how many electrons does Co2- have?

Answer:rusting is irreversible because the oxygen in the air reacts with the material and causes a chemical reaction

Explanation:

its not reversible because nothing you can do will make it bring back the material besides like rust treatment which a body shop does and they have to add material back to the spot

Answer: D. 4

Explanation:

For numbers with decimal point, we should start counting from the first number that non-zero from the left.

0.0001372

We start counting from 1, since it is the first non-zero number

1, 3, 7, 2

There are in total 4 significant figures

Hope this helps!! :)

Please let me know if you have any question or need further explanation

Answer:

Yellow

Explanation:

Thymol blue has a brownish-green or reddish-brown color and is a good pH indicator. It changes from red to yellow at a pH 1.2–2.8 ( acidic) and then from yellow to blue at a pH of 8.0–9.6( alkaline).

Nitric acid is a strong acid which means the pH indicator will change to yellow.

A sample of oxygen occupies 1.00 × 10⁶ mL at 575 mmHg. If the pressure is increased to 1.25 atm, the volume decreases to 6.06 × 10⁵ mL.

Boyle's law states that the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature.

We will use the conversion factor 1 atm = 760 mmHg.

575 mmHg × 1 atm/760 mmHg = 0.757 atm

A sample of oxygen occupies 1.00 × 10⁶ mL (V₁) at 0.757 atm (P₁).

If the pressure is increased to 1.25 atm (P₂), we can calculate the new volume (V₂) using Boyle's law.

P₁ × V₁ = P₂ × V₂

V₂ = P₁ × V₁ / P₂

V₂ = 0.757 atm × 1.00 × 10⁶ mL / 1.25 atm = 6.06 × 10⁵ mL

A sample of oxygen occupies 1.00 × 10⁶ mL at 575 mmHg. If the pressure is increased to 1.25 atm, the volume decreases to 6.06 × 10⁵ mL.

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Answer:

A. evaporation

Explanation:

Answer:

This process is called (A) evaporation.

I hope this helped at all.

Answer:

s= 0.5 at^2

0.5 x 9.81 x 3^2 = 44m

Explanation:

OB.

44 meters

Fermentation is the process that takes place when organic compounds are broken down in the absence of oxygen.

Explain the process of fermentation.

Through the activity of enzymes, fermentation is a metabolic process that results in chemical changes in organic substrates. It is specifically described in biochemistry as the process of obtaining energy from carbohydrates without the presence of oxygen.

Hence the answer is fermentation.

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The second row of the table, which deals with the equilibrium of a system, can be completed by filling in the missing information.C: Q < KeqWhen Q < Keq, the reaction will proceed in the forward direction. It means that the concentration of reactants will be higher than the concentration of products.

The forward reaction is thus favored When the forward reaction is favored, the equilibrium constant Keq is greater than the reaction quotient Q. As a result, there is an increase in the concentration of products to reactants until the Keq and Q values become equal. As a result, the reaction proceeds in the forward direction to achieve equilibrium. This case is also referred to as the reaction proceeding spontaneously in the forward direction

When Q > Keq, the concentration of the reactants is higher than the concentration of products, and the reaction is in the reverse direction. The reverse reaction is favored in this case. The reaction proceeds in the reverse direction to establish equilibrium when the concentration of products increases to that of reactants, and the Keq and Q values become equal. This case is referred to as the reaction proceeding spontaneously in the reverse direction.When Q = Keq, the reaction is at equilibrium, which means that the rate of the forward reaction is equal to the rate of the reverse reaction. As a result, the concentration of products and reactants remain constant.

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The techniques that helped these three anthropologists their work that helped them assist communities overcome debilitating health issues are:

An anthropologist is described as a person engaged in the practice of anthropology.

Anthropology is said to be the study of aspects of humans within past and present societies.

The work of anthropologists like Shirley lindenbaum, david simmons, and paul farmer serve as examples of applying anthropology to successfully address health-care problems around the world. These three anthropologists had techniques used in their work their work that helped them assist communities overcome debilitating health issues. Such techniques include:

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The correct electronic configuration of nitrogen (N) is \(1s^{2} , 2s^{2} , 2p^{3}\).

Having seven total electrons, nitrogen is the seventh element. The first two electrons will be written in the 1s orbital when writing the electronic structure for nitrogen. The following two electrons for N go in the 2s orbital since the 1s orbital can only hold two electrons. The 2p orbital will house the final three electrons. A \(1s^{2} , 2s^{2} , 2p^{3}\)electron configuration will therefore be present in the N.

Scientists may easily express how the electrons are organized around the nitrogen atom's nucleus by writing it down and using the configuration system for nitrogen (N). The interaction of atoms to generate chemical bonds is now simpler to comprehend and anticipate as a result.

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Given that the volume remains constant, the sample of oxygen gas will have a pressure of 10.67 kPa at a temperature of -62.0°C, according to the question.

The force per unit area applied to a surface is described by the fundamental physical quantity known as pressure. It is quantified in units of force like pounds per square inch (psi) or newtons per square metre (N/\(m^2\)). In addition to measuring the amount of force delivered to an area, pressure can also be used to gauge how much work a system has accomplished.

Because a gas sample's pressure and temperature are inversely correlated, when the temperature varies, so does the gas pressure. The Ideal Gas Law, which states that P*V = n*R*T, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature, describes the relationship between pressure and temperature for a certain volume of gas.

As a result, we may modify the Ideal Gas Law equation to solve for P in order to determine the pressure at -62.0°C:

P = (n*R*T) / V

P = (n*R*(-62.0 + 273.15)) / V

P = (n*R*211.15) / V

P = (6.58 kPa * 8.314 J/K·mol * 211.15 K) / V

P = 10.67 kPa

Given that the volume remains constant, the pressure of the sample of oxygen gas will be 10.67 kPa at -62.0°C.

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Element X most likely belongs to group 1 (alkali metals) of the periodic table. The reactivity of alkali metals with group 17 (halogens) is well known and follows the general equation M + X2 → MX, where M represents an alkali metal and X represents a halogen.

This reaction results in the formation of ionic compounds in which the alkali metal has a positive charge and the halogen has a negative charge. This reaction also follows the octet rule, where both the alkali metal and the halogen achieve a full outer shell of electrons.

Therefore, given the information provided, it is highly likely that Element X has only one valence electron, making it a member of group 1, and reacts with group 17 elements to form ionic compounds.

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To estimate the likelihood of a catastrophic wildfire, meteorologists utilize meteorological data. To forecast the likelihood of wildfires under several possible climatic scenarios, scientists develop computer models. Scientists forecast where and when wildfires are most likely to occur using various estimates of temperature and precipitation.

Other widely utilized technologies by many authorities and sectors to monitor and identify wildfire outbreaks include terrestrial, aerial, and satellite remote sensing systems as well as IoT-based solutions. To actively search the terrain for fresh flames, terrestrial camera systems have been implemented in numerous areas.

Even though it is not always feasible to identify the particular cause or spark of a fire occurrence, wildfire risk may be roughly calculated by comprehending how climate, geography, weather, and land cover affect fire behavior and the possibility of a fire spreading.

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Answer:

Information collected during an

experiment = 2 data

Testable explanations that have not

been proven but have evidence to

back the claim = 3 theory

Based on facts that have been

proven and there is evidence and

results to support the proof.

f. = 4 law

Test done to prove the hypothesis

correct or incorrect should always

be done more than once to ensure

accurate results. = 1 experiment

Explanation:

Answer:

Al and Hcl

Explanation:

Reactants are the elements, compounds etc before the arrow

Answer:

Carbohydrates can be divided into two main types: simple and complex. Simple carbohydrates are made up of just one or two sugar units, whereas complex carbohydrates are made up of many sugar units.

