and find it to be soluble in 5% aqueous NaHCO3, what functional group does it probably contain?

Answer:

1.36 atm

Explanation:

We'll begin by converting 97 °C to Kelvin temperature. This can be obtained as follow:

T(K) = T(°C) + 273

T(°C) = 97 °C

T(K) = 97 °C + 273

T(K) = 370 K

Finally, we shall determine the pressure in the hot water bottle. This can be obtained as follow:

Volume = constant

Initial temperature (T₁) = stp = 273 K

Initial pressure (P₁) = 1 atm

Final temperature (T₂) = 370 K

Final pressure (P₂) =?

P₁ / T₁ = P₂ / T₂

1 / 273 = P₂ / 370

Cross multiply

273 × P₂ = 370

Divide both side by 273

P₂ = 370 / 273

P₂ = 1.36 atm

Therefore, the pressure in the hot water bottle is 1.36 atm.

Answer:

0.149 moles

Explanation:

The problem is asking us to convert 9.49 grams of copper into moles. We can do that by using copper's molar mass:

Now we proceed to calculate the number of moles:

There are 0.149 moles of copper in the wire.

Answer:

The external atmospheric pressure decreases and so does the boiling point of the liquid.

Explanation:

We know that pressure decreases with height. Thus atmospheric pressure decreases at higher elevation.

The implication of this is that, if I take a liquid from sea level to a higher elevation, the external atmospheric pressure on the liquid will decrease and so does its boiling point.

Hence, the liquid boils at a lower temperature when placed at a higher elevation. For this reason, the boiling point of a liquid is lower on the mountain.

Answer:

4.22 g/mL

Explanation:

First we calculate the mass of the solid via mass difference:

Then we calculate the volume of the solid, once again by difference:

Finally we calculate the density in g/mL:

The density of an irregular solid will be "4.96 g/mL".

According to the question,

→ The Mass of solid will be:

= [tex][(Mass \ of \ solid+ Weighing \ vessel)-(Mass \ of \ weighing)][/tex]

By substituting the values, we get

= [tex]9.441-1.005[/tex]

= [tex]8.436 \ g[/tex]

→ The Volume of solid will be:

= [tex][(Volume \ of \ liquid \ in \ grad. \ cylinder+Solid)-(Volume \ of \ grad. \ cylinder)][/tex]

= [tex]5.15 - 3.45[/tex]

= [tex]1.70 \ mL[/tex]

hence,

→ The density of irregular solid will be:

= [tex]\frac{Mass}{Volume}[/tex]

= [tex]\frac{8.436}{1.70}[/tex]

= [tex]4.96 \ mL[/tex]

Thus the above is the correct answer.

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Answer:

Jaheem has a goal running a total of 125 miles this month. Each day that he ran, he ran 7 miles. Which expression could Jaheem use to determine how many miles he has left to run after running for d days?

x a.

125 – 7d

x b.

7d + 125

x c. fraction numerator 125 over denominator 7 d end fraction

x d.

7dExplanation:Jaheem has a goal running a total of 125 miles this month. Each day that he ran, he ran 7 miles. Which expression could Jaheem use to determine how many miles he has left to run after running for d days?

x a.

125 – 7d

x b.

7d + 125

x c. fraction numerator 125 over denominator 7 d end fraction

x d.

7d

Answer:

HCl(aq) + KOH(aq)---------->KCl (aq)+ H2O(l)

Answer:

Diabetes is a group of diseases that affect how your body uses blood sugar (glucose). Glucose is vital to your health because it's an important source of energy for the cells. Cells are everywhere including the blood, bones and muscles. When you have diabetes, you don’t have enough insulin in your blood (an organ in your body called the pancreas makes insulin). Insulin controls the movement of blood sugar into the cells of the body.

Explanation:

Answer:

c = π/T*R

c = 0.199M

Explanation:

Is measured to be 5.1 atm at an absolute temperature of 312. K. Write an equation that will let you calculate the molarity c of this solution. Your equation should contain only symbols. Be sure you define each symbol other than R.

The osmotic pressure of a solution, π, is defined as:

π = c*T*R

As we know osmotic pressure π = 5.1atm, T = 312K and R = 0.082atmL/molK

we can replace in the equation as follows:

π= c*T*R

c = 5.1atm/312K*0.082atmL/molK

Answer:

60ug

Explanation:

If it has experienced two half lives, that means it has been halved twice. in that case, to undo it, just multiply it by two twice. 0.15ug * 2 = 0.30ug. 0.30ug * 2 = 0.60ug. Hope this helps.

Hydrogen is a diatomic gas with two atoms (di meaning two). H2 is referred to as molecular hydrogen because hydrogen atoms are covalently joined together to form a molecule.

Because two hydrogen molecules are connected to one other by a covalent connection, hydrogen is denoted as H2.

Hydrogen has only one electron, so to complete its duet(octet in case of nitrogen) it has to bond with another hydrogen molecule to be stable and also exist.

You can remember it like this :

H = element

H2 = gas

Other diatomic gases :

O2 (oxygen)

N2 (nitrogen)

Answer:

C: Ion

Explanation:

We are told that the atom has;

9 protons

10 electrons.

Now, in chemistry, when number of electrons(negative) is more than number of protons(positive), we say that the atom is negatively charged.

Now, looking at the options;

- alpha particles have 2 protons and 2 neutrons and so it is not correct

- for an atom to be neutrally charged, number of protons must be equal to number of electrons. Thus it is not correct.

- For an atom to be an ion, it means that there is an unequal amount of electrons and protons. If the atom has more electrons than protons, it is called anion(negative ion) but if it has less electrons than protons, it is called cation(positive ion).

Thus, option C is the correct answer.

Answer:

See Explanation

Explanation:

1 mole of Cl2 gas occupies 22.4 L

x moles of Cl2 gas occupies 5.24 L

x= 1 × 5.24/22.4

x= 0.23 moles of Cl2

According to the kinetic theory of gases, the particles of a gas are in constant random motion and collide with each other and the walls of the container. Collision between gas particles are perfectly elastic.

Hence the statement that particles must not be able to move in any fixed or open container is false according to the kinetic theory of gases.

Answer:

The polarity of the carbonyl group notably affects the physical properties of melting point and boiling point, solubility, and dipole moment. Hydrocarbons, compounds consisting of only the elements hydrogen and carbon, are essentially nonpolar and thus have low melting and boiling points.

Explanation:

pls mark brainliest and these are my notes from last year.

Answer:

The most stable conformer would be the anti-conformer when the substituent methyl groups are farthest away from each other.

Explanation:

Isomers are chemical compounds with the same molecular formula but with different molecular structures.

Conformers are a special type of isomers that produce different structures when the substituents of a Carbon-Carbon single bond (C-C) are rotated.

In 2,3 dimethyl butane, the substituent methyl groups are located around the second and third Carbon to Carbon single bond.

To achieve a stable configuration, the methyl group substituents need to be as far apart as possible (that is, in an anti-position) to minimise repulsion.

The closer the methyl groups are to each other, the more they repel each other and the more unstable the conformer becomes.

This question is incomplete, the complete question is;

A sample of polystyrene, which has a specific heat capacity of 1.880 J.g⁻¹, is put into a calorimeter (see sketch at right) that contains 300.0 g of water. The polystyrene sample starts off at 94.9 °C and the temperature of the water starts off at 22.0. When the temperature of the water stops changing it's 27 °C . The pressure remains constant at 1 atm.

Calculate the mass of the polystyrene sample. Be sure your answer is rounded to 2 significant digits.

Answer:

the mass of the polystyrene sample is 57 g

Explanation:

Given the data in the question;

mass of water m[tex]_{water[/tex]  = 300 g

Temperature of water T[tex]_{water[/tex] = 22 °C

Specific heat capacity of water C[tex]_{water[/tex] = 4.184 J/g°C

mass of the polystyrene sample m[tex]_{polystyrene[/tex]  = ?

