Calcium has two electrons in its outer level. What will it most likely do in a reaction?

try to give away its two outer electron to another atom
try to pick up 6 electrons from another atom or two
try to pick up 2 electron from another atom to fill the 4s sublevel
nothing because it is perfectly stable.

Answer:

the valency of oxygen is -2

Answer:

-2

Explanation:

The valency of oxygen is -2. This means oxygen needs to gain or share two electrons for stability.

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Answer:

Explanation:

7 times 200 is 1400 grams but thats not the question it asks in kilo's so i got a converter and the correct answer is 1.4 kilograms

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Answer:

Explanation:

1 kg is 1000 grams

1 peach is 200 grams

7 peaches are 200*7 = 1400 grams

Therefore the number of kg = 1400 grams // 1000 grams /kg

The number of kg = 1.4 kg.

Answer:

5.01 g

Explanation:

At STP means at standard temperature and pressure, this is when the pressure is at 1 atm and temperature is at 273 K.  At this point, the volume is 22.4 L for 1 mole of any ideal gas at a temperature equal to 273.15 K and a pressure equal to 1.00 atm

The molar mass of krypton as gotten from the periodic table is 83.8 g/mol. At STP, an ideal gas occupies 22.4 L/mol. Therefore, the grams that 1.3 L of krypton gas would occupy is:

[tex]mass=\frac{1mol}{22.4L} *\frac{83.8g}{1mol} *1.34L=5.01g[/tex]

Answer:

solute

Explanation:

solvent is the water solution is the whole mixture product is the solution

A.  a solute

B.  a solvent

C.  a solution

D.  a reactant

E.  a product

Answer:

Dense and solid. And located near a star.

Explanation:

The set of characteristics that you would use to classify this planet as an inner or terrestrial planet is Dense and solid.

Terrestrial planets are Earth-like planets made of rocks or metals with a hard floor. Terrestrial planets even have a molten heavy-steel middle, few moons, and topological capabilities which include valleys, volcanoes, and craters.

All are solid, dense, and rocky. not one of the internal planets has rings. compared to the outer planets, the internal planets are small. they have shorter orbits across the sun and they spin more slowly.

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Answer:

a. 45×10³ kg

b. 1.25 kg

c. 5443200 s

d. 2.69×10⁻⁴ m/s²

e. 2.57×10⁻⁶N

f. 7.48×10⁻³ m /s²

g. 2.45 Pa

h. 10 m/s

Explanation:

The SI units are: kg, m, s, N, K, A, Pa, J and cd

a. 1 g is the mass for 1 cm³. We convert the m³ to cm³

45 m³. 1×10⁶ cm³ / 1 m³ = 45×10⁶ cm³

By the way, 45×10⁶ cm³ = 45×10⁶ g

We convert the g to kg →  45×10⁶ g . 1 kg / 1000 g = 45×10³ kg

b. As 1 g = 1 cm³,  we convert the cm³ to g and then, the g to kg

1250 cm³ = 1250 g → 1250 g . 1kg / 1000 g = 1.25 kg

c. 1 day has 24 hours; 1 hour has 60 minutes; 1 minute has 60 seconds

1 hour has 3600 s. Then 24 h . 3600 s / 1 h = 86400 s

86400 s/d. 63 d = 5443200 s

d. 1 min² = 3600 s²

97 cm / 3600 s² = 0.0269 cm/s²  / 100 = 2.69×10⁻⁴ m/s²

e. 927 g.cm / min² / 3600 s² = 0.2575 g.cm/s² → dyn

We need to convert dyn to N

1 dyn = 10⁻⁵N → 0.2575  dyn . 10⁻⁵N / 1dyn = 2.57×10⁻⁶N

f. 1 m/s² = 12960 km/h²

12960 km/h² . 1 m/s² / 97 km/h² = 7.48×10⁻³ m /s²

g. 2500 g/cm² . 1kg / 1000 g = 2.5 kg/cm²

1 Pa = 1.02kg/cm²

2.5 kg/cm² . 1 Pa / 1.02 kg/cm² = 2.45 Pa          

h. 1 h = 3600 s

36 km / 3600 s = 0.01 km /s → 0.01 km . 1000 m / 1 km = 10

= 10 m/s

Answer: todos terminan en tu boca

Explanation:

Hahaha

Answer:

a

Explanation:

Answer:

Explanation:

In this reaction, the iron(III) oxide is reduced. to iron, and the carbon is oxidised. to carbon dioxide. In the blast furnace, it is so hot that carbon monoxide can be ...

