Which of these phrases best describes an atom?(1) a positive nucleus surrounded by a hard negative shell(2) a positive nucleus surrounded by a cloud of negative charges
(3) a hard sphere with positive particles uniformly embedded
(4) a hard sphere with negative particles uniformly embedded

Answers

Answer 1

Answer: number two because of yall study this in sciwnce class yall will get it

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Justify water is compound

Answers

Water is a compound. A compound is made up of two or more elements. In the case of water, or H2O, there are 2 hydrogen atoms present and 1 oxygen atom. I hope this helps you on your assignment. Good luck!

Although incineration can break down harmful chemicals, the byproduct is hazardous.a. True
b. False

Answers

Answer: The given statement is true.

Explanation:

Incineration: It is a technique in which organic substance present in waste material is burned down to break them into its components.

For: Example : Burning of powder of wooden chips gives carbon dioxide gas ,nitrogen-dioxide in small amounts and heat energy.

Although incineration can break down harmful chemicals but the by-product formed are hazardous because:

Oxides of nitrogen and sulfurs are also released which pollutes the air and becomes the main cause for acid rains.
Green house gases are produced which disturbs the balance of atmosphere and climate.
Increases air pollution by which it becomes unfit to breathe in.
Also pollutes soil.

Hence, the given statement is true.

A, true is the answer and cluke u help me please

What is the volume of 0.30 M NaOH(aq) neededto completely neutralize 15.0 milliliters of
0.80 M HCl(aq)?
(1) 3.6 mL (3) 20. mL
(2) 5.6 mL (4) 40. mL

Answers

Answer: 4) 40 ml

Solution :

According to the neutralization law,

$M_1V_1=M_2V_2$

where,

$M_1$ = molarity of NaOH solution = 0.30 M

$V_1$ = volume of NaOH solution = ?

$M_2$ = molarity of HCl solution = 0.80 M

$V_2$ = volume of HCl solution = 15 ml

Now put all the given values in the above law, we get the volume of NaOH solution.

$(0.30M)* V_1=(0.80M)* (15ml)$

$V_1=40ml$

Therefore, the volume of 0.30 M NaOH required to neutralize 15 ml of 0.80 M HCl is 40 ml.

Final answer:

The volume of 0.30 M NaOH(aq) needed to neutralize 15.0 milliliters of 0.80 M HCl(aq) is 40 milliliters.

Explanation:

The volume of 0.30 M NaOH(aq) needed to neutralize 15.0 milliliters of 0.80 M HCl(aq) can be determined using the concept of stoichiometry and the balanced equation for the reaction between NaOH and HCl. The balanced equation is:

NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

From the balanced equation, we can see that 1 mole of NaOH reacts with 1 mole of HCl. Therefore, the number of moles of HCl in 15.0 milliliters of 0.80 M HCl solution can be calculated as:

Moles of HCl = Volume (in liters) × Molarity = 0.015 liters × 0.80 moles/liter = 0.012 moles

Since 1 mole of NaOH reacts with 1 mole of HCl, we need 0.012 moles of NaOH. The volume of 0.30 M NaOH solution can be determined by rearranging the equation:

Volume (in liters) = Moles / Molarity = 0.012 moles / 0.30 moles/liter = 0.04 liters = 40 milliliters

Therefore, the volume of 0.30 M NaOH(aq) needed to completely neutralize 15.0 milliliters of 0.80 M HCl(aq) is 40 milliliters.

Learn more about Volume calculation here:

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Density is a measure of mass divided by volume

weight divided by area

volume divided by weight

mass divided by area

Answers

Density is mass divided by volume.

In an exothermic reaction the bonding energy of the product is ?

Answers

In an exothermic reaction, heat is released. Heat released is determined by finding the difference of the total bonding energy of the product and the reactants. Since the heat released is negative, the bonding energy of the products should be greater than that of the reactants.

Electrical motors work based on the fact that a wire carrying current can produce a ______________ field, which can lead to production of mechanical energy through rotation. A gravitational B parallel C magnetic D alternating