T[tex]_{polystyrene[/tex] = 94.9 °C

Specific heat capacity of polystyrene; C[tex]_{polystyrene[/tex] = 1.880 J.g⁻¹.°C⁻¹

T = 27.7 °C

Now, using heat conservation equation

heat lost by polystyrene = heat gained by water

m[tex]_{polystyrene[/tex] × C[tex]_{polystyrene[/tex] × ( T[tex]_{polystyrene[/tex] - T ) = m[tex]_{water[/tex] × C[tex]_{water[/tex] × ( T - T[tex]_{water[/tex] )

We substitute

m[tex]_{polystyrene[/tex] × 1.880 × ( 94.9 - 27.7 ) = 300 × 4.184 × ( 27.7 - 22 )

m[tex]_{polystyrene[/tex]  × 1.880 × 67.2 = 300 × 4.184 × 5.7

m[tex]_{polystyrene[/tex]  × 126.336 = 7154.64

m[tex]_{polystyrene[/tex] = 7154.64 / 126.336

m[tex]_{polystyrene[/tex] = 56.63 ≈ 57 g   { 2 significant figures }

Therefore, the mass of the polystyrene sample is 57 g

Albert Einstein

Marie Curie

Isaac Newton

Charles Darwin

Nikola Tesla

Galileo Galilei

Ada Lovelace

Please mark me brainliest!

Albert Einstein Charles Darwin Robert Hooke Issac Newton

Galileo Galilei

Answer:

6

Explanation:

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Answer:

(a): Precipitate of calcium carbonate will form.

(b): Precipitate of barium sulfate will form.

(c): Precipitate of silver iodide will form.

(d): Precipitate of sodium chromate will form.

Explanation:

Complete ionic equation is defined as the equation in which all the substances that are strong electrolytes present in an aqueous state and are represented in the form of ions.

Net ionic equation is defined as the equations in which spectator ions are not included.

Spectator ions are the ones that are present equally on the reactant and product sides. They do not participate in the reaction.

(a):

The balanced molecular equation is:

[tex]CaCl_2(aq)+K_2CO_3(aq)\rightarrow 2KCl(aq)+CaCO_3(s)[/tex]

The complete ionic equation follows:

[tex]Ca^{2+}(aq)+2Cl^-(aq)+2K^+(aq)+CO_3^{2-}(aq)\rightarrow 2K^+(aq)+2Cl^-(aq)+CaCO_3(s)[/tex]

As potassium and chloride ions are present on both sides of the reaction. Thus, they are considered spectator ions.

The net ionic equation follows:

[tex]Ca^{2+}(aq)+CO_3^{2-}(aq)\rightarrow CaCO_3(s)[/tex]

Precipitate of calcium carbonate will form.

(b)

The balanced molecular equation is:

[tex]BaCl_2(aq)+MgSO_4(aq)\rightarrow MgCl_2(aq)+BaSO_4(s)[/tex]

The complete ionic equation follows:

[tex]Ba^{2+}(aq)+2Cl^-(aq)+Mg^{2+}(aq)+SO_4^{2-}(aq)\rightarrow Mg^{2+}(aq)+2Cl^-(aq)+BaSO_4(s)[/tex]

As magnesium and chloride ions are present on both sides of the reaction. Thus, they are considered spectator ions.

The net ionic equation follows:

[tex]Ba^{2+}(aq)+SO_4^{2-}(aq)\rightarrow BaSO_4(s)[/tex]

Precipitate of barium sulfate will form.

(c):

The balanced molecular equation is:

[tex]AgNO_3(aq)+KI(aq)\rightarrow KNO_3(aq)+AgI(s)[/tex]

The complete ionic equation follows:

[tex]Ag^{+}(aq)+NO_3^-(aq)+K^+(aq)+I^{-}(aq)\rightarrow K^+(aq)+NO_3^-(aq)+AgI(s)[/tex]

As potassium and nitrate ions are present on both sides of the reaction. Thus, they are considered spectator ions.

