What happened to the moon and earth if the sun did not exist

The pH scale for acids and bases ranges from 0-to 14. Hence, option B is correct.

The potential of hydrogen is a measure of the acidity or alkalinity of a solution equal to the common logarithm of the reciprocal of the concentration of hydrogen ions in moles per cubic decimetre of solution.

pH is a measure of how acidic/basic water is.

The range goes from 0 - to 14, with 7 being neutral.

pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.

Hence, option B is correct.

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Answer:- Ca = +2, S = +6 and O = -2

Solution:- There are certain rules for oxidation numbers. As per the rule, oxidation number of alkaline earth metals in their compounds is +2.

Oxidation number of oxygen in it's compounds is -2(except peroxides) and the sum of oxidation numbers of all the elements of a neutral compound is zero.

Since, Ca is +2 and O is -2, the oxidation number of S could easily be calculated for the given compound as:

Let's say the oxidation number of S in [tex]CaSO_4[/tex] is [tex]x[/tex] . Let's make the algebraic equation and solve it.

[tex]2+x+4(-2)=0[/tex]

[tex]2+x-8=0[/tex]

[tex]x-6=0[/tex]

[tex]x=+6[/tex]

Hence. the oxidation number of Ca is +2, O is -2 and S is +6.

Answer:

Ca = +2, S = +6 and O = -2

Explanation:

EDMENTUM

The answer is; D,

Because these rocks cool slowly, the rocks are able to form large crystals hence giving the rock a coarse texture. These crystals are big enough to be viewed with the unaided eye. The opposite is extrusive rocks that form on the surface of the earth. These cool rapidly and form fine-grained textured rocks because of the small crystals formed during the rapid cooling process.

Final answer:

Large masses of magma that cool very slowly beneath Earth's surface form igneous rocks with a coarse-grained texture, known as intrusive or plutonic rocks, such as granite.

Explanation:

When large masses of magma solidify very slowly far below Earth's surface, they form igneous rocks that have a coarse-grained texture. This slow cooling process allows large mineral crystals to grow, making them visible to the eye. These rocks are known as intrusive or plutonic igneous rocks, such as granite, which is characterized by a proliferation of light-colored minerals in a coarse-grained matrix. In contrast, rapid cooling of magma at or near the surface leads to fine-grained or glassy textures, typical of volcanic or extrusive igneous rocks, like basalt and obsidian.

In summary, the relationship between cooling rates and the grain size of minerals within igneous rocks is a key factor in their classification and subsequent geological interpretation. The development of these textures, whether coarse or fine, reflects the cooling history and mineral composition of the magma from which they are formed. Option D

Answer:- Iron block final temperature is 64 degree C and copper block final temperature is 76 degree C.

Solution:- These problems are based on the formula:

[tex]q=mC_s\Delta T[/tex]

where, q is the heat energy, m is mass, [tex]C_s[/tex] is specific heat and [tex]\Delta T[/tex] is the change in temperature.

mass of iron is given as 1.1 kg. We need to convert it to grams:

[tex]1.1kg(\frac{1000g}{1kg})[/tex]  = 1100 g

q is 13 kJ, let's convert it to J:

[tex]13kJ(\frac{1000J}{1kJ})[/tex]  = 13000 J

[tex]C_s[/tex] of iron is [tex]\frac{0.450J}{g.^0C}[/tex]

Let's calculate change in temperature for iron.

[tex]\Delta T=\frac{13000J}{1100g*\frac{0.450J}{g.^0C}}[/tex]

[tex]\Delta T=26 ^0C[/tex]

Since, [tex]\Delta T[/tex] = final temperature - initial temperature

26 = final temperature - 38

final temperature = 26 + 38 = 64 degree C

So, The final temperature of iron block would be 64 degree C.

Let's do the same calculations for copper block, it's mass is 890 g and specific heat is [tex]\frac{0.385J}{g.^0C}[/tex] .

