Answer: Precipitate is a sign that a chemical reaction has occurred.
What mass of CO2 would you need so that you had 2.5 moles of it?
A:44g
B: 88g
C. 110g
D: 132g
How many moles of magnesium is 6.02 x 1022 atoms of magnesium?
Answer: 0.0500
Explanation:
How many moles are in 3.24 x 1020 particles of lead? (show work plz)
0.000538 mol Pb
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
3.24 × 10²⁰ particles Pb (lead)
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 3.24 \cdot 10^{20} \ particles \ Pb(\frac{1 \ mol \ Pb}{6.022 \cdot 10^{23} \ particles \ Pb})[/tex]Multiply/Divide: [tex]\displaystyle 0.000538 \ mol \ Pb[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
Our final answer is in 3 sig figs, no need to round.
30 POINTS PLEASE HELP (IF YOU GIVE WRONG ANSWER ILL REPORT U ) What type of galaxy is described as revolving around a single point and has spinning arms of stars which extend from the center? (3 points)
spiral
elliptical
irregular
barred spiral
Answer:
The type of galaxy that is described as revolving around a single point and has spinning arms of stars which extend from the center is;
Spiral
Explanation:
A spiral galaxy which is the most common type of galaxy is a class of Hubble sequence of galaxies which was described in the 1936 work The Realm of the Nebulae by Edwin Hubble
Spiral galaxies are therefore have a flat disk shape such that the stars, the dusts, and the gas that make up the galaxy cluster in several radially spreading spiral arms that come together in the galaxy center
Answer:
Spiral
Explanation:
What is the process where plants make seeds that grow into new plants
Answer:
Plant fertilization
Explanation:
Hope this helps:) Have a great day
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I NEED HELP ASAP PLS
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brainliest;) ^
Explanation:
20g of Na and 10g of Cl2 which is in excess?
The equation of the reaction is given as;
2 Na + Cl2 --> 2 NaCl
From the equation;
2 mol of Na reacts with 1 mol of Cl2
Converting the masses of reactants given to mol
Number of moles = Mass / Molar mass
Na;
Number of moles = 20 / 23 = 0.8696 mol
Cl2;
Number of moles = 10 / 71 = 0.1408 mol
In the chemical equation, the ratio was 2: 1 however with the masses, we can tell that Na is in by far excess.
0.8696 mol of Na would require 0.4348 of Cl2 (Present = 0.1408 mol)
This means;
Na - Excess Reactant
Cl2 - Limiting Reactant
Second part; How much NaCl would be produced?
The limiting reactant determines how much of the product is formed.
From the equation of the reactant;
1 mol of Cl2 produces 2 mol of NaCl
0.1408 mol of Cl2 would require x mol of NaCl
1 = 2
0.1408 = x
x = 0.2816 mol of NaCl
Converting to mass;
Mass = Molar Mass * Number of moles
Mass = 58.44 g/mol * 0.2816 mol
Mass = 16.46 g
Remember! All ___________________________ are __________________________
but not all Atoms are elements.
Answer:
all element are atom but all at all atom are element
Explanation:
because all atoms of an element are same whereas atom of different element are different
Which of these human development stages occurs after childhood?
1. infancy
2. adulthood
3. maturation
4. adolescence
Answer:
4 Adolescence
Explanation:
Adolescence is the human development stages occurs after childhood. Hence option 4 is correct.
What is human development?Human development is defined as expanding people's freedoms and opportunities while also enhancing their well-being. The true freedom that everyday individuals have to choose who they are, what they do, and how to live is what human growth is all about. This discipline tries to comprehend the numerous transformations that people and their relationships go through as they learn and develop.
The youngster reaches puberty during the adolescent stage. A abrupt rise in hormones causes a variety of emotional and mental changes throughout this time. The body's major and secondary sex traits develop during a significant growth spurt phase.
Thus, adolescence is the human development stages occurs after childhood. Hence option 4 is correct.
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Any kind of help would be nice :)
Answer:
1st page, number a-ENergy is added or absorbed
I cant see the answers on the 2nd page
Explanation:
Answer:
1. A gas is released.
2. Energy is absorbed.
3. Color change.
4. Energy is given off.
5. Change in odor.
Explanation:
The specific heat capacity of silver is 0.24 J/g °C. How many joules of energy are needed
to warm 0.500 g of silver from 25.0°C to 27.5°C?
