Answer:
Salt is effective as a preservative because it reduces the water activity of foods. .
How many protons does Lithium have?
Answer:
3 ................................
Answer: 3
Explanation:
yes
If 2.1 mL of 70.0% alcohol is added to 6.7 mL of water, what is the percent alcohol (%v/v) in the new mixture?
Answer:
Since we are adding more water to an alcohol solution,
the volume of alcohol in the alcohol will be the same but the volume percent of alcohol will decrease
Initial Volume of Alcohol in the solution:
We are given that 70% of the 2.1 mL solution is alcohol
So, Finding 70% of 2.1
70/100 * 2.1 = 1.470 mL alcohol
Volume of Water in the Solution:
In our initial solution, we have (2.1 - 1.47) mL water
and we add an additional 6.7 mL water in the solution
Hence,
the total amount of water in the solution = (2.1- 1.47) + 6.7
Total amount of water in the solution = 0.63 + 6.7
Total amount of water in the solution = 7.33 mL
Volume of the final solution = 8.8mL
Percent Alcohol in the new mixture:
Now that we know the volume of alcohol and the volume of water in our mixture, we can now find the percent composition of alcohol
Percent of alcohol (%v/v) = Amount of alcohol / 100mL of solution
Percent of alcohol = (1.47 / 8.8) * 100
Percent of alcohol = 0.167 * 100
Percent of alcohol = 16.7
Therefore, in a 100mL solution, we will have 16.7 mL alcohol
Substances which will glow in the dark after being exposed to sunlight are:
radioactive
photosensitive
luminescent
phosphorescent
Answer:
If something glows in the dark it is phosphorescent.
The graph shows the average monthly rainfall for a
forested area.
In which month is a high alert for fire danger most
likely?
A. April
B. August
C. May
D. October
Answer:
The Answer would be A. April
Explanation:
Least amount of rainfall out of all the months we have to choose from.
which gas is the most dense under standard temperature and pressure?
A. H2
B. Ne
C. Ar
D. O2
Answer:
I think it's b: ne
Explanation:
its just a wild guess
Predict: Note the type of reaction you expect for the reactants Kl and Pb(NO3)2
Answer:
double replacement
Explanation:
just did it
Answer:
Double replacement
Explanation:
A black bear can run 35.0 mph how long will it take to run 1.95 x 10^4?
A. 129
B. 0.360
C. None of the above
D. 0.106
E. 13
Answer:
The correct answer is C. None of the above.
Explanation:
To determine how long the black bear will run, the distance it will travel must first be determined. Thus, the proposed calculation must be solved.
1.95 x 10 ^ 4
1.95 x 10 x 10 x 10 x 10
19.5 x 10 x 10 x 10
195 x 10 x 10
1950 x 10
19500
Thus, the bear will run 19,500 miles, so, running at 35 mph, it will take about 557 hours to run that distance (19,500 / 35).
Calculate the number of molecules in 2.00 moles H2S.
Express your answer numerically in molecules.
Answer:
The answer is
1.204 × 10²⁴ moleculesExplanation:
The number of molecules can be found by using the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 2 × 6.02 × 10²³
We have the final answer as
1.204 × 10²⁴ moleculesHope this helps you
chemistry question please help
Answer:
AR(18)
Explanation:
Try that it should work
*(
why some metals are more dense than others
Is br a magnetic or non magnetic
Answer: Non-magnetic
Explanation:
Answer:
br is a non magnetic. hope this helps.
PLEASE HELP ASAP‼️ Which of the following elements has the highest metallic character
A. Zt
B. Rh
C. Hf
D. Co
Answer: C
Explanation:
What else heats the Earth when Permafrost melts?
Answer:
As those microbes thrive, they will release large amounts of methane, another climate-warming greenhouse gas. ... By the year 2100, they estimated, thawing permafrost could release enough carbon dioxide and methane to raise the average global temperature by 0.13 to 0.27 degree C (0.23 to 0.49 degree F). pls mark me brainlest :(
Explanation:
Pls help I am confused my sister got me sweating
Answer:
Im pretty sure its B. is released by salivary glands.
Explanation:
Chemical properties can be observed without changing the substance
Answer:
chemical properties can only be measured only by changing a substance chemical identity
Explanation:
apex
Can someone please help?
Answer:
On Question 3
Explanation:
try using any type or liquid like water, milk, soda, juice, coffee, tea, beer, or wine or any type and use the following questions by using a measuring cup from the kitchen tooling shelf. Use that to answer the question and see if that helps. your welcome btw
Weather is not the same as climate. Which claim
identifies the main difference between these two concepts?
A. The main difference is how both are measured
B. Only weather includes information about the
temperature
C. Only climate includes information about
precipitation
O D. The main difference is the length of time over
which both are measured
Answer:
b. only weather includes information about the temperature
The phase of matter most likely to be present at absolute zero would be:
A)
plasma
B)
gas
C)
liquid
D)
solid
Answer:
D solid
Explanation:
3. Using the periodic table,
What is the average atomic mass of bromine?
What is the average atomic mass of magnesium?
How do your calculated answers in #1 and #2 compare to those on the periodic table?
Answer:
79.904 u for bromine
24.305 u
Not really sure what the 3rd question is asking
Explanation:
How many grams of lithium hypochlorite (LiClO) are there in 0.649 mol ?
Answer:
37.9 or 38 grmas approximately
How much space does 2 x 1022 atoms of copper take up?
How much space do 2 x 1022 copper pennies take up, using examples from the animation?
Answer:
2044
Explanation:
A mineral breaks into cubes when struck with a rock hammer. It also leaves a red trail when scraped against an unglazed porcelain plate.
Which of the mineral's properties are being measured?
Choose the two correct answers.
streak
color
cleavage
hardness
The two properties which can be measured from the given information are streak and cleavage of the mineral.
What are minerals?Minerals are naturally forming inorganic substances having crystal structure and metallic characteristics. They have a definite chemical composition and homogeneity.
Streak is the color of powder form of mineral and cleavage is how the mineral cleave when we cut through a plane. Hardness says how much hard the solid is.
When the mineral breaks into cubes when struck with a hammer, we measure its cleavage properties. The red trail on scrapping indicates the streak of the mineral.
Hence, the two properties we can measure from breaking by hammer and scrapping by an unglazed porcelain are its cleavage and streak.
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Explain how scientists know the composition of the bottom layer of the cust?
how many orbitals are in 6s sublevel
The azimuthal quantum number and magnetic quantum number corresponds to the s orbital is zero. Hence, there is only one m value and thus contains one orbital only.
What are quantum numbers ?The quantum numbers are numbers used to describe the position of an electron within an orbital. The principal quantum number n indicates the main energy level. The azimuthal quantum number l indicates the shape and type of orbital which have values from 0 to n-1.
The magnetic quantum number m indicates the number of orbitals for a sublevel. m can have values from + l to -l. The fourth quantum number s is called spin quantum number. For an electron the spin quantum number can be +1/2 or -1/2.
The n value for the 6s sublevel is 6. The azimuthal quantum number , l for an s orbital is zero. So its m quantum number has only one value that is zero. Hence, there is only one orbital in 6s sublevel.
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I NEED HELP ASAPPPP!!!!
Is a styrofoam ball heavier than a rock?
Is water heavier than a ping pong ball?
Is a gold ring heavier than a pencil?
Is oil heavier than water?
Is a large log heavier than a small rock?
Answer:
Styrofoam could be heavier than a rock depending on how much weight you put on it,
Water is heavier than a ping pong ball,
A gold ring is not heavier than a pencil,
Oil is heavier than water because of the combined mass.
A large log is heavier than a small rock.
Explanation:
What is the density of a substance with a mass of 15.0 g and a volume of 5.0 mL?
A. 0.33 g/mL
B. 3.0 g/mL
C. 10.0 g/mL
D. 20.0 g/mL
Answer:
B. 3.0 g/ml
Explanation:
density formula: mass/volume
15/5=3
Determine the mass defect for the following atom. The mass of a 20 Ne atom is 19.992 44 amu.
Answer:
I will not consider electronic mass here. We know (the masses should have been provided in the question!) that the neutron mass is
1.008701
⋅
amu
and the proton mass is
1.007316
⋅
amu
.
Explanation:
Question answered
Which of the elements listed below would
require the least amount of energy to remove an
electron?
Beryllium
Calcium
Lithium
Sodium?
Answer:
Lithium would require the least amount of energy to remove an electron
Answer:
The answer is actually sodium
Explanation:
Lithium actually requires more than sodium.
Which of the following is an example of a pure substance?
A. beer
C. halo-halo
B. ethyl alcohol
D. silver spoon
Which of the following is true for polar jet streams?
They bring cool air.
They bring warm air.
They blow at the equator.
They blow from north to south.
Answer:
A: They bring cool air.
Explanation:
Took the test and got it correct. :)
Jet streams are fast flowing meandering air currents. Polar jet streams bring cool air through the atmosphere. Polar jets meet subtropical jets at some regions.
What are polar jet streams ?The polar jet stream, which travels through the lower layers of the atmosphere in the Northern Hemisphere, is a swiftly moving band of westerly winds.
The confluence of warm air ascending from the tropics and cold air masses descending from the arctic produces the jet. The denser cold air lowers and deflects the warmer air areas north, creating deep troughs and steep ridges that give the jet stream its wavy appearance.
As pockets of cold air intermittently sneak down from the Arctic, this pattern spreads across the mid-latitudes of North America, Europe, and Asia, producing opposing waves and flows that speed eastward due to the earth's rotation.
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