Gustavo and Beatriz are pushing on a door in opposite
directions. If the door does not move, the forces are
The net force in this scenario would be Answer: balanced and zero

Answer:

Al4C3 +12 H2O → 4Al(OH)3 + 3CH4

4NH3 + 5O2 → 4NO + 6H2O

HAZWOPER training and certification recognize:

The correct option is both A and C

HAZWOPER (Hazardous Waste Operations and Emergency Response) training and certification recognize that a large number of victims (as much as 80%) in hazardous waste incidents or emergencies will self-present or be self-referred for medical treatment.

Additionally, HAZWOPER training acknowledges that victims may use any entrance they can access at a hospital, not just the emergency department entrance.

This is because individuals affected by hazardous materials may arrive at different areas of the hospital seeking medical assistance.

Therefore, option d. Both A and C are correct statements regarding the recognition of HAZWOPER training and certification.

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Answer: By use of magnet

Explanation: This is because pure iron is magnetic hence can be attracted

by a magnet

Answer:

By breaking down glucose into an energy molecule (ATP), so by producing energy which is necessary for the cell's survival.

Explanation:

Answer:

Two of them are solids, one is liquid. Two of them are edible, one is not. One is a mixture, and two are not.

Explanation:

The ph value of human saliva is between 6.2-7.6 with 6.7 being the average pH

ph value of human saliva is 7 and 6

Answer:

Idon't know if this helps but I think it is a linear structure and if I am wrong I am so sorry

Answer:

a) The molecular formula of oleic acid is: \(C_{18}H_{34}O_{2}\)

b) There are 5.74 x 10^21 molecules of oleic acid in a 3.00 mL sample.

Explanation:

a)

First, let's determine the empirical formula of oleic acid from the percentage composition provided by the question:

- Assuming a 100g sample of oleic acid, the correspondent mass of C, H and O would be:

mass of C = 76.54g

mass of H = 12.13g

mass of O = 11.33g

- We must determine the number of moles contained in each of the masses determined above. For that, let's use the atomic masses of C (12.01 u), H (1.007 u) and O (15.99 u) and the following equation:

\(number of moles = \frac{mass of sample}{molar mass}\)

number of moles of C = 76.54g / 12.01 g/mol = 6.373 mol C

number of moles of H = 12.13g / 1.007 g/mol = 12.04 mol H

number of moles of O = 11.33g / 15.99 g/mol = 0.7086 mol O

- Next, we'll try to find whole-number ratios by dividing each number of moles obtained by the smallest value obtained (0.7086):

C = 6.373 / 0.7086 = 8.994 ≅ 9

H = 12.04 / 0.7086 = 16.99 ≅ 17

O = 0.7086 / 0.7086 = 1.000

- Now, we can write the empirical formula of oleic acid as: \(C_{9}H_{17}O\)

Now that we have the empirical formula for oleic acid (C9H17O), let's check its molar mass and compare it to the experimental value provided by the question (282 g/mol):

molar mass (C9H17O) = 9 * 12.01 + 17 * 1.007 + 1 * 15.99 = 141.9 g/mol

Note that the molar mass obtained from the empirical formula (141.9 g/mol) and the experimental molar mass (282 g/mol) are different, thus we need to find an integer multiple to determine the molecular formula (keep in mind that molecular formulas always present kind and number of atoms of each element present in the molecular compound, while the empirical formula presents the smallest coefficients for each atom).

Molecular formula = n × Empirical formula

This integer multiple, n, can  be obtained by dividing the molar mass,  MM , of the compound by the empirical formula mass,  EFM  (the molar mass represented by the empirical formula):

n = MM / EFM

n = 282 / 141.9

n = 1.987 ≅ 2

Since the integer multiple is 2, we can multiply all coefficients in the empirical formula by 2 to find the molecular formula of oleic acid:

C9 H17 O x 2 = C18 H34 O2

Therefore, the molecular formula of oleic acid is: \(C_{18}H_{34}O_{2}\)

b)

We need to calculate the amount of molecules of oleic acid in a 3.00mL sample, considering the density as 0.895 g/mL.

From the density provided, we can calculate the mass, in grams, of oleic acid contained in 3.00 mL of this compound:

1 mL ----------------------- 0.895 g oleic acid

3.00 mL ----------------- x

Solving for x, we have that there are 2.69 g of oleic acid in a 3.00 mL sample.

Next, considering the molar mass of oleic acid (282 g/mol), we can calculate the number of moles contained in 2.685g of the acid:

282 g -------------------- 1 mol oleic acid

2.69 g ----------------- y

Solving for y, we have that there are 0.00953 moles of oleic acid in a 3.00 mL sample.

Now, using the Avogadro's number (6.022 x 10^23 particles/mol), we can calculate the amount of molecules of oleic acid in the sample:

1 mol oleic acid ------------------------------- 6.022 x 10^23 molecules oleic acid

0.00953 mol oleic acid ------------------- z

Solving for z, we have that there are 5.74 x 10^21 molecules of oleic acid in a 3.00 mL sample.

The identity of planet is:

A) Jupiter : 778,600,000 km

B) Neptune : 4,495100,00 km

C) Saturn : 1433500000 km

D) Uranus : 2872500000 km

The distance from the sun of planets is given in kilometers.

A) 778,600,000 km : Jupiter

Jupiter is fifth planet from the sun. Jupiter is the largest in the solar system. it is famous for iconic red spot.

B) 4,495,100,000 km :  Neptune

Neptune is eight planet from the sun. Neptune is the farthest planet in solar system.

C) 1,433,500,000 km : Saturn

Saturn is sixth planet from the sun. Saturn is second largest planet in solar system.

D) 2,872,500,000 km : Uranus

Uranus is seventh planet from the sun. For Uranus , equator is nearly at right angle to its orbit.

Thus,

A) Jupiter : 778,600,000 km

B) Neptune : 4,495100,00 km

C) Saturn : 1433500000 km

D) Uranus : 2872500000 km

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When the resistance changes , the distance between the electrodes will get changed to 62.74 cm

The resistance and length formula clearly states that, for a given material, the resistance is precisely related to its length. The resistance value of a material increases with an increase in length. The material's resistance value will drop as its length does as well.

Here it is given that ,

Resistance of solution of CuSO₄ (R₁) = 0.51 ohms,

Distance between electrodes (d₁)= 4.00cm

When resistance changes,

R₂= 8 ohms

We have to calculate d₂,

d₂=?

It is given that ,

Resistance is directly proportional to distance between electrodes,

R∝ d

R₁/R₂= d₁/d₂

0.51/8=4/d₂

d₂= 8×4/0.51

=62.74 cm

So, the distance between the electrodes will be 62.74 cm , it is directly proportional to the resistance, it increases as the resistance increases.

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Order, sensitivity or response to the environment, reproduction, growth and development, regulation, homeostasis, and energy processing.

Answer:

900 J/kg°C.

Explanation:

Answer:B. One that occurs on its own

Explanation:

Answer:

Nitrogen

Explanation:

Answer:

Yes, its nitrogen. I wrote my answer earlier in the wrong spot.

Explanation:

The atmosphere contains many gases, most in small amounts, including some pollutants and greenhouse gases. The most abundant gas in the atmosphere is nitrogen, with oxygen second. Argon, an inert gas, is the third most abundant gas in the atmosphere.

The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.

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Long-term (months or years) high blood sugar levels can cause irreversible harm to organs such the kidneys, blood vessels, eyes, nerves, and nervous system. Speak with your doctor or the diabetes care team if you frequently have hyperglycemia.

If left untreated, having excessive blood sugar levels for an extended length of time might lead to major health issues. In addition to raising the risk of heart disease, stroke, kidney illness, vision issues, and nerve issues, hyperglycemia can harm the blood arteries that provide blood to essential organs.

A high-fat, high-calorie, and high-cholesterol diet

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The percentage of carbon in Ca(C₂H₃O₂)₂ is calculated to be 30.41%.

The percentage of an element in a compound can be calculated by dividing the atomic mass of the element by the molar mass of the compound, then dividing by 100%.

We multiply this ratio by 100 to get the percentage form of the composition.

percent composition of C = atomic mass of C/molar mass of Ca(C₂H₃O₂)₂ × 100%

Molar mass of Ca(C₂H₃O₂)₂ = 40 + (24 + 3 + 32)2 = 158g/mol

% C = 12.01(4)/158 × 100

% C = 30.41%

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Answer:

Explanation:

To determine the amount of chlorine needed to make 75.0 grams of C2H2Cl4, we need to balance the chemical equation and then use the molar ratio between the reactants and product to find the amount of Cl2 needed.

The balanced equation is:

2 Cl2(g) + C2H2(g) -> C2H2Cl4(l)

Next, we can use the molar mass of C2H2Cl4 to find the number of moles of C2H2Cl4 produced:

75.0 g C2H2Cl4 x (1 mole C2H2Cl4 / 153.8 g C2H2Cl4) = 0.489 moles C2H2Cl4

Since the balanced equation has a 1:2 ratio of C2H2 to Cl2, this means that we need 2 moles of Cl2 for every mole of C2H2Cl4 produced. Therefore, we will need 2 x 0.489 moles = 0.978 moles of Cl2.

Finally, to find the volume of Cl2 at STP, we can use the ideal gas law:

PV = nRT

Where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant (0.0821 L-atm/mol-K), and T is the temperature in Kelvin (273 K).

Since the pressure is 1 atm and the temperature is 273 K, we can rearrange the equation to solve for volume:

V = nRT / P = 0.978 moles x 0.0821 L-atm/mol-K x 273 K / 1 atm = 17.1 L

Therefore, 17.1 liters of Cl2 at STP will be needed to make 75.0 grams of C2H2Cl4.

Answer:cathode

Explanation:It is also known as the galvanic cell or electrochemical cell. In the voltaic cell, the oxidation occurs at an anode which is a negative electrode and the reduction occurs at the cathode which is a positive electrode.

Answer:

Human actions cannot change Earth's atmosphere . decrease in Earth's temperature . Although researchers at the polar station have now concluded that global average temperature has increased and that this is causing ice to melt, some scientists initially disagreed that the ice was melting .

Okay! Variability and Regional Differences:

Ice cover, whether it's sea ice, glaciers, or ice sheets, is subject to natural variability. Some scientists argued that the observed decreases in certain regions might be part of a natural cycle rather than a long-term trend. They pointed to historical records and paleoclimatic data, which suggested that ice cover has fluctuated in the past. This led to debates about whether the observed decreases were within the bounds of natural variability or indicative of a broader decline.

Data Limitations and Measurement Techniques:

Obtaining accurate and comprehensive data on ice cover is challenging. Satellite observations, which are crucial for monitoring large-scale ice changes, have limitations in terms of spatial and temporal coverage. Early satellite records had relatively short time spans, making it difficult to discern long-term trends. Additionally, different measurement techniques and instruments might introduce discrepancies in the data, which could lead to varying interpretations.

Discrepancies in Interpretation:

Scientists may differ in their interpretation of the available data due to varying expertise, perspectives, and biases. Some researchers may emphasize specific aspects of the data that align with their hypotheses or theories. This can contribute to differing conclusions about whether overall ice is decreasing or not.

Focus on Localized Increases:

While overall ice cover might be decreasing globally, localized increases in ice could complicate the assessment. For example, some regions might experience temporary gains in ice due to factors such as increased precipitation or changes in atmospheric circulation patterns. These localized increases can lead to debates about the net change in ice cover and its significance.

Publication Bias and Scientific Communication:

The process of scientific publishing can introduce biases. Scientists often publish research findings that deviate from the norm or present novel interpretations, leading to a disproportionate representation of dissenting views. Media coverage might amplify these discrepancies, creating the impression of a more significant scientific disagreement than actually exists.

It is important to note that the scientific consensus has evolved over time, and subsequent research and advancements in observational capabilities have provided clearer evidence of overall ice decline. Numerous scientific studies have since demonstrated a consistent decrease in ice cover across various regions, including Arctic sea ice, glaciers, and ice sheets like Greenland and Antarctica.

Scientists employ a rigorous process of peer review and critical analysis to evaluate research findings, resolve discrepancies, and refine our understanding of complex phenomena like ice decline. The gradual convergence of evidence from multiple sources, improved data quality, and the consensus-building process have led to a clearer understanding that overall ice is indeed decreasing.

It's worth emphasizing that the scientific process is inherently self-correcting, and ongoing research continues to refine our understanding of ice changes and their implications for our planet's climate system.

Hydrocarbons are composed of hydrogen and carbon only and the hydrocarbon produced will differ according to their mole ratio.

Hydrocarbons are compounds composed only of carbon and hydrogen.

Hydrocarbons are very large families of compounds which have a common property of being combustible.

Hydrocarbons include:

The mole ratio of the carbon to hydrogen in each type of hydrocarbon differs.

Therefore, starting with 10 carbon and 3 Hydrogen, the hydrocarbon produced will differ according to their mole ratio.

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Answer: D.

Explanation:

Asexual reproduction requires only one parent, making it more efficient and take a shorter amount of time than sexual reproduction.

1)The earth is made up of three different layers: the crust, the mantle and the core.

2) I think an earthquake is when the tectonic plates form together and progress movement which cause floor shakiness and everything falls.

3) Earth's interior layers are ordered by density. The densest layer is the solid metal inner core, the mantle is of intermediate density, and the least dense layer is the lithosphere, particularly the continental lithosphere.

4) Earth's crust is divided into two types: oceanic crust and continental crust.

5)Surface waves travel along the surface. There are two types of body waves: P-waves travel fastest and through solids, liquids, and gases; S-waves only travel through solids. Surface waves are the slowest, but they do the most damage in an earthquake.

6)Indirect observation involves the analysis of textual material generated either indirectly from transcriptions of audio recordings of verbal behavior in natural settings or directly from narratives.

7)The mantle is divided into several layers: the upper mantle, the transition zone, the lower mantle, and D” , the strange region where the mantle meets the outer core.

8)The outer core is not under enough pressure to be solid, so it is liquid even though it has a composition similar to the inner core. Sulfur and oxygen could be present in the outer core.

Answer:

The main difference between practical work inside and outside a laboratory is that the practical work inside the lab includes good equipment and chemicals which are very advanced and the practical outside a laboratory is more about the safety of life.

Explanation:

Practicals are set up at stations with lab equipment and chemicals, where students can learn, and researchers can experiment and find different new things.

Thus, the practical work inside the lab includes lab equipment and chemicals, and the practical outside a laboratory is more about conserving nature.  

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Structural isomers are molecules with the same molecular formula but with different structural formulae. This means that they have the same number and types of atoms, but they are arranged differently. The following two organic compounds are structural isomers of each other.

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The de Broglie wavelength of an electron traveling at 1.59×105m/s is  0.4547 x 10⁻⁹ m.

The elementary electric charge of the electron is a negative one, making it a subatomic particle. Due to their lack of known components or substructure, electrons, which are part of the first generation of the lepton particle family, are typically regarded to be elementary particles.

The length scale at which a particle's wave-like characteristics are significant is indicated by its de Broglie wavelength. The symbol or dB is typically used to indicate the De Broglie wavelength. The de Broglie wavelength for a particle with momentum p is given by dB = hp.

λ = h/mv

Where,

λ = wavelength of electron

m = mass of electron = 9.11e-31 kg

v = speed of electron = 1.59 × 10⁵ m/s

h = constant

Therefore,

λ = (6.626x10⁻³⁴J-s) ÷  [(9.11e-31 kg) (1.59 x 10⁵ m/s)]

λ = 0.4547 x 10⁻⁹ m

Thus, The de Broglie wavelength of an electron traveling at 1.59×105m/s is  0.4547 x 10⁻⁹ m.

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