Can someone answer #1 for me please I’ll gift extra points! ☺️

Answer:

true?

Explanation:

Answer:

Circulation of fluids

Explanation:

Convection is transferring thermal energy by circulation of fluids

Convection is heat transfer by the movement of currents within a fluid. During convection, heated particles of fluid begin to flow. When a liquid or gas is heated, the particles move faster and spread apart. As a result, the particles of the heated fluid occupy more space.

Answer:

Read only memory (ROM) is non-volatile primary storage. It keeps its contents when the computer is turned off. ROM can be read from but not written to. ROM can be read from but not written to, hence the term read only.

Explanation:

The inertia of a bowling ball is greater than​ the inertia of a golf ball.

In Newton's first law, it is stated that if the resultant force acts on an object of magnitude is zero, it can be formulated:  

[tex]\large{\boxed{\bold{\sum F=0}}[/tex]

then the object tends to defend itself from its state.  

or can be stated:  

An object at rest stays at rest and an object in motion stays in motion unless acted upon by an unbalanced force.  

So for objects in a state of movement, objects tend to move forever. Likewise, for objects in a state of rest, they tend to remain forever. The tendency of objects like this is called inertia  

The size of inertia is proportional to mass, the greater the mass of the object, the greater the inertia of the object.  

Objects that have more mass will have more ability to maintain their state

So a larger bowling ball mass will have greater inertia than a golf ball

Answer:

greater than

Explanation:

I did this assignment

Answer:

1. 0.891

2. 0.891

3. 1,090.8

4. 1,090.8

Explanation:

Answer:

V1= 125.0mL    125.0mL/10.0C=50.0mL/T2

T1= 10.0C         T2=(125.0mL/10.0C) X 50.0mL

V2= 50.0mL       T2= 625L

T2=?

Explanation:

I'm pretty sure about this It took me a while to get it but I already took the test

Answer:

2. chloroplast

3. cell wall

4. vacuole

5. mitochondrion

6. nucleus

7. lysosome

8. cytoplasm

Explanation:

Answer:

1. All beauty salons must be well-lighted and well-ventilated and must be in good sanitary condition.

2. The salon premises must be free from rodents, vermin, flies or other similar insects.

3. All salon establishments must be provided with continuous running hot and cold water.

4. The curtains and floor coverings in the salon must be washable and kept clean.

5. All hair, used cotton or other waste materials must be removed from the floor immediately, and deposited in a closed container. Get rid of them from the salon premises at frequent intervals.

6. The rest rooms must be well-sanitized and be provided with individual towels.

7. Each beautician must wear a washable uniform while working on clients.

The salon is a place meant for the treatment of hair. Measures have to be taken to ensure that it is kept clean and safe at all times.

The measures that have to be taken in keeping the salon clean and safe are:

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Answer:

C3H8O

Explanation:

These are the steps:

1. Write the given value for each element.

2. divide them by their Ar.

3. Divide the result by the smallest value in the ratio.

C H O 59.94% 13.44% 26.62% 59.94÷12 13.44÷1 26.62÷16

4.995 13.44 1.664

(4.995÷ 1.664) (13.44÷ 1.664) (1.664÷1.664)

3.00 8.07 1

3 : 8 : 1

So the compound is C3H8O.

Answer:

The third electron to be removed has to be in;

n = 3

l = 2

ml = -2, -1, 0, 1, 2

Explanation:

There are four basic quantum numbers;

i) principal quantum number (n)

ii) Azimuthal, Obital or Subsidiary quantum number (l)

iii) Magnetic quantum number (ml)

iv) Spin quantum number (ms)

The electronic configuration of Fe3+ is:

1s2 2s2 2p6 3s2 3p6 3d5

The third electron to be removed has to be in;

n = 3

l = 2

ml = -2, -1, 0, 1, 2

The third electron removed in the formation of a Fe³⁺ has the quantum numbers:

Iron has an atomic number of 26, so it has the following electron configuration:

[tex]Fe: [Ar] 4s^{2} 3d^{6}[/tex]

To form cations, it first loses the electrons from the outermost shell (4s). The electron configuration of Fe²⁺ is:

[tex]Fe^{2+} : [Ar] 4s^{0} 3d^{6}[/tex]

Then, it will lose an electron from the highest energy level (3d) to form Fe³⁺.

