Answer:
Krypton
Explanation:
Answer:
C
Explanation:
trust me :)
Which equation represents a chemical reaction
Answer:
A balanced chemical equation represents a chemical reaction that obeys the Law of Conservation of Mass (Matter). It can be thought of as describing how many atoms or molecules of reactants are consumed in order to produce a certain number of atoms or molecules of products.
Fermium-253 has a half-life of 0.334 seconds. How long will it take, in seconds, for a 96 atom sample to decay to 3 atoms?
The half life time period of decaying 96 atom sample to 3 atoms of Fermium-253 if it has a half-life of 0.334 seconds is 1.67 s.
What is half life time period?Half life time period is defined as the time interval which is required to decay the substance into half of its concentration. It is denoted by t(1/2).
As, atom decay in first half life time = 48 atoms.
Atom decay in second half life time = 24 atoms.
Atom decay in third half life time = 12 atoms.
Atom decay in fourth half life time = 6 atoms.
Atom decay in fifth half life time = 3 atoms.
So, we can see that in 5 half life time 96 atoms decay into 3 atoms.
So, time interval require to decay 96 atoms into 3 atoms is 5 × 0.334 = 1.67 s.
Thus, we concluded that the half life time period of decaying 96 atom sample to 3 atoms of Fermium-253 if it has a half-life of 0.334 seconds is 1.67 s.
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Why can’t we reach “absolute zero”?
Which unit represents speed?
Joules
kilometers per second
miles per hour
newtons
(Pick ONE)
Answer:
1
Explanation:
Answer:
can be SI or also know miles per second.
Copy and Complete these sentences to describe how particles are arranged in solids, liquids, and gases.
In solids, the particles are arranged ____________________
In liquids, the particles are arranged ____________________
In gases, the particles are arranged ____________________
Answer:
soilds - close together arranged in a regular way
liquids - close together arranged in a random way
gases - far apart arranged in a random way
Explanation:
✞➪name the macromolecules that are chosen as drug targets.♔♔♔
Answer:
The macromolecules chosen as drug targets are carbohydrates, lipids, proteins, and nucleic acids.
Explanation:
Hope this helps you. Have a nice day. Please mark as the brainliest. It helps a lot. ^_^
¿Qué son las fuerzas intramoleculares?
Respuesta:
Las fuerzas intermoleculares que actúan entre las moléculas se clasifican en : Dipolos permanentes. Dipolos inducidos. Dipolos dispersos.
Explicación:
Dentro de una molécula, los átomos están unidos mediante fuerzas intramoleculares (enlaces iónicos, metálicos o covalentes, principalmente). Estas son las fuerzas que se deben vencer para que se produzca un cambio químico. Son estas fuerzas, por tanto, las que determinan las propiedades químicas de las sustancias.
Sin embargo existen otras fuerzas intermoleculares que actúan sobre distintas moléculas o iones y que hacen que éstos se atraigan o se repelan. Estas fuerzas son las que determinan las propiedades físicas de las sustancias como, por ejemplo, el estado de agregación, el punto de fusión y de ebullición, la solubilidad, la tensión superficial, la densidad, etc.
1 someone help me please
Answer:
J
Explanation:
Because the vapor can be turned back to water and the vapor is still considered water.
What element does “X” represent in Figure 1?
Helium
Krypton
Neon
Argon
Answer:
Argon
Explanation:
It's atomic number is 18
hope that's it
1.-Una solución de 1600 ml contiene 9,5 gramos de agua oxigenada H2O2 Calcular el porcentaje peso volumen del soluto.
What does the arrow in chemical equations mean? (PLEASE HELP)
A- Cancels
B- Subtracts
C- Prevents
D- Yields
Answer:
yields
Explanation:
I just did that quiz on k12 8th grade
Answer:
D
Explanation:
TOOK TEST ON K12
how many atoms of hydrogen are present in a molecule of methane, CH 4
Answer: One methane molecule, CH4, contains one carbon atom and four hydrogen atoms.
Explanation:
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Question 9
Element Q is a theoretical nonmetal with atomic number 57. Consider the isotope: Q-110. How
many electrons are in an atom of Q-110 if the atom has a charge of -2?
Answer:
This isotope has 59 electrons giving it a charge of -2.
Explanation:
To find this we have to understand isotope relates to the mass of the nucleus. This isotope has 59 electrons to counter the protons and give it a negative charge.
In an atom, the atomic number is equal to number of electrons , hence element Q has 57 electrons on addition 2 electrons that is -2 charge the number of electrons is 59 electrons.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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A solid is heated to its melting point and the resulting liquid is heated. Choose the graph below that shows these temperature changes.
Please answer please
Answer:
1k km
Explanation:
An unknown compound has the following chemical formula: NO_x
where x stands for a whole number.
Measurements also show that a certain sample of the unknown compound contains of oxygen and of nitrogen.
