Please answer both 7 and 8

Answer:

Explanation:

Answer:

True

Explanation:

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

Answer:

Melting

Explanation:

Once heat is added it will turn to a liquid

Melting is the process of turning solid to liquid.

Answer:

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

Answer:

A. and C.

no explanation...

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:

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.

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Boyle's law states that If the pressure on a gas is increased, then its volume will decrease because the gas molecules will gets closely packed at high pressure.

According to Boyle's law, at constant temperature the volume of a gas is inversely  proportional to the pressure. Therefore, as the pressure is increased, volume of the gas is decreased.

The volume of a gas is the total space it occupied . The gaseous particles can diffuse anywhere at low pressure and they not collide each other at this maximum spreading condition.

When the pressure is increased, the force of intermolecular attraction  increases make them more compressed and the space occupied by them that is the volume of the gas reduces.

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Answer:

What is the effect of ✔ pressure on the volume of a gas?

Explanation:

edge 2023

Answer:

MnO₂

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:

Change in energy.

Explanation:

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

Answer:

to give off positive vibes <3

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:

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

Answer:

Bonding in chemistry is known as chemical bonding which means the interaction or attraction between molecules.

Chemical bonds are of different type such as ionic, covalent, hydrogen, and metallic. Ionic bonds are formed by the transfer of valence electron from one atom to other and there is unequal distribution of electrons between two or more atoms. Ionic bonds forms two oppositely charges ions positively charged (loses electron) or negatively charged (gains electron).

Covalent bond are the strong chemical bonds that form due to equal sharing of electron pairs between atoms. They form a stable element and have stable attraction or repulsive forces.

Answer:

dry

polar

highlands

temperate marine

temperate continental

Explanation:

Answer: chemical change as a new product is formed

Answer:

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

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:

answer is 0.5

Explanation:

H= 2X l =2

0=16 xl = 16

So 16+2=18

lmol of H2O → 18g

xmol of H2O →9g

:. 9÷ 18=0.5

x= 0.5

Answer:

15.44 gm

Explanation:

Hope it is helpful....

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:

Table salt, or sodium chloride (NaCl), the most common ionic compound, is soluble in water (360 g/L)

hope this is correct / it helps  

Answer:

Molecules contained in a liquid evaporate from the surface area. This means that the larger the surface area, the faster the rate of evaporation. ... This means all the other factors that affect the rate of evaporation are identical. Leave the containers for one hour.

Explanation:

Answer:

Evaporation would accelerate.

Explanation:

Direct sunlight increases the thermal energy on the containers, increasing evaporation.

Answer:

17 g

Explanation: