Question 3 of 8
Which two characteristics are needed to describe a force?
A. Direction
B. Speed
C. Resistance
D. Size
SUBT

Explanation:

hope this helps!!! happy learning!!!!

Answer:

~26 atoms of sulfur

Explanation:

When working problems involving equations I find it helpful to works through moles because it relates to the coefficients of balanced equation by linear ratio. In other words, convert data to moles, solve by ratio and convert results to desired dimensions. In this case Atoms of Sulfur.

Given: 52 atoms K = 52 atoms/6.02 x 10²³atoms K/mole K = 9.64 x 10⁻²³ mole K atoms.

Using ratios in given equation 4K + 2S => 2K₂S

Says

       4           moles K reacts with 2 moles Sulfur, then

 8.64 x 10⁻²³ mole K reacts with X moles Sulfur

Set up ratio:

(4 moles K) / (8.64 x 10⁻²³ moles K) = (2 moles S) / X

Solve for X => X = (2 moles S x 8.64 x 10⁻²³ mole K) /  4 mole K = 4.32 x 10⁻²³ mole S used

Converting moles S to atoms S, multiply by Avogadro's Number ...

Atoms S used = 4.32 x 10⁻²³ mole S used x 6.02 x 10²³ Atoms S / mole S

=> 26.0064 Atoms S  ≈ 26 Atoms Sulfur used.

Note: This is a reasonable answer in that the balanced equation given indicates that half the number moles S reacts with K. So, one can conclude that half the number of potassium atoms would indicate the number of sulfur atoms needed. test => ¹/₂(52) = 26 atoms S.

Answer:

69%for the isotope that weighs 62.93 u and

31

%

for the isotope that weighs 64.93 u.

You can approach this problem by using a single equation; let's say the first isotope contributes to the relative atomic mass by a fraction

x

(

x

<

1

). SInce there are only 2 isotopes to consider, the fraction the other isotope contributes with will automatically be

1

−

x

.

Let's set up the equation

x

⋅

62.93

u

+

(

1

−

x

)

⋅

64.93

u

=

63.55

u

Solving this for

x

will produce

64.93

u

−

63.55

u

=

2

x

→

x

=

1.38

2

=

0.69

Multiplying these fractions (0.69 and 1 - 0.69 = 0.31) by 100% percent to get the results as a percentage will give

69

%

for the isotpe that weighs 62.93u and

31

%

for the one that weighs 64.93u.

Answer link

Answer:

Sediment increases the cost of treating drinking water and can result in odor and taste problems. Sediment can clog fish gills, reducing resistence to disease, lowering growth rates, and affecting fish egg and larvae development.

Explanation:

Answer:

"Sediment increases the cost of treating drinking water and can result in odor and taste problems. Sediment can clog fish gills, reducing resistance to disease, lowering growth rates, and affecting fish egg and larvae development".

Explanation:

Answer:

Human activities are at the root of this phenomenon.

Explanation:

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 10 g

volume = 2 mL

We have

[tex]density = \frac{10}{2} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

5.0 g/mL

Explanation:

Answer:

[tex]Cl^-[/tex]

Explanation:

Hello.

In this case, when chlorine gets ionized by gaining one electron it goes:

[tex]Cl^-[/tex]

Whose electron configuration is the same as argon:

[tex]Cl^-=Ar:1s^2,2s^2,2p^2,3s^2,3p^6[/tex]

Since the both of them have 18 electrons, they become isoelectric with the same neutral charge.

Best regards.

Answer:

A protein has four subunits whose molecular masses are 140, 80, and 60 kDa.

A disulfide bond links the two 80 kDa subunits (possibly identical).

Explanation:

Given that:

A protein has four subunits whose molecular masses are 140, 80, and 60 kDa.

A disulfide bond links the two 80 kDa subunits (possibly identical).

As a result of SDS and dithiothreitol analysis treatment, the molecular masses can not be 360 in total. They are 280, which implies that they are in short of 80 kDa. This means that there are possibilities that two groups with a molecular mass of 80 kDa which are joined by a disulfide bond.

The presence of SDS and dithiothreitol acts as a reducing agent, and they can break disulfide bonds whose pH is greater than 7, i.e. those in basic condition.

Answer:

1 molecule = 40.00 grams

1.52 molecules = 1.52*40.00

                         = 60.8 grams

Answer:

Cobalt (II) Carbonate

Explanation:

Answer:B

Explanation:

Answer:

D

Explanation:

Because a metal must reactive and able to conduct

Answer:

B.Conductivity and ductility

Explanation.

Some metals are conductive and are ductile

Conductivity is the ability to have an electric flow

Ductility is the ability to bend

Answer:

The corresponding wavelength is 2.4×10⁻³⁴ m.

Explanation:

Given data:

Mass of ball = 45.9 g  (45.9/1000 = 0.0459 kg)

Speed of ball = 61.0 m/s

Wavelength = ?

Solution:

Formula:

λ = h/mv

λ = wavelength

h = Planck's constant

m = mass

v = velocity

Now we will put the values in formula.

λ = 6.63×10⁻³⁴ kg.m².s⁻¹ / 0.0459 kg ×61.0 m/s

λ = 6.63×10⁻³⁴kg.m².s⁻¹ /2.8 Kg.m/s

λ = 2.4×10⁻³⁴ m

The corresponding wavelength is 2.4×10⁻³⁴ m.

Answer:

True

Explanation:

A homogeneous mixture is simply any mixture that is uniform in composition throughout. As long as each substance is mixed in enough to be indistinguishable from the others, it is a homogeneous mixture.

Answer:

Explanation:

Convert mole to gram by multiplying the molar mass of sodium

0.500mol Na x 22.990g = 11.495g of Na

Answer:

Argon

Explanation:

The element that would most likely be a good substitute for neon is "argon".

These two elements belong to the noble gases in Group 18(8A) of the Periodic Table. They are inert gases - they do not react chemically with other substances.

Argon, as an inert gas is often used whenever an inert atmosphere is needed. Argon is used in incandescent light bulbs. It is used to stop oxygen from corroding the filament. It is also used by welders to protect weld area.

Argon is a good substitute for neon in this context because they possess some physical properties which are similar.

Answer:

143 N

Explanation:

Answer:

which statements

Explanation:

Answer:

The positive charge of the protons in the nucleus equals the negative charge in the electron cloud.

Explanation:

I just took the assignment.

Answer:

Describe electrons.

Location: electron cloud

Charge: negative

Mass: one-two thousands amu

Explanation:

Answer:

C. Heredity

Explanation:

Homeostasis means that an organism can control its own body temperature. This is important because if we couldn't control our temperature, then our cells would have trouble working properly from being to hot or cold.

Cell organization means that our body and cells can organize themselves into groups that work together. For example, cells form groups and tissue for different organs while other cells form nerves.

Heredity is the passing of genes from parent to offspring

Answer:

bubbled

Explanation:

its simple they bubbled

signs of chemical reactions are change of

odor

bubbles

solid turns liquid

liquid turns solid

change of color

Answer:

B. 8

Explanation:

Answer:

Seven

Explanation:

SO3 has a trigonal planar structure. The most apt bonding description is that of sulphur forming three sigma bonds giving rise to the plane triangle and then the presence of three delocalized pi bonds.

Plausible resonance structures for SO3 has been shown in the image attached. In all the structures, there is none in which sulphur is pictured as having triple bonds.

image credit: socratic

Explanation: