Answer:
Group 2A (or IIA) of the periodic table are the alkaline earth metals: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). They are harder and less reactive than the alkali metals of Group 1A.
Explanation:
Given the reaction: 2 H2 + O2 => O2 = 2 H2O.
What is the total mass of water formed when 497.80 g of oxygen reacts with hydrogen?
Using the empirical formula, calculate the formula weight of the compound. Use the periodic table to help you.
Type the correct answer in the box. Round your answer to three decimal places.
Answer:
The formula weight of the compound is
46.069 g/mol.
Explanation:
Determine the molar mass from the empirical formula (C2H6O) by multiplying the molar mass of each element in the compound by the number of atoms of it and adding the resulting masses of the elements:
molar mass of C2H6O = (2 × 12.011 g/mol) + (6 × 1.008 g/mol) + (1 × 15.999 g/mol) = 46.069 g/mol.
An example of a change of state is __________. *
liquid filling a glass
paper burning
ice cubes melting
Answer:
ice cube melting
Explanation:
bcoz it's a chemical change
Imagine that you have 100g of water.
You start dissolving KNO3 in the water and you find that after you've dissolved about 55 g of KNO3, you can't dissolve any more; it just sinks to the bottom.
Approximately what is the temperature of the water?
Round your answer to the nearest whole number and submit the number only; no units.
Answer:
Explanation:
So, just find 55 on the solubility side and with your finger just move to the right untill you touch the line you should get in between 46-48. I would go more for 48.
Hope you have a wonderful day!
A medallion was dropped into 20.0 mL of water. The water level rose to 25.3 mL. What is the volume of the medallion? (Vobj = Vf - Vi)
Answer:
5.3 mL
Explanation:
We solve this problem using Archimede's principle, which states that the volume displaced by a submerged object is equal to the volume of the object.
With that in mind we calculate the volume of water displaced by the medallion:
25.3 mL - 20.0 mL = 5.3 mLAs the medallion displaced 5.3 mL of water when submerged, the volume of the medallion is also 5.3 mL.
Calculate the pH if the pOH = 7.4
Round your answer to two decimal places.
i need points
Explanation:
NUCLEAR REACTIONS
complete the nuclear reaction...
125
125
53
53
y HeeHn
ODRAG
The correct option for the following reaction is [tex]\gamma[/tex].
In the given reaction we can easily see that the reaction is already complete as a nuclear equation. There is no need for the product to balance the equation as it is not a chemical reaction where reactants and products interact to form new substances.
In this question we can see that a radioactive isotope of iodine-125 ( [tex]^{125}_{53} I[/tex] ) is decaying to produce another isotope of iodine-125 ( [tex]^{125}_{53}I[/tex] ) this process is called beta decay.
As no new element is required to balance the reaction we can say that the answer to this is [tex]\gamma[/tex] as it doesn't add up anything to the reaction.
Learn more about Beta decay at:
https://brainly.com/question/22624428
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What is the number of moles of 60.7 liters of oxygen molecules?
Answer:
2.17 moles of gas.
Explanation:
A sample of xenon gas occupying 10.0 mL is collected in a laboratory at 27°C and 1.25 atm. What is the volume of the gas at standard conditions?
What number should replace the question mark to show the number of C6H1206 (glucose) molecules in a balanced
chemical equation?
10
10
40
32
O
O
20
10
10
O
20
20
305
2 read the thermometer and fill in the temperature in Celsius and feharient
Answer:
10-10 above the 0 is positive and the ones below is - (negitive)
Explanation:
Write about an object's motion in your own words.
Answer:
An objects motion is called kinetic energy. Which is energy that is cause by movement or motion
Explanation:
Answer:
An object at rest has zero velocity - and (in the absence of an unbalanced force) will remain with a zero velocity. Such an object will not change its state of motion (i.e., velocity) unless acted upon by an unbalanced force. An object in motion with a velocity of 2 m/s, East will (in the absence of an unbalanced force) remain in motion with a velocity of 2 m/s, East. Such an object will not change its state of motion (i.e., velocity) unless acted upon by an unbalanced force. Objects resist changes in their velocity
Explanation:
an object that is not changing its velocity is said to have an acceleration of 0 m/s/s. Thus, we could provide an alternative means of defining inertia
what are the group of magnesium and nitrogen ? write the balanced chemical equation for the reaction between two element . what type of chemical reaction is it .
Explanation:
Magnesium - Group 2
Nitrogen - Group 5
The balanced equation for the reaction is given as;
3Mg + N₂ --> Mg₃N₂
Type of reaction;
Synthesis / Direct Combination
Salinity is another word for
Question 3 options:
saltiness
density
temperature
depth
Answer:
Saltiness
Explanation:
There is no step-by-step. It h us is what it is.
All of the following are forms of water in the atmosphere EXCEPT _________.
Group of answer choices
A. ozone
B. precipitation
C. ice
D. vapor
Answer:
OZONE
Explanation:
HOPE IT HELP
MARK ME AS BRAINLIEST
How many grams of H2 will react with 350 g of N2?
Answer:
10.80
Explanation:
As per the equation, let us calculate the mole ratio. N2+3H2→2NH3. As per the equation one mole of nitrogen reacts with 1 mol of hydrogen.
In terms of mass. 28.01 g of nitrogen needs 3 mol of hydrogen or 6.048 g of hydrogen.
We can set up the ratio;
28.01 g of
l
N
2
needs
6.048 g of
l
H
2
1 g of
l
N
2
needs
6.048
28.01
g of
l
H
2
50.0 g of
l
N
2
needs
6.048
×
50.0
28.01
l
g of
l
H
2
=
10.80 g of
l
H
2
(M1)(M2)+(M2)(P2)=(12.000000)(.9890)+(13.003354)(.1100)=amu
Answer:
The answer would most likely be 4.0004
Explanation:
PLEASE HELP!!!What are the factors of climate change
Answer:
According to The genic variations in atmospheric compositions and proper use of land or the other factors the cahs climate change
help me on question
pleaseeeeeee
What did scientists believe about caloric? State two examples of the scientific phenomena that the caloric theory explained
Answer:
that it was difficult, bc they didnt accept the particle model of matter, air molecule get warmer and explains charles law (i think)
3. Find the molar mass of the following compounds:
a. Ammonia NH3
b. Iron (II) Nitrate Fe(NO3)2
Answer: a.4
Explanation:
n=1
h=3
pls answer if you do ty so much
Answer:
c
Explanation:
A popsicle melts on a table. Select ALL statements that are true. A The particles gained thermal energy and changed from a solid to a liquid B The particles lost thermal energy and changed from a solid to a liquid C A physical change occurred D A new chemical substance was made when it melted
Answer:
its "a" nd "C" Big Dawg if im wrong im sorry dawg been a min since i took a test like dis
Explanation:
Can somebody help me plz
Answer:r=1.2 d=2.4
Explanation:
Radius is half the diameter and the diameter is 2.4 m
Answer:
Divide the 2.4 by 3.14
Explanation:
An aluminum (Al) boat anchor has a mass of 6800 grams. How many
moles of aluminum are in the boat anchor?
Looking at the Periodic Table, how can you determine if an element is a metal, metalloid or nonmetal?
Answer:
It depends on where it's located on the periodic table.
Explanation:
Metals are on left side of the periodic table except Hydrogen (H), which is a nonmetal, then there's the staircase, which has the metalloids, and on the right of the staircase are the nonmetals.
Calculate the number of moles of nitrogen dioxide, that contain 4.0*1023 nitrogen dioxide molecule.
0.66 mol NO₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
4.0 × 10²³ molecules NO₂ (Nitrogen dioxide)
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 4.0 \cdot 10^{23} \ molecules \ NO_2(\frac{1 \ mol \ NO_2}{6.022 \cdot 10^{23} \ molecules \ NO_2})[/tex]Multiply/Divide: [tex]\displaystyle 0.664321 \ mol \ NO_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
0.664321 mol NO₂ ≈ 0.66 mol NO₂
Most of earths fresh water is in glaciers
True or false
PEASE HELPP
Answer:
True
Explanation:
PLS HELPP
1. Take two water molecules and bring them close together. The hydrogen of one water molecule is attracted to what part of the other water molecule?
_____________________________________________________________
2. This attraction between parts of two different polar molecules is called __________ bonding.
_________________________________________________________________
3. Which type of bond holds the oxygen and hydrogen atoms together within a water molecule?
____________________________________________
4. Pull the hydrogen off of the oxygen in a single water molecule. Which bond is stronger, a hydrogen bond or a covalent bond?
_____________________________________________
Answer:
The slight positive charges on the hydrogen atoms in a water molecule attract the slight negative charges on the oxygen atoms of other water molecules. This tiny force of attraction is called a hydrogen bond. This bond is very weak.
Explanation:
:)
Help ASAP I will mark brainliest to he correct answer
Answer:
513.3 km/h
Explanation: