I need help please comrades, I will give 5 stars and mark you guys as the brainliest
Answers
Explanation:
Alkali metals have low melting points, low electronegativity, and low ionization energies. They are malleable and ductile. They are also good conductors of heat and energy.
Since they have one electron in their valence, alkali metals are very reactive. This means that they are not found alone in nature.
Related Questions
Mercury is a liquid metal having a density of 13.6 g/mL. What is the volume of 1.50 lb of mercury metal? 1kg = 2.2 lbs
Hint: Convert lbs to kg to g then solve for volume.
a: 19.9 mL
b: 50.1 mL
C: 11.0 mL
D: 33.4 ml
Answers
Answer:
The answer is option BExplanation:
The denisty of a substance can be found by using the formula
[tex]Density(\rho) = \frac{mass}{volume} [/tex]Making volume the subject we have
[tex]volume = \frac{mass}{Density} [/tex]From the question
Density = 13.6 g/cm³
mass = 1.50 lbs
We must first convert the lbs to grams in order to solve
That's
if 2.2 lbs = 1 kg
Then 1.50 lbs = [tex] \frac{1.5}{2.2} [/tex]
= 0.681 kg
If 1 kg = 1000 g
Then 0.68 kg = 0.681 × 1000 = 681g
So the mass = 681 g
Substitute the values into the above formula and solve for the volume
That's
[tex]volume = \frac{681}{13.6} [/tex]= 50.0735
We have the final answer as
50.1 mLHope this helps you
Lab Safety
What should you do if a piece of lab
equipment is broken?
J. Try to fix it.
k. Tell a teacher immediately.
L. Pick up broken glass immediately
before anyone gets hurt.
M. Pretend like nothing happened.
Q3
Answers
Answer:
Tell a teacher immediately
difference between sodium ion and sodium atom.
(give in points not in paragraph)
Answers
Answer:
Explanation:
SODIUM ATOM;
SODIUM ATOM IS NEUTRAL
SODIUM ION;
IT IS A CHARGED SPECIE WITH A CHARGE OF +1
SODIUM ATOM:
THE NUMBER OF PROTONS AND ELECTRONS ARE SAME ie:11
SODIUM ION:
NUMBER OF PROTONS AND ELECTRONS ARE NOT SAME ie. ELETRON: 10, PROTONS:11
HOPE IT WILL HELP:)
Practicing Density Calculations: A 4.80 gram piece of magnesium displaces 2.76 mL of water when it’s placed in a graduated cylinder . What is the density of the magnesium?
Answers
Answer:
1.74 g/mL
Explanation:
Step 1: Given data
Mass of magnesium: 4.80 g
Volume of water displaced: 2.76 mL
Step 2: Calculate the volume of the piece of magnesium
The volume of the piece of magnesium is equal to the volume of water displaced in the graduated cylinder.
Step 3: Calculate the density of magnesium
The density of magnesium is equal to its mass divided by its volume.
ρ = m / V
ρ = 4.80 g / 2.76 mL
ρ = 1.74 g/mL
Chemicals used in a laboratory investigation must be safely discarded. Which method is the safest way to dispose of chemicals at the conclusion of a laboratory activity
Answers
Answer:
Disposing of the discarded chemicals can be done by certain sfae methods mention as follows:
Explanation:
Most of the chemical wastes are dispose through the EHS waste program. Organic chemicals and solvents that can not be drain should be closed in a tight fitted container that has label on it as Hazardous waste, including strong acid and corrosive liquids.
Recycling of these chemicals and incineration is also use for the industrial chemical waste under professional guidance. Incineration is the process of burning chemicals in to ash through high thermal burning.
A sample of gasoline contains various hydrocarbons, which comprise atoms of carbon, hydrogen, and oxygen. The hydrocarbons mix together uniformly to form gasoline. Which term or terms could be used to describe this sample of gasoline
Answers
Answer:
mixture homogenous mixture (of hydrocarbons)compoundExplanation:
Mixture can be easily separated by physical methods. Homogeneity and heterogeneity of a mixture is determined by whether the components there in are in a single phase and evenly distributed or not.
A solution has a solute evenly dissolved in solvent to form a liquid substance.
An element is the basic form of substance which cannot be broke down into any other simpler unit.
I hope this was helpful.
As a sound source approaches someone, the frequency of the sound wave
Answers
Answer:
The Doppler effect is a change in the frequency of sound waves that occurs when the source of the sound waves is moving relative to a stationary listener. As the source of sound waves approaches a listener, the sound waves get closer together, increasing their frequency and the pitch of the sound.
Explanation:
pls help
will give the brainliest!
Please answer correctly
Urgent!!!!
Answers
a)Green color appears.
Burning splint test tells us us that it is hydrogen gas.
b)[tex]Ni+ H_2SO_4 \longrightarrow NiSO_4 + H_2 \uparrow[/tex]
c)There would be an effervescence. Upon passing the gas through lime water it turns milky $\implies$ gas is Carbon Dioxide.
d)$\NiCO_3+ H_2SO_4 \longrightarrow NiSO_4 + CO_2 +H_2O$
Which sig figs rule(s) apply in determining how many sig figs are in the number below?
Select all that apply.
92.064
5
Rule #4
Rule #2
Rule #3
Rule #1
Rule #5
Answers
Explanation:
For 92.064 the rule that is applied is all digits between two non-zero digits are significant.
For 5, the rule is all non-zero digits are significant
The diagram illustrates a type of plate boundary. Which crustal feature is most likely to form at this type of
boundary?
1. trench
2. ridges
3. tsunami
4. earthquake
Answers
A ridge is the only option that forms when plates move apart. The other options happen when the plates collide.
Abby fills a graduated cylinder with 3 mL of water. She then
drops a small rock into the cylinder, and the water level rises
to the 5 mL mark. What is the volume of the rock?
mL
Answers
Answer:
The volume of the rock is 2 mL
Explanation:
The level to which the graduated cylinder is filled with water by Abby = 3 mL
The level to which the graduated cylinder after the rock is dropped in = 5 mL
Therefore;
The volume of the rock = The level to which the graduated cylinder after the rock is dropped in - The level to which the graduated cylinder is filled with water by Abby
The volume of the rock = 5 mL - 3 mL = 2 mL
The volume of the rock = 2 mL.
is a toothpick a good model for showing the strength and brittleness of salt ?
Answers
Answer:
no a toothpick is stronger
Explanation:
i would not seem right
Dec
Match each concept to the scientist who supported it.
Isaac Newton
Heinrich Hertz
Light is a wave because this property can
explain interference
Light is a wave because it bends when it
hits barriers and openings.
Light is made of particles because it travels
only in straight paths
Light is a wave made of electric and
magnetic fields
Light is a wave that has similar properties
James Clerk Maxwell
Christiaan Huygens
Thomas Young
as radio waves
Answers
Answer:the pic
Explanation:
given the volume of a cube is 75 cm3 and the mass is 15 grams what is the density
Answers
Answer:
Density = 0.2 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]Density = \frac{mass}{volume} [/tex]From the question
mass of cube = 15 g
volume = 75 cm³
Substitute the values into the above formula and solve for the density
That's
[tex]Density = \frac{15}{75} [/tex]Density = 0.2 g/cm³Hope this helps you
Write a simple procedure for measuring out 2.6 grams of sodium bicarbonate NaHCO3 or commonly known as baking soda?
PLEASE I REALLY NEED THIS!!! :/
Answers
Answer:
See explanation
Explanation:
Since baking soda is a solid, all we need is to have a spatula, a filter paper and a triple beam balance.
The triple beam balance is set at zero and the filter paper us placed on the triple beam balance. This is the ensure that the mass of the filter paper is recorded as zero gram.
The triple beam balance is now adjusted to 2.6 g and sodium bicarbonate is added to the filter paper on top of the beam balance using a spatula. The 2.6g mass is the point when the pointer of the triple beam balance focuses at the zero mark.
1. Based on this graph, how does metal A differ from metal B?
A. Metal A is have higher density than metal B.
B. Metal B has higher density than metal A.
C. Both metals A and B have the same density.
D. None of the abaove.
Answers
Answer:
B.Metal B has higher density than metal A
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, the correct option is option B that is Metal B has higher density than metal A.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.
Mathematically, the formula for density can be given as
Density = Mass of the substance ÷volume marked on the graduated cylinder
From given graph we can see that Metal B has higher density than metal A since the mass of metal B is higher than mass of metal A.
Therefore, the correct option is option B that is Metal B has higher density than metal A.
To know more about density, here:
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If Maria winks exactly five times every minute and she sleeps exactly eight hours every day, how many times does Maria blink every day
Answers
Answer:
4800 times a day
Explanation: she blinks 300 times every hour and i times it by 16 as the hours everyday (24-8) so 300 x 16 equals 4800
4. Isotonic solution are the solution
having same
1. Concentration
2. surface tension
3. osmotic pressure.
4. viscosity
Answers
Answer:
My answer is concentration.
describe in brief the process of extracting Petroleum from its reserve
Answers
Answer:
There are three steps to the Petroleum refining process; separation, modification, and treatment. It would be impossible to drive without gas or diesel fuel. Learn how we get petrol and crude oil and more about gasoline or oil refineries. What is Petroleum? Petroleum is a natural phenomenon.
Explanation:
Which is NOT one of the 3 dimensions of the Science Standards
Framework?
3 dimensions of the science standards framework
Answers
Answer:
The term "three-dimensional learning" refers to the three pillars that support each standard, now called "performance expectations." These three dimensions are: Science and Engineering Practices, Crosscutting Concepts, and Disciplinary Core Ideas. You can use this rubric to evaluate your own curriculum for NGSS.
Explanation:I HOPE IT HELP
What is the coefficient of hydrogen, H 2, when the following equation is balanced? Al + H 2SO 4 → Al 2(SO 4) 3 + ? H 2
Answers
Answer:
3
Explanation:
Balancing the equation:
Original equation: Al + H2SO4 → AL2(SO4)3 + H2
We see that in aluminum in AL2(SO4)3 there is a subscript 2.
We put a 2 in the front of the reactant Al.
We also see a subscript 3 behind (SO4).
We add a 3 in front of H2SO4.
Now we have to balance the H2 on both sides. We add a 3 in front of the H2 on the right as there is 3 H2 molecules on the left.
2Al + 3H2SO4 → AL2(SO4)3 + 3H2
I hope it helps :)
The coefficient of hydrogen is 3
How do find the coefficient of hydrogen?The numbers placed in front of formulas to balance equations are called coefficients, and they multiply all the atoms in a formula.
Balancing the equation:
Given, the equation: Al + H2SO4 → AL2(SO4)3 + H2
We see that in aluminum in AL2(SO4)3 there is a subscript 2.
We put a 2 in the front of the reactant Al.
We also see a subscript 3 behind (SO4).
We add a 3 in front of H2SO4.
Now we have to balance the H2 on both sides. We add a 3 in front of the H2 on the right as there are 3 H2 molecules on the left.
2Al + 3H2SO4 → AL2(SO4)3 + 3H2
A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.
Learn more about balanced equations here: https://brainly.com/question/17056447
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Isotopes of an element have the same number of protons but different numbers of what?
I have no idea what subject to put this under qwq
Answers
Answer:
Isotopes is a phenomenon whereby atoms of the same element exhibit different mass numbers but have the same atomic number.I hope this helps... Thank you for the question
HELP ASAP
A pure sample of gold has a volume of 25.0 cm and a mass of 483 g. What is the density of gold?
0 cm
0.0514 g/cm3
0.00197 g/cm
19.4 g/cm
508 g/cm3
Answers
Answer:
the correct answer is D
Explanation:
The density of gold is 19.4g/cm
The density of gold is found to be 19.32 g/[tex]cm^3[/tex] when it has a volume of 25.0 cm and a mass of 483 g.
What is density?Density may be defined as a type of physical quantity that describes the mass per unit volume of any substance. The formula for density is d = M/V, where d is density, M is mass, and V is volume. It is commonly expressed in units of grams per cubic centimeter.
It is a word we use to describe how much space an object or substance takes up (its volume) in relation to the amount of matter in that object or substance (it's mass).
Another way to put it is that density is the amount of mass per unit of volume. If an object is heavy and compact, it has a high density.
According to the context of this question,
The mass of gold = 483 g
The volume of a pure sample of gold = 25.0 cm.
The formula for calculating density is as follows:
Density = Mass/Volume.= 483g/25.0 cm = 19.32 g/[tex]cm^3[/tex].
Therefore, the density of gold is found to be 19.32 g/[tex]cm^3[/tex] when it has a volume of 25.0 cm and a mass of 483 g.
To learn more about Density, refer to the link:
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Calculate the number of grams of sulfuric acid in 1 gallon of battery acid if the solution has a density of 1.30 g/mL and is 38.8 % sulfuric acid by mass.
Answers
Answer:
The number of grams of sulfuric acid in 1 gallon of battery acid is 1909.4 g.
Explanation:
We have:
V = 1 gallon = 3785.4 mL
% m/m = 38.8 %
The number of grams of sulfuric acid can be calculated as follows:
[tex] m = 1.30 \frac{g}{mL}*3785.4 mL*\frac{38.8}{100} = 1909.4 g [/tex]
Hence, the number of grams of sulfuric acid in 1 gallon of battery acid is 1909.4 g.
I hope it helps you!
The relative formula mass (M) of XCO, is 84
Relative atomic masses (A.): C = 12 O = 16
Calculate the relative atomic mass (A) of X.
Answers
Answer:
x = 56
relative atomic mass is 58.933
Explanation:
finding the relative molecular mass of x first...
x + (C ×1) + (O ×1) =84
x + (12 ×1) + ( 16 × 1) =84
x + 12 + 16 =84
collect like terms
x = 84-12+16
x= 56
now...
half of 56...
56÷2 =27
and 27 is the atomic number of cobalt...
so relative atomic mass of cobalt is 58.933.
1. What are the subatomic particles that all atoms are made of?
*
Answers
Answer:
The three main subatomic particles that form an atom are protons, neutrons, and electrons.
A 1.0 mole pure sample of molten tin is dissolved in a 5.0 mole pure sample of molten copper. The solution is set aside to cool and solidify. The atomic radius of tin is 140 pm and the atomic radius of copper is 128 pm. a. Identify the type of alloy that is formed. Justify your answer. b. Identify the solvent in this solution. Justify your answer.
Answers
Answer:
a. Bronze
b. Copper
Explanation:
a. The alloy formed from the mixture of molten tin and molten copper, with copper having the over triple of the quantity of tin, is bronze. Although, these two metals are often not the only metals present in bronze.
b. The solvent in this mixture is molten copper. This is because, it has the larger percentage of the constituents and hence can easily allow other constituents to be dissolved in it.
The characteristics of the mixtures allow to find the answers to this question about bronze are:
We have a homogeneous solution The solute is tin and the solvent is copper
In chemistry when materials do not react with each other, a new compound is not formed, therefore there is a mixture of unreacted elements.
The mixture is the union of two or more components united, but that do not react chemically, we can have two types of mixture:
Homogeneous. In this case the materials cannot be distinguished from each other, this special case is called a solution. Heterogeneous. There is a heterogeneous composition that can be distinguished. The parts of can be separated by physical methods, for example: deposition in time, filtration, etc.
In mixtures, the material that is in less quantity is called solute and the material that is in greater quantity is called solvent.
In this case we have a combination of Tin and Copper, by heating when they are taken to the liquid state the mixture is formed, the result is a material where no phase or separation can be distinguished, therefore we are in the presence of a homogeneous solution, that cooling would be a solid solution.
Therefore, copper and tin maintain their chemical properties, but the physical properties are altered, this solution is widely used industrially and is called Bronze.
We have 1 mole of tin and 5 moles of Copper, so the solute is the material in the least amount of Tin and the solvent is the material in the greatest amount of Copper.
In conclusion, using the characteristics of the mixtures we can find the answer to this question about bronze:
We have a homogeneous solution in solid state The solute is tin and the solvent is copper
Learn more about mixtures here:
https://brainly.com/question/6457617
How many additional electrons does this atom of oxygen need in its valence shell to satisfy the octet rule?
Answers
Answer:
2
Explanation:
cause it is what it is :> mark me brainlest
Answer:
A-two
Explanation:
13) 2.4 L to mL
This is for chemistry
Answers
Answer: 2400 milliters
Explanation:
Whh is most carbon compound poor conductor of electricity
Answers
Explanation:
Most of the carbon compound are convalent in nature and all of the electrons participates in bond formation as such there is no free electrons left to conduct electricity. Moreover carbon compound doesn't readily dissociates to form ions, which conduct electricity. Hence carbon compound are poor conductor of electricity.
Answer:
It is because all the valence electrons are used to form covalent bonds. So, there will be no electrons left to flow the electric current through them.
Explanation:
hope it helps