Answer:
Answer B
It makes basic knowledge easier to learn.
Explanation:
Assessing students’ prior knowledge allows an instructor to focus and adapt their teaching plan. For students, it helps them to construct connections between old and new knowledge.
plz say if it is a b c or d on both
Answer:
whats both
Explanation:
solid added to liquid and the solid floats down to bottom of container physical or chemical change?
Answer:
Physical change
Explanation:
If a calcium atom can give off two electrons in a reaction with
nitrogen, which of the following formulas represent the
compound formed?
a CaN2
b Can
c Ca3N2
d None of the above
Answer:
c. Ca3N2
Explanation:
find the mass in 3.8 moles of magnesium chloride
Explanation:
34.31+35.45(2)=
27.31+70.90=
95.21g/mol
1) h2+o2 -> h2o
does equation 1 follow the law of conservation of mass? how can you tell?
Answer:
The given equation not following the law of conservation of mass.
Explanation:
H₂ + O₂ → H₂ O
The number of oxygen atoms on both side of equation are not equal thus mass is not conserved and this equation not follow the this law.
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
Explanation:
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
2H₂ + O₂ → 2H₂ O
there are two oxygen atoms and four hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.
What is the main reason that atoms lose or gain electrons to become ions?
Atoms that lose electrons acquire a positive charge as a result because they are left with fewer negatively charged electrons to balance the positive charges of the protons in the nucleus. Positively charged ions are called cations. Most metals become cations when they make ionic compounds.
what happen if added or removed energy a glass of ice water
Answer:
Changing states of matter and energy
A block of ice is solid water. When heat (a form of energy) is added, the ice melts into liquid water. ... Continue to cool the water (by removing heat), and it becomes solid ice. This is its freezing point.
2 questions Help need asap help thank you so 80 points and branliest random answers are reported plus deleted questions are in picture it’s for science retaking a test
explain why it is appropriate to group a polyatomic ion in parentheses in a chemical formula, if more than one of that ion is present in the formula
Answer:
See explanation
Explanation:
It is commonplace to put polyatomic ions in parenthesis when they are more than one in a compound. A typical example here is calcium phosphate- Ca3(PO4)2.
When a compound contains more than a single polyatomic ion of the same type,a parentheses is placed around the formula of that ion then a subscript is used to indicate how many of that particular ion are in the compound.
balanced equation for solid magnesium oxide
Answer:
Mg + O2 → MgO
Explanation:
2. Does sexual or asexual reproduction produces MORE diversity in offspring?
Answer:
sexual
Explanation:
During asexual reproduction, an organism splits into two separate organisms making them look the same.
An organism that was produced from sexual reproduction can have a number of combinations from both parent. For example if your mm had green eyes and your dad had brown eyes, you could either have brown, green, or hazel eyes. Or you could be a rare person that has one brown eye and one green eye... but like I said, that's rare in a person
Can someone please help me with this asap, it’s due today please help me
Answer:
lol I hate chemical but let me give some advice
Explanation:
Please go on Khan Academy or look at your notes and I promise you can figure out! Seriously, I am trying to be helpful not like the annoying teacher that says "figure it out"
why is a frozen Popsicle considered a homogeneous mixture
Answer:
It is a homogenious mixture because it has the same consistency throughout. It is just a frozen block of juice. Think about it. It also has the same substance throughout.
Explanation:
If a force of 1.4N is applied to a block with a mass of 7kg, what is the acceleration of the block in meters per second squared?
