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3 years ago

Which expression represents the algebraic phrase " twelve times the sum of a number and seven-tenths

Chemistry

1 answer:

Romashka-Z-Leto [24]3 years ago

3 0

Answer:

12 (x + 7/10)

Explanation:

Algebra is a branch or aspect of mathematics that deals with the combination of numbers and alphabetic letters. In other words, a mathematical expression that contains letters is termed "algebraic".

According to this question, the following algebraic phase is given: "twelve times the sum of a number and seven-tenths". The algebraic expression is as follows:

- The sum of a number, which is represented by letter "x" and seven-tenths, which mathematically means 7/10 is x + 7/10.

- twelve (12) multiplied by this will give

12 × x + 7/10

= 12 (x + 7/10)

= 12x + 84/10

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Write a balanced equation for the nuclear reaction in which neon-23 decays to form sodium-23

Bond [772]

Explanation:

The nuclear reaction is a radioactive decay by the emission of a beta particle.

Beta emission increases the mass number of a nuclei.

A beta particle is a particle that closely resembles an electron. When a particle decays by emitting beta particles, the mass number remains the same but the atomic number increases.

Beta particle is designated as °₋₁β

²³₁₀ Ne ⇒ ²³₁₁Na + °₋₁β + energy

learn more:

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3 years ago

Which of the following are the physical properties of compounds? Select all that apply.

BlackZzzverrR [31]

A. Smell (Oder) B. Color and D I’m pretty sure because the common properties are Color, Oder, Melting point, and boiling point

8 0

3 years ago

In the reaction: C6H6 + O2 = CO2 + H2O If 26.2 grams of C6H6 is reacted in a 0.250-liter container and this reaction is carried

Lelechka [254]

<h3>Answer:</h3>

43.33 atm

<h3>Explanation:</h3>

We are given;

Mass of C₆H₆ = 26.2 g

Volume of the container = 0.25 L

Temperature = 395 K

We are required to calculate the pressure inside the container;

First, we calculate the number of moles of C₆H₆

Molar mass of C₆H₆ = 78.1118 g/mol.

But; Moles = mass ÷ Molar mass

Moles of C₆H₆ = 26.2 g ÷ 78.1118 g/mol.

= 0.335 moles C₆H₆

Second, we calculate the pressure, using the ideal gas equation;

Using the ideal gas equation, PV = nRT , Where R is the ideal gas constant, 0.082057 L.atm/mol.K

Therefore;

P = nRT ÷ V

= (0.335 mol × 0.082057 × 395 K) ÷ 0.25 L

= 43.433 atm

Therefore, the pressure inside the container is 43.33 atm

6 0

4 years ago

For the chemical reaction Na 2 CO 3 + Ca ( NO 3 ) 2 ⟶ CaCO 3 + 2 NaNO 3 how many moles of calcium carbonate will be produced fro

sp2606 [1]

Na2CO3 mol = mass/rfm
= 91.9 / ( 23+23+12+16+16+16)
= 91.9/106
=919/1060 or roughly 0.867

Mole ratio of sodium carbonate to calcium carbonate is 1:1

Therefore calcium carbonate mol = mass/rfm

919/1060 = mass / (40+12+16+16+16)
919/1060 = mass / 100
Mass = 919/1060 x 100
= 4595/53 or 86.7g to 3 significant figures

7 0

3 years ago

Write a balanced half-reaction for the reduction of bismuth oxide ion to bismuth ion in basic aqueous solution. Be sure to add p

Butoxors [25]

Answer:

$3H_2O+(Bi^{5+}O_3)^-\rightarrow Bi^{3+}+6OH^-$

Explanation:

Hello there!

In this case, according to the required half-reaction, we start by setting it up from bismuth (V) oxide ion to bismuth (III) ion:

$BiO_3^-\rightarrow Bi^{3+}$

Thus, next realize that the oxidation state of Bi in BiO3^- is 5+ because oxygen is 2- (-2*3+x=-1;x=-1+6;x=+5), so we obtain:

$(Bi^{5+}O_3)^-\rightarrow Bi^{3+}$

Thereafter, we realize three water molecules are needed on the right in order to balance the oxygens and consequently 6 hydrogen atoms on the left to balance hydrogen:

$6H^++(Bi^{5+}O_3)^-\rightarrow Bi^{3+}+3H_2O$

Now, since the balance is is basic media, we add six molecules of hydroxide ions in order to produce water with the hydrogen ones:

$6OH^-+6H^++(Bi^{5+}O_3)^-\rightarrow Bi^{3+}+3H_2O+6OH^-\\\\6H_2O+(Bi^{5+}O_3)^-\rightarrow Bi^{3+}+3H_2O+6OH^-\\\\6H_2O-3H_2O+(Bi^{5+}O_3)^-\rightarrow Bi^{3+}+6OH^-$

Then, we accommodate the waters to obtain:

$3H_2O+(Bi^{5+}O_3)^-\rightarrow Bi^{3+}+6OH^-$

Best regards!

7 0

3 years ago