What is mass number?

Answers

Answer 1

Answer: Mass number on the periodic table is the bigger number. For example, Hydrogen's atomic number is 1, and mass number is 1.008. The mass number (rounded) is the total number of neutrons and protons in an atom.

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Driving cars lowers the pH of the oceans by _______.a.
releasing CO2 that dissolves and forms acid in the oceans
b.
releasing pollutants that lead to smog
c.
releasing CO that dissolves and forms acid in the oceans
d.
releasing pollutants that lead to acid rain

Answers

Answer: Option (a) is the correct answer.

Explanation:

When $CO_(2)$ is released from driving cars, some of which is absorbed by the plants but the rest of $CO_(2)$ reacts with the sea or ocean water.

It reacts with water molecules and changes the chemistry of ocean water by lowering its pH. As it is known that when pH becomes lower then the substance becomes acidic in nature.

Thus, we can conclude that driving cars lowers the pH of the oceans by releasing $CO_(2)$ that dissolves and forms acid in the oceans.

A) releasing CO2 that dissolves and forms acid in the oceans (i think i'm sorry if its wrong)

I NEED HELP!!!!Which group contains elements that are most likely to have similar properties?
A. lithium, beryllium, and boron
B. nitrogen, arsenic, and antimony
C. potassium, calcium, and gallium
D. cesium, platinum, and radon

Answers

Answer: The correct answer is option B.

Explanation:

Elements which lie in the same group most likely have similar chemical properties.

From the given options:

Option 1: Lithium, beryllium and boron.

Lithium lies in Group 1, Beryllium in group 2 and boron in Group 13. As, these elements do not lie in the same group and hence, the properties of these elements will not be the same.

Option 2: Nitrogen, arsenic and antimony

All these elements lie in Group 15 of the periodic table and hence will have the same properties.

Option 3: Potassium, calcium and Gallium

Potassium lies in Group 1, Calcium in group 2 and Gallium in Group 13. As, these elements do not lie in the same group and hence, the properties of these elements will not be the same.

Option 4: Cesium, Platinum and Radon.

Cesium lies in Group 1, Platinum in group 10 and Radon in Group 18. As, these elements do not lie in the same group and hence, the properties of these elements will not be the same.

Therefore, the correct option is Option B.

the answer would be B. Because elements in the same group have similar properties.

Ions can have a positive or negative charge. false or true

Answers

True. Ions can have a positive or negative charge.

I want to say that its true

What is the identity of a sample that has a mass of 8.97 g and a volume of 0.79 cm3?A.copper
B.gold
C.lead
D.iron

Answers

Answer: The correct option is Option C.

Explanation:

To identify the sample, we will determine the density of the unknown sample and match it with the specific densities. The equation used to calculate the density of a sample is given by:

$Density=(Mass)/(Volume)$

We are given:

Mass of the sample = 8.97 g

Volume of the sample = $0.79cm^3$

Putting values in above equation, we get:

$\text{Density of the sample}=(8.97g)/(0.79cm^3)=11.35g/cm^3$

This value of density matches the specific density of lead.

Hence, the correct option is Option C.

Calculate the density:

$m=8.97 \ g \nV=0.79 \ cm^3 \n \n\rho=(m)/(V)=(8.79 \ g)/(0.79 \ cm^3) \approx 11.35 \ (g)/(cm^3)$

It's the density of lead, so the answer is C.

The emission spectrum of hydrogen shows discrete, bright, colored lines. Which characteristic of the Bohr model is best supported by this observation?

Answers

Answer : Electrons cannot exist in locations other than in specific orbits.

Explanation :

The emission spectrum of hydrogen shows discrete, bright, colored lines. The characteristic that the Bohr model supported with observation is that electrons cannot exist in location other than in specific orbits.

According to characteristics of Bohr's atomic model;

The energy levels of electrons are discrete, this is the reason which is shown by hydrogen emission spectrum as discrete, bright, colored lines.

Also, electrons are seen to orbit around the nucleus in orbits which has a set size and energy with a defined path.

Electrons can jump from one energy level to another, which results after absorbing or emitting an electromagnetic radiation with a frequency ν.

The characteristic of the Bohr model that would best support his observation is this assumption: "The energy of the electron in an orbit is proportional to its distance from the nucleus. The further the electron is from the nucleus, the more energy it has." The discrete, bright, colored lines might represent the electrons and its distance from the nucleus. The lights are caused by the energy it has.

Given the balanced equation:I + I==> I2
Which statement describes the process represented by this equation?
(1) A bond is formed as energy is absorbed.
(2) A bond is formed and energy is released.
(3) A bond is broken as energy is absorbed.
(4) A bond is broken and energy is released.

Answers

The answer is (2) A bond is formed and energy is released. The left side of equation is I atom and the right side of equation is I2 molecule. So the bond is formed between I atom to form I2 molecule. And forming bond will release energy while breaking bond will absorb energy.

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What part of a divers body is most effected by pressure?

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