1. Identify the reactants and the products in the following equation. (1 point)
CaO + CO2 → CaCO3
2. Show the molecular formula and electron structure of the simplest compound that forms with only carbon and hydrogen atoms. (1 point)
3. For each equation, state the reaction type and then balance the equation. (2 points)
a. ___Na3PO4 + ___HCl → ___H3PO4 + ___NaCl
b. ___KClO3 → ___KCl + ___O2
4. You have knowledge of the outermost electron states of the atoms, trends in the periodic table, and the patterns of chemical properties. Use that knowledge to predict the products of each of the following equations. Then explain how you made your predictions. Be sure to balance the equations. (4 points)
a. ___NaBr + ___Ca → _______ + _______
b. ___Mg + ___O2 → _______
5. Identify the products of this single-replacement reaction between sulfuric acid and aluminum. Then balance the equation. (2 points)
___H2SO4 + ___Al → ___ + ___
6. (6 points)
a. Write a balanced equation for the model of a chemical reaction shown below. (The white balls represent hydrogen atoms, the black balls represent carbon atoms, and the gray balls represent oxygen atoms.) Then complete the table with information about the atoms and molecules represented in the model. Show your work. (5 points)
chemical equation
Molecule name Methane Oxygen Water Carbon dioxide
Molecular formula
H2O
Elements in molecule
C, O
Molecular mass of molecule 16.05 g/mol
Total mass in reaction
64.00 g
Total mass of all reactant molecules
Total number of reactant atoms
Total mass of product molecules
Total number of product atoms
b. How does your second table support the claim that the number of atoms — and therefore mass — is conserved during a chemical reaction? (1 point)
7. (6 points)
a. Calculate the molar mass of sucrose: C12H22O11. Show your work. (2 points)
b. Calculate the molar mass of glucose, one of the products of photosynthesis: C6H12O6. Show your work. (2 points)
c. How many molecules are in 1 mole of sucrose? (1 point)
d. How many atoms are in 1 mole of sucrose? (1 point)
8. Baking soda (NaHCO3) and vinegar (HC2H3O2) react to form sodium acetate, water, and carbon dioxide. If 42.00 g of baking soda react, how many moles of carbon dioxide will form? Show your work. (3 points)
NaHCO3 + HC2H3O2 → NaC2H3O2 + H2O + CO2
Answers
The series of questions is based on the entire concept of chemical equations. This is shown by balanced reaction equations.
What is a reaction equation?A reaction equation shows the reactants and the products in a reaction. We shall now answer the questions individually;
1) The reactants in this equation are CaO and CO2. The product is CaCO3.
2) The simplest molecule that is formed between carbon and hydrogen is CH4 with the structure shown in the image attached.
3) The balanced equations are;
a) Na3PO4 + 3HCl -----> H3PO4 + 3NaCl
b) 2KClO3 → 2KCl + 3O2
4)
a. 2NaBr + Ca ----->CaBr2 + 2Na
b. 2Mg + O2 ------->2MgO
5) 3H2SO4 + 2Al -------> Al2(SO4)3 + 3H2
6) CH4 + 202 ---->CO2 + 2H2O
7)
a. molar mass of sucrose = 12(12) + 22(1) + 11(16) = 144 + 22 + 176 = 342 g/mol
b. molar mass of glucose = 6(12) + 12(1) + 6(16) = 72 + 12 + 96 = 180 g/mol
c. There are 6 * 10^23 molecules 1 mole of sucrose
d. There are 6 * 10^23 atoms 1 mole of sucrose
8) The equation of the reaction is; NaHCO3 + HC2H3O2 → NaC2H3O2 + H2O + CO2
Number of moles of baking soda= 42.00 g/84 g/mol = 0.5 moles
Since the reaction is 1:1, 0.5 moles of CO2 is formed.
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Related Questions
using law of indices
Answers
Answer:
1
Step-by-step explanation:
There are a couple of identities that come into play here:
a³ -b³ = (a -b)(a² +ab +b²)
(x^a)/(x^b) = x^(a-b)
(x^a)^b = x^(ab)
(x^a)(x^b) = x^(a+b)
_____
These mean we can simplify the expression as follows.
