If a sample has 25% parent and 75% daughter, how many halflifes have gone by?

Answer:

Element

Explanation:

since electron,neutron,and proton are inside of an atom, the answer would be elements, since elements are made up of atoms, but not present in the atom itself.

Answer:

b

Explanation:

Answer:

B) compound

A chemical formula is a compound of different chemicals.

Final answer:

A substance with a chemical formula is typically a compound since it is made up of two or more elements in a fixed ratio. An organic compound, in the case of containing covalently-bonded carbon and hydrogen, differs from an atom which is the simplest indivisible chemical substance.

Explanation:

Given a chemical formula, a substance is most likely classified as a compound. Compounds are substances that result from the combination of two or more elements in a fixed ratio. For example, water (H₂O) is a compound composed of two elements, hydrogen and oxygen, combined in a constant ratio. Here is a step-by-step approach to classifying a substance:

Identify the molecule by the provided chemical formula.

Write the molecular formula.

Determine if the molecule is a covalent, ionic or metallic substance based on the types of bonds present.

In the body, any substance that contains covalently-bonded carbon and hydrogen is classified as an organic compound. The term 'atom' applies to the simplest chemical substances that cannot be broken down chemically into a simpler substance. Therefore, the correct answer to the question is that based on the chemical formula, the substance is most likely a compound.

Answer: Volume and temperature

Explanation:

Answer:

volume and temperature

Explanation:

Answer : A light year is approximately 9.5 trillion kilometers - A)

Answer:

the answer is A) 9.5 trillion kilometers

Explanation:i got you ny g m

Answer:

0.4167 J/°C.g.

Explanation:

Q = m.c.ΔT,

where, Q is the amount of heat absorbed by substance (Q = 2500 J).

m is the mass of the substance (m = 100 g).

c is the specific heat of the substance (c = ??? J/°C.g).

ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = 70°C - 10°C = 60°C).

∵ Q = m.c.ΔT

∴ c = Q/(m.ΔT) = (2500 J)/(100 g)(60°C) = 0.4167 J/°C.g.

The study of the chemical and bond is called chemistry. According to the law of thermodynamics, the heat transfer from the high temperature to the low temperature.

The correct answer to the question is 0.4167.

To solve this problem, we can use the relation:

Q = m.c.ΔT,

where,

Q = m.c.T

After the equation, we can get.

c = [tex]\frac{Q}{(m.T)} = \frac{(2500 J)}{(100 g)(60C)}\\ \\ = 0.4167[/tex]

Hence, the correct answer is 0.4167.

For more information about the heat, refer to the link:-

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Answer:

[tex]\boxed{2.23 \times 10^{3} \text{ L}}[/tex]

Explanation:

The pressure is constant, so we can use Charles' Law.

[tex]\dfrac{ V_{1} }{T_{1}} = \dfrac{ V_{2} }{T_{2}}[/tex]

Data:

V₁ = 1.92 × 10³ L; T₁ = 20 °C  

V₂ = ?;                 T₂ = 68 °C

Calculations:

(a) Convert temperatures to kelvins

T₁ = (20 + 273.15) K = 293.15 K

T₂ = (68 + 273.15) K = 341.15 K

(b) Calculate the volume

[tex]\dfrac{ 1.92 \times 10^{3}}{293.15} = \dfrac{ V_{2}}{341.15}\\\\6.550 = \dfrac{ V_{2}}{341.15}\\\\V_{2} = 6.550 \times 341.15 = 2.23 \times 10^{3} \text{ L}[/tex]

The new volume of the gas is [tex]\boxed{2.23 \times 10^{3} \text{ L}}[/tex].

Answer:

16.82 L.

Explanation:

where, P is the pressure of the gas in atm (P = 1.0 atm, STP conditions).

V is the volume of the gas in L (V = ??? L).

n is the no. of moles of the gas in mol (n = mass/molar mass = (12.0 g)/(15.99 g/mol) = 0.7505 mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 0.0°C + 273 = 273.0 K, STP conditions).

∴ V = nRT/P = (0.7505 mol)(0.0821 L.atm/mol.K)(273.0 K)/(1.0 atm) = 16.82 L.

Answer:

Soil

Explanation:

Overcrowding is not considered as environmental effect of deforestation.

Trees provide various advantages to the living beings. It acts as shelter to animal, birds and human beings. It provides various raw materials for the industry. Apart from this it checks the flooding, prevents soil erosion and protects the environment from smog formation.  

Deforestation refers to the process in which many trees are uprooted and destroyed. When trees are harmed it leads to stoppage of advantage caused by them. Overcrowding is not considered as environmental effect of deforestation as it has no relationship with deforestation.

13.5 Moles Kcl x 6.022 x 10^23 /1

= 8.12 x 10^24

whenever you need to find molecules just multiply moles by avogadro number

Search it up pppppp pp pp

The reaction 4NO(g) → 2N2(g) + 2O2(g) is exothermic because the reverse process consumes energy.

The chemical reaction 4NO(g) → 2N2(g) + 2O2(g) is being asked if it is endothermic or exothermic. Based on the information provided, we can infer that the reverse process, forming 2NO(g) from N2(g) and O2(g), requires the input of 181 kJ of energy. Therefore, the reaction where 4NO(g) decomposes into 2N2(g) and 2O2(g) would release that energy, indicating that the reaction is exothermic.

This is supported by similar reactions listed, such as N2(g) + O2(g) + 45 kcal → 2NO(g) and N2O2(g) → 2 NO2(g), which are both endothermic requiring heat; hence their reverse reactions would be exothermic as they release heat

Answer:

1.  C.  distillation

2.  B.  conversion of mechanical energy into nuclear energy

3.  B.  Alpha ray

Explanation:

Hello There!

South of the equator, some crops grown were beans, cotton, peanuts, peppers, potatoes, coffee, millet and yams

Answer:

Its B. Just look at google.

Answer:

The number of protons and neutrons in an atom is known as the mass number. C.)

Answer:

The number and the kinds of atoms in the compound

Explanation:

E is the correct answer because both endothermic and exothermic reactions require activation energy. the reactants have less potential energy than do the products. Energy must be input in order to raise the particles up to the higher energy level.

Answer:

C. Forming the activated complex requires energy,

Explanation:

For any reaction (whether exothermic or endothermic) the reactant molecules need some minimum amount of energy known as Threshold energy.

Reactant molecules have some internal energy and they require some extra amount of energy to reach the threshold energy which is known as activation energy.

This activation energy is required to from an activated complex.

The activated complex is formed where reactant molecules come closer to each other and undergo effective collision. This causes the formation of products.

Answer:

A solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

Explanation:

Solids that have a regular and three-dimensional arrangement of constituent particles such as (atoms, molecules, or ions) are known as crystalline solids. A few examples of crystalline solids include sodium chloride, quartz, diamond, etc. There are four types of crystals:

In crystalline solids, particles are arranged in a repeating pattern. They have a regular and ordered arrangement resulting in a definite shape.

Find more information about Crystalline solid here:

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Answer:

Solar eclipse

Explanation:

Answer:

A

Explanation:

Answer:

A) standard heat of formation

Explanation:

The new pressure of helium gas assuming constant temperature is equal to 1610.26 Torr.

Given the following data:

Conversion:

Initial volume = 235 mL to L = [tex]\frac{235}{1000} = 0.235\;L[/tex]

To determine the new pressure assuming constant temperature, we would apply Boyle's law:

Mathematically, Boyle's law is given by the formula;

[tex]PV = k\\\\P_1V_1 = P_2V_2[/tex]

Where;

Substituting the given parameters into the formula, we have;

[tex]788\times 0.235 = P_2 \times 0.115\\\\185.18 = 0.115P_2\\\\P_2 = \frac{185.18}{0.115} \\\\P_2 =1610.26\; Torr[/tex]

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The new pressure assuming constant temperature would be 1610.43 torr.

Given values:

Goal: Find the new pressure (P₂) in torr.

Ideal Gas Law:

Therefore, the new pressure assuming constant temperature would be 1610.43 torr.

Answer:

0.0250 g.

Explanation:

∵ no. of moles (n) = mass / molar mass.

∴ mass of Vitamine C = (n)(molar mass) = (0.000142 mol)(176.12 g/mol) = 0.02501 g = 0.0250 g. "three significant figures"

Answer:

Water is a compound made up of two elements—hydrogen and oxygen. ... They are both colorless, odorless gases , and they both readily react with other elements—making them "reactive" elements. But in many ways they are very different from each other. Hydrogen has the lowest density of all the elements.

Answer:

Explanation:

The properties of covalent bonds are:

1. Low boiling points and melting points.

2. Various colors.

3. Poor conductors of heat and electricity.

4. Brittle solids.

Covalent compounds form through the combination of two non-metals that share electrons. These compounds have low melting and boiling points and do not conduct electricity due to lack of free ions.

