What is the genetic material of all cells?

A)Nucleus
B)Proteins
C)Mitochondria
D)DNA

Answer:

C)Water molecules are arranged closer together when frozen than in a liquid form.

Explanation:

Ice is less dense than water. More molecules are brought closer together and need to be accommodated in a smaller area

Answer:

1: to preserve 2: save a species 3: it's just cool

Answer:

In an acid-base reaction, the base always receives the H+.

Explanation:

Answer:

Water ------> Hydrogen + Oxygen

H2O   ------> H + O2

Explanation:

Answer:

100 J of energy are needed to heat the copper from 20∘C to 80∘C .

If two solutions are separated by a semipermeable membrane with one side 1.5 M NaCl solution and other side 0.5 M KBr solution. Here water will flow from the KBr solution to the NaCl solution because of the water concentration difference.

When two solutions are separated with a semipermeable membrane, the water will flow from lower solute concentrated side to higher solute concentrated side.

Lower solute concentration means the water content will be high and that states higher water concentration.

Higher solute concentration means the water content will be low and that states low water concentration.

The water will flow from higher concentration to lower till the equilibrium where both sides the water and solute concentration is same.

In this case, the lower solute concentration is the 0.5 M KBr solution and the higher solute concentration is the 1.5 M NaCl solution.

Therefore, water will tend to flow from the KBr solution to the NaCl solution.

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Answer:rocks

Explanation:

If tadpoles are hatched in stagnant water then they have got a lower survival rate than those hatched in churned & aerated water because the sitting water is higher. Testable via experimenting with tadpoles in unique settings.

Eggs generally hatch in 2-3 weeks, however, this time varies based totally on water temperature. One egg is seen whereas the other embryos are very advanced and are probably near hatching. four. The larval degree tadpole level.

A filter-out, however, can lessen the number of water adjustments in order to be needed. The clear-out must not be so robust that it creates too much current— tadpoles are terrible swimmers. make certain the tadpoles may not be up into the clear out and that they don't should swim constantly.

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Answer:

d. 10 million years

Explanation:

These are the options for the question

Choose one answer.

a. 2.5 million years

b. 5 million years

c. 15 million years

d. 10 million years

✓half-life of the radioactive substance= 5 million years

✓ Then for every 5 million years, original radioactive given (100%) percentage is reduced by factor of 1/2.

✓ 1st 5 million year; After the first 5 million years, the original radioactive is reduced as;

(100%) × 1/2 = 50% remains

✓2nd 5 million year: At 10 millions year, the 50% remaining radioactive is reduced by factor of 1/2

(50%) × 1/2 = 25% remains

Hence, at At 10 millions years 25% of the original radioactive atoms remain

.

Answer:

10 million years

0.25 Molarity of lead nitrate aqueous solution is there when a solution of nacl is added slowly to  a solution of lead nitrate.

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The density  of plastic of length of 5 cm, width of 5 cm, and a height of 5 cm would be  1.6 gm / cm3.

In this case

The dimensions of a square chunk of plastic is 5 cm x 5 cm x 5cm.

Mass, m = 200 gm

Density =  Mass / Volume

It will form a cube. Hence, the Volume = side x side x side

So ,

d = 200 gm / 5cm x 5 cm x 5 cm

d = 1.6 gm / cm3

Hence , Density is equal to 1.6 gm / cm3.

What is density explain?

Density can be defined as the mass per unit volume. Density Symbol.

Density Formula: ρ = m/V,

where ρ is the density

m is the mass of the object and V can be defined as Volume.

What is a unit of density?

It is commonly expressed in units of grams per cubic cm.

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Answer:

2Na (s) +  Cl2 (g) -->2NaCl (s) + heat

Explanation:

The bond C-C has a higher energy than C-N because the bond C-N has 1 more unpaired electron than C-C, and unpaired electrons produce repulsion which alters the energy reducing it.

