help !!! pretty please ❤️

Answer:

See below!

Explanation:

To find the symbol of the element, you have to use the periodic table.  

The mass number is the number of protons and neutrons in the atom.  

The atomic number is the number of protons in the atom.

You can find the number of protons from the periodic table.

You can find the neutrons by subtracting the mass number by the number of protons in the atom.

Unless you have an ion, you will have the same amount of electrons as you do protons.

To write in nuclear notation, you write the chemical symbol with the mass number and atomic number shown in the attachment.  It is preferable to have the mass number and atomic number directly above each other.

Which pH values indicate an acid soil?

Which gases in the following list exist as separate atoms: hydrogen, helium, nitrogen, oxygen, neon.

Select one:
a. Hydrogen and helium
b. Helium and nitrogen
c. Helium and neon
d. Oxygen and nitrogen

If today is Monday and it is a 1st Quarter moon, what phase will it
be on Thursday?

To investigate the effect of salt water on a cell, a researcher places one cell sample in freshwater and a second cell sample in salt water. After six hours, the researcher observes and sketches the two cells as shown. What change in the cells occurred during the six hours the cells remained undisturbed? A.Osmosis occurred in the salt water cell sample because the water from inside the cell moved out of the cell to a lower concentration, causing the cell to shrink. B.Osmosis occurred in the freshwater cell sample because the water from outside the cell moved into the cell to a higher concentration, causing the cell to grow. C.Osmosis occurred in the salt water cell sample because the salt from outside the cell moved into the cell to a lower concentration, causing the cell to shrink. D.Osmosis occurred in the freshwater cell sample because the salt from inside the cell moved out of the cell to a higher concentration, causing the cell to grow.

True or false, the torch that is carried to the Olympic cauldron to be lit, is ignited by a match

identify NaOH (aq) + HNO3(aq) → NaNO3(aq) + H2O(1)

A velocity-time graph shows how what changes over time?

Sulfuric acid is an important chemical in industrial production of many products. In the “old” days, it was called oil of vitriol. It is commonly dyed brown now to alert people to its hazards because it is hugely corrosive. It is commonly found in car batteries. What is the molarity of 25.9 moles of sulfuric acid dissolved in 4.00 L of solution?

What is the volume of 3.5 moles of chlorine gas at standard temperature and pressure (STP)? (3 points)
6.4 L
22 L
32L
78 L

Compare the seasons on Titan to the seasons on Earth.

Brainliest to right answer

What are bacteria? Chapter 7 lesson 2 AYU

Single-celled organisms need a microscope to be seen...
O True
O False

an atom is the smallest unit of an element that retains the ___ of that element

Why the bond in water molecule os polar covalent bond, while than in chlorine molecule is pure covalent bond? Give reason? ​

Summarize how a dinosaur can become a fossil.

To which of the three main chemical classes does Mercury (Hg) belong?
a) It's not an element in the periodic table
b) Metalloids
c) Non-metals
d) Metals

Difference between Solute and solvet​

Suppose astronomers are interested in obtaining an image of a large
area in the sky. Which radiation should astronomers observe if they
want to get images 24 hours a day, quickly and cheaply? Why?

Why can more sugar be dissolved in hot water than cold water (more solute be dissolved in hot solvent then cold solvent)

Name the type of light interaction feeling hotter in a black shirt than a white shirt
1. Reflected
2. Absorbed
3. Transmittied ​

7. A strong acid has a pH of
A) 0
B) 6
C) 7
D) 14

If more reactants are used in a chemical reaction, more products will be
produced. This is because *
1 point
More reactants have more atoms to react to form more products
More reactants take up the same volume
Too many products can slow down the reaction
More reactants cause the reaction to heat up

100 grams of liquid iron is put in liquid water when is equilibrium reached

If Mars’s atmosphere were 100% oxygen, would that make it like Earth’s?
Yes; Earth’s atmosphere is mostly oxygen.
Yes; the amount of oxygen in Earth’s atmosphere changes.
No; Earth’s atmosphere is mostly nitrogen.
No; Earth’s atmosphere is all carbon dioxide.

How do you figure out the final temperature or the initial temperature in calorimetry.

What is an equilibrium constant?

A. A constant relating the effects of activation energy and temperature on the reaction rate

B. The value of the rate of the forward and reverse reactions at equilibrium

C. The amount of energy required for the collision of two molecules to result in a reaction

D. The ratio of equilibrium concentrations of products to concentrations of reactants​

Help! Please:(
Given the following chemical equation, how many grams of water are created when 50.0 grams of oxygen react with excess hydrogen ?
2H2 + O2 - -> 2H20

(Help would be greatly appreciated, chemistry is not my strong suit) How many moles of NaCl are present in a solution with a molarity of 8.59M and 125mL of a solution?
1. 1.07g
2. 62.7mol
3. 1.07mol
4. 62.7g

How do human change the Earth's surface?

Human activities such as overpopulation can change the Earth's surface.
Human activities such as driving cars can change the Earth's surface.
Human activities such as mining and deforestation can change the Earth's surface.
Human activities such as poaching can change the Earth's surface.