Answer:
0.2 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
f is the force
m is the mass
From the question we have
[tex]a = \frac{1.4}{7} = \frac{1}{5} \\ [/tex]
We have the final answer as
0.2 m/s²Hope this helps you
8,394m2 for 7kg with force 1.4
Calculate the number of bromide ions present in 3.5g of AgBr2
Answer:
There are 1.57 * 10²² bromide ions present in 3.5 g of AgBr₂
Explanation:
Equation for the ionization of silver bromide, AgBr2 is given below
AgBr₂ ----> Ag²⁺ + 2Br⁻
1 mole of AgBr2 produces 2 moles of bromide ions
molar mass of silver bromide 268 g/mol
molar mass of bromide ion 80 g/mol
number of moles in 3.5 g of AgBr₂ = mass/molar = 3.5 / 268 = 0.013 mole
0.013 moles of AgBr₂ will produce 2 * 0.013 moles of Br⁻ = 0.026 moles
One mole of a substance contains 6.02 * 10²³ particles. Therefore, one mole of bromide ions will contain 6.02 * 10²³ ions.
Number of ions present in 0.026 moles of bromide ions = 0.026 * 6.02 * 10²³ = 1.56 * 10²² ions.
Therefore, there are 1.57 * 10²² bromide ions present in 3.5 g of AgBr₂
FIRST ONE TO RESPOND CORRECTLY GET BRAINLESS
Answer:
sorry but we can't answer without the pic
Explanation:
Atoms acquire the stability of a noble gas by losing electrons
Answer:Atoms acquire the stable electron structure of a noble gas by losing electrons. An atom of an element in Group 1A has seven valence electrons. Among Group 1A and 2A elements, the group number is equal to the number of valence electrons in an atom of that element.
Explanation: Hope this help have an wonderful day and stay safe! :D
What is the mass in grams of 5.90 mol C3H18?
673 g
0.0512 g
19.4 g
389 g
3.55 x 1024
Answer:
319
Explanation:
The molecular mass of C3H18 can be found by adding up the molecular weights of carbon and hydrogen so, (12.01 x 3) For Carbon and (1.008x18) for hydrogen. You will find it is 54.174g/mol.
To find grams muliply g/mol by mols so 5.9 x 54.174= 319 i didnt see any errors with my math so maybe you clicked 8 by accident but i may just be wrong
hey i got a question for science its " you throw a rock with a mass of 3.6 kg. the ball leaves your hand with a speed of 10 m/s DO NOT INCLUDE J IN THE ANSWER
it is 3.9 i know tgis because you throw a rock with a mass of 3.6 kg. the ball leaves your hand with a speed of 10
What is a reduction reaction? O A. A reaction in which negatively charged particles are in the products B. A reaction in which charged particles form an ionic compound C. A reaction in which an atom has gained 1 or more electrons D. A reaction in which an atom forms a new isotope by gaining neutrons
Answer:
C
Explanation:
Reduction is a chemical reaction that involves the gaining of electrons by one of the atoms involved in the reaction between two chemicals. The term refers to the element that accepts electrons, as the oxidation state of the element that gains electrons is lowered.
What feature forms on the ocean floor at a divergent plate boundary where two pieces of oceanic crust are moving away from each other? One of these is found in the Atlantic Ocean. *
Mid-Ocean Ridge
Rift Valley
Trench
Glacier
Answer:
volcanos i think
Explanation:
learned it in 6th grade
Energy that is stored due to a shape is called
energy
pls fill in the blanks
65 POINTS ;))
Blank 1 :- Potential Energy
Blank 2 :- Kinetic Energy
Black 3 :- Potential Energy
Blank 4 :- Kinetic Energy
Blank 5 :- Kinetic Energy
Blank 6 :- Potential Energy
_____________________________________Part 2:1) Kinetic Energy
2) Potential Energy
3) Potential Energy
4) Kinetic Energy
5) Kinetic Energy
6) Kinetic and Potential Energy
7) Kinetic and Potential Energy
_____________________________________DEFINITIONS:_____________________________________Mechanical Energy:It is the type of energy possessed due to the motion or position. The objects do the work done by spending this energy. It is either Kinetic Energy or Potential Energy. It is also sometime referred as Total Energy.
Total Energy = Potential Energy + Kinetic Energy_____________________________________Kinetic Energy:The energy possessed by the object due to its motion.
