How might a firefighter use chemistry?
A. Chemistry can help a firefighter plan an escape route through a
burning building
B. Chemistry can help a firefighter understand combustion and how
to put out fires.
C. Chemistry can help a firefighter understand how much of a load
the floors of a burning building can hold,
D. Chemistry can help a firefighter plan an exercise routine to prepare
for fires
Answer:
me has answer
Explanation:
b
Chandra wants to know how many moles are contained in 150. 0 g CCl4 (carbon tetrachloride). What quantity of CCl4 should she use to make this conversion? number of moles molecular mass molar mass mole ratio.
Answer:
Molar mass
Explanation:
The molar mass is the number of grams by which there's exactly one mole of one specific substance. So what you do is divide the grams by the molar mass to obtain the number of moles :).
Answer:
Yep Moler mass is the answer
Explanation:
The web site of the Nobel Prize explains that readers who want to inspect the Curies' notebooks must sign a paper
that states that they are aware of the health risks that are involved with handling the notebooks. What health risk is
most likely to occur from handling the notebooks?
O excessive coughing
o anemia
O muscle cramping
O swelling of the joints
Answer: anemia because Marie curie died of anemia
XTRA POINTS 4 CHRISTMAS
What is an empirical formula?
Explanation:
a formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.
Answer:
The answer is A
Explanation:
its is the chemical formula in which the subscripts are given in the smallest ratio
What are 2 substances that will NOT conduct electricity? Plz explain.
Answer:
Covalent compounds (solid liquid solutions)
non-metal elements are insulators but not conductors of electricity.
Explanation:
Metal elements and carbon (graphite) are conductors of electricity
why does hydrogen fluoride have a high boiling point
The intermolecular bonding for HF is van der Waals, whereas for HCL, the intermolecular bonding is hydrogen. Since the van der Waals bond is stronger than hydrogen, HF will have a higher boiling temperature. Since the covalent bond is stronger than van der Waals, HF will have a higher boiling temperature.
An electron is present at an energy level with an energy of 16.32 x 10−19 J. During a transition to another level, 5.4 x 10−19 J of energy was absorbed. Which of the following is true about the present state of the electron?
Answer Choices:
A. The electron moved down to an energy level and has an energy of 10.92 x 10−19 J.
B. The electron moved down to an energy level and has an energy of 21.72 x 10−19 J.
C. The electron moved up to an energy level and has an energy of 10.92 x 10−19 J.
D. The electron moved up to an energy level and has an energy of 21.72 x 10−19 J.
Answer:
D. The electron moved up to an energy level and has an energy of 21.72 x 10−19 J.
The statement which is true about electrons is that the electron moved up to an energy level and has an energy of 10.92 x 10[tex]^-[/tex]¹⁹ J which is found out as 16.32 x 10[tex]^-[/tex]¹⁹ -5.4 x 10[tex]^-[/tex]¹⁹=10.92 x 10[tex]^-[/tex]¹⁹ J.
What is an energy level?Electrons present in an atom revolve in different orbits which are stationary states and are also called as energy levels. The energy levels are numbered as integers which are also called as principal quantum numbers.
Energy of the stationary state is given as E= -R
1/n² where R
is the Rydberg's constant. When an electron is excited, and it moves from lower to higher energy levels there is absorption of energy, while when it moves from higher energy level to lower energy level it radiates or gives out energy in the form of radiation.
They can also be defined as the distances between electron and nucleus of an atom . Electrons present in K energy level have least energy .Energy level diagrams are studied to understand nature of bonding , placement of electrons in orbits and and elemental behavior under certain conditions.
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Here is Beck's address:
12 Riverdale Lane, Apartment A
San Jose, California
USA
Imagine each of the five parts of Beck's address represents Earth, the Milky Way, the moon, the solar system, or the universe, based on their sizes. Which of the
following parts of Beck's address would represent the solar system?
O California
O 12 Riverdale Lane
San Jose
O USA
Answer:
The answer is San Jose
How does the weather caused by a warm front compare to the weather caused by a cold front?
A: A warm front brings fog, but a cold front brings clouds that form from dry air.
B: A warm front brings rapid changes in weather, but a cold front brings slow changes in weather.
C: A warm front brings widespread cloud cover, but a cold front brings intense sun coverage.
D: A warm front brings rain in humid air on occasion, but a cold front brings thunderstorms in summer.
Answer:
The weather caused by a warm from and a cold front compare by:
D. A warm front brings rain in humid air on occasion, but a cold front brings thunderstorms in summer.
A warm front is a phenomenon in which a warm air mass replaces a cold air mass, creating fog and rain on one occasion. While the cold front is the replacement of a warm air mass by a cold air mass changing the pressure and creating a thunderstorm in the middle of summer. The warm front happens in zones close to the equator and the cold fronts happen in almost every place.
Hope that helps. x
100 POINTS PLEASE HELP
1. What is the molar mass of NaOH?
2.How many atoms are in 3.35 moles of Aluminum?
3.How many moles of CO2 gas are in a 101.25 L container filled with CO2 gas?
4.What is the mass of 13.7 moles of N2 gas?
5.How many moles are in 78.5 molecules of CaCO3?
Answer:
1. 39.997 g/mol
2. 6.022⋅1023 atoms of aluminium
3. 0.026 moles
4. 14 grams is the molar mass of nitrogen meaning that one mole of nitrogen atoms is 14 grams. One mole of any substance has 6.02*10^23 atoms/molecules of that subtance therefore there are 6.02*10^23 atoms of nitrogen in 14g of nitrogen
5. 78.5
Explanation:
what type of elements are involved in covalent bonding
Answer:
non-metals
Explanation covalent bonds occur between elements that are far apart on the periodic table.
The types of elements that are significantly involved in covalent bonding are known as non-metals.