[tex]\left(\dfrac{x^{a}}{x^{b}}\right)^{a^2+ab+b^2}\times\left(\dfrac{x^{b}}{x^{c}}\right)^{b^2+bc+c^2}\times\left(\dfrac{x^{c}}{x^{a}}\right)^{c^2+ca+a^2}\\\\=x^{(a-b)(a^2+ab+b^2)}\times x^{(b-c)(b^2+bc+c^2)}\times x^{(c-a)(c^2+ca+a^2)}\\\\=x^{a^3-b^3}\times x^{b^3-c^3}\times x^{c^3-a^3}=x^{(a^3+b^3+c^3)-(a^3+b^3+c^3)}\\\\=x^0=\boxed{1}[/tex]
The expression has a value of 1.
__
Additional comment
For certain values of x and the exponents, the individual factors may exceed the ability of a calculator to express the value. That is, an attempt at numerical evaluation of this may produce a result different from 1. In any event, the expression is undefined for x=0.
Region R is bounded by the curves y = 4x^2 and y = 4. A solid has base R, and cross sections perpendicular to the y-axis are semicircles with the diameter lying in R. The volume of this solid is
A. pi/4
B. pi/2
C. pi
D. 2pi
Answers
Each cross section has a diameter equal the horizontal distance between the two "halves" of the parabola. We have
y = 4x² ⇒ x = ±√y/2
so the diameter for some given y would be √y/2 - (-√y/2) = √y.
The volume of a cross section with thickness ∆y is then
π/2 (√y/2)² ∆y = π/8 y ∆y
The total volume of the solid would then be
[tex]\displaystyle \int_0^4 \frac\pi8 y \, dy = \frac\pi8 \times \frac12 y^2 \bigg|_{y=0}^{y=4} = \boxed{\pi}[/tex]
2.) If ZA = (20 – 2m)º and ZD = (m – 130°, what is the value of m?
Answers
Answer:
m = 50
Step-by-step explanation:
∠ D and ∠ A are vertically opposite angles and are congruent , then
m - 130 = 20 - 2m ( add 2m to both sides )
3m - 130 = 20 ( add 130 to both sides )
3m = 150 ( divide both sides by 3 )
m = 50
nidarians include all of the following EXCEPT:
A. snails
B. jellyfish
C. sea anemone
Answers
The point (-1,4)is translated five units right and three units down.which rule describes the translation
Answers
Answer:
(x, y ) → (x + 5, y - 3 )
Step-by-step explanation:
5 units right means add 5 to the x- coordinate
3 units down means subtract 3 from the y- coordinate
the translation rule is
(x, y ) → (x + 5, y - 3 )
Hello, I need help with sample dpace
Answers
Answer:1/2 problability for both odd and same for evens.1/8 chance of spinning a 3 .25% chance of a 4 or 6.one eight of a chance of spinning a 7 or 1.part 2. a is false because the chance of spinning and odd is 50% and their is 3 numbers less than 4 .4 numbers would be a 50% chance to buts its not.b is true because he has a chance of spinning any number i think.c is true because there are 4 odd numers and 2 and 4 is half of 4
Step-by-step explanation:
What is the greatest common factor of 12xy^5 + 60x^4y^2 – 24x^3y^3??
О6xy^2
о6xy^5
o12xy^2
o3x^4y^5
Answers
Answer:
The greatest common factor of 12xy^5 + 60x^4y^2 – 24x^3y^3 is 12xy²
A segment 150 units long is divided into 3 parts in the ratio 2:3:5. How long is the shortest part?
Answers
15 x 2=30
Your answer is 30.
Estimate the perimeter and the area of the shaded figure.
A shaded composite figure is shown on a grid. The figure is made up of an isosceles triangle and an isosceles trapezoid. The triangle has a base of 6 units and height of 3 units. The trapezoid has a shorter base of 4 units, longer base of 6 units, and height of 3 units. The longer base of the trapezoid is aligned with the base of the triangle.
perimeter: about
units
area: about
square units
Answers
The shapes in the composite figures are a triangle and a trapezoid
The area of the figure is about 24 square units
The area of the figureThe dimensions of the figure are given as:
Triangle
Base = 6 unitsHeight = 3 unitsTrapezoid
Shorter base = 4 unitsLonger base = 6 unitsHeight = 3 unitsThe longer base of the trapezoid and the base of the triangle are aligned.
So, the area is:
Area = Area of triangle + Area of trapezoid
This gives
Area = 0.5 * base * height + 0.5 * (sum of bases) * height
So, we have:
Area = 0.5 * 6 * 3 + 0.5 * (4 + 6) * 3
Evaluate
Area = 24
The figure is needed to determine the perimeter
Hence, the area of the figure is about 24 square units
Read more about composite figures at:
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Answer:
47.3
Step-by-step explanation:
yes
can i have help? (picture included)
Which statement about standard error is false?
