Write this number in standard notation.
1.986 x 10negative exponent 6 or 1.986 x 10^6
Answers
Answer:
Explanation:
We have the number . Standard notation would basically be this number without the
part.
To get rid of this part, we need to move the decimal point 6 places to the left (we go left because it's negative 6, indicating division).
So, when we move the decimal point 6 places to the left, the resulting number is: , with 5 zeros after the decimal point before a nonzero number.
Thus, the answer is .
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Which part of the immune system is produced in the bone marrow and circulates through the blood to destroy germs? A. red blood cells B. white blood cells C. lymphocytes D. fibrin
Name the 5 types of chemical reactions
B. 39 protons, 30 neutrons, 30 neutrons
C. 39 protons, 30 neutrons, 39 electrons
D. 30 protons, 39, neutrons, 30 electrons
Answers
Answer:
D. 30 protons, 39 neutrons, 30 electrons
Explanation:
The atomic number (Z) is the number of protons (p) in the nucleus. Since
Z = 30, p = 30.
In a neutral atom, the number of electrons (e) equals the number of protons. Since p = 30, e = 30.
The mass number (A) is the number of protons plus the number of neutrons (n).
A = p + n
For an atom of zinc-69,
69 = 30 + n Subtract 30 from each side and transpose
n = 39
Zinc has the chemical symbol Zn and the atomic number 30. D. 30 protons, 39, neutrons, 30 electrons
What is Zinc
Zinc has the chemical symbol Zn, and its atomic number is 30. This means that every atom of zinc contains 30 protons in its nucleus.
An atom of zinc-69 (Zn-69) is one that contains:
- 30 protons (since zinc has an atomic number of 30).
- 39 neutrons (subtract the atomic number from the mass number: 69 - 30 = 39).
- 30 electrons (in a neutral atom, the number of electrons is equal to the number of protons).
So, the correct option is option d 30 protons, 39 neutrons, 30 electrons.
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lines the mucus membrane
increases blood flow
keeps the brain dry and warm
Answers
Answers
Answer:
hmhmhmhm
Explanation:
force
speed
position
Answers
Answer:
Velocity
Explanation:
The change of velocity rate it's the definition of acceleration.
While increasing or decreasing velocity, it means that an acceleration it's happening.
Using some math:
This can be read as "the acceleration it's equal to te variation of velocity with respect to time"
O
A. A scientist should form a hypothesis, then conduct an experiment.
O
B. A scientist should draw conclusions, then form a hypothesis.
O
C. A scientist should conduct an experiment, then state the question.
D. A scientist should collect data, then state the question.
Answers
A scientist should form a hypothesis, then conduct an experiment describes the correct order for using the scientific method. Thus option A is correct.
What is scientific method ?
Scientific method can be defined as to answer the question, a continuous experiment, investigation which are applied in a scientific method, includes measurable observation, develop experiment and improve a hypothesis and formulate phenomenon.
The different steps of Scientific method are involve in Making an Observation is involved the different steps like inspection, conducting the investigation by asking questions.
Asking Questions most important step and it is used to make sure that every details are known and the query can be solved quickly.
To construct the Hypothesis, it involves proper explanation of the query and it is most significant part of the scientific method.
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Answer:
A
Explanation:
Answers
Hey there!
Given the reaction:
P4 + 10 Cl2 ------------------ 4 PCl5
Molar mass P4 = 124 g/mol
Number of moles P4:
n = mass of solute / molar mass
n = 24.0 / 124
n = 0.1935 moles of P4
Therefore:
1 mole P4 --------------- 4 moles PCl5
0.1935 moles P4 ------- moles PCl5
moles PCl5 = 0.1935 * 4
= 0.774 moles of PCl5
Hope that helps!