K.E = [tex]\frac{1}{2}mV^2[/tex]_____________________________________Potential Energy:Energy Possessed or conserved by the object due to its height or position is Potential Energy.
P.E = mghwhere,
m is mass
g is acceleration due to gravity
h is height
_____________________________________Best Regards,'Borz'The label on a chemical in a science laboratory reads, “Strong Acid.” Based on this label, what can a student best determine about the chemical?
A. It has a low pH.
B. It is a clear liquid.
C. It has a high density.
D. It has a low melting point.
Answer:
A. It has a low pH
Explanation:
pH scale is 0 to 14 with 7 being neutral. Any thing below 7 is acidic Above 7 is a base or alkaline
Lower the pH the more careful you must be when handling the chemical. Strong Acid can do irreparable harm to eyes, skin, mucus membranes, eat holes in clothing etc. USE APPROPRIATE PPE
Below is pasted in definition you can look up in your textbook or online search.
pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.
The label of a strong acid is referring a chemical that has a low pH value. Therefore, option (A) is correct.
What are acids and bases?An acid can be defined as any substance that has the ability to donate a proton to another substance. A base has the capability to accept a hydrogen ion from an acid.
Acidic substances are recognized by their sour taste and can be energetically favorable after a loss of hydrogen H⁺ ion. Bases are recognized by a bitter taste and can dissolve in water.
When bases combine with acids, they form salts and water as products. Bases turn red litmus paper into blue while acids turn blue litmus into the red.
The pH value of the acids on the pH scale lies between 0 to 7 and the pH value of the bases on the pH scale lies between 7 to 14. Therefore, the given chemical is strong acid so it will have a low pH value.
Learn more about acids and bases, here:
brainly.com/question/3941445
#SPJ6
what is the density of a liquid is 67.1 mL of liquid weighs 55.221 g
Answer:
0.82 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question we have
[tex]density = \frac{55.221}{67.1} \\ = 0.822965...[/tex]
We have the final answer as
0.82 g/mLHope this helps you
3. What is an isotope?
Answer:
one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behaviour but with different atomic masses and physical properties
Explanation:
Answer:
what is an isotope? isotopes are versions of the same element. They have the same number of protons and electrons as the element but different mass numbers and number of neutrons.
Explanation:
hope this helps! :)
The total bonding energy for the products of a reaction is 2535 kJ/mol and the bonding energy of the reactants is 1375 kJ/mol. Calculate the change in enthalpy, and classify the reaction as endothermic or exothermic.
-1160 kJ/mol, endothermic
1160 kJ/mol, exothermic
-1160 kJ/mol, exothermic
1160 kJ/mol, endothermic
Answer:
-1160kj/mol
Explanation:
the reaction is exothermic because heat is released to the environment
How many moles of H3PO4 are contained in 150.0 mL of 18.1 M H3PO4?
Answer:
Number of moles = 2.72 mol
Explanation:
Given data:
Number of moles of H₃PO₄ present = ?
Molarity of solution = 18.1 M
Volume of solution = 150.0 mL (150/1000 = 0.15 L)
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
By putting values,
18.1 M = number of moles / 0.15 L
Number of miles = 18.1 M × 0.15 L
Number of moles = 2.72 mol
24 grams of iron is added to a graduated
cylinder containing 45 mL of water. The
water level rises to 48 ml. What is the
density of the iron?
Answer:
d = 8 g/mL
Explanation:
Given data:
Mass of metal = 24 g
Volume of eater = 45 mL
Volume of water + metal = 48 mL
Density of iron metal = ?
Solution:
Volume of metal:
Volume of metal = volume of water+ metal - volume of water
Volume of metal = 48 mL - 45 mL
Volume of metal = 3 mL
Density of metal:
d = m/v
d = 24 g/ 3 mL
d = 8 g/mL
True or False: Fungi can only reproduce asexually
Answer:
True
Explanation:
