Answer:
If you hace 4 moles of CaCl₂, you can make 8 moles of HCl.
Explanation:
The balanced equation is
CaCl₂ + 2 H₂O → Ca(OH)₂ + 2 HCl
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction) , the following amounts of each compound participate in the reaction:
CaCl₂: 1 mole H₂O: 2 molesCa(OH)₂: 1 mole HCl: 2 molesThen you can apply the following rule of three: if by stoichiometry 1 mole of CaCl₂ forms 2 moles of HCl, 4 moles of CaCl₂ form how many moles of HCl?
[tex]moles of HCl=\frac{4 moles of CaCl_{2}*2 moles of HCl }{1mole of CaCl_{2}}[/tex]
moles of HCl= 8
If you hace 4 moles of CaCl₂, you can make 8 moles of HCl.
Pretend your friend was absent from class today...
Write what you would say if you had to explain how and why elements to
your friend.
Answer:
how and why elements what?? why they exist?? im gonna assume that's what you meant, so elements exist because we're all on earth and without elements, we don't have resources to live. the earth is made of elements and if there were none, we wouldn't even have a planet
Explanation:
^
Should American drugmakers have to limit acetaminophen pills sold over-the-counter?
Answer: The agency requires all prescription drugs containing acetaminophen to carry a black box warning that an overdose can result in liver transplant or death. For over-the-counter Tylenol and its generic equivalents, the FDA requires no warning that overdose can be fatal.
Explanation:
^^^^
How are the electron structures of carbon (C) and oxygen (O) similar? PLEASE HELP
Answer:
Carbon and oxygen are similar in a few ways. They are both elements, which are the fundamental building blocks of all matter. This means that they both have protons and electrons. They also both have neutrons
True or False?
A day is about 12 hours long
Answer:
false it's 24 hours long.
Which characteristics do stable ecosystems tend to have
Answer:
Ecosystems contain biotic or living, parts, as well as abiotic factors, or nonliving parts. Biotic factors include plants, animals, and other organisms. Abiotic factors include rocks, temperature, and humidity. Every factor in an ecosystem depends on every other factor, either directly or indirectly.
¿Qué estudia la química orgánica?
Answer: el estudio de la síntesis, estructura, reactividad y propiedades del diverso grupo de compuestos químicos construidos principalmente de carbono
Explanation:Hope I helped:)
Which best describes the purpose of a fever?
Answer:
when you have a fever your body is trying to fight off a virus or some other kind of bad Bacteria
Explanation:
I think this because everyone has at least had a fever when they were sick and when you are sick you are likely to have a fever because your body is fighting off a bad bacteria
NEED HELP ASAP 20 POINTS !!!!!What does a subscript in a chemical formula tell you? For example the 3 in Rb3PO4 the number of atoms of the element symbol it follows the number of atoms of the element symbol it is in front of the number of molecules
Answer:
The answer should be A
Explanation:
because the definition of a subscript is that they indicate the number of atoms of an element present in am molecule or formula unit.
Answer:
The first choice. The rule is go left. Those subscript numbers always talk about the element to the left of them.
Explanation:
The straight forward answer is the first one.
You should always answer that when reading the chemical make up of molecules. Let's look at some examples.
C8 H18
Consider the 8. It must be describing how many carbons there are. If it was meant for the hydrogen, then what does the 18 mean? You wouldn't know.
Now look at something a lot more complicated.
Mg3(PO4)2
Use the going left rule. That satisfies Mg doesn't it? There are 3 of them and 3 is correct.
The two at the end is also straightforward if you think about it. It must be telling you how many molecules are in the brackets. If that were not so, then you wouldn't be able to tell what it did. So there are 2 PO4
But you still have the 4 to deal with. Use the going left rule again. 4 must be telling you how many oxygens you have inside the brackets. There are 4 of them.
When particles lose heat, what else is true?
Answer:
Answer: When the particles lose heat they move slower and have decreased kinetic energy.
how do some plants grow and survive in the harshest environments like the dessert or under water
Answer:
Adaptation
Explanation:
Some plants grow and survive in the harshest environments like the desert or underwater by adapting to the environment. For example, some plants in the desert have thick, waxy skin to reduce loss of water and to reflect heat. They also have large, fleshy stems to store water. Also, specific plants like cacti in the desert have spikes to protect them from animals wishing to use stored water. These adaptations help them to grow and survive in the desert.
In the ocean, plants have adapted to absorb all the water and carbon dioxide they need from the water they live in. Just as cacti have adapted to live in brutally hot deserts, ocean plants have adapted to deal with things like ocean tides and the salinity (or salt levels) of the water around them. Many ocean plants cling tightly to rocks in order to avoid being swept away by ocean tides.
Hope this helps! Can I have brainliest?
How does heart failure affect the lungs?
o Carbon dioxide enters the lungs.
Too much oxygen enters the lungs.
Blood leaves the lungs.
o Fluid can build up in the lungs.
Answer:
Pulmonary oedema can be caused by lung disease, but when heart failure is more serious, the pressure of blood in the lungs builds-up, pushing fluid into the air sacs. This is how heart failure can lead to respiratory failure. People with pulmonary oedema will feel breathless, weak and unwell.
Pls help on test (no old answers OR files)
During a combustion reaction, 9.00 grams of oxygen reacted with 3.00 grams of CH4.
What is the amount of the leftover reactant?
0.74 grams of methane
0.89 grams of methane
1.22 grams of oxygen
1.45 grams of oxygen
Which two processes of the water cycle absorb energy from the Sun?
A evaporation and precipitation B sublimation and evaporation C condensation and transpiration D precipitation and condensation
Answer: of Earth's atmosphere occurs as energy, primarily from the sun, causes liquid water to transform to another phase. As this occurs, liquid water absorbs energy, causing it to evaporate and form water vapor. The process of evaporation absorbs tremendous amounts of incoming solar energy.
Explanation:
20. Which of the following is the correct name for N205?
O nitrate oxide
O dinitrogen pentoxide
O nitrous oxide
O nitrogen dioxide
Answer:
B!
Explanation:
Di stnds for 2 (N2)
pent = 5 (05)
Iron(II) sulfide has a molar mass of 87.91 g/mol. 50 grams of
this substance would contain about 3.011 x 1023 molecules.
TRUE
FALSE
Answer:
true
Explanation:
Answer:
[tex]\boxed {\boxed {\sf False}}[/tex]
Explanation:
We want to know if 50 grams of iron (II) sulfide contains 3.011 * 10²³ molecules. Let's calculated and check.
1. Convert Grams to MolesWe know there are 50 grams of iron (II) sulfide or FeS If we want to convert from grams to moles, we use the molar mass (mass per 1 mole). This is given to us and it is 87.91 grams per mole for this substance. Let's create a ratio.
[tex]\frac {87.91 \ g \ FeS}{ 1 \ mol \ FeS}[/tex]
We want to convert 50 grams of FeS to moles, so we multiply by this value.
[tex]50 \ g \ FeS *\frac {87.91 \ g \ FeS}{ 1 \ mol \ FeS}[/tex]
Flip the ratio so the grams of FeS cancel.
[tex]50 \ g \ FeS *\frac {1 \ mol \ FeS}{ 87.91 \ g \ FeS}[/tex]
[tex]50*\frac {1 \ mol \ FeS}{ 87.91}[/tex]
[tex]\frac {50}{ 87.91} \ mol \ FeS[/tex]
[tex]0.5687635081 \ mol \ FeS[/tex]
2. Convert Moles to Molecules1 mole of any substance contains the same number of particles (atoms, molecules, formula units, etc.). This is Avogadro's Number or 6.022 *10²³. In this case, the particles are molecules of FeS. Create another ratio.
[tex]\frac {6.022 *10^{23} \ molecules \ FeS}{ 1 \ mol \ FeS}[/tex]
We want to convert 0.5687635081 moles of FeS to molecules, so we multiply by this value.
[tex]0.5687635081 \ mol \ FeS*\frac {6.022 *10^{23} \ molecules \ FeS}{ 1 \ mol \ FeS}[/tex]
The units of moles of FeS cancel.
[tex]0.5687635081 *\frac {6.022 *10^{23} \ molecules \ FeS}{ 1 }[/tex]
[tex]0.5687635081 *{6.022 *10^{23} \ molecules \ FeS}[/tex]
[tex]3.42509385*10^{23} \ molecules \ FeS[/tex]
If we round to the thousandth place, the 0 in the tenth thousandth place tells us to leave the 5.
[tex]3.425*10^{23} \ molecules \ FeS[/tex]
50 grams of iron (II) sulfide is approximately 3.425 * 10²³ molecules, not 3.011 *10²³ so the statement is false.
How many moles of O₂ are needed to react completely with 35.0 mol of FeCl₃?
4FeCl3+3O2->2Fe2O3+3Cl2
The 2 for the second half of the equation is not a coefficient it’s supposed to be for 2Fe2 Not 2O3.
26.3 mol
46.7 mol
23.3 mol
10.0 mol
Answer:
26.3 mol O₂
Explanation:
Step 1: Write the balanced equation
4 FeCl₃ + 3 O₂ ⇒ 2 Fe₂O₃ + 6 Cl₂
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of FeCl₃ to O₂ is 4:3.
Step 3: Calculate how many moles of O₂ are needed to react completely with 35.0 mol of FeCl₃
We will use the previously established molar ratio.
35.0 mol FeCl₃ × 3 mol O₂/4 mol FeCl₃ = 26.3 mol O₂
_Ch7H16+_O2=_CO2+_H2O balancing the equation
Answer:
0,11,7,8
Explanation: hope this helps!
Answer the following questions using the chemical equation below:
6CO2 + 6H2O => C6H12O6 + 6O2
3. How many total atoms are on the product side?
4. How many molecules of water are on the reactant side?
Why are infants and children often more susceptible to the effects of toxic substances than adult? (Explain)
From what I know personally from learning about this type of subject in the past is that children are more susceptible to the effects of toxic substances more than adults are, certain scientific data specifically indicate that children actually are for all intents and purposes more basically susceptible to toxic exposure than adults because they for the most part have proportionally definitely more intake of food contaminants, basically active developmental processes, basically multiple exposure pathways and really susceptible kind of socio-behavioral activities in a particularly major way.
How many units long is the circumference of a circle with diameter of 18 units?
Answer:
56.52 units
Explanation:
hope that helps :)
Select all of the HOMOGENEOUS mixtures from this list (click all that apply).
A. Paint
B. Chili
C. Blood
D. Soil
E. Salt water
Answer:
E is answer
Explanation:
salt water is the answer
Answer:
E.Salt water
Explanation:
Salt water is a homogeneous because the dissolved salt is evenly distributed throughout the entire salt water sample. The amount of salt in the salt water can vary from one sample to another.
More efficient plumbing reduces water pollution by _______. a. using more water b. using less water c. using cleaner water d. using dirty water Please select the best answer from the choices provided
Answer:
b. using less water
Explanation:
Pollution can be defined as the physical degradation or contamination of the environment through an emission of harmful, poisonous and toxic chemical substances.
In the United States of America, the agency which was established by US Congress and saddled with the responsibility of overseeing all aspects of pollution, environmental clean up, pesticide use, contamination, and hazardous waste spills is the Environmental Protection Agency (EPA). Also, EPA research solutions, policy development, and enforcement of regulations through the resource Conservation and Recovery Act.
In homes and offices, an effective and efficient design of pipes and other water-related facilities would go a long way to reduce water pollution because the water used are well managed and properly disposed into sinkholes.
Hence, more efficient plumbing reduces water pollution by using less water
Answer:
B
Explanation:
Which of these elements will successfully create a 1:1 bond with Carbon (C)
Carbon (C)
Silicon (Si)
Beryllium (Be)
Oxygen (0)
Answer:
Option B, Silicon
Explanation:
The valency of Carbon is 4 as it has four electrons in its outermost shell
The valency of Si is also four hence C
Hence Silicon can form 1:1 bond with the carbon
Valency of Beryllium is 2, hence it can not form 1:1 bond with carbon. Similarly the valency of oxygen and carbon are way different to form 1:1 bond
hence, only option B is correct
How does competition among different species lead to extinction?