[tex]Fe^{3+} : [Ar] 4s^{0} 3d^{5}[/tex]

The third electron lost from Fe to form Fe³⁺ was in 3d⁶.

The third electron removed in the formation of a Fe³⁺ has the quantum numbers:

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Answer:

V1 = 10 L

V2 = x L

T1 = 350 K

T2 = 680 K

And you are looking for the second Volume

 the image shows the work and the answer is going to be 19.4 L or just 19 L

Hence, 19.4 L is the new volume of gas when the initial volume of 10L at a temperature of 350K and is then heated to 680K.

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases.

An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

Given data:

[tex]V_1[/tex] = 10 L

[tex]V_2[/tex] =?

[tex]T_1[/tex] = 350 K

[tex]T_2[/tex]= 680 K

Now using equation:

[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]

[tex]\frac{10 L}{350 K} = \frac{V_2}{680 K}\\[/tex]

[tex]V_2[/tex] = 19.4 L

Hence, 19.4 L is the new volume of gas when the initial volume of 10L at a temperature of 350K and is then heated to 680K.

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Answer:

Weight

Explanation:

WHen talking about weight you’re referring to the force exerted to lift if, but when you’re talking about mass it’s just how much it weighs but not how much it takes to lift it.

Answer:

pH = 4.50

Explanation:

A weak acid HX reacts with NaOH as follows:

HX + NaOH → H2O + NaX

Initial moles of HX are:

0.585L * (0.200mol / L) = 0.117 moles of HX

The moles of NaOH are moles of NaX that are produced, that means:

0.500L * (0.140mol / L) = 0.07 moles of NaOH = 0.070 moles of NaX produced.

And moles of HX that still in solution are:

0.117 moles - 0.070 moles = 0.047 moles of HX

To find the pH of this buffer (Mixture of a weak acid, HX with its conjugate base, NaX) we use H-H equation:

pH = pKa + log [NaX] / [HX]

Where pKa is -log Ka = 4.327

And [] could be taken as moles of each species.

Replacing:

pH = 4.327 + log [0.070] / [0.047]

Answer:

157 64 Gd + 1 0 n -----> 158 64 Gd + γ

Explanation:

In a nuclear reaction, both mass and charge are conserved. If we look at the equation above, we will notice that this principle was followed.

Gama rays has no mass and charge because it is an electromagnetic wave. The relative atomic mass of the isotope of Gd formed in the reaction is 158 Gd. The atomic number remains the same.

Answer:

A.  a nucleus that has a greater mass number than the starting materials

Explanation:

The statement is "a nucleus that has a greater mass number than the starting materials."

Nuclear fusion occurs when two or more atomic nuclei unite to generate one or more new atomic nuclei and subatomic particles.

Two light nuclei fuse to form a single heavy nucleus in a fusion reaction. Because the overall mass of the resulting single nucleus is smaller than the mass of the two initial nuclei, the process releases energy.

Hence, the correct option is A

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Answer:

Maybe D? B?

Explanation:

Sorry if I made u get it wrong

Answer: a

Explanation: enzymes are a type of chemical in your body that helps break down food, thus it’s a chemical change in your body.

Food is broken down by the enzymes in the stomach is an example of chemical change happening inside the body. So the correct option is A.

The process of breakdown down food into its constituent nutrients is defined as the process of digestion. The process of digestion is of two types -

Thus, digestion begins in the mouth and both mechanical and chemical digestion takes place in the mouth. In the small intestine, the food is broken down into the smallest constituent nutrients and absorbed into the body.

Therefore the correct option is A.

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Answer:

O copper ore

Explanation:

Answer:

a rock that contains enough of a metal to be worthwhile to extract

Explanation:

Answer:

False

Explanation:

Cells are constantly dying and being reproduced.

Answer:

False.

Explanation:

Your cells are in a constant state of dieing and being replaced by new cells. As a result, very few of the cells in your body now are the exact same cells that you had 20 years ago. Your cells are constantly dying, but they're being replaced with new, fresh cells. ... The average age of a cell is 7 years… but that doesn't mean that every cell is replaced in 7 years. Some cells, in fact, never get replaced at all, remaining with us from birth until death.

Answer: B

Explanation:

Answer:

[tex]m_{Fe}=4.02x10^{2}gFe[/tex]

Explanation:

Hello!

In this case, since the mole-mass relationships allows us to compute the moles or mass of a sample given the mass or moles via the atomic (elements) or molar mass (compounds). For iron, whose atomic mass is 55.847 g/mol, we can compute the mass o 7.20 moles as shown below:

[tex]m_{Fe}=7.20molFe*\frac{55.847gFe}{1molFe}\\\\m_{Fe}=4.02x10^{2}gFe[/tex]

As you can see we write 1 mol Fe on bottom in order to cancel the given moles out.

Best regards!

Answer:

[tex]P=1.95atm[/tex]

Explanation:

Hello!

In this case, since we are asked to compute the pressure of 0.175 moles of the given gas at 22.0 °C occupying a volume of 2175 mL, we can use the ideal gas equation as shown below:

[tex]PV=nRT[/tex]

Whereas our unknown is P and we solve for it as shown below:

[tex]P=\frac{nRT}{V}\\ \\P=\frac{0.175mol*0.082\frac{atm*L}{mol*K}*(22.0+273.15)K}{2175mL*\frac{1L}{1000mL} }\\ \\P=1.95atm[/tex]

Take into account that based on the given R units, the temperature must be in Kelvins and the volume in liters.

Best regards!

Answer:

0.3704M is the concentration of KOH

Explanation:

The reaction of the monoprotic acid, KHP, with KOH is:

KHP + KOH → H₂O + K₂P

An acid reacts with a base to produce water and a salt

The molar mass of KHP is 204.22g/mol, that means in 3.458g of KHP you have:

3.458g * (1mol / 204.22g) = 0.01693 moles KHP.

At the endpoint:

Moles KHP = Moles KOH. That means moles KOH Are 0.01693 moles. These moles are in 45.71mL = 0.04571L, the molar concentration is:

0.01693 moles KOH / 0.04571L =

The concentration of the KOH solution needed for the reaction is 0.370 M.

We'll begin by calculating the number of mole in 3.458 g of KHP. This can be obtained as follow:

KHP => Potassium hydrogen phthalate

Mass of KHP = 3.458 g

Molar mass of KHP = 204.22 g/mol

Mole = mass / molar mass

Mole of KHP = 3.458 / 204.22

KHP + KOH → H₂O + K₂P

From the balanced equation above,

1 mole of KHP reacted with 1 mole of KOH.

Therefore,

0.0169 mole of KHP will also react with 0.0169 mole of KOH to the end point.

Mole of KOH = 0.0169 mole

Volume = 45.71 mL = 45.71 / 1000 = 0.04571 L

Concentration = mole / Volume

Concentration of KOH = 0.0169 / 0.04571

Therefore, the concentration of the KOH solution needed for the reaction is 0.370 M

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Answer:

Ar = 1.63g/L; N₂ = 1.14g/L. The density of Argon is higher than density of nitrogen because molar mass of argon > Molar mass nitrogen

Explanation:

It is possible to obtain the density of a gas using the formula:

ρ = PM / RT

Where ρ is density in g/L

P is pressure of the gas (101.3kPa)

M is molar mass of the gas (Ar: 39.9g/mol; N₂: 28g/mol)

R is gas constant (8.314kPaL/Kmol)

And T is temperature (298K)

Thus, density of Ar and N₂ is:

Ar = 101.3kPa*39.9g/mol / 8.314kPaL/Kmol*298K

Ar = 1.63g/L

N₂ = 101.3kPa*28g/mol / 8.314kPaL/Kmol*298K

N₂ = 1.14g/L

As general rule, under the same conditions, the gas with the higher molar mass will be the gas with higher density.

The argon gas will have greater density when compared to nitrogen gas in the given condition.

The given parameters;

The ideal gas law can be used to determine the density of the gases;

[tex]PV = nRT\\\\PV = \frac{m}{M} RT\\\\PM = \frac{m}{V} RT\\\\PM = \rho RT\\\\\rho = \frac{PM}{RT}[/tex]

where;

The molar mass of nitrogen gas is given as;

M = 14 g/mol

The molar mass of argon gas is given as;

M = 40 g/mol

From the formula given above, we can conclude that the gas with greater molar mass will have greater density, in this case the argon gas will have greater density when compared to nitrogen gas in the same condition.

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