2 some organisms feed on other organisms without immediately killing them. what term describes this act? a. commensalism b. parasitism c. mutualism d. predation

The forces acting on the object are the pulling force, F and the frictional force exerted by the surface on the object.

Given that the object is pulled by a force that is acting in a direction parallel to the horizontal surface. The object is not showing any movement due to the force, that means the object is at rest.

The net force acting on an object is defined as the sum of the total forces acting on it.

Even after being pulled by the force, the object is not moving because, there is an equal and opposite force acting on the object which, tends the object to remain in rest or equilibrium.

Therefore, the net force on the object is zero. All the forces are balanced.

So, the opposite force, acting on the object will be the frictional force exerted by the surface, which is in contact with the object.

The frictional force is the resistive force that prevents the relative motion between two surfaces that are in contact with each other.

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Approximately 3.7 L of the 6.3 M solution of NaOH must be added to 4 L of the 0.5 M NaOH solution to obtain a final solution with a concentration of approximately 2.6 M.

To obtain the final solution, we need to use the formula:

M1V1 + M2V2 = M3V3

Where M1 and V1 represent the concentration and volume of the first solution (6.3 M and x L, respectively), M2 and V2 represent the concentration and volume of the second solution (0.5 M and 4 L, respectively), and M3 and V3 represent the concentration and volume of the final solution (2.6 M and (4+x) L, respectively).

Solving for x, we get x ≈ 3.7 L.

Therefore, adding approximately 3.7 L of the 6.3 M NaOH solution to 4 L of the 0.5 M NaOH solution will give us a final solution with a concentration of approximately 2.6 M.

To solve this problem, we need to use the formula for dilution, which states that the moles of solute before and after dilution are the same. This formula can be expressed in terms of concentration and volume, as shown above. We can solve for the unknown volume, x, by rearranging the formula and plugging in the given values. Once we have the value of x, we can add it to the initial volume of the second solution to get the final volume of the solution. This will give us the total amount of NaOH required to obtain the desired concentration.

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The energy of the photon with a frequency of 3.6×10¹⁵ Hz is 2.4×10¯¹⁸ J

Energy is defined as the ability to do work.

The energy of a photon is related to it's frequency according to the following equation:

Energy (E) = Planck's constant (h) × frequency (f)

E = hf

With the above formula, we can obtain the energy of the photon.

E = hf

E = 6.63×10¯³⁴ × 3.6×10¹⁵

E = 2.4×10¯¹⁸ J

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The energy of the photon is 2.4 × 10⁻¹⁸ J. The correct option is the last option 2. 4 × 10–18 J.

From the question,

We are to calculate the energy of a photon with a frequency of 3.6 × 10¹⁵ Hz

The energy of a photon can be calculated by using the formula,

\(E = h\nu\)

Where \(E\) is the Energy

\(h\) is the Planck's constant

and \(\nu\) is the frequency

From the given information

\(h = 6.63 \times 10^{-34} \ J.s\)

\(\nu = 3.6 \times 10^{15} \ Hz\)

Therefore,

\(E = 6.63 \times 10^{-34} \times 3.6 \times 10^{15}\)

\(E = 2.3868 \times 10^{-18} \ J\)

\(E \approx 2.4 \times 10^{-18} \ J\)

Hence, the energy of the photon is 2.4 × 10⁻¹⁸ J. The correct option is the last option 2. 4 × 10–18 J.

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Answer:

whats the answer i been trying to find it please

Explanation:

thanksss

Answer:

Evaporation, Radiation

Explanation:

Evaporation of water from your skin if it is wet (sweating). ...

Radiation (similar to heat leaving a woodstove).

Answer:

The most common isotope is Bromine-79.

Explanation:

Answer:

Oxygen

Explanation:

From the periodic table, you can see that the atomic mass of Oxygen is 15.999 (16), however, Carbon's mass is 12.011 (12).

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At standard temperature and pressure (STP), the element that is a monatomic ion is helium (He).

The element that is a monatomic ion at STP is helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn)

Standard Temperature and Pressure, abbreviated as STP, is a situation where the pressure is 1 atm (760 mmHg) and the temperature is 0°C.

Monatomic elements are stable elements with a single atom (mono). To ensure that an element is stable on its own, it needs to have a stable octet of valence electrons.
For example, helium is a noble gas, which means it is very stable and does not easily form compounds with other elements. At STP, helium exists as a monatomic ion, meaning it is a single atom with no charge. This is because helium has a full outer shell of electrons, making it unreactive and unable to form bonds with other elements.

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For this chemical, the heat of vaporization is 86*104 J/g. The conversion of 25.0 grammes of a chemical at its usual boiling point to a gas at 1 atmosphere of pressure requires the addition of 34,400 joules.

A phase transition from the liquid phase to the vaporization phase occurs when an element or molecule vaporization.

Evaporation and boiling are the two methods of vaporization. Boiling is a bulk phenomenon, whereas evaporation occurs on the surface.

The force perpendicular to an object's surface that is delivered per unit area over that force is known as pressure (symbol: p or P). The gauge pressure, also known as gauge pressure, is the pressure in relation to the surrounding air pressure.

q=mHv

=(25)(1)(34400)

= 86*10^4 J/g

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1. The correct answer is basic. Barium cyanide, Ba(CN)2, is an ionic compound composed of a barium cation and a cyanide anion.

When it is dissolved in water, it will dissociate into barium cations and cyanide anions. The barium cation has a +2 charge, so it will accept two hydrogen ions from the water, forming the barium hydroxide ion, Ba(OH)2, making the barium cation basic in nature.

2. The correct answer is acidic. Barium cyanide, Ba(CN)2, is an ionic compound composed of a barium cation and a cyanide anion.

When it is dissolved in water, it will dissociate into barium cations and cyanide anions. The cyanide anion has a -1 charge, and will donate a single hydrogen ion to the water, forming the hydronium ion, H3O+, making the cyanide anion acidic in nature.

3. The correct answer is neutral. An aqueous solution of barium cyanide, Ba(CN)2, will be neutral. When the compound is dissolved in water, it will dissociate into barium cations and cyanide anions.

The barium cation will accept two hydrogen ions from the water, forming the barium hydroxide ion, Ba(OH)2, and the cyanide anion will donate one hydrogen ion to the water, forming the hydronium ion, H3O+. These two processes will cancel each other out, resulting in a neutral solution.

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Yes, fruit juice react with metal.

Describe a metal.

Hard, lustrous, malleable, fusible, and ductile are all characteristics of metal, a solid material that conducts heat and electricity. The materials that have a propensity to donate electrons are metals.

An extremely active metal is aluminum. It develops a thin layer of aluminum oxide tarnish right away. The water stops the aluminum's reaction with the tarnish because it is mostly waterproof, but orange juice, which contains a moderate acid, can dissolve the tarnish and keep the aluminum's reaction with the liquid going.

Therefore, fruit juice react with metal.

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The bond angles in SF₅⁺ are expected to be 90°, 120°, and 180°.

The correct option is E.

Bond angles refer to the angles between the bond linking the atoms of elements in a compound or ion.

The bond angles exist as a result of either electrical repulsion between the electrons in the bonds.

The ion SF₅⁺ contains one atom of sulfur and five atoms of fluorine linked together by covalent bonds. The shape of the ion or the molecular geometry is square pyramidal. Hence, the bond angles are 90°, 120°, and 180°.

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The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

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Answer:

The mass of products is 207kg

Explanation:

To solve this question we can do mass balance assuming the engine that contains the gasoline produce only carbon dioxide and water, that is:

Mass of reactants = Mass of products

Where mass of reactants is mass of gasoline  + Mass oxygen = 207kg

That means the combined mass of products is 207kg

The answer is that they were were not based on evidence and experiment and that made alchemy unscientific in its practices.

Alchemy is an old practice that might be thought of as a forerunner of chemistry.

The term alchemy is derived from the Arabic al-kimiyya, which is derived from Greek. Alchemy's fundamental notions focus around the transformation of one substance into another, often transforming a basic metal like lead or iron into a "noble" metal like silver or gold

The alchemist's main ambitions were to find the Stone of Knowledge, the medium of Eternal Youth and Health, and metal transmutation.

To conclude with we can say Alchemy is based on magic and occultism rather than true investigation and facts. Many of the items in it have been utilised as fundamentals for certain chemistry, although the vast majority of them are wrong and inaccurate.

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Answer:

need points sorry

Explanation:

A germinating seed is one from which a plant has started to grow. A non-germinating seed is usually dry, and a new plant has not yet emerged. The germinating corn seed consumed more oxygen than the non-germinating corn seed. This statement is true.  Therefore, option A is correct.

A dry seed starts to absorb water through its seed coat when it comes into touch with damp soil or growing medium. The seed swells and the seed coat splits open as it absorbs more water. Small shoots and roots make up the embryo inside the seed. First to appear from the seed is the root.

The prerequisites for seed germination include oxygen, water, temperature, and, only for particular seeds, light. The sprouting of seeds is impacted when one or more of these are missing. Similar internal elements that impact this process include seed viability, dormancy, and embryonic maturity.

Thus, option A is correct.

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Answer:

it contains 2.56 x 10^15.

Explanation:

given no. of moles = 4.26 x 10^-9 atoms

one mole has 6.022 x 10^23 atoms

so it contains 4.26 x 10^-9 x 6.022 x 10^23 atoms

(If we suppose silver's atomic weight as 108.)

Answer: True

Explanation:

I remember learning this in AP Chemistry class. Protons and neutrons are in the nucleus of an atom when electrons are outside the core.

Answer:

Explanation:

Exothermic Reactions

Exothermic Reactions

This means that the energy required to break the bonds in the reactants is less than the energy released when new bonds form in the products. Excess energy from the reaction is released as heat and light. Figure: Chemical reaction: A Hermite reaction, which produces molten iron.

Answer:

136

Explanation:

The Mass Number is the combination of the amount of Protons and Neutrons in an element, so if the total mass is 222, and the amount of protons is 86, then you can do 86 + x = 222 to find that x is equal to 136

The main difference between corrosion and rust is that corrosion occurs as a result of the chemical influence and it affects a lot of materials whereas rusting is only accelerated by certain chemicals and usually affects iron substances

Hopes this helps :)

1. HCl(aq) + KOH(aq) --> KCl(aq) + H₂O(l)

2. Fe(s) + CuSO₄(aq) --> FeSO₄(aq) + Cu(aq)

3. KBr --> K + Br

4. Cl₂ + 2Na --> 2NaCl

5. Al₂(SO₄)₃ + Ca₃(PO₄)₂ --> 2AlPO₄ + 3CaSO₄

6. 2NaI + Cl2 --> 2NaCl + I₂

7. 2C₄H₁₀ + 13O₂ --> 10H₂O + 8CO₂

Based on the given information, it is possible that the mineral with the weaker reaction is a feldspar mineral, specifically an orthoclase or plagioclase feldspar.

The weaker reaction of a mineral with dilute hydrochloric acid (HCl) suggests that the mineral is likely composed of a mineral group that is less susceptible to acid dissolution. One such mineral group is the feldspar group.

Feldspar minerals, such as orthoclase and plagioclase, are commonly found in light-colored rocks and have a moderate to weak reaction with dilute HCl. They typically show a faint effervescence or no reaction at all when HCl is applied.

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Answer:

The Typical Oxidation number of Oxygen is –2.

And as the question said... its Oxidation changes to –1 when it is in Peroxides and –½ when its in SuperOxides.

Correct Answer : Option D.

Answer:

B. Warm year round with lots of precipitation

Explanation:

GIVEN

The answer to this question can be determined using the Ideal Gas Law, which states that PV = nRT.  the maximum volume of the airbag in the simulation contains 16.6 moles of gas.

The Ideal Gas Law, also known as the Combined Gas Law, is an equation of state that describes the behavior of an ideal gas. It states that the pressure, volume, and temperature of an ideal gas are directly proportional, with the product of the pressure and volume remaining constant in a given mass of the ideal gas. In other words, when any one of these three properties is changed, the other two properties will change in an inverse manner, keeping the product constant. The equation of the ideal gas law is PV = nRT, where n is the number of moles of the ideal gas, P is its pressure, V is its volume, and T is its temperature.

Using the formula

PV= nRT

where P is pressure,

V is volume,

n is the number of moles,

R is the ideal gas constant, and

T is temperature.

Given the maximum volume of the airbag (66.2 L) and the temperature of the environment (20°C),

we can calculate the number of moles of gas contained in the airbag.

n = (P × 66.2 L) / (R ×20°C)

Using the atmospheric pressure at sea level (101,325 Pa), the calculation can be further simplified to:

n = (101,325 Pa ×66.2 L) / (8.314 J/(Kmol) × 293.15 K)

n = 16.6 mol

Therefore, the maximum volume of the airbag in the simulation contains 16.6 moles of gas.

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Answer:

here are the answers !

Explanation:

1) the land surface cools quicker than the water surface at night. So the best Answer would be D

2) I think this answer would be True because When a fluid such as air or water touches a hot object, it can heat up and then move in bulk as a fluid, thereby carrying the heat quickly to new locations. Hot air rising is a common example of heat convection.

3) Wind is the movement of air from areas of high pressure to areas of low pressure.