The net ionic equation follows:

[tex]Ag^{+}(aq)+I^{-}(aq)\rightarrow AgI(s)[/tex]

Precipitate of silver iodide will form.

(d):

The balanced molecular equation is:

[tex]2NaCl(aq)+(NH_4)_2CrO_4(aq)\rightarrow 2NH_4Cl(aq)+Na_2CrO_4(s)[/tex]

The complete ionic equation follows:

[tex]2Na^{+}(aq)+2Cl^-(aq)+2NH_4^+(aq)+CrO_4^{2-}(aq)\rightarrow 2NH_4^+(aq)+2Cl^-(aq)+Na_2CrO_4(s)[/tex]

As ammonium and chloride ions are present on both sides of the reaction. Thus, they are considered spectator ions.

The net ionic equation follows:

[tex]2Na^{+}(aq)+CrO_4^{2-}(aq)\rightarrow Na_2CrO_4(s)[/tex]

Precipitate of sodium chromate will form.

Answer:

1

It also moves to the left.

Explanation:

When Na₂SO₄ is added to the equilibrium system then the equilibrium shifts to the left, and the concentration of Ba²⁺(aq) decreases.

Equilibrium law states that if any external stress is applied at the equilibrium state of any reaction then reaction will shift towards that side where the stress gets reduced.

Given chemical reaction is:

BaSO₄ ⇄ Ba²⁺ + SO₄²⁻

If in this equilibrium state, we add Na₂SO₄ as a result of which it increases the concentration of sulfate ion and equilibrium will shift towards the left side to maintain the concentration.

Hence the equilibrium shifts to the left, and the concentration of Ba²⁺(aq) decreases.

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Answer:

Absorbed

Released

Released

Explanation:

The formation of a cation is an endothermic process because energy must be absorbed in order to remove an electron from an atom.

Similarly, energy is evolved when an electron is added to an atom to form a negative ion.

The formation of an ionic compound is an exothermic process. Since ionic compounds are more stable than the individual ions separated by a distance, the excess energy of the isolated ions is evolved when the ionic compound is formed.

Answer: covalent bonds

Explanation:

Answer:

4 mol B

Explanation:

Step 1: Write the balanced generic equation

2 A + 4 B → 2 C

Step 2: Establish the appropriate molar ratio

According to the balanced equation, the molar ratio of B to C is 4:2.

Step 3: Calculate the moles of B needed to produce 2 moles of C

2 mol C × 4 mol B/2 mol C = 4 mol B

Answer:

I think it's b

Explanation:

Answer:

D

Explanation:

Answer:

a. The reaction is endothermic.

Explanation:

The heat involved in a chemical reaction is given by the enthalpy change (ΔH), which is equal to the balance between the chemical bonds that are broken (release energy) and the chemical bonds that are formed (need energy):

ΔH ≅ bonds broken - bonds formed

If broken bonds > bonds formed ⇒ ΔH > 0 ⇒ endothermic reaction

Therefore, the reaction is endothermic (it requires energy).

Answer:

A. 4.5 mol Mg(OH)₂

B. 6 mol NaOH

Explanation:

Let's consider the following balanced equation.

Mg(NO₃)₂ + 2 NaOH ⇒ Mg(OH)₂ + 2 NaNO₃

PART A

The molar ratio of NaOH to Mg(OH)₂ is 2:1. The moles of Mg(OH)₂ produced from 9 moles of NaOH are:

9 mol NaOH × 1 mol Mg(OH)₂/2 mol NaOH = 4.5 mol Mg(OH)₂

PART B

The molar ratio of NaOH to NaNO₃ is 2:2. The moles of NaOH needed to produce 6 moles of NaNO₃ are:

6 mol NaNO₃ × 2 mol NaOH/2 mol NaNO₃ = 6 mol NaOH