The bond C-F is the stongest because the F atom is very small, also has a very strong electronegativity and has no unpaired electrons so that makes it more stable.

The unpaired electrons in N atom, are those up and down the N atom.

Heat is added to ice at 0 °C. Explain why the temperature of the ice does not change. What does change?When heat is added to ice at 0°C, the temperature of the ice does not change. This happens because all the heat energy is used up in overcoming the intermolecular forces of attraction (hydrogen bonds) that exist between the water molecules in ice.

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The reaction can be said to be at equilibrium when the reaction rates of making products and using reactants are equal.

When the rates of the forward and reverse reactions are equal and the concentrations of the reactants and products don't change over time, a chemical reaction is said to be in equilibrium.

When the system reaches equilibrium, it is in a state of balance, which means that the concentrations of the reactants and products have not changed significantly.

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The equilibrium constant at this temperature is Kc= 4.17 x 10⁻⁶.

Since the equilibrium constant depends on the equilibrium concentration of both the reactants and the products of the chemical reaction.

Balanced reaction equation

2CH₄(g)⇌C₂H₂(g)+3H₂(g)

The initial concentration of the CH₄ = 0.093 M

The equilibrium concentration of the H = 0.017 M

Equilibrium constant = ?

Let's make the ice table

2CH₄(g) ⇌ C₂H₂(g) + 3H₂(g)

0.093 M 0 0

-2x +x +3x

0.093-2x x 0.017 M

3x = 0.017 M

Therefore, x =0.017 M /3 = 0.00567 M

Therefore, the equilibrium concentration of CH₄ =

0.093 M – 2x = 0.093 M – (2 x 0.00567 M) = 0.0817 M

Equilibrium concentration of the C₂H₄ = x = 0.00567 M

Let's write the equilibrium constant expression

Kc= [C₂H₄[H2]³/[CH₄]²

Let's put the values in the formula

Kc= [0.00567][0.017]³/[0.0817]²

Kc= 4.17 x 10⁻⁶

Therefore, the equilibrium constant is 4.17 x 10⁻⁶.

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The  name of the organic compound with structural formula of nine carbons and sixteen hydrogens  depends on different factors

The nomenclature of the organic molecule comprising nine carbons and sixteen hydrogens is determined by the arrangement of its atoms as well as the nature of the chemical bonds linking them together. Cyclononane is a circular formation of nine carbon atoms.

An organic substance belongs to a group of chemicals that have carbon atoms linked to each other and other atoms through covalent bonds, and are present in the biological cells. Organic compounds contain usual elements such as carbon, as well as hydrogen, oxygen, and nitrogen.

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To measure reaction heat under isochoric conditions, a bomb calorimeter is needed.

This device is designed to maintain a constant volume (isochoric) during the reaction, allowing for accurate measurement of reaction heat. To improve the accuracy of the coffee cup calorimeter for measuring reaction heat under isobaric conditions, a modification that could be made is to use a stirring device to ensure uniform mixing of the reactants and to minimize heat loss to the surroundings.

Additionally, a lid with a small hole could be placed over the top of the calorimeter to prevent heat loss while still allowing for pressure equalization. These modifications would help to minimize errors in heat measurement and improve the accuracy of the results obtained.

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Answer:

a base

Explanation:

Answer:

D,B

Explanation:

there are 79 elements in gold

Answer: 0.85 hertz

Explanation: Calculator said so also 0.85 is decimal form for 85

Answer:

1. CaO + H₂O ----> Ca(OH)₂

Compound ----- Compound

2. 2 Na + Cl₂ ----> 2 NaCl

Element ----- Element

3. 2 SO₂ + O₂ ----> 2 SO₃

Element ----- Compound

The balanced equation is:

Zn + 2HCl ---> ZnCl2 + H2

A 1.60 g calcium supplement that contains 37.8% Ca by mass, contains 1.51 g of CaCO₃.

We want to calculate the mass of CaCO₃ in a 1.60 g supplement. We need to consider the following relationships.