O A. It is a measure of the variability of a statistic.
O B. It can be calculated using either the population or sample
standard deviation.
O C. It can be calculated as a
n
O D. It is an estimate of the standard deviation of a sampling
distribution.
Answers
Answer:
I'm pretty sure it's C.
Step-by-step explanation:
answer this for 25 points and brainliest
Answers
Answer:
B
Step-by-step explanation:
For percentage, you take the percent symbol and move it two spaces to the left and make it a decimal, hence the .32 and then you multiply it by the integer you want to find the percent of, 130.
Answer:
0.32 x 130
Step-by-step explanation:
A percentage is out of 100;
32% = 32/100
32/100 = 0.32
32% of 130 is a multiplication problem (of : multiplication).
0.32 x 130 = 41.6
Help me please this is due in 30 mins!
The perimeter of a square is 68 feet. What is the length of one of its sides? Explain your work.
Answers
Answer:
17 feet
Step-by-step explanation:
Since a square has 4 sides, you have to do 68 / 4 to find one of the sides.
68/4 = 17
And to check, if you add up all sides...
17+17+17+17 = 68
Four racers are racing on a track.
Raheem covers 26% of the track, Lila covers 38 of the track, Khalid covers 0. 3 of the track, and Juanita covers 0. 24 of the track.
List the people in order by the distance on the track each person covers from least to greatest
Answers
Christopher determines the system of s(x) and t(x) has only one solution.Which system is Christopher solving?
Answers
Christopher is solving a system of equations that has one solution and can be seen in Option C.
What is a system of equations?A system of equations is more than one equation that can be solved together to get a unique solution. In this situation, the power of the equation must be in one degree.
A quadratic equation is an algebraic equation whose power is raised to the second degree.
However, if their power is not in one degree, they are regarded as a quadratic equation and it usually produces two solutions.
From the given options, we can see that only option c is not a quadratic equation, Hence, it is the right answer.
Learn more about systems of equations here;
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This graph plots the number of wins last year and this year for a sample of professional football teams.
Based on the line of best fit, which is the BEST prediction for wins this year for a team that won 4 games last year?
A. 2
B. 4
C. 5
D. 7
Answers
Answer:
C.5, Because when you you add the line of best fit on the graph it goes through the 5 point right over 4 wins won last year.
Find five rational numbers between -3/5 and 5/3
Answers
Answer:
-8/15, -2/15, 1/5, 4/15 and 2/3.
Step-by-step explanation:
-3/5 = -9/15 and 5/3 = 25/15
So 5 rational numbers between these 2 values
= -8/15, -2/15, 3/15, 4/15 and 10/15
= -8/15, -2/15, 1/5, 4/15 and 2/3.
Please help with algebra
In how many ways could you choose 3 side dishes from a menu that offers 5 vegetable side dishes
and 3 starches if you want at least one vegetable and one starch?
Answers
Using the Fundamental Counting Theorem, it is found that there are 90 ways to choose the three side dishes.
What is the Fundamental Counting Theorem?It is a theorem that states that if there are n things, each with [tex]n_1, n_2, \cdots, n_n[/tex] ways to be done, each thing independent of the other, the number of ways they can be done is:
[tex]N = n_1 \times n_2 \times \cdots \times n_n[/tex]
In this problem:
For the vegetable, there are 5 options, hence [tex]n_1 = 5[/tex].For the starch, there are 3 options, hence [tex]n_2 = 3[/tex].The remaining dish is free, which means that there are 5 + 3 - 2 = 6 options, hence [tex]n_3 = 6[/tex].Then:
N = 5 x 3 x 6 = 90.
There are 90 ways to choose the three side dishes.
More can be learned about the Fundamental Counting Theorem at https://brainly.com/question/24314866
Sharon buys a bracelet for $12 plus a 6% tax. What is the total cost for Sharon?
Answers
Because the 6% of 12 is 72
The circumference of a circle is 19π cm. Find its diameter, in centimeters.
Answers
Answer:
d = 19 cm
Step-by-step explanation:
Circumference of circle = πd
πd = 19π
d = 19π ÷ π
d = 19 cm
d=19 cm
Solution:Circumference=C=πdπ=3.14d= diameterWe are given the circumference, in terms of pi:C=19πC=πdTherefore, the diameter is equivalent to 19.Hope it helps.
Do comment if you have any query.
Solve -6x + 18 > -30
A. x < 2
B. x < 8
C. x > 8
D. x > 2
Answers
Answer: x < 8
P/s: if -1.x > -a => x < -a/-1
Ok done. Thank to me >:3
[tex] - 6x \: + \: 18 \: > \: - 30[/tex]
We move the term "+18" to clear the unknown of the inequality.[tex] - 6x \: > \: - 30 \: - \: 18[/tex]
We calculate the remainder.[tex] - 6x \: > \: - 48[/tex]
We divide both sides of the inequality by "-6" to solve for the unknown.[tex] \boxed{x \: < \: 8}[/tex]
Answer:[tex] \text{D.} \: \boxed{ \bold{x \: < \: 8}}[/tex]
MissSpanishBased on the figure, which of the following statements
CANNOT be proven?
Answers
Answer:
the final one
Step-by-step explanation:
to figure this equation out it is easier to add numbers to the angles
for 1 we can have it as 100 and for 2 we can have it as 80
that means 3 is 100 and 4 is 80
100 - 80 is also 100 - 80 so the first one can be proven
100 + 80 = 180 so the second one can be proven
80 = 80 so the third one can be proven
80 + 80 = 100 + 100 is not correct because it turns into 160 = 200 which is incorrect so the last one cannot be proven
Answer:
4th option : m∠1 + m∠3 = m∠2 + m∠4Step-by-step explanation:
By VOA theorem, vertically opposite angles are equal.
∠1 = ∠3∠2 = ∠4⇒ You can write : ∠1 + ∠2 = ∠3 + ∠4
⇒ or ∠4 - ∠1 = ∠3 - ∠2
⇒ The 4th option does not give it correctly
Use x = 2 to identify the value of each expression.
Exponent Value of expression
25
32
82
16
64
Answers
Answer:
25/2 = 12.5 32/2= 16 82/2= 41 16/2=8 64/2= 32
Step-by-step explanation:
If corect please give branlieist
PLSSSSSSSSS I REALLY NEED HELP DO I PUT A RAY HERE
Answers
GIVE AWAY PLEASE TAKE IT
Answers
Answer:
I guess, as long as this is an act of kindness. Thanks?
Answer:
x=7
Step-by-step explanation:
Solution of your latest question
because i can't get any answer option there ....so posting it heree .....
hope you get it before it got deleted
What statistical technique should be used when testing for differences in the number of athletes and non-athletes in a college population
Answers
Answer:Chi-square is a nonparametric statistical procedure for nominal data.
Step-by-step explanation:
4. Prove that the two figures in the graph below are similar.
Answers
Step-by-step explanation:
The resting heart rate for a pig is about 100 beats per
minute.
A pig's resting heart rate is about 75 beats per minute
higher than an elephant's resting heart rate.
What is an elephants resting heart rate? Choose the correct equation and
answer.
O A. X+75 = 100
x = 25 beats per minute
O B. X+175 = 100
x= 75 beats per minute
O C. x+100 = 75
x = 175 beats per minute
O D. x+75 = 100
x= 175 beats per minute
Answers
Answer:
a
Step-by-step explanation:
pigs are 75 bpm more than elephants
so elephants are x + 75
and pigs are 100 bpm
so this means your answer is a
What is the measure of ∠E, rounded to the nearest degree?
28°
36°
54°
80°
Answers
Answer:
```30.
<30`
<98
<`36ok this is your answer....
2(4y-9)=14 solve for y
Answers
Answer:
y = 4
Step-by-step explanation:
2(4y - 9) = 14
8y - 18 = 14
8y = 32
y = 4
Answer:
y = 4
Step-by-step explanation:
Simplifying
2[4y + -9] = 14
Reorder the terms:
2[-9 + 4y] = 14
[-9 * 2 + 4y * 2] = 14
[-18 + 8y] = 14
Solving
-18 + 8y = 14
Solving for variable 'y'.
Move all terms containing y to the left, all other terms to the right.
Add '18' to each side of the equation.
-18 + 18 + 8y = 14 + 18
Combine like terms: -18 + 18 = 0
0 + 8y = 14 + 18
8y = 14 + 18
Combine like terms: 14 + 18 = 32
8y = 32
Divide each side by '8'.
y = 4
If (x - 3) 2 = 5, then
need help asap pleaseeeee
Answers
Answer:
x = 3 ± [tex]\sqrt{5}[/tex]
Step-by-step explanation:
(x - 3)² = 5 ( take square root of both sides )
x - 3 = ± [tex]\sqrt{5}[/tex] ( add 3 to both sides )
x = 3 ± [tex]\sqrt{5}[/tex]
Answer:
×=5.5
Step-by-step explanation:
exact form would be 11/5
and mixed form is 5 1/2