Answer:

1, deductive reasoning

2, hypothesis

3, law

4, objective

5, presupposition

6, qualitative

7, quantitative

8, subjective

9, theory

Answer:

C. Fusion reactions require a lot of heat and pressure

Explanation:

A Nuclear fusion doesn't occur naturally on Earth because it requires temperatures far higher than Earth temperatures. Nuclear fusion takes place only at extremely high temperatures. That's because a great deal of energy is needed to overcome the force of repulsion between the positively charged nuclei.

option A is the correct one

It represents Mp orBp of a substance at a specific pressure

Answer:

aqueous solutions of silver nitrate and sodium chloride turn cloudy after mixing aqueous solutions of hydrochloric acid and sodium hydrogen carbonate produces bubbles on mixing Sodium hydroxide is mixed with water and the container feels warmer

Explanation:

A chemical change involves the formation of new substances. Also heat is absorbed or released in a chemical change. Another name for a chemical change is a chemical reaction.

In the first case, a reaction of the sort;

AgNO3(aq) + NaCl(aq) ---> AgCl(s) + NaNO3(aq)

The cloudy solution is due to the formation of AgCl precipitate.

In the second case, a reaction of the sort;

HCl(aq) + NaHCO3(aq) ---> NaCl(aq) + CO2(g) + H2O(l)

The gas evolved is due to the formation of CO2 in the process. Heat is also evolved showing that it is a chemical change.

Answer: That is Conduction

Explanation:

:)

Conduction

reason: Conduction is the transfer of heat through contact between items.

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Hazard signs such as "Flammable," "Oxidizer," and "Corrosive" National Fire Protection Association (NFPA) diamond Gas Cylinder sign posted signs convey information about chemical storage.

Pictograms are pictorial symbols that are used to express particular information about a chemical's risks. OSHA mandates pictograms on principal labels to indicate chemical dangers. The exact OSHA danger categorization determines each pictogram(s). There are several forms of risks in the workplace, including chemical, ergonomic, physical, and psychological hazards, to mention a few. Dangerous situations. Employees who operate with machinery or on construction sites are more likely to be exposed to safety concerns.  Biological dangers. Biological dangers are exceedingly hazardous  Physical dangers Ergonomic risks Chemical risks Workload risks.

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The ability to taste certain substances, such as a bitter compound called phenylthiocarbamide (PTC), is controlled by a specific gene known as the TAS2R38 gene.

If the mother is a non-taster and the male child also takes after her as a non-taster, it suggests that the mother carries two copies of the non-taster allele (recessive allele) for the TAS2R38 gene. In this case, the mother's genotype would be tt, where "t" represents the non-taster allele.

To determine the possible genotypes of the father, we would need to know whether the ability to taste PTC is a dominant or recessive trait. If it is a dominant trait, the father could have at least one copy of the taster allele (Tt or TT). If it is a recessive trait, the father would need to have two copies of the non-taster allele (tt).

Without more specific information or the pedigree diagram, it is difficult to determine the father's genotype in this family pedigree. It would be helpful to have additional details or a visual representation of the pedigree to make a more accurate determination.

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Answer:

4.6466 x 10^17 molecule/s

Explanation:

1 drop/hr = 0.05mL/hr

0.05mL H2O x 1g/mL = 0.05g

0.05g/(18g/mol) = 2.778 x 10^-3 mol

2.778 x 10^-3 mol x Na(6.022x10^23) = 1.67 x 10^21 molecule

(1.67x 10^21 molecule / hr) / (3600s/hr) = 4.6466 x 10^17 molecule/s

All of the measurements have 4

The number of significant figures in each of these measurements of an object's length: a. 4  b. 4 c. 4.

The significant figures are the digits or numbers from zero to nine which are used to signify and specify the reporting of the measurement having uncertain digits.

Starting zero is not significant, decimal is not significant, ending zero after the decimal is significant and ending zero before and without decimal is not significant.

Therefore, a. 76.48 cm = 4 b. 76.47 cm c. = 4 76.59 cm = 4 are the number of significant figures in each of these measurements of an object's length.

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