\(1.60gSup \times \frac{37.8gCa}{100gSup} \times \frac{1molCa}{40.08gCa} \times \frac{1molCaCO_3}{1molCa} \times \frac{100.09gCaCO_3}{1molCaCO_3} = 1.51gCaCO_3\)

A 1.60 g calcium supplement that contains 37.8% Ca by mass, contains 1.51 g of CaCO₃.

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A 1.60 g calcium supplement contains 37.8% Ca by mass. The calcium is present in the supplement as CaCO₃(s) (molar mass 100.09 g/mol). How many grams of CaCO₃(s) are in the calcium supplement?

Answer:

mass of X extracted from the aqueous solution by 50 cm³ of ethoxy ethane = 3.33 g

Explanation:

The partition coefficient of X between ethoxy ethane (ether) and water, K is given by the formula

K = concentration of X in ether/concentration of X in water

Partition coefficient, K(X) between ethoxy ethane and water = 40

Concentration of X in ether = mass(g)/volume(dm³)

Mass of X in ether = m g

Volume of ether = 50/1000 dm³ = 0.05 dm³

Concentration of X in ether = (m/0.05) g/dm³

Concentration of X in water = mass(g)/volume(dm³)

Mass of X in water left after extraction with ether = (5 - m) g

Volume of water = 1 dm³

Concentration of X in water = (5 - m/1) g/dm³

Using K = concentration of X in ether/concentration of X in water;

40 = (m/0.05)/(5 - m)

(m/0.05) = 40 × (5 - m)

(m/0.05) = 200 - 40m

m = 0.05 × (200 - 40m)

m = 10 - 2m

3m = 10

m = 10/3

m = 3.33 g of X

Therefore, mass of X extracted from the aqueous solution by 50 cm³ of ethoxy ethane = 3.33 g

The difference in the number of cations and anions in the given mixture is approximately 0.0005 mol.

The molar mass of Na2SO4 (sodium sulfate) can be calculated as follows:

2(Na) + 1(S) + 4(O) = 2(22.99 g/mol) + 32.07 g/mol + 4(16.00 g/mol) = 142.04 g/mol

The number of moles of Na2SO4 :

moles of Na2SO4 = mass of Na2SO4 / molar mass of Na2SO4

moles of Na2SO4 = 1.49 g / 142.04 g/mol ≈ 0.0105 mol

Similarly, the molar mass of Al2(SO4)3 (aluminum sulfate) :

2(Al) + 3(S) + 12(O) = 2(26.98 g/mol) + 3(32.07 g/mol) + 12(16.00 g/mol) = 342.15 g/mol

The number of moles of Al2(SO4)3:

moles of Al2(SO4)3 = mass of Al2(SO4)3 / molar mass of Al2(SO4)3

moles of Al2(SO4)3 = 3.42 g / 342.15 g/mol ≈ 0.0100 mol

For Na2SO4, the ratio of cations (Na+) to anions (SO42-) is 2:1. So, the number of cations in 0.0105 mol of Na2SO4 is 2 * 0.0105 mol = 0.0210 mol, and the number of anions is 0.0105 mol.

For Al2(SO4)3, the ratio of cations (Al3+) to anions (SO42-) is 2:3. So, the number of cations in 0.0100 mol of Al2(SO4)3 is 2 * 0.0100 mol = 0.0200 mol, and the number of anions is 3 * 0.0100 mol = 0.0300 mol.

Calculating the difference in the number of cations and anions:

Difference = (Number of Cations in Na2SO4 + Number of Cations in Al2(SO4)3) - (Number of Anions in Na2SO4 + Number of Anions in Al2(SO4)3)

Difference = (0.0210 mol + 0.0200 mol) - (0.0105 mol + 0.0300 mol)

Difference = 0.0410 mol - 0.0405 mol

Difference ≈ 0.0005 mol

Therefore, the difference in the number of cations and anions in the given mixture is approximately 0.0005 mol.

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