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3 years ago

8

which of the following is a true statement about energy? a. energy can be created and destroyed. b. energy is never created nor

destroyed. c. energy is easily created, but cannot be destroyed. d. energy cannot be converted from one form to another.

1 answer:

noname [10]3 years ago

6 0

Statement C - Energy is easily created, but cannot be destroyed is true.

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How does the amount of salt dissolve in water affect the density of water

ad-work [718]

Answer:

Adding salt to the water increases the density of the solution because the salt increases the mass without changing the volume very much. When you add table salt (sodium chloride, NaCl) to water, the salt dissolves into ions, Na+ and Cl-. The volume increases by a small factor, but the mass increases by a bigger factor.

Explanation:

3 0

3 years ago

What is the volume, in milliliters, occupied by 30.07 g of an object of density equal to

den301095 [7]

Answer:

$\boxed {\tt 20.317567567568 \ mL}$

Explanation:

The density formula is:

$d=\frac{m}{v}$

Let's rearrange the formula for $v$ . the volume. Multiply both sides by $v$ , then divide by $d$ .

$d*v=\frac{m}{v}*v$

$d*v=m$

$\frac{d*v}{d}=\frac{m}{d}$

$v=\frac{m}{d}$

The volume can be found by dividing the mass by the density. The mass of the object is 30.07 grams and the density is 1.48 grams per milliliter.

$m= 30.07 \ g\\d= 1.48 \ g/mL$

$v=\frac{30.07 \ g}{1.48 \ g/mL}$

Divide. Note, when dividing, the grams, or $g$ will cancel out.

$v= \frac{30.07}{1.48 \ mL}$

$v=20.317567567568 \ mL$

The volume of the object is 20.317567567568 milliliters.

3 0

3 years ago

An element has 2 neutrons, 2 electrons and 2 protons. Which element does this describe? Is it a neutral atom, isotope, or an ion

Y_Kistochka [10]

Considering the definition of neutral atom, mass number and net charge, the element is a neutral atom, with a net charge equal to zero and a mass number of 4.

<h3>Neutral atom and ion</h3>

All atoms are made up of subatomic particles: protons and neutrons, which are part of their nucleus, and electrons, which revolve around them. Protons are positively charged, neutrons are neutrally charged, and electrons are negatively charged.

A neutral atom is one that has no electrical charge because it has the same number of protons and electrons.

In contrast, ions are atoms or groups of atoms that have an electrical charge and are formed by the gain or loss of electrons from the atom.

<h3>Mass number</h3>

The mass number tells us the total number of particles in the nucleus. That is, the mass number is the sum of the number of protons and the number of neutrons in the atomic nucleus:

Mass number = (number of protons) + (number of neutrons)

It is represented by the letter A.

<h3>Net charge</h3>

The net charge corresponds to the algebraic sum of all the charges that a atom possesses.

<h3>This case</h3>

In this case, an element has:

2 neutrons.
2 electrons.
2 protons.

Then, the net charge is calculated as:

net charge= 2× 0 [charge of neutron] + 2× (+1) [charge of proton] + 2× (-1) [charge of electron]

<u><em>net charge= 0</em></u>

This element has no electrical charge, or net charge is zero. Then, the element is a neutral atom.

On the other hand, the mass number is the sum of the number of protons and the number of neutrons. So, in this case:

mass number= 2 protons + 2 neutrons

<u><em>mass number= 4</em></u>

Finally, the element is a neutral atom, with a net charge equal to zero and a mass number of 4.

Learn more about

neutral atom:

brainly.com/question/24652228

brainly.com/question/18242008

brainly.com/question/18330612

mass number:

brainly.com/question/1758023

brainly.com/question/5527493

net charge:

brainly.com/question/24752359

#SPJ1

4 0

1 year ago

What element has 7 valence electrons

PolarNik [594]

I believe the answer would be halogens

7 0

3 years ago

Matter is made up of particle. Which of the following statement is true about these particle? A. A partical that make up soild d

Andrews [41]

Answer: Answer A

Explanation: sorry if I'm wrong but I'm sharing what I know

8 0

3 years ago