Answer:
118
Explanation:
what is change in science??
Answer:
A transition from one accepted theory to another or from one employed method to another.
Explanation:
examine the graph to determine half life of strontium -90
What did Thomson contribute to atomic theory?
A. The discovery that positive charge is concentrated in a core, or nucleus
B. The discovery that negative charge is concentrated in a core, or nucleus
C. The discovery of negatively charged particles, now called electrons
D. The idea that electrons have quantized amounts of energy
I need help.
It measures 10 cm x 5 cm x 2 cm and has mass of 1,930g. What is the density of the gold bar?
How many total atoms are in this formula?
2MgSO4
Calculate the volume of a clear liquid that has a mass of 20 g and a density of 15.77 g/mL.
Answer:
20 g g/mL. 15.77
Explanation:
i think i answer it
What will be the volume of a typical inhaled human breath of 0.020 mol at 1.0 atm and 37°C?
O A. 0.061 L
OB. 0.51 L
O C. 5.1 L
D. 520 L
Answer:
0.51
Explanation:
i got it wrong multiple times just for this to be the answer.
listening to mitski while crying over this science goodluck
Which of the following is a physical change?
Dissolving salt in water
Digesting food
Burning wood
Oxidation
Which of the following is found in both a cell and a virus?
A) hereditary(genetic) material B) cell membrane C) nucleus D) mitochondria
Answer:
I believe that it is a
Explanation:
I can't comment on you the other question for some reason. Do you have any other means of communication??
How do you determine how many molecules are in a chemical equation
Answer:
Determine the mass of substance and it's molar mass. Divide the given mass by it's molar mass to get moles and multiply time
6.002*1023 molecules 1mole
100.0 grams of an isotope with a half-life of 36.0 hours is present at time zero. How much time will have elapsed when 25.00 grams remains?
We have that the time that will have elapsed when 25.00 grams remains is
T=72hours
From the question we are told
100.0 grams of an isotope with a half-life of 36.0 hours is present at time zero. How much time will have elapsed when 25.00 grams remains?
Generally the equation for the Half life is mathematically given as
Where
[tex]X=\frac{25}{100}\\\\X=0.25\\\\Therefore\\\\\frac{1}{2}^n=0.25\\\\n=2 half lives[/tex]
Therefore
T=2*36
T=72 hours
Hence
the time that will have elapsed when 25.00 grams remains is
T=72hours
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A dump truck, a sports car, and a bicycle are traveling at the same velocity. Which is true?
A The bicycle has the least kinetic energy.
B More information is needed to compare their kinetic energy.
C They all have the same kinetic energy.
D The sports car has the most kinetic energy.
Answer:
a
Explanation:
The object with greater mass is having greater kinetic energy. Here, all the objects has the same velocity therefore, the bicycle is having least kinetic energy.
What is kinetic energy?Kinetic energy is a form of energy generated by virtue of the motion of the object. The kinetic energy is related to the mass and velocity of the body by the expression below:
KE = 1/2 mv².
As per this equation, kinetic energy increases with an increase in mass or/ and velocity. The substance with greater mass is possessing the greater kinetic energy.
A dump truck has greater mass than a car and bicycle. Thus, at the same velocity for all, the greater kinetic energy is for the truck and the least kinetic energy is for the bicycle having the least mass here. Thus, option A is true.
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PLEASE ANWSER CORRECTLY!! I WILL MARK BRAINIEST!! LOOK AT PICURE!!
a major cause of rancidity of lipids in foods is exposure to
Answer:
exposure to the sun (heat and light) for long period of time and air (oxygen reacts with particles)
Based on Periodic Law, how is the Periodic Table arranged?
Answer:
Elements of the periodic table are arranged in order of increasing atomic number. the periodic law states "when elements are arranged in increasing atomic number, there is a periodic repetition of their chemical and physical properties."
Explanation:
a car is parked along a level road identify the forces that act upon the car
Answer: Gravity i think
In what ways are the electronic structures of the group 14 (4A) elements similar? In what ways are they different?
Elements in the same group have the same number of outermost electrons.
What is electronic structure?Electronic structure refers to the arrangement of electrons in the atom. We know that elements in the same group have the same number of outermost electrons.
However, as we come down the group, the inner shells of the elements in group 14 become bigger and the outermost shells are now found at higher energy levels such as n=4 or 5.
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Which of the following areas would most likely see the largest amount of heat
flowing up towards the surface of Earth?
a. any area that just experienced an earthquake
b. an area of active volcanoes
c. all areas around the equator
d. heat never flows to the surface of the earth
Answer:
c. because all countries around the equator experiences heat
ENT
Which of the following is one of Mendel's laws?
