HELP ASAP Describe how transferring energy into the substance affected the speed of the molecules. (Amplify science)

Answer:

When electrons move to a lower energy level.

Explanation:

Compare the pure water and coffee : Their pH differs by approximately 2 pH units. Compare pure water and milk of magnesia. their pH differs by approximately 3 pH units.

On the Comparison of the pure water and the coffee. Their pH will differs by the approximately 2 of the pH units, which means that the water has 100 times fewer the hydrogen ions than coffee.

Now compare the pure water and the milk of the magnesia. Their pH will differs by the approximately 3 pH of units, which means that the water has the 1000 times more hydrogen ions than the milk of magnesia.

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Answer:

-4

Explanation:

The overall negative charge in the formula Ti*O2 which contains 2 oxide ions, each with a -2 charge, is -4.

The total negative charge can be calculated by adding up the charges of all the oxide ions:

2 oxide ions x -2 charge/ion = -4

So, the overall negative charge in the formula Ti*O2 is -4.

Answer:

Ethyl cinnamate

Explanation:

For this question, we have to start with the IR info. If we have a peak at 1710 this indicates the presence of a carbonyl group in the molecule (C=O). Additionally, if we calculate the I.H.D (index of hydrogen deficiency), we will have a value of "6". We already know that we have a C=O group, so, this counts for 1 of the 6 additionally, we can have a benzene ring so, this counts for 4, so far we have 5. Finally, we will have a double bond outside of benzene and we will have a total of 6, so:

Benzene: 4

Carbonyl group: 1

Double bond: 1

For a total of six (that fits with the I.H.D calculation). So, so far we know that we have a benzene ring, a double bond, and a carbonyl group. In the formula we have 2 oxygens, therefore we can have a carboxylic acid or an ester. In this case, the IR info doesn't give any additional info, so our best option is the ester group.

The 1H NMR info give is:

Signal A= 1.3 (3 H, triplet)

Signal B= 4.3 (2 H, quartet)

Singal C= 6.5 (1 H, doublet)

Signal D= 7.4-7.6 (5 H, multiplet)

Signal E= 7.7 (1 H, doublet)

The molecule that fits with this NMH spectrum and the info given by the I.H.D is "ethyl cinnamate".

See figure 1

I hope it helps!

Answer:

they bonding

Explanation:

dfffffffffffffff

Two ways in which scientists can exhibit ethical behavior are

Science can simply be defined as an intellectual and proven practical activity encompassing the systematic study of the structure and behaviour of the physical and natural world through observation and experiment.

So therefore, two ways in which scientists can exhibit ethical behavior are

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Batteries, natural gas, and coal are all chemical energy

The process of catalysis  which involves adding a catalyst  to a chemical reaction, increases the rate of the reaction.

Thus, Catalysts are not destroyed during the reaction and are unaffected by it. Very tiny amounts of catalyst are frequently sufficient when the reaction is swift and the catalyst recycles quickly; mixing, surface area, and temperature are key factors in reaction rate.

In order to regenerate the catalyst, it usually reacts with one or more reactants to produce intermediates that then give off the ultimate reaction product.

Homogeneous catalysis, in which all of the components are dispersed in the same phase as the reactant (often a gas or liquid), and heterogeneous catalysis, in which the components are not.

Thus, The process of catalysis  which involves adding a catalyst  to a chemical reaction, increases the rate of the reaction.

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Answer:

The Barbary sheep, also known as the aoudad, is a unique species that's adapted to life in the rugged terrain of North Africa. These sheep have a thick coat of fur that allows them to stay warm in the harsh mountain climate. They also have strong legs that help them climb steep inclines and rocky outcroppings.

As an animal, the Barbary sheep is of scientific interest for a variety of reasons. Here are a few examples:

Habitat and ecology: Barbary sheep have adapted to a range of habitats, from arid deserts to mountainous terrain. They are well-suited to hot and dry climates and have a range of adaptations that help them survive in these conditions. Studying these adaptations can help scientists understand how animals cope with extreme environments.

Social behavior: Barbary sheep are social animals that live in groups called bands. They have a hierarchical social structure, with dominant males leading the group and mating with multiple females. Studying this social behavior can provide insights into the evolution of social systems and the factors that influence reproductive success.

Reproductive biology: Barbary sheep are polygynous, meaning that males mate with multiple females. They have a seasonal breeding pattern, with mating occurring in the fall and early winter. Studying the reproductive biology of Barbary sheep can help scientists understand the factors that influence reproductive success and the evolution of mating systems.

Genetics: The Barbary sheep is of interest to geneticists because it is a species that has undergone recent divergence. There are several subspecies of Barbary sheep, each with distinct genetic traits. Studying the genetic diversity of Barbary sheep populations can provide insights into the factors that drive speciation and the genetic basis of adaptations.

In terms of their biology, Barbary sheep are part of the Bovidae family and are closely related to goats and sheep. They have a complex digestive system that allows them to extract nutrients from tough plant material that other animals can't digest. They are also highly adaptable and can survive in a variety of habitats, from dry deserts to snowy mountain peaks.

In order to study Barbary sheep, scientists use a variety of methods such as field observations, tracking, and genetic analysis. By studying these animals, researchers can gain a better understanding of their behavior, ecology, and genetics. This knowledge can then be used to develop conservation strategies and management plans to help ensure the survival of this unique species.

Explanation:

Explanation:

When doing a replacement reaction, one should keep in mind the valence shell of the atoms in the reactions.

Answer:

The complete equation for the neutralization reactions for the LiOH + HNO₂ is as :

LiOH  +  HNO₂ ---->  LiNO₂  +  H₂O

The Neutralization reaction is the reaction as in the chemical reaction in which the acid will reacts with the base and to produce the salt and the water molecule. The general equation of the chemical reaction is as :

HX  +  BOH  -->  BX  + H₂O

The reaction with the LiOH and the HNO₂ is :

LiOH  +  HNO₂ ---->  LiNO₂  +  H₂O

There is the combination of the H⁺ ions and OH⁻ ions that will form the water.

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The specific heat of the metal can be calculated using calorimetric equation. The specific heat of the metal here is 0.61 J/g °C.

The specific heat capacity of  substance is the heat energy required to raise its temperature by one degree Celsius per one gram  of the substance.

The calorimetric equation connecting the heat energy q, mass m, specific heat c and temperature difference ΔT is:

q = m c  ΔT

Here, the heat released from the metal is equal to the heat absorbed by water.

Therefore,

q metal = q water. Let c  be the specific heat of the metal.

25 g  × ( 99 - 20.15°C) ×c = 50 g  × ( 20.15°C- 14.33) × 4.18 J/g °C

                                         = 1217.5 J

Then c = 1217.5 J/25 g  × ( 99 - 20.15°C)  = 0.61 J/g °C.

Therefore, the specific heat of the metal is 0.61 J/g °C.

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The amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C is 33,440 Joules.

To find the amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C, we can use the equation Q = mcAT.
First, we need to find the value of m, which is the mass of the water in grams. In this case, it is given as 200 grams.
Next, we need to find the value of AT, which is the change in temperature in degrees Celsius.

This can be calculated by subtracting the initial temperature from the final temperature, which gives us 60 C - 20 C = 40 C.
The specific heat capacity of water, C, is given as 4.18 Joules per gram per degree Celsius.
Now we can plug in the values into the equation:
Q = mcAT
Q = (200 g) x (4.18 J/g°C) x (40°C)
Q = 33,440 J
Therefore, the amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C is 33,440 Joules.

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Answer:

45.0

Explanation:

Using the rules of rounding, we can round 44.981 to 45. We need that third sig fig though, so we add the trailing zero

The value 44.981 g to three significant figures is 45.0 g.

Significant figures, also known as significant digits, are the digits in a number that carries meaning in terms of precision and accuracy. They indicate the certainty or reliability of a measurement or calculated value.

To round the value 44.981 g to three significant figures, follow the rules for significant figures:

Identify the three most significant digits in the number. They are 4, 4, and 9.

Look at the digit immediately after the third significant digit. If it is 5 or greater, round up; if it is less than 5, round down.

In 44.981 g, the digit immediately after the third significant digit (9) is 8. Since 8 is greater than 5, round up.

Therefore, rounding 44.981 g to three significant figures gives us:

45.0 g.

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Answer:

2Al+3FeO→Al2O3+3Fe

Explanation:

Basically, to get this answer, you need to balance the amount of Aluminum to the ammount on the other side which is 2 so you need 2 Al to balance the reaction correct, next you move on to the amount of Oxygen in the reaction, there are three Oxygen’s on the right and one on the left, so you need 3 FeO in order for the Oxygens to be balanced. Now that the Iron is unbalanced on both sides, you need 3 Fe (on the right) in order for the equation to be balanced.

The balanced chemical reaction is \(2Al+3FeO\) → \(Al_2O_3+3Fe\)

A balanced chemical equation occurs when the number of atoms involved on the reactants side is equal to the number of atoms on the products side.