What is Covalent bonding?Covalent bonding may be defined as a type of chemical bonding that may involve the mutual sharing of electrons in order to construct electron pairs between atoms of non-metals. These electron pairs which are formed between atoms are known as bonding pairs or shared pairs.
According to the context of this question, covalent bonds are generally formed between nonmetals. While metallic bonds are the type of chemical bonds which are typically formed between the metallic element.
Another type of bonding may also be formed between elements. This type of bonding is known as Ionic bonding. This chemical bonding mat generally arises between metals and non-metals.
Therefore, the types of elements that are significantly involved in covalent bonding are known as non-metals.
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What is the atomic number of an atom?
Question 3 options:
the number of protons
the number protons and neutrons
the number of neutrons
the number of electrons and neutrons
Answer: The number of protons
Explanation:
What happens when a solid is exposed to sub-zero temperatures?
Answer:
A substance may undergo phase change from a solid to a gas or from a gas to a solid if the temperature it is exposed to is changed very quickly. If the temperature around a solid is raised very quickly, it can sublimate, or phase change from a solid to a gas without existing as a liquid.
Explanation:
If two atoms have very different electronegativities, will this for me ionic bond or a covalent bond
Answer:
It will be a covalent bond.
Explanation:
When two atoms combine, the difference between their electronegativities is an indication of the type of bond that will form. If the difference between the electronegativities of the two atoms is small, neither atom can take the shared electrons completely away from the other atom and the bond will be covalent.
which luquid is known as universal solvent?why?
Answer:
Water.
Explanation:
it can dissolve more substances than any other liquid.
What is the final concentration (M) of a solution prepared by diluting 50.0 mL of a solution to a volume of
AC current is produced by which of the following things?
A. Remotes
B. Generators
C. Lights
D. Lasers
Answer:
B
Explanation:
write a note about wurtz reaction
the atomic number of four elements p,q,r,s are 6,8,10 and 12 respectively. the two elements which can bond ionically are:
Answer:
The atomic numbers of four elements A, B, C, and D are 6,8,10, and 12 respectively. The two elements which can react to form ionic bonds (or ionic compounds) are B (8= 2,6) and D (12 =2,8,2). So D donates its two electrons to B to fulfill their octet.
Explanation:
for the reaction 2nh3(g)↽−−⇀ 3h2(g)+n2(g), if 15.8 grams of ammonia produced 1.87g of hydrogen, what was the percent yield
Answer:
75%
Explanation:
So, the reaction will consume 1 mole of hydrogen gas and produce
1mole H2⋅2 moles NH33moles H2=0.667 moles NH3
at 100% yield. This represents the reaction's theoretical yield.
Now, you know that the reaction produced 0.50 moles of ammonia. This represents the reaction's actual yield.
In order to find the percent yield, you need to figure out how many moles of ammonia are actually produced for every 100 moles of ammonia that could theoretically be produced.
You know that 0.667 moles will produce 0.50 moles, so you can say that
100moles NH3.in theory⋅0.50 moles NH3.actual0.667moles NH3.in theory=75 moles NH3.actual
Therefore, you can say that the reaction has a percent yield equal to
% yield = 75%
What halogen can react with sodium chloride solution to produce chlorine?
Answer:
As electro-negativity decreases from Florine to downwards in the group and only Florine is above Chlorine, so Florine should react with sodium chloride solution to produce chlorine.
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Students in Mr. Garcia's class were having a race! No, not running. Instead they rolled tennis balls down a wooden track. The tennis balls have the same mass and diameter. Using the data table, decide which ball had the MOST kinetic energy.
Answer:
it's entertaining. Energy though is the answer
Helppppppppppppppppppppppppppppp
Answer:
A or B but im going to say A
Explanation:
hope this helped <3
Please Help giving high points. Perform the following mathematical operation, and eport the answer to the correct number of significant figures. 4568/1.3 = [?]
Answer:
1.3 is the value with the lowest sig figs in your question. So we have 2 sig figs.
4568/1.3 = 3513.84615
Now let's change the answer in sig figs.
We know that trailing zeros don't actually count as part of sig figs.
So we can round the answer to 3500, having the 2 sig figs (3 and 5) while the trailing zeros don't count.
Final answer = 3500
PLEASE HELP ASAP I'M SO STRESSED
Answer:
160.3g
Explanation:
We know the equation:
No of moles = mass ÷ Mass of element
We need to find the mass, so make mass the subject of the formula.
Mass = No. of moles × mass of element
Mass = 5 × 32.06
Mass = 160.3g
What is changing if you're accelerating?
Answer:
Acceleration is a vector quantity that is defined as the rate at which an object changes its velocity. An object is accelerating if it is changing its velocity.
hope I help you ☺️❤️⭐
Answer:
your speed
Explanation:
If you start to accelerate, you are bound to move faster
Boron and antimony are good elements to use as
Answer: Semiconductors
Explanation:
Please I need helppppp
Answer:
[tex]FeCl_{2} +H_{2} S->FeS + 2HCl[/tex]
Explanation:
I am assuming that we have to balance this equation. On the left side, we have one Fe, 2 H, 2 Cl, and 1 S. On the right side, we have 1 Fe, 1 H, 1 Cl, and 1 S. Adding a 2 as a coefficient in front of the HCl on the right side will make 2 H and 2 Cl instead, balancing the overall equation.
FeCl_{2} +H_{2} S- > FeS + 2HClFeCl 2 +H 2 S−>FeS+2HCl
magnesium carbonate and sulphuric acid react to form
Answer:
magnesium sulfate + water + carbon dioxide
Explanation:
Which of the following is not an alteration of a document?
additions
obliteration
erasure
O all of these answers
charring
None of these answers
ill give brainley