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Answer:

D. 48 N down

Explanation:

Given that:

Mass of climber = 85 kg, Tension on rope = 785 N, acceleration due to gravity = 9.8 m/s²

To calculate the net force on the climber, we need to first calculate the weight of the climber. Since the climber is affected by the earth gravity, the weight of the climber is the product of his mass and the acceleration due to gravity, therefore:

Weight = mass × acceleration due to gravity = 85 kg × 9.8 m/s² = 833 N

The weight of the climber is acting downwards while tension on the rope is acting upwards, therefore:

Net force on the climber = 785 N - 833 N = - 48 N

This means that the net force on the climber is 48 N downwards

Answer:

48 N down

Explanation:

Ayepecks

Answer:

Difference in temperature.

Explanation:

Conduction is the movement of heat energy through a substance or from one substance to another by direct contact of atoms and molecules. Heat moves directly from one molecule to another. The heat energy speeds up the movement of the atoms and they collide with other molecules setting them into faster motion.

Answer: 0.52849 j /g °C

Explanation:

Given the following :

Mass of metal = 36g

Δ Temperature of metal = (28.4 - 99)°C = - 70.6°C

Mass of water = 70g

Δ in temperature of water = (28.4 - 24.0) = 4.4°C

Heat lost by metal = (heat gained by water + heat gained by calorimeter)

Quantity of heat(q) = mcΔT

Where; m = mass of object ; c = specific heat capacity of object

Heat lost by metal:

- (36 × c × - 70.6) = 2541.6c - - - - (1)

Heta gained by water and calorimeter :

(70 × 4.184 × 4.4) + (12.4 × 4.4) = 1288.672 + 54.56 = 1343.232 - - - - (2)

Equating (1) and (2)

2541.6c = 1343.232

c = 1343.232 / 2541.6

c = 0.52849 j /g °C

answer is 20

explanation: total Pressure = 205

partial pressure of N = 143

partial pressure of He = 41

total pressure = partial pressure of N + partial pressure of O + partial pressure of He

partial pressure of O = 205 - 185 = 20

Answer:

20

Explanation:

Answer:

Mass number

Nucleus

Explanation:

The combined number of protons and neutrons is the mass number in atomic notation.

The atomic number is just the number of protons alone.

The nucleus holds both neutrons and protons.

Electrons circle around the nucleus.

Answer: atomic mass I did it

Explanation:

Answer:

Neutral substance is a substance that show no acid or base properties.

Explanation:

Neutral substance is a substances that show no acid or base properties, has an equal number of hydrogen and hydroxyl ions and does not change the color of litmus paper.

Answer:

They release no substance

Explanation:

Since the substance is neutral, nothing will be released from it.

Answer: The molality of this solution is 1.7 m

Explanation:

Depression in freezing point:

[tex]T_f^0-T^f=i\times k_f\times m[/tex]

where,

[tex]T_f[/tex] = freezing point of solution = [tex]-70.55^0C[/tex]

[tex]T_f^0[/tex] = freezing point of pure chloroform = [tex]-63.5^0C[/tex]

[tex]k_f[/tex] = freezing point constant of benzene = [tex]4.07^0Ckg/mol[/tex]

m = molality

i = Van't Hoff factor = 1 (for non-electrolyte)

[tex]-63.5-(-70.55)^0C=1\times 4.07^0Ckg/mol\times m[/tex]

[tex]7.05=1\times 4.07^0Ckg/mol\times m[/tex]

[tex]m=1.7[/tex]

Thus the molality of this solution is 1.7 m

Answer:

D; Iónico

Explanation:

El elemento con 8 protones es oxígeno, mientras que el elemento con 11 protones es sodio.

El sodio es un metal alcalinotérreo, mientras que el oxígeno no es un metal.

En general, cuando tenemos un elemento metálico como el sodio, que se une con uno no metálico como el oxígeno, el tipo de enlace formado como resultado de la transferencia completa de electrones desde la capa de valencia del sodio a la capa de valencia del oxígeno para completar su propia configuración de octeto se denomina enlace electrovalente o, más generalmente, enlace iónico

Answer:

Explanation:ifk

Answer:

A small positively charged nucleus surrounded by revolving negatively charged electrons in fixed orbits

Answer:

[tex]\boxed{CH_{4}+O_2 --> CO_2 + H_2O}[/tex]

Explanation:

Step 1. Methane's formula is [tex]CH_4[/tex].

Step 2: Oxygen is a diatomic molecule (it exists bonded to itself for stability purposes), so by itself in chemical equations, it is written as [tex]O_2[/tex].

Step 3: Carbon dioxide is the molecular compound of one atom of carbon and two atoms of oxygen → [tex]CO_2[/tex].

