The graph shows the changes in the phase of ice when it is heated.
Phase Change of Ice

Which of the following temperatures describes the value of C? (4 points)
100 °C, because it is the melting point of ice.
Oь
100 °C, because it is the boiling point of water.
Ос
Less than 100 °C, because Crepresents the temperature at which ice melts.
Od
Less than 100 °C, because Crepresents the temperature at which water evaporares.

Answer:

Explanation:

We know that

pH +pOH = 14

Given pH = 8.30

⇒ p0H = 14-8.30 = 5.70

Since, we know that

[tex]10^{-pH} = [H^{+}][/tex]

Answer:

The amount of CO2 released by humans has increased over the

last 200 years.

Hope it helps!!!

Answer:

A. The amount of CO2 released by humans has increased over the

last 200 years.

Answer:

A liquid-fueled rocket has two liquids (liquids are good because of the density, they need less space than a gas to be stored), such that these liquids are called the fuel and the oxidizer.

These liquids are injected into a system that leads to a combustion chamber, where the liquids are mixed (we need to mix the fuel with the oxidizer to enable the combustion of the fuel) and burned to produce thrust.

Some common examples of oxidizers are liquid oxygen, which may be combined with fuels like liquid hydrogen, liquid methane, kerosene and hydrazine.

Other oxidizers are liquid fluorine (which also can be combined with the fuels liquid hydrogen and hydrazine), nitrogen tetroxide (which can be combined whit kerosene, hydrazine and other fuels) and FLOX-70, which can only be combined with kerosene.

The "most commonly used" may depend on the country and the type of liquid propellant ( petroleum, cryogens, and hypergols)

Such that the most common oxidizer may be liquid oxygen, and the most common fuel the kerosene.

Answer:

88g of Sr(NO3)2 are present

Explanation:

To solve this question we must, as first, find the moles of oxygen. Based on the chemical formula of strontium nitrate, there are 6 atoms of oxygen per mole of strontium nitrate. Thus, we can find the moles of strontium nitrate and its mass as follows:

Moles Oxygen:

40g * (1mol / 16g) = 2.5 moles Oxygen

Moles Strontium nitrate:

2.5 moles Oxygen * (1mol Sr(NO3)2 / 6mol O) = 0.4167 moles Sr(NO3)2

Mass (Molar mass Sr(NO3)2: 211.63g/mol)

0.4167 moles Sr(NO3)2 * (211.63g / mol) =

Answer:

its B

Explanation:

I took the test and its that passage way thing. (tell me if this works for you! it will but just wanna make sure!)

Answer:

Chemical reactions list reactants and products in molar amounts, not just molecular amounts. We can use the coefficients of a balanced chemical equation to relate moles of one substance in the reaction to moles of other substances

Explanation:

Answer:

True

Explanation:

Competition is the act of competing with one another for a particular resource. An example is two animals quarrelling over a food or two people quarreling over who lost their money. Competing is a type of rivalry in which two people compete for one resource. The answer for this question is True.

The answer is TRUE. Competition is rivalry between individuals for a particular resource

Competition amongst individuals?

Competition can be described as an interaction between two individuals in which they both fight for the available resources in the environment.

For example, when there is limited source of food and water in an environment, the individuals or organisms present will struggle to take the available food in order to survive while those individuals that were unable to get this resource might end up dead as the available food is limited.

This also occurs in plants and they also compete for sunlight, food, water.

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Answer:

Fossil fuels..........

Answer: Electricity

Answer:

J.J Thomas in 1897

Answer:

false

Explanation:

there are more than 2 forces of nature that change the environment and landforms

Answer:

20L

Explanation:

molar concentration = moles of solute ÷ volume of solution

⇒ 0.5 = 10 ÷ volume

⇒ volume = 10 ÷ 0.5 = 20L

Answer:

Explanation:

moles = mass/molar mass

10 = mass/(1.016 + 35.453)

10 = mass/ 36.469

36.469 * 10 = mass

3646.9 g = mass

molarity = moles/volume

0.5 = 3646.9/volume

0.0001371 = volume

Answer:

19ml

Explanation:

trust me

Answer:

D. The energy level of the electron.

Explanation:

There are four quantum numbers which are used to describe the movement and paths or positon of each electron within an atom. Quantum numbers can be used to determine the electronic configuration of atoms and the most likely location of the atom's electrons. Quantum numbers are also used in determining other characteristics of atoms, such as ionization energy and the atomic radius.

The four quantum numbers are namely, principal, azimuthal, magnetic and spin quantum numbers.

Principal quantum numbers are denoted by the symbol ‘n’. They describe the principal electron shell or energy level the atom.The value of the principal quantum number are positive integer values that is equal to or greater than one. The value n = 1 represents the innermost electron shell of an atom, which corresponds to the lowest energy state of an electron. The larger the values of 'n' the greater the energy level and the farther the electron is from the nucleus.

Answer:

The Sun

Explanation:

Solar power is energy from the sun that is converted into thermal or electrical energy.

Answer:

The sun

Explanation:

The sun is the main source of solar energy.

Answer:

It would take 13 minutes.

