Question 5 of 5
Which two phrases describe the nature of an electromagnetic force?
O A. Acts only when objects touch each other
B. Produced by interactions between magnetic objects
O c. Not a fundamental force of nature
O D. Produced by interactions between electrically charged objects

Answer:

dinosaurs laid eggs,sabretooths were carnivores, bats lived millions of years ago ,fossils of cynobacteria exist?

Explanation:

Answer:

I think it's C.90º

Explanation:

Answer:

180o

Explanation:

It is 180 degrees because the central atom is the atom in the middle of two electrons. Think about it like a straight line, a straight line is equal to 180 degrees. One electron connected to the central atom will be 90 degrees and if there's another electron, it will be 180 degrees.

Hope this helps:)

Answer:

This is an endothermic reaction with a positive ΔHrxn.

Explanation:

From the question given above, we can see clearly that the energy of the product (Hp) is greater than the energy of the reactant (Hr). This simply means that the reaction is endothermic as the enthalpy change (ΔH) for the reaction will be positive.

Enthalpy change (ΔH) = Heat of product (Hp) – Heat of reactant (Hr)

ΔH = Hp – Hr = positive

NOTE: A reaction with positive enthalphy change (ΔH) is termed endothermic reaction.

Answer:

C

Explanation:

edg 2020

Answer:

8,903.09 square meters

Explanation:

Doing a quick search online we can see that there are exactly 4046.86 square meters in a single acre (1 acre). Therefore, we can simply use the rule of three to calculate the total amount of square meters in 2.2 acres. We do this by multiplying 2.2 acres by 4046.86 square meters and then dividing by 1 acre to solve for x.

1 acre  <=====>  4046.86 square meters

2.2 acres <====> x

(2.2 * 4046.86) / 1 = x

8903.09 / 1 = x

8,903.09 = x

Finally, we can see that there are 8,903.09 square meters in 2.2 acres.

Answer:

56.89 g of HF

Explanation:

We'll begin by writing the balance equation for the reaction. This is illustrated below:

SiF₄ + 2H₂O —> 4HF + SiO₂

Next, we shall determine the mass of H₂O that reacted and the mass of HF produced from the balanced equation.

This is illustrated:

Molar mass of H₂O = (2×1) + 16 = 2 + 16 = 18 g/mol

Mass of H₂O from the balanced equation = 2 × 18 = 36 g

Molar mass of HF = 1 + 19 = 20 g/mol

Mass of HF from the balanced equation = 4 × 20 = 80 g

Summary:

From the balanced equation above,

36 g of H₂O reacted to produce 80 g of HF.

Finally, we shall determine the mass of HF produced from the reaction. This is illustrated below:

From the balanced equation above,

36 g of H₂O reacted to produce 80 g of HF.

Therefore, 25.6 g of H₂O will react to produce = (25.6 × 80)/36 = 56.89 g of HF.

Thus, 56.89 g of HF were produced from the reaction.

Answer:

Volume of dry gas at STP = 0.432 liters or 432 ml

Explanation:

Given:

Pressure (P) = 740 mmHg - 24 mmHg = 716 mmHg

Temperature (t) = 25 degrees C + 273 K = 298 K

500 ml = 0.5 l

Find:

Volume of dry gas at STP

Computation:

[P1][V1] / T1 = [P2][V2] / T2

[716][0.5] / 298 K = [760][ x Liters] / 273 K

x = 0.432 Liters

Volume of dry gas at STP = 0.432 liters or 432 ml

Answer:

sure

Explanation:

The substance formed after heating the mixture of that of Rahul is caleed a compound. Whereas, Manav's mixture still remains in its current stae that is a heterogeneous mixture.

The compound formed is in black in color whereas the mixture is a mix of brownish-red and yellow.

The compound is a homogeneous mixture whereas the mixture is a heterogenous mixture because of its uneven distribution.

Answer:

4

Explanation:

24/6 is 4.

Answer:

Mathematically: D = m/v. If you know what liquid you have, you can look up its density in a table. Once you know that, all you have to do to find the mass of the liquid is to measure its volume. Once you know density and volume, calculate mass using this relationship: mass = density • volume.

Explanation:

Answer:

platinum = 21.4 I think it's letter D to be related to it.

Answer:

Option D. 0.115 M

Explanation:

The following data were obtained from the question:

Mass of CuSO4 = 36.8 g

Volume of solution = 2 L

Molar mass of CuSO4 = 159.62 g/mol

Molarity of CuSO4 =..?

Next, we shall determine the number of mole in 36.8 g of CuSO4.

This can be obtained as shown below:

Mass of CuSO4 = 36.8 g

Molar mass of CuSO4 = 159.62 g/mol

Mole of CuSO4 =.?

Mole = mass /Molar mass

Mole of CuSO4 = 36.8 / 159.62

Mole of CuSO4 = 0.23 mole

Finally, we shall determine the molarity of the CuSO4 solution as illustrated below:

Mole of CuSO4 = 0.23 mole

Volume of solution = 2 L

Molarity of CuSO4 =..?

Molarity = mole /Volume

Molarity of CuSO4 = 0.23 / 2

Molarity of CuSO4 = 0.115 M

Therefore, the molarity of the CuSO4 solution is 0.115 M.

Answer:

The plant uses carbon dioxide and water to make an entirely new chemical hence chemical change.

Explanation:

Plants create their own 'food', they turn carbon dioxide water and sunlight to create starch and glucose..

Answer:

The properties of carbon dioxide and oxygen are different.

Explanation:

im taking the exam right now and Im pretty sure it's D The properties of carbon dioxide and oxygen are different.

Answer:

Molarity = 1.4 M

Explanation:

Given data:

Mass of LiCl = 15.25 g

Volume of solution = 250 mL (250/1000 = 0.25 L)

Molarity of solution = ?

Solution:

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles of solute / L of solution

Now we will calculate the number of moles of LiCl.

Number of moles = mass/molar mass

Number of moles = 15.25 g/ 42.39 g/mol

Number of moles = 0.36 mol

Molarity:

Molarity = 0.36 mol / 0.25 L

Molarity = 1.4 M           (M= mol/L)

Explanation:

When you heat an atom, some of its electrons are "excited* to higher energy levels. When an electron drops from one level to a lower energy level, it emits a quantum of energy. ... The different mix of energy differences for each atom produces different colours. Each metal gives a characteristic flame emission spectrum.

Answer:

The effect is the increasing of the molar concentration.

Explanation:

When you standarize a solution of NaOH with KHP you are establish its molar concentration (That is the amount of moles of NaOH per liter of solution).

If you evaporated some water of the solution, you are increasing its concentration because volume is decreasing doing the amount of moles per liter increasing.

Answer:

Explanation:

We shall use the formula S₁V₁ = S₂V₂

S₁ = .1180 M , V₁ = 25.98 mL

S₂ = ? , V₂ = 52.50 mL

.1180 M  x 25.98 = 52.50 x S₂

S₂ = .0584 M

Molarity of the acid solution = .0584 M .

The concentration of the acid solution is 0.058 M.

The equation of the reaction is;

CH3COOH(aq) + KOH(aq) ----->  CH3COOK(aq) + H2O(l)

The following are known;

Concentration of base CB = 0.1180 M

Volume of base VB =  25.98 mL

Concentration of acid CA = ?

Volume of acid VA = 52.50 mL

Number of moles of acid NA = 1

Number of moles of base NB = 1

Using;

CAVA/CBVB =NA/NB

CAVANB = CBVBNA

CA=  CBVBNA/VANB

CA = 0.1180 M × 25.98 mL × 1/52.50 mL × 1

CA = 0.058 M

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Answer:

c

Explanation:

Answer:

c = π / R × T

Explanation:

The osmotic pressure exerted by a solution is equal to the molarity multiplied by the absolute temperature and the gas constant  R .  Suppose the osmotic pressure of a certain solution is measured to be  22 atm  at an absolute temperature of  353 K.  Write an equation that will let you calculate the molarity  c  of this solution. Your equation should contain only symbols. Be sure you define each symbol other than  R.

Step 1: Given data and definition of the symbols

Step 2: Write an equation that will let you calculate the molarity of this solution, in terms of symbols

The osmotic pressure is a colligative property that can be calculated using the following expression.

π = c × R × T

We can rearrange this expression to calculate the molarity of the solution.

c = π / R × T

Answer:

7

Explanation:

Answer:

7 is your answer

YW! :)

Explanation:

Answer:

A gamma ray is a penetrating form of electromagnetic radiation arising from the radioactive decay of atomic nuclei. It consists of the shortest wavelength electromagnetic waves and gives off the highest photon energy. The energy spectrum of gamma rays can be used to identify the decaying radionuclides using gamma spectroscopy.

Explanation:

Answer:

Compaction.

Explanation:

All the others are before this.

A buffer system has been the salt solution that has been able to avoid the change in the pH with the addition of acid or base to the solution.  

The acid has been comprised of the hydrogen ion, and react with the base with the formation of salt, thereby limit the change in pH.

The addition of acid to the buffer solution has been given as:

[tex]\rm HCl+NH_3\;\leftrightharpoons\;NH_4Cl[/tex]

The base addition to the buffer reacts with the acid part of the buffer and forms salts to resist the change in pH.

The addition of the base, KOH to the buffer solution has been given as:

[tex]\rm KOH+NH_4^+\;\leftrightharpoons\;K^+\;+\;NH_3\;+\;H_2O[/tex]

Learn more about buffers, here:

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Answer:

C a chemical has become a different color

Explanation:

is it a chemical change when water turns to ice? or to water vapor? no because it can easily change back.

it's not A obviously

I just explained why it's not B

and again it's obviously not D

It's C because once you change the color of something you can most likely not change it back (cake batter, stained glass) making it a chemical change

Answer:

0.0611M of HNO3

Explanation:

The concentration of the NaOH solution must be 0.1198M

The reaction of NaOH with HNO3 is:

NaOH + HNO3 → NaNO3 + H2O

1 mole of NaOH reacts per mole of HNO3.

That means the moles of NaOH used in the titration are equal to moles of HNO3.

Moles HNO3:

12.75mL = 0.01275L * (0.1198mol / L) = 0.0015274 moles NaOH = Moles HNO3.

In 25.00mL = 0.025L -The volume of the aliquot-:

0.00153 moles HNO3 / 0.025L =

Answer:

The Answer is eight.

Explanation:

Sorry if it's too late and it doesn't help! But I hope you have a magnificent day! :3

Answer:

8

Explanation:

I had this question on my quiz and got it right.

Answer:

Explanation:

Area of person's back = .18 m²

energy of radiation falling on the back per second

= 70 x .18 J

= 12.6J

Energy absorbed per second = .5 x 12.6 = 6.3 J

energy absorbed per hour = 6.3 x 60 x 60 = 22680 J

energy required to break one mole bond = 348 x 10³ J  

energy required to break one bond = 348 x 10³ / 6.02 x 10²³

= 57.8 x 10⁻²⁰ J .

So number of bonds broken in one hour = 22680 / 57.8 x 10⁻²⁰

= .392  x 10²³ bonds .

= 39.2 x 10²⁰ bonds .

Answer:

Specififc rotation [∝] = 0.5° mL/g.dm

Explanation:

Given that:

mass = 400 mg

volume = 10 mL

For a solution,

The Concentration = mass/volume

Concentration = 400/10

Concentration = 40 g/mL

The path length l = 20 cm = 2 dm

Observed rotation [∝] = + 40°

Specififc rotation [∝] = ∝/l × c

where;

l = path length

c = concentration

Specififc rotation [∝] = (40 / 2 × 40)

Specififc rotation [∝] = 0.5° mL/g.dm

Using the specific rotation formular, the specific rotation obtained for the compound ls 5°

Given the Parameters :

Concentration, C

Concentration = mass × volume

Mass = 400 mg = 400 /1000 = 0.4g

Volume = 10 mL

Concentration = 0.4g × 10 mL = 4g/mL

The specific rotation formular, [tex] [\alpha] [/tex] is given by :

[tex] [\alpha] = \frac{\alpha_{observed}}{C \times l} [/tex]

[tex] [\alpha] = \frac{40°}{4 \times 2} = \frac{40°}{8} = 5° [/tex]

Therefore, the specific rotation of the compound ls 5°

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Answer:

D. electron

Explanation:

Electrons have a negative charge

Answer:

C.

Explanation:

You can use the series of elimination for this. First, you look at A. Technology is not an understanding of something new, so we cross that out. Second, you look at B. Technology isn't a series of steps, so we can mark that one off. Third, you look at C. Technology is something created using science for use by society, so we can keep that in mind. Lastly, we check D. Technology doesn't match up to the definition, so we can cross that one out. The answer that would make the most sense would be D.

Answer:

The velocity of the river increased.

There was more erosion in the stream.

The type of sediment that moved changed.

Explanation:

Answer:

The river increased its slope.

The volume of the river decreased.

The velocity of the river increased.

There was more erosion in the stream.

The type of sediment that moved change

Explanation: