2 points
Identify the basic law on the behavior of matter: States that mass is
neither created nor destroyed in a chemical reaction or physical changes.
Law of conservation of mass
Law of definite proportions
Law of multiple proportions
Identify the scientist that contributed to the atomic theory: He conducted 2 points
d the nucleus has a nositive charge.
Answer:
Law of conservation of mass
Ernest Rutherford
Explanation:
The basic law of behavior of matter that states that "mass is neither created nor destroyed in a chemical reaction or physical change".
This is the law of conservation of mass. It is very essential in understanding most chemical reaction. Also, in quantitative analysis, this law is pivotal.
Ernest Rutherford was the scientist that stated that the nucleus is made up of positive charge. It was not until James Chadwick in 1932 discovered the neutron that we had an understanding of this nuclear component.
Rutherford surmised from his experiment that because most the alpha particles passed through the thin Gold foil and just a tiny fraction was deflected back, the atom is made is made up of small nucleus that is positively charged.
explain
diffusion in solids
have a great day
Answer: Well,diffusion does not happen in solids because the particles are not free to move around and so they cannot inter-mix.
please help again I'm timed again
Answer:
melting evaporation
Explanation:
melting decreases because its melting out of form
Answer:the answer should be A E and F
Explanation:
They all use decreased energy
Why does the flow rate of a fluid with large particles increase?
NEED ANSWER ASAP!!!
Answer:
The viscosity of intestinal contents should define the mixing, diffusion and flow of nutrients and other materials in digesta (1–4). The viscosity of intestinal contents has been measured only after the removal of solid particles by centrifugation (5,6), under the assumption that particles or insoluble fibers in the diet do not affect the viscosity of gut contents (7). However, the complete removal of solid particles considerably reduced the coefficient of viscosity of pig cecal contents and changed the contents from a non-Newtonian to a Newtonian fluid in our recent study
how does the periodic table tell me if a element is solid, liquid, gas, or man made?
Answer:
if you search up the periodic table and go to any website it will let you press on the element and it will say if it is a gas,solid or liquid and it might say if it is man made!
Explanation:
i really hope this helps:)
What are some facts about light?
Answer:
A neon lamp was switched on during the Great Depression and continued to burn until it was discovered some 77 years later. The electricity bill came up to a whopping $17 000!
Explanation:
If an atom has an atomic number of 17 and a mass of 35, how many neutron does it have?
Will give brainliest
Answer:
18
Explanation:
(atomic number = protons) mass minus protons= neutrons.
What kind of reaction is this?
Answer:
Single replacement
Explanation:
Chemical equation:
2Al(NO₃)₃ + 3Ca → 3Ca(NO₃)₂ + 2Al
Single replacement:
It is the reaction in which one elements replace the other element in compound.
AB + C → AC + B
All other options are incorrect because,
Double replacement:
It is the reaction in which two compound exchange their ions and form new compounds.
AB + CD → AD +CB
Synthesis reaction:
It is the reaction in which two or more simple substance react to give one or more complex product.
Decomposition reaction:
It is the reaction in which one reactant is break down into two or more product.
AB → A + B
Combustion reaction:
Reaction in substance react with oxygen and form carbon dioxide and water.
PLEASE HURRY THIS IS TIMED!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
How many molecules are in 3.0 moles of Carbon Dioxide (CO)?
a 1.8 X 10
c. 2.0 X 1024
24
b. 2.4 x 1023
d. 2.6 X 1024
Answer:
if i remember correctly i beleive its A 1.8 x 10^24
but im not for sure also i think you forgot the 24
Explanation:
Which of the following statements about the elements in group 2 of the periodic table is true?
They all tend to become positive ions when they bond with other elements.
They all have similar chemical and physical properties.
They all have two electrons in their outermost shell.
They are all metals.
Answer:
they all have two electrons in their outermost shell
The elements of group 2 are alkaline earth metals that have two electrons in their outermost shell. So they have similar chemical and physical properties and tend to become positive ions in bond formation.
What are the properties of the elements of group 2?The elements present in group 2 include Beryllium, Magnesium, Calcium, Strontium, Barium, and Radium.
The elements of group 2 are similar in their physical and chemical properties as all the elements have the same number of valence electrons. All alkaline earth metals are silvery-white-colored solids under normal conditions. They are also shiny and quite reactive.
The general electronic configuration of group 2 elements is ns². The alkaline earth metals have fully filled s-orbital in their valence shells, they tend to lose two electrons to produce cations with +2 charge.
Therefore, the elements of group 2 are electropositive in nature. Therefore, all the given statements about group 2 of the periodic table are true.
Learn more about elements of group 2, here:
https://brainly.com/question/20455446
#SPJ2
Plants use sunlight as energy to convert carbon dioxide and water into glucose and oxygen. Which best describes
the reaction?
The law of conservation of mass indicates the same amount of carbon will be found in the reactants as in
the
products
The law of conservation of energy indicates the same amount of carbon will be found in the reactants as in the
products
The law of conservation of mass indicates the same amount of glucose will be found in the reactants as in the
products
The law of conservation of energy indicates the same amount of glucose will be found in the reactants as in the
products
Answer:
The law of conservation of mass indicates the same amount of carbon will be found in the reactants as in the products
Explanation:
The expression that best describes this reaction is that the same amount of carbon will be found in the reactants as in the products.
During the process of photosynthesis, carbon dioxide combines with water using solar energy to produce glucose and oxygen.
It can expressed as depicted below:
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
To validate our choice;
This is a balanced chemical equation:
6 moles of carbon is found on the reactant side and also, 6 mole of carbon on the product side.
But Glucose is not found on both sides of the expression
Answer:
answer 1
Explanation:
The law of conservation of energy establishes that the masses are not destroyed, they can only be transformed.
Therefore the mass of carbon in the reactants (CO2 and H2O) must be in the products (glucose and oxygen)
so the correct statement is the first
The law of conservation of mass indicates the same amount of carbon will be found in the reactants as in the products.
( I know this an old post but uhhh points)
Can someone please help me
Answer:
A
Explanation:
This is the answer because:
Rainfall highly helps the trees on the mountains grow. The location of a tree also matters a lot because it has to be in a spot where it can reach sunlight and lots of rain.
Therefore, the answer is A.
Hope this helps! :D
500 gramos de un mineral con una riqueza en cinc del 65 % se hacen reaccionar con una disolucion de acido sulfurico de riqueza 96 % en peso y densidad 1823 kg/m3 . Calcula:
Answer:
Ver explicación abajo
Explanation:
LA pregunta esta incompleta, pero logré conseguir un ejercicio muy parecido a este con datos similares, y la pregunta que falta como tal son estas:
"a) La cantidad de sal producida.
b) Moléculas de hidrógeno obtenidas a 25 ºC y 740 mm Hg.
c) El volumen de la disolución de ácido necesario para la reacción."
Asumiendo que estos son los datos faltantes, hay que ver como resolver por parte:
a) Cantidad de sal producida.
En este caso debemos plantear la reacción que se lleva a cabo. Es un mineral que tiene Zinc y reacciona con acido sulfurico, por tanto la reacción que se lleva a cabo en teoría es:
Zn + H₂SO₄ -----------> ZnSO₄ + H₂
Entonces, queremos saber la cantidad de ZnSO₄ que se formó.
Para eso, debemos calcular primero cuantos gramos de zinc hay originalmente en la muestra, que son los que reaccionaron para formar esta sal, y luego los moles para que por medio de estequiometría, calculemos los moles de la sal.
Para la masa de Zinc, sabemos que el mineral contiene 65% de zinc o 0,65 entonces:
mZn = 0,65 * 500 = 325 g
Calculamos los moles usando la masa molecular de Zinc que es 65,37 g/mol:
moles = 325 / 65,37 = 4.97 moles
Ahora bien, como la reacción de arriba está bien balanceada, podemos asuimr por estequiometría que la relación Zn / ZnSO₄ es 1:1, asi que los moles de Zn serán los mismos de la sal por tanto:
moles Zn = moles ZnSO₄ = 4,97 moles
Calculando la masa molecular de ZnSO₄:
MM ZnSO₄ = 65,37 + 32 + (16 * 4) = 161,37 g/mol
Finalmente la masa de la sal es:
m ZnSO₄ = 4,97 * 161,37
mZnSO₄ = 802,01 gb) Moléculas de hidrógeno obtenidas
PAra este caso, ya tenemos los moles de Zn, y por estequiometría, todas las especies presentes están en relación 1:1, así que los moles de hidrógeno son los mismos de zinc. No es necesario el dato de temperatura y presión acá pues ya tenemos los moles.
