A chemical reaction is shown.

SnO2 + H2 → Sn + H2O

What is true about this chemical reaction?

A.
It is balanced because the mass of the reactants (number of atoms) is equal to the mass of the products (number of atoms).

B.
It is unbalanced because the mass of the reactants (number of atoms) is greater than the mass of the products (number of atoms).

C.
It is unbalanced because the mass of the reactants (number of atoms) is less than the mass of the products (number of atoms).

D.
It is balanced because the number of reactants (number of atoms) is equal to the number of products (number of atoms).

Read the information about an experiment.


Jadon plans on carrying out an experiment involving the burning of steel wool to illustrate the conservation of mass. Steel wool is made of iron. When it is burned it combines with oxygen to form iron(III) oxide.

Which step in his experiment is the most important if he wants his experiment to correctly demonstrate the conservation of mass?

A.
The steel wool should be burned inside of a sealed jar or other closed system.

B.
The steel wool should be burned over a long period of time (at least two hours).

C.
The steel wool should be burned in a room that is at room temperature (20–25°C).

D.
The steel wool should be burned in its entirety sExpected Outcomes – Metals in Hydrochloric Acid

Metal Observations
Copper No reaction even when gently heated
Iron Little initial reaction.
More vigorous reaction when heated.
Positive test for hydrogen gas.
Solution turned from colorless to yellow.
Magnesium Vigorous initial reaction; rapid evolution of gas.
Positive test for hydrogen gas.
All of the magnesium seemed to disappear.
Solution remained colorless.
Zinc Initial reaction produced rapid evolution of gas; less vigorous than magnesium.
All of the zinc seemed to disappear.
Solution remained colorless.


Students in Ms. Brown's Science Lab demonstrated several chemical reactions, by placing the each above chemicals in HCl (hydrochloric acid). Unfortunately, the data did not appear to support the Law of Conservation of Matter in any of the experiments. The recorded Mass of the Reactants did not match the Mass of the Products. Based on the expected outcomes listed in the table above, what might be a reason that their demonstrations were not successful?
A.
They only used metals

B.
They perfomed the experiment in a closed system

C.
The experiment was not performed in a closed system

D.
They didn't use enough HCl that no iron is left in its original state.

Answer:

1) A chemical reaction is shown.

SnO2 + H2 → Sn + H2O

What is true about this chemical reaction?

B.

It is unbalanced because the mass of the reactants (number of atoms) is greater than the mass of the products (number of atoms).

2) Read the information about an experiment.  

Jadon plans on carrying out an experiment involving the burning of steel wool to illustrate the conservation of mass. Steel wool is made of iron. When it is burned it combines with oxygen to form iron(III) oxide.

Which step in his experiment is the most important if he wants his experiment to correctly demonstrate the conservation of mass?

A.

The steel wool should be burned inside of a sealed jar or other closed system.

Explanation:

The explanation to number 1 is that I selected it in my test and got it.

The explanation the number 2 is from the link below:

https://quizizz.com/admin/quiz/5dee60258f1145001bc02ed5/physical-science-2nd-9-weeks-practice-test-2020

The true statement about the given chemical reaction is-It is balanced because the mass of the reactants (number of atoms) is equal to the mass of the products (number of atoms). Therefore, the correct options for all the problems are 1-A, 2-A and 3-D.

A balanced equation refers to an equation where the number of atoms of each element is the same on both sides of the equation. The given equation is balanced because the number of Sn atoms and the number of H atoms on the reactant side are equal to the number of Sn atoms and the number of H atoms on the product side.

1. The steel wool should be burned inside a sealed jar or other closed system is the most important step if he wants his experiment to correctly demonstrate the conservation of mass.

2. They didn't use enough HCl that no iron is left in its original state might be a reason that their demonstrations were not successful.

Therefore, the correct options are 1-A, 2-A and 3-D.

Learn more about balanced equation, here:

https://brainly.com/question/29764227

#SPJ3

The concept of induced fit refers to the fact that a. Substrate binding may induce a conformational change in the enzyme, which them brings catalytic groups into proper orientation. b. When enzymes bind substrates, the substrates are bought into proximity to make a chemical reaction favorable. c. When a substrate binds to an enzyme, the enzyme induces a loss of water from the substrate. d. When a substrate binds to an enzyme, free energy is released due to non-covalent interactions.

