Help me please, I am confused ​

Answer:

Change in energy.

Explanation:

An energy change is required to shift one state to another or do any of the other listed.

Answer:

The reaction is not balanced.

Explanation:

The reaction expression is given as:

     4NH₃   +   5O₂   →   4NO  +   5H₂O

In a balanced reaction equation, the number of atoms on both sides of the expression is the same.

Now let us investigate;

Elements                            N                          H                       O

Reactants                           4                          12                       10

Products                            4                           10                        9

We see that the number of H and O on both sides of the expression is not the same. The reaction is not balanced.

Answer:

True

Explanation:

Gases don't have any shape or form, so they could not be definite.

Answer:

False

Explanation:

Let's break down the equation PV=nRT.

P=Pressure

V= Volume

n= number of mole

R= the universal constant

T= Temperature

The = sign is the barrier between them. Whenever one side of the equation increases, something on the other side is directly impacted. When Temperature increases, so will pressure--and vise versa.

Answer:

High salinity, low temperature.

Explanation:

A lot of salt is left behind. This leads to water with  very high salinity

The salinity of the water increases as more salt is dissolved in it. High temperature, density and salinity produce the most dense water.

Salinity influences the physical properties of water, such as density and heat capacity, together with temperature and pressure.

When two water samples of the same volume are compared, the water sample with the higher salinity will have more mass and be more dense.

The ocean's salinity is raised by both sea ice production and ocean water evaporation. However, processes that reduce salinity, such as the ongoing inflow of fresh water from rivers, precipitation of rain and snow, and melting of ice, constantly balance out these "salinity rising" causes.

Thus, salinity ,density and high temperature produce the water dense.

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Answer:

1. An aquifer is an underground layer of water-bearing permeable rock, rock fractures or unconsolidated materials. Groundwater can be extracted using a water well. The study of water flow in aquifers and the characterization of aquifers is called hydrogeology.

2. watershed

Simply put, a watershed is “all the land area where the rain runs downhill to a certain point,” explains Carolyn Staudt, who leads NSF-funded science projects at the Concord Consortium on land use and its effects on water resources.

3. Healthy watersheds provide critical services, such as clean drinking water, productive fisheries, and outdoor recreation, that support our economies, environment and quality of life

What is an aquifer : natural underground storage area

What is the name for the land area where all rain runs downhill to a certain point : collection? normally would be called watershed.

Why are watersheds important for the maintenance of water quality : 1, 2

Answer:

Explanation:

first, you calculate the amount of O2 in moles:

98.0 ÷ 32 = 3.0625

second, the ratio if O2/C3H8 is 5 so you need to calculate O2 in moles with that:

3.0625 ÷ 5 = 0.6125

third, the amount of CO2 in moles also can be calculate by the ratio of C3H8/CO2 which is 3

0.6125 × 3 = 1.8375

then multiply CO2 in moles by its molar mass which is 44 g/mol

1.8375 × 44 = 80.85g

Answer:

dry

polar

highlands

temperate marine

temperate continental

Explanation:

Answer: chemical change as a new product is formed

hope this is correct / it helps  

Answer:The same chemical element can have a different number of neutrons and still be the same element. We refer to the atoms of the same element with different numbers of neutrons as "isotopes"

Explanation:

Answer:

The correct answer is B. and C. according to me!

Answer:

A. and C.

no explanation...

Answer:

17 g

Explanation:

Answer:

The change in temperature for the water is 4.21 C and its final temperature is 29.21 C

Explanation:

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

There is a direct proportional relationship between heat and temperature. The constant of proportionality depends on the substance that constitutes the body as on its mass, and is the product of the specific heat by the mass of the body. So, 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:

5.78*10³ J= 4.186 [tex]\frac{J}{g*C}[/tex] *328 g* ΔT

Solving:

ΔT= [tex]\frac{5.78*10^{3} J }{4.186\frac{J}{g*C}*328 g}[/tex]

ΔT= 4.21 C

Being ΔT= Tfinal - Tinitial and Tinitial=25 C, then:

4.21 C= Tfinal - 25 C

4.21 C + 25 C= Tfinal

29.21 C= Tfinal

The change in temperature for the water is 4.21 C and its final temperature is 29.21 C

Answer:

Explanation:

Answer:

15.44 gm

Explanation:

Hope it is helpful....

Answer:

1.25 moles of tungsten carbide

Explanation:

Tungsten carbide, WC, is a substance that is produced prom carbon and tungsten as follows:

W + C → WC

Based on the reaction, 1 mole of Carbon produce 1 mole of tungsten carbide. That means if 1.25 moles of carbon are added in excess of tungsten, the moles of tungsten carbide produced are:

Answer:

There are more hours of daylight at Location X than at Location Y.

Explanation:

The student has created a model in the diagram in which sun and earth are presented. There are two point location on earth one is x and other is y. The x point is declined towards the sun which means that locations on point x receives more light than location Y. There will be more hours of daylight at Location x.

The best comparison of the conditions at Location X and Location Y is there are more hours of daylight at Location X than at Location Y.

The sun is the big spherical of heat and energy. The sun gives light. The Earth is the third planet of our solar system.

Thus, the correct option is C, There are more hours of daylight at Location X than at Location Y.

Learn more about Sun and the Earth

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Answer:

to give off positive vibes <3

Explanation:

Answer:

Molar mass and Mass

Explanation:

The relationship between mass and number of moles is given as;

Number of moles = Mass / Molar mass

Mass = 1.6 g

Molar mass of HCl = ( 1 + 35.5 ) = 36.5 g/mol

Number of moles = 1.6 g / 36.5 g/mol

Number of moles = 0.0438 mol

Explanation:

None of the original base remains in solution.

Answer:

C

Explanation:

It depends on the direction of the arrow.

If the arrow goes like this ---> the reactant would be 2Fe2O3

If the arrow goes like this <--- the reactants would be 4Fe + 3O2

Answer:

in this also 1st option is correct because na is also a metal and metal gains electron...

Answer:

The Lewis structure of CH3OCH3 is dimethyl ether, the simplest ether in existence

Explanation: