Which of the following changes is observed when we move across the row from left to right in the periodic table?
Atomic radius increases
Atomic radius decreases
Number of protons decreases
Chemical reactivity of metals increases
For periods 2 and above, what is the maximum number of valence
electrons that an atom can have?
how many stars are there???
Answer:
one star
In our solar system, there is only one star that we know of – the sun! Our solar system is very unique in that is only has one star. Most other solar systems have at least two stars. These are called binary systems.
Explanation:
[tex]\huge\purple{Hi!}[/tex]
Some estimates peg the Milky Way's star mass as having 100 billion "solar masses," or 100 billion times the mass of the sun. Averaging out the types of stars within our galaxy, this would produce an answer of about 100 billion stars in the galaxy. This is subject to change, however, depending on how many stars are bigger and smaller than our own sun. Also, other estimates say the Milky Way could have 200 billion stars or more.
Lowest freezing point: N2, CO, or CO2
Answer:
N2
Explanation:
CO freezing point is -337 F
CO2 freezing point is -109 F
N2 freezing point is -346F
Step 8 measuring the volume of air near 80C ANSWERS
Temp of Gas : 82C
Height of Column of gas : 7.4
Temp of Gas : 355 K
Volume of gas : .93 cm3
Answer:
The answer is in the picture below.
Explanation:
Answer:
basically the question asked is the answer
its correct :)
Explanation:
EDGE 2023
Complete the sentence: Cellular respiration occurs ________________.
only in plant cells
only in animal cells
only in chlorophyll
in plant and animal cells
Answer:
in plant and animal cells
Answer:
In plant and animal cells
Explanation:
What does electronegativity have to do with polarity?
Answer:
Electronegativity is the measure of the ability of an atom to attract electrons to itself. So, higher electronegativity helps atoms take more control over shared electrons creating partial negative regions and partial positive regions which result in dipoles that cause polarity.
Explanation:
(pls mark me brainliest)
Answer:Electronegativity is the measure of the ability of an atom to attract electrons to itself. ... So, higher electronegativity helps atoms take more control over shared electrons creating partial negative regions and partial positive regions which result in dipoles that cause polarity.
Explanation:hope this helps and if im wrong im sorry :)
two liquids are combined and a gas is released is this a chemical change?
Answer:
yes it is a chemical change
Explanation:
because first it was in liquid and turned into gas
Answer:
It's a chemical reaction
which planets mass is nearly double that of mercury?
Answer:
earth I think like that because earth is the second planet
What is the half life if 500 grams decays to 125 grams in 25years?
with steps pls
Answer: The half life of the sample is 60.26 years.
Explanation:
All radioactive decay reactions follow first order reaction.
The formula used to calculate the rate constant for a first order reaction follows:
[tex]k=\frac{2.303}{t}\log \frac{a}{(a-x)}[/tex]
where,
k = rate constant = ?
t = time period = 25 years
a = initial concentration of the reactant = 500 g
a - x = concentration of reactant left after time 't' = (500 - 125) = 375 g
Putting values in above equation, we get:
[tex]k=\frac{2.303}{25yrs}\log \frac{500g}{375g}\\\\k=0.0115yr^{-1}[/tex]
Now, to calculate the half life period of the reaction, we use the equation:
[tex]t_{1/2}=\frac{0.693}{k}[/tex]
where,
[tex]t_{1/2}[/tex] = half life period of the reaction = ?
k = rate constant = [tex]0.0115yr^{-1}[/tex]
Putting values in above equation, we get:
[tex]t_{1/2}=\frac{0.693}{0.0115yr^{-1}}\\\\t_{1/2}=60.26yrs[/tex]
Hence, the half life of the sample is 60.26 years.
Bonus question which of these is the smallest??
Answer:
Explanation:
Atoms
Metals in general have:
a. High electrical conductivity
b. High thermal conductivity
c. High density
d. All of the above
Answer:
d. All of the above
Explanation:
In what order are redox reactions balanced?
Answer:
B
Explanation:
Answer:
b
Explanation:
a p e x :)
Match these items :))))))
How many significant figures does the number 125,000 have?
Answer:
3
Explanation:
1, 2, and 5.
Please mark me brainliest :D
Answer:
6
Explanation:
you count the zero because they are in the right side
What kind of information does this map show?
O A. The natural resources found in different areas
O B. The elevation of Earth's surface features
O C. The roads that connect different cities
O D. The shapes of different landforms
SURMA
What percent of a mammal’s genetic material comes from each gamete?
A.10%
B.100%
C.25%
D.50%
Answer:
D.
Explanation:
because gametes are sexual reproducing cells, like sperm and egg cells are gametes. and those make up 50% of you
To solve this we must be knowing each and every concept related to gamete. Therefore, 50% of a mammal’s genetic material comes from each gamete. The correct option is option D.
What is gamete?Sex cells are another frequent name for gametes. The fundamental name for them is "reproductive cells," and they are a component of human reproductive system.
