CHEMISTRY HIGH SCHOOL

Write the number in scientific notation. 0.00069

Answers

Answer 1

Answer: 6.9 x 10^-4, in scientific notation this has 2 significant figures.

Answer 2

Answer:

Final answer:

The number 0.00069 in scientific notation is written as 6.9 × 10^-4.

Explanation:

To write the number 0.00069 in scientific notation, you need to consider scientific notation as a method of writing numbers as a product of a decimal number and a power of 10. By moving the decimal point four places to the right, 0.00069 becomes 6.9. The decimal point move four spaces to the right makes the power 10 to the negative 4, because the number becomes smaller. Therefore, 0.00069 can be written as 6.9 × 10-4 in scientific notation.

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In a nuclear reaction, the energy released is equal to 8.1 x 1016 joules. Calculate the mass lost in this reaction. (1 J = 1 kg m2/s2) and the speed of light = 3.00 × 10^8 m/s ]Answer 7.2 x 1032 kg 2.7 x 108 kg 9.0 x 10-1 kg 7.2 x 10-16 kg

How many grams of O2(g) are needed to completely burn 73.7 g of C3H8(g)?

Answers

The balanced reaction is:

C3H8 + 5O2 = 3CO2 + 4H2O

We are given the amount of C3H8 to be reacted with O2. This will be the starting point of the calculations.

73.7 g C3H8 ( 1 mol C3H8/ 44.1 g C3H8 ) ( 5 mol O2 / 1 mol C3H8 ) ( 32.0 g O2 / 1 mol O2 ) = 267.39 g O2

Answer: 267.2 grams

Explanation:

$C_3H_8+5O_2\rightarrow 3CO_2+4H_2O$

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

$\text{Number of moles of propane}=(73.7g)/(44.1g/mol)=1.67moles$

According to stoichiometry:

1 mole of $C_3H_8$ require 5 moles of $O_2$

Thus 1.67 moles of $C_3H_8$ will require = $(5)/(1)* 1.67=8.35moles$ of $O_2$

Mass of $O_2=moles* {\text {Molar mass}}=8.35moles* 32g/mol=267.2$

Thus 267.2 grams of oxygen are required.

Which of the following is a producer? A.a crow that consumes a dead animal on the side of a road

B.a fish that eats smaller fish for its food

C.a giraffe that eats the leaves of trees

D.a plant that has insect larvae feeding on its roots

Answers

D. a plant that has insect larvae feeding on its roots.

a sample of ammonia contains 9g hydrogen and 42g nitrogen. another sample contains 5g hydrogen .calculate the amount of nitrogen in the second sample

Answers

Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. Therefore, the amount of nitrogen in the second sample is 23.3g.

What is mass?

Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.

Average atomic mass = (mass of first isotope× percent abundance of first isotope)+(mass of second isotope× percent abundance of second isotope)

9 g of hydrogen - 42 g of nitrogen

5 g of hydrogen - x g of nitrogen

9x= 42 ×5

x=23.3g

Therefore, the amount of nitrogen in the second sample is 23.3g.

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9 g of hydrogen - 42 g of nitrogen
5 g of hydrogen - x g of nitrogen

$9x=42 \cdot 5 \n9x=210 \nx \approx 23.33$

The mass of nitrogen in the second sample is 23.33 g.

Based on the Periodic Table, explain why Na and Khave similar chemical properties

Answers

The Group 1 elements, which include lithium (Li), sodium (Na) and potassium (K) are also known as the alkali metals. They all have one electron in the outer shell and so they have similar properties.

What is the nitrogen cycle?

Answers

Nitrogen cycle is the series of processess where nitrogen and its compound move through the environment and in living organisms. The processes here include fixation, ammonification, nitrification and denitrification. Majority of Earth's atmosphere is nitrogen.

Two examples of silicate minerals are

Answers

look it up on google that’s how i get my answers :)

Answer:

who know

Explanation:

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