Answer:
0.3 J
Explanation:
The equation for heat capacity is Q = mcΔT where Q is the heat, m is the mass of the substance, c is the specific heat capacity of the substance and delta T is the change in temperature. Plugging those values into the equation, we have Q = (.500)(0.24)(27.5-25) = 0.3
An aluminum ion has 13 protons, 14 neutrons, and 10 electrons. What is the charge of the aluminum ion?
Answer:
+3
Explanation:
-10 + 13 = +3
-10 IS THE NUMBER OF ELECTRONS
13 IS THE NUMBER OF PROTONS
As the aluminum ion is having 10 electrons and 13 protons, means it will be having +3 charge.
What are protons?A proton is a stable subatomic particle with the symbol p, H+, or 1H+ and an elementary charge of +1e.
It has a slightly lower mass than a neutron and has 1836 times the mass of an electron due to the proton-to-electron mass ratio.
Protons and neutrons are made up of two types of quarks: up quarks and down quarks.
Each up quark carries a +2/3 charge. Each down quark has a -1/3 charge. The electrical charge of a nuclear particle is determined by the sum of the charges of the quarks that comprise it.
Because the aluminum ion has 10 electrons and 13 protons, it will have a +3 charge.
Thus, the charge of aluminum atom is +3.
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PLEASE PLEASE HELP ITS PAST DUE AND IM CLUELESS ILL GIVE BRAINLIEST TO THE FIRST CORRECT ANSWER
Which of the following would be the evidence of a physical change?
a. change in state of matter
b. precipitate was formed
c. unexpected change in odor
d. formation of bubbles
Answer:
[tex]\boxed {\boxed {\sf A. \ Change \ in \ state \ of \ matter}}[/tex]
Explanation:
A physical change occurs when only the physical properties change. They are generally reversible and no new substances are formed.
However, in a chemical change, the chemical structures and properties change, plus new substances are formed.
Let's analyze each answer choice.
1. Change in state of matter
The state of matter is a physical property, so this is a physical change.
2. Precipitate was formed
A precipitate is a solid formed in a liquid solution. This is a new substance and a chemical change.
3. Unexpected change in odor.
A change in odor is a sign of chemical change.
4. Formation of bubbles
Bubbles signify the formation of gas or a new substance.
So, the best answer choice is A. change in state of matter
Question:
Which of the following would be the evidence of a physical change?
a. change in state of matter
b. precipitate was formed
c. unexpected change in odor
d. formation of bubbles
Answer:
A. Change in state of matter!
Explanation:
How to know it evidence of physical change!
EXPECTED color change.Change in SIZE or SHAPE.Change in state of matter.Reversible.No NEW substance formed!HELP ME! IM SO DESPERATE I WILL GIVE YOU BRANLIEST!!!!!!!!!!!!!!!!
Write the complimentary DNA strand for the given strand of DNA
CGTAAGCGCTAATTA
Answer:
The answer is GCATTCGCGATTAAT
Explanation:
"Chargaff's rule, also known as the complementary base pairing rule, states that DNA base pairs are always adenine with thymine (A-T) and cytosine with guanine (C-G). A purine always pairs with a pyrimidine and vice versa. However, A doesn't pair with C, despite that being a purine and a pyrimidine."
If this is not the answer, try the translation with the 5-3 Strategy and if not still then try using U instead of T.
In the northern hemisphere, free moving objects traveling over large distances are deflected to the ____________ Of their intended path of motion
Answer:
the answer is right
Explanation:
hope this helps
or whatever cameron said, give cam brainliest
have a good day:)
If a solutions is made
by adding 32 grams of
sugar to 50 Kg of
water, what would be
the percent by mass?
Answer: The mass percent is 0.064%
Explanation:
To calculate the mass percent of solute in a given solution, we use the formula:
Mass of sugar (solute) = 32 g
Mass of solvent = 50 kg = 50000 g ( 1kg=1000g)
Putting values in above equation, we get:
[tex]\text {mass percent}=\frac{32}{32+50000}\times 100=0.064\%[/tex]
Hence, the mass percent is 0.064%
Which of these make up the mass of an atom?
Answer:
Protons, neutrons and electrons, and what makes up the mass of those, well for protons and neutrons quarks, and for electrons, there are indivisible, that is nothing makes them up, they are fundamental particles, you can find them on the standard model of particle physics
Explanation:
How many atoms are in 10 moles of chlorine?