[tex]\Delta T=\frac{13000J}{890g*\frac{0.385J}{g.^0C}}[/tex]

[tex]\Delta T=38 ^0C[/tex]

Now, calculations for final temperature:

[tex]\Delta T[/tex] = final temperature - initial temperature

38 = final temperature - 38

final temperature = 38 + 38 = 76 degree C

So, the final temperature of copper block is 76 degree C.

The final temperature of the iron block will be 64.1 °C,  

The final temperature of the copper pellet will be 76.0 °C after 13 kJ of heat is transferred to each.

This assumes no heat loss to the surroundings.

To solve this, we use the formula:

q = m * Cs * ΔT

Where q is the heat transferred, m is the mass, Cs is the specific heat capacity, and ΔT is the change in temperature.

For the iron block:

Rearranging the formula to solve for ΔT:

ΔT = q / (m * Cs)

ΔT = 13,000 J / (1100 g * 0.450 J/g°C) ≈ 26.1 °C

The initial temperature is 38 °C, so the final temperature will be:

38 °C + 26.1 °C = 64.1 °C

For the copper pellet:

Similarly, solving for ΔT:

ΔT = q / (m * Cs)

ΔT = 13,000 J / (890 g * 0.385 J/g°C) ≈ 38.0 °C

The initial temperature is 38 °C, so the final temperature will be:

38 °C + 38.0 °C = 76.0 °C

The tool that is used to measure object's mass is electronic balance. The correct option is D.

An electronic balance is a device used to accurately measure the weight of materials. Electronic balances are important laboratory instruments for precise measurement of chemicals used in various experiments.

A laboratory electronic balance provides a digital measurement result. Thermometer is the one that is used to measure temperature.

Digital scales are generally more accurate than mechanical ones. However, for the most accurate reading, any bathroom scale must be properly set up and used consistently.

A graduated cylinder is a piece of laboratory equipment used to measure the volume of liquids, chemicals, or solutions during the course of a day's work in the lab.

A meter stick is a measuring device that measures one meter (one hundred centimeters) and is used to measure things in meters and centimeters.

Thus, the correct option is D.

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The answer to your question is,

B. Streak

-Mabel <3

A. C. and D. do not have anything to do with colours.

The answer to your question is B. Streak is a line that differs from its surroundings by its colour.

Hope it helped,

BioTeacher101

Explanation:

Funding from the government greatly affects the scientific research as a research can take number of years to complete. During this time period lot of financial support is required as there might be lot of expensive chemicals or substance that the scientist requires for his research.

So, for an individual it is not possible to continue his research without any financial support or huge bank balance.

Also, government can provide better labs and other resources like good equipments, costly or rarely available chemicals or compounds etc.

There are so many diseases for whom there are no medicines. So, with the help of government funding lots of other medicines can be discovered for the benefit of people and development of nation.  

Answer:

Scientists have to follow governmental rules made to protect people.

Explanation:

Hello there!

First you had to multiply by the density by the volume since D=M/V. Please make sure when your units has the same thing and it should be cancel it out.

2.3g/mL*30 mL= 69L is the right answer.

Hope this helps!

Thank you for posting your question at hereon Brainly.

-Charlie

The mass of a liquid is determined by multiplying its volume by its density. Given the density of 2.3 g/mL and the volume of 30 mL, the mass of the liquid is 69 g.

The mass of a liquid can be ascertained by multiplying its volume by its density. This is due to the relationship: mass = volume x density. Given the density of the liquid is 2.3 g/mL and the volume is 30 mL, we calculate the mass as: mass = volume x density = 30 mL x 2.3 g/mL = 69 g. Hence, the mass of the liquid is 69 g.

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the answer is A......

it is supported by practical evidence and examples. this is the answer because he tried and tested many different ways to see what would happen so he is happy with the conclusion that what he tested is what he gets.

The correct answer is A.

The likely irreversible effect on the ecosystem from cutting down sections of the forest to build new homes is a decline in the deer population.

If humans cut down a few sections in the middle of the forest to build new homes, the likely effect on the ecosystem that could be irreversible is that there will be fewer deer. When their habitat is destroyed, deer may lose their food sources and shelter, leading to a decline in their population. This can have cascading effects on the entire ecosystem, affecting other organisms that depend on deer for food or as predators.

Final answer:

The irreversible effect of cutting down sections of forest for home construction is likely the extinction of certain species, such as wolves, due to habitat fragmentation and loss.(Option B)

Explanation:

If humans cut down a few sections in the middle of the forest to build new homes, a likely irreversible effect on the ecosystem could be that the wolves could die out. Deforestation leads to habitat loss, which not only impacts individual species such as wolves, who may lose their prey and shelter but also triggers a cascade of effects on the biodiversity and the food web.

The drastic reduction in the population of a species, like certain species of deer due to hunting, can have far-reaching consequences on the ecosystem, altering predator-prey relationships and leading to potential species extinction. Large predators such as wolves are particularly vulnerable when their territories and prey populations become fragmented and diminished. Furthermore, habitat destruction is a primary driver of biodiversity loss worldwide, and when it occurs, the changes can be profound and permanent, given that ecosystems take centuries or longer to naturally restore themselves, if at all.

firstly we need to calculate the number of moles of 34.0 g CO.

mole = mass/relative molecular mass = 34/(12+16) = 1.214 mol

CO : CO2 = 2 : 2 = 1 : 1

so that number of moles of CO2 = number of moles of CO = 1.21 mol

then use the number of moles to calculate the mass

mass = mole * relative molecular mass = 1.21 * 44 = 53.4 g

so choose A

The stoichiometric principle allows us to convert the given grams of CO into grams of CO2 using the balanced equation and molar masses. This conversion process yields 53.2 grams CO2. The closest answer according to the choices given is 53.4 g CO2 (option a).

This problem is a stoichiometry problem in Chemistry. The balanced equation gives us a molar ratio of 2:2 (CO to CO2). First, let's convert the grams of CO to moles using the molar mass of CO (CO = 28 g/mol). Then, we multiply the moles of CO by the molar ratio to get moles of CO2. Last, we convert the moles of CO2 to grams of CO2 using the molar mass of CO2 (CO2 = 44 g/mol).

The final answer is 53.2 g CO2, but since the numbers in the answer choices are nor exactly accurate, the closest answer will be 53.4 g CO2 (Option a).

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The rows are the one line of elements that goes from left to right horizontally. A column is a line of elements that goes vertically.

Percent error is the difference between the measured and known value, divided by the known value, multiplied by 100%.

So first, we take our measured value, .299 cm, minus our known value, .225 cm.

.299 cm - .225 cm=.004 cm

Next, we divide that by our known value

[tex]\frac{.004}{.225}=.0177777778[/tex]

Finally, multiply your answer by 100

.0177777778 x 100= 1.77777778 %

Round to three significant figures, and you're done.

=1.78 % error

Final answer:

The percentage error in the length measurement of 0.229 cm, with the correct value being 0.225 cm, is calculated to be 1.78%.

Explanation:

To calculate the percentage error of a length measurement, you can use the formula:

Percentage Error = (|Measured Value - True Value| / True Value) × 100%

Using the given values, where the measured value is 0.229 cm and the true value is 0.225 cm, the percentage error is calculated as follows:

Percentage Error = (|0.229 cm - 0.225 cm| / 0.225 cm) × 100%
                = (0.004 cm / 0.225 cm) × 100%
                = 0.0178... × 100%
                = 1.78%

Therefore, the percentage error in the length measurement is 1.78%.

The stored energy of an object is kinetic energy

Answer: potential

Explanation: because kinetic is when a object is in motion

Each type of electromagnetic radiation have been matched to their descriptions as follows:

Ultraviolet light A) Given off by very hot objects, such as the sun

Gamma rays B) Given off by radioactive substances  

Microwaves C) Used in radar and to heat food

X‒rays D) Used in the medical field to see bone structure

Gamma rays - B) Given off by radioactive substances

Microwaves - C) Used in radar and to heat food

Ultraviolet light - A) Given off by very hot objects, such as the sun

X-rays - D) Used in the medical field to see bone structure

Gamma rays are a type of electromagnetic radiation emitted by radioactive substances. They have high energy and can penetrate deep into materials, making them useful in various applications such as medical imaging, cancer treatment, and industrial inspections.

Microwaves are a type of electromagnetic radiation used in radar systems for communication and navigation. They are also used in household microwave ovens to heat food by causing water molecules in the food to vibrate and generate heat.

Ultraviolet light is electromagnetic radiation with higher energy and shorter wavelengths than visible light. It is emitted by very hot objects, such as the sun. Ultraviolet light has various effects on living organisms and can cause tanning, sunburn, and vitamin D production in humans.

X-rays are a type of electromagnetic radiation with higher energy and shorter wavelengths than ultraviolet light. They are commonly used in the medical field for imaging and diagnostics, allowing doctors to see the internal structures of the body, including bones and soft tissues.

Each type of electromagnetic radiation has unique properties and applications, making them valuable in different fields of science, technology, and medicine. Understanding these different types of radiation is essential for their safe and effective use in various applications.

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Hey there!

weak acid = HA

is titrated with NaOH

then :

V = 23.25 mL of weak acid

V = 50 mL base, M = 0.1 M base

pH= 10.50

find original solution of acid :

mmol of base initially = MV = 0.1*50 = 5

mmol of acid added = let it be "x"

After addition  :

mmol of base left = 5-x

from pH  :

pOH = 14-pH = 14-10.50 = 3.5

[OH-] = 10^-pOH = 10^-3.5 = 0.0003162 M left

V total = 23.25 + 50 =  73.25mL

mmol of OH- left = MV = 73.25*0.0003162 = 0.023161

Then  :

mmol of acid added = (5-0.023161) = 4.976839

mmol of acid added was = 4.976839

[HA] = mmol of aid/Vadded

= 4.976839 / 23.25 = 0.21405 M

[ HA ] = 0.21405 M

Hope that helps!

Answer:

Explanation:

           2C₈H₁₈ + 25O₂    →  16CO₂   +  18H₂O

The reaction above is a typical combustion reaction which are very common with hydrocarbons. Combustion occurs in the presence of oxygen to product carbon dioxide and water. The purpose of this reaction is to transform chemical energy into useful heat energy. Most times, the oxygen used is always in excess of the hydrocarbon reacting with it.

The balanced equation 2C8H18 + 25O2 → 16CO2 + 18H2O represents a combustion reaction where the octane fuel reacts with oxygen to produce carbon dioxide and water.

The type of chemical reaction given by the balanced equation 2C8H18 + 25O2 → 16CO2 + 18H2O is a combustion reaction.

In a combustion reaction, a substance combines with oxygen to produce carbon dioxide and water vapor. In this case, the octane fuel (C8H18) reacts with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). The balanced equation shows the stoichiometric ratio of all the reactants and products.

This type of reaction is commonly seen in the burning of fossil fuels, such as gasoline, where a hydrocarbon combines with oxygen to release energy.

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By applying Charles's Law (V1/T1 = V2/T2), we can calculate that the volume of a sample of gas, which originally occupied 32.0 cm³ at 189K, would expand to approximately 40.9 cm³ at 242K.

The volume of a sample of gas changing with temperature is explained by Charles's Law, which states that, at a constant pressure, the volume of a gas is directly proportional to its absolute temperature. In this case, you are given an initial volume (V1) of 32.0 cm³ at an initial temperature (T1) of 189K, and you need to find the final volume (V2) at a final temperature (T2) of 242K.

Using Charles's Law (V1/T1 = V2/T2), you can plug in the given values and solve for V2:

V2 = (V1 * T2) / T1

= (32.0 cm³ * 242K) / 189K

= approximately 40.9 cm³

So, the sample of gas would occupy a volume of approximately 40.9 cm³ at 242K, assuming constant pressure.

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Answer:

The correct answer is in the presence of a base.

Explanation:

Phenolphthalein is a pH indicator, which is generally colorless, however, it changes from pink to purple when encounters with the alkaline solutions. The compound phenolphthalein functions in a distinct way as it is colorless naturally, however, it turns from pink to dark pinkish color in alkaline solutions. Throughout the range of acidic pH levels, the compound stays colorless, however, it starts to turn pink at the pH of 8.2, that is, basic, and goes towards the bright purple color in stronger alkalines.