A property of covalent compounds is that they are typically formed when two non-metals combine, resulting in the sharing of electrons between atoms. This shared electron pair is known as a covalent bond. Another important property is that covalent compounds have low melting and boiling points compared to ionic compounds because they do not have charged ions, so the forces between molecules are weaker. Covalent compounds also don't conduct electricity as there aren't many free ions to carry charge.

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A. heat; light energies

Answer:

the answer is A; firstly heat then heat light.

Answer:

Explanation:

Hydrogen is a nonmetallic, colorless gas under ordinary conditions. It becomes an alkali metal under extreme pressure.

Atomic Number: 1

Symbol: H

Atomic Mass: 1.008

Electron Configuration: 1s1

Group: group 1, s-block, nonmetal

Helium is a light, colorless gas that forms a colorless liquid.

Atomic Number: 2

Symbol: He

Atomic Mass: 4.002602(2)

Electron Configuration: 1s2

Group: group 18, s-block, noble gas

Lithium is a reactive silver metal.

Atomic Number: 3

Symbol: Li

Atomic Mass: 6.94 (6.938–6.997)

Electron Configuration: [He] 2s1

Group: group 1, s-block, alkali metal

Beryllium is a shiny gray-white metal.

Atomic Number: 4

Symbol: Be

Atomic Mass: 9.0121831(5)

Electron Configuration: [He] 2s2

Group: group 2, s-block, alkaline earth metal

Boron is a gray solid with a metallic luster.

Atomic Number: 5

Symbol: B

Atomic Mass: 10.81 (10.806–10.821)

Electron Configuration: [He] 2s2 2p1

Group: group 13, p-block, metalloid

Carbon takes several forms. It's usually a gray or black solid, although diamonds may be colorless.

Atomic Number: 6

Symbol: C

Atomic Mass: 12.011 (12.0096–12.0116)

Electron Configuration: [He] 2s2 2p2

Group: group 14, p-block, usually a nonmetal although sometimes considered a metalloid

Nitrogen is a colorless gas under ordinary conditions. It cools to form a colorless liquid and solid forms.

Atomic Number: 7

Symbol: N

Atomic Mass: 14.007

Electron Configuration: [He] 2s​2 2p3

Group: group 15 (pnictogens), p-block, nonmetal

Oxygen is a colorless gas. Its liquid is blue. Solid oxygen may be any of several colors, including red, black, and metallic.

Atomic Number: 8

Symbol: O

Atomic Mass: 15.999 or 16.00

Electron Configuration: [He] 2s2 2p4

Group: group 16 (chalcogens), p-block, nonmetal

Fluorine is a pale yellow gas and liquid and bright yellow solid. The solid may be either opaque or translucent.

Atomic Number: 9

Symbol: F

Atomic Mass: 18.998403163(6)

Electron Configuration: [He] 2s2 2p5

Group: group 17, p-block, halogen

Neon is a colorless gas that emits a characteristic orange-red glow when excited in an electric field.

Atomic Number: 10

Symbol: Ne

Atomic Mass: 20.1797(6)

Electron Configuration: [He] 2s2 2p6

Group: group 18, p-block, noble gas

Sodium is a soft, silvery-white metal.

Atomic Number: 11

Symbol: Na

Atomic Mass: 22.98976928(2)

Electron Configuration: [Ne] 3s1

Group: group 1, s-block, alkali metal

Magnesium is a shiny gray metal.

Atomic Number: 12

Symbol: Mg

Atomic Mass: 24.305

Electron Configuration: [Ne] 3s2

Group: group 2, s-block, alkaline earth metal

Aluminum is a soft, silver-colored, nonmagnetic metal.

Atomic Number: 13

Symbol: Al

Atomic Mass: 26.9815385(7)

Electron Configuration: [Ne] 3s2 3p1

Group: group 13, p-block, considered a post-transition metal or sometimes a metalloid

Silicon is a hard, blue-gray crystalline solid that has a metallic luster.

Atomic Number: 14

Symbol: Si

Atomic Mass: 28.085

Electron Configuration: [Ne] 3s2 3p2

Group: group 14 (carbon group), p-block, metalloid

Phosphorus is a solid under ordinary conditions, but it takes several forms. The most common are white phosphorus and red phosphorus.

Atomic Number: 15

Symbol: P

Atomic Mass: 30.973761998(5)

Electron Configuration: [Ne] 3s2 3p3

Group: group 15 (pnictogens), p-block, usually considered a nonmetal, but sometimes a metalloid

Sulfur is a yellow solid.

Atomic Number: 16

Symbol: S

Atomic Mass: 32.06

Electron Configuration: [Ne] 3s2 3p4

Group: group 16 (chalcogens), p-block, nonmetal

Chlorine is a pale yellow-green gas under ordinary conditions. Its liquid form is bright yellow.