These gametes are indeed the ones that aid in sexual reproduction and they are charge of creating the zygote, a whole new cell that is known as a zygote. These cells are haploid cells, in which each and every gamete typically carries a unique version of the chromosomes. 50% of a mammal’s genetic material comes from each gamete.
Therefore, 50% of a mammal’s genetic material comes from each gamete. The correct option is option D.
To know more about gamete, here:
https://brainly.com/question/2569962
#SPJ6
What mass of sodium contains the same number of atoms as 27 grams of Aluminum?
Answer:
1.35 grams of Aluminum. I think!!!! :|
Explanation:
laurenercsp6fpli I'm about done with your foolishness!!! NOW STOP!!!
Liquid in a graduated cylinder has a volume of 70 mL. You put a small solid ball into the cylinder, and the height of the liquid moves up to 80 mL. What is the volume of the ball?
What is the pressure in a 29.0-L cylinder filled with 45.5 g of oxygen gas at a temperature of 325 K ?
Answer:
P = 1.29 atm
Explanation:
Given data:
Volume of cylinder= 29.0 L
Mass of oxygen gas = 45.5 g
Temperature = 325 K
Pressure of gas = ?
Solution:
First of all we will calculate the number of moles of oxygen:
Number of moles = mass/molar mass
Number of moles = 45.5 g/ 32 g/mol
Number of moles = 1.4 mol
Pressure of oxygen:
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
P ×29.0 L = 1.4 mol × 0.0821 atm.L/ mol.K × 325 K
P = 37.36 atm. L / 29.0 L
P = 1.29 atm
The number of particles in one mole of a chemical substances is 602,200,000,000,000,000,000,000 particles. What is the correct way to write this number in scientific notation?
6022 x 10¹⁹
0.6022 x 10²⁴
60.22 x x10²²
6.022 x 10²³
The correct way to write this number in scientific notation : 6.022 x 10²³
Further explanationScientific Notation is a standard form of writing numbers used in mathematical operations
The rules:
1. Writing order : first digit, decimal point, next digit
2. Then followed by powers of 10 (the value can be +/-)
If the value is> 10 (the power of 10 is +), the decimal point is moved to the left, to the right of the first digit
If the value is <10 ((the power of 10 is -), the decimal point is moved to the right, to the right of the first digit
I certainly didn't count the details of the number of zeros listed, but only saw the answer choices.
And the right ones are: 6.022 x 10²³
Answer:
The answer is D! 100%!
Explanation:
999 Juice Wrld Told Me So, and the internet never lies.
Elements in this family have 1 valence electron?
Answer:
Elements in group I have one valency electron.
Sometimes a fossil is formed as a result of the movement of an organism in soft sediment. What type of fossil is this called? bone fossil trace fossil frozen fossil petrified fossil
Answer:
The most common method of fossilization is called permineralization, or petrification.
Answer:
Trace Fossil
Explanation:
typically formed when an organism moves over the surface of soft sediment and leaves an impression of its movement behind.
what is the definition of weight in science
Answer: The weight is the force acting on the object due to gravity. Some standard textbooks define weight as a vector quantity, the gravitational force acting on the object.
What is the name of a zinc and phosphorus mixture
The chemical isoamyl acetate C7H14O2 gives the odor of pears. What is the percent oxygen in isoamyl acetate?
Answer:
[tex]\% O=24.6\%[/tex]
Explanation:
Hello!
In this case, since the by-mass percent of an element in a compound is computed by taking into account its atomic mass, the number of atoms in the molecules and the molar mass of the compound, we can write:
[tex]\% O=\frac{2*16.00}{130.18 } *100\%\\\\\% O=24.6\%[/tex]
Best regards!
Which chemical(s) are reactants in the following chemical
equation?
C + O2 CO2
SELECT ALL THAT APPLY
а) C
b) 02
c) CO2
d ) There are no reactants in this chemical equation.
Answer:
A and B
Explanation:
The reactants in this chemical equation are C and O₂.
Given the chemical reaction is:
C + O₂ → CO₂
In a chemical reaction, reactants combines to give the product. The reactants are located to the left side of the expression.
The products are found on the right side .
A + B → C
reactants products
So, in the given reaction,
C and O₂ are the reactants and CO₂ is the product.
Answer: B and C
Explanation:
ur welcome
One of the main functions of the musculoskeletal system is to allow _______ of the body.
A.
reproduction
B.
movement
C.
growth
D.
maintenance
Answer:
B,Movement
Explanation:
Your musculoskeletal system includes bones, muscles, tendons, ligaments and soft tissues. They work together to support your body's weight and help you move. Injuries, disease and aging can cause pain, stiffness and other problems with movement and function.
Answer:
movement
Explanation:
you need your muscles for movement <3
With what noble gas is the cation in KNO2 isoelectronic?
Answer:
argon
For example, the K+ ion is isoelectronic with argon. Potassium has 19 electrons and 1 is in the outermost shell: a valence electron. If potassium is ionized and becomes a +1 cation, this is to say that it lost its single valence electron. This is favorable, because it gives potassium a noble gas configuration
1. Which of the following components does not make up rock salt? *
Answer:
In my opinion the third one is write.
Explanation:
soil.