Step 4: Water is the common name of the compound of two hydrogen atoms and one oxygen atom → [tex]H_2O[/tex].

Step 1: Use the determined formulas for the reactants and plug them into the equation. We are told that methane burns in oxygen -- hinting at a combustion reaction. Therefore, we may infer that these are the reactants that yield the products.

Skeleton equations are written with the reactant(s) on the left -- if there are several, they are separated by an addition symbol (+).

With this information, we may begin our equation: [tex]CH_4 + O_2[/tex], where [tex]CH_4[/tex] is methane and [tex]O_2[/tex] is the diatomic molecule of oxygen.

Step 2: Use the determined formulas for the products and plug them into the equation. We are told that the methane burns in oxygen to produce carbon dioxide and water. Hence, we can separate these two as we did with the reactants.

Now, our products side of the reaction will look like this: [tex]--> CO_2 + H_2O[/tex], where [tex]CO_2[/tex] is carbon dioxide and [tex]H_2O[/tex] is water.

Step 3: Write the final equation. All you must do after determining both sides of the equation is simply push them together. Place the reactant side of the equation on the left and the product side of the equation on the right.

This gives us our final equation, [tex]\boxed{CH_4 + O_2 --> CO_2 + H_2O}[/tex].

Because the problem asks for the unbalanced equation, we do not need to take any further steps of balancing the equation.

Answer:

pH: 11

pOH: 3

Explanation:

NaOH is a strong base which means that it dissociates completely in water. It will break apart into Na⁺ and OH⁻ ions.

NaOH ⇒ Na⁺ + OH⁻

Because NaOH dissociates completely into its respective ions in water, the moles of NaOH is equal to the moles of hydroxide ions. So, [OH⁻] = 0.001 M.

Now to find the pOH, use the formula pOH = -log[OH⁻].

pOH = -log[OH⁻]

= -log(0.001)

= 3

The pOH of the solution is 3.

To find the pH, subtract the pOH from 14 since pH + pOH = 14.

14 - 3 = 11

The pH of the solution is 11.

Hope that helps.

Answer:

See the answer below

Explanation:

In chemistry, indicators are substances that are capable of changing colors with respect to the pH. Each indicator has its characteristic color in acidic pH and another characteristic color in alkaline pH.

Methyl orange indicator appears red in acidic solution and yellow in basic solutions. Phenolphthalein is usually colorless in acidic solutions and appears pink in basic solutions. A red litmus paper will turn blue in alkaline solutions while a blue litmus paper will turn red in acidic solutions.

Answer:.

Explanation:

Answer:

the answer for the question is 40 mL

Answer: I don't know how to add a picture, so I might not explain this well.

Explanation: You put Na in the first box. Then you put F in the center of the second box because it gained one electron from Na. Then in the third box you put Na [+] because it lost one electron so it's now an cation(has a positive charge) because it lost a valence electron. In the last box you would put F [-] because it gained one electron so it's now an anion( has a negative charge) because it gained a valence electron. F now has 8 valence electrons and Na has 8 as well therefore they're both balanced.

The final method of sodium fluoride is NaF. An ionic compound is formed with the aid of the complete transfer of electrons from a steel to a nonmetal and the ensuing ions have achieved an octet.

The chemical formula of sodium fluoride is NaF and its molar mass is 41.99 g/mol. it's miles an easy ionic compound, made from the sodium (Na+) cation and fluoride (F-) anion. The strong salt exists as cubic crystals just like the crystal structure of sodium chloride (NaCl).

Sodium fluoride is synthetic via the response of hydrofluoric acid with sodium carbonate or sodium hydroxide with the formula NaF. The most inexpensive chemical to be had for fluoridation is sodium fluorosilicate, formerly referred to as sodium silicofluoride.

Learn more about sodium fluoride here: https://brainly.com/question/15684463

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Answer:

A. Sodium trioxonitrate (V) or sodium nitrat, NaNO3.

B. Calcium hydrogen carbonate, CaHCO3.

C. Ammonium chloride, NH4Cl.

D. Potassium hydrogen sulphate, KHSO4.

Explanation:

A. Sodium metal replaces hydrogen ions of nitric acid.

The equation for the reaction is given below:

2Na + 2HNO3 —> 2NaNO3 + H2

The salt formed is NaNO3 with the name sodium trioxonitrate (V) or sodium nitrate.

B. Calcium metal partially replaces hydrogen ion of carbonic acid.

The equation for the reaction is given below:

2Ca + 2H2CO3 —> 2CaHCO3 + H2

The salt formed is CaHCO3 with the calcium hydrogen carbonate

C. Ammonium ion replaces the hydrogen ions of hydrochloric acid.

The equation for the reaction is given below:

NH3 + HCl —> NH4Cl

The salt formed is NH4Cl with the name ammonium chloride.

D. Potassium metal partially replaces the hydrogen on of sulphuric acid.

The equation for the reaction is given below:

2K + 2H2SO4 —> 2KHSO4 + H2

The salt formed is KHSO4 with the name potassium hydrogen sulphate.

Answer:

The acid solution is a concentrated solution.

Explanation:

Acetic acid is a weak acid, because it ionizes partially in water as shown below:

CH3COOH + H2O —> H3O+ + CH3COO-

A solution containing a larger quantity of acetic acid is termed concentrated solution.

This is so because a concentrated solution is a solution that contains more of the solute than the solvent.

A solute is the substance which dissolves in the solvent.

A solvent is the substance which dissolves a solute.

In this case, acetic acid is the solute and water is the solvent.

Solution is simply the combination of solute and solvent

Solution => Solute + Solvent

More solute + Less solvent => Concentrated solution

Therefore, a solution containing a higher quantity of acetic acid ( i.e the solute) in water (i.e the solvent) is called a concentrated solution.

Answer:

a) 0°C

b) liquid

c) The energy supplied at 100°C is utilized in breaking the intermolecular forces in the liquid.

d) 100°C

e) gas

Explanation:

There are three States of matter; solid, liquid and gas. If we start heating 25g of ice in a beaker with a thermometer inserted into it, the ice will change from solid to liquid and finally to gas as the temperature increases.

At 0°C, the solid ice begins to melt and remains liquid between 0°C-100°C. This is called the liquid range of water. At 100°C, the heat supplied does not lead to further rise in temperature. The energy supplied is rather utilized in breaking the intermolecular forces in the liquid. This is known as the latent heat of vaporization. Above 100°C, the liquid is changed to vapour. Water vapour is commonly called steam.

Answer:

[tex]\large \boxed{\sf subatomic \ particles}[/tex]

Explanation:

The smaller particles in an atom are called subatomic particles. Subatomic particles include electrons, protons, and neutrons.

Answer:

Elements with unpaired valence electrons in the outer orbital are paramagnetic. Elements that are predicted to exhibit paramagnetic behavior may exhibit ferromagnetic behavior. Elements that contain only paired valence electrons are diamagnetic.

Answer:

Higher in the atmosphere temperature changes

Explanation: The tops of tall mountain might have ice or snow because it’s cooler in higher parts of the atmosphere.

Answer:

put the answers plz

Explanation:

Answer:

a chemical change

Explanation:

a physical change is mostly identified even without indicators i.e candle wax about forming a new acid or base I guess we have to include a ph scale to ascertain since the salt can be acidic but not necessarily an acid

Answer: The answer is A, a chemical change has occurred

Explanation:

I’m just a jenious

Answer:

Scientific Classification. Classification, or taxonomy, is a system of categorizing living things. There are seven divisions in the system: (1) Kingdom; (2) Phylum or Division; (3) Class; (4) Order; (5) Family; (6) Genus; (7) Species. ... Species are identified by two names (binomial nomenclature)

Explanation:

Answer:

Blue wave.

Explanation:

Answer:

E. None of the above

Explanation:

Answer:

C

Explanation:

because valence electrons are located at the last energy level

Element Grouping Quick Check:

1. Which element has two valence electrons?

D. calcium

2.Based on its position in the periodic table, which element would have seven valence electrons?

A. Chlorine

3. Which phrase describes a valence electron?

C. An electron in the outer energy level of an atom

4. Which phrase best describes a period on the periodic table?

A. A row of elements

5. Which two elements have the same number of energy levels with electrons in them?

A. Boron and Oxygen

Hope this helps!

Explanation:

the carbonate and the hydrochloric acid are the same in both reactions as products

Answer:

Concept of chemi-fluorescence

Explanation:

A glow stick usually consists of two chemicals in a larger plastic tube: , a base catalyst (mostly sodium salicylate), and a suitable dye (sensitizer, or fluorophor). This creates an exergonic reaction when mixed together.

When a glow stick is bent, the flurophor which is a chemical that easily re-emits light upon excitation in smaller capsules is released into the other substance, there by causing it to emit radiation/light in the uv-visible region. The brightness and longevity of the glow stick is determined by varying the concentration of these chemicals.

I hope this explanation clarifies things.

Answer:

2835 J

Explanation:

Take the specific heat capacity of water as 4.2 J/ g°C.

Energy (heat) = mass x specific heat capacity x change in temperature

(E= mcΔT)

E = 27 x 4.2 x (45-20)

E = 2835 J