What happens to mass and energy in a closed system?
OA. Only mass can enter or exit a closed system.
B. Both energy and mass can enter or exit a closed system.
C. Neither energy nor mass can enter or exit a closed system.
OD. Only energy can enter or exit a closed system.
SUB

Answer:

B) electron cloud model

Explanation:

Because of the true nature of atom is actually look like a cloud model. The other three were before we observe a true atom

K⁺ potassium ion has total 19 proton, 18 electron and 19 neutron. It belongs to group 2 of periodic table and period 4. K has total 1 valence electron.

A material is considered an element if it cannot be divided into two or even more simpler compounds by any kind of chemical process, including the use of light or heat.

For instance, when a piece of gold is melted, the gold element still melts and is there. These substances are monoatomic, meaning they are made up of just one kind of atom. K⁺ potassium ion has total 19 proton, 18 electron and 19 neutron. It belongs to group 2 of periodic table and period 4. K has total 1 valence electron. Cl⁻ chlorine ion has total 17 proton, 18 electron and 17 neutron. It belongs to group 17 of periodic table and period 3. It has total 1 valence electron.

Therefore, K⁺ potassium ion has total 19 proton, 18 electron and 19 neutron. It belongs to group 2 of periodic table and period 4. K has total 1 valence electron.

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Answer:

Explanation:

D. Bonds between atoms are broken and new bonds are formed.

Answer: D. Synthesis

Explanation:

Sodium Oxide + Water = Sodium Hydroxide

Answer:

62,790J

Explanation:

Q=mcT

= 250g*4.186J/gc*80-20

=250*4.186*60=62,790J

Answer: they would have to be some where else

Explanation: hope this helps a little

Answer:

False

there is three

Explanation:

Three laws are combined together which is further known to us as Newton ’s three laws of motion. These three newton’s laws of motion are: Law I – Newton’s first law of motion Law II – Newton’s second law of motion

Hope this helps :)

We can calculate the heat of the reaction using the equation above:

q = -C_cal * ΔT

q = -10.0 j/oc * 6.7 oc

q = -67.0 j

The heat of a reaction can be calculated using the equation:

q = -C_cal * ΔT

where q is the heat absorbed or released by the reaction, C_cal is the heat capacity of the calorimeter, and ΔT is the temperature change.

First, we need to calculate the mass of the reaction mixture, which can be found using the density and volume:

mass = density * volume

mass = 1.00 g/ml * 67.1 ml

mass = 67.1 g

Next, we need to calculate the total heat capacity of the reaction mixture and calorimeter:

C_total = mass * specific heat + C_cal

C_total = 67.1 g * 4.184 j/g-oc + 10.0 j/oc

C_total = 287.3 j/oc

Finally, we can calculate the heat of the reaction using the equation above:

q = -C_cal * ΔT

q = -10.0 j/oc * 6.7 oc

q = -67.0 j

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Answer:

47.596008

Explanation:

The velocity of the car is 20 m/s. So, the correct option is  C. 20 m/s north.

To determine the velocity of the car, we need to calculate the displacement and divide it by the time taken.

The car initially moves 50 m south of the library and then ends up 250 m north of the library, resulting in a displacement of 250 m - (-50 m) = 300 m. The time taken is given as 15 seconds.

Therefore, the velocity can be calculated as displacement divided by time: 300 m / 15 s = 20 m/s.

Since the displacement is positive (from south to north), the velocity is also positive, indicating the car is moving north. Therefore, the correct answer is option C: 20 m/s north.

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On the other end of the swing, the kinetic energy begins to change back into potential energy. The pendulum then comes to a complete stop! At the end of each swing, it comes to a complete stop for a brief moment. When the energy is "at rest," it is once again potential energy.

The given equation is not a balanced chemical equation as the mass of atoms on the both reactant and product side is not equal. Therefore, this equation does not demonstrate the law of conservation of matter.

A chemical equation can be defined as the representation of a reaction with help of symbols of the substances. A chemical equation includes of reactants participating and formed products separated by an arrow in the equation.

The chemical equation in which the mass of reactants is equal to the mass of the products is called a balanced chemical equation. For that, the law of conservation of mass should be followed by a balancing of a chemical equation which says that the mass can neither be created nor destroyed.

The given chemical equation of silver oxide is:

\(Ag_2O\longrightarrow Ag+O_2\)

The number of atoms of silver and oxygen is not equal on both sides.

The balanced chemical equation will be for the above reaction:

\(2Ag_2O\longrightarrow 4Ag +O_2\)

and this equation demonstrates the law of conservation of matter.

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Answer:

2Ga(OH)3 + 3Hg2Cl2 → 6Hg(OH) + 2GaCl3

Explanation:

Answer: 2Ga(OH)3 + 3Hg2Cl2 → 6Hg(OH) + 2GaCl3

reaction type: Double Displacement

Answer:

last one

Explanation:

sorry if this isnt right but the last one just makes the most sence:)

Explanation:

(1) 1 m = 100 cm

1.45 m = 100 × 1.45 cm = 145 cm

(2) 1 kg = 1000 g

325 g = 0.325 kg

(3) 1 L = 1000 mL

0.0024 L= 2.4 mL

(4) 1 km = 1000 m

\(1.55\times 10^4\ m=1.55\times 10^4\times 0.001=15.5\ km\)

(5) 1 mm = 0.001 m

\(4.75\times 10^{-2}\ m=4.75\times 10^{-2}\times 1000\ mm\\\\=47.5\ mm\)

(6) 1 kg = 100000 cg

0.459 kg = 45900 cg

(7) 1 dm = 10⁻⁴ dm

5,995 dm = 5,995 × 10⁻⁴ km

(8) 1 g = 1000 mg

450 g = 450000 mg

(9) 1 dm = 100 m

0.003 dm = 0.3 mm

(10) 1 mL = 0.001 l

4.567 × 10⁴ mL = 45.67 L

Answer:

why would you do that...

Answer:

Solar energy. Biofuel, Nuclear power, Hydro power, Geothermal energy, Fossil, Gasoline, sun

In scientific investigations, the effect of fertilizer on plant growth can be studied by examining various variables. Two key variables in this context are the presence or absence of fertilizer (independent variable) and the size or growth of the plant (dependent variable).

When investigating the effect of fertilizer on plant growth, the independent variable is the presence or absence of fertilizer. This variable is controlled by having two groups of plants: one group receiving fertilizer (experimental group) and another group without fertilizer (control group). By comparing the growth of these two groups, we can determine the impact of fertilizer on plant size.

The dependent variable, on the other hand, is the size or growth of the plant. This variable is measured or observed as the outcome of interest. In this case, it would be the height, weight, or overall size of the plants.

By systematically changing the independent variable (presence or absence of fertilizer), we can observe how it affects the dependent variable (plant growth). The experimental group receiving fertilizer is expected to show greater plant growth compared to the control group without fertilizer. This allows us to draw conclusions about the effect of fertilizer on plant growth.

However, it is important to note that the specific outcome may vary depending on other factors such as plant species, soil conditions, and environmental factors. Conducting a controlled experiment while considering these factors helps in obtaining more reliable results.

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Answer:

liquids

Explanation:

are not solids

big brain answer

Answer:

According to the activity series of metals, a metal can replace another metal in a compound if it is more reactive than that metal. The more reactive metal will form a compound, while the less reactive metal will be displaced as a free element. So, the reaction that will not take place is the one in which the metal is less reactive than the one in the compound.

Looking at the given reactions, the reaction that will not take place is 2NaCl + Ca → CaCl2 + 2Na. This is because calcium (Ca) is more reactive than sodium (Na) on the activity series of metals, which means that it can replace sodium in a compound. Therefore, calcium will react with sodium chloride (NaCl) to form calcium chloride (CaCl2) and sodium (Na) as a free element. However, the given reaction shows sodium (Na) displacing calcium (Ca), which is not possible according to the activity series of metals.

Answer: Reactions 1 and 3 will not take place

Zn + MgCl2 → Mg + ZnCl2 - Reaction 1

Li + AgNO3 → Ag + LiNO3 - Reaction 2

2NaCl + Ca → CaCl2 + 2Na - Reaction 3

Pb(NO3)2 + Ni → Ni(NO3)2 + Pb - Reaction 4

Explanation: In the Reactivity Series, Magnesim(Mg) has a higher reactivity tha Zinc so it should be that there is no reaction whereas in reaction 3, Sodium has a higher reactivity than Calcium so no reaction happens

Answer:

mining of clay limestone and then heated to a certain temperature of 1450⁰ in a cement kiln

The final temperature of the gas, after absorbing 1300 J of heat and doing 2200 J of work, is approximately 375.45 K.

To find the final temperature (T_final) of the gas, we can use the first law of thermodynamics, which states that the change in internal energy (ΔU) of a system is equal to the heat added (Q) minus the work done (W) by the system:

ΔU = Q - W

Since the gas is ideal and monatomic, the change in internal energy is related to the temperature change (ΔT) through the equation:

ΔU = nC_vΔT

where n is the number of moles and C_v is the molar heat capacity at constant volume.

Rearranging the equations and substituting the given values:

nC_vΔT = Q - W

(5.00 mol)(3/2R)ΔT = 1300 J - 2200 J

(5.00 mol)(3/2)(8.3145 J/(mol⋅K))ΔT = -900 J

Simplifying:

(37.9725 J/K)ΔT = -900 J

ΔT = -900 J / (37.9725 J/K)

ΔT ≈ -23.70 K

Since the initial temperature is 126 °C, we convert it to Kelvin:

T_initial = 126 °C + 273.15 = 399.15 K

Now we can find the final temperature:

T_final = T_initial + ΔT

T_final = 399.15 K - 23.70 K

T_final ≈ 375.45 K

Therefore, the final temperature of the gas is approximately 375.45 K.

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The first one appear to be a pan with some liquid heating up.

The beginning state is liquid, the phase change type is a vaporization and its ending state is gas.

The second one seems to be a ice cube melting.

Its beginning phase is solid, the phase change type is fusion, and its ending state is liquid.

The third one is water, or other liquid, making clouds.

The beginning state is liquid, the phase change type is a vaporization and its ending state is gas.

The fourth illustration seems to be an aluminium can. There aren't really a phase change happening, but when we open the aluminium can containing gaseous drink, there are molecules of gas diluted into the liquid and some of it encouter each other to make a bubble of the gas and is released. It is not an actually phase change, it is the reverse process of diluting gas into liquid. Initially it is diluted gas, it gets released and in the end it is in gas phase.

The correct option is C. Erosion is the process by which the earth surface get worn down. It involves the removal of soil, rocks or dissolved material from one location and its transportation to another location.

Given that ionization constant of water (Kw) at 40°C is 2.9x10^-14 .

We need to calculate H3O+, OH-, pH and pOH for pure water at 40°C.

The ionization of water can be given as:

2H2O ⇌ H3O+ + OH-Kw = [H3O+][OH-]

Putting the values:Kw = [H3O+][OH-]2.9x10^-14 = [H3O+][OH-]

Let [H3O+] = [OH-]= x

∴ Kw = x2∴ x = √2.9x10^-14x = 1.7x10^-7mol/L

Hence, [H3O+] = [OH-] = 1.7x10^-7mol/LpH = -log[H3O+]pH = -log(1.7x10^-7)pH = 6.7689pOH = -log[OH-]pOH = -log(1.7x10^-7)pOH = 6.7689

Therefore, pH and pOH of pure water at 40°C are 6.7689.

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Answer:

0.578 mol H₂SO₄

Explanation:\(\frac{3.48 * 10^{23}H2SO4}{1}\) ×\(\frac{1 mol H2SO4}{6.02214*10^{23}molecules H2SO4}\) =0.5778 mol H₂SO₄ = 0.578mol H₂SO₄