Para conocer el número de moléculas, necesitamos el número de abogadro que es 6.02x10²³ por lo tanto las moléculas de hidrógeno:
Moléculas de hidrógeno = 6,02x10²³ * 4,97
Moléculas de hidrógeno = 2.99x10²⁴ moléculas de H₂c) Volúmen de ácido empleado
Finalmente para el ácido, como ya conocemos los moles empleados, podemos calcular la masa del ácido usando su peso molecular:
MM H₂SO₄ = (2*1) + 32 + (4*16) = 98 g/mol
m H₂SO₄ = 4,97 * 98 = 487,06 g
Ahora que ya sabemos su masa, solo calculamos la masa realmente usada (pues su %p/p es 96%) y con la densidad calculamos el volumen:
d = m/v
v = m/d
m H₂SO₄ (puro) = 487,96 * 0,96 = 467,58 g
El volumen será:
V = 467,58 g / 1,823
V = 256,49 mLEspero que esto te sirva, o te ayude como impulso a tu ejercicio real.
Help please!
1. L
2. M
3. X
4. Z
Help me with this please don’t scam me
Answer:
A is the answer it is correct
Answer:
A
Explanation:
trust me
Is boiling point and melting point are physical properties? (Answer quicklyyyyy)
A physical property is a characteristic of matter that is not associated with a change in its chemical composition. Familiar examples of physical properties include density, color, hardness, melting and boiling points, and electrical conductivity.
Which is the soft stone??
Answer:
Various soft stones were employed, the most popular being lime- stone basalt.
Explanation:
when does a double replacement reaction occur
Answer:
u should call me justin bc I was just in your mom
Answer:
he periodic table or an activity series can help predict whether single-replacement reactions occur. A double-replacement reaction exchanges the cations (or the anions) of two ionic compounds. A precipitation reaction is a double-replacement reaction in which one
Explanation:
Need help with pt 3 of Density worksheet
formula p=m/V
Explanation:
0.79
6.35
1.79
To find the density you have to divide the mass by volume
hope it helps!
A mixture of hydrogen and oxygen gases has a total pressure of 5.50 atm. What is the partial pressure of the hydrogen if the P(O2) = 1250 mm Hg?
Answer:
P O 2 = 5.21 atm P C O 2 = 4.79 atm
Explanation:
Hope it helps!
is this true or false ?
Answer:
false
Explanation:
The atom model has changed over time because of the discovery of subatomic particles
Answer:
False. Atom models have changed in the past centuries.
Determine the number of atoms of 25 g iron(II) chloride
Answer:
3.56x10²³ atoms
Explanation:
To solve this question we need first to determine the moles of iron (II) chloride, FeCl₂, using its molar mass. Then, using Avogadro's number we can solve for the number of atoms:
Moles FeCl₂ - Molar mass: 126.751g/mol-
25g FeCl₂ * (1mol / 126.751g) = 0.1972 moles
Number of atoms:
1 mole of FeCl₂ are 6.022x10²³ molecules of FeCl₂, that means 0.1972moles are:
0.1972mol * (6.022x10²³ molecules / 1mol) = 1.188x10²³ molecules of FeCl₂
In 1 molecule of FeCl₂ there are 3 atoms (1 of Fe and 2 of Cl), in 1.188x10²³ molecules of FeCl₂ there are:
1.188x10²³ molecules of FeCl₂ * (3atoms / molecule) =
3.56x10²³ atomsWhich is not an indicator for a chemical change?
A. Dissolving sugar
B. Unexpected temperature change
C. Unexpected color change
D. Combustion
Answer:
A
Explanation:
Because it does not change entirely.
What makes a metal and a non metal most
reactive? Where in the PT will you find the most
reactive metal and the most reactive non metal.?