The statement about the extraction of metals that is correct is Aluminium is extracted from bauxite by electrolysis.

Extraction of metals refers to various methods use to extract metals from the ground and refining it to a form that will easily be use by man.

Therefore, The statement about the extraction of metals that is correct is Aluminium is extracted from bauxite by electrolysis.

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Answer:

Temperature, pressure, shape of container

Answer:

temperature, density, pressure.

Explanation:

Answer:

The new temperature is 213.33 K

Explanation:

Charles's law indicates that the volume of gas at constant pressure is directly proportional to its temperature. This law indicates that if the temperature increases the volume increases and if the temperature decreases the volume decreases.

So, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the ratio between volume and temperature will always have the same value:

[tex]\frac{V}{T}=k[/tex]

When you want to study two different states, an initial and a final one of a gas, the expression can be applied:

[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]

In this case, you know:

Replacing:

[tex]\frac{15 L}{640 K} =\frac{5 L}{T2}[/tex]

Solving:

[tex]T2=\frac{5 L}{\frac{15 L}{640 K} }=\frac{5 L*640 K}{15 L}[/tex]

T2= 213.33 K

The new temperature is 213.33 K

Explanation:

All of that visible trail of radiation, especially in the form of gamma rays—the extremely energetic cousins of ordinary light. Astronomers have known for three decades that brilliant flashes of these rays, called gamma-ray bursts, arrive daily from random directions in the sky. Recently astronomers have pinned down the location of the bursts and tentatively identified them as massive supernova explosions and neutron stars colliding both with themselves and black holes. But even now nobody knows much about what goes on when so much energy is flying around. Matter grows so hot that it interacts with radiation in unfamiliar ways, and photons of radiation can crash into each other and create new matter. The distinction between matter and energy grows blurry. Throw in the added factor of magnetism, and physicists can make only rough guesses about what happens in these hellish settings. Perhaps current theories simply aren’t adequate to explain them.

Answer:

A

-1440J

Explanation:

Hello,

This question requires us to calculate the work done on a object to move it from point A to point B

Data

Mass = 60kg

Initial velocity (V1) = 8.0m/s

Final velocity (V2) = 4.0m/s

Workdone on an object is equal to force applied on the object to move it through a particular distance.

Work done = force × distance

Force (F) = mass × acceleration

Distance = s

F = Ma

Work done = M× a × s

But a = velocity (v) / time (t)

Work done = mvs / t

But velocity = distance/ time

Work done = mv × v/

Work done = mv²

Work done = ½mv²

Workdone = ½M(V2² - V1²)

Workdone = ½ × 60 (4² - 8²)

Work done = 30 × (16 - 64)

Workdone = 30 × (-48)

Work done = -1440J

Work done = -1.44kJ

The workdone on the object is equal to -1.44kJ

Answer:

–1,440 J

Explanation:

a on edge 2021

Answer:

Correct answer is table A i might be wrong

Answer:

It's A - table A

Explanation:

On Edge 2021

Answer:

B. Solvent

Explanation:

In osmosis, water always moves from low solute concentration to high solute concentration. SOLUTE NEVER MOVES AS IT CANNOT PASS THE SELECTIVELY PERMEABLE MEMBRANE. alot of caps but need to stress this concept cuz otherwise this concept gets very confusing

Answer:

Explanation:

Example for Endothermic include melting ice cubes, cooking eggs, or baking breads.

Example for Exothermic include Burning candles, lighting match, or hot packs

Answer:

520mL

Explanation:

Data obtained from the question include:

Molarity of stock solution (M1) = 12M

Volume of stock solution (V1) = 130mL

Molarity of diluted solution (M2) = 3M

Volume of diluted (V2) =..?

The volume of the diluted solution can be obtained as follow:

M1V1 = M2V2

12 x 130 = 3 x V2

Divide both side by 3

V2 = 12 x 130 / 3

V2 = 520mL.

Therefore, 520mL of the diluted solution can be prepared.

Answer:

O.2006 M

Explanation:

M1V1 =M2V2

M1 = M2V2/V1 =0.150M*32.1 ml/24.0 ml = 0.2006 M

Answer:

Heat energy required (Q) = 10.736 KJ

Explanation:

Given:

Specific heat of ethanol (C) = 2.44 J/g °C

Mass of ethanol (M) = 50 gram

Initial temperature (T1) = -20°C

Final temperature (T1) = 68°C

Find:

Heat energy required (Q) = ?

Computation:

Change in temperature (ΔT) = 68°C - (-20°C)

Change in temperature (ΔT) = 88°C

Heat energy required (Q) = mC(ΔT)

Heat energy required (Q) = (50)(2.44)(88)

Heat energy required (Q) = 10,736 J

Heat energy required (Q) = 10.736 KJ

Answer: There are [tex]0.052\times 10^{23}[/tex] oxide ions

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{0.55gg}{64g/mol}=0.0086moles[/tex]

1 mole of TiO contains = [tex]6.023\times 10^{23}[/tex] oxide ions

Thus 0.0086 moles of TiO contains = [tex]\frac{6.023\times 10^{23}}{1}\times 0.0086=0.052\times 10^{23}[/tex] oxide ions

There are [tex]0.052\times 10^{23}[/tex] oxide ions

Answer:

8J

Explanation:

From the question, the gravitational stored energy is 8J.

So Mgh=8J.

The kinetic energy is ?

When we use the law of conservation of energy, as the apple is moving and about to it the ground, it has 0m speed.

Which means that the potential energy at rest i.e when the apple is on the ground is zero. When the apple is getting to the ground, KE +PE is conserves.

At the top of the tree, the Apple has zero potential energy because velocity is zero at rest and on hitting the ground, the apple has kinetic energy.

So, the maximum Kinetic energy is 8J.

Answer:

HCl (aq) + NaOH (aq) --> H2O (L) + NaCl (aq)

Explanation:

HCl is a strong acid while NaOH is a strong alkali. Hence both should dissociate completely in water and 1 mol of HCl will fully neutralise 1 mol of NaOH.

I'm assuming that Part 2 on molarity is part of a data based question that requires you to calculate the number of moles of NaOH based on the data provided and the equation that you are required to balance. Hence, I can't help you with it as I do not have the values.

Answer:

C. 7.4 kJ

Explanation:

Let assume that Mercury is at room temperature (25 °C). The energy required to boil the sample of mercury is the sum of sensible and latent heats. Mercury has a fussion and boiling points of -38.83 °C and 356.7 °C, respectively, and a specific heat of [tex]138\,\frac{J}{kg\cdot ^{\circ}C}[/tex]. Then:

[tex]Q = (25\,g)\cdot \left[\left(0.138\,\frac{J}{g\cdot ^{\circ}C} \right)\cdot (356.7^{\circ}C - 25^{\circ}C) + 296\,\frac{J}{g} \right][/tex]

[tex]Q = 8544.365\,J[/tex]

The option that offers the best approximation to the result is C.

Answer:

2.15 L

Explanation:

M(NaOCl) = 23.0 + 16.0 + 35.5 = 74.5 g/mol

120.3 g *1 mol/74.5 g = 1.615 mol NaOCl

0.750 M = 0.750 mol/L

1.615 mol * 1L/0.750 mol = 2.15 L

Answer:

Due to the accumulation of static charges/due to static electricity

Answer:

The geographical occurrence or spatial distribution of earthly resources made them abundant at some place and lacks at other.

Explanation:

Low latitudes regions receive more energy and plenty of rainfall from the sun, while higher latitudes obtain less energy from the sun and little rainfall. Metallic minerals are easily available in regions with strong tectonic activity, and fossil fuels are found in sedimentary rocks. The plains deliver flat landscapes and rich soil which is ideal for growing crops, on the other hand, steep hills and dry areas are more difficult for the activity. Therefore climate and geography play a vital role in the uneven distribution of natural resources across the globe.

Metals are solids, non metals are gasses and metalloids are in between metals and non metals. Also, metals have there atoms all close and packed, non metals have there atoms far apart, and metalloids have there atoms either close or far apart. Metals are separated form the non metals in the periodic table.

Answer:

4. Option C. Pentane.

5. Option D.

Explanation:

4. Hydrocarbons are compound containing carbon and hydrogen only. Hydrocarbons are said to be saturated when they contain only carbon to carbon single bond. All alkanes are saturated hydrocarbon.

The correct answer is pentane.

5. Isomerism is the phenomenon whereby two or more compounds have the same molecular formula but different structural patterns. The compounds involved are called isomers.

A careful observation of the diagram above shows that only option D satisfied the definition of Isomerism as the two compound both have the same molecular formula as C3H8O but different structural patterns.

Note: option C does not contain isomers as Isomerism can not occur in a compound having just 1 carbon atom.