Answer:
5 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 15 g
volume = 3 mL
We have
[tex]density = \frac{15}{3} = 5 \\ [/tex]
We have the final answer as
5 g/mLHope this helps you.
3. Which of the following are isometries (rigid motions)? (Choose all that apply) (2 points)
a) G (x,y) -----> (x - 2, y - 2)
b) H (x,y) -----> (-y, x)
c) H (x,y) -----> (x , 4y)
d) D (x,y) ---> (3x, 3y)
e) D (x,y) ---> (x + 42, y + 12)
Answer:
The answer is D.
Explanation:
PLEASE MARK AS BRAINLIEST!!!!!Isometries means both x and y will change with same scale factor not dissimilar factors
#1
Factor is -2
Isometries#b
No it's (-1,1)#c
No it's (1,4)#d
Factor is 3
Yes#e
No
how to tell how many valence electrons an atom has?
Answer: Count only the electrons in the highest shell s and p orbitals when determining valence.
Explanation: I'm glad you asked this question. It is often not well explained. The term valence electrons is assigned to only the electrons in an element's highest energy level. These reside only in the s and p orbitals, and not the d or f, as I'll explain later. The s orbital can hold 2 electrons and the p can hold 6. Potassium, K, has an s orbital in its highest energy shell, 4. It contains only 1 electron, so it has a valency of 1.
Calcium, Ca, has 2 in its highest energy level: 4s^2, so it has a valency of 2. Moving to the right, the element scandium, Sc, add another electron, but it goes into the 3d orbital. 3d is in the 3rd energy shell, so it is not counted as a valence electron. Only after we move further right, to gallium, Ga, do we start adding electrons to the 4th energy level again - the 4p orbitals can accept up to 6 electrons. Ga has 3 valence electrons - 2 in the 4s and 1 in the 4p. Oxygen has 2 in the 2s and 4 in the 4p orbitals, for a total of 6. It is close to having a comple outer shell (2 in the 2s and 6 in the 2p). Just 2 more electrons would fill both the 2s and 2p orbitals for a total of 8 valence electrons, a stable configuration (the same configuration as thje stable gas Neon).
5. Which of the following statements illustrates osmosis?
Answer:
there is no following so sorry
Choose the best
1. Aliquid is a form of matter that:
a flows,
b. is easily compressed.
c. has no definite volume.
d. has a definite shape.
Answer:
d. has a definite shape.
Explanation:
The human body is about 9.5% carbon atoms, with a small fraction of that carbon being radioactive carbon-14. Carbon dating is a method of determining the age of things made of once living materials. What information would be needed to find the age of a human fossil or the Dead Sea Scrolls?
Answer:The age can be determined by utilizing carbon-14, a radioactive isotope of carbon.
Explanation:
*20 points* Pls answer questions in a positive way NO LINKS NO FILES Thank you
Answer:
A compound is a substance made of two or more different atoms which are chemically combined(Option B)A mixture is made of two or more substances that are not chemically combined (OptionB)Explanation:
Example of compound(CO)
Example of mixture(Milk)
10. A balloon is blown up to a volume of 18 L at a pressure of 1.0 atm and
298 K. What would the pressure inside the balloon be when its volume
becomes 4.0 L and its temperature is 239 K?*
Answer:
3.6 atm
Explanation:
10. A balloon is blown up to a volume of 18 L at a pressure of 1.0 atm and
298 K. What would the pressure inside the balloon be when its volume
becomes 4.0 L and its temperature is 239 K?*
PV/T = P'V'/T'
(18 X 1)/298 =(P' X 4)/239
so
P' = (18 X 239)/(298 X 4)= 3.6 atm
P'=(18 X 239)/(298 x 4) =
Part E
In which state of matter are the particles the most spread out?
Gas has the most spread out particles.
What caused the water level in the pipe to change when you put the bottle in cold water
Answer:
Water cooled down and contracted.
Explanation:
When water contracts, its volume decreases. When the volume of the water in the bottle system decreases, the water is pulled farther down the clear pipe.
An atom has 21 protons, 24 neutrons, and 18 electrons. Which change will cause the atom to have more negatively charged particles than positively charged particles?
losing two protons
losing four neutrons
gaining three electrons
gaining four electrons
Answer:
ganar tres electrones
Explanation:
Answer:
gaining three electrons
why do you think that sodium chloride has to be heated to 800c before melting, but candle wax will start to melt at 50c?
Answer:
Sodium chloride is an ionic compound which makes it stronger and have a higher melting and boiling point. Candle wax is a covalent compound so it has a low melting point.
Explanation:
PLEASE MARK AS BRAINLIEST!!!!!Please helpp!! I give brainliest!
Answer:
Volume is cut in half
Explanation:
• From boyles gas law
[tex]{ \rm{P \: \alpha \: \frac{1}{V} }} \\ \\ { \rm{P _{1}V _{1} = P_{2}V _{2} }}[/tex]
P is pressureV is volume[tex]{ \rm{(1 \times V _{1}) = (2 \times V _{2})}} \\ \\ { \rm{ \frac{V _{2}}{V_{1}} = \frac{1}{2} }} \\ \\ { \boxed{ \rm{V_{2} : V _{1} = \frac{1}{2} }}}[/tex]
Which is the property of nonmetals to evaporate easily?
brittle
dense
liquid
volatile
Answer:
Volatile
Explanation:
Nonmetal are usually volatile, which means it evaporate easily.
--
Easy.
Answer:
Volatile
Explanation:
Nonmetals are usually volatile, so it means that they can evaporate easily.
What is the formula for the ionic compound formed when potassium bonds with oxygen?
Answer:
A metal oxide with formula K2O. Potassium oxide (K2O) is an ionic compound of potassium and oxygen. It is a base. This pale yellow solid is the simplest oxide of potassium.
Write the law of conservation of matter…
(Please Answer fast)
Answer:
The Law of Conservation of Matter states that matter cannot be created or destroyed. In a physical change, substances can change form, but the total mass remains the same. In a chemical change, the total mass of the reactants always equals the total mass of the products. Materials.
Which of the following is an element?
O CuO
O Na
OCH4
H20
Explanation:
na is element
others are compounds
the various geologic settings in which rocks can melt, metamorphose, or become sediment are ultimately generated by
Geological settings whereby there is melting of rock as well as formation of sediments can be attributed to Plate tectonics .
Plate tectonics can be regarded as theory which explained the Earth's outer shell and how its been divided into solid rocks as well as slabs and its often referred to as Plate.
Plate tectonics explained that there is a large-scale motion plates which Earth's lithosphere is made up.Tectonic processes started about 3.3 and 3.5 billion years ago. Through the generation of Tectonic plate, there are melting of rocks as well as generation of sedimentsThe types of boundaries that exist between those tectonic plates can be categorized into 4, base on the the movement of the plates, and these are;divergent boundariesconvergent boundariestransform fault boundaries plate boundary zonesTherefore, plate tectonic gives explanation about Earth's outer shell.
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earth has two movements in space what are they called ?
Jax designs an expierment to determine how the amount of sodium chloride affects the boiling point of water which is the independent /manipulated variable
Answer:
The amount of sodium chloride.
Explanation:
This is because an independent/manipulated control is something that is changed or controlled by the experimenter. Jax has control over the change of sodium, therefore the answer is the amount of sodium chloride.
I took the test and got this answer right btw. Good luck everyone :)
The opposite of an endothermic reaction is a(n) reaction.
Answer:
The opposite of an endothermic process is an exothermic process, one that releases or "gives out" energy, usually in the form of heat and sometimes as electrical energy.
Explanation:
Hope this helps you. Have a nice day. Please mark as brainliest. It helps a lot. ^_^
distillation could not be used to separate one of the following:
a. rubbing alcohol and water
b. motor oil and brake fluid
c. sand and gold
d. gasoline fractions
i’m not sure but i think it is c
Answer:
It's motor oil and brake fluid
matter is passed down from the living part of an ecosystem to the non living part when witch of the following take place ?
A space that is totally empty without any matter is called
How many moles are in 6.20 x 10^24 molecules of H2O?
Answer:
10.3 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where 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
[tex]n = \frac{6.20 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 10.299003[/tex]
We have the final answer as
10.3 molesHope this helps you
Please answer with the correct answer <3
Substances can be categorized in two ways, as an (element, mixture or compound) or as a (solid,liquid or gas). Which of these methods are of most use to a chemist?
As a chemist, the classification of substances as elements, mixtures, or compounds is of more importance than the state of the substances.
Classification of substancesThe state of substances is mostly obvious to the eyes, even to those that are not chemists. In other words, the state of matter of substances is just a physical property that can be easily discerned.
Whether a substance is an element, mixture, or compound, however, is something that may not be discerned physically without carrying out some chemical analyses.
Thus, a chemist would be more interested in the classification of substances as elements, compounds, or mixtures.
More on classification of substances can be found here; https://brainly.com/question/11446627
Determine whether each of the reactions given below would be spontaneous or not. Please justify your answer in each case.
A. Fe2+ (aq) + Al (s) → Al3+(aq) + Fe (s)
B. Pb2+ (aq) + Sn (s) → Sn2+ (aq) + Pb (s)
C. Mg2+ (aq) + Ag (s) → Ag+ (aq) + Mg (s)
A spontaneous reaction is one in which the change in free energy is negative and the standard cell potential is positive.
For a redox reaction to be spontaneous, the electrode potential of the cell must be positive and this depends on the relative electrode potentials of the species involved in the reaction. A metal can not displace a metal above it in the electrochemical series from solution.
Based on this;
Fe2+ (aq) + Al (s) → Al3+(aq) + Fe (s) is spontaneous because iron is lower than aluminium in the electrochemical seriesPb2+ (aq) + Sn (s) → Sn2+ (aq) + Pb (s) is spontaneous because lead is lower than tin in the seriesMg2+ (aq) + Ag (s) → Ag+ (aq) + Mg (s) is not spontaneous because magnesium is above silver in the series.Lean more: https://brainly.com/question/24556237
1.The chemical or substance used to start a reaction are called
Answer:
Reactants
Explanation:
The substance (or substances) initially involved in a chemical reaction are called reactants or reagents.
Answer:
The substance (or substances) initially involved in a chemical reaction are called reactants or reagents. ... Chemical reactions are described with chemical equations, which symbolically present the starting materials, end products, and sometimes intermediate products and reaction conditions.
Explanation:
Hope this helps...
what are the units for the rate constant of a first-order reaction?
Explanation:
the units for the rate constant of a first-order reaction is :
[tex] = {s}^{ - 1} [/tex]
If you have 10 tasks complete to finish a project‚ how many days will you need to spend working on this course if you spend five days on each task?
A.p.e.x l.e.a.r.n.i.n.g reading skills and strategies
Answer:
Well 50 of course
Explanation:
5 days per tasks is like saying 10 times 5 which is 50.
NEED ANSWER ASAP
Concerning chromatography, why do different colors in the ink separate?
A)Some colors had a greater repulsion for the paper or water. The colors that had a greater repulsion for the paper moved faster, and those with a greater repulsion for the water moved slowly up the paper.
B)Some colors had a greater affinity for the paper or water. The colors that had a greater affinity for the water moved faster, and those with a greater affinity for the paper moved slowly up the paper.
C)Some colors had a greater repulsion for the paper or water. The colors that had a greater repulsion for the water moved faster, and those with a greater repulsion for the paper moved slowly up the paper.
D)Some colors had a greater repulsion for the paper or air. The colors that had a greater affinity for the air moved faster, and those with a greater affinity for the paper moved slowly up the paper.
E)Some colors had a greater affinity for the paper or water. The colors that had a greater affinity for the paper moved faster, and those with a greater affinity for the water moved slowly.
Substances that have greater affinity for the solvent travel faster while the substance that have greater affinity for the paper travel more slowly.
Chromatography involves a mobile phase and a stationary phase. The mobile phase is the solvent that carries the mixture. while the stationary phase is the medium that performs the actual separation
The speed with which components of the ink moves up the paper depends on its affinity for the paper or the water.
The different colors in the ink separate because some colors had a greater affinity for the paper or water. The colors that had a greater affinity for the water moved faster, and those with a greater affinity for the paper moved slowly up the paper.
Learn more: https://brainly.com/question/19334271