Nikki giovanni says that "we need confidence in our knowledge of who we are." who is 'we?" who
is she speaking to?

The estimated age of the sample is approximately 10,717 years.

To estimate the age of the sample, we can use the formula for exponential decay:

\(N(t) = N(0) * (1/2)^(t / T)\)

Where:
N(t) is the current radioactivity (5.4 disintegrations per minute per gram)
N(0) is the original radioactivity (15.3 disintegrations per minute per gram)
t is the time passed (unknown)
T is the half-life of carbon-14 (5,730 years)

Substituting the given values, we have:

\(5.4 = 15.3 * (1/2)^(t / 5730)\)

To solve for t, we need to isolate it. Divide both sides of the equation by 15.3:

\(5.4 / 15.3 = (1/2)^(t / 5730)\)

\(0.3529 = (1/2)^(t / 5730)\)

Next, take the logarithm of both sides to get t / 5730 by itself:

\(log(0.3529) = log((1/2)^(t / 5730))\)

Using the logarithmic property, we can bring down the exponent:

\(log(0.3529) = (t / 5730) * log(1/2)\)

Simplify further:

\(log(0.3529) = (t / 5730) * (-0.3010)\)

Divide both sides by -0.3010:

\(log(0.3529) / -0.3010 = t / 5730\)

Solve for t by multiplying both sides by 5730:

\(t = log(0.3529) / -0.3010 * 5730\)

Using a calculator, we find:

t ≈ 10,717 years

Therefore, the estimated age of the sample is approximately 10,717 years.

To know more about age visit-

https://brainly.com/question/30512931

#SPJ11

Answer:

For every force one object applies on another, there

is an equal force applied in the opposite direction.

Explanation:

please mark brainliest here

Answer: A The total mass of the reactants must equal the total mass of the products.

Explanation:

Yes, in qualitative anion analysis, there is a specific order that is commonly followed to systematically identify and separate different anions present in a given sample.

Yes, in qualitative anion analysis, there is a specific order that is commonly followed to systematically identify and separate different anions present in a given sample. This order is known as the systematic scheme or the systematic qualitative analysis.

The systematic scheme generally begins with the preliminary tests to determine the presence of certain groups of anions based on their characteristic reactions. These preliminary tests help in narrowing down the possibilities and guide the subsequent steps.

Following the preliminary tests, the anions are typically separated into groups based on their behavior in specific reagents or precipitating agents. Each group of anions is then subjected to specific confirmatory tests to identify the presence of particular anions within that group. The separation and identification process continues with subsequent groups until all relevant anions have been identified or excluded.

The specific order of the systematic scheme may vary slightly depending on the analytical method or the specific laboratory protocols being followed, but the overall goal remains the same: to systematically identify and separate anions in a logical and efficient manner.

For more question on anions

https://brainly.com/question/14309645

#SPJ8

Answer:

(D)=1.16g

Explanation:

Answer:

D) 1.16 g

I'm not sure about answer ..

The material that is not a colloid is glue. Option A is correct.

Glue is typically a viscous liquid or adhesive that is not composed of dispersed particles within a continuous medium, which is the defining characteristic of a colloid. Instead, glue is typically a solution or a mixture of substances that form a solid or semi-solid adhesive when it dries. Colloids, on the other hand, consist of small particles dispersed in a different medium, such as a liquid, gas, or solid.

However, smoke, paint, and aerosol spray are examples of colloids. Smoke consists of tiny solid or liquid particles dispersed in air. Paint is typically a suspension of solid pigment particles in a liquid medium. Aerosol sprays contain small liquid or solid particles dispersed in a gas or liquid propellant.

Hence, A. is the correct option.

To know more about colloid here

https://brainly.com/question/29667002

#SPJ4

None of the materials listed (glue, smoke, paint, and aerosol spray) are not colloids. They are all examples of colloids.

In order to identify the material that is not a colloid, let's examine each option:

Based on the characteristics of each option, we can conclude that none of the materials listed are not colloids. All of the options mentioned (glue, smoke, paint, and aerosol spray) are examples of colloids.

About materials here:

https://brainly.com/question/30514977

#SPJ11

Answer:

I feel like it will boil at 100 and up

Explanation:

For the following solutions:

Acidic, basic, and neutral are terms used to describe the pH (power of hydrogen) of a solution.

pH is a measure of the concentration of hydrogen ions (H+) in a solution, with lower pH values indicating higher concentrations of H+ (acidic), higher pH values indicating lower concentrations of H+ (basic), and pH 7 indicating equal concentrations of H+ and hydroxide ions (OH-) (neutral).

Find out more on acidic here: https://brainly.com/question/24255408

#SPJ1

The mass of carbon dioxide released during the reaction is 2.6 grams.

To determine the mass of carbon dioxide released during the reaction between sodium hydrogen carbonate (NaHCO3) and acetic acid (CH3COOH), we need to calculate the difference in mass before and after the reaction.

Before the reaction:

Mass of NaHCO3 = 3.8 g

Mass of acetic acid = 10.5 g

Total mass before the reaction = Mass of NaHCO3 + Mass of acetic acid = 3.8 g + 10.5 g = 14.3 g

After the reaction:

Mass of the contents of the reaction vessel = 11.7 g

To find the mass of carbon dioxide released, we calculate the difference in mass:

Mass of carbon dioxide released = Total mass before the reaction - Mass of the contents of the reaction vessel

= 14.3 g - 11.7 g

= 2.6 g

Therefore, the mass of carbon dioxide released during the reaction is 2.6 grams.

learn more about carbon dioxide here

https://brainly.com/question/3049557

#SPJ11

Answer:

The image does not work

Explanation:

The percent by mass of acetic acid in the vinegar is 2.33%.

Below are the steps to solve the given problem using the data table given below:

Step 1: Calculate the mass of the vinegar. Given,Mass of flask and vinegar solution- 25.17gMass of flask- 15.12gMass of vinegar solution = Mass of flask and vinegar solution - Mass of flask= 25.17 g - 15.12 g= 10.05 g

Step 2: Calculate the moles of NaOH used in the titration.Molarity of NaOH solution is 0.1 M.Moles of NaOH = Molarity × Volume of NaOH usedMoles of NaOH = 0.1 M × 39.00 mL (since the initial volume of NaOH is 0.00 mL)Moles of NaOH = 0.0039 moles

Step 3: Determine the moles of acetic acid used in the reaction.The balanced chemical equation for the reaction between NaOH and acetic acid (the main component of vinegar) is given below:CH3COOH + NaOH → CH3COONa + H2OMoles of NaOH = Moles of CH3COOH (since they react in a 1:1 ratio)Moles of CH3COOH = 0.0039 moles

Step 4: Calculate the mass of acetic acid used in the reaction.Molar mass of acetic acid is 60.05 g/mol.Mass of CH3COOH = Moles of CH3COOH × Molar mass of CH3COOH= 0.0039 moles × 60.05 g/mol= 0.234 gStep 5: Calculate the percent by mass of acetic acid in the vinegar.Percent by mass of acetic acid = (Mass of CH3COOH / Mass of vinegar solution) × 100%= (0.234 g / 10.05 g) × 100%= 2.33%.

for such more questions on mass

https://brainly.com/question/24191825

#SPJ8

Answer:

the sun would reflect off of the windows causing less heat to travel into the building

Explanation:

Answer:

The answer is B - At dynamic equilibrium, the reactions continue but the amounts of reactants and products do not change.

Explanation:

got it right on Edge

Answer:

the difference between perceive and observe  is that perceive is to see, to be aware of, to understand while observe is to notice or view, especially carefully or with attention to detail.

Explanation:

The correct answer is by working in tandem in a symbiotic manner.

Agouti, a tiny rodent, and the Brazil nut tree are interdependent in the Amazon rainforest. The Brazil nut tree drops its ripe pods to the ground, but if it weren't for the agouti's razor-sharp teeth, the pods wouldn't be broken open. The only animal in the forest that has the propensity to separate pods is the agouti. The agouti benefits from eating the Brazil nuts; in exchange, the agoutis bury and conceal the extra nuts; many of these nuts assume the shape of roots and replenish the Brazil nut trees' supplies. Brazil nut trees appear to only bear fruit in undisturbed forests and are vulnerable to deforestation. They rely on other plants in the rainforest, agoutis for seed dissemination, bees for pollination, and other animals to survive. The Brazil nut tree will also vanish if these other species do.

