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3 years ago

according to newtons second law of motion, if a force remains the same but mass increases, then acceleration will...

1 answer:

4 0

The acceleration of an object increases with increased force and decreases with increased mass. The law also states that the direction in which an object accelerates is the same as the direction of the force.

http://www.classzone.com/vpg_ebooks/ml_sci_gr8/accessibility/ml_sci_gr8/page_50.pdf

I found this answer from this link. Hop it helps!

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Identify from the following list of molecules and ions which behave as Lewis acids: CO2, NH3, BCl3, Fe3+. (A) CO2 and NH3 (B) NH

Anettt [7]

Answer : The correct option is, (D) CO₂, BCl₃, and Fe³⁺

Explanation :

According to the Lewis concept, an acid is defined as a substance that accepts electron pairs and base is defined as a substance which donates electron pairs.

(a) $CO_2$

It is a Lewis-acid because it can accepts electron pairs.

(b) $NH_3$

It is not a Lewis-acid because it can not accepts electron pairs but it is a base because it can donates and accept hydrogen ion.

(c) $BCl_3$

It is a Lewis-acid because it can accepts electron pairs because it has an incomplete octet and an empty 2p orbital.

(d) $Fe^{3+}$

It is a Lewis-acid because it can accepts electron pairs.

Hence, the ions which behave as Lewis acids are, CO₂, BCl₃, and Fe³⁺

6 0

3 years ago

The mass percent of Cl⁻ in a seawater sample is determined by titrating 25.00 mL of seawater with AgNO₃ solution, causing a prec

Serga [27]

Answer:

2.5 %

Explanation:

Considering:

$Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}$

Or,

$Moles =Molarity \times {Volume\ of\ the\ solution}$

Given :

For $AgNO_3$ :

Molarity = 0.2850 M

Volume = 63.30 mL

The conversion of mL to L is shown below:

1 mL = 10⁻³ L

Thus, volume = 63.30 × 10⁻³ L

Thus, moles of $AgNO_3$ :

$Moles=0.2850 \times {63.30\times 10^{-3}}\ moles$

Moles of $AgNO_3$ = 0.0180405 moles

Moles of $AgNO_3$ = Moles of $Cl^-$

Thus, Moles of $Cl^-$ = 0.0180405 moles

Molar mass of $Cl^-$ = 35.453 g/mol

Mass = Moles * Molar mass = 0.0180405 moles * 35.453 g/mol = 0.6396 g

Volume of sea water = 25.00 mL

Density = 1.024 g/mL

Density = Mass / Volume

Mass = Density * Volume = 1.024 g/mL * 25.00 mL = 25.6 g

$Mass\ \%=\frac{Mass_{Chloride ion}}{Total\ mass}\times 100$

$Mass\ \%=\frac{0.6396}{25.6}\times 100$

<u>Mass percent of Cl⁻ = 2.5 %</u>

4 0

3 years ago

What Group is Zn (zinc) in?<br> O A. 4<br> O B. 2A<br> O C. 12<br> O D. 30

Oxana [17]

I believe it’s (C.12)

3 0

4 years ago

Which is a disadvantage of using chemical indicators? they are expensive to use. they measure ph directly. they must be selected

dexar [7]

Chemical indicators are the chemical reagents that show the change in reaction by changing color. Chemical indicators must be chosen with a narrow pH range.

<h3>What are indicators?</h3>

Indicators are the solutions or the substances used for the qualitative and the quantitative measurement by a change in color because of the absence or the presence of the sample concentration.

The chemical indicators cannot detect the exact pH and should be used with a narrow range of pH.

Therefore, option C. the narrow range of pH is the disadvantage of chemical indicators.

Learn more about chemical indicators here:

brainly.com/question/15114406

4 0

2 years ago

What is the wavelength of the line corresponding to n=4 in the balmer series? express your answer in nanometers to three signifi

liq [111]

Expression for the Balmer series to find the wavelength of the spectral line is as follows:
1 / λ = R $(\frac{1}{2^{2} } - \frac{1}{ n^{2}} )$
Where, λ is wavelength, R is Rydberg constant, and n is integral value (4 here → Fourth level)
Substitute 1.097 x 10⁷ m⁻¹ for R and 4 for n in the above equation
1 / λ = (1.097 x 10⁷ m⁻¹) $(\frac{1}{2^{2} } - \frac{1}{4^{2} } )$
= 0.20568 x 10⁷ m⁻¹
λ = 4.86 x 10⁻⁷ m
since 1 m = 10⁹ nm
λ = 486 nm

8 0

3 years ago