Answer:a, c, d
Explanation: just did it on edge
How many protons does Lithium have?
Answer:
3 ................................
Answer: 3
Explanation:
yes
Which of the following is an example of work: bowling or reading? How do you know?
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.
To learn more about minerals, refer the link below:
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Which element is a gas?
A.Br
B.C
C.B
D.Be
Answer:
A.Br
Explanation:
Bromine is the only gas from the choices provided. It belongs to the group of halogens, group 7.
It has atomic number of 35 and it belongs to the p-block on the periodic table.
C is carbon and carbon is a solid matter B is boron and boron is a metalloid Be is beryllium and silvery white metalOnly Bromine is the gas from the given choices. It is fuming liquid and when exposed, it becomes gaseous.
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:
How many protons, neutrons, and electrons are in C -14
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:
why some metals are more dense than others
How many grams of lithium hypochlorite (LiClO) are there in 0.649 mol ?
Answer:
37.9 or 38 grmas approximately
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 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:
What type of bond is present between two atoms of zinc in a nickel
Answer:
Pure covalent
Explanation:
To know the type of bond between two atoms you must find the electronegativity difference of them:
If electronegativity difference is:
< 0.4: Pure covalent.
Between 0.4 and 1.8: Polar covalent.
> 1.8: Ionic.
The electronegativity of Zn is 1.65 and Ni is 1.91. Electronegativity difference is:
1.91 - 1.65 = 0.26
That means the type of bond is:
Pure covalentWeather 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
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:
What molar concentration of hydrochloric acid (HCl) is needed to prepare a disinfectant solution with a pH
Answer:
The correct approach is "3.1×10⁻³ M".
Explanation:
As we know,
[tex]pH=-log[H_{3}O^+][/tex]
[tex]pH=2.5[/tex]
[tex][H_{3}O]^+= \ ?[/tex]
Now,
⇒ [tex]-log[H_{3}O]^+=2.5[/tex]
⇒ [tex][H_{3}O]^+=10^{-2.5}[/tex]
⇒ [tex]=3.1\times 10^{-3} \ M[/tex]
So that the needed molar concentration of HCL will be:
= [tex]3.1\times 10^{-3} \ M[/tex]
Explain how scientists know the composition of the bottom layer of the cust?
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
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.
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:
Which of the following is an example of a pure substance?
A. beer
C. halo-halo
B. ethyl alcohol
D. silver spoon
Which sample matter is a pure substance
Answer:
Explanation:
If you have options, could you please tell me so I can further help you. If you just need an example then
Examples of pure substances include iron, steel, and water
Hope this helps (:
Answer
These are the following answers
A) zinc oxide
B) sugar dissolved in water
C) pond water
D) soil
Explanation:
100 POINTS HELP!!!!!!!!!!!!!!!!!!!!
Given that,
Mass number of Ge = 70
Then,
Atomic number of Ge = 32
No. of protons = 32
No. of electrons = 32
No. of neutrons,
→ 70 - 32 = 30
Answer:
30 is correct
Explanation:
70 - 32 = 30 mark as brainliest
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
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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:
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.
Find more on quantum numbers:
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Pls help I am confused my sister got me sweating
Answer:
Im pretty sure its B. is released by salivary glands.
Explanation:
A sample of an ideal gas has a volume of 2.38 L at 283 K and 1.03 atm. Calculate the pressure when the volume is 1.97 L and the temperature is 307 K.
Gas Has A Volume Of 2.21 L At 287 K And 1.11 Atm. Calculate The Pressure When The Volume Is 1.03 L And The Temperature
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