O
A. 6.022 x 1023
O
B. 6.022 x 1024
O
C. 1.024 x 1023
D. 1.024 x 1024
Answer:
I Found the answer is A
Explanation:
I use a calculator
What is the speed of a jet that flies 3200 miles in 20 hours?
160 mph
3180 mph
3220 mph
64000 mph
Answer:160
Explanation:3200/20=160
Answer:
about 160 mph
Explanation:
The diagram below shows two organelles—a chloroplast and a mitochondrion.
How are these organelles similar?
A.
They are both found in animal cells.
B.
They are both designed to create food for the cell.
C.
They both have an inner membrane and an outer membrane.
D.
all of these
Answer:
I think the answer is C because it's TRUE they both do
Explanation:
Sorry I had to do some thinking on that one lol but yeah the first person who answered I think is right
What are land plants used for?
Answer:
Land plants are also known as Embryophytes. Embryophytes are complex multicellular eukaryotes with specialized reproductive organs. The name derives from their innovative characteristic of nurturing the young embryo sporophyte during the early stages of its multicellular development within the tissues of the parent gametophyte.
Explanation:
Answer:
there used for mountains , wait I'm just trynna get points ya feel me
Explanation:
What is the name of Br6F10 ?
Answer:
Bromine fluoride
You are designing a new product that requires the use of a stable, nonreactive
gas. Which gas would be most suitable?
A. Oxygen, o
B. Fluorine, F
C. Helium, He
D. Hydrogen, H
The gas which would be most suitable for the product is Helium.
What is a gas?A gas is the third state of matter in which there is little intermolecular bonding between the molecules of the substance. Gases usually occupy their container and usually have low boiling point
Gas most suitableSince Oxygen, Fluorine and Hydrogen are group 6, 7 and 1 respectively. These three gases are reactive and would only be stable when they achieve their stable octet configuration. Whereas, Helium which is a noble gas already has a stable duet configuration and is thus non-reactive.So, the gas which would be most suitable for the product is Helium.
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Answer:
what we have to do ? pls paste the whole question .
Explanation:
Ionic and polar compounds usually dissolve in what kind of solvents
Answer: They usually dissolve in Polar Solvents
Explanation:
Answer: Ionic/ Polar solvents.
Explanation:
• Ionic or polar compounds will dissolve in ionic or polar solvents.
• Water is a universal solvent because it can dissolve both ionic and polar covalent compounds.
HELPPPPO I NEED HELP AND THIS IS DUEE !!
Answer: The second one. 26 m/sec
Explanation: i hope this helps! have a great day :)
. If a second polarizer is set up that is horizontal, what, do you suppose, happens with the
vertical component or the light, in general?
what form of matter has a definite shape and takes up space?
Answer:
If something is in a solid state of matter, it has a definite shape and volume. The volume of an object is the amount of space it occupies. A block of wood placed on a table retains its shape and volume, therefore, it is an example of a solid. If a liquid is poured on that same table, there are very different results
Explanation:
Hello
Answer:
The reliable and correct answer to this question is Solid
Explanation: If something is in a solid state of matter, it has a definite shape and volume. The volume of an object is the amount of space it occupies. A block of wood placed on a table retains its shape and volume, therefore, it is an example of a solid.
a. Identify the type of reaction shown:
Li + CaCl2 ---> LiCl + Ca
Answer:
single-replacement reactions
Explanation:
A single-replacement reaction is defined as a chemical reaction in which one strong element replace the other weak element.
The given chemical equation Li + CaCl2 ---> LiCl + Ca is an example of single-replacement reactions in which Lithium (Li) is stronger than Calcium (Ca) and replaces calcium to form bond with Chloride.
Hence, the correct answer is "single-replacement reactions".
what is the atomic number of an atom?
Answer:
The atomic number of an atom is the number of protons in the nucleus or the number of electrons in a neutral atom
Explanation:
Which of the following is a valid mole ratio from the balanced equation 2C3H6 + 902 - 6CO2 + 6H20? (4 points)
O 1 mol CHE
2 mol CO2
O 6 mol H,
9 mol O2
O 2 mol CHE
6 mol O2
O 3 mol H2O
2 mol CO2
Answer:
6 mol H, 9 mol O2
Explanation:
We can see that in water, there are 6 moles of hydrogen, and for oxygen, there is 9 moles