Which is an example of an instinct?
A spider spins web A child speaks Chinese.
A sea lion balances a ball on its nose.
A dog stays away from skunks.

Answer: 4.5

Explanation:

Answer:

D.

Explanation:

Suspension : for example sand and water. You can separate it when it sits still.

The type of mixture is likely to separate if it is allowed to sit still is suspension. Therefore, option D is correct.

A heterogeneous mixture of a finely dispersed substance in a liquid is referred to as a suspension. Similar to how salt and water dissolve in one another, the solid is not dissolved in the liquid.

Examples of mixtures that are most frequently used are chalk and water, dirty water, flour and water, dust and air, fog, magnesium milk, etc.

Suspension parts can be divided into three categories: linkages, springs, and shock absorbers. The bars and brackets that support the wheels, springs, and shock absorbers are known as links. The car is padded by springs, which reduce shock loads caused by potholes and bumps in the road.

A fluid mixture that contains solid particles large enough for sedimentation is called a suspension.

Thus, option D is correct.

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Answer:

22Mol

Explanation:

2Mg + O2 --> 2MgO

If 11 mols of O2 reacted with excess Mg with 22 MgO moles will be created

Answer : The temperature [tex]Cl_2[/tex] gas is, 153 K

Explanation :

Using ideal gas equation:

[tex]PV=nRT[/tex]

where,

P = Pressure of [tex]Cl_2[/tex] gas = 900 torr = 1.18 atm   (1 atm = 760 torr)

V = Volume of [tex]Cl_2[/tex] gas = 0.750 L

n = number of moles [tex]Cl_2[/tex] = 0.0705 mole

R = Gas constant = [tex]0.0821L.atm/mol.K[/tex]

T = Temperature of [tex]Cl_2[/tex] gas = ?

Putting values in above equation, we get:

[tex]1.18atm\times 0.750L=0.0705mole\times (0.0821L.atm/mol.K)\times T[/tex]

[tex]T=152.9K\approx 153K[/tex]

Therefore, the temperature [tex]Cl_2[/tex] gas is, 153 K

Answer:The answer is B

Explanation:

There is less water lost due to evaporation and therefore more available to plants. Mulch and minimum tillage results in twice as much available water as does deep tillage. This is an immediate benefit. We are looking for future benefits: less runoff and erosion, more soil stays in place, the soil is more fertile, and farmers use less fossil fuels.

Answer:

[tex]m_{Al} = 18.019\,g[/tex]

Explanation:

There is a heating process between an aluminium piece and water, which is described by the First Law of Thermodynamics:

[tex]Q_{Al} = - Q_{w}[/tex]

[tex]m_{Al}\cdot c_{Al}\cdot (T_{o,Al}-T) = m_{w}\cdot c_{w}\cdot (T-T_{o,w})[/tex]

The mass of the aluminium piece is therefore cleared and known variables are substituted:

[tex]m_{Al} = \frac{m_{w}\cdot c_{w}\cdot (T-T_{o,w})}{c_{Al}\cdot (T_{o,Al}-T)}[/tex]

[tex]m_{Al} = \frac{(100\,g)\cdot \left(4.184\,\frac{J}{g\cdot^{\circ}C} \right)\cdot (15^{\circ}C-10^{\circ}C)}{\left(0.900\,\frac{J}{g\cdot ^{\circ}C} \right)\cdot (144^{\circ}C-15^{\circ}C)}[/tex]

[tex]m_{Al} = 18.019\,g[/tex]

Answer:

0.0521 M

Explanation:

          HClO2 + NaOH ---> NaClO2 + H2O

M(HClO2)V(HClO2) = M(NaOH)V(NaOH)

M(HClO2)*41.6 mL = 0.146 M*14.85 mL

M(HClO2) = 0.146*14.85/41.6 M = 0.0521 M

Answer:

C) It has a constant average kinetic energy

Explanation:

The average kinetic energy of the particles in a gas is directly proportional to the temperature of the gas, according to the equation.

k is the Boltzmann's constant

T is the absolute temperature of the gas

Therefore, temperature of a gas is a measure of the average kinetic energy of the particles.

In this problem, we are told that the gas is at constant temperature (and volume): therefore, according to the previous equation, this means that the average kinetic energy is also constant.

Answer:

C - It has a constant average kinetic energy

Explanation:

Got it right on the test

To determine the concentration of a solution, you need to first measure the volume of the solution, then calculate the moles of solute present. After these measurements, divide the number of moles of solute by the volume of the solution in liters to get the molarity. For dilutions, use the formula M1V1 = M2V2.

To determine the concentration of the solution in the eyedropper, we would use the concept of molarity and possibly dilution. As presented in the instructional guidelines:

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In Eyedropper the 1:10 solution is more concentrated than the 1:20 solution.

The concentration of the unknown solution in the eyedropper, follow these steps:

C2 = (C1 * V1) / V2 = (1.3 x [tex]10^-^4[/tex] M * 2.0 mL) / 10.0 mL = 2.6 x[tex]10^-^5[/tex] M

Ensure you rinse the beaker, funnel, and inside of the volumetric flask with water to avoid contamination. Finally, when adding the last few drops of water to the solution, make sure your eyes are level with the graduation mark to ensure accurate volume measurement.

Questions and Discussion

Answer:

explanation:

1

Answer:

Chemical change

After volcanic eruption the new land will be populated with a large number of organisms called pioneer species. The process is called Primary succession.

The process in which a new land is created or exposed for the first time after volcanic eruption is defined as the primary succession. During this time the lava cools and produces new rocks.

After this first of all the lichens are found to attach themselves to rocks and the plant species which can grow without much soil can appear. Gradually the decomposition of all these plants helps in soil formation.

As a result more and more plants begin to colonize the area. So this land then becomes a fertile land with lot of nutrients and can lead to the formation of forest. Then after secondary succession occurs.

Thus in primary succession the newly formed land has been populated by many living organisms.

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Answer: The muscularis (muscularis externa)

Explanation: please brainliest

the muscle that helps with digestion is a smooth muscle called the tract

Answer:

NH4+

Explanation:

A Lewis base is a substance with the ability to share or give pairs of electrons.

The NH4 + ammonium ion donates a proton, therefore the ammonium ion is a Lewis acid.

The species that cannot act as a Lewis base NH4+.

It refers to a substance like OH- ion where the pair should be donated of non-binding electrons. It should be treated as the electron-pair donor. Also, the one advantage is that it complements the reduction and oxidation of the reaction model. Moreover, it shows the capability for sharing or providing the pair of electrons. Also, NH4+ donated the portion so ammonium ion is a Lewis acid.

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Answer: The answer is C

Explanation:

A bomb calorimeter has a separate chamber to hold substances and can even measure heat gain or loss for reactions that do not occur in water.

The third option is correct.

The following information should be considered:

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To find the mass of 4.50 moles of Ba(NO2)2, you calculate its molar mass using atomic masses and multiply by the number of moles. The result is 1176.03 grams for 4.50 moles of Ba(NO2)2.

To calculate the mass of 4.50 moles of Ba(NO2)2, you first need to find its molar mass by adding the atomic masses of barium (Ba), nitrogen (N), and oxygen (O) from the periodic table. The molar mass of Ba(NO2)2 is calculated as follows:

(1 mol Ba)(137.33 g/mol) + (2 mol N)(14.01 g/mol) + (4 mol O)(16.00 g/mol) = 261.34 g/mol

Then, you multiply the molar mass by the number of moles:

(4.50 moles) × (261.34 g/mol) = 1176.03 grams

Therefore, there are 1176.03 grams in 4.50 moles of Ba(NO2)2.

The net ionic equation is:

[tex]\[ \text{OH}^- + \text{H}^+ \rightarrow \text{H}_2\text{O} \][/tex]

To determine the net ionic equation, we first need to write the balanced chemical equation and then identify the spectator ions.

The given chemical equation is:

[tex]\[ \text{Mg(OH)}_2 + 2 \text{HNO}_3 \rightarrow \text{Mg(NO}_3\text{)}_2 + 2 \text{H}_2\text{O} \][/tex]

To balance the equation:

[tex]\[ \text{Mg(OH)}_2 + 2 \text{HNO}_3 \rightarrow \text{Mg(NO}_3\text{)}_2 + 2 \text{H}_2\text{O} \][/tex]

In the balanced equation, all species are dissolved in water, so we can split them into ions to identify spectator ions.

1. Mg(OH)₂ dissociates into [tex]\( \text{Mg}^{2+} \) and \( 2\text{OH}^- \)[/tex]

2. HNO₃ dissociates into [tex]\( \text{H}^+ \) and \( \text{NO}_3^- \)[/tex]

3. Mg(NO₃)₂ dissociates into [tex]\( \text{Mg}^{2+} \) and \( 2\text{NO}_3^- \)[/tex]

4. H₂O does not dissociate significantly.

So, the net ionic equation is:

[tex]\[ \text{Mg}^{2+} + 2\text{OH}^- + 2\text{H}^+ + 2\text{NO}_3^- \rightarrow \text{Mg}^{2+} + 2\text{NO}_3^- + 2\text{H}_2\text{O} \][/tex]

Cancelling out the spectator ions ([tex]\( \text{Mg}^{2+} \) and \( \text{NO}_3^- \)[/tex]), we get:

[tex]\[ 2\text{OH}^- + 2\text{H}^+ \rightarrow 2\text{H}_2\text{O} \][/tex]

Therefore, the net ionic equation is:

[tex]\[ \text{OH}^- + \text{H}^+ \rightarrow \text{H}_2\text{O} \][/tex]

Answer: A. Physical features

Explanation:

A dichotomous key for identifying organisms primarily uses the physical features of the organisms. The user is required to accurately observe and describe these characteristics to correctly proceed in using the key.

When using a dichotomous key to identify organisms, we primarily look at the physical features of the organisms. A dichotomous key is a tool that allows the user to determine the identity of items in the natural world, such as trees, wildflowers, mammals, reptiles, rocks, and fish. The key presents a series of choices about the characteristics of the unknown organisms; these choices are based on the physical features. The user must accurately observe and describe the physical features in order to correctly proceed in using the key.

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Answer:

both

convex lens

concave lens

both

Explanation:

Answer:

A concave lens is

✔ thinner

in the middle than at the edges, and causes light rays to

✔ diverge

.

A convex lens is

✔ thicker

in the middle than at the edges, and causes light rays to

✔ converge

.

Explanation:

Answer:

insulators

Explanation:

Insulators are any substance which do not let any heat to pass through it. In other words we can say that insulators are bad conductors of heat.

Example of insulators are clothes, woods, plastic

Blacksmiths work with metals which are heated at very high temperature. If the body of blacksmiths comes in contacts of metal with high temperature, they may get severe burn. To avoid any accidents they use clothes and gloves so in case if by mistake they come in contact with high temperature, these clothes and gear do not let let pass through it and protect the body of blacksmith.  

Since these clothes and gloves do not let heat flow through it they belong to the category of insulators.

Answer:

Acid

Explanation:

Vinegar is a dilute form of acetic acid, while HCl is hydrochloric acid and H2SO4 is sulfuric acid. All of these are acids. Hope this helps!

Answer:

acids

Explanation:

Answer:

I’m pretty sure its D. Sweating when you are hot

Answer:

Please Mark as Brainliest!!!!!!!!!!

Explanation:

Increasing pressure is causing a smaller change in gas volume. The closeness of particles of gas and their low speeds allow intermolecular forces to become important at certain pressured and temperature

Answer:

The mass of copper that was heated is 30 g

Explanation:

The formula for the heat supplied, ΔH is;

ΔH = m·c·Δt

Where:

ΔH = Heat supplied = 480 J

m = Mass of the copper sample = Required

c = Specific heat capacity of copper = 0.4 J/(g·°C)

Δt = Change in temperature = T₂ - T₁ = 60° - 20° = 40°C

T₁ = Initial temperature = 20°C

T₂ = Final temperature = 60°C

Therefore, plugging the values, we have;

480 = m×0.4×40

m = 480/(0.4 × 40) = 30 g

The mass of copper that was heated = 30 g.

Answer: 1) HI to increase

Explanation:

Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.This principle states that if there is any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.

[tex]2HI(g)\rightleftharpoons H_2(g)+I_2(g)+energy[/tex]

As the given reaction is exothermic , on increasing the tempearture, the equilibrium will shift in the direction where decrease in tempearture is taking place.So, the equilibrium will shift in the left direction. i.e. towards reactants. Thus amount of [tex]HI[/tex] will increase.

When the temperature of the system increased so it leads the concentration to option 1. HI to increase.

It defines that if any change in the reaction variables so the equilibrium should be shifted in the direction so the impact should be minimized.

Since the given reaction is considered to be exothermic, so in the case when the temperature is increased so the equilibrium should be shifted in the direction that reduced the temperature.

Therefore, the equilibrium should be shifted in the left direction.

Hence the first option is correct.

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Answer:yes

Explanation:Because yes

Answer:

C.

Explanation:

Answer:

124.579 g

Explanation:

Amount of heat required to change the temperature of body is given by the equation given below

Q = m* c * ΔT ____________________equation A

where Q is the total heat energy required by the any object

c is the specific heat capacity of the body J/gK

ΔT is the difference of final temperature of the object and initial temperature of the object

______________________________________

Given Q = 6290 joules

c = 0.900 J/gK

To calculate the temperature in kelvin from Celsius

we can use the formula

K = C + 273

initial temperature  = 23.9°C

initial temperature on kelvin scale =  23.9° + 273 = 296.9

Final temperature  = 80°C

initial temperature on kelvin scale =  80° + 273 = 353

ΔT(temperature difference) = 353 - 296.9 = 56.1

___________________________________________

let the mass of of the  aluminum be m g

substituting the value of Q , c, ΔT in equation A we have

Q = m* c * ΔT

=> 6290 = m * 0.900 * 56.1

=> m = 6290/(0.900 * 56.1 )

=> m = 6290/50.49

=> m = 124.579 g

The mass of the  aluminum is 124.579 g

Taking into account the definition of calorimetry, the mass of the aluminum is 124.58 grams.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is the heat energy that is supplied to a body or an object, causes its temperature to increase without affecting its molecular structure and therefore its phase. In other words, sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

The equation that allows calculating heat exchanges is:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing:

6290 J= 0.9[tex]\frac{J}{gK}[/tex]× m× 56.1 K

Solving:

6290 J= 50.49 [tex]\frac{J}{g}[/tex]× m

6290 J÷ 50.49 [tex]\frac{J}{g}[/tex]= m

124.58 g= m

Finally, the mass of the aluminum is 124.58 grams.

Learn more:

Answer:

Covalent bond

Explanation:

Answer:

C is the answer

Explanation:

Heat energy is transformed into electrical energy.

Answer:

B. Electrical energy is transformed into light energy.