Sedimentary rocks such as sandstone often contain cracks or ripples. These marks show that a number of sedimentary rocks form

A. In pockets of molten rock.

B. Inside ice in mountain ranges

C. Under sands in the desert

D. At the bottom of bodies of water

Which type of law is used to discipline members of the armed services?

The maximum number of individuals that a population
can support and sustain is known as ?
A Carrying capacity
B Limiting Factor
C Migration
D Density

When you flex your knee, where are the fulcrum and the load? Where is the muscle that provides the effort located?

Prior to Mendel, scientists thought that an offspring _____.


inherited traits from only one parent

blended the traits of both parents

demonstrated traits randomly

exhibited certain traits from each parent

Why don't you have mechanical energy
when
you are
laying on the ground?

The diagram below shows a ciliated cell from the lining of the airway.

Which of the following states its function?Required to answer. Single choice.
(1 Point)


A)it is the place where diffusion of gases take place

B)it moves mucus and sweeps dust from lungs

C)it secretes trypsin

Pls tell meeee quickkk

What is one characteristic that a star’s spectrum can reveal?
A.
its direction
B.
its temperature
C.
when it was formed
D.
its constellation

through which plant structure does water move by capillary action?

The kidneys and sweat glands both work to prevent excesses of
a) either uric acid or urine in the body.
b)either water or salt in the body.
c)either carbon dioxide or oxygen in the body.
d) either feces or pH levels in the body.

The image here shows potential outcomes for chromosomes at a particular stage of meiosis. Which questions appropriately assess what is happening in the image. Select ALL that apply.
A) How does crossing over increase the outcome of meiosis?
B) How does fertilization increase genetic diversity in a diploid organism?
C) How does independent assortment increase genetic diversity during meiosis?
D) How many potential combinations result from chromosomes alignment during metaphase I?
E) How does chromosome methylation result in silencing specific genes during gamete formation?

Wrong answers only!! What are 3 sustainable tourism takes into account

Why do mutations code proteins?

practice: density calculations

Dave is perched on a tree branch. Which factor determines his potential energy?

PLS ANSWER QUICK! I WILL GIVE POINTS, ITS JUST A YES OR NO QUESTION!


In two or more complete sentences, describe a scenario where human activities are related to an increase or decrease in biodiversity in an ecosystem.

I WAS THINKING OF WRITING ABOUT THE DEFORESTATION IN THE AMAZON, HOW THAT CAN KILL THE ANIMALS. OBV IF THE ANIMALS ARE DEAD THAT CAUSES A DECREASE IN BIODIVERSITY. IS THIS RIGHT?

An igneous rock has a coarse texture and is dark in color. How else can this rock be accurately described?

small crystals
cooled quickly
produced from magma
formed at Earth’s surface

PLEASE HELP ITS MY LAST QUESTION
Oxygen is a product of the electron transport chain.
True or False

I NEED HELP ASAP PLEASE!!

A person with a bacterial infection begins to feel hot and feverish. This response MOST likely helps the body fight infection by —

Earth’s rotation caused surface currents in the Northern Hemisphere to

A. Curve Clockwise

B. Move in straight lines

C. Curve Counterclockwise

D. Move in diagonal lines

The amount of energy at each trophic level in an ecosystem decreases as it moves through the ecosystem. Typically, only about 10 percent of the energy at one trophic level is transferred to the next level. The remaining energy is lost through metabolic processes as heat.

Suppose that, in the ecosystem modeled above, 150,000 kcal (kilocalories) of energy are contained within green plants. Assuming that the amount of energy transferred from one trophic level to the next is exactly 10 percent, determine the following amounts of energy in the ecosystem.

what does it mean to say that CO2 becomes "fixed" during photosynthesis

In order to assign a Richter magnitude to an earthquake event, a scientist would have to measure the _________ waves on a seismogram.
a. secondary
b. surface
c. primary

How does gene regulation relate to organism complexity?

True or False: There are no shortcuts in
dichotomous keys!

How do trees help reduce carbon dioxide in the atmosphere?

Some argue that solar power should be the main energy source for the United States. Which argument could be used against this idea? A. It contributes to global warming. B. It can only be produced in sunny areas. C. It is a nonrenewable resource. D. It releases greenhouse gases.

At what light intensity do both sun plants and shade plants have the same rate of
photosynthesis?