50 points
PLEASE HELp this dropped most of grade but I don’t understand at all

Answer:

0.05263158 atm

Explanation: mmHg to Atmosphere Conversion Example. Task: Convert 975 mmHg to atmospheres (show work) Formula: mmHg ÷ 760 = atm Calculations: 975 mmHg ÷ 760 = 1.28289474 atm Result: 975 mmHg is equal to 1.28289474 atm. This is an example for how i got the answer.

Answer:

[tex]3.40x10^{24}[/tex] molecules

Explanation:

[tex]\frac{5.65mol}{1} *\frac{6.02*10^{23}mlx }{1 mol}=3.4013x10^{24} mlx[/tex]

btw mlx stands for molecules and i put the answer in correct sig figs in case your teacher is like mine and wants answers in correct significant figures

Answer:

An important example of chemical potential energy is the energy stored in the food that you eat. Inside your body, this food is distributed around your body and is reacted in your cells to release the energy stored in the chemical bonds.

Explanation:

[tex]\bold{\huge{\blue{\underline{ Solution}}}}[/tex]

We have given in the question that,

We know that,

Amount of heat required = Mass * specific heat * change in temperature

[ Specific Latent heat of fusion is the amount of heat required to change one mole of substance from solid to liquid phase without changing in temperature .]

But, For complete melting of substance without change in temperature

Amount of heat required = Mass * Specific latent heat of fusion

Subsitute the required values,

[tex]\sf{\red{ Q = MCl}}[/tex]

Where,

Now,

[tex]\sf{ Q = 4 × 334000}[/tex]

[tex]\sf{ Q = 1336000 J }[/tex]

[tex]\sf{ Q = 1336 KJ }[/tex]

Hence, The amount of heat required to melt 4kg ice is 1336KJ

[tex]\bold{\red{ Option\: A \:is\: correct }}[/tex]

Taking into account the definition of calorimetry and latent heat, the heat energy required to melt 4 kg of ice when the specific latent heat of fusion of water is 334,000 [tex]\frac{J}{kg}[/tex] is 1,336 kJ.

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

Latent heat is defined as the energy required by a quantity of substance to change state.

When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.

The heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to

Q = m×L

where L is called the latent heat of the substance and depends on the type of phase change.

In this case, you know:

Replacing in the expression for latent heat:

Q = 4 kg× 334,000 [tex]\frac{J}{kg}[/tex]

Solving:

Q= 1,336,000 J= 1,336 kJ (being 1,000 J= 1 kJ)

Finally, the correct answer is the first option: the heat energy required to melt 4 kg of ice when the specific latent heat of fusion of water is 334,000 [tex]\frac{J}{kg}[/tex] is 1,336 kJ.

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Answer:

293°C

Explanation:

20°C+273=293°C

The menstrual cycle is regulated by hormones. Luteinizing hormone and follicle-stimulating hormone, which are produced by the pituitary gland, promote ovulation and stimulate the ovaries to produce estrogen and progesterone.

The first law of thermodynamics characterises the two types of energy transfer, as heat and as thermodynamic. The final internal (thermal) energy of the system is 1,500 J.

The energy present in a system itself for conducting reactions is called internal energy.

Given,

According to the first law of thermodynamics:

[tex]\rm Q = \Delta U + W[/tex]

Substituting values in the above equation:

[tex]\begin{aligned}\rm Q &= \rm U_{2} - U_{1} + W\\\\\rm U_{2} &= \rm Q - W + U_{1}\\\\\rm U_{2} &= 700 - 400 + 1200\\\\&= 1500 \;\rm J\end{aligned}[/tex]

Therefore, option D. 1500 J is the final energy.

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Answer: The answer would be: 1500 J

Explanation:

took the quiz

Answer:

I believe its an NH4^+ ion & an NO3^- ion

Explanation:

hope this helps!

Carbon atoms is made up of a nucleus of neutrons and six protons which is surrounded by six electrons.

This refers to a chemical element which has an atomic number of 6 and is denoted as C. It is the major constituent of all organic substances which are present in nature.

Examples include carbohydrate, hydrocarbons etc and usually acts as the central atom in reactions.

It is made up of  neutrons, six protons and six electrons thereby making it the most appropriate choice.

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Answer:

If the chemist has 35.0 g of Na, then 26.94 grams of chlorine is required to react completely with the sodium.

Number of moles of any substance can be calculated as [tex]${\rm{n = }}\frac{{\rm{W}}}{{\rm{M}}}$[/tex].

Where, W = given mass

M = molar mass

Balanced equation for the formation of NaCl can be written as:

[tex]${\rm{2N}}{{\rm{a}}_{{\rm{(s)}}}}{\rm{ + C}}{{\rm{l}}_{\rm{2}}}_{{\rm{(g)}}} \to {\rm{2NaC}}{{\rm{l}}_{{\rm{(s)}}}}$[/tex]

Here the ration of Na and Cl is 2:1.

No. of moles of Na = 35/23 = 1.52 mole

If 2 moles of Na is consumed by 1 mole of Cl, then 1 mole of Na is consumed by half mole of Cl.

Mole of Cl required to consume 1 mole of Na = 1.52/2 = 0.760 mole.

Now used mass of Cl can be find out by using the formula of moles as follow:

W = 35.45 × 0.760 = 26.94 grams

Hence, 26.94 grams of Cl is required to completely react with 35.0 grams of Na.

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Answer:

54

Explanation:

trust me its what it told me the expert verified confusing

Answer:

Is their a picture with the question?

Explanation:

Answer:

Forest fire

Explanation:

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Environmental change that is considered short term is forest fire.

Short-term environmental change is the environmental change that occurs quickly and affects organisms. Forest fires are an example of a short- term environmental change.

Short-term changes include changes in seasonal patterns, unseasonal rainfall, changes in the life cycle of insects and animals, and so on. Long term changes examples are melting of glaciers or a rise in levels of water bodies which may cover islands close to sea level.

El Niño and La Niña are two examples of short-term climate changes lasting one to a few years. In an El Niño, the trade winds reverse direction, as do the equatorial surface currents. This causes warm water to pool off of South America and stop upwelling. A La Niña is like normal conditions only more so.

Therefore, Environmental change that is considered short term is forest fire.

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Answer:

Fossils are remains or traces from ancient life's that is most likely buried in rocks anywhere in the world. Fossils are basically bones, teeth, shells, nests, leaf impressions, and footprints. That is technically explaining what our planet was like long ago. Some dinosaur fossils have been found. Paleontologists find them almost everywhere. If you don't know what Paleontologists are, they're basically people who study fossils. A lot of fossils are found in sedimentary rocks. Sedimentary is a rock that has been formed from things like sand, mud, and many other kinds of rocks.

Hope this helps.

Answer:

i guess answer is 0.0600

Explanation:

Here,

Density=0.791g/cm^3

Volume=75.89ml

So,

Mass=Density*Volume

=0.791g/cm^3×75.89ml

=60.02g/cm^3.ml

Expressing them in kg

60.02/1000

=0.0600 kg

Answer:

➢ There are eight lone pairs of electrons in each of the three resonance structures of NO3- ion. These eight lone pairs are provides by three oxygen atoms. There are no lone pairs on nitrogen atom.

[tex]Into \: your Arms[/tex]

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Answer:

natural selection

Explanation:

The process that results in changes to the genetic material of a population over time

Answer:

Here is your answer

Explanation:

Please mark me brainliest

Answer:

prepare

Assemble a disaster supply kit.

Locate safe places in your home for each type of disaster.

Determine the best evacuation routes from your home.

Become trained in first aid and CPR.

Show each family member how and where to shut off utilities (water, gas, electricity).

Explanation:

Answer:

             27.025 g of H₂O

Explanation:

The Balance chemical equation is

                                   2 H₂ + O₂ = 2 H₂O

Step 1: Calculate Limiting Reagent

Moles of H₂

                        Mole = 16 g / 2.02 g/mol = 7.937 mol

Moles of O₂

                        Mole = 24 g / 32.00 g/mol = 0.750 mol

Mole ratio of H₂ : O₂ is 2 : 1. Hence, 7.937 mol of H₂ will need 3.9685 mol of O₂. This means O₂ is limiting reagent.

Step 2: Calculate Moles of H₂O

0.750 mol of O₂ will produce 1.50 mol of H₂O because the mole ratio of O₂ : H₂O is 1 : 2.

Step 3: Calculate mass of H₂O

                          Mass = 1.50 mol × 18.02 g/mol = 27.025 g of H₂O

Answer:

5 simple characteristics of bacteria-

Single-Celled.

Absent Organelles.

Plasma Membrane.

Cell Walls.

DNA.

Explanation:

Answer:

Polystyrene and plastic foam are both used as insulators as they have small air bubbles trapped inside them. This makes them very good insulators because heat energy can't flow through them

Explanation:

Answer:

that the electromagnet can have a magnetic field when an electric current flows through it and disappears when the flow of the current stops, while permanent magnets are made up of magnetic material that can be easily magnetized and can create

Explanation:

Answer:

answer=217.047pa

Explanation:

we apply the Gay Lussac's law "at constant volume the pressure of a fixed mass of a gas is directly proportional to kelvin temperature"

p1/t1=p2/t2

hence we can modify the equation

p2=t2*p1/t1

=210*308/298

=217.047pa

In this experiment, errors may be due to the presence of impurities of the splashing of solutions used in the laboratory analysis.

Experiments are often used by scientists to determine cause and effect relationships. These experiments are often not free from errors. These errors affect the quality of the results from the experiments.

In this experiment, errors may be due to the presence of impurities of the splashing of solutions used in the laboratory analysis.

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