Answer:- [tex]Ra(OH)_2[/tex] and CsOH .

Explanations:-  [tex]Ra(OH)_2[/tex] and CsOH have [tex]OH^-[/tex]  and so when dissolved in water, they give [tex]OH^-[/tex] and hence they are bases.

[tex]H_2C_2O_4[/tex] and HI gives [tex]H^+[/tex] when dissolved in water and so these are acids.

The equations are shown as below:

[tex]Ra(OH)_2(aq)\rightarrow Ra^2^+(aq)+2OH^-(aq)[/tex]

[tex]CsOH(aq)\rightarrow Cs^+(aq)+OH^-(aq)[/tex]

[tex]H_2C_2O_4(aq)\rightarrow 2H^+(aq)+C_2O_4^2^-(aq)[/tex]

[tex]HI(aq)\rightarrow H^+(aq)+I^-(aq)[/tex]

Final answer:

Out of the given compounds, Ra(OH)₂ and CsOH behave as bases by releasing hydroxide ions when dissolved in water, while H₂C₂O₄ and HI act as acids.

Explanation:

In the context of acids and bases in water, compounds that behave as bases are those that release hydroxide ions (OH−) when dissolved in water. Among the given compounds, Ra(OH)₂ and CsOH are the ones that act as bases in aqueous solutions.

Ra(OH)₂ is a compound of an alkaline earth metal (radium) with hydroxide and is considered a strong base, although not very soluble. When it does dissolve, it dissociates to yield Ra²+ and hydroxide ions.

CsOH, on the other hand, is a hydroxide of an alkali metal (cesium) and is a strong base, fully dissociating in water to provide Cs+ and OH− ions.

The compound H₂C₂O₄ (oxalic acid) acts as an acid by donating protons (H+) and HI (hydroiodic acid) is a strong acid that fully dissociates to provide H+ ions in solution.

Hey there!:

The reaction is as follows:

N2(g)+ 3 H2(g) ⇌ 2 NH3(g)

At equilibrium, the concentrations of the different species are as follows.:

[NH3] = 0.105 M

[N2] = 1.1 M

[H2] = 1.50 M

The equilibrium constant for the reaction is given as follows:

Keq = [NH3]² / [N2] [H2]³

Keq = (0.105)² / [1.1] [1.50]³

Keq = 0.00296 or 0.0030

The equilibrium constant for the reaction at this temperature is 0.0030.

Hope that helps!

Answer:

A

Explanation:

beryllium, iron,gold most brittle to least :) hop this helped

Answer:

The answer is option 1, Beryllium.

Explanation:

In precision farming, solutions or alternate actions are determined by the Decision Support System (DSS) principle of data-driven decision making, using real-time data from sensors and other sources to optimize farming practices.

In precision farming, the Decision Support System (DSS) principle that determines solutions or alternative actions is mainly guided by the principle of data-driven decision making. This involves the collection, analysis, and interpretation of real-time data gathered from various sources such as sensors, satellite images, and drones. The goal is to make informed decisions that optimize resources, maximize yields, and reduce environmental impact.

Data analytics and algorithms help farmers predict outcomes based on current conditions. For instance, a DSS might suggest the optimal amount of water and fertilizer needed for a specific crop, considering the weather forecasts, soil conditions, and plant health. By integrating with Geographic Information Systems (GIS), the DSS helps to create variable-rate application maps that facilitate the precise distribution of inputs in the farm field.

Overall, the principle of leveraging accurate and up-to-date information to inform farming practices is central to precision agriculture and empowers farmers to tailor their strategies to the specific needs of each area within their fields.

it would be liquid moves but never bounces off(evaporates)

Answer:

liquid

Explanation: lets eliminate answers

first,it can be gas cuz gases bounce off

it cant be solid cuz they dont move they just vibrate

it cant be plasma cuz plasma molecules bounce apart and when the molecules seed up they bounce apart.  

therefore it is  liquid cuz they move around and dont bounce off

i also got this right on my flvs science test