Learn more about Agouti here:-

https://brainly.com/question/17080176

#SPJ4

Answer:

Agouti is the only animal found in the forest that possesses the tendency to split the pods. The agouti gets benefit by consuming the Brazil nuts, and in return, the agoutis bury and hide the extra nuts, and of these nuts, many of them take the form of a root and reload the stocks of Brazil.

Explanation:

edge 22

It is accurate to say that Kentucky bluegrass is more heat-resistant than annual bluegrass.

All the cool-season grasses typical of northern lawns offer some degree of cold endurance, but Kentucky bluegrass is the most resilient, enduring the bitter winter temperatures. Excellent cold tolerance is another quality of fine fescue. Compared to Kentucky bluegrass, creeping bentgrass is more resistant to submersion. In general, cool-season turfgrasses are more tolerant to shade than warm-season turfgrasses. The Augustinegrass is the most tolerant of shade. Of all maintained turfgrasses, bermudagrass requires the most light, followed by carpetgrass, bahiagrass, zoysiagrass, centipedegrass, Kentucky bluegrass, tall fescue, and red fescue. Although centipedegrass is marginally more cold tolerant than St. Augustine grass, prolonged exposure to temperatures of 5°F or lower can cause centipedegrass to die.

Learn more about turfgrasses from here:

https://brainly.com/question/30410479

#SPJ4

Answer:

Last option is the correct choice.

Explanation:

Number of protons = 60-33 = 27

Superscript 60 Subscript 27 upper C o.

Best Regards!

yeah, its D. 60/27Co

Answer:

7 O2

Explanation:

My method involves counting all the elements in the equation. There must be an equal amount of each on both sides. Because it's asking for O2 only, look for compounds that deal with O2

So...CO2 and H2O only on the product side for this chemical equation.

Count the total O there is

CO2 has 2 O in one molecule, so 4 CO2 molecule is 8 Oxygen

H2O has 1 O in one molecule, so 6 H2O molecule is 6 Oxygen.

Your total O on the product side is 14

On the reactant side, the O2 is paired because O2 likes to be stable, so one O2 molecule has 2 O. This means that 2x = 14, which is 7.

Your answer is 7

Answer:

7 O2

Explanation:

You are given the balanced equation 2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(ℓ) You are given rules for assigning oxidation numbers in Table 9.3 on page 604 of the student textbook. Compare the oxidation numbers of the atoms of each element on both sides of the equation. ... Therefore, the reaction is a redox reaction.

For preparing a NaCl solution with a total volume of 50 ml, the best glassware to use would be a graduated cylinder.

Graduated cylinders are designed with clear and precise volume markings along their sides, allowing for accurate measurements of liquids.

With a 50 ml target volume, a graduated cylinder provides the necessary precision for measuring and mixing the correct amount of NaCl and solvent (usually water).

This glassware minimizes measurement errors and ensures the desired concentration of the solution. Its straightforward design and ease of use make the graduated cylinder a practical choice for small-volume solution preparation tasks.

Know more about graduated cylinder:

https://brainly.com/question/33943611

#SPJ12

Answer:; 66 g is about 3/2 the value of the molar mass of CO2. It is reasonable that the sample contains 3/2 (1.5) mol.

Explanation:

Answer:

65°C

Explanation:

Formula for calorimetry is:

Q = C . m . ΔT

Where Q is heat, C is specific heat, m is mass and ΔT is the difference between final T° and initial.

We have all data to replace.

First of all, we convert kJ to J → 4.94 kJ . 1000 J / 1 kJ = 4940 Joules

We made this conversion because the unit of C, is in J

As heat is lost, we have to think in a negative value. Let's replace:

- 4940 J = 4.18 J/ g °C . 35 g . ( Final T° - 98.8°C)

- 4940 J / (4.18 J/ g °C . 35 g) =  Final T° - 98.8°C

Final T° = - 4940 J / (4.18 J/ g °C . 35 g) + 98.8°C

Final T° = 65.03 °C

Notice, that this answer has sense because as T° decreased, heat has been lost.

Answer:

A

Explanation:

hes higher up so the gravity is his advantage.

The total pressure of the wet gas mixture is \(78.5 kPa.\)

Water vapour is another component of the wet gas mixture, but it is not taken into account in the formula above because it has no impact on the overall pressure. When liquid water is heated to the point of evaporation, it turns into the gas known as water vapour. Its partial pressure is influenced by the temperature and relative humidity of the atmosphere and is mostly made up of hydrogen and oxygen. Because of this, the total pressure of the wet gas combination is calculated without taking into account water vapour.This is calculated by adding the partial pressures of nitrogen (53.0 kPa) and helium (25.5 kPa). Mathematically, this is represented as

\(Ptotal = Pnitrogen + Phelium \\\\ = 53.0 + 25.5\\\\ = 78.5 kPa.\)

Therefore,The total pressure of the wet gas mixture is \(78.5 kPa.\)

learn more anout wet gas Refer:brainly.com/question/14356335

#SPJ4

The periodic table is organized into groups (vertical columns) and periods (horizontal rows). Elements in the same group are more likely to undergo the same kinds of reactions.

Elements within the same group have similar outer electron configurations due to their placement in the same column. This similarity in electron configuration leads to similar chemical properties and reactivity.

Elements in the same group have the same number of valence electrons, which are the electrons involved in chemical reactions. These valence electrons determine an element's ability to form bonds and participate in reactions. Therefore, elements in the same group often exhibit similar patterns of chemical reactivity and tend to undergo the same types of reactions.

In contrast, elements in the same period have different outer electron configurations, which result in varying chemical properties and reactivity. While elements in the same period may share some similarities, they are less likely to undergo the same kinds of reactions compared to elements in the same group.

To learn more about, valence electrons, click here, https://brainly.com/question/31264554

#SPJ11

The chemical formula for ozone is O₃. Hence, the correct option is e.

Ozone is a triatomic molecule composed of three oxygen atoms (O₃). It is a pale blue gas with a pungent odor. Ozone plays a vital role in both the Earth's atmosphere and in various industrial and medical applications.

The chemical formula for ozone is O₃, consisting of three oxygen atoms bonded together. Ozone is an allotrope of oxygen and is commonly known for its strong oxidative properties and its role in the ozone layer of the Earth's atmosphere.

Ozone is also generated in the lower atmosphere through various chemical reactions involving pollutants emitted by human activities. High levels of ground-level ozone can cause respiratory issues, irritate the eyes, and harm plant life.

Learn more about Ozone from the link given below.

https://brainly.com/question/27911475

#SPJ4

Answer: Ionic attractions

Explanation:

Ionic bonding is a type of chemical bond that involves the electrostatic attraction between oppositely charged ions.

Answer:

The concentration of the sodium carbonate solution is 0.0352 M (molar concentration) and 3.6712 g/L (mass concentration).

To calculate the concentration of the sodium carbonate solution, we can use the concept of stoichiometry and the volume and concentration of the hydrochloric acid (HCl) solution. The balanced chemical equation for the reaction between sodium carbonate (\(Na_2CO_3\)) and hydrochloric acid is:

\(Na_2CO_3 + 2HCl - > 2NaCl + H_2O + CO_2\)

From the equation, we can see that one mole of sodium carbonate reacts with two moles of hydrochloric acid. Since the volume of hydrochloric acid used is 22 cm^3 and its concentration is 0.04 M (moles per liter), we can calculate the number of moles of HCl used:

Moles of HCl = volume (L) x concentration (M) = 0.022 L x 0.04 M = 0.00088 moles

Since the stoichiometry of the reaction tells us that one mole of sodium carbonate reacts with two moles of hydrochloric acid, the number of moles of sodium carbonate is also 0.00088 moles.

Now, we can calculate the molar concentration of the sodium carbonate solution using the volume of the solution, which is 25 \(cm^3\)(0.025 L):

Molar concentration = moles/volume (L) = 0.00088 moles / 0.025 L = 0.0352 M

To calculate the mass concentration of the sodium carbonate solution, we need to know the molar mass of sodium carbonate, which is 105.99 g/mol. The mass concentration is given by:

Mass concentration = (moles/volume) x molar mass = (0.00088 moles / 0.025 L) x 105.99 g/mol = 3.6712 g/L

Therefore, the concentration of the sodium carbonate solution is 0.0352 M (molar concentration) and 3.6712 g/L (mass concentration).

Learn more about concentration

https://brainly.com/question/17206790

#SPJ11