Answer:
Explanation:
The reactivity of elements in the periodic table is based on the number of electrons in there outermost shell. Elements (metals) that have few electrons in there outermost shell are highly reactive because it is easier to lose fewer number of electrons (in the outermost shell during a reaction) than to lose more electrons in the outermost shell - thus metals that have one electron in there outermost shell are most reactive and are more reactive than those that have two electrons in there outermost shell. Hence, metals in group 1 are the most reactive metals because they all have one electron in there outermost shell.
Non-metals that have fewer electrons to complete there octet configuration are highly reactive because it is easier to gain fewer number of electrons (in the outermost shell during a reaction) than to gain more number of electrons - thus nonmetals that have seven electrons in there outermost shell are more reactive than nonmetals that have six electrons in there outermost shell. Hence, nonmetals in group 17 are the most reactive nonmetals because they contain seven electrons and have just one electron left to complete there octet configuration.
Help please Where does your water come from? Your tap or a bottle is not a valid answer.
where the water is actually collected, where it comes from originally, and how it actually gets
delivered to our houses in Southern California
Answer:
-water is collected from nearby water holes and put in a water tower after it's clean
Answer:
Your water comes from rivers and streams.
Explanation:
The water is collected from rivers and stream and gets delivered from the storage tank to the pipes of our house
Explain an example of how energy is transferred from one form to another
Answer:
Energy can be converted from one form to another. Examples: Gasoline (chemical) is put into our cars, and with the help of electrical energy from a battery, provides mechanical (kinetic) energy. Similarly, purchased electricity goes into an electric bulb and is converted to visible light and heat energy.
Answer:
Energy is transferred from one this to another in multiple forms, but mostly kinetic.
Explanation:
*CHEMISTRY*
*WILL GIVE BRAINEST*
A 5-liter sample of gas initially at 50°C is observed to expand to 5.5 liters when the temperature is raised to 100°C. After further increase in temperature, the volume is 6 liters. What is the approximate temperature (within 50 degrees) of the final state of the gas?
O 50°C
O 100°C
O 150°C
O 200°C
Answer:
150
Explanation:
.5 liter increase every temperature 50°C.
5 liter= 50 C
5.5 liter= 100 C
6 liter= 150 C
magsulat sa iyong sailing lyrics na kanta the tune of meron leron sinta
Answer:
I am sailing
I am sailing
Home again
'Cross the sea
I am sailing
Stormy waters
To be near you
To be free
I am flying
I am flying
Like a bird
'Cross the sky
I am flying
Passing high clouds
To be with you
To be free
Can you hear me, can you hear me
Through the dark night, far away
I am dying, forever crying
To be with you, who can say
Can you hear me, can you hear me
Through the dark night far away
I am dying, forever crying
To be with you, who can say
We are sailing, we are sailing
Home again
'Cross the sea
We are sailing
Stormy waters
To be near you
To be free
Oh Lord, to be near you, to be free
Oh Lord, to be near you, to be free
Oh Lord, to be near you, to be free
Oh Lord
Explanation:
I hope this is the right one
Cu2+ br1- ionic formula
Answer:
yes
Explanation:
To launch a rocket, liquid oxygen and liquid hydrogen are combined inside the rocket engine to react explosively. How do you think scientists take into account the law of conservation of mass when they calculate the amount of fuel needed for a rocket launch?
Answer:
Explanation:
In this chemistry lab, students investigate how to build and launch a simple rocket that uses hydrogen and oxygen gases that will be mixed to propel the rocket (large bulb plastic pipette). Students will understand the principles of combustion reactions, kinetics, stoichiometry of reactions, activation energy, explosive mixtures, rocketry, and different types of chemical reactions. Students will explore and determine the proportions of hydrogen and oxygen mixture that will achieve the best launch results. Students will compare the balanced chemical reaction of hydrogen and oxygen with their lab results; students should discover that the optimal distance occurs when the mixture of hydrogen and oxygen is two to one hydrogen, oxygen mixture ratio and this can be determined theoretically from the balanced chemical reaction equation. Students will perform the lab, collect data, and discuss, compare, and contrast their lab findings with the balanced chemical reaction equation. Students will present their structured inquiry investigations using a power-point presentation. Other groups along with the teacher will assess each group by using a provided rubric. Group assessments will be the deciding assessment for the final lab score. A follow up activity could investigate how NASA scientists launch real rockets into space and propose a procedure to investigate and collect data on a launching a heavier object at the school football field.