Answer:
Allow substances to enter and leave the cell=Cell Membrane
Store water or fluids=Vacuole (vacuoles are much bigger in plant cells)
Powerhouse of the cell=Mitochondria
Produce protein=Ribosome
The cell ‘post office’ modify, sort and package protein=Golgi Bodies
Control the life process of the cell=Nucleus
____ are the forces of attraction between positive metal ions and the valence electrons that surround them.
The forces of attraction that exists between positive metal ions and their surrounding valence electrons is called: metallic bonds.
A chemical bond can be defined as the forces of attraction that exists between ions, crystals, atoms or molecules and they are mainly responsible for the formation of all chemical compounds.
In Chemistry, there are different types of chemical bonds and these are:
Hydrogen bonds.Covalent bonds.Ionic bonds.Metallic bonds.A metallic bond can be defined as the forces of attraction that exists between positive metal ions and their surrounding valence electrons.
This ultimately implies that, metallic bond are peculiar to positively charged metals but not negatively charged metals or non-metals.
Read more: https://brainly.com/question/24212500
water is formed when 48g of oxygen combine with 6g of hydrogen. what mass of oxygen combines with 2g of hydrogen
Answer:
16g of oxygen reacts with 2 g of hydrogen to form 18g of Water
What gas in our atmosphere is thought to have come from plants and algae alone?
Answer:
Oxegen
Explanation:
All that oxygen has to come from somewhere. You might already know that it comes from photosynthetic organisms like plants.
The electron configuration for Helium (He) is shown below.
1s2
Which diagram shows the correct distribution of electrons in the electron shells of a helium atom?
Answer:
3rd image
Explanation:
An atom that gains one extra electron forms an ___________with a 1- charge.
Explanation: When an atom gains/loses an electron, the atom becomes charged, and is called an ion. Gaining an electron results in a negative charge, so the atom is an anion.
balance CHCl3 + O2 = CO2 + H2O + Cl2
Answer:
2CHCl3 + 5/2 O2 => 2CO2 + H20 + 3Cl2
Explanation:
Left Hand Side(LHS)
We have CHCl3 and O2
Right Hand Side(RHS)
We have CO2, H2O and Cl2
Balancing
To make sure that they have same values, put 2 before CHCl3 giving 2CHCl3 and 3 on Cl2(RHS) for chlorine gas giving 3Cl2
H2O remains the same
Before CO2 put 2 giving 2CO2
To make sure that oxygen is balanced put 5/2 before it. This gives 5/2 O2 (2 cancels out don't worry)
Combining all;
2CHCl3 + 5/2 O2 => 2CO2 + H20 + 3Cl2
I hope this helps. Have a nice studies.
Chemical & Earth Science Name:______________________________________
Date: ________________________________
Nonmetals & Metalloids Worksheet
Write the letter of the correct answer on the line at the left.
1. _____ Which of the following is NOT a
property of most nonmetals?
A found on the right side of the
periodic table
B solids tend to be dull and brittle
C excellent electric conductivity
D many are gases at room temperature
3. _____ Two of the same atoms bonded
together is called a(n)
A isotope
B diatomic molecule
C binary atom
D semiconductor
2. _____ The only nonmetal in Group 14 is
A carbon
B oxygen
C nitrogen
D fluorine
4. _____ The highly reactive nonmetals of
Group 17 are called the
A noble gases
B metalloids
C halogens
D actinides
If the statement is true, write true. If the statement is false, change the underlined word
or words to make the statement true.
5. ___________________ Atoms of nonmetals usually lose electrons when they combine
with other atoms.
6. __________________ When two or more atoms bond by sharing electrons, they form
a molecule.
7. __________________ The elements that have some properties of metals and some
properties of nonmetals are called halogens.
8. __________________ Helium has chemical properties so different from those of the
other elements that it cannot be placed in any group.
9. __________________ Substances that can carry electric current under some
conditions but not under others are called semiconductors.
10. __________________ The Group 15 element oxygen is used to make compounds
known as fertilizers.
Answer:
whoa this question is long
Explanation:
how did u write it gosh
Suppose that you experimentally determine the molar extinction coefficient (ε) of a complex ion sample to be 8171 L/mol-cm at 510 nm. The literature value for the ε of the complex ion sample is reported as 8400 L/mol-cm. What is the percent purity of your experimental sample
The percent purity of your experimental sample is 97.3 %
The percentage purity % = impure value/pure value × 100 %.
Actual value of molar extinction coefficient = impure value = 8171 L/mol-cm, pure value = literature value = 8400 L/mol-cm.
Substituting the values of the variables into the equation, we have
% purity = 8171 L/mol-cm/8400 L/mol-cm × 100 %
% purity = 0.9727 × 100 %
% purity = 97.27 %
% purity ≅ 97.3 %
The percent purity of your experimental sample is 97.3 %
Learn more about percentage purity here:
https://brainly.com/question/17836636
Some copper is palced in a previouly weighted crucible and reweighed .
Mass of crucible + copper = 5.92g
Mass of crucible = 4.65g
Clculate the mass of copper used in the experiment
We can find the mass of copper by finding the difference between the mass of the crucible and the copper, and just the crucible. This is possible since the mass that is left would be attributed to just the copper.
Mass of copper = (Mass of crucible + copper) - Mass of crucible
= 5.92 g - 4.65 g
= 1.27 g
When asked why a chlorine atom gains one electron to form an anion with a 1- charge, a classmate answered, "Because noble gas configurations are stable." Is this statement generally true?
Noble gases have the maximum number of electrons in their outer shell. The statement made by the student about the stability of noble gases is generally true.
It is true that noble gases are stable elements. This can be attributed to the fact that they have the complete number of elements in their outer shell. That is why they hardly participate in any reactions. The chlorine atom receives an electron from a donor element and attains a negative charge. When two chlorine atoms bond covalently, they share electrons and thus attain the noble state configuration.Learn more here:
https://brainly.com/question/18349740
discrib acidic oxide that can be Thermal Decomposetio of carbonat
BRAINLIEST
How many DIFFERENT elements are involved in the equation shown below?
Answer:
5
Explanation:
The elements contained in this equation are:
Na
Cl
H
S
O
Carbon tetrachlordie (CCI4) is ___
A. iconic
B. Covalent
Answer:
b
Explanation:
An unknown element X forms a compound with chlorine: XCL2. Predict the chemical formula of the compound that element X makes with oxygen. Justify your answer.
This table displays which one is it A. Price values of the metals ,B. Physical properties of the metals ,C. Chemical properties of the metals ,D. Corrosive resistance of the metals
Answer:
b the physical components
What can you say about the reactants of photosynthesis and the products of cellular respiration?
Answer:
The reactants of cellular respiration are oxygen and sugar, which are the products of photosynthesis
Explanation:
I need help with this
Answer:
87 (whatever unit its using)
How mang millimoles of solute are contained in 2.00L of 2.76×10^-3 M of KMnO4
Answer:
5.52
Explanation:
2.76 10^-3 M = 2.76mM
2.76mM*2L= 5.52mmol
Which of the following is similar in size to an atom?
O A ball used in sports, such as a basketball
O A large building, similar to a shopping mall
O A particle you cannot see with your eyes
O A seed of a fruit from an apple or orange
One of the few resources on Mars is
Answer:
iron .. titanium.. nickel....aluminum... sulfur... and calcium
write True If the statement Is Correct And False If Not
Answer:
11.false12.true13.true14.false15.true16.false17.false18.false19.true20.false21.PC22.CC23.PC24.CC25.CCExplanation:
I think it is helps youSuppose that you are dissolving a solute into 500 mL of water at 0°C. You find that no more than 495 g of solute will dissolve. Calculate the solubility of the solute in g/L.
Answer:
500 m 495 g its 900 mL
Explanation:
Please help I will give brainliest ;3
Answer:
oxygen, carbondioxide
carbondioxide, oxygen
Do all particles pass right through the atoms undeflected?
AnswereYs
Explanatioynt:Yes
why does magnesium in an aqueous solution of magnesium chloride conduct electricity but solid magnesium chloride does not?
Answer:
Delocalized electrons
Explanation:
Magnesium Chloride is an ionic compound, so its lattice structure prevents the flow of electrons. However, when you convert the ionic compound into an aqueous solution it allows movement of electrons/ions due to the breakdown of the molecular forces which make it conductible. In short, Ionic compounds as a solid are not conductible but they are in an aqueous form.
a brief description of atoms and how they relate to
molecules and compounds
Answer:
Explanation:
Atoms are the thing that make up molecules and compounds. Molecules contain two or more atoms and are held together by covalent bonds
Question
How are chemical equations balanced?
Answer:
According to the law of conservation of mass, when a chemical reaction occurs, the mass of the products should be equal to the mass of the reactants. A balanced chemical equation occurs when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side
I need help with this question please
1-propanol is the correct answer.
Element with the largest electron cloud
Out of the answer choices, rubidium has the highest energy valence shell. With a single electron in the fifth energy level, krypton will have the highest number of energy levels of the group I elements listed.
kasama na po jan ang explenation
concepts of oxidation numbers and how to learn them
Answer:
yes is it yes yes yes yes yes yes yes yes yes yes
