How does the number of protons compare to the number ofelectrons in an anion?
a There are more electrons than protons.
b There are more protons than electrons.
c
There is no consistent relationship between the
numbers of protons and electrons.
d There are equal numbers of protons and electrons.

Answers

Answer 1

Answer: It is A).
Electrons are negatively charged and an anion is a negatively charged ion so that means there is more electrons(negative charge) than protons(positive charge) in an anion

Answer 2

Answer:

Answer:B is the right answer

Explanation:

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Which organic compound is unsaturated?(1) 2-methylbutane (3) 2-hexanol
(2) 2-chloropropane (4) 2-pentene

Answers

The answer is (4) 2-pentene. The pentene belongs to olefin and has double bonds between the carbon atoms. And the other three belongs to alkane which don't have double bonds. So the pentene is unsaturated.

Where are people exposed to chemicals?O A. Mostly in public buildings
O B. Only in the home
C. Mostly outside
O D. Everywhere

Answers

Answer:

I believe the correct answer is D.

Explanation:

You are breathing in dinitrogen and dioxygen. You exhale dinitrogen and carbon dioxide. And the atmosphere contains traces of other gases. You drink water. You have a wash with water, and soap. You eat carbohydrates and proteins. You ride to work on a vehicle powered by hydrocarbons, which spits out carbon dioxide exhaust fumes, and also some nitrogen oxides. And so your exposure to chemicals is pervasive, and unavoidable.

Answer:

Explanation:

Identify the isotope that has atoms with 28 neutrons, 23 protons, and 23 electronsA. ^28 Ni
B. ^23 V
C. ^23 Mn
D. ^51 Sb
E. ^51 V

Answers

Answer:

E. ^51 V

Atomic number (number of protons in the nucleus): 23

Atomic symbol (on the periodic table of the elements): V

Atomic weight (average mass of the atom): 50.9415

Density: grams per cubic centimeter

Phase at room temperature: Solid

Melting point: 3,470 degrees Fahrenheit (1,910 degrees Celsius)

Boiling point: 6,165 F (3,407 C)

Number of isotopes (atoms of the same element with a different number of neutrons): 2; one stable V-51; one radioactive V-50

Most common isotopes: V-51 (99.75 percent natural abundance)

What element is this? How do you know?

Answers

Atom is the most basic unit of matter. They are the general term used to describe pieces of matter. But a different kind of atom makes up an element. A combination of atom of different elements creates a molecule. For example, you have water; it has a chemical formula of H2O. If you separate H from O, you have two atoms. Two atoms for hydrogen and one atom for oxygen. However, they are of different elements. And when you combine them to form H2O, you create a molecule.

A 250-mL aqueous solution contains 1.56 mc025-1.jpg 10–5 g of methanol and has a density of 1.03 g/mL. What is the concentration in ppm?A 6.1 X 10^-8 ppm
B 1.5 X 1-^-5 ppm
C 0.061 ppm
D 15 ppm

Answers

The right answer for the question that is being asked and shown above is that: "B 1.5 X 1-^-5 ppm." A 250-mL aqueous solution contains 1.56 mc025-1.jpg 10–5 g of methanol and has a density of 1.03 g/mL. The concentration in ppm is that 1.5 X 1-^-5 ppm

Answer: The correct option is C.

Explanation: ppm is used to measure the concentration of solute in a given volume of solution. ppm is basically parts per million.

Mathematically,

$ppm=\frac{\text{Mass of solute (in mg)}}{\text{Volume of solution (in L)}}$

We are given:

Mass of methanol = $1.56* 10^(-5)g=1.56* 10^(-2)mg$ (Conversion Factor : 1g = 1000mg)

Volume of solution = 250 mL = 0.250L (Conversion Factor : 1L = 1000mL)

Putting values in above equation, we get:

$ppm=(1.56* 10^(-2)mg)/(0.250L)$

Concentration of methanol = 0.062ppm

Hence, the correct option is C.

Which element has the greatest density at stp? calcium, chlorine, carbon or copper?

Answers

density = mass/volume

Since at STP, one mole of any gas occupies 22.4 liters, therefore, the volume is equal.
So, we will arrange based on mass.

From the periodic table:
mass of carbon = 12 grams
mass of calcium = 40 grams
mass of chlorine = 35.5 grams
mass of copper = 63.5 grams

Based on this:
copper has the highest density.

The element that has maximum density at STP is copper.

Further explanation:

The property is a unique feature of the substance that differentiates it from the other substances. It is classified into two types:

1. Intensive properties:

These are the properties that depend on the nature of the substance. These don't depend on the size of the system. Their values remain unaltered even if the system is further divided into a number of subsystems. Temperature, refractive index, concentration, pressure, and density are some of the examples of intensive properties.

2. Extensive properties:

These are the properties that depend on the amount of the substance. These are additive in nature when a single system is divided into many subsystems. Mass, energy, size, weight, and length are some of the examples of extensive properties.

Density is a characteristic property of the substance. It is defined as the mass per unit volume. It is generally represented by $\rho$ .

The formula to calculate the density of the liquid is,

$\text{Density of liquid}(\rho)=\frac{\text{Mass of liquid(M)}}{\text{Volume of liquid (V)}}$

Standard Temperature and Pressure is denoted as STP and the volume of 1 mole of gas at STP is 22.4 litres.

The volume is constant and therefore density is directly related to mass.

Among the given elements copper has the highest molar mass and that is $63.5\;{\text{g/mol}}$ . Therefore the element that has maximum density at STP is copper.