Write the complete chemical formula for the unknown compound.
Answer:
NO_x
Explanation:
you said it
how do you determine the total number of Valence electrons that are used to make a particular lewis structure for a compound or an ion?
Answer:
The number of valence electrons of an element can be determined by the periodic table group (vertical column) in which the element is categorized.
Explanation:
Hope it helps!
Let us assume that Cr(OH)3 (s) is completely insoluble, which signifies that the precipitation reaction with NaOH(aq) (presented in the transition) would go to completion Cr3+ (aq) + 3NaOH(aq) + Cu(OH)3 (s) + 3Na+ (aq) If you had a 0.150 L solution containing 0.0280 M of Cr3' (aq), and you wished to add enough 1.31 M NaOH(aq) to precipitate all of the metal, what is the minimum amount of the NaOH(aq) solution you would need to add? Assume that the NaOH(aq) solution is the only source of OH(aq) for the precipitation Express the volume to three significant figures and include the appropriate units.
Answer:
Formation of an insoluble compound will sometimes occur when a solution containing a particular cation (a positively charged ion) is mixed with another solution containing a particular anion (a negatively charged ion). The solid that separates is called a precipitate.
Explanation:
Which location in the diagram above is the Northern Hemisphere experiencing winter?
Location A
Location B
Location C
Location D
Answer:
location b
Explanation:
Answer:
Location D
Explanation:
is true answer
A rectangular block weighs 121g. The dimensions of the block are 9.1cm by 5.4cm by 2.3cm. From this data, what us the density of the block in g/mL? Will tge block float or sink in water and how do you know? Show all your work on a piece of paper.
The density of the rectangular block is 1.07 g/mL.
From the question, we have the mass of the rectangular block as 121g
The dimensions of the block are given as follows;9.1cm by 5.4cm by 2.3cm
So we have the volume of the block as; 9.1cm × 5.4cm × 2.3cm = 113 cm^3
Let us recall that; 1 cm^3 = 1 mL, so 113 cm^3 = 113 mL
Having said that, we must also remember that;
Density = Mass/volume
Density = 121g/113 mL
Density = 1.07 g/mL
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How do you define note-taking and how do you take notes to help you understand the material?
Answer:
Note-taking is simply jotting down the steps to solve specific problems, or listing the resources that can help you when learning something new. In order to take effective notes that can help you understand the material, you can use techniques like Cornell Notes which help you to organize your writing in a way that makes it referable when stuck doing independent work.
If you have a density of 3 g/mL and a volume of 10 mL, what is the mass?
Answer:
30 gram
Explanation:
Hope this helps
Brainliest pls ❤️
Sodium chlorate decomposes into sodium chloride and oxygen gas as seen in the equation below.
2NaClO3 --> 2NaCl +3O2
How many moles of NaCl were produced by 10 moles of NaClO3? Round your answer to the nearest whole number.
Answer:
10 moles of sodium chloride
Explanation:
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The table shows the densities of Earth's layers.
Which of these is most likely the density of Earth's mantle?
1.5-2.2 g/cm3
3.4-5.6 g/cm3
10.6-12.4 g/cm3
13.5-15.2 g/cm3
Answer:3.4 - 5.6
Explanation:
TRUE OR FALSE:The basic atom has a neutral charge.
true because I already foresighted a whole lot of things that I was not able to
Answer:
True
Explanation:
When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral.
;D
Write the equation for the alpha decay of C-11.
Write the equation for the beta decay of Be-10
HELP HELP HELP
Answer:
We know that in the decay process the sum of molecular number as well as molecular weight should be constant.
The following three reaction are as follows
1 .
Explanation:
Help please!! I thought it was 374.8 but it keeps saying to check my significant digits
Answer:
ok
Explanation:
i am doing now so
1. Your parents go through McDonalds drive-thru and get you a Big Mac and Coke. You
take the lid off your Coke because it is too full and you need to sip some of the Coke so
it won't spill. After doing so, you forget to put the lid on. Then, a car pulls out in front of
you and your mom yells, "Look out!" You hold your cup still so it won't spill. However,
the coke still spills out. Describe which of Newton's laws you can contribute this to and
why. (textbook pg. 334)
Answer:
because theres a force called gravity
Explanation:
Which properties cause chemical reactions?
chemical properties
chemical and physical properties
physical properties
neither chemical nor physical properties
Answer:
Chemical Properties
Explanation:
Answer: chemical properties
Explanation: chemical bonds between atoms are formed or broken.
Given R = 0.0821L⋅atm/mol⋅k, what is the volume of mole of gas at a pressure of 3.12 atm and a temperature of 270K?
A. 69.2 L/mol
B. 86.5 L/mol
C. 22.2 L/mol
D. 7.10 L/mol
Answer:
The answer is d
Explanation:
Answer:
The answer is D
Explanation: