1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
padilas [110]
2 years ago
5

Climate change as we know it today is

Chemistry
1 answer:
USPshnik [31]2 years ago
7 0
The answer is a!!!!!!!!!!
You might be interested in
Which of these is an example of a physical change? sugar dissolving in warm water iron rusting in the presence of moist air wood
WARRIOR [948]
The correct option is; SUGAR DISSOLVING IN WARM WATER.
There are two types of change in chemistry; physical and chemical changes.
A physical change is a type of change in which no new substance is formed while a chemical change is a type of change in which a new substance is formed. 
Dissolving sugar in warm water is a physical change because no new substance is formed and the sugar can easily be recovered from the water by evaporating the water.
3 0
3 years ago
Read 2 more answers
As the temperature of a gas sample increases, the number of molecules and volume remaining constant, the pressure exerted by the
Luba_88 [7]

Answer:

A. increases

Explanation:

According to the Gay-Lussac's law:-

Thus, at constant volume and number of moles, Pressure of the gas is directly proportional to the temperature of  the gas.

P ∝ T

Also,  it can be written as:-

\frac {P_1}{T_1}=\frac {P_2}{T_2}

Thus, if the temperature is increased, the pressure exerted by the gas also increases.

8 0
3 years ago
What is the mass of 0.80 moles of Mg? (1 point)
Aneli [31]

Answer:

m = 19 grams

Explanation:

Given that,

No. of moles, n = 0.8

The molar mass of magnesium, M = 24.305 u

We need to find the mass of 0.80 moles of Mg. We know that given mass to the molar mass is equal to no of moles. Let the mass is m. So,

n=\dfrac{m}{M}\\\\m=n\times M\\\\m=0.8\times 24.305 \\\\m=19.444\ \text{grams}

or

m = 19 grams

So, the mass of 0.8 moles of Mg is 19 grams.

6 0
3 years ago
Select all the true statements. When an atom gains an electron, it becomes a cation. Anions carry a positive charge. The Cl− and
REY [17]

Answer:

The statements 4 and 5 are true.

Explanation:

1. When an atom gains an electron it becomes negatively charged. This negatively charged species is called anion.

A + e⁻ →  A⁻ (anion)

Therefore, the statement 1 is false.

2.  An anion is formed when an atom gains an electron and becomes negatively charged. Therefore, an anion is a negatively charged species.

A + e⁻ →  A⁻ (anion)

Therefore, the statement 2 is false.

3. The atomic number of chlorine atom Cl is 17 and atomic number of bromine atom Br is 35.

Since, for neutral atom, the atomic number of an atom is equal to the number of electrons present in that atom.

Therefore, the number of electrons in Cl atom is 17 and the number of electrons in Br atom is 35.

When the Cl atom gains one electron it forms Cl⁻ ion and when the Br atom gains one electron it forms Br⁻ ion.

Therefore, the number of electrons in Cl⁻ ion is 17 + 1 = 18 electrons

and the number of electrons in Br⁻ ion is 35 + 1 = 36 electrons

Therefore, Cl⁻ and Br⁻ ions do not have the same number of electrons.

Therefore, the statement 3 is false.

4. When potassium atom (K) loses one electron it forms a positively charged species called potassium cation (K⁺).

K  → K⁺ + e⁻

Therefore, the statement 4 is true.

5. The atomic number of Fe atom is 26.

Since, the atomic number of an atom is equal to the number of protons present in that atom.

When the Fe atom loses two electrons to form Fe²⁺ and when the Fe atom loses three electrons to form Fe³⁺ ion, the number of protons remains the same.

Therefore, the ions Fe²⁺ and Fe³⁺ have the same number of protons.

Therefore, the statement 5 is true.

6. The atomic number of copper atom Cu is 29.

Since, for neutral atom, the atomic number of an atom is equal to the number of electrons present in that atom.

Therefore, the number of electrons in Cu atom is 29

When the Cu atom loses one electron it forms Cu⁺ ion and when the Cu atom loses two electrons it forms Cu²⁺ ion.

Cu  → Cu⁺ + e⁻                and    Cu  → Cu²⁺ + 2e⁻

Therefore, the number of electrons in Cu⁺ ion is 29 - 1 = 28 electrons

and the number of electrons in Cu²⁺ ion is 29 - 2 = 27 electrons

Therefore,  Cu⁺ ion and Cu²⁺ ion do not have the same number of electrons.

Therefore, the statement 6 is false.

3 0
3 years ago
How many grams are in 2.4 moles of NH4?
xxTIMURxx [149]

Answer: 43.2 grams

Explanation:

Given that,

Amount of moles of NH4 (n) = 2.4

Mass of NH4 in grams (m) = ?

For molar mass of NH4, use the molar masses of:

Nitrogen, N = 14g;

Hydrogen, H = 1g

NH4 = 14g + (1g x 4)

= 14g + 4g

= 18g/mol

Since, amount of moles = mass in grams / molar mass

2.4 mole = m / 18g/mol

m = 2.4 mole x 18g/mol

m = 43.2g

Thus, there are 43.2 grams in 2.4 moles of NH4.

8 0
3 years ago
Other questions:
  • Science question down below
    9·1 answer
  • The solubility product of PbI2 is 7.9x10^-9. What is the molar solubility of PbI2 in distilled water?
    5·1 answer
  • Which of the following is a disadvantage of using hydropower? (2 points)
    13·2 answers
  • 108/49 In ? 108/48 Cd + ? In the equation above, what particle or type of radiation needs to be included on the right hand side
    7·1 answer
  • 14. In groups, students create dioramas to depict different ecosystems and their physical characteristics. One of the dioramas i
    9·1 answer
  • Why do we not know yet if we live in multiverse
    7·1 answer
  • What kind of structure do carbon atoms form in an aromatic compound?
    11·1 answer
  • Good night India and good morning USA​
    12·2 answers
  • Number 14 please help.. chemistry
    6·1 answer
  • What type of cleaning agent should be used to clean a laminar flow hood?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!