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2 years ago

Can you Help me please...

Chemistry

1 answer:

mylen [45]2 years ago

8 0

Answer:

590J or 590.4J :)

Explanation:

2.46 x 6 (35-29= 6) x 40 = 590.4J

Nearest whole number : 590J

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5. Which statement is true about electronegativity?

Anit [1.1K]

Answer:

Electronegativity generally increases from left to right across a period,

Explanation:

The true statement from the given choices is that electronegativity generally increases from left to right across a period.

Electronegativity is the measure of the relative tendency with which an atom of the element attract valence electrons in a chemical bond.

Across a period electronegativity increases from left to right and decreases down the group.

This is due to reduction in metallic properties as we move across the period from left to right.

3 0

2 years ago

NEED A AWNSER ASAP PLEASE!!!!

Gnoma [55]

Last one cuz it stay in the air for a while then swings making it kinetic

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2 years ago

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A sample of oxalic acid (a diprotic acid of the formula H2C2O4) is dissolved in enough water to make 1.00 L of solution. A 100.0

OleMash [197]

Answer: The mass of original oxalic acid sample is 6.75 grams

Explanation:

To calculate the concentration of acid, we use the equation given by neutralization reaction:

$n_1M_1V_1=n_2M_2V_2$

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of acid which is $H_2C_2O_4$

$n_2,M_2\text{ and }V_2$ are the n-factor, molarity and volume of base which is NaOH.

We are given:

$n_1=2\\M_1=?M\\V_1=100.0mL\\n_2=1\\M_2=0.750M\\V_2=20.0mL$

Putting values in above equation, we get:

$2\times M_1\times 100.0=1\times 0.750\times 20.0\\\\M_1=\frac{1\times 0.750\times 20.0}{2\times 100.0}=0.075M$

To calculate the mass of solute, we use the equation used to calculate the molarity of solution:

$\text{Molarity of the solution}=\frac{\text{Mass of solute}}{\text{Molar mass of solute}\times \text{Volume of solution (in L)}}$

Given mass of oxalic acid = ? g

Molar mass of oxalic acid = 90 g/mol

Molarity of solution = 0.075 M

Volume of solution = 1.00 L

Putting values in above equation, we get:

$0.075M=\frac{\text{Mass of oxalic acid}}{90g/mol\times 1L}\\\\\text{Mass of oxalic acid}=(0.075\times 90\times 1)=6.75g$

Hence, the mass of original oxalic acid sample is 6.75 grams

7 0

2 years ago

1. A scientific hypothesis can become a theory if ______.

Rus_ich [418]

1. A scientific hypothesis can become a theory if the hypothesis is tested extensively and competing hypothesis are eliminated. A scientific hypothesis is a proposed explanation made on the basis of reasoning without any assumption. For hypothesis to be termed a scientific hypothesis, it has to be something that can be supported or refuted through carefully crafted experimentation or observation.

2. A preliminary untested explanation that tries to explain how or why thing happen in the manner observed is a scientific hypothesis. A primary trait of a hypothesis is that something can be tested and that those tests can be replicated. A hypothesis is often examined by multiples scientists to ensure the integrity and veracity of the experiment. The process can take years, and in many cases hypothesis do not go any further in the scientific method as it is difficult to gather sufficient supporting evidence.

4 0

3 years ago

(NH4)2CO3à NH3 + CO2 + H2O For this unbalanced chemical equation, what is the coefficient for carbon dioxide when the equation i

nasty-shy [4]

Answer:

The answer to your question is the letter A. 1

Explanation:

Data

Chemical reaction

(NH₄)₂CO₃ ⇒ NH₃ + CO₂ + H₂O

Reactants Elements Products

2 Nitrogen 1

1 Carbon 1

8 Hydrogen 5

3 Oxygen 3

This reaction is unbalanced

(NH₄)₂CO₃ ⇒ 2NH₃ + CO₂ + H₂O

Reactants Elements Products

2 Nitrogen 2

1 Carbon 1

8 Hydrogen 8

3 Oxygen 3

Now, the reaction is balanced,

The coefficient for Carbon dioxide is 1

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2 years ago

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