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3 years ago

10

An electric clock in a classroom will not run if it not plugged into an electric outlet what does the clock get from the electri

c current from the outlet?
A) batteries

B)chemicals

C) energy

D)time of day

2 answers:

GrogVix [38]3 years ago

5 0

It might be energy or batteries I'm not saying it's right but I might be wrong

algol [13]3 years ago

3 0

C: energy I might be wrong

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10.000g of boron (B) combines with hydrogento form 11.554g of a pure compound. What is the empirical formula of this compound?

Citrus2011 [14]

Answer:

B3H5

Explanation:

The law of conservation of mass states that matter in an closed system is neither created nor destroyed by physical transformations or chemical reactions but changes from one form to the other.

That is, the sum of masses of the reactants = The sum of masses of the product

10.00g of Boron + x grams of Hydrogen = 11.55g of the product

Mass of hydrogen = 11.55 - 10.00 = 1.55g

Molar mass of Boron = 10.811g

Molar mass of Hydrogen = 1.00784g

Number of moles of Boron = (mass of Boron)/(molar mass of Boron) = 10/10.811 = 0.9249 mols

Number of moles of Hydrogen = (mass of Hydrogen)/(molar mass of Hydrogen) = 1.55/1.00784 =1.5379mols

0.9249 mols of Boron combines with 1.5379mols of Hydrogen

Dividing both sides mols by 0.9249 gives

1 mole of Boron combines with 1.66266 mols of Hydrogen

Converting 1.66266 to fractions we have 1.66266 approximately 5/3

or 1 mole of Boron combines with 5/3 moles of Hydrogen

Multiplying both sides by 3 we have

3 moles of Boron combines with 5 moles of Hydrogen

Molecular formula of the compound is

B3H5

4 0

4 years ago

What is the density of marble that has a mass of 4.3 g and a volume of 2.7 cm?

KiRa [710]

Explanation:

density(d) = mass(m) × volume(v)

given:

mass = 4.3 g = 0.0043 Kg

volume = 2.7 cm³ = 0.027 m³

= 0.0043 Kg / 0.0027 m³

= 0.15 Kg/m³

3 0

3 years ago

If 10g of sodium react with an unlimited amount of chlorine how much sodium chloride will get produced?

puteri [66]

Answer: Amount of sodium chloride produced is 25.43 grams.

Explanation:

To calculate the moles:

$\text{Number of moles}=\frac{\text{Given mass}}{\textMolar mass}}$

Given: Mass of sodium = 10 g

Molar mass of sodium = 23g/mol

$\text{Moles of sodium}=\frac{10g}{23g/mol}=0.4347mol$

The balanced equation is:

$2Na+Cl_2\rightarrow 2NaCl$

By Stoichiometry of the reaction,

2 moles of sodium produces 2 moles of sodium chloride

So, 0.4347 moles of sodium will produce = $\frac{2}{2}\times 0.4347=0.4347mol$ of sodium chloride.

Molar mass of sodium chloride = 58.5 g/mol

Putting values in equation 1, we get:

$0.4347mol=\frac{\text{Mass of NaCl}}{58.5g/mol}=25.43g$

Hence, amount of sodium chloride produced is 25.43 grams.

5 0

4 years ago

Definition of steepest

andrey2020 [161]

<span>Hi, friend.
Steepest - Being steep to the greatest degree.
Steep - S</span>harply angled.
Example: When hiking trails lead straight up mountainsides, they've got a steep incline.
Hope this helps!

5 0

4 years ago

Read 2 more answers

When a 235 92U 92235U nucleus is bombarded by neutrons (10n01n) it undergoes a fission reaction, resulting in the formation of t

r-ruslan [8.4K]

Answer:

139/56 Ba

Explanation:

In writing nuclear equations, there must be a balance of the mass and charge on both sides of the reaction equation. That is, the sum of masses on the lefthand side of the nuclear reaction equation must equal the sum of masses on the righthand side of the nuclear reaction equation. Similarly, the charges on the lefthand side of the nuclear reaction equation must equal the sum of the charges on the right hand side of the nuclear reaction equation.

Hence, the isotope of barium formed in the equation mentioned in the question is 139/56 Ba.

6 0

4 years ago