To balance a reaction means to make the number of atoms the same on both the reactants and products sides. To do so, coefficients need to be added to the chemical equation.

Hence, the balanced the chemical reaction is \(2Al+3FeO\) → \(Al_2O_3+3Fe\).

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Mn(s) metal will spontaneously react with Zn²⁺(aq), but will not

spontaneously react with Mg²⁺ (aq)

The Eo value of an electrochemical cell determines its spontaneity. Positive Eo electrochemical cells are spontaneous, and vice versa.

The relevant Eo of the half-cell in this instance are as follows for Mn(s) metal

Zn2+/Zn = -0.763v for Eo

2.37v for Eo Mg2+/Mg.

Mn2+/Mn = -1.18v for Eo.

Consequently, the equation for an Eo cell (with Zn as one of the half-cells) is: Eo Zn2+/Zn - Eo Mn2+/Mn = -0.763 - (-1.18) = 0.417v.

On the other hand, the equation for an Eo cell (with Mg as one of the half-cells) is: Eo Mg2+/Zn - Eo Mn2+/Mn = -2.37 - (-1.18) = -1.19v.

As a result, Mn(s) metal will spontaneously react with Zn2+(aq), but not with Mg2+ (aq)

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Answer: 40. g

Explanation:

To find the grams in 0.89 moles of CO2, we just need to use the molar mass of CO2. The molar mass which tells us how many grams are in a mole for an element or compound.

The molar mass of CO2 is equal to the molar mass of carbon, 12.0107, and 2 oxygens, 2*15.9994 (you can find the molar mass of an element on any periodic table). Add these, and you get the molar mass of CO2 to be 44.01 g/mol, a helpful value to remember.

Now, just multiply the molar mass by the amount of moles to find grams.

\(\frac{44.01g}{mole} * 0.89mole\), moles cancel out, \(\frac{44.01g}{mole} * 0.89mole=40.48g\)

There are 2 significant figures in the question, so I will round this answer to 2 significant figures, 40. g

A substance's cooling curve is a graph representing the change in temperature over time as it is allowed to cool. The gradient of the cooling curve is influenced by the heat capacity, thermal conductivity, and ambient temperature of the material. The correct option is A.

The rate of cooling for a sample with a known composition is measured in order to map the phase boundaries on a phase diagram. As the sample (or some piece of it) starts to go through a phase change, the rate of cooling will alter. When the temperature-time curve changes slope, these "breaks" will be visible.

In the cooling curve, the graph never meet with the time axis.

Thus the correct option is A.

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Answer:

it's A. Grams

Answer:

fluorine is the most electronegative element

When sodium hydroxide is dissolved in water within a beaker, it is observed that the beaker becomes warm due to chemical reaction.

A chemical reaction is a type of reaction that involves the rearrangement of atoms to form new substances.

The indications that a chemical reaction has occurred is:

Therefore, When sodium hydroxide is dissolved in water within a beaker, it is observed that the beaker becomes warm due to chemical reaction.

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Answer:

h+(aq)+no−2(aq)⇌hno2(aq)2. hno2(aq)⇌h+(aq)+no−2(aq)3. hno2(aq)⇌h−(aq)+no+2(aq)4. hno2(aq)+h+(aq)⇌h2no+2(aq)5. hno2(aq)+h−(aq)⇌h2no+2(aq)​b.

Explanation:

The acidic equilibrium equation for nitrous acid is shown as HNO₂ ⇄ H⁺ + NO₂⁻ in which acid is in equilibrium with its dissociate ions.

Equilibrium state in any chemical reaction is that state in which concentration of reactant and products will attain constant value.

Acidic equilibrium equation for Nitrous acid (HNO₂) is shown as:

HNO₂ ⇄ H⁺ + NO₂⁻

From the above equation it is clear that in equilibrium state concentration of nitrous acid is in equilibrium with the H⁺ ion and NO₂⁻ ion.

Hence, HNO₂ ⇄ H⁺ + NO₂⁻ is the acidic equilibrium equation.

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The molarity of the lead(II) nitrate solution if 22.00 mL of 2.00 M potassium iodide is needed to reach the equivalence point with 18.00 mL of lead (II) nitrate is 1.2M.