Explanation:

The temperature decreases at a linear rate, meaning that we can describe the process by using the following formula:

Where T₂ is the final temperature, T₀ is the initial temperature; and t is the elapsed time in minutes.

We input the data given by the problem:

And solve for t:

Answer:

the answer is b edg 2021

Explanation:

it just is

Answer:

79.89%

Explanation:

Copper has a molar mass of 63.55

Oxygen has a molar mass of 16.00

If you add these you get 79.55

To get the mass percent of copper divide copper by the whole. 63.55/79.55*100= 79.89%

Answer:

1) 90.0 mL

2) 11.25 M

3) 0.477 M

4) 144 mL

Explanation:

The main formula that will be used for all these calculations is:

                                                     C₁V₁ = C₂V₂

C stands for concentration and V stands for volume and the subscripts 1 and 2 indicate an initial concentration or volume and a final concentration or volume.

For each problem, it's best to start by figuring out what you have and what you need to find. Figure out if you're looking for an initial value or a final value.

1) We need to find the initial volume. So, take what values you have and plug them in and then solve for whatever variable:

5.00 M · V₁ = 500.0mL · 0.900 M                        - divide by 5.00

C₁ = 90.0 mL

2) This time we're finding the initial concentration:

20.0mL · C₁ = 150.0mL · 1.50 M                          - divide by 20.0mL

C₂ = 11.25 M

3) Now we're finding the final concentration:

12.00mL · 3.50 M = 88.0mL · C₂                         - divide by 88.0mL

C₂ = 0.477 M

4) Finally, we're looking for the final volume:

9.0mL · 8.0 M = 0.50 M · V₂                                - divide by 0.50 M

V₂ = 144mL

Answer:

126 g of H₂O

Explanation:

Firstly, we complete the equation:

2H₂  +  O₂  →  2H₂O

If we have 7 moles of hydrogen, we assume, the oxygen is in excess.

Ratio is 2:2.

2 moles of hydrogen can produce 2 moles of water

Then, 7 moles of H₂ must produce 7 moles of water.

We convert moles to mass → 7 mol . 18 g/mol = 126 g

Answer:

1 melting

2

3 evaporationa

4 freezing point

The phase of the following are:

1. Melting.

2. Condensation.

3. Evaporation

4. Freezing point.

When any substance change from solid state to liquid state, it is called melting.

Ice change into water is an example.

Condensation is a process in which the air is cool down and convert into liquid from, like dew.

Water drops outside cold water bottle is an example.

Evaporation is the opposite of condensation, in which the liquid become so hot that it change into gaseous form.

Water turns into vapor in hot temperature.

Freezing point is when liquid is converted into solid.

Water converted into ice in fridge is an example.

Thus, The phase of the following are:1. Melting., 2. Condensation., 3. Evaporation., 4. Freezing point.

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Answer:

3Sn(s04)2

Explanation:bc it cant be anything else

2Fe(No2)3

Explanation:

by multiplying 2×3 we get 6

then 2×6 so we get 12 atoms of o

Answer:

B.) Lobbying for policy changes

The Alliance to Save Energy seeks to increase energy efficiency through lobbying for policy changes and the correct option is option B.

The Alliance to Save Energy (ASE) is a nonprofit organization formed by industrial, technological, environmental and consumer leaders. It promotes energy efficiency across the world through research, education and advocacy.

Their mission is to improve energy productivity by:

Therefore, The Alliance to Save Energy seeks to increase energy efficiency through lobbying for policy changes and the correct option is option B.

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Answer:

Ocean acidification

Explanation:

Ocean acidification is the progressive decrease in the pH of the oceans on Earth as the increasing amount of carbon dioxide CO₂ in the atmosphere which is due mainly to fossil fuel combustion, is dissolved into the oceans

Carbonic acid is formed when carbon dioxide, CO₂, in the atmosphere is dissolved in the ocean water to form carbonic acid as follows;

CO₂ + H₂O → H₂CO₃

H⁺(aq) ⇄ HCO₃⁻ (aq)

According to L e C h a t e l i e r ' s an increase in the amount of carbon dioxide in the atmosphere will result in more CO₂ dissolving into the oceans and forming more carbonic acid, HCO₃⁻ (aq), thereby increasing the acidity of the oceans which is equivalent to a reduction in the pH of the ocean waters.

Answer:

B: reflecting

Explanation:

Sound waves can bounce off smooth

Answer:

adding an acidic solution

Explanation:

Strong acids dissociate completely in water and the H⁺ ions react with the OH⁻ ions to make H₂O. If we add an acid to our solution of Ca(OH)₂, the acid protons would react with some of the OH⁻ ions and drive the equilibrium to the right. More of the solid Ca(OH)₂ should dissolve.

The functional groups which are found in the molecules are responsible for their chemical reactions. Here the first organic compound is an acid, second one is an ether, third one is an alkyl halide and the fourth is an primary amine.

The functional groups in the field of organic chemistry can be defined as the substituent atoms or groups of atoms which are attached to the specific molecules. They have distinct features and properties and they are independent of the molecules they are attached to.

The compound with the functional group R-COOH is acid, R-O-R¹ is ether, R-X and R-NH₂ is a primary amine.

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Answer:

b

Explanation:

i took the quiz