[tex]\huge{\textbf{\textsf{{\color{pink}{An}}{\red{sw}}{\orange{er}} {\color{yellow}{:}}}}}[/tex]
Interspecific competition often leads to extinction. The species that is less well adapted may get fewer of the resources that both species need. As a result, members of that species are less likely to survive, and the species may go extinct.
Thanks Hope it helps.How does the atmospheric pressure at altitudes above sea level compare with atmospheric pressure at sea level?
A. The atmospheric pressure above sea level is higher.
B. The atmospheric pressure at sea level is higher.
c. The pressures are the same.
D. Differences in pressures cannot be determined.
Answer:
Option B
The atmospheric pressure at sea level is higher.
Explanation:
Atmospheric pressure can simply be understood as the weight of the air molecules in the atmosphere. The higher we go up into the atmosphere, the thinner the air becomes. This means that the air present at higher heights is not so much, and hence, the air is lighter. This is why most fighter jets and mountain climbers need oxygen tanks to breathe properly.
Due to the fact that the air is less dense (lighter) at higher altitudes, it also means that the atmospheric pressure at higher altitudes is less.
Therefore, the atmospheric pressure at the sea level is higher than the atmospheric pressure at altitudes above sea level
Answer:
B. The atmospheric pressure at sea level is higher.
Explanation:
What part of the stem transports water and nutrients to the rest of the plant?
A) root cells
B) bark
C) xylem
D) phloem
Answer:
C) xylem
Explanation:
Use the reaction below for the decomposition of sodium azide
to sodium metal and nitrogen gas.
2NaNg(s) + 2Na(s) + 3N2(g)
What volume of nitrogen at STP is generated by the decomposition of 130.0 g NaNz?
Answer: The volume of nitrogen gas at STP is 44.8 L.
Explanation:
The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation for it follows:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ...(1)
We are given:
Given mass of [tex]NaN_3[/tex] = 130.0 g
Molar mass of [tex]NaN_3[/tex] = 65.01 g/mol
Using equation 1:
[tex]Moles of NaN_3=\frac{130.0 g}{65.01g/mol}=2mol[/tex]
For the given chemical equation:
[tex]2NaN_3(s) \rightarrow 2Na(s) + 3N_2(g)[/tex]
By the stoichiometry of the reaction:
2 moles of [tex]NaN_3[/tex] produces 3 moles of nitrogen gas
At STP:
1 mole of a gas occupies 22.4 L of volume
So, 2 moles of nitrogen gas will occupy [tex]=\frac{22.4L}{1mol}\times 2mol=44.8L[/tex] of volume
Hence, the volume of nitrogen gas at STP is 44.8 L.
Which is an example of cooperation?
individual ants together make up an ants’ nest
when an organism is more successful at hunting than another
when an organism finds a new way to get itself water
when people get together to stop the killing of the hawks, skunks, and weasels
Consider the statement, “In a chemical reaction, atoms are neither created nor destroyed, only rearranged.” Why is this a statement of the law of conservation of mass?
Answer: The law of conservation of mass is reffering to the fact that energy cannot be created or destroyed. So when you speak about atoms not being created or destroyed it is the same thing. Unless you're talking about an atomic bomb where the atoms are split.
In a chemical reaction, the total mass present is equal to the mass of all the atoms undergoing the reaction.
According to the law of conservation of mass, mass is neither created nor destroyed but can be converted from one form to another. In a chemical reaction, atoms are rearranged. However, the total number of atoms in the system remains constant.
So, the total mass present in the system is equal to the mass of all the atoms undergoing the reaction. Since atoms are only rearranged, no new atom is formed and no atom disappears in the reaction, the total mass of the system remains constant.
For this reason, the statement; “In a chemical reaction, atoms are neither created nor destroyed, only rearranged" is a statement of the law of conservation of mass.
Learn more: https://brainly.com/question/13383562
Write the molecular formula of poly(glycine)
Answer:
C2H5NO2
Explanation:
Glycine | C2H5NO2 - PubChem.
weight of glycine= 75.07 g/mol