The molarity of a solution can be calculated using the following formula:

CaVa/CbVb = na/nb

Where;

The balanced equation of the reaction is as follows:

Pb(NO3)2 (aq) + 2KI (aq) → 2KNO3 (aq) + PbI2 (s)

22 × 2/18 × Cb = 2/1

44/18Cb = 2

Cb = 44 ÷ 36

Cb = 1.2M

Therefore, the molarity of the lead(II) nitrate solution if 22.00 mL of 2.00 M potassium iodide is needed to reach the equivalence point with 18.00 mL of lead (II) nitrate is 1.2M.

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The two isotopes' relative abundances are: 121 antimony = 57.2% and

123 antimony = 42.8%.

The average mass of all antimony isotopes is 121.76 amu.

Taking into account your data,

(the sum of both abundances is 100%), and

120.904x+122.904y=121.76

Now, some high school algebra will assist us in understanding the solution.

= 120.904x+12.2904x=121.76x=0.572, and thus

x+ y= 1

∴y≈ 0.42

Results show that 121 Sb has a relative abundance of about 57.2% and 123 Sb has a relative abundance of about 42.8% when these decimals are converted into percentages.

There are 2 naturally occurring isotopes of antimony. Antimony-121 has a mass of 120.904 amu, and antimony-123 has a mass of 122.904 amu.

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Answer:

56.4 m

Explanation:

volume increases by factor of 6, i.e \(\frac{V2}{V1}\) = 6

Initial temperature T1 at bottom of lake =  5.24°C = 278.24 K

Final temperature T2 at top of lake = 18.73°C = 291.73 K

NB to change temperature from °C to K we add 273

Final pressure P2 at the top of the lake = 0.973 atm

Initial pressure P1 at bottom of lake = ?

Using the equation of an ideal gas

\(\frac{P1V1}{T1}\) = \(\frac{P2V2}{T2}\)

P1 = \(\frac{P2V2T1}{V1T2}\) = \(\frac{0.973*6*278.24}{291.73}\)

P1 = 5.57 atm

5.57 atm = 5.57 x 101325 = 564380.25 Pa

Density Ρ of lake = 1.02 g/\(cm^{3}\) = 1020 kg/\(m^{3}\)

acceleration due to gravity g = 9.81 \(m/s^{2}\)

Pressure at lake bottom = pgd

where d is the depth of the lake

564380.25 = 1020 x 9.81 x  d

d = \(\frac{564380.25}{10006.2}\) = 56.4 m

Answer:

what is the importance of anthropology as a student?

Social anthropology plays a central role in an era when global understanding and recognition of diverse ways of seeing the world are of critical social, political and economic importance. Social anthropology uses practical methods to investigate philosophical problems about the nature of human life in society.

Explanation:

Answer: a

. dissolving it in water

Explanation:

When the unknown material is dissolved in water, it could react with the water particles and end up producing another material. For instance an alkali metal in water could form metal oxides.

Heating the material until it melts will not change it into another material because it will still be the same material only now it will be in liquid form. The same logic applies if it is burnt in a flame.

Answer:

2.076

Explanation:

1 mole is 6.02 * 10^23

To convert from atoms (or molecules or compounds or ions etc.) to mols, you divide the number of atoms (or molecules or etc.) by 6.02 * 10^23

So it is (1.25 * 10^24)/(6.02 * 10^23)

=2.076

Answer:

\(\boxed {\boxed {\sf 2.08 \ mol \ C}}\)

Explanation:

We are asked to convert a number of carbon atoms to moles.

We will use Avogadro's Number for this, which is 6.022 × 10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. For this problem, the particles are atoms of carbon. There are 6.022 ×10²³ atoms of carbon in 1 mole of carbon.

We will also use dimensional analysis to solve this problem. To do this, we use ratios. Set up a ratio using the underlined information.

\(\frac {6.022 \times 10^{23} \ atoms \ C}{1 \ mol \ C}\)

We are converting 1.25 ×10²⁴ atoms of carbon to moles, so we multiply the ratio by that value.

\(1.25 \times 10^{24} \ atoms \ C* \frac {6.022 \times 10^{23} \ atoms \ C}{1 \ mol \ C}\)

Flip the ratio. It remains equivalent, but it allows us to cancel the units atoms of carbon.

\(1.25 \times 10^{24} \ atoms \ C* \frac{1 \ mol \ C} {6.022 \times 10^{23} \ atoms \ C}\)

\(1.25 \times 10^{24} * \frac{1 \ mol \ C} {6.022 \times 10^{23} }\)

\(\frac{1.25 \times 10^{24} } {6.022 \times 10^{23} } \ mol \ C\)

\(2.075722351 \ mol \ C\)

The original measurement of atoms has three significant figures, so our answer must have the same. For the number we calculated, that is the hundredths place. The 5 in the thousandths place tells us to round the 7 up to an 8.

\(2.08 \ mol \ C\)

1.25 ×10²⁴ atoms of carbon is equal to approximately 2.08 moles of carbon.

1. Eliminate Food Waste

Food waste in the US occurs mostly in stores and at home—either because it spoils on the store shelf or before we can eat it. According to an NRDC study, Americans throw away up to 40 percent of the food they buy. We can combat food waste by shopping for what you need, eating leftovers, composting scraps, and donating excess to food banks. You can find a local food bank at FeedingAmerica.org. Project Drawdown estimates that curbing food waste could avoid a whopping 70.5 gigatons of CO2—that’s a bigger impact than restoring 435 million acres of tropical forest.

2. Eat Plant-Based

Transitioning to a vegetarian diet can cut your carbon footprint in half, and going vegan, even lower. Even shifting from high to low meat consumption can shrink your footprint by a third, according to a University of Oxford study. If half of the world’s population reduced meat consumption and avoided the associated deforestation caused by agriculture, we could reduce carbon emissions by 66 gigatons.

3. Use Clean Energy

Renewable energy is fundamental to powering the world as we move away from fossil fuels. Modeled after World War II “war bonds,” Clean Energy Victory Bonds—a bill introduced to Congress by Sen. Udall (D-NM), Reps. Lofgren (D-CA), and Reps. Matsui (D-CA)—would offer Treasury bonds as low as $25 to finance the government’s clean energy programs. Ask your representatives to support this bill to make Clean Energy Victory Bonds a reality. Additionally, you can purchase renewable energy from installers such as Blue Pacific Solar and RGS Energy, as well as plug into renewable utilities with Clean Choice Energy and Arcadia Power, which don’t require you to install any new hardware in your home to get sun- and wind-power.

4. Participate in the Democratic Process

Climate change has implications on local, national, and global levels. While the average person isn’t responsible for governing a nation, we are responsible for deciding who does. Vote for a climate activist, support comprehensive climate policies, and use your citizen voice to contact legislators when you disagree. The results of upcoming elections will determine how Americans and their elected leaders grapple with catastrophic climate change.

5. Divest

The largest source of greenhouse gas emissions come from fossil fuels. Divesting means taking your money out of institutions that fund fossil fuel expansion, which could eventually dry up funding to those projects. So far, the fossil fuel divestment movement has removed $9.94 trillion dollars from fossil fuel companies because of institutional divestments and $5.2 billion thanks to 58,000 individual divestments. You can build a fossil-free portfolio with our nationwide network of socially-responsible investing financial advisors which you can find on GreenPages.org and by encouraging your faith organization or alma mater to divest.

6. Improve Insulation

One of the most cost-effective and accessible tactics to combating the climate crisis is better insulation. Older homes can lose up to 35 percent of heat through their walls. Modern insulation reduces the energy needed to heat a home, therefore reducing emissions and saving you money. If even half of existing buildings installed thicker insulation, 8.3 gigatons of emissions could be avoided—that’s more than overhauling efficiency for the entire international shipping industry.

8. Rethink Transportation

Overhauling the world’s transportation systems, both commercial and personal, would save as much CO2 as one billion acres of regenerative agriculture. Commercial trucks alone account for six percent of the world’s emissions—more than the collective emissions of airplanes around the globe. While individuals can’t revolutionize the shipping, flight, and automobile industries overnight, we can demand they change by voting with our dollars for public transit, using electric or hybrid vehicles, and reducing our total trips taken.  

9. Recycle

Acquiring virgin resources—from logging trees to mining minerals—exploits more resources than recycling existing materials. For example, recycled aluminum products use 95 percent less energy than creating new ones. About 50 percent of recycled materials come from households; if that number were to increase to 65 percent, at-home recycling could prevent 2.8 gigatons of carbon emissions. However, recycling wrong can slow the system and create more waste, so be sure to rinse out your recyclables and stay up to date on local regulations to make sure what you recycle isn’t causing contamination.

The activation energy of the reaction is the difference between the highest point on the reaction profile and the energy of the reactants.

A potential energy diagram or a reaction profile shows us the energ change between the reactants and the products.

As we look at the reaction profile, we observe that the products have a greater energy than the reactants hence the reaction is endothermic. The enthalpy chamgeis obtained by subtracting the energy of the products from the energy of the reactants.

The activation energy of the reaction is the difference between the highest point on the reaction profile and the energy of the reactants.

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