Atomic Number: 17

Symbol: Cl

Atomic Mass: 35.45

Electron Configuration: [Ne] 3s2 3p5

Group: group 17, p-block, halogen

Argon is a colorless gas, liquid, and solid. It emits a bright lilac-purple glow when excited in an electric field.

Atomic Number: 18

Symbol: Ar

Atomic Mass: 39.948(1)

Electron Configuration: [Ne] 3s2 3p6

Group: group 18, p-block, noble gas

Potassium is a reactive, silvery metal.

Atomic Number: 19

Symbol: K

Atomic Mass: 39.0983(1)

Electron Configuration: [Ar] 4s1

Group: group 1, s-block, alkali metal

Calcium is a dull silver metal with a faint yellowish cast.

Atomic Number: 20

Symbol: Ca

Atomic Mass: 40.078(4)

Electron Configuration: [Ar] 4s2

Group: group 2, s-block, alkaline earth metal

Hope That Helps!

Brainliest?

(the other person copied it from Google).

Answer:

= 5.193 g

Explanation:

Half life is the time taken by a radioactive element to decay by half its original amount. Therefore, since half life of carbon-14 is 5700 years, then it would take 5700 years for a sample of carbon-14 to decay by half of its original amount.

Using the formula;

New mass = Original mass × (1/2)^n, where n is the number of half lives.

n = Period taken/Half life = 6350 years/5700 years =1.114

Therefore;

New mass = 11.24 × (1/2)^1.114

                 = 5.193 g

Hence, a mass of 5.193 g of Carbon-14 would remain after 6350 years.

After one half-life of 5700 years, half of the initial amount carbon-14 in the organism would remain, which is 5.62g. The time period of 6350 years is more than one half-life so we know the amount of carbon-14 left will be less than 5.62g.

The question requires us to calculate how much carbon-14 will remain in an organism after 6350 years, given that it had 11.24g at the time of its death and the half-life of carbon-14 is 5700 years. This is a question of radioactive decay and can be solved using the concept of half-lives. Knowing the half-life of a radioactive isotope means knowing how long it typically takes for half of that isotope to decay.

After one half-life (5700 years), half of the initial carbon-14 in the organism would remain, so after that time, the organism would have 11.24g / 2 = 5.62g of carbon-14 left. The requested time period of 6350 years is more than one half-life but less than two. As radioactive decay is a random process, we can't say exactly how much will remain at this time, but we know it will be less than 5.62g and more than half of that again.

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Answer:

55.3 g / 100.0 g of water.

Explanation:

The theoretical value is 55.3 g.

Answer:

Hi! I hope this will help

you with your question, whether this is an assignment or not. The answer that I

get is 0.033 concentration.

If 0.0025 mol NaNo3 forms

during the reaction, the concentration of NaNO3 in the final solution should be

0.033.

The concentration of NaNO₃ in the final solution, considering the sum of the given volumes, is approximately 0.276 M.

To find the concentration of NaNO₃ in the final solution, we need to know the volume of the solution. However, since it's not provided in the question or the additional information, we'll assume that the final volume of the solution is the sum of the volumes given in the reference information (0.2L from Na+ and 50mL + 40mL for NO₃).

Step 1: Convert mL to Liters for NO₃ since the concentrations are in Molarity (moles/liter). Therefore, the total volume in liters is 0.2L + 0.05L + 0.04L = 0.29L.

Step 2: We know from the information given that 0.08 mol of NaNO3 is produced. Since this is less than the stated 0.0025 mol, we will use 0.08 mol as the correct value.

Step 3: Calculate the concentration in moles/Liter (Molarity) using the formula C = n/V, where 'C' is concentration, 'n' is the number of moles, and 'V' is the volume in liters. This gives us C = 0.08 mol / 0.29 L = approx 0.276 M NaNO₃.

The concentration of NaNO₃ in the final solution is approximately 0.276 M.

Answer:

C. Protons and neutrons. They are located in the nucleus f an atom while the electrons orbit the nucleus.

Answer:

pH = 2.0

Explanation:

To find the pH of a solution, take the -log[H+]. In this case, the -log(9.4 x 10^-3) equals 2.02687 which makes 2.0 when accounting for significant figures.

Answer:

The right choice is "wind power requires a lot of space and depends on local weather patterns "

Explanation:

    2. geothermal power requires more land than other power plants  

    3. nuclear power produces small amounts of energy from large masses

So the right choice is "wind power requires a lot of space and depends on local weather patterns "