Law of Independent Assortment
ouTube
Law of DNA contains genes
Law of Segregation of Genes
Answer:
law of independent assortment
Which statement best describes a chemical change?
O A. A substance changes size or phase.
O B. Atoms are made and destroyed.
O C. The nuclei of atoms are rearranged.
O D. Substances form new substances.
What is a unique quality of the halogens/halides?
Answer:
Halogens are highly reactive
All matter is made up of atoms and molecules that are what?
Determine the number of atoms in the following chemical formulas.
1. Naci
Answer:
2 atoms
Explanation:
sulphur (iv)oxide reacts with hydrochloric acid solution .give reasons
Answer:
Hydrogen chloride - diluted solution. Sulfur dioxide ( SO 2) reacts with chlorine gas (Cl 2) in the presence of moisture to give HCl and H 2 SO 4. ... H 2 SO 4 and HCl are strong acids in aqueous solutions. If more HCl is added to the solution, then carbon dioxide gas, sodium chloride and water are produced.
How many significant figures in 100000 g?
Answer:
1
Explanation:
Any digit that is not 0 is always significant
If the net force acting on a stationary object is zero, how will the object’s motion be affected?
Answer:
remain at rest
Explanation:
Bromine, a liquid at room temperature, has a boiling point of 58°C and a melting point of -7.2°C. Bromine can be
classified as a
Answer:
Selenium
adadadadad
Explanation:
if u ask which group
so it is halogen
or u ask which type of matter
then liquid
Are two atoms of same element identical
Answer:
No. Two atoms of the same chemical element are typically not identical. Since the states of the electrons in an atom are what determine the nature of the chemical bonding that the atom experiences, two atoms of the same element can react differently if they are in different states.
Answer: No
Explanation: Two atoms of the same chemical element are typically not identical. First of all, there is a range of possible states that the electrons of an atom can occupy. Two atoms of the same element can be different if their electrons are in different states.
based on the activity series, which metal dissolves in hydrochloric acid to produce hydrogen gas, but does not react with steam or liquid water?
Answer: Iron
Explanation: does not react with water, but hydrochloric acid will dissolve them, displacing the hydrogen from the HCl. Iron reacts with hydrogen chloride to produce iron chloride, FeCl2 — sometimes known as ferrous chloride.
To solve such this we must know the concept of chemical reaction. Iron is the metal, which dissolves in hydrochloric acid to produce hydrogen gas, but does not react with steam.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
When metals react with acid the liberation of hydrogen gas take place. Metal which is at top of reactivity series react with both acid and steam or liquid water. Iron is the only metals which dissolves in hydrochloric acid to produce hydrogen gas, but does not react with steam or liquid water.
Therefore, iron is the metal, which dissolves in hydrochloric acid to produce hydrogen gas, but does not react with steam.
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How many cm of a solution of 0.100 mol dm NaOH are required to completely -3 neutralize 25.0 cm of 0.250 mol dm H3PO4?. a) Write a balanced equation for the reaction (4 marks) b) How many moles of H3PO4 need to be neutralized? (1 marks) c) How many moles of NaOH are needed to neutralize the H3PO4? (1 marks) d) How many cm of 0.100 mol dm NaOH contain the moles in question 5(©) above? (1 marks)
Answer:
Explanation:
How many cm of a solution of 0.100 mol dm NaOH are required to completely neutralize 25.0 cm of 0.250 mol dm H3PO4?.
a) Write a balanced equation for the reaction NaOH to neutralize (4 marks
?. ) 25.0 cm of 0.250 mol dm H3PO4
H3PO4 + 3NaOH----------> Na3PO4 +3 H2O
b) How many moles of H3PO4 need to be neutralized? (1 marks)
25.0 cm3 of 0.250 mol dm3 H3PO4: 1 liter has 0.25 moles. 100 ml has 0.025 moles 25 ml has o.025/4 molea or 0.00625 moles)
c How many moles of NaOH are needed to neutralize the H3PO4? (1 marks)
for every moles of H3PO4, WE NEED 3 MOLES OF NaOH. FOR 0.00625 MOLES WE NEED 3X 0.00625 =0.01875 MOLES OF NaOH
d) How many cm3 of 0.100 mol /l NaOH contain the moles in question 5(©) above? (1 marks)
1 L CONTAINS 0.100 Moles
100 ml contains 0.010Moles
we need 187.5 ml since (187.5 X 0.100)/1000=0.01875